TRANE SWUD Commercial Self Contained Units Instruction Manual

Instruction Manual for TRANE models including: SWUD Commercial Self Contained Units, SWUD, Commercial Self Contained Units, Self Contained Units, Contained Units, Units

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Commercial Self-Contained Units SWUD

2024-05-25 — Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, ...

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PKG-SVX029A-EN 05252024

Installation, Operation, and Maintenance
Commercial Self-Contained Units SWUD
R-454B 20 to 110 Tons

SWUD 20 to 110 Tons

SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

May 2024

PKG-SVX029A-EN

Introduction

Read this manual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as required. Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

The three types of advisories are defined as follows:

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION NOTICE

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.
Indicates a situation that could result in equipment or property-damage only accidents.

Important Environmental Concerns
Scientific research has shown that certain man-made chemicals can affect the earth's naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants.
Important Responsible Refrigerant Practices
Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified according to local rules. For the USA, the Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WARNING
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.
WARNING
Personal Protective Equipment (PPE) Required!
Failure to wear proper PPE for the job being undertaken could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the instructions below:
· Before installing/servicing this unit, technicians MUST put on all PPE required for the work being undertaken (Examples; cut resistant gloves/ sleeves, butyl gloves, safety glasses, hard hat/ bump cap, fall protection, electrical PPE and arc flash clothing). ALWAYS refer to appropriate Safety Data Sheets (SDS) and OSHA guidelines for proper PPE.
· When working with or around hazardous chemicals, ALWAYS refer to the appropriate SDS and OSHA/GHS (Global Harmonized System of Classification and Labelling of Chemicals) guidelines for information on allowable personal exposure levels, proper respiratory protection and handling instructions.
· If there is a risk of energized electrical contact, arc, or flash, technicians MUST put on all PPE in accordance with OSHA, NFPA 70E, or other country-specific requirements for arc flash protection, PRIOR to servicing the unit. NEVER PERFORM ANY SWITCHING, DISCONNECTING, OR VOLTAGE TESTING WITHOUT PROPER ELECTRICAL PPE AND ARC FLASH CLOTHING. ENSURE ELECTRICAL METERS AND EQUIPMENT ARE PROPERLY RATED FOR INTENDED VOLTAGE.

PKG-SVX029A-EN

WARNING
Follow EHS Policies!
Failure to follow instructions below could result in death or serious injury.
· All Trane personnel must follow the company's Environmental, Health and Safety (EHS) policies when performing work such as hot work, electrical, fall protection, lockout/tagout, refrigerant handling, etc. Where local regulations are more stringent than these policies, those regulations supersede these policies.
· Non-Trane personnel should always follow local regulations.
WARNING
R-454B Flammable A2L Refrigerant!
Failure to use proper equipment or components as described below could result in equipment failure, and possibly fire, which could result in death, serious injury, or equipment damage. The equipment described in this manual uses R-454B refrigerant which is flammable (A2L). Use ONLY R454B rated service equipment and components. For specific handling concerns with R-454B, contact your local representative.

Introduction
Copyright
This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.
Trademarks
All trademarks referenced in this document are the trademarks of their respective owners.
Agency Listing
Unit is listed with ETL as a modular/cassette product and ships as such. Individual assemblies are tested and meet the requirements as such, but is not tested as a completed unit. Important: Installer is responsible for proper installation
and for properly following assembly instructions found in this IOM.

PKG-SVX029A-EN

Table of Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
R-454B Compressors . . . . . . . . . . . . . . . . . . . . . . 7
SWUD Components . . . . . . . . . . . . . . . . . . . . . . . 7 Standard Controls. . . . . . . . . . . . . . . . . . . . . . 7 TD-7 Touch Screen Display. . . . . . . . . . . . . . 7 Symbio 500 Unit Controller . . . . . . . . . . . . . . 7 Optional Controls . . . . . . . . . . . . . . . . . . . . . . 7 Unit Nameplate . . . . . . . . . . . . . . . . . . . . . . . . 8
Model Number Description . . . . . . . . . . . . . . . . . . . 9
General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Receiving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Receiving Checklist . . . . . . . . . . . . . . . . . . . 12 Ship-Separate Accessories. . . . . . . . . . . . . 12 Contractor Installation Responsibilities . . . . . . . . . . . . . . . . . . . . . . . 12 Unit Inspection. . . . . . . . . . . . . . . . . . . . . . . . 12 Exterior Inspection . . . . . . . . . . . . . . . . . . . . 12 Inspection for Concealed Damage. . . . . . . 12 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Dimensional Data. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Service Clearances . . . . . . . . . . . . . . . . . . . . . . . 17
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installation Mechanical . . . . . . . . . . . . . . . . . . . . 19
Unit Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installation Preparation . . . . . . . . . . . . . . . . . . . . 20
Unit Vibration Isolator Option . . . . . . . . . . . . . . . 20
Unit Isolator Installation Procedure . . . . . . . . . . 20
Duct Connections. . . . . . . . . . . . . . . . . . . . . . . . . 20
Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Condenser Connections . . . . . . . . . . . . . . . 21 Condensate Drain Connections . . . . . . . . . 21 General Waterside Recommendations for Cooling Towers . . . . . . . . . . . . . . . . . . . . 22 Waterside Piping Arrangements. . . . . . . . . 22 Water Temperature Requirements . . . . . . . 22 Water Piping Verification . . . . . . . . . . . . . . . 22
Installating the Hydronic Coil . . . . . . . . . . . . . . . 22 Refrigerant System. . . . . . . . . . . . . . . . . . . . 22

Installation - Electrical. . . . . . . . . . . . . . . . . . . . . . . 23
Unit Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . 23
Supply Power Wiring . . . . . . . . . . . . . . . . . . . . . . 23 Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . 23 Voltage Imbalance . . . . . . . . . . . . . . . . . . . . 23 Phase Monitor . . . . . . . . . . . . . . . . . . . . . . . . 23 Control Power . . . . . . . . . . . . . . . . . . . . . . . . 23
Selection Procedures . . . . . . . . . . . . . . . . . . . . . 24 Determine Minimum Circuit Ampacity (MCA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Static Pressure Transducer Installation (VAV Units Only). . . . . . . . . . . . . . . . . . . . . . . . . . 25
Transducer Inlet Location . . . . . . . . . . . . . . 25 Installing the Transducer . . . . . . . . . . . . . . . 25
Zone Sensor Option used for Discharge Air Reset by Space Temperature. . . . . . . . . . . . . . . 26
Zone Temperature Sensor, BAYSENS077 (Optional Item) . . . . . . . . . . 26
Zone Sensor Installation . . . . . . . . . . . . . . . . . . . 26 Mounting Location . . . . . . . . . . . . . . . . . . . . 26 Mounting the Subbase . . . . . . . . . . . . . . . . . 26 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Standard Remote Sensor (BAYSENS077) . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Principles . . . . . . . . . . . . . . . . . . . . . . . . 28
Control Sequences of Operation . . . . . . . . . . . . 28 Occupied/Unoccupied Switching . . . . . . . . 28 Compressor Lead/Lag . . . . . . . . . . . . . . . . . 28 Emergency Stop Input . . . . . . . . . . . . . . . . . 28 External Auto/Stop Input . . . . . . . . . . . . . . . 28 Local Auto Stop. . . . . . . . . . . . . . . . . . . . . . . 28 Head Pressure Control . . . . . . . . . . . . . . . . 28 Water Purge. . . . . . . . . . . . . . . . . . . . . . . . . . 28
Supply Air Temperature Control Unit Sequence of Operation . . . . . . . . . . . . . . . . . . . . 28
Discharge Air High Temp Limit Software Alarm (Software) . . . . . . . . . . . . . 28 Condenser Water Low Temperature Alarm (Software) . . . . . . . . . . . . . . . . . . . . . . 28 Leaving Air Low Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Occupied Fan Operation . . . . . . . . . . . . . . . 28 Heat/Cool Mode . . . . . . . . . . . . . . . . . . . . . . 28 Cooling/Waterside Economizer . . . . . . . . . 29

PKG-SVX029A-EN

Table of Contents

Thermostatic Expansion Valve. . . . . . . . . . . . . . 29
Fan Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Supply Air Static Pressure High Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . 29 High Pressure Cutout Switch (HPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Compressor Pressure Sensors . . . . . . . . . 29 Compressor Suction Temperature . . . . . . . 30 Fixed Speed Compressor (FS) . . . . . . . . . . 30 Compressor Safety Circuit . . . . . . . . . . . . . 30 Compressor Limit Conditions . . . . . . . . . . . 30 Compressor Staging. . . . . . . . . . . . . . . . . . . 31 Compressor Control . . . . . . . . . . . . . . . . . . . 31
Waterside Components. . . . . . . . . . . . . . . . . . . . 31 Water Purge. . . . . . . . . . . . . . . . . . . . . . . . . . 31 Water Piping Options . . . . . . . . . . . . . . . . . . 31 Water Flow Switch Option . . . . . . . . . . . . . . 31 Water-Cooled Condensers . . . . . . . . . . . . . 31 Waterside Economizer Option . . . . . . . . . . 32 Heat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Dirty Air Filter Sensor Option . . . . . . . . . . . 32 Supply Air Static Pressure High Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Airside Components . . . . . . . . . . . . . . . . . . . . . . 32 Two-Position Damper Interface . . . . . . . . . 32 Airside Economizer Interface with OA Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Airside Economizer Interface with Comparative Enthalpy . . . . . . . . . . . . . . . . . 32
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Unit Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Navigating the TD-7. . . . . . . . . . . . . . . . . . . . . . . 37 TD-7 Home Screen. . . . . . . . . . . . . . . . . . . . 37
TD-7 Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Unit Status Report . . . . . . . . . . . . . . . . . . . . 37 All Points Report . . . . . . . . . . . . . . . . . . . . . . 37
Starting the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Local Auto/Stop Value . . . . . . . . . . . . . . . . . 37 Setpoint Adjustments . . . . . . . . . . . . . . . . . . 38
Unit Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Unit Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Compressor Alarms . . . . . . . . . . . . . . . . . . . 39 Fan Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . 39 General Alarms . . . . . . . . . . . . . . . . . . . . . . . 40
Water Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Pre-Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Pre-Startup Checklist . . . . . . . . . . . . . . . . . . . . . 41
Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Water-Cooled Unit Piping . . . . . . . . . . . . . . . . . . 41
Units with Hydronic Heat. . . . . . . . . . . . . . . . . . . 41
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Final Refrigerant Charge. . . . . . . . . . . . . . . . . . . 42
Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . 42 Operating and Programming Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Start-Up Log . . . . . . . . . . . . . . . . . . . . . . . . . 43
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Inspecting and Cleaning the Drain Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Scroll Compressor Failure Diagnosis and Replacement . . . . . . . . . . . . . . . . . . . . . 45
Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . 45 Refrigerant Leak Test Procedure . . . . . . . . 45 Brazing Procedures . . . . . . . . . . . . . . . . . . . 46 System Evacuation Procedures . . . . . . . . . 46
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Scroll Compressor Failure Diagnosis and Replacement . . . . . . . . . . . . . . . . . . . . . 48
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Cleaning Coil Fin. . . . . . . . . . . . . . . . . . . . . . 48
Piping Components . . . . . . . . . . . . . . . . . . . . . . . 50 Water Valves . . . . . . . . . . . . . . . . . . . . . . . . . 50 Water Flow Switch . . . . . . . . . . . . . . . . . . . . 50
Maintenance Periodic Checklists. . . . . . . . . . . . 50

PKG-SVX029A-EN

Table of Contents

Monthly Checklist . . . . . . . . . . . . . . . . . . . . . 50 Semi-Annual Maintenance . . . . . . . . . . . . . 51 Annual Maintenance. . . . . . . . . . . . . . . . . . . 51
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 52 System Checks . . . . . . . . . . . . . . . . . . . . . . . 52

PKG-SVX029A-EN

Overview
Note: One copy of this document ships inside the control panel of each unit and is customer property. It must be retained by the unit maintenance personnel.
This manual describes proper installation, operation, and maintenance procedures for water cooled systems. By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component damage will be minimized. It is important that periodic maintenance be performed to help support trouble free operation. A maintenance schedule is provided at the end of this manual. Should equipment failure occur, contact a qualified service organization with qualified, experienced HVAC technicians to properly diagnose and repair this equipment.
R-454B Compressors
· Use crankcase heaters which must be energized 24 hours prior to compressor start. Note: This unit is equipped with stator heating capabilities that eliminates the need for a crankcase heater on the variable speed compressor only. All fixed speeds must utilize a crankcase heater.
· Contains POE oil which readily absorbs potentially damaging moisture from air.
· Control box includes a phase monitor to detect phase loss, line voltage imbalance, and reversal.
SWUD Components
SWUDs are complete HVAC systems used in floor-by-floor applications.
· A single piece cabinet design to target new constructions.
· Left hand power connections.
· Left or right hand water connections.
· Factory installed options.
The hermetically sealed scroll compressor motors utilize internal motor protection and time delays to prevent excessive cycling.
Units utilize two refrigerant circuits and ship with a R-454B charge and full oil charge. Each circuit includes filter drier, pressure relief valve, moisture indicating sight glass, thermostatic expansion valve with sensing bulb and externally equalized, and high pressure cutout. The water cooled condensers are shell and tube. It is recommended to clean the condenser mechanically, but the condenser can be cleaned chemically.
Fan array consists of 1-7 direct drive plenum fans with each fan equipped with ECM motors.
PKG-SVX029A-EN

Figure 1. SWUD components
Standard Controls
Standard controls supplied with the unit include SymbioTM 500 unit controls and the TD-7 touch screen display. All basic setup parameters are preset from the factory.
TD-7 Touch Screen Display
· TD-7 is unit mounted and accessible without opening the unit front panel.
· Use the TD-7 touch screen for easy setpoint adjustment.
· The TD-7 displays all unit operating parameters and conditions in a backlit color screen.
Symbio 500 Unit Controller
The SymbioTM 500 provides smart unit control with safety features and control relays for external devices. The Symbio 500 utilizes BACnet® MSTP to communicate to a front end Building Automation System (BAS). The SWUD self-contained unit is controlled by a microelectronic programmable control system programmed from the factory specifically for the application. If additional input or output points are needed, expansion modules can be used. For more detailed information on the control points provided, see the Owners section of this manual.
Optional Controls
Optional controls include a disconnect switch, dirty filter switch, water flow switch, supply air temperature reset, or external setpoint inputs. Morning warm-up operation is available on all units with heat or with downstream VAV boxes with heat. Note: A water flow switch is required for the installation,
either supplied from the factory or field-provided. The static pressure probe, supply air temperature reset sensor options ship separate, but with the unit for field
7

Overview
installation. For more detailed unit control options, see the Owners section of this manual.

Unit Nameplate
The unit nameplate identifies the unit model number. It is located on the door of the starter panel.

PKG-SVX029A-EN

Model Number Description

Digit 1, 2, 3, 4 -- Unit Model
SWUD = Self-Contained Water-Cooled Unitary Device
Digit 5 -- Refrigerant
5 = R-454B
Digit 6, 7, 8 -- Capacity
020 = 20 Tons 025 = 25 Tons 030 = 30 Tons 035 = 35 Tons 040 = 40 Tons 045 = 45 Tons 050 = 50 Tons 055 = 55 Tons 060 = 60 Tons 065 = 65 Tons 070 = 70 Tons 075 = 75 Tons 085 = 85 Tons 090 = 90 Tons 100 = 100 Tons 110 = 110 Tons
Digit 9 -- Unit Voltage
F = 208230/60/3 4 = 460/60/3 5 = 575/60/3
Digit 10, 11 -- Design Sequence
**
Digit 12 -- Fan Type
1 = 1 Fan 2 = 2 Fans 3 = 3 Fans 4 = 4 Fans 5 = 5 Fans 6 = 6 Fans 7 = 7 Fans
Digit 13 -- Compressor Technology
F = Fixed Speed
Digit 14 -- Control Valves
0 = None H = Head Pressure Control Valves
Digit 15 -- Future Use
0 = None

Digit 16 -- Economizer
0 = No Economizer W = With Water Side Economizer H = 2-position Damper Ventilation Interface J = Airside Economizer Interface K = Airside Economizer Interface W/Comparative Enthalpy
Digit 17 -- Water Connections
L = Left Hand Connections with Flow Switch R = Right Hand Connections with Flow Switch
Digit 18 -- Unit Water Connections
1 = Victaulic
Digit 19 -- Air Discharge
H = Horizontal Discharge V = Vertical Discharge
Digit 20 -- Electrical Connections
L = Left Hand Connections
Digit 21 -- Unit Electrical Connections
1 = Disconnect Switch 2 = Terminal Block Digit 22 -- Drain Pan
G = Galvanized Drain Pan S = Stainless Steel Drain Pan Digit 23 -- Future Use
0 = None
Digit 24 Filter Type
A = 2 inch - MERV 8 B = 4 inch - MERV 8 C = 2 inch - Pre-MERV 8, 4 inch, Post-MERV 13 D = 2 inch - MERV 13 E = 4 inch - MERV 13 F = 6 inch - MERV 15 Digit 25 -- Heater
0 = None 4 = Hydronic Remote 5 = Electric Remote (3 stages max, on/off)
Digit 26 -- Shipping Method
S = Single Piece
Digit 27-- Unit Isolators
0 = None A = Isopads

Digit 28 -- Air Volume/Temp Control
A = VAV Control Scheme (Fixed DA Temp) B = VAV Control Scheme (Return Air Reset) C = VAV Control Scheme (Space Temp Reset) D = CV Control Scheme (Fixed DA Temp) Digit 29 -- Agency Listing
0 = None E = ETL listing Digit 30 -- Options
0 = None 2 = Compressor Service Valves Digit 31 -- Space Sensor Options
0 = None 1 = Space Sensor Only Digit 32 -- Future Use
0 = None
Digit 33 -- Industrial Options
0 = None A = Protective Coating Evaporator Coil B = Protective Coating Evaporator Coil + WSE Digit 34 -- Discharge Plenum
0 = None S = Standard Plenum with Field-Cut Holes Digit 35 -- Future Use
0 = None
Digit 36 -- Future Use
0 = None
Digit 37 -- Controller
3 = SymbioTM 500
Digit 38 -- Future Use
0 = None
Digit 39 -- Major Design Version
A = 1.0
Digit 40 -- Design Special
0 = None S = Design Special

PKG-SVX029A-EN

General Data

Table 1. SWUD water-cooled self-contained

Tonnage

20 25 30 35 40 45 50 55 60 65 70 75 85 90 100 110

Compressor Data

Quantity Nominal Ton/Comp Circuits

5 6.25 7.5 8.75 10 11.25 12.5 13.75 15 16.25 17.5 18.75 21.25 22.5 25 27.5

Evaporator Coil Data

Rows Sq. Ft. Fins/in Number of Coils

28.65 28.65 28.65 28.65 35.42 37.5 39.58 40.63 40.63 50 51.11 52.78 52.78 68.33 68.33 68.33

12.0 12.0 12.0 12.0 12 12 12 12 12 12 12 12 12 12 12 12

Condenser Data

Minimumum GPM w/o Econ
(a)

N/A

Minimum GPM w/ Econ Maximum GPM

N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

Evaporator Fan Data

Quantity Diameter Power consumption kW Minimum Design cfm(b) Maximum Design cfm

1 500 4.5 4000 7600

500 500 500 500 500 500 500 500 500 500 500 500 500 500 500

4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5

5000 6000 7000 7400 8600 10000 10800 12000 13000 13600 15200 16600 18000 20400 22600

9500 11400 13300 14060 16340 19000 20520 22800 24700 25840 28880 31540 34200 38760 42940

Refrigerant Charge, lbs. R-454B(c)

Circuit A Circuit B Total

10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 32.5 35.0 37.5 42.5 45.0 50.0 55.0 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 32.5 35.0 37.5 42.5 45.0 50.0 55.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 85.0 90.0 100.0 110.0

Filter Data, Water-Cooled Units

Number - Size (in.)

9-20"x24"

12-20"x24"

15-20"x24"

21-20"x24"

Number of Compressor Tandems

8T Fixed Speed Tandem

10T Fixed Speed Tandem

13T Fixed Speed Tandem

15T Fized Speed Tandem

20T Fixed Speed Tandem

23T Fixed Speed Tandem

26T Fixed Speed Tandem

30T Fixed Speed Tandem

37T Fixed Speed Tandem

45T Fixed Speed Tandem

Number of Fans/Unit

No. of fans

Note: All performance data is provided in the Performance Selection Program. Contact Trane Sales at 770-988-8338 for more information.
(a) All performance data is provided in the Performance Selection Program. Contact MJC Sales at 770-988-8338 for more information. (b) Minimum air flow at part load is 35% of full load design CFM. (c) Refrigerant charge shown is a general guideline, charge to sub-cooling as described in IOM. Note that occasionally a TXV adjustment may need to be made but only after
adequate sub-cooling has been reached.

PKG-SVX029A-EN

General Data

Table 2. EER/IEER ratings

Tonnage 20

Model Number SWUD5020

EER 18.7

IEER 21.3

AHRI Net Cooling Capacity (MBH)
252

SWUD5025

16.7

19.9

292

SWUD5030

17.9

22.6

387

SWUD5035

18.2

22.0

411

SWUD5040

18.2

21.9

458

SWUD5045

17.9

22.1

536

SWUD5050

18.8

22.8

625

SWUD5055

18.3

22.1

665

SWUD5060

18.2

21.7

743

SWUD5065

17.7

21.2

775

SWUD5070

17.3

21.7

839

SWUD5075

16.5

20.4

920

SWUD5085

16.6

20.6

987

SWUD590F

16.4

20.1

1096

100

SWUD5100

16.5

20.3

1234

110

SWUD5110

16.2

19.6

1371

Notes: 1. Cooling only. 2. Cooling performance is rated at 80F EDB/67F EWB with 85 EWT for water-cooled performance and 95F Ambient for air-cooled performance. 3. EER, IEER, and AHRI Net Cooling Capacity are tested in accordance with the AHRI 340/360 (I-P) and certified to 10 CFR Part 431 from the US Department of Energy.

PKG-SVX029A-EN

Pre-Installation
Receiving
Receiving Checklist
Complete the following checklist immediately after receiving unit shipment to detect possible shipping damage:
· Inspect individual cartons before accepting. Check for rattles, bent carton corners, or other visible indications of shipping damage.
· If a unit appears damaged, inspect it immediately before accepting the shipment. Make specific notations concerning the damage on the freight bill. Do not refuse delivery.
· Inspect the unit for concealed damage before it is stored and as soon as possible after delivery. Report concealed damage to the freight line within the allotted time after delivery. Check with the carrier for their allotted time to submit a claim.
· Do not move damaged material from the receiving location. It is the receivers responsibility to provide reasonable evidence that concealed damage did not occur after delivery.
· Do not continue unpacking the shipment if it appears damaged. Retain all internal packing, cartons, and crate. Take photos of damaged material if possible.
· Notify the carrier of the damage immediately by phone and mail. Request an immediate joint inspection of the damage by the carrier and consignee. Note: Notify your Trane representative of the damage and arrange for repair. Have the carrier inspect the damage before making any repairs to the unit.
Ship-Separate Accessories
Field installed components ship separately inside cassette labeled Ship-With Components or on individual pallet.
Contractor Installation Responsibilities
Complete the following checklist before beginning final unit installation:
· Verify the unit size and tagging with the unit nameplate.
· Make certain the floor or foundation is level, solid, and sufficient to support the unit and accessory weights. Level or repair the floor before positioning the unit if necessary.
· Allow minimum recommended clearances for routine maintenance and service. Allow space at end of the unit for servicing. Refer to the unit submittals for dimensions. See also the "Service Clearances," p. 17 section in the "Dimensional Data," p. 14.
· Electrical connection knockouts are on the top, of the starter panel.
12

· Allow adequate space for piping access and panel removal. Locate and properly identify condenser water piping, refrigerant piping, and condensate drain connections depending upon your application. Note: Unit height and connection locations will change if using vibration isolators.
· Electrical supply power must meet specific balance and voltage requirements as described in "Installation Mechanical," p. 19.
· The installer is responsible for providing a condenser main, standby water pump, cooling tower, pressure gauges, and all components for waterside piping.
Unit Inspection
To protect against loss due to damage incurred in transit, perform inspection immediately upon receipt of the unit.
Exterior Inspection
If the job site inspection reveals damage or material shortages, file a claim with the carrier immediately. Specify the type and extent of the damage on the bill of lading before signing. Notify the appropriate sales representative. Important: Do not proceed with installation of a damaged
unit without sales representative approval. · Visually inspect the complete exterior for signs of
shipping damages to unit or packing material. · Verify the nameplate data matches the sales order and
bill of lading. · Verify the unit is properly equipped and there are no
material shortages. · Verify the power supply complies with the unit
nameplate specifications.
Inspection for Concealed Damage
Visually inspect the components for concealed damage as soon as possible after delivery and before it is stored. If concealed damage is discovered: · Notify the carriers terminal of the damage immediately
by phone and by mail. · Concealed damage must be reported within 15 days. · Request an immediate, joint inspection of the damage
with the carrier and consignee. · Stop unpacking the unit. · Do not remove damaged material from receiving
location. · Take photos of the damage, if possible. · The owner must provide reasonable evidence that the
damage did not occur after delivery.
PKG-SVX029A-EN

Repair
Notify the appropriate sales representative before arranging unit installation or repair. Important: Do not repair unit until the damage has been
inspected by the carrier's representative.

Pre-Installation
Unpacking
SWUD units ship fully assembled in a single piece. Some accessories are shipped inside an additional box.

PKG-SVX029A-EN

Dimensional Data
Figure 2. Unit dimensions (in inches)

Depth

Discharge Opening C

Width
Top

Discharge Opening D Width

The Top view drawing is a general representation. The number of fans varies according to capacity. See the general data table for fan quantity.

Airflow
Left (Control Box Side)

Height

Water Pipe

Airflow

Front (Fan side) - Vertical discharge

F
E
Right (Water Connection Side)

Discharge Opening A

21.857 Front Discharge Opening Height

Front (Fan Side) - Horizontal discharge

PKG-SVX029A-EN

Dimensional Data

Table 3. Unit dimensions (in inches)

Unit Size

Dimension

20, 25, 30, and 35T 40, 45, 50, 55, and 60T 65, 70, 75, and 85T

Width (in.)

70.00

Depth (in.)

65.00

Height (in.)

92.00

Discharge Opening - Vertical discharge

Discharge Opening C (in.)

21.42

Discharge Opening D (in.)

36.17

Discharge Opening - Horizontal discharge

Discharge Opening A (in.)

36.24

95.00 80.00 92.00
36.50 61.22
61.24

111.00 80.00 92.00
36.50 77.16
79.09

90, 100, and 110T 140.00 80.00 92.00
36.50 106.00
107.96

Dimension Water Pipe Ø
E F

20, 25, 30, and 35T
2.50 NPT 20.60 12.83

40T
2.50 NPT 30.00 12.87

Figure 3. Condensate drain pipe location

Unit Size 45, 50, 55, 60, and 65T
3.00 NPT 30.00 11.76

70T
3.00 NPT 30.00 13.73

75, 85, 90, 100, and 110T
4.00 NPT 30.00 14.82

6.4

34.3

1.5-in. Dia Condensate

Drain Pipe

Left

(Control Box Side)

Note: Condensate drain connection always on the LEFT (Control Box) side.

PKG-SVX029A-EN

Dimensional Data
Figure 4. Standard plenum (option)

A B

Note: Custom height plenums available upon request.

Table 4. Standard plenum (option)
Unit Size 20, 25, 30, and 35T 40, 45, 50, 55, and 60T 65, 70, 75, and 85T 90, 100, and 110T

Dim A (in.) 42.92 67.77 83.77 112.63

Dim B (in.) 28.55 43.40 43.40 43.40

Height (in.) 30.00 30.00 30.00 30.00

PKG-SVX029A-EN

Service Clearances
Figure 5. Service clearance

Back - Air Inlet
18"

Dimensional Data

Left Side
42"
1) Low Voltage (Control Panel)

Right Side
24"

2) High Voltage Starter Control

Electrical conduit penetrations (recommended)

Table 5. Service/code clearance requirements

Side

Distance - in. (mm)

Front

Left

Right

Back

Front
42"
Purpose NEC Code Requirements; Fan, Compressor, Condenser, Service/Removal
NEC Code Requirements Door Clearance
Provides Uniform Airflow

PKG-SVX029A-EN

Weights
Table 6. Unit weights
Unit Size
20 25 30 35 40 45 50 55 60 65 70 75 85 90 100 110

Base Weight (lbs) 2763 2813 2915 2965 3423 3489 3654 3734 3904 4231 4240 4367 4466 5137 5237 5336

Waterside Economizer (lbs) 459 459 459 468 578 602 626 638 649 679 777 796 796 1055 1055 1055

PKG-SVX029A-EN

Installation Mechanical
Unit Handling
WARNING
Improper Unit Lift!
Failure to properly lift unit in a LEVEL position could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury, and equipment or property-only damage. Test lift unit approximately 24 inches (61 cm) to verify proper center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level.
· Use spreader bars to avoid unit damage.
· Spreader bar must be a minimum of 11 feet for 20 to 85 ton units and 12 feet for 90 to 110 tons. Chains must not bear on top of unit.
· Run straps through fork pockets to connect to the spreader bar. See detail in Figure 6, p. 19 and Figure 8, p. 20.
· Lift using overhead crane only. Adjust rigging for unit center of gravity.
· Unit center of gravity will fall within center of gravity block at various locations depending on unit options.
· See unit nameplate for unit weights.
· Unit has built-in fork pockets for easy forklift maneuverability.
· Do not stack units.
Figure 7. Gravity Block Dimensions 20 to 80 tons, in.

Figure 6. Detail of how to run straps through fork pockets to connect spreader bar on self-contained
Spreader bar
Straps

Fork Pockets

Table 7. Gravity block dimensions 20 to 80 tons, in.

Unit Size (Tons)
20 to 35
40 to 60
65 to 85
90 to 110

Dim A 26.8 34.8 35.4 35.3

Dim B 36.2 35.9 35.7 36.7

Dim C 34.8 47.5 53.9 70.6

Dim D 65.0 80.0 80.0 80.0

Dim E 70.0 95.0 111.0 140.0

92.0 B

C E

UNIT CENTER OF GRAVITY

AIRFLOW

A D

PKG-SVX029A-EN

Installation Mechanical
Figure 8. Gravity block location and dimensions for 90 to 110 ton units

Installation Preparation
Before installing the unit, perform the following procedures to confirm proper unit operation. 1. Position the unit and pallet in its final location. 2. Test lift the unit to determine exact unit balance and
stability before hoisting it to the installation location. See "Unit Handling," p. 19 for proper rigging procedures and cautions. 3. Remove the protective shipping covers from the unit.
Unit Vibration Isolator Option
Important: Vibration isolation is not necessary for the unit since the factory internally isolates the fan and compressor, thus creating double isolation. Trane strongly recommends consulting a vibration specialist when considering double isolation. Trane does not recommend doubleisolation.
Unit Isolator Installation Procedure
Use the following procedure to install isolators: 1. Position the isolators under the unit base referring to
the isolator placement sheet that ships with the unit isolators. Lift one end of the unit at a time to position the isolators. 2. Shim as required to level the unit. It must be less than 1/8-inch per foot difference. Note: The unit is equipped with a positively sloped drain
pan to help indoor air quality (IAQ) and does not require one corner of the unit to be pitched.
Duct Connections
Return air enters the rear of the unit and conditioned supply air discharges through the top.
20

Notes: ·
·

Attach supply air ductwork directly to the unit top panel, around the fan discharge opening. A duct collar is not provided. Units equipped with flexible horizontal discharge plenum option may include a duct collar when holes are factory cut.

Install all air ducts according to the National Fire Protection Association standards for the Installation of Air Conditioning and Ventilation Systems other than Residence Type (NFPA 90A) and Residence Type Warm Air Heating and Air Conditioning Systems (NFPA 90B).

Make duct connections to the unit with a flexible material such as heavy canvas. If a fire hazard exists, Trane recommends using Flexweave 1000, type FW30 or equivalent canvas. Use 3 inches for return duct and 3 inches for discharge duct. Keep material loose to absorb fan vibration.

· If using return ductwork to the unit, secure it with 3 inches of flexible duct connector.

· Extend discharge duct upward without change in size or direction for at least three fan diameters.

· Use 3-inch flexible duct connection on discharge ductwork.
Note: Compressors and fan assembly are internally isolated. External isolation devices (spring mounting isolators) are at discretion of a vibration specialist consulted by building or HVAC system designer.

Run the ductwork straight from the opening for a minimum of three fan diameters. See Figure 9, p. 21. Extend remaining ductwork as far as possible without changing size or direction. Do not make abrupt turns or transitions near the unit due to increased noise and excessive static losses. Use elbows with splitters or turning vanes to minimize static losses.

Poorly constructed turning vanes may cause airflow generated noise. Align the fan outlet properly with the ductwork to decrease noise levels in the duct and to increase fan performance. To complete trunk ductwork to the VAV terminal units, refer to the VAV box manuals for

PKG-SVX029A-EN

specific requirements. Check total external static pressures against fan characteristics to be sure the required airflow is available throughout the ductwork.
To achieve maximum acoustical performance, minimize the duct static pressure setpoint.
Figure 9. Duct connection recommendations

Discharge Duct
3-inch Flexible Duct

3 Fan Diameters

Return Air

Installation Mechanical
1. Install the vent plugs in the economizer coil headers and condenser manifolds. See Figure 10, p. 21. These plugs ship in a bag with the condenser drain plugs.
2. Attach the water supply line to the inlet connection, and the return line to the outlet connection. Entering and leaving water connections for all condensers are factory manifolded and require only single connections for entering and leaving water. If the unit has a waterside economizer and/or control valves, the factory pipes between these components.
3. If using a cooling tower, refer to Figure 11, p. 22 for a typical piping circuit from the unit.
4. Confirm the water pressure to the unit does not exceed 150 psig.
Note: To prevent water pump damage, design system piping to provide relief when using energy saving waterside economizer valves.
Figure 10. Economizer coil vent and condenser cleanout/drain plugs

Water Piping
Condenser Connections
WARNING
High Pressure Water!
Failure to follow instructions below could result in death or serious injury, and equipment damage. Provide relief valve on system water piping to prevent instantaneous release of high pressure water.
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water could result in scaling, erosion, corrosion, algae or slime. Use the services of a qualified water treatment specialist to determine what water treatment, if any, is required. Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.
All field-installed piping must conform to applicable local, state, and federal codes. To complete condenser water connections follow the procedure below. Note: Four (4) condenser waterline drain plugs ship in a
bag in the left end of the unit. The installer must field install these four plugs using pipe thread sealer. An additional plug is provided for units with a waterside economizer.
PKG-SVX029A-EN

Condensate Drain Connections
Note: Unit is not internally trapped. Installer will need to provide an external trap for unit to operate properly.
Locate condensate drain on the unit. Connect condensate drain piping to the 1-1/4-inch NPT internal fitting, using at least 7/8-inch OD copper or 3/4-inch OD iron pipe. Pitch the condensate line downward a minimum of 1/2-inch for each 10feet of horizontal run, away from the unit. Be sure to install the condensate drain ptrap drain plug. Before starting the unit, fill the trap with water to prevent negative pressure in the fan section from impeding condensate flow.
21

Installation Mechanical
To facilitate drain pipe cleaning, install plugged tees in place of 90° elbows.
General Waterside Recommendations for Cooling Towers
Cooling tower control affects the unit cycle rates. Condenser water temperature swings from 10°F to15°F may cause excessive compressor, water valve, and unit cycling. Set the tower controls to minimize compressor/unit cycling.
Waterside Piping Arrangements
Install a condenser water pump between the cooling tower (either open or closed) and the self-contained unit. Lay out the remainder of the system condenser piping in reverse returns. This helps balance the system by equalizing the length of supply and return pipes. Multi-story buildings may use a direct return system with balancing valves at each floor.
Install the supply riser and its return in close proximity. Furnish both with permanent thermometers to check the waterside balance during start-up and routine maintenance checks.
Include strainers at each pump inlet and unit. Install drain valves at the riser base to allow drainage points for system flushing during start-up and routine maintenance. For condenser draining and header removal, include a shutoff/ balancing valve on the entering and leaving waterside pipes, drain tees, and unions of each unit. Note: Unit does not have floor drains.
Figure 11. Condenser water piping components for cooling tower system

Water Temperature Requirements
Do not allow the entering water temperature to go below 54°F (12.2°C) on units with constant water flow (basic piping).This will cause the compressors to shutdown and the mechanical cooling function will lockout. The economizer (if enabled) will continue to function. The compressors will reset when the entering water temperature reaches 58°F (15°C).
Units with variable water flow (intermediate piping) have a modulating condensing pressure control valve that allows compressor operation down to entering water temperatures of 37°F (3°C). Note: Units with a waterside economizer can be set from
the human interface panel for variable or constant water flow.
Water Piping Verification
· Make return and supply water connections to the unit and/or waterside economizer piping package with recommended valves and piping components.
· Install unions to allow waterside maintenance.
· Install cooling tower and standby pumps.
· Treat water to prevent algae, slime, and corrosion.
· Prevent refrigerant piping from rubbing against other objects.
Installating the Hydronic Coil
Refrigerant System
Trane Water Cooled Commercial Self-Contained units ship factory charged with R-454B refrigerant.

PKG-SVX029A-EN

Installation - Electrical
Unit Wiring Diagrams
Specific unit wiring diagrams are provided on the inside of the control panel door. Use these diagrams for connections or trouble analysis.
Supply Power Wiring
It is the responsibility of the installer to provide power supply wiring to the unit terminal block or the non-fused disconnect switch option. Wiring should conform to NEC and all applicable code requirements.
Bring the supply wiring through the top of the starter panel. The hole will be field cut at the electrician's discretion. Connect the three phase wires to the power terminal block or the non-fused disconnect switch in the control box terminals. Refer to specific wiring diagrams and fuse information in the control panel.
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in equipment damage as the equipment was not designed or qualified to accept other types of conductors.
NOTICE
Motor Damage!
Correct phase sequence is critical. If phase sequence of the incoming line voltage is not correct, it could result in motor damage.

Voltage Range
Voltages must be within ±10% the nameplate voltage. Confirm the unit voltage is balanced by measuring at the compressor terminals. Voltage imbalance on three phase systems can cause motor overheating and premature failure. Maximum allowable imbalance is 2.0 percent.
Voltage Imbalance
Read the voltage at the compressor terminals to determine if it is balanced. Voltage imbalance on three phase systems can cause motor overheating and premature failure. The maximum allowable imbalance is 2.0 percent. Voltage imbalance is defined as 100 times the sum of the deviation of the three voltages from the average (without regard to sign) divided by the average voltage. For example, if the three measured voltages are 221, 230, and 227, the average voltage would be:
(221 + 230 + 227) / 3 = 226 volts
The percentage of voltage imbalance is then: 100 x (226 221) / 226 = 2.2%
Phase Monitor
Unit is equipped with a phase monitor in the control box. The phase monitor will protect against phase loss, imbalance and reversal of line voltage. If a fault occurs, the unit will be locked out until the phase is corrected.
Control Power
NOTICE
Component Damage!
Failure to follow instructions below could result in immediate or premature component failures. Unit transformers are sized to provide power to the unit only. Do not use these transformers to supply power to field equipment.
In this example, 2.2 percent imbalance is not acceptable. When a voltage imbalance of more than 2.0 percent exists, check the voltage at the unit disconnect switch. If the imbalance at the unit disconnect switch does not exceed 2.0 percent, faulty unit wiring is causing the imbalance. Conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.
Access the connection terminal block through the control panel on the upper left side of the unit. All wiring should conform to NEC and applicable local code requirements.
Confirm all wiring connections are secure. Reference the unit specific diagrams inside the control panel. Note: Unit transformers IT1, IT3, IT4 and IT5 are sized to
provide power to the unit only.

PKG-SVX029A-EN

Installation - Electrical

Selection Procedures
· RLA = Rated Load Amps · Compressor LRA = Locked Rotor Amps · Fan Motor LRA = Locked Rotor Amps, N.E.C. Table
430 -150 · FLA = Full Load Amps, N.E.C. Table 430 -150 · Voltage utilization range is ±10%
Determine Minimum Circuit Ampacity (MCA)
MCA = 1.25 x largest motor amps/VFD amps (FLA or RLA) + the sum of the remaining motor amps.

Determine Max Fuse (MFS) and Max Circuit Breaker (MCB) Sizes
MFS and MCB = 2.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.
For units with the dual power option, there are two electrical circuits that need calculations using the previous formulas:
· Circuit #1 fans
· Circuit #2 compressors
If the rating value determined does not equal a standard current rating of over current protective device, use the next lower standard rating for the marked maximum rating.

Table 8. Electrical service sizing data -- motors

Digit 9 - Unit Voltage
460/60/3

Digit 9 4

Tonnage Comp 1

7.1

Comp 2 7.1

460/60/3

9.1

460/60/3

11.9

460/60/3

12.4

460/60/3

12.4

460/60/3

15.4

460/60/3

15.4

460/60/3

19.4

460/60/3

20.6

460/60/3

20.6

460/60/3

24.0

460/60/3

32.8

460/60/3

32.8

460/60/3

32.8

460/60/3

100

38.5

460/60/3

110

38.5

208-230/60/3

16.0

208-230/60/3

21.2

208-230/60/3

24.4

208-230/60/3

28.7

208-230/60/3

28.7

208-230/60/3

33.3

208-230/60/3

33.3

208-230/60/3

40.8

208-230/60/3

45.9

208-230/60/3

45.9

208-230/60/3

49.0

208-230/60/3

62.1

208-230/60/3

62.1

208-230/60/3

62.1

Comp 3
7.1 9.1 11.9 11.9 12.4 12.4 15.4 15.4 19.4 20.6 20.6 20.6 24.0 32.8 32.8 38.5 16.0 21.2 24.4 24.4 28.7 28.7 33.3 33.3 40.8 45.9 45.9 45.9 49.0 62.1

Comp 4 Fan FLA Qty Fans

7.1

1.00

9.1

7.1

1.00

11.9

7.1

2.00

11.9

7.1

2.00

12.4

7.1

2.00

12.4

7.1

2.00

15.4

7.1

3.00

15.4

7.1

3.00

19.4

7.1

4.00

20.6

7.1

4.00

20.6

7.1

4.00

20.6

7.1

4.00

24.0

7.1

5.00

32.8

7.1

5.00

32.8

7.1

6.00

38.5

7.1

7.00

16.0

13.5

1.00

21.2

13.5

1.00

24.4

13.5

2.00

24.4

13.5

2.00

28.7

13.5

2.00

28.7

13.5

2.00

33.3

13.5

3.00

33.3

13.5

3.00

40.8

13.5

4.00

45.9

13.5

4.00

45.9

13.5

4.00

45.9

13.5

4.00

49.0

13.5

5.00

62.1

13.5

5.00

Misc 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00

MCA 38 47 66 67 68 75 88 97 115 117 124 144 158 176 196 214 84 105 133 142 151 161 184 201 241 251 258 287 307 333

MOP 45 56 77 79 80 90 103 116 135 137 148 177 191 208 234 253 100 127 157 171 179 195 218 242 287 297 307 349 369 395

PKG-SVX029A-EN

Installation - Electrical

Table 8. Electrical service sizing data -- motors (continued)

Digit 9 - Unit Voltage
208-230/60/3

Digit 9 F

Tonnage Comp 1

100

83.1

Comp 2 83.1

Comp 3 62.1

Comp 4 62.1

208-230/60/3

110

83.1

Fan FLA Qty Fans

13.5

6.00

13.5

7.00

Misc 2.00 2.00

MCA 394 450

MOP 477 533

575/60/3

6.4

5.7

1.00

0.75

575/60/3

7.7

5.7

1.00

0.75

575/60/3

9.4

5.7

2.00

0.75

575/60/3

9.0

9.4

5.7

2.00

0.75

575/60/3

9.0

5.7

2.00

0.75

575/60/3

12.9

9.0

5.7

2.00

0.75

575/60/3

12.9

5.7

3.00

0.75

575/60/3

13.7

12.9

5.7

3.00

0.75

575/60/3

14.5

13.7

5.7

4.00

0.75

575/60/3

14.5

5.7

4.00

0.75

100

575/60/3

19.2

14.5

5.7

4.00

0.75

115

575/60/3

24.0

14.5

5.7

4.00

0.75

107

131

575/60/3

24.0

19.2

5.7

5.00

0.75

122

146

575/60/3

24.0

5.7

5.00

0.75

131

155

575/60/3

100

27.1

24.0

5.7

6.00

0.75

144

171

575/60/3

110

27.1

5.7

7.00

0.75

156

183

Notes: 1. MCA: Minimum Circuit Ampacity is 125 percent of the largest compressor RLA or Drive input current, plus 100 percent of the other compressor (s) RLA, plus the sum of the condenser fan RLA, plus any other load rated at 1 AMP or more. 2. Maximum Breaker Overcurrent Protection (MOP): 225 percent of the largest compressor RLA or VSD drive Input, plus 100% of the other compressor(s) RLA, plus the sum of the condenser fan Motor/Drive FLA, plus any other load rated at 1 AMP or more. 3. Recommended disconnect switch: 110 percent to 115 percent of the sum of the RLA of the compressors, VSD drive input, fan motor/drive, and controls FLA. 4. RLA: Rated in accordance with UL standard 1995. 5. Local codes may take precedence. 6. Fix speed compressor are across the line starting, the VSD compressors are controlled by VSD drive. Compressors will never start simultaneously. 7. Voltage utilization range is ±10 percent.

Static Pressure Transducer Installation (VAV Units Only)
Supply air static pressure controls the ECM fans. A static pressure bulkhead connector ships separate in control panel for field installation in the supply air duct work. Installer is responsible for providing pneumatic tubing.
Transducer Inlet Location
Place bulkhead connector in an area of ductwork that will provide an average and evenly distributed airflow pattern. Use the following guidelines to determine an appropriate installation location.
1. Locate static bulkhead connector approximately 2/3 to 3/4 the way down longest duct run, in an area approximately 10 duct diameters downstream and 2 duct diameters upstream of major interferences, turns, or changes in duct diameter.
2. When installing pneumatic tubing between head assembly and transducer in control panel, do not

exceed 250 feet for 1/4-inch OD tubing or 500 feet for 3/8-inch OD tubing.
Installing the Transducer
Use the following procedure to properly install the static pressure transducer:
1. Connect the pneumatic tubing from the sensing head to the push-on tubing connection in the control panel. Use a plastic static pickup tubing. Do not exceed 250 feet for 1/4-inch OD tubing or 500 feet for 3/8-inch OD tubing.
Transducer inside control panel picks up low side or reference pressure. Note: If plastic tubing pulls away from a connection, trim it
back before replacing it on the fitting. Stretched tubing may leak and cause faulty control.

PKG-SVX029A-EN

Installation - Electrical

Figure 12. Static pressure sensor installation

Static Pressure Head Assembly

Duct

Connector for 1/4-inch Tubing

Airflow

Note: Place Sensor Inlet Perpendicular to Airflow

Zone Sensor Option used for Discharge Air Reset by Space Temperature
Zone Temperature Sensor, BAYSENS077 (Optional Item)
Figure 13. Zone temperature sensor

This zone sensor includes an internal thermistor and should be mounted in the zone, Model Number Digit 31=1. This sensor is available for use with all zone sensor options to provide remote sensing capabilities.
Zone Sensor Installation WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer's literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
26

NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in equipment damage as the equipment was not designed or qualified to accept other types of conductors.
Note: For additional information regarding the safe discharge of capacitors, see Discharging Capacitors in HVAC Systems Service Bulletin (PROD-SVB06*EN).
All sensor options ship in the main control panel and are field installed. Programmable option installation procedures.

Mounting Location
Mount the sensor on the wall in an area with good air circulation at an average temperature. Avoid mounting space temperature sensor is areas subject to the following conditions:
· Drafts or dead spots behind doors or in corners
· Hot or cold air from ducts
· Radiant heat from the sun or appliances
· Concealed pipes and chimneys
· Unheated or non-cooled surfaces behind the sensor, such as outside walls
· Airflows from adjacent zones or other units
To mount the sensors, remove the dust cover and mount the base on a flat surface or 2-inch x 4-inch junction box. Sensors ship with mounting screws.

Mounting the Subbase

Remove the zone sensor cover from subbase, and mount subbase on the wall or on a 2-inch x 4-inch junction box. Route wires through the wire access hole in the subbase. See Figure 14, p. 27. Seal the hole in the wall behind the subbase.

Notes: ·
·

Guidelines for wire sizes and lengths are shown in Table 9, p. 27. The total resistance of these low voltage wires must not exceed 2.5 ohms per conductor. Any resistance greater than 2.5 ohms may cause the control to malfunction due to excessive voltage drop. Do not run low-voltage control wiring in same conduit with high-voltage power wiring.

Wiring
1. Run wires between the unit control panel and the zone sensor subbase. To determine the number of wires required, refer to the unit wiring diagrams.
2. Connect the wiring to the appropriate terminals at the unit control panel and at the zone sensor subbase. In general, zone sensor connections to the unit use the

PKG-SVX029A-EN

Installation - Electrical

convention of connecting zone sensor terminals to like numbered unit terminals (1 to 1, 2 to 2).The connection detail is shown on the unit wiring diagrams located in the unit control panel.
3. Replace the zone sensor cover back on the subbase and snap securely into place.
Standard Remote Sensor (BAYSENS077)
When using the remote sensor, BAYSENS077, mount it in the space that is to be controlled. Wire according to the interconnecting wiring diagrams on the unit.

Table 9. Zone sensor maximum lengths and wire size

Distance from Unit to Controller
0-150 feet

Recommended Wiring Size 22 gauge

151-240 feet

20 gauge

241-385 feet

18 gauge

386-610 feet

16 gauge

611-970 feet

14 gauge

Figure 14. Typical zone sensor installation

Mounting Directly to the Wall

Mounting to Junction Box
Junction

PKG-SVX029A-EN

Operating Principles
Control Sequences of Operation
Occupied/Unoccupied Switching
There are three ways to switch occupied/unoccupied:
1. Field-supplied contact closure [hardwired binary input to field wiring terminal block (2TB3)] - This input accepts a field supplied switch or contacts closure such as a time clock. Open Contacts = Unoccupied and Closed Contacts = Occupied.
2. BACnet® MSTP control system can control the occupied/unoccupied request of the unit.
3. Through the TD-7 display via the on-board schedule.
Compressor Lead/Lag
Compressor lead/lag is present in the controls for all units. This is used to balance the run hours between all the compressors by putting the highest run hours to run last.
Emergency Stop Input
A binary input is provided on the units field wiring terminal block (2TB3) for installation of a field-provided switch or contacts to immediately shutdown all unit functions. An open contact will indicated an emergency shutdown condition exist and shut down the unit and generate a manual reset alarm. A closed set of contacts will indicate a normal condition. After the contacts are closed, the manual reset alarm must be cleared to resume unit operations.
External Auto/Stop Input
A binary input is provided on the unit's field wiring terminal block (2TB3) for installation of a field-provided switch or contacts to safely shutdown all unit functions. An Open contact will indicate a Stop condition exist and the unit will shutdown and generate an automatic reset alarm. A Closed contact will indicate an Auto condition and allow the unit to operate.
Local Auto Stop
A binary value is located on the TD-7 which allows the user to start and stop the unit in a safe manner for maintenance. On the TD-7 home screen in the upper right hand corner the unit can be put into Auto to perform normally or Stop to perform a controlled shutdown and keep the unit off.
Head Pressure Control
Water-cooled condensers: Units are ordered with the optional flow control valves and configured for variable water flow will modulate a water valve to maintain a userdefined condensing pressure setpoint and compressor refrigerant pressure differential. Condensing pressure and pressure differential will be referenced utilizing factory installed suction and discharge pressure sensors located on each circuit.
28

Water Purge
This user-definable feature allows the user to select a purge schedule to automatically circulate water through the economizer and condensers periodically during nonoperational times. This allows fresh chemicals to circulate in waterside heat exchangers. Note: Only available on units with condenser valves.
Supply Air Temperature Control Unit Sequence of Operation
Discharge Air High Temp Limit Software Alarm (Software)
When the discharge air temperature is above the discharge air high temperature cutout setpoint of 100 degrees for 5 minutes, the unit will perform a controlled shutdown. A Manual Reset alarm will generate and must be cleared before the unit can resume operating.
Condenser Water Low Temperature Alarm (Software)
When either the entering or leaving condenser water temperature is below the condenser water low temperature cutout setpoint of 35 degrees for 5 minutes, the unit will perform a controlled shutdown. All condenser water valves will be commanded open if installed, and a manual reset diagnostic will be generated and need to be cleared before the unit can resume operation.
Leaving Air Low Temperature Alarm
When the discharge air temperature is below the discharge air temperature cutout for 5 minutes, the unit will perform a controlled shutdown. A Manual Reset alarm will be generated and need to be cleared before the unit can resume operation.
Occupied Fan Operation
When all alarms are cleared, the unit is occupied, and the local auto stop is in auto, all fans that are available will start up and operate at 30 percent speed for 45 seconds. For CV, fans will then release to control to the fan fixed speed setpoint.
VAV
The fans will then release to control to the duct static pressure setpoint. The fans will modulate to maintain the duct static pressure at the duct static pressure setpoint. The fans are commanded off during the unoccupied mode.
Heat/Cool Mode
The unit is in Cooling mode by default. The front end Building Automation System will switch the Heat/Cool
PKG-SVX029A-EN

Mode request multistate value between the Heating and Cooling modes to get the desired control.
Cooling/Waterside Economizer
During occupied cooling mode, the waterside economizer option and mechanical cooling are used to control the supply air temperature. The supply air temperature setpoint is user defined at the human interface panel.
After the fans run for 5 minutes, and a call for cooling is calculated, the Cooling Tower/Pump Command is turned ON. After the Condenser Water flow switch closes proving flow, the Compressors and/or Economizer will be allowed to start.
Waterside economizing enables when the unit entering water temperature is less than the entering mixed air temperature. This is set at Waterside Economizer Enable Offset setpoint. The factory default is 7°F, but can be adjusted by the user at the TD-7 or via BACnet.
The economizer acts as the first stage of cooling. If the economizer is unable to maintain the supply air setpoint, the compressor module will bring on the compressors as required to meet the setpoint. If the unit does not include an economizer, only mechanical cooling will satisfy cooling requirements.
Thermostatic Expansion Valve
NOTICE
Compressor Damage!
Do not operate with water loops with less than five minutes circulation time as it could result in poor superheat control and compressor damage.
Refrigerant system reliability and performance is heavily dependent upon proper superheat. The importance of maintaining the proper superheat cannot be overemphasized. Accurate measurements of superheat will provide the following information:
· How well the expansion valve is controlling the refrigerant flow.
· The efficiency of the evaporator coil.
· The amount of protection the compressor is receiving against flooding.
The expected range for superheat is 11-15°F at full load conditions. At part load, expect a properly adjusted expansion valve to control to 8-12°F superheat.
Systems operating with lower superheat could cause serious compressor damage due to refrigerant floodback.
Fan Operation
Multiple, identical fans are arranged in the fan cabinet to meet the customer airflow and static requirements. Each fan speed, start/stop command, and fault status are controlled and monitored individually by the unit controller. However, all fans receive the same fan speed signal to
PKG-SVX029A-EN

Operating Principles

meet airflow and static demand, and all fans are commanded On upon Unit Controller status transition to Occupied Mode.
Each fan assembly has its own motor with integrated electronically commutated motor (ECM). Each fan ECM varies the speed of the fan proportional to a 0-10 Vdc signal supplied by the XM90.1 module (and XM30.2 on 85 to 100 units / XM30.3 on 110 ton units). The ECM starts and stops the fan according to the Enable/ Disable Binary Output from the XM90.1 module. If the ECM is faulted it annunciates this via a dry contact that is sensed by the unit controller on the XM90.1 module (and XM30.2 on 85 to 100 units / XM30.3 on 110 ton units).
Supply Air Static Pressure High Limit
During normal operation, the supply air static is monitored. If at any time the static pressure exceeds the software high static limit (defaulted at 2.0 inches from the factory) the unit will immediately shut down and generate a diagnostic.
In order for the unit to resume operation, the Alarm Reset must be toggled from the TD-7. The software high static limit can be user adjusted at the TD-7.

Compressors
SWUD uses fixed speed (FS) compressors and a balanced starts routine.

Compressor Oil
All compressors have an Oil Sight Glass. Confirm oil is visible in the sight glass when the compressor is off or running.

High Pressure Cutout Switch (HPC)
Each FS compressor has an HPC installed in its discharge line. The switch is set to open at 553 psi +/-15 and re-close at 424 +/-30.
Table 10. Pressure cutouts (open/close)

Unit Model SWUD

High Pressure Cutout
553/424

Low Pressure Cutout
49/74

Note: Update with MSC high pressure cutout. No low pressure cutout for .
On the fixed speed compressors, if an HPC opens, the 24 Vac power that energizes the compressor start contactor is interrupted and the compressor will turn off. The unit controller will detect this and lock the circuit out on a high pressure cutout.
Compressor Pressure Sensors
Each circuit has its own set of suction and discharge pressure sensors. The sensors are powered by the 5 Vdc power supply 2U1. Their range is 0-600 psig and their

Operating Principles
voltage output is linearly proportional to the sensed pressure.
The discharge pressure sensor is used by the unit controller to do the following:
· Compute circuit differential pressure.
· Warn the user if a high discharge pressure condition occurs.
The suction pressure sensor is used by the unit controller to do the following:
· Detect low suction pressures.
· Compute circuit suction superheat.
· Compute circuit differential pressure.
Compressor Suction Temperature
Each circuit has its own suction temperature thermistor. It is used to compute circuit suction superheat. If superheat is less than 4 degrees for 5 minutes, or more than 25 degrees for 1 O minutes, the circuit is locked out on a fault and a diagnostic is annunciated.
Fixed Speed Compressor (FS)
Each FS compressor has two 24 Vac, 30W crankcase heaters. The power for these heaters is routed through a NC auxiliary contact on it's respective start contactor. This way the heater is energized whenever the compressor is Off.
In each FS compressor motor junction box is a 24 Vac powered CoreSenseTM compressor protection module (MCSP). This module displays compressor status and diagnostics and provides the following protections:
· Motor temperature protection.
· Missing phase protection.
· Reverse phase protection.
· Low control circuit voltage protection.
· Short cycling detection and alert.
If the CoreSense module detects a fault condition it opens a dry contact on the module interrupting power to that compressors run contactor coil. The power interruption is detected by the Unit Controller, which disables the compressor and annunciates a Compressor Safety Circuit diagnostic. After the cause of the fault is remedied, a latching fault can be cleared by cycling 24 Vac module power.
Compressor Safety Circuit
Each fixed speed compressor has a Compressor Safety Circuit intended to protect the circuit from a variety of fault conditions and to distinguish those failures from HPC trips.
For each FS compressor, 24 Vac power is routed in order from the control power transformer (CPT) through its respective:
1. HPC
30

2. MCSP dry contact 3. Circuit breaker auxiliary - 1CB1, 1CB2, 1CB3 or 1CB4 4. Start/Stop NO contact on the SymbioTM 500 binary
output module 5. Compressor start contactor coil - 1K1, 1K2, 1K3 or 1K4 6. From the compressor start contactor coil, the same 24
Vac signal is routed through the contactor NO auxiliary to an isolating relay - 2K2, 2K4, or 2K8 If any of these devices contacts should open, 24 Vac is interrupted from the compressor start contactor and the compressor will shut-off. The unit controller can distinguish between an HPC switch opening and any of the other devices in the circuit opening. It will annunciate either High Pressure Cutout Compressor X or Compressor Safety Circuit X.
Compressor Limit Conditions
Because the SWUD uses suction and discharge pressure sensors rather than limit switches, the Unit Controller can sense when a refrigerant circuit is approaching a high or low pressure limit condition. Low Pressure Limit conditions can be caused by the following: · Low discharge air temperature · Low airflow · Dirty air filters · TXV malfunction · Low refrigerant charge · Faulty suction pressure sensor High Pressure Limit conditions can be caused by the following: · Low condenser water flow · High entering condenser water temperature · Fouled entering condenser water strainer · TXV malfunction · Refrigerant over charge · Faulty discharge pressure sensor The Unit Controller TD-7 will annunciate a Limit Condition if an FS compressor circuit enters one.
PKG-SVX029A-EN

Figure 15. Fixed speed compressor protection module (MCSP)
Compressor Staging
Fixed speed compressors cycle to maintain the operating state required by the temperature controls. In the event of a compressor failure, the next available compressor turns on. During normal conditions, compressors will not turn on until they have been off for at least three minutes. Normal operating conditions are established on an individual compressor basis. When a compressor starts, its timer also starts.
Compressor Control
Steps of mechanical cooling are control based on supply air or zone temperature. Compressor staging is based upon a proportional, integrating (PI) control algorithm.
Waterside Components
Waterside components consist of water piping, water valves, water flow switch option, water cooled condenser, and the economizer option.
Water Purge
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water could result in scaling, erosion, corrosion, algae or slime. Use the services of a qualified water treatment specialist to determine what water treatment, if any, is required. Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water. This user-definable feature allows the user to select a purge schedule to automatically circulate water through the economizer and condensers periodically during nonoperational times. This allows fresh chemicals to circulate
PKG-SVX029A-EN

Operating Principles

in waterside heat exchangers. This feature is on all units and is defined at the TD-7.

Water Piping Options
Water piping is factory-installed with left-hand (standard) and right hand (optional) connections on units.
If equipped, the unit water cooled condenser uses 24 VAC powered water regulating ball valve to control flow through the condenser. the unit controller modulates the condenser flow to limit discharge pressure, help prevent high pressure cutout trips, and maintain a circuit minimum differential pressure.
The valve can also be used for condenser system chemical purge and condenser cooling loop system balance.
This option provides condensing temperature control when the unit is configured (user defined at the HI) for variable water flow with or without a waterside economizer. A twoway modulating control valve is wired and installed in the unit to maintains a specific range of water temperature rise through the condenser when entering fluid temperature is less than 58°F (15°C).This option allows the compressor to operate with entering fluid temperature down to 35°F (2°C). The minimum valve position to maintain minimum condenser flow rates is user-defined at the HI. This valve drives closed if the unit shuts down or if a power failure occurs.
With Compatible piping configurations, the unit can be set to the following control schemes at the TD-7.
· Constant water flow or
· Variable water flow
Constant water flow is for condenser pumping systems that are not capable of unloading the water-pumping system. Variable water flow maximizes energy saving by unloading the water pumping system.

Water Flow Switch Option
A water flow switch is factory installed in the condenser water pipe within the unit. Whenever the flow switch detects a water flow loss prior to or during mechanical cooling, compressor operation locks out and a diagnostic code displays. If water flow is restored, the compressor operation automatically restores.

Water-Cooled Condensers
Units that are set up for variable water flow will modulate a water valve to maintain a user-defined condensing temperature setpoint. Condensing temperature will be referenced utilizing factory installed sensors located at each condenser.
Table 11. Condenser water piping connection sizes

Water Pipe (inlet and outlet)

20 to 40 tons
2.50 NPT

45 to 70 tons
3.00 NPT

75 to 110 tons
4.00 NPT

Operating Principles
Waterside Economizer Option
The waterside economizer option takes advantage of cooling tower water to either precool the entering air to aid the mechanical cooling process or, if the water temperature is low enough, provide total system cooling. Waterside economizing enables when the unit's entering water temperature is below the unit's entering mixed air temperature by a minimum of 4°F plus the economizer's approach temperature. The approach temperature default is 4°F. Waterside economizing disables when the unit's entering water temperature is not below the unit's entering mixed air temperature by at least the water economizer approach temperature. The approach temperature defaults to 4°F. The economizer acts as the first stage of cooling. If the economizer is unable to maintain the supply air setpoint, the unit control module brings on compressors as required to meet the setpoint. The waterside economizer includes a coil, modulating valves, controls, and piping with cleanouts. The coil construction is ½-inch (13 mm) OD seamless copper tubes expanded into aluminum fins. The evaporator and economizer coils share a common sloped (IAQ) drain pan. Drain pan options are either galvanized or stainless steel, and are insulated and internally trapped. The tubes are arranged in a staggered pattern to maximize heat transfer. The coil has round copper supply and return headers with removable clean-out and vent plugs. Figure 16. Waterside economizer flow control
UNIT
C
WSE
Heat Mode
The BAS HEAT option supports remote heat (hot water coil or electric heat). When the SWUD Operating Mode is set to BAS HEAT, the unit controller ends any Cooling Mode operation (Mechanical and/or Water Side Economizer) and transitions to control Discharge Air Temperature to the BAS HEAT setpoint temperature. The unit controller does this by opening and closing the heating ball valve or staging the electric. The Fan Array is controlled normally to maintain static pressure to the Static Pressure Setpoint.
32

If the Discharge Air Temperature exceeds 104°F a Manually Resettable High Discharge Air Temperature Diagnostic is annunciated.
Dirty Air Filter Sensor Option
A factory installed differential pressure sensor senses the pressure differential across the filters. When the differential pressure exceeds a user selectable setting will display a diagnostic. The unit will continue to run until you replace the air filters.
Supply Air Static Pressure High Limit
During normal operation, the Supply Air Static is monitored. If at any time the static pressure exceeds the software high static limit (defaulted at 2.0 inches from the factory) the unit will immediately shut down and generate a diagnostic.
In order for the unit to resume operation, the Alarm Reset must be toggled from the TD-7. The software high static limit can be user adjusted at the TD-7.
Airside Components
Two-Position Damper Interface
Units with two-position damper ventilation interface are equipped with the necessary control sequences to allow opening of a two-position outdoor air damper to deliver ventilation air to the return air stream of the unit.
When the unit is in the occupied mode and the supply fans are running, a binary output will turn on sending 24 Vac to the two-position damper to allow ventilation air into the unit.
Airside Economizer Interface with OA Reference
Units with airside economizer interface are equipped with the necessary control sequences to allow using outside air for the first stage of cooling, in occupied or unoccupied mode and when ambient conditions are favorable for economizing. Inherent in the unit controller is the ability to suppress the setpoint below the normal unit setpoint. This allows the building to improve comfort levels when possible, and at the same time, optimize building mechanical cooling operation for peak operating efficiency. An outside air temperature and relative humidity sensor are field sourced and installed.
Economizer operation enables when the outside air enthalpy is less than 25 BTU's/lb. (adjustable 19 to 28 BTU's/lb). During occupied mode, the outside air damper opens to 15 percent (adjustable 0 to 50%) for ventilation purposes. An analog 2 to 10 Vdc output is provided to modulate the field-provided and installed damper actuators.
Airside Economizer Interface with Comparative Enthalpy
Units with airside economizer interface and comparative enthalpy are equipped with the necessary control
PKG-SVX029A-EN

sequences to allow using outside air for the first stage of cooling, in occupied or unoccupied mode and when ambient conditions are favorable for economizing. Inherent in the unit controller is the ability to suppress the setpoint below the normal unit setpoint. This allows the building to improve comfort levels when possible, and at the same time, optimize building mechanical cooling operation for peak operating efficiency. Outdoor and Return Air

Operating Principles
temperature and relative humidity sensors are field sourced and installed.
Economizer operation enables when the outside air enthalpy is 3 BTU's/lb. less than the return air enthalpy. During occupied mode, the outside air damper opens to 15 percent(adjustable 0 to 100%) for ventilation purposes. An analog 2 to 10 Vdc output is provided to modulate the field provided and installed damper actuators.

PKG-SVX029A-EN

Controls
Unit Controller
The SWUD uses the SymbioTM 500 control platform for monitoring and control. XM expansion modules are used to expand the Symbio 500 I/O capabilities.
In the control panel, the following modules are used:
· Symbio 500
· TD-7

· XM90.1 · XM30.2 · XM30.3 · XM30.4 Note: The number after the dot in the name (example:
XM30.#) is the IMC bus address, which is set using the rotary switches on the module.

PKG-SVX029A-EN

Table 12. Points list

Hardware Connection BO1

BO2

BO3

BO4

BO5

BO6

BO7

BO8

BO9

AI1

Symbio 500

AI2

(Requires 50VA

AI3

Transformer)

AI4

AI5

UI1

UI2

BI1

BI2

BI3

AO1/BI4

AO2/BI5

PI1

PI2

Point Name Cooling Tower Pump Request Unit Alarm Output Command
VAV Box Command Open Compressor 1 Command Compressor 2 Command Compressor 3 Command Compressor 4 Command Supply Fan Start Stop Command Supply Fan Start Stop Command 2 Discharge Air Temperature Return Air Temperature Local Condenser Water Entering Temperature Condenser Water Leaving Temperature Evaporator Coil Leak Detector Signal
Occupancy Input Space Tempertaure Sensor
Emergency Stop Circuit 1 High Pressure Cutout Circuit 2 High Pressure Cutout
Ventilation Input Status Outdoor Air Damper Command
Duct Static Pressure Local Air Filter Differential Pressure

Controls
Point Setup Open = Off, Closed = On Open Normal, Closed = Alarm Open =Normal Operation, Closed = Drive Max Position Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On 10k Ohm Resistor Trane Type 2 10k Ohm Resistor Trane Type 2 10k Ohm Resistor Trane Type 2 10k Ohm Resistor Trane Type 2 Open = Normal, Closed = Leak Open = Unoccupied, Closed = Occupied 10k Ohm Resistor Trane Type 2 Open = Normal, Closed = Emergency Stop Open = Alarm, Closed = Normal Open = Alarm, Closed = Normal Open = Normal, Closed = Ventillation Mode 2 vdc = 0%, 10 vdc = 100% Honeywell Pressure Sensor Honeywell Pressure Sensor

PKG-SVX029A-EN

Controls

Table 12. Points list (continued)

Hardware Connection

BO1

BO2

BO3

BO4

BO5

BO6

BO7

BO8

UI1

UI2

UI3

UI4

UI5

UI6

XM9.1 (Requires 50VA
Transformer)

UI7 UI8 UI9 UI10

UI11

UI12

UI13

UI14

UI15

UI16

AO1/UI17

AO2/UI18

AO3/UI19

AO4/UI20

AO5/UI21

AO6/UI22

AO7/UI23

AO8/UI24

AO1/UI1

XM30.2 XM30.3

AO2/UI2 AO3/UI3 AO4/UI4 AO1/UI1 AO2/UI2 AO3/UI3 AO4/UI4

AO1/UI1

XM30.4

AO2/UI2 AO3/UI3 AO4/UI4

Point Name Heat Output 1 Heat Output 2 Heat Output 3 Outdoor Air Damper (2 Position) Supply Fan Status Output
-- -- -- Compressor 1 Safety Circuit Status Compressor 2 Safety Circuit Status Compressor 3 Safety Circuit Status Compressor 4 Safety Circuit Status Circuit 1 Suction Temperature Circuit 1 Discharge Pressure Sensor Circuit 1 Suction Pressure Sensor Circuit 2 Discharge Pressure Sensor Circuit 2 Suction Pressure Sensor Circuit 2 Suction Temperature Supply Fan 1 ECM Fault Supply Fan 2 ECM Fault Supply Fan 3 ECM Fault Supply Fan 4 ECM Fault Condenser Water Flow Switch External Auto Stop Input Status Compressor Coil Leak Detector Signal Supply Fan 1 Speed Command Supply Fan 2 Speed Command Supply Fan 3 Speed Command Supply Fan 4 Speed Command Condenser Water Valve Heating Output 1 Command Phase Monitor Status Supply Fan 5 ECM Fault
Supply Fan 5 Speed Command Supply Fan 6 ECM Fault
Supply Fan 6 Speed Command Supply Fan 7 ECM Fault
Supply Fan 7 Speed Command -- --
Outdoor Air Temperature Local
Outdoor Air Relative Humidity Local Return Air Humidity Local
Mixed Air Low Temperature Cutout Alarm

Point Setup Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On Open = Off, Closed = On
-- -- -- Open = Circuit Open, Closed = Circuit Closed Open = Circuit Open, Closed = Circuit Closed Open = Circuit Open, Closed = Circuit Closed Open = Circuit Open, Closed = Circuit Closed 10k Ohm Resistor Trane Type 2 0.5 Vdc = 0 PSI, 4.5Vdc = 667 PSI 0.5 Vdc = 0 PSI, 4.5Vdc = 667 PSI 0.5 Vdc = 0 PSI, 4.5Vdc = 667 PSI 0.5 Vdc = 0 PSI, 4.5Vdc = 667 PSI 10k Ohm Resistor Trane Type 2 Open = Normal, Closed = Fault Open = Normal, Closed = Fault Open = Normal, Closed = Fault Open = Normal, Closed = Fault Open = No Flow, Closed = Flow Open = Auto, Closed = Exterior Stop Open = Normal, Closed = Leak 0 vdc = 0%, 10 vdc = 100% 0 vdc = 0%, 10 vdc = 100% 0 vdc = 0%, 10 vdc = 100% 0 vdc = 0%, 10 vdc = 100% 0 vdc = 0%, 10 vdc = 100% 0 vdc = 0%, 10 vdc = 100% Open = Fault, Closed = Normal
Open = Normal, Closed = Fault (only on units 85 tons and above)
0 vdc = 0%, 10 vdc = 100% Open = Normal, Closed = Fault
0 vdc = 0%, 10 vdc = 100% Open = Normal, Closed = Fault (only on 110 ton units)
0 vdc = 0%, 10 vdc = 100% -- --
10k Ohm Resistor Trane Type 2 (only on units with economizer interfaces)
4 ma = 0, 20 ma = 100% 4 ma = 0, 20 ma = 100%
Open = Alarm

PKG-SVX029A-EN

Controls

Navigating the TD-7

TD-7 Home Screen
To access the TD-7 home screen, press the Home button in the upper left of the screen.

Screen Element
A B C D E F G H
I
J

Description
Home button
Displays the local Auto Stop button and displays the occupancy, Heat/Cool Mode, and Unit Information.
Displays information about the Air Filter.
Displays the Discharge Air Temperature, Setpoint, and Return Air Temperature. A red light displays if the sensor fails.
Displays when cooling is active and indicates the % of cooling capacity currently utilized. The Water Side Econ Info tile is included on units with an economizer installed. Displays a snapshot of economizer operations and the mode of the economizer. Displays fan status (on, off), duct static pressure setpoint and actual, and fan percentage. Compressor 1 is always the lead compressor. This tile displays the compressor pressures, superheat, VFD signal, condenser water values (if included), and operating mode. Tiles for compressors 2-4 display, depending on the number of compressors installed. The VFD compressor is always the lead compressor. The fixed speed compressors rotate to even out run time. Compressor tiles displays the compressor pressures, superheat, VFD signal, condenser water values (if included), and operating mode. Displays the entering and leaving temperatures, pump command, flow status, and the condenser alarm status.

TD-7 Reports
Unit Status Report
The Unit Status report provides an overview of how the unit is running and includes all available points that were predefined for the unit. To access the Unit Status report: 1. Press the Reports button at the bottom of the screen. 2. Press Unit Status button. Use the up and down arrows in the bottom right to scroll through the report. Figure 17. Unit status report
All Points Report
The All Points report provides details for all points for a unit. To access the All Points report: 1. Press the Reports button at the bottom of the screen. 2. Press the All Points Report button. Use the up and down arrows in the bottom right to scroll through the report.

Figure 18. All points report
Starting the Unit
Before starting the unit, confirm: · All checks are complete · Alarms are cleared · Compressors that you want to run are made available
or locked out.
Local Auto/Stop Value
The Local Auto/Stop Value is used to stop by unit in a safe manner either locally in Tracer TU or at the TD-7 display. The factory default is set to Auto. 1. Navigate to the Home screen. 2. In the upper left tile, press the arrow next to either Stop
or Auto. 3. To stop the unit, press the Stop button, or to put the
unit in Auto default mode, press Release Override.

PKG-SVX029A-EN

Controls
Figure 19. Local Auto/Stop
Figure 20. Stop or release override

Setpoint Adjustments
This section details control setpoints that can be modified from factory defaults and how to modify those setpoints.
Unit Setpoints

Table 13. Unit setpoints that can be modified in the TD-7

Setpoint Name
Condenser Purge Time (on units with condenser valves only)

Description
The amount of time (in minutes) that the compressor will open its condenser valve during purge mode when the unit is not operating.

Factory Default 20 minutes

Discharge Air Cooling Setpoint BAS

Used as the cooling setpoint on fixed setpoint units and on units that reset their discharge air temperature setpoint as the low value in the reset equation. This value should be set to the desired temperature needed for startup.

55°F

Discharge Air Cooling Setpoint Max BAS (reset DAT units only)
Discharge Air Heating Setpoint BAS (Units with Heat Only)
Discharge Air Low Temperature Cutout
Duct Static Pressure Setpoint BAS
Duct Static Pressure Safety Lockout
Dirty Air Filter DP
Occupied Offset (DAT Reset Units Only)
Occupied Standby Offset (DAT Reset Units Only)

Sets the upper limit in the Reset Equation in Cooling Mode. This value can be adjusted to the desired maximum setpoint the discharge air should reach during cooling mode.
Used as the heating setpoint when the unit is in heating mode. This value should be set to the desired temperature needed for startup.
Value that triggers a diagnostic when the discharge air temperature is below this value for 10 minutes. This value can be adjusted to the desired low air temperature, which triggers the diagnostic.
The duct static pressure setpoint is set by the analog value named duct static pressure setpoint BAS. This value should be set to the desired pressure needed for startup.
Shuts down the unit if the duct static exceeds this setpoint. It should be set to the desired pressure needed for startup. Generates a diagnostic for a dirty air filter when the differential pressure exceeds the setpoint. Determines the occupied cooling and heating setpoints when the unit resets the discharge air temperature off either return or space temperature.
Determines the occupied cooling and heating setpoints when the unit resets the discharge air temperature off either return or space temperature and is the occupied standby mode.

65°F 90°F 35°F
1 in (H2O) 2 in (H2O) 10 in (H2O)
2°F 4°F

Space Temperature Setpoint BAS (DAT Reset by Space Temp Air Units Only)

Sets the space setpoint when the unit is selected to do discharge air reset based off the space temperature. This value is used to determine the occupied heating and cooling temperatures which reset the discharge air temperature setpoint.

72°F

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Controls

Table 13. Unit setpoints that can be modified in the TD-7 (continued)

Setpoint Name

Description

Factory Default

Return Temperature Setpoint BAS (DAT Reset by Return Temp Air Units Only)

Sets the return setpoint when the unit is selected to do discharge air reset based off the return temperature. This value is used to determine the occupied heating and cooling temperatures which reset the discharge air temperature setpoint.

72°F

Water Side Economizer Enable Offset (Units with Water Side Economizer Only)

The temperature that the condenser entering water must be below the return air temperature before it will enable the economizer.

7°F

Water Side Economizer Sample Time (Units with Water Side Economizer Only)

Time that the controller will sample the water temperature for and compare it against the return air temperature to determine if the economizer can be enabled.

2 minutes

To modify any of the setpoints in the table above:
1. Press Reports at the bottom of the screen. 2. Press the Unit Setpoints button. 3. On the Setpoint report, locate the point in the menu.
Use the arrows to scroll through the report if needed.

4. Use the up and down arrows to change the value, or press inside the box and type in the desired setpoint.
5. Press Save.
Unit Setup

Table 14. Unit setup setpoints that can be modified in the TD-7

Setpoint Name Condenser Control % of Design
Condenser Tee Strainer Sensor Calibration
Condenser Purge Status (On Units with Condenser Valves Only)

Description
Percent of the condenser pressure design the unit will control to and is user adjustable between 50-100%. The condenser water tee high and low pressure sensor can be calibrated to match the gauge readings or recorded readings by the balancer.
Each compressor has its own condenser purge status value which indicates when the condenser valve is open in the purge mode. It can also be used to manually initiate the purge mode for each compressor.

Factory Default
90%
0
Off

Condenser Water Flow Type (On Units with Condenser Valves Only)

Indicates if the unit is a constant or variable volume flow type unit. Even with the condenser water regulating valves installed on each compressor, the flow type can be changed. When the flow is changed from variable flow to constant flow, the water regulating valve will open to its maximum position when the unit is occupied. This can be done for constant volume flow systems that do not include a VFD Pump.

Variable flow

Water Side Economizer Lockout BAS (Units with Water Side Economizer Only) Compressor Lockout BAS
Fan Lockout BAS

The water side economizer can be locked out by the controls system.
Each compressor can be locked out individually by the controls system. Each fan can be locked out individually by the controls system. Fans should be made available prior to startup.

Available Available Available

To modify any of the setpoints in the table above: 1. Press Reports at the bottom of the screen. 2. Press the Unit Setup button. 3. On the Setup report, locate the point in the menu. Use
the arrows to scroll through the report if needed. 4. Use the up and down arrows to change the value, or
press inside the box and type in the desired setpoint. 5. Press Save.
Reports
To access Alarms, press the Alarms button in the lower left corner of the screen. If the Alarm tab is not blinking red, there are no alarms present.
Figure 21. Alarms tab

Compressor Alarms
If there is a compressor alarm, it will need to be manually reset after it is resolved. Each compressor needs to be reset manually:
1. Press Reports at the bottom of the display. 2. Press Unit Setup. 3. In the Setup report, locate the appropriate point. Use
the arrows to scroll through the report if needed.
4. Select the specific compressor.
5. Change the value from Normal to Reset. 6. Press Save. The point will automatically revert to its
default setting (Off).
Fan Alarms
If there is a fan alarm, it will need to be manually reset after it is resolved. There is one fan reset for the entire wall fan.

PKG-SVX029A-EN

Controls
1. Press Reports at the bottom of the display. 2. Press Unit Setup. 3. In the Setup report, press Supply Fan Failure Reset.
Use the arrows to scroll through the report if needed. 4. Press Reset. 5. Press Save. 6. When you want the fan to be available, press the
Release Override button in the top left.
General Alarms
General alarms are alarms that are not tied to fans or compressors. They require a manual reset, and there is one alarm reset for these alarms. To reset a general alarm: 1. Press Reports at the bottom of the display. 2. Press Unit Setup. 3. In the Setup report, press Alarm Reset. Use the
arrows to scroll through the report if needed. 4. Press Reset. 5. Press Save.

Water Purge
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water could result in scaling, erosion, corrosion, algae or slime. Use the services of a qualified water treatment specialist to determine what water treatment, if any, is required. Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.
During the unoccupied mode, water-cooled units will periodically circulate water through the condensers and waterside economizer if the user has enabled the purge function at the HI. The water purge function circulates water to introduce fresh water-treatment chemicals and help prevent water stagnation. The number of hours between each periodic purge, or purge duration, is userdefined at the HI between 1-999 hours. If the periodic purge timer expires while the unit is in occupied mode, it will wait for the next available unoccupied time before initiating water purge.
Contrary, if a request for cooling occurs during a purge sequence, purge will terminate and cooling will commence.

PKG-SVX029A-EN

Pre-Startup
Before starting up units, perform the following procedure to confirm proper unit operation.
Pre-Startup Checklist
Complete this checklist after installing unit to verify all recommended installation procedures are complete before start-up. This does not replace the detailed instructions in the appropriate sections of this manual. Always read the entire section carefully to become familiar with the procedures.
Supply Fan
Confirm the fan rotates freely.
Ductwork
· Confirm trunk ductwork to VAV boxes is complete and secure to prevent leaks.
· Verify that all ductwork conforms to NFPA 90A or 90B and all applicable local codes.

Water-Cooled Unit Piping
Verify condensate drain, water piping drain plugs, economizer header, strainer pressure transducers, and condenser vent plug are installed.
Units with Hydronic Heat
Verify the entering water temperature sensor is installed upstream of the hydronic coil.
Electrical
Verify electrical connections are tight.
Components
· Verify liquid line service valve, and suction and discharge service valves if present, are open at startup. Note: Each compressor suction line contains a low pressure sensor that will shut the compressor down in low pressure situations.
· Confirm system components are properly set and installed.

PKG-SVX029A-EN

Start-Up
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When it is necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks.
NOTICE
Compressor Damage!
Failure to follow instructions below will cause the compressor to operate in a vacuum and result in compressor damage. Never manually or automatically pump down system below 7 psig.
NOTICE
Compressor Damage!
Failure to follow instructions could result in compressor damage. Keep crankcase heaters on whenever refrigerant is in the system. If crankcase heaters have not been on with refrigerant in the system, turn the crankcase heaters on for a minimum of 24 hours before starting compressors.
To start the unit, complete the following steps in order.
Review "Refrigerant System," p. 22, if applicable. Confirm all steps were completed.
Final Refrigerant Charge
If full charge was not used during installation, follow these steps:
1. Determine remaining charge required by subtracting charge added during "Refrigerant System," p. 22 from the total.
2. With all circuit compressors running, SLOWLY meter remaining R-454B into the suction line from the LIQUID charging connection.
NOTICE
Compressor Damage!
Overcharging system could result in compressor failure and/or reduced compressor life. Do not overcharge system. Excessive refrigerant charging can cause compressor liquid slugging at startup, and conditions where compressors and/or condenser fans short cycle.
42

NOTICE
Compressor Damage!
Failure to follow instructions below could result in compressor failure and/or reduced compressor life. To prevent compressor liquid slugging, only add liquid in the suction line when the compressor is running. Use extreme caution to meter liquid refrigerant into the suction line slowly. If liquid is added too rapidly, compressor oil dilution and oil pumpout could occur.
3. Use an accurate scale to measure and record amount of R-454B added.
4. After unit has been operating for approximately 30 minutes at full load, measure and record operating pressures.
5. Repeat for other circuits.
6. Confirm, and adjust charge, if necessary, by checking subcooling at AHRI 340/360 full load operating conditions (80°/67°F db/wb entering evaporator, ~300 cfm/ton, 85°/95°F EWT/LWT).
Some TXV superheat adjustment may be necessary, but only, after adequate subcooling has been reached. Note: Water-cooled subcooling should be 10.5°F to
12.5°F.
Start-Up Procedure
Using the start-up log on the following pages, establish nominal conditions for consistent measurements as follows:
· Leaving air greater than 60°F
· Entering air temperature = 70 to 90°F
· Entering water temperature > 60°F
With all compressors running at full load:
1. Compute superheat from the suction line pressure and temperature at the compressor on each circuit. Adjust the thermal expansion valve settings if necessary. Superheat should be between 14°F and 20°F.
2. Inspect refrigerant flow in the liquid line sight glass. Flow should be smooth and even, with no bubbles once the system has stabilized. Note: Sight glass moisture indicator may show caution or wet at start-up. May need up to 12 hours of operation for system to reach equilibrium and correctly show moisture.
Normal startup will occur provided Tracer® Summit is not controlling the module outputs or the generic BAS is not keeping the unit off. To prevent Tracer Summit from affecting unit operation, remove Tracer wiring and make required changes to setpoint and sensor sources.
PKG-SVX029A-EN

Operating and Programming Instructions
See IntelliPakTM Commercial Self-Contained Signature Series 20 to 110 Ton, Modular Series 20 to 35 Ton Programming Guide (PKG-SVP01*-EN) for available unit operating setpoints and instructions. A copy ships with
Unit:
Unit Location:
Unit Voltage

Start-Up
each unit. For units with VFD option, see installer guide that ships with each VFD.
Start-Up Log

Evaporator fan motor horsepower:
Evaporator fan motor amps:
Evaporator fan rpm (actual):
Evaporator system static (from test and balance report or actual readings)
Evaporator system cfm (test and balance sheet or actual tested):

Evaporator Supply duct static:

Return duct static:

Dry-bulb °F: Wet-bulb °F:

Evaporator Air Conditioners (with all compressor operating)

Entering

Leaving

Dry-bulb °F:

Wet-bulb °F:

Entering water temp °F
Leaving water temp °F
Entering water pressure psig
Leaving water pressure psig

Circuit A

Water-Cooled Units Circuit B

Circuit C

Circuit D

PKG-SVX029A-EN

Maintenance
Service Access
All service accessible areas are provided with hinged doors that allow doors to swing open or be removed completely.
To use as a hinge, simply open hinge handle, depress Y latch and swing door open.
To remove completely, open hinge handle and depress Y latch on back side of hinge. Work door off of unit being careful to not drop door.
Note: Evaporator door is 75 lbs and requires two-man lift to remove safely.
Access unit controls through the front. The panel is secured with two quick release hinges. Hinged panels allow access to the fans and also the compressor and condensers. Hinges also allow for complete removal of panel. Left and right hinges allow for access to evaporator section and also allow for removable of the entire panel. Expansion valves and filter driers are easily accessible from here. Filters are accessible via a hinged panel.
Power is accessible through a hinged door on the unit (left hand is standard and right hand is optional). Hinge also allows for panel to be removed.

Air Filters
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.
Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

Filter access doors are shared with the evaporator cassette access door. To replace throwaway filters, remove the dirty elements and install new filters with the filter directional arrows pointing toward the fan. Verify no air bypasses the filters. See Table 15, p. 44 for proper filter placement.

Table 15. Unit filter sizes

Unit size

Qty

Filter size

20 to 35

40 to 60 65 to 85

12 20 x 24 inches
15

90 to 110

Inspecting and Cleaning the Drain Pan
Check the condensate drain pan and drain line to confirm the condensate drains properly at least every six months or as dictated by operating experience.
If evidence of standing water or condensate overflow exists, take steps to identify and remedy the cause immediately. Refer to the "Troubleshooting," p. 52 for possible causes and solutions.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer's literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
Clean drain pans using the following procedure:
1. Disconnect all electrical power to the unit.
2. Don the appropriate personal protective equipment (PPE).
3. Remove all standing water.
4. Use a scraper or other tools to remove and solid matter. Remove solid matter with a vacuum device that utilizes high efficiency particulate arrestance (HEPA) filters with a minimum efficiency of 99.97% at 0.3 micron particle size.
5. Thoroughly clean the contaminated area(s) with a mild bleach and water solution or an EPA-approved sanitizer specifically designed for HVAC use. Carefully follow the sanitizer manufacturer's instructions regarding product use.
6. Immediately rinse the drain pan thoroughly with fresh water to prevent potential corrosion from the cleaning solution.
7. Allow the unit to dry thoroughly before putting the system back into service.
8. Properly dispose of all contaminated materials and cleaning solution.

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Compressors
Scroll Compressor Failure Diagnosis and Replacement
If compressor failure is suspected, refer to CSHD and CSHN/CSHL Compressors Installation and Service Installation Instructions (COM-SVN01*-EN) for detailed information regarding compressor failure diagnosis and replacement of scroll compressors.
Refrigerant System
If refrigerant system repair is required, Leak Test, Brazing and Evacuation Procedures are described. Preliminary charging is described in the Installation Mechanical section, "Refrigerant System," p. 22 and final charging is described in the Start-Up section, "Final Refrigerant Charge," p. 42. Refrigerant systems that have been opened must have filter driers replaced and complete leak test and evacuation before recharging. Unit is equipped with replaceable filter core option for easy maintenance.
Refrigerant Leak Test Procedure
WARNING
Confined Space Hazards!
Failure to follow instructions below could result in death or serious injury. Do not work in confined spaces where refrigerant or other hazardous, toxic, or flammable gas may be leaking. Refrigerant or other gases could displace available oxygen to breathe, causing possible asphyxiation or other serious health risks. Some gases may be flammable and/or explosive. If a leak in such spaces is detected, evacuate the area immediately and contact the proper rescue or response authority.
WARNING
Explosion Hazard!
Failure to follow safe leak test procedures below could result in death or serious injury or equipment or property-only-damage. Never use an open flame to detect gas leaks. Use a leak test solution for leak testing.
PKG-SVX029A-EN

Maintenance
WARNING
Explosion Hazard!
Failure to follow these instructions could result in death or serious injury or equipment or property-only damage. Use only dry nitrogen with a pressure regulator for pressurizing unit. Do not use acetylene, oxygen or compressed air or mixtures containing them for pressure testing. Do not use hydrogen mixtures containing refrigerant and air above atmospheric pressure for pressure testing as they may become flammable and could result in an explosion. Refrigerant, when used as a trace gas should only be mixed with dry nitrogen for pressurizing units.
WARNING
Explosion Hazard!
Failure to follow instruction below could result in death or serious injury. Do not exceed unit nameplate design pressures when leak testing system.
WARNING
Refrigerant under High Pressure!
Failure to follow instructions below could result in an explosion which could result in death or serious injury or equipment damage. System contains refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives.
Note: These service procedures require working with refrigerant. Do not release refrigerant to the atmosphere. The service technician must comply with all federal, state, and local laws.
When leak-testing refrigerant systems, observe all safety precautions. Leak test only one circuit at a time to minimize system exposure to potentially harmful moisture in the air.
System Repair
1. Connect R-454B refrigerant cylinder to charging port, add refrigerant to reach pressure of 12 to 15 psig.
2. Disconnect refrigerant cylinder. Connect dry nitrogen cylinder to high side charging port and increase pressure to 150 psig. DO NOT exceed unit nameplate design pressures. If testing complete system, low side design pressure is maximum.
3. Check piping and/or components as appropriate for leaks.
4. Recommend using electronic detector capable of measuring 0.1 oz/year leak rate.
5. If a leak is located, use proper procedures to remove
45

Maintenance
the refrigerant/nitrogen mixture, break connections and make repairs. Retest for leaks.
6. Confirm all service valves are open.
Brazing Procedures
WARNING
Explosion Hazard and Deadly Gases!
Failure to follow all proper safe refrigerant handling practices could result in death or serious injury. Never solder, braze or weld on refrigerant lines or any unit components that are above atmospheric pressure or where refrigerant may be present. Always remove refrigerant by following the guidelines established by the EPA Federal Clean Air Act or other state or local codes as appropriate. After refrigerant removal, use dry nitrogen to bring system back to atmospheric pressure before opening system for repairs. Mixtures of refrigerants and air under pressure may become combustible in the presence of an ignition source leading to an explosion. Excessive heat from soldering, brazing or welding with refrigerant vapors present can form highly toxic gases and extremely corrosive acids.
Proper brazing techniques are essential when installing refrigerant piping. The following factors should be kept in mind when forming sweat connections:
1. When heating copper in the presence of air, copper oxide forms. To prevent copper oxide from forming inside the tubing during brazing, sweep an inert gas, such as dry nitrogen, through the tubing. A nitrogen flow of 1 to 3 cubic feet per minute is sufficient to displace the air in the tubing and prevent oxidation of the interior surfaces. Use a pressure regulating valve or flow meter to control the flow.
2. Confirm the tubing surfaces requiring brazing are clean, and that the tube ends are carefully reamed to remove any burrs.
3. Confirm the inner and outer tubes of the joint are symmetrical and have a close clearance, providing an easy slip fit. If the joint is too loose, the connection tensile strength is significantly reduced. Confirm the overlap distance is equal to the inner tube diameter.
4. Wrap each refrigerant line component with a wet cloth to keep it cool during brazing. Excessive heat can damage the internal components. Note: Use 40-45% silver brazing alloy (BAg-7 or BAg28) on dissimilar metals. Use BCup-6 brazing alloy on copper-to-copper joints.
5. If using flux, apply it sparingly to the joint. Excess flux will contaminate the refrigerant system.
6. Apply heat evenly over the length and circumference of the joint.
7. Begin brazing when the joint is hot enough to melt the brazing rod. The hot copper tubing, not the flame,
46

should melt the rod.
8. Continue to apply heat evenly around the joint circumference until the brazing material is drawn into the joint by capillary action, making a mechanically sound and gas-tight connection.
9. Visually inspect the connection after brazing to locate any pinholes or crevices in the joint. Use a mirror if joint locations are difficult to see.
System Evacuation Procedures
· Each refrigeration circuit must be evacuated before the unit can be charged and started.
· Use a rotary type vacuum pump capable of pulling a vacuum of 100 microns or less.
· Verify that the unit disconnect switch and the system control circuit switches are OFF.
· Oil in the vacuum pump should be changed each time the pump is used with high quality vacuum pump oil. Before using any oil, check the oil container for discoloration, which usually indicates moisture in the oil and/or water droplets. Moisture in the oil adds to what the pump has to remove from the system, making the pump inefficient.
· When connecting vacuum pump to refrigeration system, it is important to manifold vacuum pump to both high and low side of system (liquid line access valve and suction line access valve). Follow pump manufacturer's directions for proper methods of using vacuum pump.
· Lines used to connect the pump to the system should be copper and of the largest diameter that can practically be used. Using larger line sizes with minimum flow resistance can significantly reduce evacuation time.
· Rubber or synthetic hoses are not recommended for system evacuation. They have moisture absorbing characteristics that result in excessive rates of evaporation, causing pressure rise during standing vacuum test. This makes it impossible to determine if system has a leak, excessive residual moisture, or continual or high rate of pressure increase due to hoses.
· Install an electronic micron vacuum gauge in the common line ahead of the vacuum pump shutoff valve, as shown in Figure 22, p. 47. Close valves B and C, and open Valve A.
· Start vacuum pump. After several minutes the gauge reading will indicate the maximum vacuum the pump is capable of pulling. Rotary pumps should produce vacuums of 100 microns or less.
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Maintenance

NOTICE
Motor Winding Damage!
Failure to follow instructions below could result in compressor motor winding damage. Do not use a megohm meter or apply voltage greater than 50 VDC to a compressor motor winding while it is under a deep vacuum.
· Open valves B and C. Evacuate system to a pressure of 300 microns or less. As vacuum is being pulled on system, it may appear that no further vacuum is being obtained, yet pressure is high. It is recommended during evacuation process to break vacuum to facilitate evacuation.
· To break the vacuum, shut valves A, B, and C and connect a refrigerant cylinder to charging port on manifold. Purge air from hose. Raise standing vacuum pressure in system to zero (0 psig) gauge pressure. Repeat process two or three times during evacuation.
Note: It is unlawful to release refrigerant into the atmosphere. When service procedures require working with refrigerants, the service technician must comply with all Federal, State, and local laws.
Standing Vacuum Test
Once 300 microns or less is obtained, close valve A and leave valves B and C open to allow the vacuum gauge to read the actual system pressure. Let system equalize for approximately 15 minutes. This is referred to as a standing

vacuum test where time versus pressure rise. Maximum allowable rise over a 15 minute period is 200 microns. If pressure rise is greater than 200 microns but levels off to a constant value, excessive moisture is present. If pressure steadily continues to rise, a leak is indicated. Figure 23, p. 47 illustrates three possible results of standing vacuum test.
If a leak is encountered, repair the system and repeat the evacuation process until the recommended vacuum is obtained. Once the system has been evacuated, break the vacuum with refrigerant and complete the remaining PreStart procedures before starting the unit.
Figure 22. Typical vacuum pump hookup

Figure 23. Evacuation time vs. pressure rise
1600
1400

Continously increasing pressure indicates the presence of leaks, moisture, or both.

1200 1000
800

State of equilibrium indicates the true amount of moisture left in the system. It indicates that no leaks, but requires further evacuation.

Pressure in Microns

600
400
Initial evacuation pressure.
200

State of equilibrium indicates the true amount of moisture left in the system. It indicates that no leaks are present and the system is properly evacuated.

-10

Time in Minutes

PKG-SVX029A-EN

Maintenance
Compressors
Scroll Compressor Failure Diagnosis and Replacement
If compressor failure is suspected, refer to CSHD and CSHN/CSHL Compressors Installation and Service Installation Instructions (COM-SVN01*-EN) for detailed information regarding compressor failure diagnosis and replacement of scroll compressors.
Components
Cleaning Coil Fin
WARNING
Hazardous Chemicals!
Failure to follow this safety precaution could result in death or serious injury. Coil cleaning agents can be either acidic or highly alkaline and can burn severely if contact with skin or eyes occurs. Handle chemical carefully and avoid contact with skin. ALWAYS wear Personal Protective Equipment (PPE) including goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For personal safety refer to the cleaning agent manufacturer's Materials Safety Data Sheet and follow all recommended safe handling practices.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
NOTICE
Coil Damage!
Failure to follow instructions below could result in coil damage. Do not clean the refrigerant coil with hot water or steam as it could cause high pressure inside the coil tubing. Do not use acidic chemical coil cleaners. Also, do not use alkaline chemical coil cleaners with a pH value greater then 8.5 (after mixing) without using an aluminum corrosion inhibitor in the cleaning solution.
· Keep coils clean to maintain maximum performance. For operation at its highest efficiency, clean the refrigerant coil often during periods of high cooling
48

demand or when dirty conditions prevail. Clean the coil a minimum of once per year to prevent dirt buildup in the coil fins, where it may not be visible.
· Remove large debris from the coils and straighten fins before cleaning. Remove filters before cleaning.
· Clean refrigerant coils with cold water and detergent, or with one of the commercially available chemical coil cleaners. Rinse coils thoroughly after cleaning.
· Economizer and evaporator coils are installed so the evaporator is directly behind the economizer. To clean between the coils, remove the sheet metal block off. Access the block off by removing the corner panels on the left or right rear side of the unit.
· If the refrigerant coil is installed back to back with the waterside economizer coil, use a cleaner that is acceptable for cleaning both types of coils.
Inspecting and Cleaning Coils
Coils become externally fouled as a result of normal operation. Coil surface dirt reduces heat transfer ability and can cause comfort problems, increased airflow resistance and thus increased operating energy costs.
Inspect coils at least every six months or more frequently as dictated by operating experience. Cleaning frequently is dependent upon system operating hours, filter maintenance, efficiency, and dirt load. Following is the suggested method for cleaning steam and hot water coils.
Hot Water Coils
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
1. Disconnect all electrical power to the unit.
2. Wear appropriate personal protective equipment (PPE).
3. Access both sides of the coil section.
4. Use a soft brush to remove loose debris from both sides of the coil.
5. Use a steam cleaning machine, starting from the top of the coil and working downward. Clean the leaving air side of the coil first, then the entering air side. Use a block-off to prevent steam from blowing through the coil and into a dry section of the unit.
6. Repeat Step 5 as necessary. Confirm that the drain line is open following completion of the cleaning process.
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7. Allow the unit to dry thoroughly before putting the system back into service.
8. Straighten any coil fins that may be damaged with a fin rake.
9. Replace all panels and parts and restore electrical power to the unit.
10. Confirm contaminated material does not contact other areas of the equipment or building. Properly dispose of all contaminated materials and cleaning solutions.
Refrigerant Coils
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
1. Disconnect all electrical power to the unit.
2. Wear the appropriate personal protective equipment (PPE).
3. Access to the coil section of the unit (both sides).
4. Use a soft brush to remove loose debris from both sides of the coil.
5. Mix a high quality coil cleaning detergent with water according to the manufacturer's instructions. If the detergent is strongly alkaline after mixing (pH 8.5 or higher), it must contain an inhibitor. Carefully follow the cleaning solution manufacturer's instructions regarding product use.
6. Place the mixed solution in a garden pump-up sprayer or high pressure sprayer. If using a high pressure sprayer note the following:
· Maintain a minimum nozzle spray angle of 15°.
· Spray perpendicular to the coil face.
· Protect other areas of the equipment and internal controls from contact with moisture or the cleaning solution.
· Keep the nozzle at least 6 inches from the coil.
· Do not exceed 600 psig.

Maintenance
Draining the Waterside Economizer Coil
NOTICE
Coil Freeze-Up!
Failure to follow instruction below could result in equipment damage. Drain and vent coils when not in use. Trane recommends glycol protection in all possible freezing applications. Use a glycol approved for use with commercial cooling and heating systems and copper tube coils.
Drain plugs are in the piping below supply and return header for each coil. Use these plugs to drain the coil and piping. When draining the coil, open the vents at the top of the supply and return headers. Also, a drain plug is at the bottom of the inlet condenser manifold and in the outlet pipe near the left side of the unit. Remove these plugs to drain the condensers. Be sure to open the vent plugs at the top of the condenser inlet and outlet manifold.
When refilling the condenser/waterside economizer coil system with water, provide adequate water treatment to prevent the formation of scale or corrosion.
Chemical Cleaning of Economizer Coil
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water could result in scaling, erosion, corrosion, algae or slime. Use the services of a qualified water treatment specialist to determine what water treatment, if any, is required. Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.
Chemical cleaning removes scale deposits built up by minerals in the water. For a suitable chemical solution, consult a water treatment specialist. The condenser water circuit is composed of copper, steel, and cast iron. The chemical supply house should approve or provide all materials used in the external circulating system, along with the quantity of cleaning material, duration of cleaning time, and safety precautions necessary for handling the cleaning agent.

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Maintenance
Piping Components
Water Valves
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer's literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
Water valves have a stern packing nut. If there is evidence of water leakage at the valve stem, proceed as follows:
1. Remove actuator motor from support plate.
2. Remove shaft coupling.
3. Torque the packing nut to 10-ft.-lbs. of torque.
4. Replace shaft coupling.
5. Replace actuator motor.
Water Flow Switch
A water flow switch is required to be installed in the condenser water pipe within the unit. It is a standard feature and supplied from the factory.
When the flow switch detects a water flow loss prior to or during mechanical cooling, the compressor operation locks out and a diagnostic code displays. If water flow is restored, the compressor operation automatically restores.

Maintenance Periodic Checklists
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.
Monthly Checklist
The following check list provides the recommended maintenance schedule to keep the commercial selfcontained equipment running efficiently.
1. Inspect unit air filters. Clean or replace if airflow is blocked or if filters are dirty.
2. Inspect coils for excess moisture or icing. Icing on the coils may indicate low airflow supply, restricted airflow from dirty fins, evaporator frost protection sensor problems, or a shortage of refrigerant flowing through the coil.
3. Check that condensate from the evaporator and economizer coils flows freely through the condensate piping, traps, drain pan, and drainage holes. Remove algae and or any airflow obstructions.
4. Check the liquid line sight glasses during operation. Bubbles in the sight glasses indicate a possible shortage of refrigerant or an obstruction in the liquid lines, e.g. dirty liquid line filter driers.
5. Inspect filter driers for leaks, flow obstructions, or temperature drop across the filter drier. A noticeable temperature differential, e.g. 5°F, in the liquid line may indicate an obstruction. Replace the filter drier if it appears clogged.
6. Inspect the optional waterside economizer coil. Clean the coil to prevent airflow restrictions through the fins.
7. Check and record operating pressures.

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Semi-Annual Maintenance
WARNING
Rotating Components!
Failure to disconnect power before servicing could result in rotating components cutting and slashing technician which could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized.
1. With power disconnected, manually rotate the fan wheel to check for obstructions in the housing or interference with fan blades. Remove obstructions and debris. Inspect for any damage to fan blades and housing. Check impeller for wear/deposits/corrosion and damage.
2. Check water valves for leakage at valve stem packing nut. Note: Perform this procedure monthly if the unit is in a coastal or corrosive environment.
Annual Maintenance
Check and tighten all set screws, bolts, locking collars and

Maintenance
sheaves.
1. Inspect, clean, and tighten all electrical connections.
2. Visually inspect the entire unit casing for chips or corrosion. Remove rust or corrosion and repaint surfaces.
3. Visually check for leaks in refrigerant piping.
4. Inspect fan, motor, and control contacts. Replace badly worn or eroded contacts.
5. Inspect the thermal expansion valve sensing bulbs for cleanliness, good contact with the suction line, and adequate insulation from ambient air.
6. Verify the superheat setting is 12°F to 17°F at the compressor.
When checking operating pressures and conditions, establish the following nominal conditions for consistent measurements.
· Leaving air temperature greater than 60°F.
· Entering air temperature is 80°F to 90°F.
· Entering water temperature greater than 65°F.
· Compressors running at full load.
· Drain the condensing water system and inspect it thoroughly for fouling; clean if necessary.

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Diagnostics

Troubleshooting
System Checks
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When it is necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks.
Before proceeding with technical trouble charts or controls checkout, complete the following system analysis:
1. Measure actual supply voltage at the compressor and an motor terminals with the unit running. Voltage must be within the range listed on the motor nameplate. Phase imbalance must be less than 2.0 percent.
2. Check all wiring and connections to be sure that they are intact, secure and properly routed. The as wired system diagrams are provided in the unit control panel.
3. Check that all fuses are installed and properly sized.
4. Inspect air filters and coils to be sure that airflow to the unit is not restricted.
5. Check the zone thermostat settings.
6. Confirm the fan is rotating in the proper direction. If phasing is wrong at the main power terminal block, the fan and compressors will not run correctly.
7. Inspect ductwork and duct connections for tightness.
Operating Procedures
Install pressure gauges on the discharge and suction line access valves. When the unit has stabilized (after operating approximately 15 minutes at full load), record suction and discharge pressures. System malfunctions such as low airflow, line restrictions, incorrect refrigerant

charge, malfunctioning of expansion valves, damaged compressors, etc. will result in pressure variations which are outside the normal range. Note: If phasing at the main incoming power terminal is
incorrect, switch two of the three incoming power leads. If a compressor has been replaced and the phase is changed at the compressor, it will run backwards and discharge pressure will be very low. To resolve incorrect compressor wire phasing, change phasing at the compressor.
It is important that pressures be measured under stable and constant conditions in order for the readings to be useful.
Voltage Imbalance
Voltage imbalance on three-phase systems can cause motor overheating and premature failure. Maximum allowable imbalance is 2.0 percent, and the readings used to determine it must be measured at the compressor terminals.
Voltage imbalance is defined as 100 times the sum of the division of the three voltages from the average voltage. If, for example, the three measured voltages are 221, 230, 227, the average is:

221 + 230 + 227 3

= 226 volts

Therefore, the percentage of voltage imbalance is:
100*(226-221)/226 = 2.2%
In this example, 2.2 percent imbalance of more than 2.0 percent exists, be sure to check the voltage at the unit disconnect and terminal block switch. If an imbalance at the unit disconnect switch does not exceed 2.0 percent, the imbalance is caused by faulty wiring within the unit. Be sure to conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.

Table 16. Potential unit issues and solutions

Problem

Possible Cause

Remedy

Drain pan is overflowing

Plugged drain line Unit not level

Clean drain line Level unit

Standing water in drain pan

Unit not level Plugged drain line

Level Unit Clean drain line

Wet interior insulation Excess dirt in unit

Coil face velocity too high Improper trap design Drain pan leaks/overflowing Condensation on
surfaces
Missing filters Filter bypass

Reduce fan speed Design trap per unit installation instructions Repair Leaks Insulate surfaces
Replace filters Reduce filter bypass

Microbial growth (mold)

Standing water in drain pan

See "Standing water in drain pan" above

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Notes

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Notes

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Notes

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Trane - by Trane Technologies (NYSE: TT), a global innovator - creates comfortable, energy efficient indoor environments for commercial and residential applications. For more information, please visit trane.com or tranetechnologies.com.

Trane has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

PKG-SVX029A-EN 25 May 2024 Supersedes (New)

References

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