Carrier MPW017-080 Multi Chiller Controller Accessory Installation Guide

Contents hide

1 Carrier MPW017-080 Multi Chiller Controller Accessory

2 Specifications

3 Installation

4 Configuring the Controller

5 Sequence of Operation

6 Troubleshooting

7 FAQs

8 Documents / Resources

8.1 References

Carrier MPW017-080 Multi Chiller Controller Accessory

Specifications

Model: MPW017-080
Part Number: 30MP70001401

Chiller Capacity: 2 to 8 chillers
Controller Type: TruVu controller board

Energy Efficiency: Reduces system energy consumption at part-load operating conditions

Installation

Installation of the 30MP multi-chiller controller accessory should only be performed by trained, qualified installers and service technicians. Follow the safety precautions provided in the literature and labels attached to the equipment.

Configuring the Controller

To configure the controller, follow the instructions provided in the manual for setting up points, properties, and scheduling. This will ensure efficient operation of the chiller plant.

Sequence of Operation

The sequence of operation includes scheduling and condenser water temperature control. Ensure proper settings for optimal performance.

Troubleshooting

If any issues arise, refer to the troubleshooting section in the manual. Pay attention to LEDs for indications and follow guidelines for obtaining serial numbers.

FAQs

Q: Can untrained individuals install the controller accessory?
A: No, installation should only be done by trained, qualified installers and service technicians due to safety considerations.

Q: How many chillers can the 30MP multi-chiller controller control?
A: The controller can control 2 to 8 chillers as a single chiller plant.

Q: How does the controller improve energy efficiency?
A: The controller stages each chiller independently, reducing system energy consumption at part-load operating conditions.

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30MPA, MPW017-080 Multi-Chiller Controller Accessory

Installation Instructions
Part No. 30MP70001401

Installation of this accessory can be hazardous due to system pressures, electrical components, and equipment location (such as a roof or elevated structure). Only trained, qualified installers and service technicians should install, start-up, and service this equipment.
When installing this accessory, observe precautions in the literature, labels attached to the equipment, and any other safety precautions that apply:
· Follow all safety codes
· Wear safety glasses and work gloves

· Use care in handling and installing this accessory
It is important to recognize safety information. This is the safetyalert symbol: . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
WARNING
Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and service. There may be more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53300273-01

Printed in U.S.A.

Form No. 30MP-6ASI

Pg 1

10-24

Replaces: 30MP-27SI

FCC Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
CAUTION
Changes or modifications not expressly approved by the responsible party for compliance could void the user’s authority to operate the equipment.
CE Compliance
This is a Class A product. In a domestic environment, this product may cause radio interference in which case the user may be required to take adequate measures.
BACnet1 Compliance
BACnet is a registered trademark of ASHRAE. ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to requirements of ASHRAE Standard 135 is the responsibility of BACnet International.
GENERAL
The 30MP multi-chiller controller is a field-installed accessory kit that is used to control 2 to 8 chillers as a single chiller plant. The units are controlled by the TruVu controller board inside the accessory panel. The 30MP multi-chiller controller allows for efficient operation by staging each chiller independently. This reduces system energy consumption at part-load operating conditions.
1. Third-party trademarks and logos are the property of their respective owners.

The multi-chiller controller accessory includes Carrier’s TruVu ET® display, which is an integrated component of the i-Vu BAS (Building Automation System).
The multi-chiller controller accessory also contains a power converter and terminal strip in a NEMA type 1 enclosure, which can be wall mounted. The kit requires field-supplied 120 vac, 100 va incoming power. The enclosure has multiple knockouts sized from 1/2 to 1-1/2 in. which allows for wiring to the terminal strip.
The following field-supplied items are required for installation:
· Varnish cloth
· Wire (22 AWG [American Wire Gauge], low capacitance, twisted, stranded, and shielded copper wire). Length should be up to 2000 ft to daisy chain all 30MP chillers to the multi-chiller controller panel from their desired location.
All field wiring should be connected to the terminal strip supplied in the 30MP multi-chiller controller accessory panel.
The TruVu controller board communicates to each legacy 30MP chiller via the UPC Open BACnet Communication Module. The TruVu controller communicates with the new 30MP chillers through a PIC6.1 controller which uses network points over an MS/TP network.
It is necessary to connect the 30MP multi-chiller controller accessory panel and each UPC Open module or PIC6.1 module on an MS/TP network segment. The PIC6.1 chiller can also communicate over IP with the TruVu controller. All wiring is field supplied.
For a description of LEDs, switches, jumpers, connection ports, and terminators on the UPC Open Interface, see Fig. 1.
For an example of how to wire the 30MP multi-chiller accessory panel (UPC Open module and PIC6.1 controller) to the BACnet Communication Module on each 30MP chiller, see Fig. 2 and 3.
If the TruVu controller is at either end of the network segment, set the End of Net to YES (which applies network termination and bias).
The UPC Open module is located behind the low voltage terminal block (LVT) in each 30MP chiller control panel. See Fig. 4. For PIC6.1 controller with the J10 connector see Fig. 5.

BT485 Terminator
MS/TP Communication Wiring

Tx1 LED Rx1 LED
Tx2 LED Rx2 LED
EIA-485 Jumpers

Power LED

45 45

BACnet

Baud Rate

6 789

Dip Switches

01 01

6 789

Address Rotary

Switches

23 23

Run LED Error LED

Fig. 1 — UPC Open Interface Details 2

Terminal Block, TB1 on 30MP Multi-Chiller Controller Accessory Panel BACnet Communication Modules Located In Each 30MP Chiller

Port S1 NET + 21 NET – 22 Shield 23
TB1
BT485 NET + NET Shield
BT485 NET + NET Shield
BT485 NET + NET Shield

Fig. 2 — MS/TP Network Daisy Chain Configuration (UPC)
Terminal Block, TB1 on 30MP Multi-Chiller Controller Accessory Panel BACnet Communication Modules Located In Each 30MP Chiller

Port S1 NET+ 21 NET- 22 Shield 23

TB1
J10 J10 J10

+ c –

NOTE: Ground (G) represents C.
Fig. 3 — MS/TP Network Daisy Chain Configuration (PIC6.1)

UPC Open Module
30MP Control Panel
Fig. 4 — Location of the UPC Open Module Within the 30MP Control Panel
J10 Connector
Fig. 5 — PIC6.1 Controller (J10 Connector) Within 30MP Control Panel 4

INSTALLATION
Prerequisites
Prior to installation ensure that:
· Each legacy 30MP chiller is equipped with a UPC Open module. Legacy chillers are unit sizes 016, 020, 030, 032, 040, 045, 050, 055, 060, 065, and 070.
· New 30MP chillers are equipped with a PIC6.1 controller. Unit sizes 017, 021, 031, 033, 041, 046, 051, 056, 066, and 080 use the PIC6.1 controller.
· All 30MP chiller units must be the same type (air-cooled or water-cooled). If one unit is air-cooled, all other units must be air-cooled and vice versa.
Step 1 — Inspect Shipment
Inspect the contents of the accessory package before installing. File a claim with the shipper if shipping damage is found or contact your Carrier representative if any parts are missing. See Table 1 for accessory kit package contents.

Table 1 — Package Contents

DESCRIPTION Control Box Assembly Thermistor Well

QUANTITY 1 1 1

PART NUMBER —
HH79NZ029 10HB50106802

Step 2 — Position and Mount the Panel
The 30MP multi-chiller controller accessory panel can be wall mounted using (4) 1/4 in. screws. Select the proper location for the 30MP multi-chiller controller accessory panel. Ensure the location provides access to the required power wiring, wiring to the common water manifold temperature thermistor, and is able to be wired to the MS/TP network in a daisy chain with the 30MP chillers. The panel requires 120 vac (100 va) single phase incoming power.
NOTE: The maximum terminal strip torque is 7.52 in-lb. The terminal strip accepts incoming wire size 12 to 22 AWG.
Step 3 — Make Electrical Connections
To wire for power:
1. Open fuse block (FB1) to remove power from the power supply.
2. Select the appropriate knockout for incoming power wiring, and connect line side power wiring to the L1 terminal on the fuse block (FB1) and the neutral terminal (NEU) on the terminal block (TB1). Connect the ground wire to the ground terminal (GND) on terminal block TB1. See 30MP multichiller controller wiring diagram provided inside the accessory panel.
3. Restore power to the power supply and verify that the Power LED is on (in the controller module). See Fig. 6 for Power LED location.
Step 4 — Address Controllers
For PIC6.1 controller and UPC Open module:
· Equal sized chillers: There are no special staging or addressing guidelines.
· Unequal sized chillers: Carefully implement the following staging and addressing instructions for optimal water temperature control and part-load efficiency. See Tables 2 and 3 for correct unit ordering.

Table 2 — Chiller Addressing

CHILLER ORDER
CH-1 CH-2 CH-3 CH-4 CH-5 CH-6 CH-7 CH-8

UPC OPEN ADDRESS
01 02 03 04 05 06 07 08

PIC6.1 ADDRESS
01 02 03 04 05 06 07 08

Table 3 — Chiller Size Ordering

CHILLER ORDER
First Chiller
Last Chiller

30MP MODEL SIZES
017 021 041 046 031 033 051 056 066 — 080

30MP LEGACY MODEL SIZES
016 020 030 032 040 045 050 055 060 065 070

Power

MUC Board
5

Fig. 6 — LED Locations

SETUP PIC6.1 CONTROLLERS
1. Login as Factory in order to see Configuration in the Main Menu. See Table 4 for factory configurations.
2. Press the home button to get back to the main screen. Login as Factory in the Main Menu. See Table 5 for PIC6.1 BACnet configuration.
3. Once all BACnet parameters are set press the Unit Start/Stop button, then select Network. When this is complete the
TruVu controller is ready to control the chillers. See Fig. 7.

Fig. 7 — Unit Start/Stop Screen

Table 4 — PIC6.1 Configuration — Factory Parameters

(Factory Main Menu Configuration Factory Parameters)

SCREEN 4

Enable Liquid Line Valve

[No]/Yes

Enable Head Press Act A

[No]/Yes

Enable Evap Isolator Rel

[No]/Yes

Leakage Charge Detection

[No]/Yes

Enable BACNet Option

No/[Yes]a

NOTE(S):
a. Item requires configuration.
ADDRESS THE UPC OPEN MODULES
Address and configure the chiller system before starting the multichiller controller, which supports a maximum of 8 chillers. These steps enable the controller to communicate with each individual chiller through their corresponding UPC Open module.
Once the system is powered and operating, the TruVu controller reads the type and size of each chiller and automatically configures any additional features (such as hot gas bypass) that could impact machine staging or sequencing.
Chillers should be addressed with MAC address 01 to 08. To address a UPC controller use the rotary switches (see Fig. 8):
Perform the following procedure to assign an address:
1. Set the Tens (10’s) switch to the tens digit of the address.
2. Set the Ones (1’s) switch to the ones digit.
For example, if the controller’s address is 25, point the arrow on the Tens (10’s) switch to 2 and the arrow on the Ones (1’s) switch to 5 as shown in Fig. 8.

Table 5 — PIC6.1 Configuration — BACnet Parametersa

(Factory Main Menu Configuration Network Menu BACnet Parameters)

Screen 1

BACnet Enable Option

0 — Disabled

1 — BACnet IP

2 — BACnet MSTP

Metric Units?

[No]/Yes

Screen 2

Network

16101b

UDP Port Numbers

47808

Device ID Manual

161010xb

Device ID Auto Option

[Disable]/ Enableb

Alarm Reporting

Disable/ [Enable]

Screen 3

BACnet Manage Occupancy

[No]/Yes

IP Port Interface Name

0=J5/J15

1=J16

BACnet MS/TP MAC Address

Screen 4

BACnet MS/TP Baud Rate

0=9600

1=19200

2=38400

3=57600

Screen 5

3=57600

4=76800

5=115200

BACnet MS/TP Max Master

127

MS/TP Max Info Frames

NOTE(S):
a. X represents chiller number. Example: Chiller1 x would be 1, Chiller2, x would be 2.
b. Item requires configuration.

BT485 TERMINATOR
BACNET CONNECTION (BAS PORT)
Tx1 LED Rx1 LED
Tx2 LED Rx2 LED
EIA-485 JUMPERS

POWER LED

OFF

6 5 4

3 2

6 789

BACNET BAUD RATE DIP SWITCHES

ON
8
7 6 5 4 3 2
1

OFF

Address Dip Switches

6 78 9 10’s

RUN LED ERROR LED

6 789

1’s

23
23
23 23

Address Rotary Switches

Fig. 8 — Setting the Address Rotary Switches on the UPC Open Module (Inside 30MP Chiller)

Step 5 — Wire the MS/TP Network
When wiring the MS/TP network follow the procedure below:
1. The TruVu controller communicates with each chiller using BACnet communication on an MS/TP network. The factory default setting for the controller, UPC Open module and, PIC6.1 controller are 76.8 kbps. It is recommended to use the default baud rate.
NOTE: The TruVu controller, UPC Open modules (located in each 30MP chiller), and PIC6.1 controllers must be set to the same baud rate. For BACnet baud rate dip switch locations refer to Fig. 8. Switches 1,2, and 4 must be set to the ON position. Switches 3,5,6,7, and 8 should be set to the OFF position. Refer to Table 5 for setting the baud rate of the PIC6.1 controllers. The TruVu controller will already be configured for 76.8 kbps.
NOTE: The CCN (Carrier Comfort Network®) baud rate on each 30MP chiller must also be set to the same baud rate as the TruVu controller and all UPC Open modules in each chiller or PIC6.1 controller.
2. Wire the multi-chiller controller accessory panel, with the UPC Open module or, PIC6.1 controller in each 30MP chiller on an MS/TP network segment in a daisy-chain configuration (refer to Fig. 2 and 3). A BT485 terminator in the UPC module is a signal biaser that adds bias and prevents signal distortions due to echoing.
3. In the multi-chiller controller panel, connect the MS/TP communication wires to terminals 21, 22, and 23 on the terminal block. See “Typical Wiring Schematic” on page 9.

Step 6 — Wire the TruVu Controller to the Network
To wire the TruVu controller to the network:
1. Open the fuse block (FB1) to remove power to the controller.
2. Check the communications wiring for shorts and grounds.
3. Connect the communications wiring to terminals 21, 22, and 23 on the terminal block (if not already done). See “Typical Wiring Schematic” on page 9.
4. Verify that the end of the Net switch is in the up position (YES) on the TruVu controller.
When installation is complete, restore power to the power supply, in the 30MP multi-chiller controller accessory panel.
Step 7 — Wire the Inputs and Outputs
The multi-chiller controller requires a 5k ohm common leaving water temperature thermistor. Included in the accessory package is the 5k ohm thermistor (P/N HH79NZ029) with a 4 in. immersion well (P/N 10HB50106802). See Fig. 9 for dimensions.

A B

0.505/0.495

0.61 DIA

1/4 N.P.T.
PART NUMBER 10HB50106802

6″ Minimum Clearance For
Thermistor Removal

DIMENSIONS — in. (mm)

4.10 (104.1)

1.28 (32.5)

Fig. 9 — Thermistor Well Dimensions

Install the thermistor well on the chilled and /or hot water supply, downstream of the last chiller as shown in Fig. 10. Water flows to the evaporator for cooling and to the condenser for heating.
Connect the thermistor leads to terminals 13 and 14 for chilled water on the terminal block (TB1) in the multi-chiller controller accessory panel.
Connect the thermistor leads to terminals 7 and 8 for hot water on the terminal block (TB1) in the multi-chiller controller accessory panel.
Tables 6 and 7 show each available output and input. All connections are made at the terminal block (TB1) in the 30MP multichiller controller accessory panel. See Fig. 11.
T
Common Leaving Water Temperature

30MP Multi-Unit Control Panel

30MP Chiller

STRAINER

Control Box

MS/TP Network Wiring

30MP Chiller

Control Box

30MP Chiller
Fig. 10 — Common Leaving Water Temp Sensor Location
To wire inputs and outputs, connect to the appropriate landings on the terminal block (TB1) in the 30MP multi-chiller controller accessory panel. See Fig. 11 for the typical wiring schematic and Table 8 for input wiring specifications. Each output is a dry contact rated at 1 A, 24-v maximum and is normally open. To size output wiring, consider the following: · Total loop distance from the power supply to the control-
ler, and then to the controlled device. NOTE: Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length. · Acceptable voltage drop in the wire from the controller to the controlled device. · Resistance (ohms) of the chosen wire gauge. · Maximum current (amps) the controlled device requires to operate.

Table 6 — Available Outputs

AVAILABLE OUTPUT
Tower Fan Speed
Alarm Lamp

OUTPUT TERMINAL
(TB1)
4
5

GND TERMINAL
(TB1)

HARDWARE / SIGNAL

0-10 vdc

Relay

NOTE
Optional Optional

Table 7 — Available Inputs

AVAILABLE INPUT
Relative Humidity Sensor
External Analog Setpoint
Outdoor Air Temperature Sensora
Leaving Chilled Water Header Temperature
Leaving Hot Water Header Temperature
External Demand Limit
Remote Occupancy Contact

INPUT TERMINAL
(TB1) 20 17 16
13
7
12 9

GND TERMINAL
(TB1) 19 18 15
14
8
11 10

HARDWARE SIGNAL 0-5 vdc 0-5 vdc 10k
Thermistor
5k Thermistor
5k Thermistor
Dry Contact Dry Contact

NOTE
Optional
Optional
Optional
Required (if making chilled water)
Required (if making hot
water)
Optional
Optional

NOTE(S):
a. Use this input to reset leaving chilled or hot water temperature based on outdoor air temperature.

Table 8 — Input Shielded Wiring Specifications

INPUT
0-5 vdc 0-10 vdc
Thermistor Dry Contact Pulse Counter (TLO)
TruVu ET Device

MAXIMUM LENGTH (ft) 1000
1000
500

MINIMUM GAUGE (AWG) 26
22
22

LEGEND
AWG — American Wire Gauge TLO — Timed Local Override

IMPORTANT: Connect the shield wire to the terminal with the ground wire. Do not connect the shield wire at the other end of cable as this will cause a ground loop error.

Fig. 11 — Typical Wiring Schematic

Step 8 — Wire Sensors to the 30MP Multi-Chiller Controller Accessory Panel
Connect the following sensors: · Leaving chilled water header temperature (required if
making chiller water) · Leaving hot water header temperature (required if making
hot water) · Outdoor air temperature (optional) · Relative humidity (optional) NOTE: This document gives instructions for wiring the sensors to the controller. Table 8 shows the type and gauge of wire to use when wiring sensors to the controller. For mounting and wiring the sensors, see the Carrier Sensors Installation Guide.
WARNING
Disconnect electrical power to the controller before wiring it. Failure to follow this warning could cause electrical shock, personal injury, or damage to the controller.
CAUTION
Do not run sensor or relay wires in the same conduit or raceway with Class 1 AC or DC service wiring. Do not abrade, cut, or nick the outer jacket of the cable. Do not pull or draw cable with a force that may harm the physical or electrical properties. Avoid splices in any control wiring. Failure to follow these cautions may result in damage to the controller.
WIRING THE LEAVING CHILLED WATER HEADER TEMPERATURE SENSOR TO THE CONTROLLER 1. Strip the outer jacket from the cable for at least 4 in.
(10.2 cm). Strip .25 in. (.6 cm) of insulation from each wire. 2. Wire the sensor to the 30MP multi-chiller controller acces-
sory panel. Refer to Fig. 11. Sensor must be terminated at Terminals 13 and 14 of TB1. 3. Apply power and verify sensor readings.
WIRING THE LEAVING HOT WATER HEADER TEMPERATURE SENSOR TO THE CONTROLLER 1. Strip the outer jacket from the cable for at least 4 in.
(10.2 cm). Strip .25 in. (.6 cm) of insulation from each wire. 2. Wire the sensor to the 30MP multi-chiller controller acces-
sory panel. Refer to Fig. 11. Sensor must be terminated at Terminals 7 and 8 of TB1. 3. Apply power and verify sensor readings.
WIRING AN OUTDOOR AIR TEMPERATURE SENSOR (PART NO. 33ZCSENOAT) An optional outdoor air temperature (OAT) sensor may be used to provide a reset of the chilled and/or hot water setpoint adjustment based on the OAT reset. To wire an outdoor air temperature sensor to the controller: 1. Strip the outer jacket from the cable for at least 4 in. Strip
.25 in. (.6 cm) of insulation from each wire. 2. Wire the sensor to the controller. Refer to Fig. 11. Sensor
must be terminated at terminals 15 and 16. 3. Apply power and verify sensor readings.

WIRING A RELATIVE HUMIDITY SENSOR — WALL AND DUCT SENSOR (PART NO. 33ZCSENSRH-02)
Use the optional relative humidity (RH) sensor to override the OAT reset in order to provide better humidity control.
NOTE: The RH override requires that the OAT sensor is installed and OAT reset function is enabled and active. Otherwise, there is only the RH sensor monitoring and alarming.
To wire the RH sensor to the controller:
1. Strip the outer jacket from the cable for at least 4 in. (10.2 cm). Strip .25 in. (.6 cm) of insulation from each wire.
2. Wire the sensor (P/N 33ZCSENSRH-02). Refer to Fig. 11. It must be terminated at terminals 19 and 20. Use terminal 2 on TB1 to connect the 24vdc+ to the sensor.
3. Apply power and verify sensor readings.
CONFIGURING THE CONTROLLER
Configuring Points and Properties
To start up the controller, it is necessary to configure certain points and properties. See Appendix C “30MP MULTI-CHILLER POINTS/PROPERTIES” on page 17 for a list of points and properties, with descriptions, defaults, and ranges. These properties affect the unit operation and/or control. Review and understand the meaning and purpose of each property before changing it. NOTE: The controller does not support metric units of measure.
To start up the controller, configure necessary points and properties in the following order:
1. Set the Unit Configuration.
2. Set the Chilled Water or Hot Water Setpoint.
3. Set the Control Point for entering or leaving water temperature.
4. Set the controller for all chillers (either UPC Open module or PIC6.1 controller).
5. To start the plant, set the Occupancy Status to Occupied.
SEQUENCE OF OPERATION
The multi-chiller controller sequences chillers in order to maintain the desired water temperature setpoint. The controller can be configured to maintain supply or return water temperature.
Whenever the controller is in an occupied mode, the water temperature sensor is compared to the desired setpoint. If the water temperature sensor value is above the setpoint (for chilled water), then a PID will calculate how much additional capacity is required. If the water temperature sensor value is below the setpoint (for hot water), then a PID will calculate how much additional capacity is required. The minimum amount of chillers is defined by the parameter Minimum Number of Chillers to Run. See Appendix C, Table F “Service Configuration” on page 22 for number of chillers required. If the current number of chillers is less than the minimum number, then the chillers are started every 30 seconds until the minimum number is reached. Thereafter, additional stages are added subject to the configured ACR Timer delay time.
As each chiller is started, it is limited to its first stage of capacity until all available chillers are operating. Once all machines are operating at minimum capacity, if additional capacity is required, any 3-stage machine is loaded to 2 stages next, until all 3-stage machines are loaded to that capacity. If that level is reached and still further capacity is needed, then all machines are sequentially loaded until every machine is operating at 100% capacity. This sequence provides the most efficient operation of multiple chillers.
As the load decreases and the required capacity is reduced, the reverse cycle occurs. All machines are reduced by one stage to either 50% or 67%, depending on the number of machine stages.

As a further capacity reduction is needed, the second stage of any 3-stage machine is dropped until only one stage is operating per machine. As further reduction is needed, the first stage is dropped on each machine in the opposite order of the chiller sequence. NOTE: Dropping any stage is subject to the RCR Timer delay time between stages.
Additionally, if only one stage is operating per machine and any machines are equipped with hot gas bypass, the hot gas is used to maintain the desired water temperature, while waiting for the RCR Timer delay to expire, in order to further reduce capacity. Hot gas bypass provides improved water temperature control under light load conditions and prevents excessive chiller start/stop cycles.
The controlling setpoint for chilled water is calculated based on the following settings:
1. Configure Chilled Water Setpoint for the desired water temperature.
2. Use Cooling Setpoint OAT Reset to increase the water temperature setpoint as a function of the outdoor air temperature. NOTE: An OAT sensor is required to use this feature.
3. Use RH Cooling Setpoint Reset to reduce any calculated OA reset if a high humidity condition occurs.This usually happens under light load at lower OAT. NOTE: An RH sensor is required to use this feature.
The controlling setpoint for hot water is calculated based on the following settings:
1. Configure Hot Water Setpoint for the desired water temperature.
2. Use Heating Setpoint OAT Reset to decrease the water temperature setpoint as a function of the outdoor air temperature. NOTE: An OAT sensor is required to use this feature.
Scheduling
To use an occupancy schedule, configure time periods to schedule the transitions from occupied to unoccupied operation. The controller maintains the desired water setpoint when occupied and disables the chiller when unoccupied. The controller defaults to using the BAS (Building Automation System) On/Off point, which is factory set to Inactive. The unit will stay unoccupied until a Time Schedule is configured or a third-party control system Enables/Disables the BAS On/Off point. Set the local time and date for these functions to operate properly.
It is possible to change the occupancy source to one of the following:
OCCUPANCY SCHEDULES
The controller is occupied 24/7 until the time schedule is configured using the TruVu ET Display, Field Assistant, the i-Vu® application, or until a third-party control system Enables/Disables the BAS On/Off point. Disable this by going to (Configuration Unit Configuration Occupancy Schedules) and changing the point from Enable to Disable and clicking OK.
NOTE: Enable this point in order for the TruVu ET Display, Field Assistant, or the i-Vu® application to assign a time schedule to the controller.
SCHEDULE
The unit operates according to the schedule configured and stored in the unit. The schedule is accessible in the TruVu ET Display, Field Assistant, or the i-Vu application. The daily schedule consists of a start and stop time (standard or 24 hour mode) and seven days of the week, starting with Monday and ending on Sunday.

OCCUPANCY INPUT CONTACT (OPTIONAL)
If configured for remote occupancy control (default), the controller can use an external dry contact closure connected to terminals 9 and 10 on TB1, to determine the occupancy status of the unit. Disable the Occupancy Schedules to use the occupancy contact input.
NOTE: Scheduling can only be controlled from one source.
BAS (BUILDING AUTOMATION SYSTEM) ON/OFF
For use with a Building Automation System that supports network scheduling, disable the Occupancy Schedules so the BAS can control the unit through a network communication and the BAS scheduling function.
NOTE: Scheduling can either be controlled from the unit or the BAS, but not both.
SYSTEM OCCUPANCY
Uses the network to obtain an occupancy status value from another controller, which is read over the network and used by this controller. Occupancy Schedules MUST be set to Disable to use this function.
NOTE: Scheduling can only be controlled from one source.
Demand Limiting
The multi-chiller controller can provide up to 3 stages of demand limiting, if connected to an electric metering program indicating that demand limiting is required.
Demand limiting works using 2 different methods. The first connects the BACnet network input point System Cool/Heat Demand Level to the electric metering program, to send a value for the demand level. The second method is a binary input point IN-5 Extended Demand Limit that sets the demand level to 2 when the input is active.
CHILLED WATER
Demand Level 1, called the red line limit, sets the maximum chiller capacity to the current operating capacity, so that no additional capacity can be added. This prevents further increase in demand, although it will not prevent any necessary capacity reduction.
Demand levels 2 and 3 provide an adjustment to the operating setpoint. Demand level 2 occurs when System Cool Demand Level is set to 2 or the Extended Demand Limit input is active. This increases the chilled water setpoint by the configured Demand Level 2 Cool Adjustment amount. Demand Level 3 occurs when System Cool Demand Level is set to 3. This increases the chilled water setpoint by the configured Demand Level 3 Cool Adjustment amount. If the System Cool Demand Level is set to 0 and the IN-5 Extended Demand Limit is inactive, then there is no demand limiting.
HOT WATER
Demand Level 1, called the red line limit, sets the maximum chiller capacity to the current operating capacity, so that no additional capacity can be added. This prevents further increase in demand, although it will not prevent any necessary capacity reduction.
Demand levels 2 and 3 provide an adjustment to the operating setpoint. Demand level 2 occurs when System Heat Demand Level is set to 2 or the Extended Demand Limit input is active. This decreases the hot water setpoint by the configured Demand Level 2 Heat Adjustment amount. Demand Level 3 occurs when System Heat Demand Level is set to 3. This decreases the hot water setpoint by the configured Demand Level 3 Heat Adjustment amount. If the System Heat Demand Level is set to 0 and the IN-5 Extended Demand Limit is inactive, then there is no demand limiting.

OA (Outdoor Air) Reset
CHILLED WATER
It is possible to raise the water temperature setpoint as a function of the outdoor air temperature. Set the Cooling Setpoint OA Reset to Enable, then as the OA temperature drops below the OAT CHW Supply Reset High Limit, the water temperature setpoint increases proportionally between OAT CHW Supply Reset High Limit and OAT CHW Supply Reset Low Limit. At OAT CHW Supply Reset Low Limit, the maximum reset amount and maximum OA CHW Reset, is added to the configured water temperature setpoint.
If Cooling Setpoint OA Reset is set to Disable, then the configured water temperature setpoint is used.
HOT WATER
It is possible to lower the water temperature setpoint as a function of the outdoor air temperature. Set the Heating Setpoint OA Reset to Enable, then as the OA temperature rises above the OAT HW Supply Reset Low Limit, the water temperature setpoint decreases proportionally between OAT HW Supply Reset Low Limit and OAT HW Supply Reset High Limit. At OAT HW Supply Reset Low Limit, the maximum reset amount and maximum OA HW Reset, is added to the configured water temperature setpoint.
If Heating Setpoint OA Reset is set to Disable, then the configured water temperature setpoint is used.
RH (Relative Humidity) Cooling Reset
The multi-chiller controller can reduce any calculated OA reset, if the sensed relative humidity is above the control setpoint. Set the RH Cooling Setpoint Reset to Enable, as the RH increases above the Occupied Relative Humidity Setpoint, a PID (Proportional Integral Derivative Loop) calculates the amount of reduction in the OA reset value. RH Cooling Setpoint Reset is only applicable if the OA reset is active, since it can only reduce what is calculated by that algorithm. RH Cooling Setpoint Reset will NOT lower the water temperature setpoint below the user-defined Chilled Water Setpoint value.
If the RH Cooling Setpoint Reset is set to Disable, then the configured Chilled Water Setpoint, plus any calculated OA reset, is the controlling setpoint.
Power Failure Recovery
The controller has a Power Fail Restart Delay for after a power loss. The amount of time can be configured in seconds, up to 600. When the power returns, the controller prevents operating and starting any chillers for that amount of time.
The controller can also immediately restart the prior number of operating chillers in their previous capacity, if the duration of a power outage was less than the configured Immediate Restart Time in minutes. The plant returns to capacity quickly if there is a short outage and prevents waiting to load the plant at the ACR (Additional Capacity Required) rate. This feature adds stages every 30 seconds until the previously operating plant capacity is reached.
Cool Enable
The controller can prevent chiller operation if the OAT is below an adjustable OA temperature. If Cool Enable is set to Enable and there is a valid OA temperature and if the OA temperature is greater than the Cooling Lockout Temperature, the controller actively controls the chillers as required. If the OA temperature falls below the configured lockout value of 45°F, then all chillers are disabled.

Heat Enable
The controller can prevent chiller operation if the OAT is above an adjustable OA temperature. If Heat Enable is set to Enable and there is a valid OA temperature and if the OA temperature is less than the Heating Lockout Temperature, the controller actively controls the chillers as required. If the OA temperature rises above the configured lockout value of 65°F, then all chillers are disabled.
Rotation Method
The multi-chiller controller can rotate chillers based on several different methods. Rotation is only available with equal sized units. Set the rotation method using Rotation Method Sequence, and selecting Never, Daily, Weekly, Monthly, Manual, Runtime, or Runtime Equalization. The default and preferred method is Runtime Equalization, as it rotates the least-used machine to the lead position, but only when machines are started, so that no additional start/stop cycles are incurred.
For unequal-sized chillers, the staging sequence is dependent on the actual machine size and should not be altered, in order to provide the best water temperature control. For unequal-sized machines no rotation method is available, see Appendix C, Table C on page 19.
Analog Setpoint Input
The controller has an analog input channel used for an external setpoint input. The external setpoint input range depends on whether the connected chillers are brine or water. Channel IN-2 is used for external setpoint input and the range is 1 to 5 vdc.
· For water chillers, the range is proportional from 1 to 5 volts where 1 volt = 40°F and 5 volts = 65°F.
· For brine chillers, the range is proportional from 1 to 5 volts where 1 volt = 20°F and 5 volts = 45°F.
· For hot water chillers, the range is proportional from 1 to 5 volts where 1 volt=80°F and 5 volts=140°F.
NOTE: The lowest allowable setpoint is determined by the highest freeze setpoint of any machine connected to the controller.
Condenser Water Temperature Control (Tower Fan)
The controller has an analog output channel used to operate a cooling tower fan. The control reads the condenser water temperature from the 30MP chiller UPC Open or PIC6.1 controller. To accomplish this, the first chiller (CH1) must have the condenser water temperature sensor option and must have a valid status (Off and Available or CCN Mode and Running). If that chiller status is invalid, the control will check sequentially for the next available chiller (CH2-CH8). Installing the CWT option on at least the first two chillers is strongly recommended. It is possible to configure channel AO-2 to provide a 2 to 10 vdc or 0 to 10 vdc signal to control a tower fan VFD (variable frequency drive).
If an external control system is available, it can be used with the multi-chiller controller to provide the optimum tower setpoint value to the external control. A network-accessible analog value point or condenser water setpoint, can provide the desired condenser water temperature setpoint in degrees Fahrenheit.

30MP UPC Open Chiller Linkage
The multi-chiller controller receives and sends information to UPC through 30MP chiller linkage. It reads the following from each machine, as applicable:
· Alarm state
· Compressor relay state
· Compressor sizes
· Evaporator entering water temperature
· Evaporator leaving water temperature
· Machine runtime
· Mode
· Freeze setpoint
· Hot gas bypass
· Type of chiller (air-cooled or water-cooled, brine or water)
The display is automatically updated to reflect the actual machine type and the proper setpoint range, if the external analog input is used.
The chiller linkage sends each chiller a control setpoint, enable command, and demand limit value. By transferring data between the multi-chiller controller and each chiller, the controller automatically configures each machine and then sends and receives data. This operates the system properly and meets the desired chilled water setpoint by commanding each individual 30MP chiller to run as necessary. The operating mode, hot gas valve status, and entering and leaving water temperatures are displayed on the graphic, along with other information.
30MP PIC6.1 System Points
The multi-chiller controller receives and sends information to the PIC6.1 controller through System Points. It reads the following from each machine, as applicable:
· Alarm state
· Compressor relay state
· Compressor sizes
· Condenser entering water temperature
· Condenser leaving water temperature
· Condenser water temperature
· Entering water temperature
· Freeze setpoint
· Hot gas bypass
· Heat/Cool status
· Leaving water temperature
· Machine runtime
· Mode
· Type of chiller (air-cooled or water-cooled, brine or water)
The display is automatically updated to reflect the actual machine type and the proper setpoint range, if the external analog input is used.

The System Points send each chiller a heat/cool mode, control setpoint, enable command, and demand limit values. By transferring data between the multi-chiller controller and each chiller, the controller automatically configures each machine and then sends and receives data. This operates the system properly and meets the desired chilled water setpoint by commanding each individual 30MP chiller to run as necessary. The operating mode, hot gas valve status, and entering and leaving water temperatures are displayed on the graphic, along with other information.
TROUBLESHOOTING
LEDs
The LEDs indicate if the controller is speaking to the devices on the network. The LEDs should reflect communication traffic based on the baud rate set. The higher the baud rate the more solid the LEDs become.
Verify the LED patterns by cycling power to the controller and noting the lights and flashes. Tables 9 and 10 show the LED description and the error status. See Fig. 12 for indicator status.

See Tables 9 and 10

Fig. 12 — LED Indicator

Table 9 — LED Description

LEDs

STATUS

Lights when power is being supplied to the controller.

NOTE: The controller is protected by internal solid-state

Power

Polyswitches on the incoming power and network connections. These Polyswitches are not replaceable, but they will reset

themselves if the condition that caused the fault returns to

normal.

Lights when the controller receives data from the network segment; there is an Rx LED for Ports S1, ETH0, and ETH1.

Lights when the controller transmits data to the network

segment; there is an Rx LED for Ports S1 and 2, ETH0, and

ETH1.

Net LED to show Network status.

Sys LED to show Controller status.

Output Indicates status of each output.

Prog LED is customizable.

LEGEND

Prog — Rx — Sys — Tx —

Programmable Indicator Receiving Data System Status Transmitting

How to Obtain Serial Number (TV-UC683T)
The controller’s serial number is on a sticker on the back of the main controller board. If you need the controller’s serial number when troubleshooting, the number is on:
· A Module Status report (Modstat) under Core or Main board Hardware. See Fig. 13.
· A QR code, serial number, and MAC address printed on a sticker on the cover.

· A laser-etched number and QR code on the inside circuit board.
Fig. 13 — Serial Number Sticker

Table 10 — LED Error Status Troubleshooting

COLOR
RED
RED
BLUE
BLUE BLUE BLUE
BLUE GREEN MAGENTA
WHITE
RED RED RED GREEN GREEN GREEN GREEN BLUE BLUE BLUE
MAGENTA
WHITE

PATTERN
On
1 blink
On
1 blink 2 blink 3 blink
4 blink On
1 blink every second for 15 s
2 blink 4 blink Fast blink 1 blink 2 blink 3 blink Fast blink
On Slow blink Fast blink
1 blink every second for 15 s

CONDITION

MESSAGE IN MODULE STATUS

POSSIBLE SOLUTIONS

NET (Network Status) Tricolor LED

Ethernet connection problem.

No Ethernet Link.

Connect Ethernet Cable. Check other network components.

One of the following BACnet/IP (Ethernet) DLL reporting issue: Unable to create tasks. Unable to open socket for BACnet port.

BACnet/IP error.

Cycle power.

One of the following issues: Port communication firmware did not load properly. Port communication firmware is not running. Invalid protocol selected.

MSTP firmware error.

Change protocol using USB Service Port. Cycle power.

Invalid address selected for protocol.

Invalid address selection for MS/TP.

Change MAC address to unique address using USB Service Port.

Controller has same MAC address as another connected device.

Duplicate address on MS/TP.

Change MAC address to a unique value using USB Service Port to valid address.

Controller is the only device on the network.

No other devices detected on MS/TP.

Check that network cable is connected properly. Check that baud rate is correct.

Check that network cable is connected Excessive errors detected over 3 second period. Excessive communication errors on MS/TP. properly.
Check that baud rate is correct.

All enabled networks are functioning properly. No errors.

No action required.

Operating system changes are downloading.

WARNING: This process could take several minutes. Do NOT power off the controller during

N/A

the download.

No action required.

The Blink button on the controller setup Local Network tab has been pressed.

N/A

No action required.

SYS (System Status) LED

Restarting after an abnormal exit.

Auto restart delay due to system error on After 5 minute delay has expired, if

startup.

condition occurs again then cycle power.

Firmware image is corrupt.

Firmware error.

Download driver again.

Firmware error has caused the firmware to exit and restart.

Fatal error detected.

No action required.

No errors.

Operational.

No action required.

Download of driver is in progress.

Download in progress.

No action required.

BACnet Device ID is not set.

Download required.

Download the controller.

Installation of recently downloaded driver is occurring.

N/A

No action required.

Controller is starting up.

N/A

No action required.

Linux (operating system) is starting up.

N/A

No action required.

Linux is running but it could not start the firmware application.

N/A

Download driver.

Operating system changes are downloading.

WARNING: This process could take several minutes. Do NOT power off the controller during

N/A

the download.

No action required.

The Blink button on the controller setup Local Network tab has been pressed.

N/A

No action required.

APPENDIX A — MULTI-CHILLER WIRE LIST

Project Name: Location:
Point/ Cable Inputs (+)
IN-1

Terminal (TB1)
20

IN-2

IN-3

IN-4

IN-5

IN-6

IN-7

IN-8 Point/ Cable Outputs (+)
UO-1

Terminal (TB1)

AO-2

AO-3

BO-2

BO-3

BO-4

BO-5

BO-6

LEGEND
AO — Analog Output BO — Binary Output UO — Universal Output

SYSTEM NETWORK – 30MP MULTI-CHILLER

Controller: Network Number: MAC Address:

(G)

Terminal (TB1)

Input Type Sensor Code Equipment Name

Gnd

0-5 vdc

RH Sensor

Point Name

Gnd Gnd Gnd Gnd Gnd Gnd Gnd COM Gnd

0-5 vdc

AI Setpoint

10K OHM Therm.

5K OHM Therm.

OAT Sensor
Leaving Chilled Water Header Temperature

Dry Contact

Ext. Demand Limit

Dry Contact

5K OHM Therm.

Remote Occupancy Contact
Leaving Hot Water Header Temperature

Unused

Terminal (TB1)

Output Type

Sensor Code

Equipment Name

Point Name

Unused

Gnd

0-10 vdc

Tower Fan Speed

Gnd

Unused

Bus

24 vac

Alarm Lamp

Bus

Unused

Bus

Unused

Bus

Unused

Bus

Unused

APPENDIX B — DEVICE ADDRESS BINDING

Device Address Binding (DAB) allows the controller to receive data from other Open controllers when they are connected by a network. The controller receives data from other Open or BACnet controllers when they are installed as part of an i-Vu® control system. The data transfer takes the form of DAB, which must be configured.
Currently, the controller implements DAB for the following variables:
· System Outdoor Air Temperature
· System Occupancy

· System Leaving Load Water Temperature
· System Leaving Condenser Water Temperature
· System Control Setpoint · System Cool Demand Level
· System Heat Demand Level
· System Space RH (Relative Humidity) DAB can be implemented on network points with an undefined BACnet address, displayed in Field Assistant and the i-Vu® interface in Properties Network Points. See Fig. A.

Fig. A — DAB (Device Address Binding) Using Field Assistant and i-Vu® Interface

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES

Tables A-K describe all of the possible settings for the controller on the i-Vu® or Field Assistant Properties tab.
NOTE: Some of the properties are available only when other settings have been enabled. See Appendix D on page 30 for the points and properties available on the touchscreen interface.

NOTE: Engineering units shown in this document in the defaults and ranges are strictly for reference. Only integers may be used.
NOTE: Point Names are in the order which coincides with the Properties Page Menu.

Table A — Status

Navigation: i-Vu® / Field Assistant: Properties Control Program Status

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

Plant Run Status

The plant run status value states:

· Stop: The plant is commanded to stop.

· Delay: The plant is in a start-up delay.

R: Stop

· Ready: The plant is commanded to run, and no compressors are

Delay

required. The lead chiller is enabled to open isolation valves and

Ready

start pumps.

Run

· Run: The plant is commanded to run, and compressors are staged Shutdown

to satisfy the control setpoint.

· Shutdown: The plant shutdown is active.

Plant Run Command

The plant’s current run command.

R: Stop/Run

Plant Status

The plant’s current run status.

R: Off/Running

Equipment Alarm

Indicates the controller has an active alarm. See Service Configuration for causes.

R: Normal/Alarm

Chiller Plant MBH

Displays the current MBtu/hr of heating from the plant.

R: __Mbtu/hr

Chiller Plant Tons

Displays the current tons of cooling from the chiller plant.

R: __ tons

Chiller Plant Capacity

Displays the current percent loaded capacity of the chiller plant.

R: 0 to 100%

Chiller Control Temp

Displays the water temperature used to control the chiller plant.

R: __ °F

Chiller Control Setpoint

Displays the current setpoint used to control the chiller plant.

R: __ °F

Tower Fan Output

Displays the tower fan’s speed.

R: 0 to 100%

Tower Fan Control Temp

Displays the condenser water temperature used to control the cooling tower fan.

R: __ °F

Tower Fan Control Setpoint

Displays the current setpoint used to control the cooling tower fan. R: __ °F

Outdoor Air Temperature

The outdoor air temperature used for control.

R: 56° to 245°F

Space Relative Humidity

Displays the current value of relative humidity sensor, if present. Applicable if Relative Humidity Source is not set to N/A.

R: 0 to 100%

Shutdown

When Active, provides a means to stop the chiller plant in an orderly manner. All alarms are reset and only currently active alarms are displayed.

D: Inactive R: Inactive/Active

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table B — Chiller Status

Navigation: i-Vu® / Field Assistant: Properties Control Program StatusChiller Status

POINT NAME

DESCRIPTION

CHILLER #1

Chiller #1 Size

Chiller #1’s capacity model.

Chiller #1 Stages

Chiller #1’s available number of stages.

Chiller #1 Enable

Chiller #1’s start/stop command.

Chiller #1 Demand

The percentage of demand of Chiller #1.

Chiller #1 EWT

Chiller #1’s entering water temperature.

Chiller #1 LWT

Chiller #1’s leaving water temperature.

Chiller #1 ECWT

Chiller #1’s entering condenser water temperature.

Chiller #1 Status

Chiller #1’s status read from UPC controller.

Chiller #1 Linkage Status Chiller #1 LCWT
Chiller #1 Heat/Cool Status

Chiller #1’s linkage connection status. Chiller #1’s leaving condenser water temperature.
Chiller #1’s heat/cool mode status.

Chiller #1 Status

Chiller #1’s status read from PIC6.1 controller.

Chiller #1 Network Status Chiller #2 to 8

Chiller #1’s System Point binding status. Same information is available for CH-2 to CH-8.

RANGE (R)
R: __
R: 1 to 3
R: Stop/Start
R: 0 to 100%
R: __ °F
R: __ °F
R: __ °F
R: Linkage Not Available Off and Available CCN Mode and Running Low Load Recycle Local Mode or Wait Power Fail Restart Fault Shutdown Communication Failure
R: Not Active/Active
R: __ °F
R: No Comm Cool Heat Auto
R: Comm Not Available Off Running Stopping Delay Tripout Ready Override Defrost Run Test Test Local Network Remote Free Cool Comm Failure
R: Not Active/Active

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table C — Unit Configuration

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Unit Configuration

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

Heat Enable

Enables or disables heating operation.

D: Enable R: Disable/Enable

Heating Lockout Temperature

Heating is inhibited above this outdoor air temperature.

D: 65°F R: 30° to 120°F

Heating Setpoint OA Reset

Enables OA reset of the heating water supply temperature’s setpoint.

D: Disable R: Disable/Enable

OAT HW Supply Reset Low Limit

The lowest outdoor air temperature which resets the heating water D: 30°F

supply temperature.

R: __°F

OAT HW Supply Limit High Limit

The highest outdoor air temperature which resets the heating water supply temp. Must be set above the configured OAT HW Supply Reset Low Limit.

D: 60°F R: __°F

Maximum OA HW Reset

The highest heating water supply temp setpoint reset allowed by the D: 20°F

OAT.

R: 0° to 40°F

Cool Enable

Enables or disables cooling operation.

D: Enable R: Disable/Enable

Cooling Lockout Temperature

Cooling is inhibited below this outdoor air temperature.

D: 45°F R: 65° to 80°F

Cooling Setpoint OA Reset

Enables OA reset of the cooling water supply temp’s setpoint.

D: Disable R: Disable/Enable

OAT CHW Supply Reset Low Limit

The lowest outdoor air temperature which resets the cooling water D: 70°F

supply temp.

R: __°F

OAT CHW Supply Reset High Limit

The highest outdoor air temperature which resets the cooling water supply temp. Must be set above the configured OAT CHW Supply Reset Low Limit.

D: 90°F R: __°F

Maximum OA CHW Reset

The highest cooling water supply temp. setpoint reset allowed by the D: 10°F

OAT.

R: 0° to 25°F

RH Cooling Setpoint Reset

Enables or disables reset of the cooling water supply temp. setpoint, D: Disable

based on relative humidity.

R: Disable/Enable

Occupancy Schedules

Enables or disables the occupancy schedule function.

D: Disable R: Disable/Enable

Alarm Lamp for Chiller Alerts

Enable to use the Alarm Lamp relay for alarms AND chiller alerts.

D: Disable R: Disable/Enable

POWER FAILURE RECOVERY

Power Fail Restart Delay

On initial power up or after recovery from a power failure, the controller delays starting any equipment for the configured value of this delay in seconds. Max delay time is 600 sec.

D: 120 seconds R: 0 to 600 seconds

Immediate Restart Time

For a power failure less than this value (in minutes), the control restarts all previous running chiller stages at 30 second intervals. Maximum restart delay time is 720 min.

D: 20 minutes R: 0 to 720 minutes

SENSOR CALIBRATION

Leaving Cond. Water Temperature The current leaving condenser water temperature.

R: __°F

Leaving Cond. Water Temperature Sensor Calibration

A calibration offset value that allows adjusting of the local leaving condenser water temperature sensor to match a calibrated standard that is measuring the temperature in the same location.

D: 0°F R: 9.9° to 10°F

Leaving Load Water Temperature

The current leaving load water temperature.

R: __ °F

Leaving Load Water Temp Sensor Calibration

A calibration offset value that allows adjusting of the local leaving load water temperature sensor to match a calibrated standard that is measuring the temperature in the same location.

D: 0°F R: 9.9° to 10°F

Outdoor Air Temperature

The current outdoor air temperature.

R: __ °F

A calibration offset value that can be adjusted so the outdoor air Outdoor Air Temp Sensor Calibration temperature sensor matches a calibrated standard that measures
the temperature in the same location.

D: 0°F R: 9.9° to 10°F

Space Relative Humidity

Displays the current value of relative humidity sensor, if present. Applicable if Relative Humidity Source is not set to N/A.

R: __%rh

Space RH Sensor Calibration

A calibration offset value that allows adjusting of the space relative humidity sensor to match a calibrated standard that is measuring the humidity in the same location.

D: 0%rh R: 15 to 15%rh

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table C — Unit Configuration (cont)

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Unit Configuration

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

CHILLER ROTATION

Rotation Method Selector — Equal Size

Daily: Rotates the lead chiller daily at a specified time period.

Weekly: Rotates the lead chiller weekly on a specified day and time

period.

D: Runtime Equalization

Monthly: Rotates the lead chiller monthly on a specified day and time R: Daily

period.

Weekly

Manual Rotation: Manually rotates the lead chiller when the operator Monthly

commands it.

Manual Rotation

Runtime: Rotates the lead chiller after it reaches a specified number Runtime

of runtime hours.

Runtime Equalization

Runtime Equalization: Rotates the lead chiller when all chillers are on

and lead chiller runtime > lag chiller runtime.

SPECIFY DETAILS OF THE SELECTED ROTATION METHOD

Method

Enter…

Daily

Time of day to rotate the lead chiller NOTE: Enter the time of day below in “Defined Time for Rotation”.

Weekly

Day of the week to rotate the lead chiller.

D: Wednesday R: Monday to Sunday

Monthly

Day of the month to rotate the lead chiller monthly.

D: 1 R: 1 to 31

Manual Rotation

Manually rotates the lead chiller.

D: Do not rotate R: Rotate

Runtime

Number of runtime hours before rotating the lead chiller.

D: 360 hrs R: 200 to 9999 hrs

Runtime Equalization

Rotates the lead chiller when all chillers are on and lead chiller runtime > lag chiller runtime.

Defined Time for Rotation

Specify the time of day (24 hour format) for automatic rotation based on the method and schedule selected. (Not applicable to Runtime Equalization).

D: 8:00 R: 1:00 to 24:00

Runtime Since Last Rotation

Chiller CH-1 CH-2

Runtime 0.0 hr 0.0 hr

R: __ hrs

Chiller Order

Chiller CH-1 CH-2

Position 1 0

R: 1 to 8 0 = Not Available

Table D — Setpoints

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Setpoints

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

Hot Water Setpoint

The hot water temperature setpoint maintained by the chiller plant. D: 120°F

The setpoint is internally clamped so it will not exceed 140°F.

R: 80°F to 140°F

Chilled Water Setpoint

The chilled water temperature setpoint maintained by the chiller plant. The setpoint is internally clamped so it will not exceed the highest freeze point configured in any chiller.

D: 44°F R: 40 to 65°F for water
20 to 45°F for brine

CONDENSER WATER TEMPERATURE

CW Min Load Setpoint

The condenser water temperature setpoint at minimum load for tower fan control.

D: 65°F R: 50° to 85°F

CW Part-Load Setpoint

The condenser water temperature setpoint at partial load for tower D: 70°F

fan control.

R: 50° to 85°F

CW Full-Load Setpoint

The condenser water temperature setpoint at full load for tower fan D: 76°F

control.

R: 50 to 85°F

RELATIVE HUMIDITY

Occ Relative Humidity Setpoint

The control setpoint used during occupied periods.

D: 60%rh R: 0 to 100%rh

HEATING DEMAND LIMIT

Demand Level 1 Heat

Enables Demand Level 1 to limit the maximum stage capacity to the D: Disable

current operating capacity.

R: Disable/Enable

Demand Level 2 Heat Adj.

The hot water setpoint is decreased by this number of degrees when D: 3°F

receiving a Demand Level 2 signal.

R: 0 to 10°F

Demand Level 3 Heat Adj.

The hot water setpoint is decreased by this number of degrees when D: 5°F

receiving a Demand Level 3 signal.

R: 0 to 10°F

COOLING DEMAND LIMIT

Demand Level 1 Cool

Enables Demand Level 1 to limit the maximum stage capacity to the D: Disable

current operating capacity.

R: Disable/Enable

Demand Level 2 Cool Adj.

The chilled water setpoint is increased by this number of degrees D: 2°F

when receiving a Demand Level 2 signal.

R: 0°F to 10°F

Demand Level 3 Cool Adj.

The chilled water setpoint is further increased by this number of degrees when receiving a Demand Level 3 signal.

D: 3°F R: 0 to 10°F

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table E — Alarm Configuration

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Alarm Configuration

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

LEAVING CONDENSER WATER TEMPERATURE ALARM

Low Leaving Cond. Water Temp. Alarm Limit

The Leaving Condenser Water Temp. must drop below this value to

generate a Leaving Condenser Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal. NOTE: This value should be set to at least 10°F below the

D: 100°F R: 80 to 200°F

configured heating setpoint.

High Leaving Cond. Water Temp. Alarm Limit

The Leaving Condenser Water Temp. must exceed this value to

generate a Leaving Condenser Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal. NOTE: This value should be set to at least 4°F above the configured

D: 200°F R: 90 to 200°F

heating setpoint.

ENTERING CONDENSER WATER TEMPERATURE ALARM

Low Entering Cond. Water Temp. Alarm Limit

The Entering Condenser Water Temp. must drop below this value to generate an Entering Condenser Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal.

D: 100°F R: 80 to 200°F

High Entering Cond. Water Temp Alarm Limit

The Entering Condenser Water Temp. must exceed this value to generate an Entering Condenser Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal.

D: 200°F R: 80 to 200°F

LEAVING LOAD WATER TEMPERATURE ALARM

Low Leaving Load Water Temp. Alarm Limit

The Leaving Load Water Temp. must drop below this value to

generate a Leaving Load Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal. NOTE: This value should be set to at least 4°F below the configured

D: 42°F R: 45 to 45°F

cooling setpoint.

High Leaving Load Water Temp. Alarm Limit

The Leaving Load Water Temp. must exceed this value to generate a Leaving Load Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal. NOTE: This value should be set to at least 10°F above the configured cooling setpoint.

D:125°F R: 20 to 150°F

ENTERING LOAD WATER TEMPERATURE ALARM

Low Entering Load Water Temp. Alarm Limit

The Entering Load Water Temp. must drop below this value to generate an Entering Load Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal.

D: 42°F R: 45 to 45°F

High Entering Load Water Temp. Alarm Limit

The Entering Load Water Temp. must exceed this value to generate an Entering Load Water Temperature Alarm. There is a fixed hysteresis of 2°F for return to normal.

D: 125°F R: 90 to 150°F

OUTDOOR AIR TEMPERATURE ALARM

Low OAT Alarm Limit

The Outdoor Air Temperature must drop below this value to generate an Outdoor Air Temp Alarm. There is a fixed hysteresis of 1°F for return to normal.

D: 65°F R: 65 to 40°F

High OAT Alarm Limit

The Outdoor Air Temperature must exceed this value to generate an Outdoor Air Temp. Alarm. There is a fixed hysteresis of 1°F for return to normal.

D: 245°F R: 100 to 245°F

SPACE HUMIDITY ALARM

Occupied High RH Alarm Limit

The relative humidity sensor must exceed this value to generate a Space Relative Humidity alarm in the occupied mode if RH Cooling D: 100%rh Setpoint Reset (Unit Configuration) is set to Enable. There is a fixed R; 45 to 100%rh hysteresis of 5%rh for return to normal.

Alarm Delay (min./%RH)

Determines the amount of delay before an occupied RH alarm is generated when the controller transitions to the occupied mode. The D: 5 minutes delay time equals this value multiplied by the difference between the R: 0 to 30 minutes sensor RH value and the occupied RH setpoint plus 15 minutes.

Unoccupied High RH Alarm Limit

The value that the relative humidity sensor must exceed to generate a Space Humidity Alarm in the unoccupied mode if RH Control is set to Enable. There is a fixed hysteresis of 5%rh for return to normal.

D: 100%rh R: 45 to 100%rh

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table F — Service Configuration

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Service Configuration

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

Control Mode Selection

Defines whether to control this equipment to make hot water or chilled water.

D: Cool Mode R: Heat Mode
Cool Mode

Control Point

Defines whether the control monitors and uses Leaving Water Temp. or Entering Water Temp. to control this equipment.

D: Leaving Water Temp R: Leaving Water Temp
Entering Water Temp

Minimum No. of Chillers to Run

The least number of chillers that can run at the same time.

D: 0 R: 0 to 8

ACR Timer

ACR (Additional Capacity Required) Determines the time delay before an D: 5:00 minutes

additional compressor stage can be added.

R: 2:00 to 20:00 minutes

RCR Timer

RCR (Reduced Capacity Required) Determines the time delay before an D: 3:00 minutes

additional compressor stage can be removed.

R: 1:00 to 5:00 minutes

This BACnet Object calculates the amount of capacity required to satisfy the Hot Water Setpoint and allows access to the control loop’s tuning parameters. NOTE: The following default values should be changed only by a technician trained in PID Loop algorithms.

Heat PID
Heat PID Output Hot Water Control Offset

ACTION Update Interval Proportional Integral Derivative Deadband Bias

REVERSE 00:30 (mm:ss)
100 0 0 0 0

The Heat PID output that is used for staging the compressors. A positive value increases capacity; a negative value decreases capacity.

R: 100 to 100%

An offset value that is added to the effective Hot Water Setpoint. The

resulting value is the control point that is used by each chiller. This causes D: 2°F

each chiller to operate at a higher setpoint to achieve the desired hot

R: 0 to 10°F

water header temperature.

This BACnet Object calculates the amount of capacity required to satisfy the Chilled Water Setpoint and allows access to the control loop’s tuning parameters. NOTE: The following default values should be changed only by a technician trained in PID Loop algorithms:

Cool PID
Cool PID Output Chilled Water Control Offset Tower Fan Output Type

ACTION Update Interval

DIRECT 00:30 (mm:ss)

Proportional

100

Integral

Derivative

Deadband

Bias

The Cool PID output that is used for staging the compressors. A positive value increases capacity; a negative value decreases capacity.
An offset value that is subtracted from the effective Chilled Water Setpoint. The resulting value is the control point that is used by each chiller. This causes each chiller to operate at a lower setpoint to achieve the desired chilled water header temperature.

Defines the type of fan output control.

This BACnet Object calculates the fan speed required to achieve the desired condenser water temperature setpoint. NOTE: The following default values should be changed only by a technician trained in PID Loop algorithms.

R: 100 to 100%
D: 2°F R: 0° to 10°F
D: 0-10v R: 0-10v
2-10v

Tower Fan PID

ACTION Update Interval Proportional Integral Derivative Deadband Bias

DIRECT 01:00 (mm:ss) 10 2 0 0 0

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table F — Service Configuration (cont)

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Service Configuration

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

Occ Contact Normal Logic State

Specifies the occupancy contact’s normal logic state.

D: Open R: Open/Closed

RH Sensor Min. Input Volts

The lowest voltage that should be read from the hardwired relative humidity (RH) sensor.

D: 0.00 v R: 0 to 2.00v

RH Sensor Max. Input Volts

The highest voltage that should be read from the hardwired RH sensor.

D: 5.00 V R: 0 to 5.00v

RH Sensor Value at Min. Volts

The % relative humidity that correlates to the hardwired RH sensor’s low D: 0%

voltage reading.

R: 0 to 40%

RH Sensor Value at Max. Volts

The % relative humidity that correlates to the hardwired RH sensor’s high D: 100%

voltage reading.

R: 60 to 100%

Freeze Point Offset

An offset value that allows adjusting of the freeze point read from the chillers.

D: 0°F R: 0° to 10°F

System Space RH

Allows using another controller’s relative humidity value over the network. The remote controller must be equipped with a network-accessible relative humidity sensor value.

D: 999 R: 2 to 100%

System Outdoor Air Temperature

Allows the controller to use an outdoor air temperature value from the network. The remote controller must have a network accessible outdoor air temperature sensor value.

D: 999.00°F R: 50 to 150°F

System Leaving Cond. Water Temperature

Allows using another controller’s leaving condenser water temperature sensor value (system water temperature), to be read over the network. D: 999.00°F The remote controller must have a network-accessible leaving condenser R: 0 to 250°F water temperature sensor value.

System Leaving Load Water Temperature

Allows using another controller’s leaving load water temperature sensor value (system water temperature), to be read over the network. The remote controller must have a network-accessible leaving load water temperature sensor value.

D: 999.00°F R: 0 to 250°F

System Control Setpoint

Allows using another controller’s Control Setpoint value to be read over the D: 999.00°F

network. The remote controller must have a network-accessible point.

R: 0 to 250°F

System Heat Demand Level

The system heat demand level being received over the network.

D: 0.00 R: 0 to 3

System Cool Demand Level

The system cool demand level being received over the network.

D: 0.00 R: 0 to 3

System Occupancy

Allows reading and using another controller’s occupancy status value over the network. The remote controller must have a network-accessible Occupancy Status point.

D: Unoccupied R: Unoccupied/Occupied

The following is a list of available points used to set the alarm output to an alarm state if the alarm condition is true. Set the alarm condition to Enable to turn this feature on for any individual alarm.

CH-1 Linkage Failure Alarm

Enables Chiller #1 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-2 Linkage Failure Alarm

Enables Chiller #2 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-3 Linkage Failure Alarm

Enables Chiller #3 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-4 Linkage Failure Alarm

Enables Chiller #4 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-5 Linkage Failure Alarm

Enables Chiller #5 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-6 Linkage Failure Alarm

Enables Chiller #6 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-7 Linkage Failure Alarm

Enables Chiller #7 Linkage failure alarm.

D: Enable R: Disable/Enable

CH-8 Linkage Failure Alarm

Enables Chiller #8 Linkage failure alarm.

D: Enable R: Disable/Enable

APPENDIX C — 30MP MULTI-CHILLER POINTS/PROPERTIES (cont)
Table F — Service Configuration (cont)

Navigation: i-Vu® / Field Assistant: Properties Control Program Configuration Service Configuration

POINT NAME

DESCRIPTION

DEFAULT (D) / RANGE (R)

CH-1 Alarm State

When set to Enable, Chiller #1’s Alarm State initiates an Equipment D: Enable