Bard Air Conditioning System Installation Instructions
Introduction
This document provides installation instructions for the Bard MULTI-TEC Wall-Mount Air Conditioner and the LC6000 Supervisory Controller. The system is designed to work together as a complete unit for climate control in various environments, particularly telecom and motor control center rooms.
Note: The LC6000 supervisory controller and MULTI-TEC wall-mount units are designed to work together. They must be used as a complete system.
System Components
The Bard Air Conditioning System includes:
- MULTI-TEC Wall-Mount Air Conditioner (e.g., W42-72AC models)
- LC6000-200 Supervisory Controller
- TEC-EYE™ Hand-Held Diagnostic Tool (Bard P/N 8301-059)
- Remote Temperature/Humidity Sensor (Bard P/N 8403-079)
- 35' 5-Wire 18 Gauge Shielded Cable
- Communication EMI Filters (Bard P/N 8301-055)
Optional sensors include:
- Outside Air Temperature/Humidity Sensor (Bard P/N 8301-090)
- Remote Temperature/Humidity Sensor (Bard P/N 8403-079)
- Remote Temperature Only Sensor (Bard P/N 8301-058)
Note: Additional remote sensors may be required for multi-zone installations. Refer to the manual for specific requirements.
General Information
This equipment is intended for installation by trained and experienced service and installation technicians. The refrigerant system is pre-charged and all internal wiring is complete. The units are designed for use with or without ductwork, with flanges provided for connection.
Safety Precautions:
- Always disconnect power before servicing.
- Use caution with electrical hazards.
- Follow all national and local codes.
- Refer to ACCA standards for sizing calculations.
- Check for shipping damage upon receipt.
Site Preparation
Model Identification
Identify the specific model using the nomenclature information and the model/serial tag on the unit. Refer to Figure 2 for unit dimensions and critical installation requirements.
Minimum Clearance
Maintain a minimum of 20 inches clearance on the sides for side-by-side installations to allow access to heat strips and proper airflow. For units with control panels facing inward, maintain a minimum of 36 inches clearance. Additional clearance may be required by local codes.
For units with blow-through condensers, maintain a minimum distance of 10 feet between the front of the unit and any barrier, or 20 feet between the fronts of two opposing units.
Clearance to Combustibles
A 1/4 inch clearance to combustible material is required for the first 3 feet of duct attached to the outlet air frame. A 1-inch clearance is generally recommended for ease of installation and to maintain the required clearance to combustible material.
WARNING: Failure to maintain minimum 1/4" clearance between the supply air duct and combustible materials in the first 3' of ducting could result in fire causing damage, injury, or death.
Wall-Mount Unit Mounting
WARNING: Use more than one person to handle the unit to avoid unit damage or serious injury.
Units are secured by full-length mounting flanges. A bottom mounting bracket, attached for shipping, can be used for installation but is not required.
The unit requires 0" clearance, but the supply air duct flange and the first 3 feet of supply air duct require a minimum of 1/4" clearance to combustible material. A 1" clearance is recommended.
Ensure that the wall construction is strong and rigid enough to support the unit's weight and prevent vibration. Modifications to wall openings may be necessary for retrofit installations.
Drainage: The unit has a drain pan with a hose. If connected to a drain system, it must be an open or vented type system to ensure proper drainage.
Wall-Mount Unit Wiring
Main Power Wiring
WARNING: Disconnect power before servicing to prevent electric shock or death.
Refer to the unit rating plate or electrical specification tables for wire sizing and maximum fuse or circuit breaker size. All models require copper conductors only. Wiring must conform to the National Electrical Code (NEC) and all local codes.
The unit rating plate indicates the maximum circuit breaker or fuse size. Use the correct size for proper circuit protection.
Route all field wires to the right of the wire shield as shown in the circuit routing label.
Low Voltage Wiring
For 208V operation, reconnect from the 240V tap to the 208V tap. Acceptable operating voltage ranges are provided for both taps. Voltage should be measured at the field power connection point while the unit is operating at full load.
An 18-gauge copper, color-coded cable is recommended for low voltage wiring.
Preliminary Start Up
Running in Orphan Mode
In orphan mode, the wall-mount unit operates independently of the LC6000 controller, maintaining shelter temperature using the return air sensor. This mode is useful during installation or if communication is lost.
The unit can be turned on or off using the TEC-EYE diagnostic tool. To set cooling and heating setpoints in orphan mode, use the TEC-EYE to access the Main Menu, then navigate to Setpoints.
LC6000 Controller Installation
Mounting the LC6000 Controller
The LC6000 controller dimensions are 16" x 12" x 6". It can be installed in any suitable indoor location, preferably at eye level. Mounting holes and conduit knockouts are provided.
Ensure that the four fused power supply terminals have fuses in the active position before connecting wires.
Installing Remote Indoor Temperature/Humidity Sensor(s)
One remote sensor is included. Mount the sensor in a location least affected by environmental factors, approximately 60 inches above the floor. Use shielded cable for connection. The maximum cable length is 98 feet.
Ensure jumpers are set correctly for 0-1V operation. Refer to Figure 13 and sensor cover illustrations for details.
Installing Optional Outdoor Temperature/Humidity Sensor
An optional outdoor sensor can be installed using 18-gauge shielded cable. Maximum cable length is 98 feet. Refer to Figure 15 for wiring details.
Emergency Off, Emergency Ventilation and Generator Run Connections
Factory-installed jumpers are present for these functions. Remove jumpers before making connections. Normally closed (NC) contacts are required.
Communication Wiring
Connect communication wiring from wall-mount units to the controller using either a daisy chain or alternate method, as shown in Figures 17, 18, or 19. Use 2-wire, 18-gauge shielded cable with drain. Route communication wiring and power supply wiring in separate conduits. Attach communication wire filters as shown.
Daisy Chain Wiring: Filters are placed at the end units.
Alternate Wiring: Filters are placed at the end units. The LC6000 can be in any position other than the start or end.
Termination at Controller: Connect one wire to terminal #56 (negative), one to #57 (positive), and the drain wire to ground terminal #60. Attach EMI filter at the intersection of the service loop.
Termination at Wall-Mount Unit: Extend shielded cable through a separate conduit to the terminal block. Match polarity (+/-) symbols. Connect wires to controller terminals. Leave drain wire loose or cap with a wire nut.
Supply Wiring
The LC6000 controller is powered by 120, 208, or 240 volts. Use minimum 16-gauge, maximum 14-gauge field-supplied wiring. A reliable earth ground must be connected in addition to any grounding from conduit. Use the supplied grounding bolts and nuts, and a field-supplied 2-hole grounding lug.
System Set Up
The LC6000 controller and TEC-EYE hand-held diagnostic tool are used for system setup. The TEC-EYE is used for wall-mount units.
Setting Up Wall-Mount Units for Operation
- Address Each Wall-Mount Unit: Assign a unique address (1-14) to each unit for proper system operation. Access via MENU > Sys Config > Unit Address.
- Execute a Self Test on Each Unit: Verify correct operation. Access via MENU > Sys Config > Self Test.
- Clear Unit Alarm Logs on Each Unit: Clear any logged alarms. Access via MENU > Settings > Initialization > Delete alarm logs?.
Setting Up LC6000 for Operation
- Set LC Controller Date and Time: Configure the system's date and time. Access via MENU > Settings > Date/Time.
- Configure Sensors: Enable or disable installed temperature and humidity sensors. Access via MENU > IO Config. Follow on-screen prompts to enable/disable sensors for Zone 1, Zone 2, and Zone 3, and for outdoor sensors.
- Enter Total Number of Units: Input the total number of connected wall-mount units. Access via MENU > Sys Config > General > Total Units.
- Verify Units Are Online: Check that all units are communicating with the LC controller. View status via the Status screen and Information icon.
- Select Economizer Type for Each Zone: Configure economizer settings (None, Drybulb, TempHum, Enthalpy) for each zone. Access via MENU > Sys Config > Zone FC Settings.
- Clear Controller Alarm Logs: Clear any alarms logged during testing. Access via MENU > Settings > Initialization > Delete alarm logs?.
Additional Information
Menu Screens and Password Levels
Refer to the manual for a detailed breakdown of menu screens and required password levels for both MULTI-TEC Wall-Mount Units and the LC6000 Controller.
Setpoints
LC6000 setpoints are used for temperature control when communicating with wall-mount units. In orphan mode, the wall-mount unit's own setpoints are used. LC6000 setpoints sync to the wall-mount units once communication is established.
Calibrating Sensors
Sensors can be calibrated by adjusting the offset value. Access this function via MENU > I/O Config > scroll to sensor > Offset.
Conclusion
Once all installation steps are completed, alarms are cleared, and system verification is satisfactory, the installation is considered complete. Refer to MULTI-TEC Service Instructions 2100-725 and LC6000 Service Instructions 2100-669 for additional programming information.
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