Installation Instructions for Bard 11EER WA Series Wall Mount Air Conditioner

Quick guide from the manual

This document provides installation and service instructions for the Bard 11EER WA Series wall-mount air conditioner. Key procedures include wall mounting, ductwork connection, electrical wiring, and system startup. The unit uses R-454B refrigerant and includes advanced features like Balanced Climate mode and a Refrigerant Leak Detection System (RDS). Always ensure the unit is installed by trained, experienced technicians in accordance with local and national codes.

Safety Instructions

Warning: This unit contains mildly flammable R-454B refrigerant. Follow all safety precautions, including:

• Maintain a minimum 1/4 inch clearance between the supply air duct and combustible materials in the first 3 feet of ducting.
• Always disconnect remote electric power supplies before servicing.
• Use more than one person to handle the unit due to its weight.
• Do not operate without an earth ground.
• Auxiliary devices that are potential ignition sources (e.g., hot surfaces >700°C) must not be installed in the ductwork.

Installation

Successful installation requires proper site inspection and planning. Ensure the wall is strong enough to support the unit and that service clearances are met.

Wall Mounting

1. Prepare the wall by cutting holes for supply and return air as specified in the mounting instructions.
2. Install the bottom mounting bracket to help support the unit during installation.
3. Apply a liberal amount of caulk to the cabinet side wall mount brackets and the back of the top rain flashing.
4. Secure the unit to the wall using field-supplied fasteners through the built-in wall mounting brackets.
5. Apply a bead of caulk between the back of the unit top and the front surface of the top rain flashing to prevent water entry.

Ductwork

All ductwork must be properly sized and insulated. Flexible joints should be used to minimize noise transmission. If no return air duct is used, a metallic return air grille with louvers no larger than 5/8 inch is required.

Wiring

Main Power

Verify voltage is consistent with unit specifications. Use copper conductors only. Refer to the unit serial plate for maximum fuse or circuit breaker size.

Low Voltage (24VAC) Connections

• C: 24VAC common (grounded).
• G: Indoor blower input.
• Y1: 1st Stage cooling input.
• Y2: 2nd Stage compressor input.
• B/W1: 1st stage electric heat.
• W2: 2nd stage heat.
• A: Ventilation input.
• D: Dehumidification input.

System Features

Balanced Climate Mode

This mode enhances comfort by reducing indoor airflow and extending run time to improve humidity removal. To enable, remove the Y1-Y2 jumper bar. A 2-stage cooling thermostat is recommended for optimal performance.

Refrigerant Leak Detection System (RDS)

The RDS monitors for refrigerant leaks. If a leak is detected, the system enters mitigation mode: the indoor blower is activated, compressor and electric heat operation are prohibited, and the 'L' terminal is energized to trigger an alarm.

Service and Maintenance

Troubleshooting ECM Motors

If the motor is running but noisy or not changing speeds, check for programmed delays, ensure control inputs are wired correctly, and verify that all dampers/registers are open. Check external static pressure to ensure it is within limits.

Setting Unit Airflow

The unit has five factory-programmed speed taps. The default speed is the lowest cooling speed. To change speeds, move the orange/black wire on the blower speed terminal block to the desired tap (MED or HI). Refer to the airflow performance graphs for specific CFM values.

Dirty Filter Switch

The switch measures pressure drop across the filter. It is adjustable; the recommended starting point is 0.4 inch W.C. Adjust the knob clockwise to increase the restriction required to activate the switch.