Bard QH422, QH243, QH602, QH482 Wiring Main Power, Wiring LOW Voltage Wiring, Component Location

WIRING – MAIN POWER

Refer to the unit rating plate and/or Table 2 for wire sizing information and maximum fuse or “HACR Type” circuit breaker size. Each unit is marked with a “Minimum Circuit Ampacity”. This means that the field wiring used must be sized to carry that amount of current. Depending on the installed KW of electric heat, there may be two field power circuits required. If this is the case, the unit serial plate will so indicate. All models are suitable only for connection with copper wire. Each unit and/or wiring diagram will be marked “Use Copper Conductors Only”. These instructions MUST BE adhered to. Refer to the National Electrical Code (NEC) for complete current carrying capacity data on the various insulation grades of wiring material. All wiring must conform to NEC and all local codes.

The electrical data lists fuse and wire sizes (75°C copper) for all models, including the most commonly used heater sizes. Also shown are the number of field power circuits required for the various models with heaters.

The unit rating plate lists a “Maximum Time Delay Relay Fuse” or “HACR Type” circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection, and also to assure that

FIGURE 14

COMPONENT LOCATION

	SIDE FIELD WIRE
	ENTRANCE
ELECTRIC
HEATERS
	REMOTE
	THERMOSTAT
UNIT	TERMINAL
MOUNTED	BLOCK
THERMOSTAT
LOCATION
	INDOOR
	BLOWER
DEHUMIDIFICATION
CONTROL
(OPTIONAL)
	CIRCUIT
	BREAKER PANEL
	& CONTROLS
	LOWER
	CONTROL
	PANEL

there will be no nuisance tripping due to the momentary high starting current of the compressor motor.

The disconnect access door on this unit may be locked to prevent unauthorized access to the disconnect.

See Start Up section for information on three phase scroll compressor start-ups.

The field wiring connections are located behind the top and hinged panel in the circuit breaker panel. See Figure 14.

WIRING – LOW VOLTAGE WIRING

230/208V, 1 PHASE AND 3 PHASE EQUIPMENT DUAL PRIMARY VOLTAGE TRANSFORMERS.

All Equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are as noted in Table 3.

TABLE 3

OPERATING VOLTAGE RANGE

TAP	RANGE
240V	253 – 216
208V	220 – 187

NOTE: The voltage should be measured at the filed power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition).

The standard Climate Control Option X is a remote thermostat connection terminal block. See Figure 16 for wiring diagram. Compatible thermostats are listed in Table 4.

The Climate Control Option A is an electronic, non- programmable manual or auto changeover thermostat. The subbase of the thermostat is factory wired to the front panel of the unit. See Figure 17 for wiring diagram. Compatible for use with Bard CS2000A1 Controller and Energy Recovery Ventilator.

The Climate Control Option D is an electronic, programmable thermostat. The subbase of the thermostat is factory wired to the front panel of the unit. See Figure 18 for wiring diagram. Compatible for use with Energy Recovery Ventilator or Economizer.

NOTE: On option X or A the CS2000A1 (or other field provided means to control ventilation) must be used if any of the motorized ventilation options are installed.

Manual	2100-420H
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