Bard W3RV1, W6RV1, W5LV1 Wiring Main Power, Wiring LOW Voltage Wiring, TAP Range, 240 253 208 220

WIRING – MAIN POWER

These units are rated for 60/50 Hz operation as follows.

NOTE: This system must be controlled only by the Bard 8403-064 Digital Thermostat/Controller that is supplied with the unit. See below for Wiring and Pages 16-17 for Operating Sequences.

	Volts	Operating
Electrical	Hz	Voltage
Code	Phase	Range
-R	230/208-60-1	197 - 253
	220/200-50-1	180 - 242
-S	230/208-60-3	197 - 253
	220/200-50-3	180 - 242
-T	460-60-3	414 - 506
	400-50-3	360 - 440

Refer to the unit rating plate for wire sizing information and maximum fuse or “HACR” type circuit breaker size. Each outdoor 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 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. To convert for the locking capability, bend the tab located in the bottom left-hand corner of the disconnect opening under the disconnect access panel straight out. This tab will now line up with the slot in the door. When shut, a padlock may be placed through the hole in the tab preventing entry.

See “Start Up” section for important information on three phase scroll compressor start ups.

See Table 3 for Electrical Specifications.

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:

TAP	RANGE
240	253 – 216
208	220 – 187

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

DIGITAL THERMOSTAT/CONTROLLER

Terminal	Function	Type	Form
+B	MSTP + (not used)	Communications
-A	MSTP - (not used)	Communications
IN4	Outdoor Temperature Sensor	Input	10K OHM Type 3
IN3	Pressure Transducer	Input	0-5 VDC, 0-700 PSIG
GND	Sensor Grounds	Input
IN2	Lockout Alarm	Input	Relay Closure
24 COM	24VAC Com	Power
24V	24VAC	Power
OUT 9	Fan Motor Control	Analog Output	0-10VDC
GND7-9	Control Ground	Analog Output
OUT 8	Unloader Solenoid Control	Analog Output	0 or 5VDC PWM
OUT 7	Blower Motor Control	Analog Output	0-10VDC
RLY 4	Heater Contactor #1	Relay Output	Relay
SC 4-6	24VAC to Relay Outputs 4-6	Power
RLY 5	Heater Contactor #2	Relay Output	Relay
RLY 6	(not used)
RLY 3	(not used)
SC1-3	24VAC to Relay Outputs 1-3	Power
RLY 2	Compressor Contactor	Relay Output	Relay
RLY 1	(not used)

8403-066 DIGITAL
CONTROLLER		UNIT LOW
+B	OUT 9	VOLTAGE
		TERMINAL
-A	GND 7-9
		BLOCK
IN4	OUT 8
		F
IN3	OUT 7
GND	RLY 6	E
IN2	SC 4-6
24 COM	RLY 5
24V	RLY 4	Y1

RLY 3
SC 1-3	G
RLY 2
RLY 1	W1
	W2
	Y
	R
	C
	1
	2
	3
	4
	5
	6
	7
	MIS-2852 C

Manual	2100-538E
Page	13 of 23