Wiring - Main Power; Wiring - Low Voltage; Digital Thermostat/Controller - Bard W3RV2-R Literature Assembly

WIRING – MAIN POWER
These units are rated for 60/50 Hz operation as follows.
NOTE: This system must be controlled only by the
Bard 8403-066 Digital Thermostat/Controller
that is supplied with the unit. See below
for wiring and pages 17-18 for operating
sequences.
Electrical
Code
Phase
230/208-60-1
-R
220/200-50-1
230/208-60-3
-S
220/200-50-3
460-60-3
-T
400-50-3
Refer to the unit rating plate for wire sizing information
and maximum fuse or 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 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 control access door on this unit may be locked
to prevent unauthorized access to the disconnect. To
lock, insert a padlock through the hole in the lower
portion of one or both of the door latches. This will
prevent the latches from being turned.
See "Start Up" section for important information on
three phase scroll compressor start ups.
See Table 3 on page 22 for Electrical Specifications.
Volts Operating
Hz Voltage
Range
197 - 253
180 - 242
197 - 253
180 - 242
414 - 506
380 - 440
IMPORTANT INSTALLER NOTE
Must be followed for proper operation of all controls.
These models are designed for dual 60/50Hz
operation. –R and –S models use a 240/208Vx24V
control transformer, and are shipped from the factory
on the 208V tap. The –R and –S models may require
reconnection of the 24V transformer primary from 240
to 208V tap for either 60 or 50Hz:
Supply Voltage Hz
253-216 60 or 50
220-180 60 or 50
WIRING – LOW VOLTAGE

DIGITAL THERMOSTAT/CONTROLLER

Terminal Function
+B MSTP + (not used)
-A MSTP - (not used)
IN4 Outdoor Temperature Sensor
IN3 Pressure Transducer
GND Sensor Grounds
IN2 Lockout Alarm
24 COM 24VAC Com
24V 24VAC
OUT 9 Fan Motor Control
GND7-9 Control Ground
OUT 8 Unloader Solenoid Control
OUT 7 Blower Motor Control
RLY 4 Heater Contactor #1
SC 4-6 24VAC to Relay Outputs 4-6
RLY 5 Heater Contactor #2
RLY 6 (not used)
RLY 3 (not used)
SC1-3 24VAC to Relay Outputs 1-3
RLY 2 Compressor Contactor
RLY 1 (not used)
Transformer Primary Tap
240
208
Type Form
Communications
Communications
Input 10K OHM Type 3
0-5 VDC, 0-700
Input
PSIG
Input
Input Relay Closure
Power
Power
Analog Output 0-10VDC
Analog Output
Analog Output 0 or 5VDC PWM
Analog Output 0-10VDC
Relay Output Relay
Power
Relay Output Relay
Power
Relay Output Relay
Manual 2100-615A
Page 13 of 24