Bard Wall Mounted Package Air Conditioners W12A2-A - Manual (Page 12)

Manual 2100-509E
Page 12 of 17
WIRING – MAIN POWER
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” of “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.
For wiring size and connections, refer to Wiring Manual
2100-507.
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).
WIRING – LOW VOLTAGE WIRING
230/208, 1 phase equipment use 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