Manual 2100-408C
Page
11
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 (75ºC
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.
Nine (9) wires should be run from thermostat subbase to
the 24V terminal board in the unit. A nine conductor, 18
gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in
Figure 7 and 8.
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:
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).
p
a
T
e
g
n
a
R
0
4
2
8
0
2
6
1
2
-
3
5
2
7
8
1
-
0
2
2
IMPORTANT
Only the thermostat and subbase combinations
as shown in this manual are assured by Bard to
work with this equipment.
The thermostat and subbase
must
be matched,
and the correct operation can be assured only
by proper selection and application of these
parts.
