Manual 2100-410G
Page
14 of 25
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 muse 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 locate 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.
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).
Ten (10) 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 8.
IMPORTANT
Only the thermostats shown in this Manual
have been tested with this equipment for
proper operation. Proper unit operation with
thermostats not listed in this Manual, cannot
be assured.
You assume responsibility for proper
operation of the unit when using thermostats
other than those listed above.
FIGURE 8
UNIT 24V TERMINAL BOARD
