Specifications

Manual 2100-399D
Page 13 of 23
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 7.
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 — 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.
See Start-up section for 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:
paTegnaR
042
802
612-352
781-022
FIGURE 7
UNIT 24V TERMINAL BOARD