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WIRING – MAIN POWER
Refer to the unit rating plate and/or Table 2 for wire
sizing information and maximum fuse or circuit breaker
size. Each 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 disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect.
See Start Up section for information on three phase
scroll compressor start-ups.
Component Location
ELECTRIC
HEATERS
UNIT
MOUNTED
THERMOSTAT
LOCATION
CONTROL BOX
(OPTIONAL)
FIGURE 15
SIDE FIELD WIRE
ENTRANCE
REMOTE
THERMOSTAT
TERMINAL
BLOCK
INDOOR
BLOWER
BREAKER PANEL
& CONTROLS
LOWER
CONTROL
PANEL
The field wiring connections are located behind the
top and hinged panel in the circuit breaker panel (see
Figure 15).
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 as noted in Table 3.
TABLE 3 – OPERATING VOLTAGE RANGE
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).
OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION
The standard Climate Control Option X is a remote
thermostat connection terminal block. See Figure 17A
on page 22 for wiring diagram. Compatible thermostats
are listed in Table 4. See Figure 17B on page 23 for
Remote CO
Sensor Connection.
2
The Climate Control Option D is an electronic,
programmable thermostat. The subbase of the
thermostat is factory wired to the front panel of the
unit. See Figure 18 on page 24 for wiring diagram. It
is compatible for use with Energy Recovery Ventilator
or Economizer. The thermostat can be set in the
heat, cool or automatic mode. When the thermostat
is set in the heat mode, it can heat only to maintain
the temperature set on the thermostat. When the
thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
When the thermostat is set in the automatic mode,
the thermostat can change automatically to the heat
or cool modes to maintain the temperature set on the
thermostat.
The Climate Control Option H is an electronic,
programmable thermostat and a CO
CIRCUIT
subbase of the thermostat and CO
factory wired to the front panel of the unit. See Figure
19 on page 25 for wiring diagram. The thermostat can
be set in the heat, cool or automatic mode. When the
thermostat is set in the heat mode, it can heat only to
maintain the temperature set on the thermostat. When
the thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
TAP
RANGE
240V
253 – 216
208V
220 – 187
controller. The
2
controller are
2
Manual 2100-601E
Page
19 of 42
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