WIRING – MAIN POWER
Refer to the unit rating plate and/or Table 2 for wire sizing information and maximum fuse or “HACR Type” 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 “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.
The field wiring connections are located behind the top panel in the circuit breaker panel. The return air panel must be removed first. This panel is equipped with a door switch, which shuts the unit down when it is removed. The filter rack must be removed next.
TABLE 2
OPERATING VOLTAGE RANGE
TAP | RANGE |
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240V | 253 - 216 |
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208V | 220 - 187 |
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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).
The standard Climate Control Option X is a remote thermostat connection terminal block. See Figure 14 for wiring diagram. Compatible thermostats are listed in Table 3.
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 15 for wiring diagram. Compatible for use with Energy Recovery Ventilator or Economizer.
The Climate Control Option H is an electronic, programmable thermostat and CO2 controller. The subbase of the thermostat and CO2 controller are factory wired to the front panel of the unit. See Figure 16 for wiringdiagram.
GENERAL
This unit is equipped with a variable speed ECM motor. The motor is designed to maintain rated airflow up to the maximum static allowed. It is important that the blower motor plugs are not plugged in or unplugged while the power is on. Failure to remove power prior to unplugging or plugging in the motor could result in motor failure.
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 2.
CAUTION
Do not plug in or unplug blower motor con- nectors while the power is on. Failure to do so may result in motor failure.
| TABLE 3 |
| WALL THERMOSTATS |
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Thermostat | Predominant Features |
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| 3 stage Cool; 3 stage Heat |
HP or Conventional | |
| Auto or Manual changeover |
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Manual | |
Page | 18 of 46 |