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.
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. Compatible for use with Energy Recovery Ventilator or Economizer.
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 3.
TABLE 3
OPERATING VOLTAGE RANGE
TAP | RANGE |
|
|
240V | 253 - 216 |
|
|
208V | 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).
The standard Climate Control Option X is a remote thermostat connection terminal block. See Figure 17 for wiring diagram. Compatible thermostats are listed in Table 4.
CAUTION
Do not plug in or unplug blower motor connec- tors while the power is on. Failure to do so may result in motor failure.
FLUID CONNECTIONS
See Figure 1 for location of fluid connection. Connection size is 1” FPT.
If the free blow plenum box is to be used, there are knock outs in the top of the box that can be removed to allow passage of the fluid piping.
All plumbing to and from the unit is to be installed in accordance with local plumbing codes. The use of plastic pipe where permissible is recommended to prevent electrolytic corrosion of the fluid pipes.
It is strongly recommended that the fluid piping to the unit be insulated to prevent water droplets from condensing on the pipe surface.
TABLE 4
WALL THERMOSTATS AND SUBBASE COMBINATIONS
Thermostat | Subbase | Predominant Features | |
N/A | Manual / Auto / Heat / Cool | ||
Programmable Electronic | |||
|
Manual
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