18
IM 676
Electrical Data
Field Wiring
CAUTION
Internal power wiring to the compressors for single and multiple point option are different. Field wiring must be
installed according to unit wiring diagram.
Wiring must comply with all applicable codes and ordinances. Warranty is void if wiring is not in accordance with
specifications. Copper wire is required for all power lead terminations at the unit. Aluminum or copper can be used for all
other wiring.
ALR units may be ordered with internal power wiring for either single or multiple point power connection. If single
point power connection is ordered, a single large power terminal block is provided and wiring within the unit is sized in
accordance with the National Electrical Code. A single field supplied fused disconnect is required. An optional factory
mounted transformer may be installed.
If multiple point power wiring is ordered, three power connections, one per compressor circuit, one for condenser fans,
and control circuit, are required. Separate field supplied fused disconnects are required for each of the three circuits. A
single power block is provided for all of the condenser fans and the optional 115V control transformer.
If the evaporator heater is on a separate disconnect switch from the main unit power supply, the unit may be shut down
without defeating the freeze protection provided by the cooler heater.
