Product manual

22 IOMM ACR/AGR-1
Electrical Data
Field Wiring
Power 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.
AGR-AM and ACR units have internal power wiring for single point power connection. 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.
AGR-AM remote water chillers and CDE chillers are equipped with a 420W electric heater to provide
freeze protection if mounted in locations subject to below freezing temperatures. The heater comes
with a receptacle plug that can be used or removed to hard wire to a power supply.
Control Wiring
AGR-AM chillers are equipped with either a Johnson Controls UNT control or a McQuay MicroTech
microprocessor control mounted in the outdoor unit. The control sensor for capacity control must be
mounted in the leaving chilled water line in a thermowell provided in the water chiller nozzle. A sensor
well is also located in the entering nozzle for use with some control options. The sensor is wired to
the control with 30 ft. of cable. If a longer length is required, it is necessary to field splice the cable.
ACR condensing units are not equipped with a capacity control device and one must be field
furnished and installed. Refer to Figure 12. Four or six steps of control are available.
AGR-AM and ACR units connected to water chillers must have a flow switch mounted in the chilled
water line and wired to the control panel per the field wiring diagram. It is recommended that ACR
units connected to DX air coils have an interlock to prevent compressor operation when there is no air
flow.