Unit installation

IOMM ACZ1-2 ACZ 010A through 039A 21
Notes for “Electrical Data”
1. Field Fuse Size for recommended and maximum is based on use of a time-delay fuse.
2. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA
plus 100% of RLA of all other loads in the circuit including the control transformer.
3. Since the control transformer is furnished, no separate 115V power is required.
4. If a separate 115V power supply is used for the control circuit, the wire sizing amps is
10 Amps.
5. Recommended power lead wire sizes for three conductors per conduit are based on
100% conductor ampacity in accordance with NEC. Voltage drop has not been
included. Therefore, it is recommended that power leads should be kept short. All
terminal block connections must be made with copper (type THW) wire.
6. Single conductors should be used for power connections as listed under “Power
Supply/Field Wire Size.”
7. “Recommended Fuse Sizes” are selected at approximately 150% to 175% of the largest
compressor RLA, plus 100% of all other loads in the circuit.
8. “Maximum Fuse Sizes” are selected at approximately 225% of the largest compressor
RLA, plus 100% of all other loads in the circuit.
9. The recommended power lead wire sizes are based on an ambient temperature of 86°F.
Ampacity correction factors must be applied for other ambient temperatures. Refer to
the National Electrical Code Handbook.
Voltage Limitations:
1. Within 10% of nameplate rating.
2. Maximum 2 % voltage unbalance between phases.
Notes for “Compressor and Condenser Fan Amp Draw”:
1. Compressor RLA values are for wiring sizing purposes only but do not reflect normal
operating current draw at rated capacity. If unit is equipped with optional SpeedTrol
condenser fan motors, the first motor on each refrigerant circuit is a single phase, 1hp
motor, with a FLA of 2.8 amps at 460 volts, 5.6 amps at 208, 230, and 575 volts.
2. Compressor LRA for reduced inrush start are for the first winding only. If the unit is
equipped with optional SpeedTrol motors, the first motor is a single phase, 1 hp motor,
with a LRA of 7.3 amps at 460 volts, 14.5 amps at 208, 230, and 575 volts.
Notes for “Field Wiring Data” - Single Point Power:
1. Single point power supply requires a single disconnect to supply electrical power to the
unit. This power must be fused.
2. All field wiring to unit power block or non-fused disconnect switch must be copper.
3. All field wire size values given in table apply to 75°C rated wire per NEC.