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IM 676
Notes for “Electrical Data Single Point” and “Electrical Data Multiple Point” Power:
1. 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.
2. If the control transformer option is furnished, no separate 115v power is required.
3. If a separate 115V power supply is used for the control circuit, then the wire sizing amps is:
•
10 amps for unit sizes ALR032E through ALR075E
•
12 amps for unit sizes ALR080E through ALR185E
4. Recommended power lead wire sizes for 3 conductors per conduit are based on 100% conductor ampacity in
accordance with NEC. Wire sizes for 6 conductors per conduit are based on 80% conductor ampacity in accordance
with NEC. Voltage drop has not been included. Therefore, it is recommended that power leads be kept short. All
terminal block connections must be made with copper (type THW) wire.
5. The unit power terminal block may have 2 lugs per phase. Single or parallel conductors should be used for power
connections as listed under “Recommended Power Lead Wire Size.”
6. “Recommended Fuse Sizes” are selected at approximately 150% of the largest compressor RLA, plus 100% of all other
loads in the circuit.
7. “Maximum Fuse Sizes” are selected at approximately 225% of the largest compressor RLA, plus 100% of all other
loads in the circuit.
8. 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:
Unit Nameplate - 208V/60Hz/3Ph: 187V to 253V (except ALR060E through ALR155E: 187V to 220V)
Unit Nameplate - 230V/60Hz/3Ph: 187V to 253V (except ALR060E through ALR155E: 207V to 253V)
Unit Nameplate - 460V/60Hz/3Ph: 414V to 506V
Unit Nameplate - 575V/60Hz/3Ph: 517V to 633V
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 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 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” - Both Single and Multiple Point Power:
1. Single point power supply requires a single disconnect to supply electrical power to the unit. This power must be
fused.
2. Multiple point power supply requires two independent power circuits each with separate disconnects and a separate
control circuit.
3. All field wiring to unit power block or optional non-fused disconnect switch must be copper.
4. All field wire size values given in table apply to 75° C rated wire per NEC.
