20 AGR 055A through 100A IOMM AGR
Notes for “Electrical Data Single 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, a separate 115v power is not required.
3. If a separate 115V power supply is used for the control circuit, then the wire sizing amps is 10
amps for all unit sizes.
4. Recommended power lead wire sizes for 3 conductors per conduit are based on 100% conductor
ampacity in accordance with NEC. Nominal voltage drop has been included. It is
recommended that power leads be kept short. All terminal block connections must be made
with copper (type THW) wire.
5. “Recommended Fuse Sizes or HACR breaker size” is selected at approximately 150% to 175%
of the largest compressor RLA, plus 100% of all other loads in the circuit.
6. “Maximum Fuse or HACR breaker size” is selected based on 225% of the largest compressor
RLA, plus 100% of all other loads in the circuit.
7. The recommended power lead wire sizes are based on an ambient temperature of 86°F (30°C).
Ampacity correction factors must be applied for other ambient temperatures. Refer to the
National Electrical Code Handbook.
8. Must be electrically grounded according to national and local electrical codes.
9. The MCA may vary slightly due to motor options such as SpeedTrol, TEFC.
Voltage Limitations:
Within ± 10 percent of unit nameplate rating
Notes for “Compressor and Condenser Fan Amp Draw”:
1. Compressor RLA values are for wiring sizing purposes only and may be higher than nominal
operating current draw at rated capacity.
2. 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.
3. Compressor LRA for reduced inrush start are for the first winding of part-winding start only.
4. 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”
1. The standard unit requires a single disconnect to supply electrical power to the unit. Power
supply must either be fused or use an HACR type circuit breaker.
2. Multiple point power connection for field wiring is available as an option. Two power terminal
blocks are supplied in the unit, one for each system in the unit. Each power terminal block
supplies both compressor and fan motor power for each system. If the control transformer
option is furnished, it is connected to the system #1 power terminal block.
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. Following NEC
guidelines for other wire ratings such as 90°C.
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