Operating instructions

Notes for “Electrical Data Single- and Multi-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. The control transformer is furnished on the unit and no separate 115V power is required.
For both single- and multi-point power connections, the control transformer is in circuit
#1 with control power wired from there to circuit #2. In multi-point power,
disconnecting power to circuit will disconnect all control power to the unit.
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. 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. “Recommended Fuse Sizes” are 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 at approximately 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.
Voltage Limitations:
Within ± 10 percent of nameplate rating.
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.
Notes for “Field Wiring Data”
1. Requires a single disconnect to supply electrical power to the unit. This power supply
must either be fused or use an HACR type circuit breaker.
2. All field wiring to unit power block or optional non-fused disconnect switch must be
copper.
3. All field wire size values given in table apply to 75°C rated wire per NEC.
Circuit Breakers
Factory installed circuit breakers are standard on units with single point power supply only. This
option provides unit installed compressor short circuit protection and makes servicing easier.
Disconnect
Swt.
Circuit
Breakers
High Short
Circuit Current
Connection Type Power Block
Single Point (Standard) Std Opt. Std Opt
Multi-Point (Optional) Std Opt. Not Avail. Opt.
IMM ACZ/AGZ-4 ACZ / AGZ-BM 49