Mueller E-Star OESE 3.5 and 5 HP HFC Condensing Unit
Installation and Operation Manual, Part No. 8828747
Effective April 13, 2020
2.5
ELECTRICAL CONNECTIONS
Prior to installation, verify equipment is compatible with site electrical requirements (e.g., voltage, phase, and
hertz). Ensure that all electrical connections are secure and correspond with wiring schematics.
Following local and National Electrical Code (NEC) regulations and procedures, connect a fused-disconnect power
supply of the proper voltage and phase to the condensing unit’s electrical enclosure.
The control circuit is designed to be operated by a 24-VAC supply. See warning statement below.
Refer to the electrical schematics in Section 7 for connection details.
WARNING: Mueller E-Star OESE condensing units are prewired for low-voltage, 24-VAC control
circuit input. Connecting high-voltage control to this circuit will cause equipment failure and a possible
electrical hazard.
The control circuit can be modified for high-voltage supply in installations that do not utilize a Mueller low-voltage
refrigeration control. Refer to Section 7.0 for details.
2.6
PUMP-DOWN INSTALLATIONS
An optional hard start kit is available for single-phase models utilizing a refrigerant pump-down solenoid. refer to
Section 7.0 for details and part numbers.
A discharge check valve, Part No. 8820260 for 5-HP models and 8820255 for 3.5-HP models, must be installed in
the compressor’s discharge line for pump-down installations.
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