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ELECTRIC DEFROST — 208/230/1/60 — (1) UNIT COOLER WITH HEATER CONTACTOR
Sub-circuit fusing or service disconnect switches are not shown but may be required as per the NEC and / or local codes.
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It is the responsibility of the installing contractor to interpret and comply with all applicable electrical codes.
The defrost time clock, block out relay / auxiliary switch and heater contactor are typically located in the system condensing
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unit. All unit cooler power should feed from this unit. Make sure the total heater amp draw does not exceed the resistive rating
of the contactor. Also be sure the wire gauge size is adequate to carry the total amp load required.
When using a heater contactor with unit cooler defrost heaters factory wired for single phase remove factory installed jumper
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between terminals 2 & 3 on TB1 and wire directly to heater contactor as shown above.
The room thermostat and liquid line solenoid valve are shown as field installed but may be factory mounted in the unit cooler.
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Make sure the solenoid holding coil is wired for the correct control voltage (115 or 230).
FIELD WIRING DIAGRAMS — TYPICAL
IMPORTANT WIRING NOTES - INSTALLER PLEASE READ CAREFULLY!
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