Honeywell DB7110U1000 Universal Single-Stage Heat Pump Defrost Control

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Universal Defrost Control for Single Stage On/Off Heat Pumps. It provides control of the outdoor equipment; compressor contactor, reversing valve, and outdoor fan in response to thermostat requests and air and coil temperatures. It also controls the indoor auxiliary heat source that is used during defrost operations and often as a second stage of heat. A defrost cycle is triggered based on outdoor air and outdoor coil temperatures that are measured using included temperature sensors.

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