A head pressure controller made to maximize effectiveness and safeguard your HVAC system is the Hoffman Controls 816-10DH. This little unit uses condensers with 120–600V, and 10A motors and runs on 24V AC. It regulates head pressure in low ambient settings by varying the condenser fan speed dependent on the temperature of the liquid line. The 816-10DH prevents excessive subcooling, which can result in decreased system performance and possible damage, by regulating airflow through the condenser.

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https://www.partshnc.com/816-10dh-hoffman-controls-24v-120-600v-10a-head-cntrl