Icm Head Pressure Control Wiring Diagram

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HVACR Tech Tip: Electric Head Pressure Control ... from cdn.app.compendium.com

Integral heat pump bypass circuitry allows electronic bypass of the speed control during heat pump operation. Due to the drop in fuel pressure in the control chamber, the fuel pressure placed on the needle is greater, pushing the needle upwards and allowing injection to begin. (this wiring diagram is for those creating their own harness for a v2.2 main board.

• the discharge valve wiring has been deleted from the edu wiring diagram.

The little black box is a relay, most likely used as a starter cut relay controlled by the alarm. Operated by heat and magnetism which is proportional to current draw. Integral heat pump bypass circuitry allows electronic bypass of the speed control during heat pump operation. Head pressure is regulated during low ambient conditions by varying the amount of airflow through the condenser.