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How does the high head pressure protection feature work on the ACSC?

How does the high head pressure protection feature work?
Product line:
ACSC100, ACSC101
InRow Cooling
The unit targets a refrigerant condensing pressure of 425 psig (29.3 bar) and the condenser fans modulate to maintain this. The high head pressure switch trip limit is 550 psig (37.9 bars). When condensing pressure reaches 520 psig (35.8 bars), the controller slows the evaporator fans down and opens the electronic hot gas bypass valve to reduce condensing pressure.

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