单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve
单选题
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
A
the relief valve should open before the high pressure cutout
B
the relief valve should open and allow the excess refrigerant to flow to the receiver
C
the high pressure cutout switch should operate before the relief valve opens
D
you should close in on the suction valve
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