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

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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