单项选择题

When you adjust a thermostatic expansion valve, （）.

A.refrigerant must be bled off the sensing line before adjustments are made
B.all refrigerant must be pumped into the receiver before adjustments are made
C.time must be allowed for conditions to stabilize in the evaporator before further adjustments are made
D.all refrigerant must be routed through the dehydrator while changing the superheat setting

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If a centrifugal pump were continually operated with the discharge valve closed, the （）.

A.motor controller overload would open
B.pump would eventually overheat
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A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.

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