6 why must the valve positioning important to keep

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6) Why must the valve positioning important?
7) When installing a new valve, it should be protected from getting too hot. What is the maximum temperature the valve body will tolerate?
8) The service problems with heat pumps fall into three main categories. What are they?
9) What are the two areas of refrigeration problems in a heat pump system?
10) List four common problems with check valves on a heat pump system.
11) What are the indications a check valve has stuck closed on an outside coil?
12) Name the four most predominant defrost systems.
13) A temperature-differential defrost system will not go into defrost. This is the

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