1.In a heat pump thermostat explain the operation of the two stage heating mode?
2.What is the purpose of the filter dryer?
3.What are the internal parts of a reversing valve?
4.Why does a heat pump need two metering devices?
5.Why is a TEV a better metering device for the heat mode?
6.Why are check valves used in heat pumps?
7.What is the purpose of a suction line accumulator in a heat pump?
8.Name 3 situations were accumulators are needed to protect the compressor in a heat pump?
9.Why are compressor crankcase heaters necessary?
10.List 4 conditions in which a defrost circuit may be activated?
11.explain why supplemental / auxiliary heat is required on all air to air heat pumps?
12.What does the OAT control and why is it needed?
13.What is the purpose of the Hold back thermostat ?
14.Why is the bleed holes very small?
15.How can the Metering devices be arranged in the heat pump system?
16.What type of charge does the sensing bulb in a TEV have?
17.Explain the use and operation of a bi-flow dryer ?
18.What is the industry standard for determining the heat gain of a residential system?
19.What is the minimum SEER rating for a new system?
20.Why are sections of pipe sometimes swagged ?
21.For a system using a non - TEV metering device such as a fixed orifice / what method can be used to determine that the refrigerant charge is adequate ?
22.What is the typical temperature differential setting between a heat pump running in 1st stage and calling for 2nd stage?
23.Describe Balance point?
24.Name 3 parts found in a heat pump not found in a/c?
25.How is SEER calculated?
26.Explain demand and timed system responses?
27.Explain passive recovery in detail?
28.Explain active recovery in detail?
29.The E.A.T. - L.A.T * ?
30.If the suction line has a restriction the pressure will be ?
31.What measures wet bulb and dry bulb temps?
32.Define wet bulb temp?
33.Define dry bulb temp?
34. What could cause a liquid line restriction ? - List 3 answers
35.Typically heat pump supply air should range from ____ to _____?
36._____ ______ can eliminate the use of a accumulator?
37.Explain how to get superheat?
38.Explain how to get sub-cooling?
39.Area x Velocity * _________
40.What type of heat pump has no need for defrost cycle?
This is a start and I do understand this is all probably common knowledge to you pro's , but thought I would share .