Heat Pump Refrigeration Cycle

1. True or False: All heat pumps will have one metering device that works in heating and cooling mode.

True False

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2. What valve must shift before the reversing valve can shift?

Check valve Electronic expansion valve (EEV) King valve Pilot solenoid valve

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3. True or False: Reversing valves are always ENERGIZED in cooling mode.

True False

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4. What happens about midway through the condensing unit when we have a liquid-vapor mixture?

The liquid line solenoid valve shuts The pump-down cycle begins The refrigerant is saturated The refrigerant blend starts to fractionate

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5. When working with refrigerant blends with glide, you use the _____________ point for the lower limit of the saturation range (liquid) and the __________________ point for the upper limit (vapor).

Bubble, dew Dew, bubble Subcooling, superheat Superheat, subcooling

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6. In heat pumps, liquid line filter-driers must:

Allow for refrigerant flow in two directions (bi-flow) Double as metering devices Specifically contain activated aluminum Work in conjunction with a suction line filter drier

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7. True or False: Like POE oil, PVE oil is hygroscopic, but PVE oil doesn't undergo hydrolysis in the same way as POE oil

True False

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8. What causes flash gas at the metering device?

Distributor tubes Evaporator starving (high superheat) Lack of pressure and space for the incoming subcooled liquid Vapor injection

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9. What is an accumulator?

A muffler on the discharge line to reduce vibration and noise A storage vessel for liquid refrigerant before the compressor An optional accessory to catch acids Same thing as a suction line filter drier

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10. What is the purpose of distributor tubes?

To withhold refrigerant from the evaporator coil To provide the pressure differential required to shift the reversing valve To provide another obstacle you need to avoid when routing wires To distribute refrigerant throughout the lower rows of the evaporator coil after the metering device

Heat Pump Refrigeration Cycle