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50 Cards in this Set
- Front
- Back
What device terminates the defrost cycle at approximately 60 degrees Fahrenheit? |
Defrost thermostat |
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What is the component responsible for protecting the compressor? |
Accumulator |
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What component makes a heat pump unique? |
Reversing Valve |
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In a heat pump when is the indoor coil a condenser |
Heating mode |
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A heat pump is designed to produce ________ CFM per ton supply airflow. |
450 |
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If a technician connects gauges on the line set of the outdoor unit of a heat pump operating in the heat mode: |
High pressure gauge will read the high side pressure and low pressure gauge will most likely be in the retard. |
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The permanent suction line is connected between: |
The compressor, accumulator and reversing valve. |
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It is common for the outdoor unit to ice up when the heat pump is operated in the cooling mode. True or false? |
False |
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When brazing a four-way reversing valve, heat absorbing paste should be placed around the body of the valve to minimize the chance of internal damage to the valve. True or false? |
True |
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What term best describes the heat loss and gain in a building? |
Balance point |
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What component allows the heat pump to change its cycle? |
Reversing valve |
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On a 45-degree day, the suction pressure on a heat pump should read approximately_______psig. |
33 psig |
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Auxiliary heaters are required when the heat loss is greater than the heat produced by the heat pump. True or false? |
True |
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What device or devices allow a heat pump to go into defrost? |
Defrost clock/Defrost thermostat |
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The auxiliary heater is only energized during defrost. True or false? |
False |
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What control locks out the compressor and energizes the heat strips? |
Emergency heat switch |
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When is The outdoor coil used as a condenser? |
Both B & C |
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What prevents cold air from being circulated to the heated space during the defrost cycle? |
The auxiliary heater turns on to temper the air. |
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The permanent discharge line is connected between? |
Compressor & Reversing Valve |
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during operation, the compressor motor will rotate in the opposite direction to change the direction of refrigerant flow. True or false? |
False |
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it technician goes on a heat pump service call and finds the compressor is extremely hot and the suction line is also hot. What is the problem? |
Reversing valve is leaking internally |
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Scroll compressors need a crankcase heater. True or false? |
False |
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A heat pump compressor is designed to: |
Have higher compression ratio |
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In the heat mode, what device is necessary for proper operation? |
All the above |
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What is the name of the large lines that connects the indoor and outdoor coils to the reversing valve? |
Hot gas line |
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What metering device is the most efficient in a heat pump? |
TXV |
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Where is the permanent discharge line located? |
Compressor to the reversing valve |
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The small line that connects indoor unit to the outdoor unit is the liquid line. True or false? |
True |
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What maximum ambient air temperature can a heat pump be ran in the heating mode? |
65 degrees |
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In a heat pump, when is The outdoor coil in evaporator? |
Heat mode |
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What device isolates electrical power from the control panel? |
Disconnect |
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The best way to charge a heat pump is: |
By weight |
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What can cause excessive heat and pressure in the heat mode? |
Failed indoor motor |
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When working on a heat pump the most important thing to remember is: |
Safety |
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The main piston in a four-way reversing valve is moved by pressure created by: |
Low and high side pressure difference. |
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and the emergency heat mode, the auxiliary heat source becomes the primary heat source and the compressor is disabled. True or false? |
True |
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In a heat pump, the indoor and outdoor coils are the same size. True or false? |
False |
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Does ice on the outdoor coil cause: |
Both B & C |
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Heat pump should only use by flow filter dryers. True or false? |
True |
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What component is not normally used in a heat pump? |
High pressure control |
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In the defrost mode, how is defrost initiated? |
Time and Temperature |
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Which line that connects the indoor unit to the outdoor unit must be insulated? |
Hot gas line |
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What type of filter for / dryer is installed in a heat pump following a compressor change out? |
Bi flow filter drier |
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What is not one of the three zones of the condenser? |
Superheat zone |
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What component is not unique to a heat pump? |
Liquid line |
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A customer's heat pump is not heating. Where do you start first? |
Ask the customer questions |
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What type of thermostat is used with a heat pump? |
Single stage cooling / 2 stage heating |
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The reversing valve is de-energized during defrost. True or false? |
False |
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What is the function of the crankcase heater? |
Both A and B |
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During the heating mode the accumulator: |
Stores refrigerant not needed |