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23 Cards in this Set
- Front
- Back
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If 2 objects have different temps. And are close to 1 another, heat energy travels in what direction, if any? |
From the warmer object to the cooler object. 13-4 |
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A sizable amount of refrigerant -134 in the atmosphere may cause what result? |
Suffocation |
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When warming a container of refrigerant-12, you should not exceed what temp? |
125* |
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What is the purpose of the desiccant located in the receiver? |
It removes moisture from the system |
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The relief valve opens between approx. what pressure range? |
450-500 psi |
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When you observe bubbles in the site glass of an air conditioning system, what does it indicate. |
That the system is undercharged. |
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The expansion tube retards refrigerant flow and performs what other functions? |
It regulates refrigerant entering the condenser. |
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The evaporator should be kept above what temperature in degrees. |
32* |
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Where is the thermostatic switch sensing bulb located in an air conditioning system? |
In the airstream after the evaporator |
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In an air conditioning system, what does the suction throttling valve limit? |
The amount of low pressure vapor entering the compressor |
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In an air conditioning system that uses a pilot-operated absolute suction throttling valve, by what means does the valve close as the inlet and outlet pressures equalize. |
Spring Pressure |
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A compressor discharge pressure switch is used to protect against what air-conditioning system problem? |
Low refrigerant |
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The air-conditioning system compressor muffler reduces noise along with what other problem? |
Line vibrations |
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In an air-conditioning system, where is the condenser usually mounted? |
In front of the Evaporator |
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Approx. how much refrigeration oil is contained within each system? |
6-10 ounces |
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In an air-conditioning system, when the compressor produces thumping noise and no cooling, it is an indication of what condiotion? |
Too much refrigerant |
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An abnormally cold spot on a condensor could indicate what cindiotion? |
A partially clogged condensor |
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What action must you take if the receiver/dryer is saturated? |
Replace the reciever/dryer |
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Which of the following is the most widely used refrigerant leak detector in use today? |
Electronic |
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The air conditioning system that is being evacuated must be drawn down to 29 inches and held for how many minutes? |
30-45 |
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What is normally done with excess refrigerant? |
It is pumped into containers and turned into DRMO |
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What is another name for the low side of the compressor? |
Suction Side |
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During the functional testing of an air-conditioning system, what should be the temperature of the air exiting the cooling duct |
40deg. F |
