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Most of the CFCs refrigerants are not miscible with mineral oils:

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Related questions
Fluorocarbons decompose when exposed directly to ____ temperatures
_____ is the amount of heat required to change the refrigerant from a liquid to a gas
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Latent heat of refrierant is expressed in Btu per second
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During the defrost cycle, the evaporator fan has to run:
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The refrig’erant pressure at the lower side should be as near atmospheric pressure as possible
The compression ratio _______ when the evaporating temperature rises:
On starting the compressor, the evaporator / suction pressure will:
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Ammonia refrigerant has high discharge pressure:
Water is considered a refrigerant. What is its name?
As the superheat increases, the compressor capacity ________:
If the critical pressure of the refrigerant is ______, the power required for compressing the vapor goes up:
Support bracing for 1 1/4" copper tubing shall be at interavals no less than _______ feet.