Glossary Archives - Page 9 of 11 - Heat Relief Heating & Cooling

Glossary

Crankcase Heater

This is the electric resistance heater installed on compressor crankcases to keep the crankcase oil at a temperature higher than the coldest part of the system to prevent migration. Many newer cooling systems do not require crankcase heaters, however heat pumps do require crankcase heaters. Crankcase heaters are used to overcome the problem of migration

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Compressor

The pump that moves the refrigerant from the indoor evaporator to the outdoor condenser and back to the evaporator again. The compressor is often called "the heart of the system" because it circulates the refrigerant through the loop.

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Charge

Adding refrigerant to a system. Refrigerant is contained in a sealed system or in the sensing bulb to a thermostatic expansion valve.

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CFM

The abbreviation for cubic feet per minute, commonly used to measure the rate of air flow in an air conditioning system.

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Celsius

The metric temperature scale in which water freezes at zero degrees and boils at 100 degrees, designated by the symbol "C". To convert to Fahrenheit, multiply a Celsius temperature by 9, divide by 5 and add 32 (25 x 9 equals 225, divided by 5 equals 45, plus 32 equals 77 degrees Fahrenheit).

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Capacity

The ability of a heating or cooling system to cool or heat a given amount of space. For heating, this is usually expressed in BTU’s. For cooling, it is often given in tons.

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