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HVAC BOOK UNITS - 25

Horizontales
A control component that incorporates a system switch, heating thermostat, and cooling thermostat into one housing.
A four-way directional valve that reverses the flow of refrigerant through a heat pump system.
A component that contains a heat exchanger and a fan.
The outdoor temperature at which the output of a heat pump equals the heat loss of a building.
An expansion device that uses pressure and temperature to control the amount of refrigerant entering the coil or evaporator.
A long length of copper tubing that produces a pressure decrease regardless of the direction of refrigerant flow through it.
A device with a relatively warm or cool surface that is capable of absorbing heat from a substance such as air or water.
Verticales
A thermostat that contains more than one mercury bulb switch.
A thermostat that contains several mercury bulb switches that make and break contacts in stages.
A mechanical procedure used to temporarily reverse the refrigerant flow in a heat pump to melt frost or ice on an outdoor unit coil.
A refrigerant line that contains a check valve to allow refrigerant to flow in the opposite direction of an expansion device.
A component that contains a heat exchanger and a blower.
A temporary valve that is attached to and taps into a refrigerant line for service.
A mechanical compression refrigeration system that reverses the flow of refrigerant through a system to move heat from one area to another.