A sealed chamber in which water is converted to steam or is heated for circulation in a hydronic heating system

British thermal unit.

A mechanical pump in a refrigeration system that recovers refrigerant vapor and raises its temperature and pressure to the point where it can be condensed for reuse.

Water vapor that liquefies due to the lowering of its temperature to the saturation point.

A heat exchanger in which compressed refrigerant vapor is cooled until it becomes a liquid.

An air cooler that removes moisture from the air.

A switch or box that cuts off electrical power to a machine being serviced.

A pan used to catch and collect evaporator condensate.

A pipe or conduit through which air is delivered.

Energy efficiency ratio; the number of Btu's produced per watt of electrical power consumed by an air conditioner.

The amount of usable energy produced by a machine

Any heating system which the prime energy source is electricity

A tubing coil in which a volatile liquid evaporates and absorbs heat

Any device that removes impurities through a straining process

Any vent or passageway that carries combustion from a boiler or furnace

A system which can be reversed to heat or cool the controlled space

Adds water vapor to the air to increase humidity

A system with all the major components contained in a single cabinet

A small constant flame used to ignite the main gas burner

A grille with adjustable louvers for controlling the direction of discharge air

A type of unit in which the chassis is mounted through the outer wall with the evaporator inside and the condenser outside

An assurance of the product's proper operation and performance

A system designed to maintain varying conditions for various rooms or zones.