Low pressure, synthetic chemical refrigerant which is also used as a cleaning fluid

Synthetic chemical refrigerant known as Freon 12/Arcton 12

Synthetic chemical refrigerant

Low temperature application refrigerant

Refrigerant which is azeotropic mixture of R-22 and R152a

Refrigerant which is azeotropic mixture of R-22 and R-115

, AMMONIA Popular refrigerant for industrial refrigerating systems; also a popular absorption system refrigerant

SULPHUR DIOXIDE Low pressure refrigerant used extensively in 1920s and 1930s. Not in use at present; chemical is often used as an industrial bleaching agent

Transfer of heat by heat rays

Pressure or temperature settings of a control; change within limits

Name given the absolute (Fahrenheit) scale. Zero on this scale is 60

A cylinder in a refrigerating system for storing liquid refrigerant and which also holds a quantity of desiccant

Action in which the motion is back and forth in a straight line

Temperature measuring instrument which has a pen marking a moving chart

Substance used in refrigerating mechanism to absorb heat in evaporator coil by change of state from a liquid to a gas, and to release its heat in a condenser as the substance returns from the gaseous state back to a liquid state

Quantity of refrigerant in a system

Device which meters refrigerant and maintains pressure difference between high pressure and low pressure side of mechanical refrigerating system

Ratio of amount of water vapour present in air to greatest amount possible at same temperature

Electrical mechanism which uses small current in control circuit to operate a switch in operating circuit

Safety device designed to open before dangerous pressure is reached. Designed to relieve excess pressure only

The difficulty electrons encounter moving through a conductor or substance

Method of heating evaporator for defrosting purposes by using valves to move hot gas from compressor into evaporator (making evaporator the condenser and vice versa)

Device used to reverse direction of the refrigerant flow depending upon whether heating or cooling is desired

Mechanism which pumps fluid by using rotating motion

Rotating part of a mechanism

Electrical winding of motor which has current flowing through it during normal operation of motor

Disc which bursts at a predetermined pressure. Used in series with a pressure relief valve