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i-5

Glossary

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Table of Contents

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Index

low side

— the low pressure side of a system, from

the expansion valve orifice to the compressor inlet

low side service valve

— a valve on the compres-

sor used to service the low pressure side of the

system and permit it to be checked

lubricant

— refrigeration oil specially formulated

to be free of all contaminants and moisture. Note:

different for R-12 and R-134a

magnetic clutch

— an electrically operated de-

vice used to cycle the compressor on and off

manifold

— the part of the manifold gauge device

designed to control refrigerant flow

manifold gauge hoses

— hoses connected to the

manifold gauge set used to test, evacuate, recover

and charge the air conditioning system

manifold gauge set

— a system measuring device

containing two (sometimes three) gauges and three

or more service connections

melting point

— the temperature at which a solid

turns into a liquid

mercury

— used to indicate the amount of vacuum

(a perfect vacuum is 29.92 inches of mercury at sea

level)

molecular sieve

— a drying agent used in the

receiver-drier to absorb moisture and filter con-

taminants out of the refrigerant

natures laws

— the principals of conduct in natu-

ral process or function in nature

PAG

— a polyalkylene glycol lubricant used in

many R-134a systems

parallel flow

— a coil design where refrigerant

flows through both upper and lower tubing at the

same time

phosgene

— a poison gas produced when R-12

comes in contact with an open flame

POA valve

— a suction throttling valve used in

some systems

pressure drop

— pressure lost while passing

through a component, the difference between pres-

sure in and pressure out

pressure range

— a measured spread between a

high and low pressure

pressure switch

— a pressure sensitive electrical

switch mounted at the receiver-drier, on some accu-

mulators or in the suction line to activate or inter-

rupt electrical current cycling the compressor

clutch

propane

— a flammable gas used in the Halide

leak detector

psi

— abbreviation for “pounds per square inch”

psig

— abbreviation for “pounds per square inch

gauge”

purge

— to remove the refrigerant from an AC

system and hoses by opening the system or using

pressure to eliminate the contents

R-12

— the common name of the refrigerant used

in vehicle air conditioner systems to move heat

energy

R-134a

— a new refrigerant which does not harm

the atmosphere

radial compressor

— a compressor that has pis-

tons in a radial design

radiation

— heat waves (heat energy) passing

through the air

radiator shutter

— a metal vane assembly on

some truck radiators where the vanes can be

opened or closed to allow or exclude ram air flow to

the radiator, radiator mounted condenser and en-

gine

ram air

— air through which a vehicle passes,

increasing in force as the speed of the vehicle in-

creases

receiver-drier

— a container which receives,

stores, and removes moisture from refrigerant

reciprocating compressor

— a compressor hav-

ing pistons that move back and forth in cylinders

reclaim

– the process of restoring refrigerant to

new product specifications

recovery

– the process of removing refrigerant

from an AC system