WD Catalog 2018

Air Conditioner Components

• Refrigerant

• Lubricants

• Compressors

• Compressor Output

• Clutch

• Condensers

• Receiver-Drier

• Accumulator

• Expansion Valves & Other Metering Devices

• Evaporator Coil

• Blower/Fan & Motor Assembly

• AC System Ducts

• AC Hoses and Fittings

• Chapter Review

Refrigerant

The refrigerants we use inAC systems are commonly referred to as R-12 (Freon

12) or R-134a (HFC-134a). They have no color and only a slight odor. They are

non-toxic, non-corrosive and non-flammable chemicals in the form of liquefied

gas. Because the boiling point of a refrigerant is far below 0 degrees Fahren-

heit, it is sold in sealed metal containers so it won’t evaporate.

WARNING

Although refrigerants are safe to use, they can be

dangerous to you and others if you do not use common

sense when you work with them. AC systems operate

under pressures much greater than the truck engine

cooling system. The containers refrigerants are sold

in are also under pressure. At 77 degrees Fahrenheit

outside temperature, the pressure inside the refriger-

ant container is 80 PSI. When released into the air, a

refrigerant boils away and becomes a gas. It’s tem-

perature drops

INSTANTLY

. Please be sure to read

about safety and safe handling of refrigerants in

Chapter 6

. Improper use can cause frostbite and eye

damage. Breathing refrigerant gas can result in res-

piratory problems, especially for people with cardio-

vascular disease.

Chapter

4-1

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