WD Catalog 2018

Previous Page

Next Page

Page Background

i-7

Glossary

Go to Gl

ossary Start - Table of Co ntents -

Index

thermistor

— a very sensitive electronic tempera-

ture sensor

thermostat

— a temperature sensitive switch

used to control system temperature by cycling the

compressor on and off

thermostat

ic expansion valve — a valve which

senses evap

orator outlet tube temperature and

pressure to

regulate the flow of refrigerant into the

evaporator

TRINARY

™ switch — a three function switch,

the first two

functions protect the compressor from

operating as

follows: 1) abnormally low refrigerant

or loss of ref

rigerant, 2) extremely high head pres-

sure. The

third function can open the radiator

shutter and/

or cycle an air or electric operated fan

clutch whe

n the system requires more air flow

through the

tube and f

in — aluminum or copper tubing in-

serted throu

gh individual pieces of fin material

vacuum

—

expressed in inches of mercury or Hg, a

vacuum is a

state in which air pressure is below

atmospheric

vacuum p

ump — a pump attached to a sealed

system or e

nclosure (an air conditioning system) to

evacuate air

and moisture from the system

valves-in-r

eceiver — a receiver-drier which con-

tains an ex

pansion valve and a POA valve in one

unit

WANKEL

compressor — a type of compressor

which uses

a triangular gear driven rotor inside a

figure eight

shaped cavity to operate and pump

refrigerant t

hrough the AC system

water valv

e — a mechanical, vacuum or air oper-

ated valve u

sed to control the flow of coolant to the

heater core