REFRIGERATION CYCLE.

TM5-4120-384-14

1-8. REFRIGERATION CYCLE.-Continued

The condenser fan draws outside ambient

air over and

through the two section CONDENSER COIL

(3A) and (3B).

The high temperature high pressure gas

from the

COMPRESSOR (1) is cooled by the flow of

air and is

changed into a high pressure liquid.

The LIQUID SIGHT GLASS (5) indicates the presence of

moisture and quantity of refrigerant in the system.

The DEHYDRATOR, DESICCANT, REFRIGERANT (filter/drier) (6)

removes any moisture (water vapor) or dirt that may be

carried by the liquid refrigerant.

The SOLENOID VALVE (7) is controlled by the TEMPERATURE

This valve will shut off

SELECTOR on the control panel.

the flow of refrigerant to the evaporator section when

the temperature in the conditioned area reaches the set

point.

The EXPANSION VALVE (8) controls the amount and pressure

The

of liquid refrigerant to the EVAPORATOR COIL (10).

EXPANSION VALVE (8) senses the temperature and pressure

of the refrigerant as it leaves the evaporator coil. By

use of the sensing bulb in the BULB WELL (11) and an

"external equalizer line" the valve constantly adjusts

the flow of liquid refrigerant to the EVAPORATOR COIL

(lo).

As the liquid refrigerant leaves the EXPANSION VALVE (8)

it passes through the RESTRICTOR (9) which divides the

refrigerant for the three separate circuits of the

As the high pressure liquid enters

EVAPORATOR COIL (10).

the coil the larger size tubing causes a sudden reduction

This reduction in pressure and the warmer

in pressure.

air being forced across the tubes of the coil cause the

The evaporator

refrigerant to boil or "flash" to a gas.

blower circulates the warm air from the conditioned space

Liquid absorbs

over and through the evaporator coil.

As air from

heat when it changes from a liquid to a gas.

the conditioned spaces comes in contact with the

EVAPORATOR COIL (10), the air is cooled.

To prevent compressor overload and damage during start-

up, SOLENOID VALVE (18) is open at start of cooling cycle

to equalize pressure on both sides of the compressor.

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