PRINCIPLES OF OPERATION - TM-10-3930-673-340542

TM 10-3930-673-34

15-2. PRINCIPLES OF OPERATION (CONT)

b. Compressor. The compressor draws

vaporized refrigerant from the evaporator coil and

compresses the vapor to a high pressure, that is

necessary for condensation. The high pressure

vapor then moves into the condenser coil where

heat can be radiated to change the refrigerant back

to liquid. The compressor is equipped with an

electrically actuated clutch to engage or disengage

drive to the compressor.

The compressor V-belt pulley is mounted on a

bearing and is free to rotate without turning the

compressor crankshaft anytime electrical power is

disconnected. The field coil on the compressor is

energized by electrical current from either the

thermostat, high pressure switch, or low pressure

switch. Energizing the field coil creates a magnetic

force that locks the driven disk to the pulley and

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drives the compressor.

c. Condenser Coil. The purpose of the

condenser coil is to radiate enough heat energy from

the compressed high pressure vaporized refrigerant

so that the refrigerant changes from a vapor to a

liquid. This is done with cooling fins on the

condenser coil and the engine cooling fan.

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15-2