Compressor and Motor Assembly

Examine all connections for foreign matter of any

kind. Inspect area thoroughly.

Warning: Avoid bodily contact with the refrig-

erant, especially eye contact. Avoid inhalation of

refrigerant fumes.

c. Removal. Discharge the refrigerant system,

refer to figure 5-23, and remove the compressor.

d. Installation. Instill a replacement compressor

in reverse order of removal, as illustrated in figure

5-23. Pressure test, evacuate and recharge refrig-

erating system (para 5-33).

5-31. Compressor Heater and oil Level

Plug (Bendix-Westinghouse)

a. General. The heater is to prevent refrigerant

sludging. The compressor heater is controlled by

the compressor heater thermostat. It provides

heat to prevent sludging and oil pumping prob-

lems when the compressor is exposed to low am-

bient temperatures. It is a 208 volt, 250 watt re-

sistance heater enclosed within tubing. Oil capac-

ity of the compressor is 31/2 pints FSN 9150823-

c. Cleaning, Inspection, and Repair. Refer to

7905. The compressor comes from the manufac-

paragraph 5-28 and clean and inspect the con-

turer full of oil.

denser coil in a similar manner.

b. Removal and Disassembly. Refer to para-

d. Installation. Replace a defective coil assembly

graph 5-30, and remove the compressor. Refer to

and install in reverse order of removal as illus-

figure 5-24, and disassemble the heater and oil

trated in figure 5-22. Evacuate and recharge re-

plug.

frigerating system (para 5-33).

c. Reassembly and Installation. Replace defec-

tive heater and oil plug and instill in reverse

5-30. Compressor and Motor Assembly

order of removal as illustrated in figure 5-24.

Refer to paragraph 530, and install the com-

a. General. The sole purpose of the compressor

pressor. Evacuate and charge the refrigerant

is to raise the pressure of refrigerant gas from

system (para 5-33) .

evaporator pressure to condensing pressure. The

Note. Proper oil level is even with the bottom of the oil

function of the compressor is to deliver refrig-

plug. Add slowly to bring oil level to normal position. Use

erant to the condenser at a pressure and temper-

oil of specification VVL-825, Type IV, (FSN 9150-823-

ature at which the condensing process can readily

7905),

be accomplished. The motor/compressor is a her-

metically sealed unit and is not repairable in the

5-32. Casing, Base and Duct Assembly

field. An inoperative compressor is usually due to

a. General. The casing and base support pro-

a mechanical failure causing the compressor to

tects the components of the air conditioner. They

freeze, control failure, or a motor burnout. If the

also provide air control around the components of

motor/compressor is mechanically frozen or there

the unit. A duct assembly permits control of the

has been a motor burnout, the compressor must be

source of ventilation air. Baffles provide additional

removed and replaced. When the motor of a her-

automatic air control while the damper is man-

matic compressor fails, high temperatures may

ually adjusted.

develop within the compressor causing a break-

b. Removal. Refer to figure 5-25 and remove the

down of the oil and refrigerant, resulting in for-

casing, base and duct assembly.

mation of acid, moisture, and sludge. All these are

extremely corrosive and must be flushed from the

c. Installation. Install casing, base and dudt as-

system. Repeated burnouts will occur if all of the

sembly in reverse order of removal as illustrated

contiminants are not removed.

in figure 5-25.

b. Cleaning and Inspection. The immediate area

d. Inspection. Inspect the baffle, damper as-

around the compressor mounting should be thor-

sembly and insulator for signs of wear, breaks,

oughly cleaned with a suitable solvent and dried.

cracks or other damage.