Table 4-2. Refrigerant Pressures

TM 5-4120-364-13

(3) Check sight glass. If sight glass appears bubblely or frothy, add

refrigerant R-12 as required in accordance with paragraph 4-8 for a clear sight

glass.

(4) Check pressures. Pressure should be as given in table 4-2.

Table 4-2. Refrigerant Pressures

COMPRESSOR

RETURN AIR

AMBIENT

COMPRESSOR

CONDITIONED AIR

DISCHARGE

SUCTION

TEMPERATURE

EXTERNAL STATIC

PRESSURE

(PSIG)

60 2

241 5

125F

90F DB/

0.25 in H20

75F WB

43 2

80F DB/

170 5

95F

0.25 in H20

67F WB

4 - 1 7 . MOTOR COMPRESSOR

General.

( 1 ) Where compressor components are shown in figure 4-11, they are in

n o m a l order of removal from the compressor.

( 2 ) After disassembly, clean all parts with solvent. Use mineral spirits,

w h i t e gasoline or naptha.

( 3 ) Before reassembly, coat all parts with compressor oil and clean and

i n s p e c t all gasket surfaces. Replace all gaskets with new specified gaskets mated

with compressor oil.

( 4 ) After reassembly, evacuate compressor and open suction and discharge

v a l v e s . Restart compressor and adjust refrigerant charge.

(5) Motor Replacement. Startor and rotor are not field replaceable.

S t a t o r is a press fit into motor housing. If compressor motor is damaged, replace

r o t o r compressor assembly.

(6) Pump End Main Bearing. This main bearing is a machined part of the

a l u m i n u m oil pmp and bearing casting. If after disassembly, bearing is scored or

w o r n , replace complete bearing head.

( 7 ) Crankcase and Motor End Main Bearings. These are not field replace-

a b l e . If bearings are worn or damaged, replace rotor compressor assenbly.

4-21