TM 9-4120-357-14
TABLE 5-2.
NORMAL OPERATING PRESSURES
PRESSURE-TEMPERATURE RELATIONSHIP TABLE
50
75
100
125
AMBIENT-DEGREE F
10
21
38
52
AMBIENT-DEGREE C
90 (32 ) DRY-BULB
F
C
RETURN AIR TO UNIT
Suction line (psig)
58-65
58-70
60-75
75-90
(kg/cm2)
4.08-4.57
4.08-4.92
4.22-5.27
5.27-6.33
Discharge line (psig)
120-160
175-210
255-295
370-410
(kg/cm2)
8.43-11.25
12.3-14.76
17.92-20.74
26.01-28.82
80 (26.7 ) DRY-BULB
F
C
RETURN AIR TO UNIT
Suction line (psig)
58-65
58-70
60-75
65-75
(kg/cm2)
4.08-4.57
4.08-4.92
4.22-5.27
4.57-5.27
Discharge line (psig)
120-155
170-205
250-290
370-410
(kg/cm2)
8.43-10.9
11.95-14.41
17.58-20.39
26.01-28.82
NOTE: Dry-bulb temperatures are measured with an ordinary thermometer.
d. Corrective Action.
(1) If pressures are too low, check for leaks, repair, recharge the system, and repeat the pressure test.
(2) If pressures are too high, close the suction line service valve. Remove the pressure gage and bleed off an
appropriate amount of refrigerant. Repeat the pressure test.
e. Reassembly. Remove the pressure gages, and reassemble the air conditioner as follows:
(1) Close both service valves, and replace caps on gage ports.
(3) Replace front access panel on air conditioner by inserting lower edge of panel behind step in base plate.
Press into position, and secure with four panel fastener screws.
Section IV.
REMOVAL AND INSTALLATION OF MAJOR COMPONENTS AND ASSEMBLIES.
5-14. General.
This section covers the removal and installation of all major components of the air conditioner which require opening the
refrigeration system. The F60T-2 air conditioner's refrigeration system does not incorporate provisions for pumping down
the refrigerant into a receiver for storage; therefore, the refrigerant must be discharged in accordance with paragraph 5-6
whenever the system is opened for replacement of components.
5-15.
Replacement of the Compressor.
a. Access to Compressor. Dismantle the air conditioner to
the extent necessary to
obtain access to
the com-
pressor, in accordance with the following steps:
(1) Unscrew four panel fastener screws from the front access panel. Remove the panel.
(2) Disconnect all wiring harnesses from the junction box, control panel, compressor, and condenser fan mo-
tor.
5-13