ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010 7053-AC
AIR FORCE TO 35E9-136-21
5.30 EXPANSION VALVE (V5) PRIMARY). - Continued.
ADJUSTMENT - Continued
g.
Check to be sure temperature in suction line has stabilized and thermocouple meter reading remains unchanged
for at least 2 minutes.
h.
Note pressure on manifold gauge connected to low pressure (suction) service valve. Identify saturation
temperature for pressure gauge reading (see table 5-1) and compare with thermocouple meter reading. The
thermocouple meter temperature should be 8 to 15 (4.48 to 8.4C) higher than saturation temperature found in
F
i.
If the superheat setting is not within limits shown in Step h, adjust expansion valve as follows:
(1)
Remove protective valve cap (2) from side of power assembly (8).
NOTE
Do not change more than two full turns at one time, then wait for 5 to 10 minutes
for temperature to stabilize and recheck pressure and temperature before further
adjustment.
(2)
Turn adjustment stem two complete turns to change superheat setting by 1 (0.56 ). Turn clockwise to
F
C
increase superheat span or counterclockwise to decrease superheat span.
(3)
If superheat cannot be adjusted to units in Step h, replace expansion valve.
j.
When the proper setting is obtained.
(1)
Turn MODE SELECT switch to OFF.
(2)
Install protective seal cap (2).
(3)
Remove thermocouple.
REMOVAL
a.
Pump down refrigerant system (paragraph 5.19).
b.
Disconnect air conditioner input power at source.
c.
Loosen two screws (12) and nuts (1) on sensing bulb retaining clamps (11).
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