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 TM 55-1905-220-14-9
4-35. THERMAL EXPANSION VALVE - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
d. Make the
cage fit
properly
before
tightening
body
flange.
2. Install bulb
f.
Screws
Install
(1)
REMOVAL/INSTALLATION
3.
Remove valve in accord-
ance with procedure in
NOTE
Be sure to install the thermal expansion valve so that the flow of refrigerant is in
the direction indicated by the arrow on valve body.
ADJUSTMENT
4.
a. The thermal expansion valves are factory set to maintain the suction gas leaving
evaporator at 8to -10 (13.3 to -23.3 ) superheat.
F
C
b. To adjust superheat setting remove seal cap on side of valve and turn adjusting
stem. Turning stem to right decreases refrigerant flow and raises super-heat.
c.
Turning stem to left increases refrigerant flow and lowers superheat. Two turns of
stem will change superheat about 1 (-17.2 ). Adjust two turns at a time.
F
C
d. Adjust each expansion valve separately and wait between adjustments to observe
results. Always tighten any loose connections and replace seal cap after
adjustments.
4-980
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