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TM 5-4120-361-14
b.
Inspect.
(1) Refer to figure 4-4 and remove
top front cover.
(2) Remove the valve cover and in-
spect coil for cracks, breaks, loose
connections, frayed wires or other de-
fects.
(3) During the cooling cycle, in-
spect the compressor suction line. If
it feels hot, the pressure equalizing
solenoid valve (figure 5-7) is defec-
tive.
(4) Report all defects to direct
supprt maintenance.
c.
Test.
Test the pressure equaliz-
ing solenoid valve for continuity across
electrical leads with a multimeter. If
no continuity is indicated, the valve is
defective and should be replaced. Re-
port all defects to direct support main-
tenance.
4-38.
Expansion Valve (Primary) Inspec-
tion and Test.
a.
General.
If the air conditioning
units is not cooling properly, inspect
and test the expansion valve for de-
fects.
b.
Inspection.
(1) Refer to figure 4-4 and remove
top front cover.
(2) Refer to figure 4-22 and para
5-29c(4) and check that the required
length of the expansion valve’s sensing
bulb is fully in the suction line bulb
well.
(3) Refer to figure 4-22 and exam-
ine the flow restrictor capillary tubes
carefully.
They should be very cold and
evenly frosted.
Unfrosted tubes are
blocked and should be re-placed.
(4) If none of the capillary tubes
is cold and frosted, the valve is
Figure 4-22.
Expansion valve, primary
4-33
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