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TM-4120-375-14
THERMAL EXPANSION VALVE (CONT.)
LOCATION/ITEM
ACTION
REMARKS
ADJUSTMENT
4.
Thermal Expansion Valve
g.
7.
If the superheat setting is not within the limits
shown above (higher than the values in Table 5-3),
adjust the expansion valve as follows:
a.
Remove the hexagonal seal cap from the
side of the power assembly, and loosen
the bonnet seal.
b.
Turn the adjusting stem two complete
turns to change superheat of one degree F.
Turn clockwise to raise, and counterclock-
wise to lower, the superheat setting.
Do not
turn more than two full turns, then wait ten
minutes for temperature to stabilize before
observing temperature and pressure readings.
c.
When the proper setting is obtained, replace
the screw cap and seal on the valve adjusting
stem.
d.
If the expansion valve cannot be adjusted
then stop the air conditioner and replace
the expansion valve.
Remove the thermometer or thermocouple probe from
the suction line, and replace the insulating
material. Close the suction service valve, remove the
gauge, and install the cap on the service valve
port.
5-56
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