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Page Title:
EVAPORATOR COIL, MALE COUPLING HALF AND EXPANSION VALVE - continued |
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 TM9 4120-423-14&P
ADJUSTMENT
1
The expansion valve, as supplied with the unit, is preset at the factory. This valve should not be
adjusted unnecessarily. When adjustment is necessary, see the following instructions.
2
Remove insulation from a spot on the suction line near the sensing bulb of the thermal expansion
valve to be adjusted.
3
Install an accurate thermometer or the probe of a thermocouple on a bare spot, using a small
amount of the thermal mastic, if available, to improve conductivity. Tape the thermometer bulb
or thermocouple junction in position, and cover with insulating material.
4
Connect LOW SIDE hose of charging manifold to unit LOW SIDE service valve.
5
Check that manifold valves are closed.
6
Loosen the hose connections at the charging manifold slightly.
7
Slightly open the unit LOW SIDE service valve to allow a small amount of Refrigerant R-22 to
purge the hose. Tighten the hose connection at the manifold.
8
Fully open the LOW SIDE service valve.
9
Hold the front cover with radio frequency filter, harnesses, and cables in place in mounted
position on the unit to minimize air leaks.
10
Operate the air conditioner in the cooling mode for about 30 minutes, briefly removing front
panel and observing the thermometer or thermocouple dial to see that the temperature has
stabilized. When the temperature remains unchanged for at least two minutes, record the
temperature and pressure.
11
Compare the recorded temperature and pressure with those in table. The temperature measured
should register approximately 12Ε F (6.7Ε C) higher than the temperature listed on the table.
12
If adjustment is necessary, remove the cap from the expansion valve and turn the adjusting stem
counterclockwise to decrease the superheat and clockwise to increase the superheat. When
adjusting the valve, make no more than one turn of the stem at a time and observe the change in
the superheat closely to prevent overshooting the desired setting. Allow unit to stabilize before
taking reading.
13
When the proper setting is obtained, turn off air conditioner and replace the cap on the valve
adjusting stem.
14
Remove the thermometer or thermocouple probe from the suction line, and replace the insulating
material. Close the LOW SIDE service valve, remove the charging manifold and hose, and
install the cap on the service valve gage port.
0078 00-7
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