ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010 7053-AC
AIR FORCE TO 35E9-136-21
5.31. EXPANSION VALVE (V6) (LIQUID QUENCH). - Continued
ADJUSTMENT
- Continued
The following test must be conducted with power on. Use extreme caution and follow
steps carefully to avoid death or serious injury.
e.
Set temperature control thermostat (S2) to maximum temperature
f.
Connect air conditioner input power at source.
g.
Start air conditioner in COOL mode.
2
h.
Note that suction pressure drops to 58 - 2 psi (4.0 - 0 14 kg/cm ), Allow the compressor to run for at least 20
minutes.
i.
Observe that temperature indicated remains stable for a minimum of 2 minutes, then find saturation
temperature for pressure indicated on gauge, using table 5-1. For example, the saturation temperature for a
2
refrigerant pressure of 69 psig (4.85 kglcm ) is 40 (4.4 )
F
C
j.
Compare saturation temperature with indicated temperature. The indicated temperature should be 20 to 30
(11.2 to 16.8 ) higher than saturation temperature.
F
C
k.
If indicated temperature is not within limits shown above, adjust the quench valve as follows
(1)
Turn adjustment screw (2) clockwise to increase suction line pressure.
(2)
Turn adjustment screw (2) counterclockwise to decrease suction line pressure.
I.
If indicated temperature shown in Step j cannot be stabilized by adjustment, replace quench valve
m.
Turn unit OFF,
n.
Remove thermometer.
o.
Remove service manifold from service valves.
p.
Install service valve protective cap (1)
REMOVAL
a.
Pump down refrigerant system (paragraph 5 19).
Disconnect input power to the air conditioner before performing any internal maintenance
Voltages used can KILL. Shutting the unit off at the control panel does not disconnect unit
power.
5-71
