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ARMY TM 9-4210-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
11.
Start the air conditioner in COOL mode. Note that suction pressure drops to 58± 2 psig (4. 0 ± 0. 14 kg/cm2).
Allow the compressor to run for at least 30 minutes. If the pressure is not within the above limits, ensure proper
operation of the pressure regulator valve (para 5-44) before proceeding with quench valve test.
12.
Observe that thermocouple meter temperature indicated for sensing bulb remains stable for a minimum of two
minutes, then find saturation temperature for pressure indicated on gauge, using Table 5-2. For example, the
saturation temperature for a refrigerant pressure of 69 psig (4. 85 kg/cm2) is 40°F (4.40°C).
13.
Compare the saturation temperature with indicated temperature at the sensing bulb. The indicated temperature
should be 20 to 30°F (-6.7 to -1.1 °C) higher than the saturation temperature. The temperature indicated at
compressor should be 65 to 85°F (18.3 to 29.4°C).
14.
If indicated temperature is not within limits shown in step 11, adjust the quench valve as follows:
a.
Turn adjustment screw (9) clockwise to increase suction line pressure.
b.
Turn adjustment screw (9) counterclockwise to decrease suction line pressure.
15.
If indicated temperature shown in step 11 can not be stabilized by adjustment, replace quench valve.
16.
Tum unit OFF.
17.
Remove both thermocouples.
18.
Remove service manifold from high and low service valves.
19.
Install service valve protective caps.
REMOVAL
1.
Pump down refrigerant system (para 5-21).
WARNING
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.
2.
Disconnect air conditioner input power at source.
3.
Remove locknut (15), screw (19), and two flat washers (16) and (18).
4.
Remove two clamps (17).
5.
Remove two flatwashers (13), screw (11) and nut (14) on sensing bulb retaining clamp (12).
6.
Remove sensing bulb (10) from retaining clamp (12).
NOTE
• If expansion valve body is to be replaced, disassemble before debrazing.
• If expansion valve body is not damaged and will not be removed, proceed to the disassembly
procedure.
7.
Remove expansion valve body (4) by debrazing tubing (3) (para 5-14).
8.
Remove bolt (2) holding valve to bracket (1).
9.
Remove valve (4) from bracket (1).
5-77
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