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ARMY TM 9-4210-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
5-38.
THERMOSTATIC EXPANSION VALVE (PRIMARY).
This task covers:
Inspection
Adjust
INITIAL SETUP:
Tools:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Thermometer, digital (Item 17, Appendix B)
Thermocouple (Item 18, Appendix B)
Personnel: 1
Material:
Sealant tape (Item 15, Appendix E)
Equipment Conditions:
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.
1.
Disconnect air conditioner input power at source.
2.
Swing open control box assembly (para 4-45).
3.
Remove right front condenser panel (para 4-28).
INSPECTION
1.
Inspect for evidence of leaks, kinked or damaged capillary line, and loose or missing mounting hardware (see
Figure 5-27).
2.
Check thermal bulb to see that it is securely clamped to the suction line.
3.
If a leak is suspected or indicated, test per paragraph 5-15.
ADJUST
NOTE
The expansion valve as supplied with unit is preset at the factory. This valve should not be adjusted
unnecessarily.
1.
Open manual valve (para 5-39).
2.
Open left electric plate (para 4-30).
3.
Install jumper wires to TB2 (para 4-61) for single mode operation (see FO-3).
4.
Attach thermocouple to an exposed surface of suction return line adjacent to sensing bulb.
5.
Connect pressure gauge to expansion service valve port (para 5-30).
6.
Set cool control thermostat (para 4-87) to lowest temperature setting.
5-83
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