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ARMY TM 9-4210-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-60. TRANSFORMER (T1).
This task covers:
Inspection
Testing
Removal
Installation
INITIAL SETUP:
Tools:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel: 1
Material:
Varnish, moisture and fungus resistant (Item 16, 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. Remove center front evaporator panel (para 4-22).
3. Open left electric plate (para 4-30).
INSPECTION
1.
Check for loose, corroded, missing or broken connections.
2.
Check for damaged wires; repair as necessary.
3.
Check transformer (1) for cracks, evidence of overheating, and other visible damage. Replace transformer, if
defective.
TESTING
1.
Using multimeter, check for continuity between black and white input leads. If open, replace transformer.
2.
Using multimeter, check for continuity between R and C output terminals. If open, replace transformer.
3.
Using multimeter set on high OHMS scale, measure resistance between black or white input leads and transformer
case. If resistance is less than 500,000 ohm, replace transformer.
4.
Using multimeter set on high OHMS scale, measure resistance between R or C output terminals and transformer
case. If resistance is less than 500,000 ohms, replace transformer.
5.
Using multimeter set on high OHMS scale, measure resistance between R or C output terminals and black or white
input leads. If resistance is less than 500,000 ohms, replace transformer.
REMOVAL
1.
Tag and disconnect leads (see Figure 4-63).
2.
Remove four screws (2), locknuts (4), and eight flat washers (3).
3.
Remove transformer (1).
4-114
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