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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-81. COMPRESSOR CRANKCASE HEATER (CCH).
This task covers:
Inspection
Removal
Adjust
Installation
INITIAL SET-UP:
Tools:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel:1
Equipment Conditions:
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 right front condenser panel (para 4-28).
INSPECTION
1.
Remove two screws (2) and J-box cover (3) (see Figure 4-81).
2.
Check crankcase heater wires in J-box for corrosion or loose electrical connections.
3.
Check for signs of overheating or other visible damage. Replace heater, if defective.
TESTING
The following testing procedure Is performed with power on. Proceed with ex-
treme caution. Death or serious Injury can result.
1.
Connect air conditioner input power and verify CB2 is dosed.
2.
Using a clamp-on ammeter, verify current flow through compressor crankcase heater wires (red) located in J-box
is less than 10 amps.
3.
If no current flow is indicated or current is greater than 10 amps, replace crankcase heater.
REMOVAL
1.
Disconnect air conditioner input power at source.
2.
Tag and disconnect red wire leads.
3.
Loosen two screws (1) and remove flex conduit (4).
Allow crankcase heater to cool before touching crankcase heater. Surfaces are
extremely hot. Serious Injury can result.
4.
Allow heater to cool.
5.
Remove crankcase heater (5).
4-158
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