TM 9-4120-402-14
4-41. HEATER RELAY (K1) AND DIODE (CR2).
This task covers:
a. Remove
b. Inspect
c. Test
d. Install
INITIAL SETUP
Tools
Equipment Conditions:
Refrigeration Unit Service Tool Kit
Appendix B, item 1
CAUTION
Power Supply
Use disconnect switch (NOT POWER
Appendix B, item 6
CABLE) to disconnect power to unit.
Damage to cable connector pins will
Heat Gun
result if cable is used.
Appendix B, item 4
Disconnect power at power source.
Crimping Tool Kit
Appendix B, item 2
Remove control assembly (para 4-34).
Materials/Parts
Remove logic box assembly (para 4-36).
Heater Relay
Remove motor controller assembly (para 4-37).
Lock Washers (7)
Lug Terminals (2)
Insulation Sleeving
(Heat-Shrink Tubing)
a. Remove.
(1) Tag and disconnect wire leads from ground E3.
(2) Remove three sets of screws (1), lock washers (2), and flat washers (3). Carefully pull relay bracket
(4) and relays from control assembly as far as wire leads will allow.
NOTE
Terminal protective cover must be removed to access wire terminals.
(3) Tag and disconnect wire leads and diode assembly from relay (5).
(4) Remove four sets of screws (6), lock washers (7), flat washers (8), and relay (5).
b. Inspect.
Check general condition of relay and diode and that terminals are not broken or missing. Replace if
damaged.
4-121
