TM 5-4520-253-13
l N S P E C T / T E S T / R E M O V E / l N S T A L L H E A T E R - O F F - F A N S W I T CH
TEST EQUIPMENT: Volt ohmmeter
TOOLS: Tool kit, service, refrigeration unit
NSN 5180-00-596-1474
Solder gun kit
NSN 3439-00-930-1638
MATERIALS/PARTS: Solder (Item 12, Appendix E)
GENERAL SAFETY INSTRUCTIONS:
Power off.
INSPECTION:
1. Operate HEATER-OFF-FAN switch.
Be sure switch snaps firmly into all operating positions.
Death or serious injury could occur if precautions are not
taken when maintaining this equipment. Position HEATER-
OFF-FAN switch to OFF, remove power cable plug from
POWER RECEPTACLE, and ground capacitors C1 and C2
at end cover of combustion blower.
Always have another
person standing by who is trained in electric shock first aid.
2. Open control box and examine for damage to switch body or terminals. Replace defective
switch.
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