TM 5-4520-253-13HEAT EXCHANGER PROCEDURES INDEXPAGERemove/Install Heat Exchanger4-67Clean/Inspect/Repair Heat Exchanger4-72REMOVE/lNSTALL HEAT EXCHANGERTOOLS: Tool kit, service, refrigeration unitNSN 5180-00-596-1474MATERIALS/PARTS: Silicone sealant (Item 11, Appendix E)GENERAL SAFETY INSTRUCTIONS:Power off.Heater cool.REMOVAL:Death or serious injury could occur if precautions are nottaken when maintaining this equipment. Position HEATER-OFF-FAN switch to OFF, remove power cable plug fromPOWER RECEPTACLE, and ground capacitors C1 and C2prior to gaining access to heater compartments. Terminalsof capacitors are accessible at end cover of combustionblower. Always have another person standing by who istrained in electric shock first aid.Allow sufficient time for heater to cool to room tempera-ture before gaining access to heater compartments.1. Open access door (1). Locate thermostat mounting bracket (2) and flame switch and bracketassembly (3).2. Remove two screws (4) and lock washers (5) at bracket (2) and lift out thermostat (6).3. Remove two screws (7) and lock washers (8). Lift out flame switch and bracket assembly (3)and thermostat (9).4. Close shutoff valve at fuel container.4-67
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