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TM 10-6640-215-13 5-13.  REMOVE/INSTALL THERMOSTAT AND HEATING ELEMENT This task covers:   a.  Removal      b.  Installation INITIAL SETUP: Tools Required General Mechanic's Tool Kit.  (Appendix B, Section III Item 2) General Safety Instructions WARNING ELECTRICAL SHOCK Before performing any maintenance actions on electrical equipment ensure all electrical power has been turned off.  Death or serious injury may occur from failure to do this. REMOVAL Remove Thermostat and Heating Element.  See Figure 5-9. a.   On the MAIN POWER PANEL set the water heater circuit breaker (A1CB17) to off position. b.   Turn off the water pump and open water heater drain valve located in cabinet U.  Open hot water faucet to aid in draining. c.   Remove metal screw (1) securing cover panel (2) to water heater. d.   Remove cover panel and plastic thermal protector.  (3). e.   Tag and disconnect two leads on the thermostat (4) and remove thermostat. f.   Tag and disconnect two leads on the heating element (5). g.   Remove four hex head bolts (6) securing bracket (7), O-ring (8), and heating coil (5.). h.   Remove the heating element (5), O-ring (8), and bracket (7). 5-16


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