TM 10-6640-238-13 4-131 4-54.    WATER LEVEL REGULATOR. This task consists of: a. Remove b. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Lockwashers (2) Teflon Tape, (Appendix E, Section II, Item 157) WARNING ELECTRICAL SHOCK Before performing any maintenance actions on electrical equipment, ensure all electrical power has been turned off.  Failure to comply with this warning may result in serious injury or death. REMOVE Remove Water Level Regulator.  See Figure 4-50. a. Position circuit breaker A1CB17 to off. b. In mechanical room, turn off water pump. c. Open cabinets U and V and drain hot water tank (1) by opening valve (2). d. Open hot water faucet and drain water piping. e. Disconnect two unions (3) before and after water level regulator (4). f. At junction box (5) in cabinet U tag and disconnect regulator electrical leads. g. Disconnect conduit (6) at water level regulator (4). h. Attach a line to electrical leads before drawing leads through conduit (6) to facilitate installation. i. Remove two screws (7), washers (8), lockwashers (9), nuts (10) retaining bracket (11), and water level regulator (4) with electrical leads.  Discard lockwashers. j. Remove two threaded pipe adapters (12) from water level regulator (4). k. Remove cap (13) and tag and disconnect wiring.