TM 10-6640-238-13 5-37 5-18.    HIGH PRESSURE STEAM BOILER. 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 Teflon Tape, (Appendix E, Section II, Item 157) Personnel Required Two (2) General Safety Instructions 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 High Pressure Steam Boiler.  See Figure 5-14. a. At Main Power Panel, set circuit breaker A1CB19 to OFF. WARNING To prevent injury to personnel, be sure high pressure steam boiler has had time to  cool  before  performing  any  maintenance.    Steam  temperature  as  high  as 600F (279.9C) can be obtained in this unit. b. Remove cover from steam temperature control box (1).  Tag and disconnect wiring and conduit (2) from pyrometer fuse box (3). c. Disconnect two unions (4) at each end of pipe from valve No. 2 to boiler (5) and remove pipe. d. Disconnect union (6) at steam boiler relief valve (7) near top of boiler (5). e. Disconnect inlet union (8) at bottom of boiler (5). f. Remove three screws (9) securing boiler (5) to mount (10) and remove boiler. g. Remove pipe fittings and relief valve (7) from boiler (5).