TM 3-4230-218-12&Pb.OperationinFreezing Weather. (Continued)(20) If using the SHOWER mode, adjust the BURNER FUEL VALVE to maintain atemperature of 38 to 42°C (100 to 107%) so that the burnerwill not automatically shut off.(21) Check all hoses and connections for leaks.c.ShutdowninFreezingWeather.If ambient temperature falls below 32% whileand you cannot terminate operations, take theperforming a missionfollowing precautions:Don cold wet weather clothing IAW page 2-40.If clothing (including hand gear) gets wet in cold environments,the operator should immediately change from wet clothing to dryprotective clothing. If this is not done, cold injury will occur.Avoid contact with water as much as possible; stand upwind, if pos-sible, of water spray; use caution when connecting/disconnectingfittings; use caution when adjusting control panel.The equipment should be placed on a level surface with previsionfor water runoff.The operating area for the pump unit must re-main as dry as possible.In cold weather, three operators are needed per system to preventsystem freezeups and operator injury. The third operator willassist the other two operators to ensure the necessary operatingsteps are conducted in a timely manner.Extreme caution should be used when wearing loose clothing to pre-vent contact with moving parts (belts, pulleys, etc).Shutdown under freezing conditions will required the operator andassistants to perform rapidly to prevent equipment freeze-up.Before performing any of the following procedures,prepare at least25 gal. of antifreeze solution by mixing 15 gal. of antifreeze with10 gal. of water.(1) Turn THERMOSTAT SELECTOR switch to OFF position.(2) Turn BURNER FUEL VALVE fully clockwise.(3) Allow outlet water temperature to cool to 40°C.2-42Change 1
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