Never use a torch or opencause injury to personnelflame to thawand damage toTM 3-4230-218-12&Punit as it can ignite andequipment.If unable to heat antifreeze, allow unit to thaw naturally in a shel-tered area where the temperature is above freezing.After thawing unit, observe water pressure gage for high readings indi-cating contamination of branch hose strainer element by residual icecrystals.f.Thawing Hosesand Accessories. Hoses and accessories should beflushed with warm antifreeze until clean. Be sure branch hose strainer ele-ment is thoroughly rinsed and clear of ice particles.g.OperationinHighScaleDepositEnvironments. If at any time youdetect any particles in, or a slight coating of scales on branch hose strainerelement, you are in a high scale deposit environment. If operations are to becontinually conducted at this site, you must des.tale or remove/replace accord-ing to procedures on page 4-38.(1)(2)In certain environments, you will notice an increase in high scaledeposit build-up on the heater coil.More frequent inspection ofthe heat exchanger must be done to keep equipment in good operatingcondition.The heat exchanger must be inspected at a minimum of100-operating-hour intervals for scale build-up.The descalimg procedures should be completed first, next (B) PMCS,followed by a test to be sure equipment is operating properly afterdescaling.h.OperationinSaltandHighHumidityAreas.(1)(2)Much aluminum is used in the equipment. Aluminum is subject tocorrosion in areas of high salt air.To minimize damage to alumi-num, wash and dry units well after exposure to salt air.Keep the unit clean by moving it inside a protective shed orbuilding when salt or salt air is present. A coat of lubricant canbe used to preserve exposed surfaces on the unit.Change 12-42.5(2-42.6 Blank)
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