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REFERENCE
HEAT EXCHANGER SYSTEM PRINCIPLES OF OPERATION

TM-3-4230-218-30P Decontaminating Apparatus: Power-Driven Portable Type A/E32U-8 NSN: 4230-01-153-8660 Manual
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TM 3-4230-218-30&P 1-7. GENERAL. a . The  decontaminating  apparatus  has  five  major  systems:  the  engine, air   system, water   system,   heater   system, and    electronic    control    system. These   systems   provide   a   supply   of   pressurized,   temperature-controlled  water. After  the  system  is  operating,  the  operator  is  required  to  periodically  monitor the  output  water  temperature  and  fuel  supplies. b. No  external  power  is  required  to  operate  the  system.  Only  a  source of  water  and  fuel  is  needed. Decontamination  may  be  conducted  in  the  follow- ing  three  ways: (1)  Decontamination  of  material  and  equipment  using  the  cleaning wands. (2)  Decontamination  of  personnel  using  the  showers. (3)  Decontamination  using  the  injector  and  decontaminating  agents. 1-8. ENGINE PRINCIPLES OF OPERATION. a. The engine is a one-cylinder, 2 cycle, air-cooled, power source that develops 7.3 horsepower at 4250 rpm. A centrifugal clutch drives the combustion air fan, the water pump, and the heater fuel pump. The clutch begins to drive the fan, water pump, and fuel pump when the engine speed exceeds 2700 rpm. A diaphragm fuel pump operates on pulsating crankcase pressure to supply fuel to the engine carburetor. b. The engine has a built-in generator. The generator supplies 6 V-ac at 17 watts to power the electronic control system. A manual recoil starter is used to start the engine. 1 - 9.    AIR SYSTEM PRINCIPLES OF OPERATION. The  air  system  consists  of  the  axial  vane  fan  enclosed  in  a  shroud. When  the centrifugal   clutch   engages,    the  fan  assists  in  drawing  air  from  around  the engine   cooling   fins   to   cool   the   engine   and   provide   preheated   air   to   the   heat exchanger. In   the   heat   exchanger,   the   air   is   used   for   combustion   which   in turn  heats  the  water  in  the  heating  coil. 1-10. WATER SYSTEM PRINCIPLES OF OPERATION. The   water   system   consists   of   an   over-capacity,   roller-type   pump   that   is   belt driven   by   the   engine   through   the   centrifugal   clutch. The  pump  can  provide varying  flow  rates  at  the  water  outlet  and  is  controlled  by  a  pressure  regula- tor  valve  on  the  control  panel. The  water  pressure  regulator  valve  will  allow any  over  supply  of  water  to  be  returned  to  the  inlet  side  of  the  pump. 1-3







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