TM 5-6115-593-34NAVFAC P-8-631-34TO-35C2-3-463-2Figure 17-9. Exhaust Fan17-33. For electric generating sets that do not utilizeautomatic starting provisions, manual shutters may beused. A gravity drop shutter may be used for theexhaust duct if the shutters are of light metal. When theset operates, outlet air flow will open the shutter, whichcloses automatically due to gravity when the unit is shutdown. Manual intake shutters operated by a pull chainor pulley device must be opened to provide intake air.The open-closing operation is a manual function.17-34. For electric generating sets utilizing automaticstart functions, the use of motor-operated intake shuttersis recommended. The exhaust shutter may be of thegravity drop type if the shutters are of lightweightmaterial. Motor-operated shutters are held closed byspring tension and are driven to the open position by astall type motor operating through a mechanical linkage.Care should be taken in wiring the system to ensure thatthe intake shutter motor is supplied during all possiblemodes of unit operation; i.e., true power failure,simulated power failure due to incorporation of a systemtest switch, or automatic plant exercising due to theincorporation of a plant exercising timer.17-35. Supplying the intake shutter motor from thegenerator output (before any incorporated line circuitbreaker) will ensure its operation whenever the unitoperates. The shutter motor is usually of thereconnectible type to accommodate either 110/220V ACsupplies. Special application transformers are availableto supply these values if the generator output does notpermit its use directly.17-36. Thermal fusible links are available connected inthe motor circuitry to de-energize the motor and causethe shutter to close in case of fire.17-37. In some cold weather applications, the openingof inlet shutters immediately on the starting may causecarburetor icing, and vaporizing problems. Dieselengines may not operate efficiently if extreme cold air isadmitted through fully open louvers. Thermostaticallycontrolled shutters can be used to counter the difficultiesinherent in cold weather applications.Section VI. COOLING SYSTEM17-38. A properly functioning cooling system isextremely important to any internal combustion enginesince only a fractional part of the heat energy (fuel)supplied to the engine is converted into useful work.The excess heat of combustion is rejected in threeways, by radiation to ambient air and engine oil, etc., viathe engine's exhaust system, and via the engine'scooling system. See table 17-3.17-39. LIQUID COOLING SYSTEM. The engineutilizes a liquid coolant with jackets or chamberssurrounding each cylinder. Coolant water and engineTable 17-3. Generator Set Heat Rejection, RadiatorConnectionsHeat rejection to...................................564,900 BTU/HRroom by enginegeneratorHeat rejection to................................1,368,000 BTU/HRradiator by engine generatorRadiator inlet..................................................... 3 inches(2) size(7.62 cm)Radiator outlet............................................. 3-1/2 inches(8.89 cm)Radiator water............................................ 210 gal./min.flow(13.25 liters/sec.)17-11
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
