Carrier GR-45 Operation And Service

Contents

Carrier GR-45 Operation And Service Manual pdf 16 page image

1-8T--295COMPRESSORMAIN ENGINERADIATORSUPPLYRETURNHEATVALVEBOOSTPUMPFigure 1-7. Heating Cycle Flow Diagram(GR60 Shown)1.9 HEATING CYCLEHeating circuit (Figure 1-7) components furnished byCarrier Transicold include the integral evaporator coilheater cores and a solenoid operated heat valve.Components furnished by the bus manufacturer includeauxiliary heater and boost water pump. The controllerautomatically controls the heat valve during the heatingand reheat modes to maintain required temperaturesinside the bus. Engine coolant (glycol solution) iscirculated through the heating circuit by the engine andan auxiliary boost water pump. When the heat valvesolenoid is energized, the valve will open to allowengine coolant to flow through the heater coil. The valveis normally closed so that if a failure occurs, the systemwill be able to cool.