Manitou MLT 634 Service Manual (11 pages)

The MANITOU air-conditioning unit is based on the coolant's ability to absorb heat in considerable
quantities when it is subjected to physical changes on being transformed from a liquid state to a gas.
Operating cycle (see diagram) :
The gas coolant, at low temperature and pressure, is sucked in by the compressor which is driven by the
vehicle engine.
The compressor expulses the coolant, still as a gas, at high pressure and temperature, and it goes into the
condenser in this state.
Inside the condenser, the fluid undergoes a physical transformation from a gas to a liquid state, giving off
heat in the process. The warm air which passes through the condenser is evacuated by a dynamic effect
produced by the engine cooling fans. The liquid coolant leaving the condenser crosses the dehumidifying
filter which removes the humidity and solid impurities, then goes on to the expansion valve.
When the liquid is vaporized in the expansion valve, the pressure falls and lowers the temperature in the
evaporator. During its travel through the evaporator, the coolant is physically transformed from a liquid to
a gaseous state and then sent to the compressor. The air which flows over the cold surfaces of the
evaporator is cooled in turn, lowering the temperature in the cab.
This air, which is circulated by an electric blower system is dehumidified because the vapour in the air, is
condensed following contact with the cold walls of the evaporator. This condensation water is collected in
a drainage trap and evacuated outside the machine

DETAILS
Size: 37.7MB
Format: PDF
Brand: Manitou
Number of pages11
Type of document: Workshop manual

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