MANIFOLD GP-EXHAUST 2882357 - Caterpillar

Layout of Heating System
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(1) Fresh air filter (2) Control panel (3) Air conditioning unit (4) Sunlight sensor (5) Recirculation sensor (6) Fresh air sensor (7) Recirculation filterHeater Unit
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(5) Recirculation sensor (7) Recirculation filter (9) Servo motor for discharge (10) Servo motor for a/m (11) Water temperature sensor (12) Heater core (13) Servo motor for both recirculation and fresh air (14) Blower linear control (BLC) (15) 5A Fuse (16) Relay (17) Blower motorAir Flow Diagram
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(12) Heater core (17) Blower motor (A) Air outlet for face (upper body) (B) Air outlet for defroster (C) Air outlet for foot (D) Air inlet for recirculated air (E) Air inlet for fresh airSchematic Diagram of Coolant Lines
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(2) Heater unit (12) Heater core (17) Radiator (18) Engine (19) Inside cabThe heating system uses coolant from the engine cooling system. Coolant is always circulated through heater core (12) by the water pump. Dampers on either side of the heater core are actuated when the selected temperature requires heating in order to be attained. The selected temperature is relative to the sensed temperature in the cab. When the dampers open, air flows across heater core (12). The dampers adjust accordingly depending on the amount of warm air that is required to achieve the set point. When the air flows across the heater core, the air is heated very quickly. The heated air is blended with the other air in order to warm the discharged air. The warmed air is then discharged into the cab through the air outlets.The amount of increase in air temperature is controlled by the amount of air that flows across heater core (12). As the amount of air flow increases, the temperature of the air that is discharged increases. The blend of cool air and warm air contains a greater amount of warm air. The coolant continues to flow from the heater core to the engine cooling system.