SCREEN-VENT 7E0052 - Caterpillar

Illustration 1 g03796298
Typical HVAC layout
(1) HVAC blower motor
(2) Relay
(3) Refrigerant compressor clutch
(4) Water valve rotational actuator
(5) Electronic control module
(6) Refrigerant circuit
(7) Cab temp sensor
(8) Louver temp sensor
(9) Evaporator freeze probe
(10) Control panel
Illustration 2 g03792004
HVAC System components
The main components of the HVAC system are located on the right side of the machine outside of the cab under a hood. The control systems and ducts for the HVAC are located inside the cab. These systems are designed to provide thermal comfort to machine operators in various conditions. Both systems are closed loop systems that work by exchanging heat between the system fluid and the air that is supplied to the operator station. The fluid in the air conditioning system is refrigerant, and the fluid in the heating system is engine coolant. In the air conditioning system, heat is transferred from the hot cab air to the cold refrigerant in the evaporator. The refrigerant is then transported to the condenser. Heat is deposited outside the condenser. In the heating system, heat is transferred from the hot engine coolant to the cold cab air in the heater coil. The engine coolant is then transported to the engine. When the coolant is back in the engine, the coolant is heated again.