TUBE 7N7010 - Caterpillar

Illustration 1 g06047718
Location of HVAC system
Illustration 2 g06058263
(1) HVAC control panel
(2) AC compressor clutch solenoid
(3) High-pressure switch
(4) High/Low pressure switch
(5) Arc suppressor
(6) Water valve actuator
(7) Evaporator temperature sensor
(8) Blower motor
(9) HVAC selector switchThe main components of the HVAC system are on the right side of the machine outside of the cab under a shroud. 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.Refer to UENR4125, "Air Conditioning and Heating R134a for All Caterpillar Machines" for more information on the HVAC system.