KIT-SEAL 4659255 - Caterpillar

purpose of this service manual is to describe the operation, testing and adjusting procedures, and disassembly and assembly procedures of Caterpillar operator station heating and air conditioning systems. 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.