SPOOL-VALVE 2229316 - Caterpillar

Illustration 1 g01507473
(1) Compressor
(2) Condenser
(3) Receiver-dryer
(4) Desiccant
(5) 90° expansion valve
(6) Block expansion valve
(7) Evaporator
(A) High temperature high pressure refrigerant vapor
(B) High temperature and high pressure refrigerant liquid
(C) Low temperature, low pressure refrigerant liquid vapor mixture
(D) Low temperature low pressure refrigerant vapor The air conditioner refrigerant begins to flow in the air conditioning system at the refrigerant compressor (1). The compressor is designed to change the air conditioner refrigerant from a vapor that has low pressure into a vapor that has high pressure. Also, the compressor changes the refrigerant from a vapor with low temperature to a vapor with high temperature. The increase in pressure causes the increase in temperature. The refrigerant is sent through the condenser coil (2). In the condenser coil, heat is transferred from the refrigerant to the outside air. This changes the refrigerant to a high temperature and high pressure liquid. From the condenser coil, the refrigerant moves to the receiver-dryer (3). In the receiver-dryer, moisture is removed from the refrigerant by the desiccant (4). The refrigerant moves from the receiver-dryer to either the 90° expansion valve (5) or the block expansion valve (6). In the expansion valve, the refrigerant is changed from a high pressure and a high temperature liquid to a low pressure and a low temperature mixture of liquid and vapor. The low pressure and low temperature refrigerant moves to the evaporator coil (7). While the refrigerant is in the evaporator coil, the refrigerant absorbs heat from the cab. This changes the refrigerant to a low pressure and low temperature vapor. The refrigerant returns to the compressor as a low pressure and low temperature vapor. This marks the end of the cycle. The cycle is repeated continuously.