FLANGE 5088442 - Caterpillar

Illustration 1 g01508209
(1) Low-pressure cutoff switch (2) Receiver-dryer (3) High-pressure relief valve (4) Desiccant
Illustration 2 g01508210
(1) Low-pressure cutoff switch (2) Receiver-dryer (3) High-pressure relief valve (5) Moisture indicatorHigh pressure and high temperature refrigerant leaves the condenser coil and passes through the receiver-dryer (2) . The liquid refrigerant inside the receiver-dryer passes through desiccant (4) . The desiccant absorbs a small amount of moisture. The receiver-dryer stores a small amount of refrigerant. This stored refrigerant is used in order to compensate for the changing system demands. These system demands can result from changing the speeds on the compressor, varying heat loads, or small losses of refrigerant. A high-pressure relief valve (3) is located on most receiver-dryers. The valve allows the refrigerant to be released to the atmosphere if the pressure increases to approximately 3450 kPa (500 psi). Most receiver-dryers also have a low-pressure cutoff switch (1) . If the system pressure lowers to approximately 175 kPa (25 psi), the switch opens. This will open the electric circuit to the magnetic clutch and the compressor will not operate. Some receiver-dryers will have a moisture indicator (5) . This moisture indicator is used in order to determine the relative moisture in the system. If the moisture indicator is blue, the system is dry. If the moisture indicator is pink or white, then the receiver-dryer must be replaced. Refer to Disassembly and Assembly, "Receiver-Dryer Remove and Install" within this manual.