FITTING 0983899 - Caterpillar

Illustration 1 g00654556
(1) Inlet hose with air conditioner quick disconnects (2) Outlet hose with air conditioner quick disconnectsThe accumulator and an in-line dryer with an orifice tube are important components in an expansion valve system.The orifice tube assembly is located at the outlet end of the in-line dryer. The dryer is located in-line between the condenser coil and the evaporator coil. Inside the in-line dryer, liquid refrigerant passes through a filter and a desiccant which absorbs a small amount of moisture. The orifice tube assembly then changes the liquid refrigerant of high temperature and high pressure to a liquid of low temperature and low pressure. The orifice tube provides a metered restriction which causes this change to occur. However, control of the flow rate is determined by pressure differences across the orifice and by subcooling.A moisture indicator is no longer a part of replacement in-line dryers. The moisture indicator was used previously to determine the relative moisture in the air conditioning system. In order to properly check for moisture with a moisture indicator, the air conditioning system must be in operation for two to three hours. Look at moisture indicator. If the indicator is blue, the system is dry. If the indicator is pink, the system contains moisture. This moisture must be removed.Note: Replace any in-line dryer yearly. Also, if the moisture indicator is pink replace the in-line dryer. The dryer is designed to be replaced without recovering the system by the use of quick disconnects.Reference: Refer to Operation and Maintenance Manual, "In-Line Refrigerant Dryer - Check/Replace" for proper replacement procedures.