COUPLING GP-FLEXIBLE 5055744 - Caterpillar

Complete Charge of the System from a Refrigerant Tank with a Scale
The use of a refrigerant tank and a scale is necessary in order to charge the system. Use the procedure that follows to charge the system.Note: When you charge the system with a liquid, ensure that the engine is not running.
In order to find the refrigerant capacity for the system that needs a refrigerant charge, refer to the Specifications, "System Capacities for Refrigerant" section. Also, refer to the Service Manual, SENR5664, "Identifying the Air Conditioning System" section.
Illustration 1 g00669264
(1) Low pressure valve (2) High pressure valve (3) Charging hose (4) Low pressure hose (5) High pressure hose (6) Manifold gauge set (7) Service valve (discharge) (8) Service valve (suction) (12) Refrigerant tank (13) Valve on top of refrigerant tank (14) Scale (E) Vapor (F) Liquid
Hand tighten charging hose (3) from the manifold gauge set directly to the valve (13) on refrigerant tank (12). Open the valve (13) on top of refrigerant tank (12). This allows the flow of refrigerant through the charging hose (3) to the manifold gauge set (6) .
Loosen the hose (3) at the manifold gauge set (6) for two to three seconds. Then tighten the connection. This procedure will purge the air from the line.
Place the refrigerant tank (12) on the scale (14) so that the valve (13) is at the bottom. Check the weight of the tank.
Open the high pressure valve (2) on the manifold gauge set (6). This action allows the liquid refrigerant to charge the system through the high pressure side of the compressor.
Check the weight of the refrigerant tank (12) often. The weight will decrease as the refrigerant leaves the tank and the refrigerant enters the system. When the required amount of refrigerant (system capacity) has entered the system, close the valve (13) and close the high pressure valve (2). Closing the valves stops the flow of the refrigerant. For example, 1.8 kg (4 lb) of refrigerant has entered a system with 1.8 kg (4 lb) capacity.Note: A heater blanket may be required when you charge an air conditioning system with a partially full refrigerant tank.
In order to ensure correct system operation, disconnect charging hose (3) and conduct a performance check. Refer to the Service Manual, SENR5664, "Performance Checks for the Air Conditioning System" section.Adding Additional Refrigerant to an Air Conditioning System that Has a Low Charge
Failure to properly follow the procedure may cause compressor failure. The procedure that follows is not the preferred method for charging an air conditioning system. The preferred method of measuring the refrigerant is by weight.
Note: The procedure that follows is applicable only if the inlet air temperature at the condenser is between 21 °C (70.0 °F) and 32 °C (90.0 °F). The procedure may be repeated a second time in order to achieve the proper charge with this method.
If the system has no refrigerant, evacuate the system before charging the system. The refrigerant charge should be measured by weight.
Connect the manifold gauge set to the