SWITCH AS-ROCKER 1992428 - Caterpillar

Personal injury can result from contact with refrigerant.This system is under pressure at all times, even if the engine is not running. Heat should never be applied to a charged system.Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.Always use caution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, evacuate the system recovering the refrigerant before removing the fitting.Personal injury or death can result from inhaling refrigerant through a lit cigarette.Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.Before any checks of the air conditioning and heating system are made, move the machine to a smooth horizontal surface. Lower all implements to the ground. Make sure the transmission is in neutral or park and that the parking brake is engaged. Keep all other personnel away from the machine or where they can be seen.
Use the 138-6629 Refrigerant Identifier in order to verify that the refrigerant that is in the air conditioning system is R-12.
Connect the manifold gauge set to the service ports near the refrigerant compressor. The service ports for charging are located on the refrigerant lines. Connect the low pressure hose to the service port on the suction side of the compressor. Connect the high pressure hose to the service port on the discharge side of the compressor. Make sure that the valved couplings are turned counterclockwise for installation. Then, turn the valved couplings clockwise in order to open the valves.
Turn the pressure valves clockwise and make sure that both pressure valves on the manifold gauge set are closed.
Place a clean rag over the charging hose fitting that is loosened at the manifold gauge set. This will prevent the spraying of compressor oil. Open the low pressure valve on the gauge set about 1/2 turn. Keep the valve open for 2 to 3 seconds in order to flush air from the low pressure hose. This will also flush air from the gauge set. Close the low pressure valve on the gauge set. Repeat this process for the high pressure valve. Tighten the charging hose fitting at the manifold gauge set.Note: Use the refrigerant identifier. The refrigerant identifier will prevent refrigerants that are not R-12 from contaminating the recovery and charging tools.