PIN-SLOTTED 2317260 - Caterpillar

Personal injury can result from contact with refrigerant.This system is under pressure at all times, engine running or not. 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, release it slowly in a well ventilated area.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 either away from the machine or where they can be seen.
If replacement of a component is necessary or repair to a component is necessary, the refrigerant in the system must be recovered. Also, if the system has lost any charge after a long period of time, the refrigerant in the system must be recovered. It is necessary to perform the evacuating procedure to delete the system of all air and moisture. You must run the pump for 90 minutes in order to remove water vapor and you must run the pump in order to attain the vacuum that is listed in Table 1. A complete charge must never be given to a system without first performing the evacuating procedure. Before you evacuate the system, refer to the following topics:
Testing and Adjusting, "Refrigerant Leakage - Test"
Testing and Adjusting, "Refrigerant Recovery"
Testing and Adjusting, "Refrigerant Compressor Oil - Check"If the system has been left open for more than 1/2 hour, the system has been exposed to air and to moisture. Therefore, a new in-line dryer needs to be installed. Moisture will combine with metals in the refrigerant system. This will produce highly corrosive by-products. The by-products are oxides, iron hydroxide and aluminum hydroxide. Moisture can freeze the orifice tube. If there is water in the system, the water must be removed by pulling a vacuum and boiling the water for 90 minutes. Refer to Table 1 that is shown below.
Table 1
Boiling Point of Water Under Vacuum    
Temperature of Work Area (°C (°F))    Vacuum That Is Required In Order To Boil Water In An Air Conditioning System (kPa (in Hg))    
38 (100)    
94.8 (28.0)    
32 (90)    
96.5 (28.5)    
27 (80)    
97.5 (28.8)    
21 (70)    
98.8 (29.2)    
All refrigerant must be recovered before the evacuating procedure is started. Never discharge the