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AIR CONDITIONING- L.H. R . H . STEERING . NOTE: A special wrench should be used to adjust the valve to prevent damage to the stem. The stem type service valve has three positions, the of which is explained as follows. A. ON: FULLY ANTICLOCKWISE - Normal operating position, and the position which is used on position. The stem is turned fully anticlockwise. This seals the service gauge MID POSITION - After the service gauge manifold has been installed (the valve stem is in the on position), turn the valve the required number of turns clockwise. This will put the valve stem seat midway in service valve and allow full system operation while permitting refrigerant C. OFF: FULLY CLOCKWISE - With t h e service valve stem turned fully clockwise, the valve will block passage of refrigerant flow through the system. As illustrated, the refrigerant flow to or on whether it is high side or low side) is blocked. WARNING: NEVER operate the air conditioning system with the service valves in the OFF POSITION, it will cause severe damage to the compressor. 3 |