4-Way Reversing Valve Positioning
This 4-Way Reversing Valve is connected to the hot- gas line as well as the suction line of the refrigeration system. The connections for the two“permanent”lines, which means the line that is always the hot-gas line and the line that is always the suction line, regardless of the position of the valve, are very easy to identify during installation.
The hot-gas line coming from the compressor is routed to the small port of the 4-Way Reversing Valve. The suction line leading to the compressor is connected to the middle of the three large ports. These two lines between the valve and the compressor always serve the same function. In this regard, you must ensure that the external pressure compensation of an expansion valve is always connected to the permanent suction line, i.e. to the line leading away from the middle large port of the 4-Way Reversing Valve.
If you ignore this rule, excessively high pressure will be applied to the external pressure compensation port, which will not only prevent the expansion valve from operating properly (it will be kept closed with great force), but may even cause permanent damage to the expansion valve. All that’s left now is the two outer large ports. Both of these ports can temporarily be on the high- pressure or the low-pressure side.