When charging refrigerant on the low side of a reciprocating machine, what is the correct position of the manifold gauge?

When charging refrigerant on the low side of a reciprocating machine, having the high side front seated and the low side back seated is crucial for several reasons. Front seating the high side valve ensures that the high-pressure side of the system is completely closed off while allowing for the safe monitoring of conditions on that side without introducing refrigerant. By back seating the low side valve, you can control the flow of refrigerant effectively into the system, preventing any unwanted backflow from the low side.

This configuration allows for the proper introduction of refrigerant into the low side without risking overpressure conditions on the high side or inadvertent mixing of pressures. Maintaining the correct positions of the manifold and valves is essential for safe and effective charging, ensuring that the refrigerant enters the system in a controlled manner, which optimizes the performance and efficiency of the machine.