Before installing a manifold gauge set on a refrigeration unit make sure:

Question

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Before installing a manifold gauge set on a refrigeration unit, it is important to ensure that the service valves are back-seated. This is because back-seating the valves makes sure that the high and low pressure sides of the refrigeration system are isolated from each other, which prevents leaks and other potentially dangerous situations. Mid-seating or front-seating the valves could cause refrigerant to leak out or allow air into the system, which could damage the unit or create a hazardous situation for the technician.

Before Installing a Manifold Gauge Set on a Refrigeration Unit