Which seating position is used to add refrigerant through the suction service valve?

Which seating position is used to add refrigerant through the suction service valve?

• A. Back Seated
• B. Front Seated
• C. Mid Seated
• D. None of the Above

Answer: (C)

The important idea is how the valve core sits inside the suction service valve and which path it exposes for flow. When charging through the suction side, you want a position that opens the passage from the service port into the low‑pressure line so refrigerant can enter the system. The middle seating achieves that open path, letting refrigerant flow into the suction side. The other seating positions are intended to seal off or reroute flow, so they’re not used for adding refrigerant. That’s why the mid seated position is the correct choice for charging through the suction service valve.

The important idea is how the valve core sits inside the suction service valve and which path it exposes for flow. When charging through the suction side, you want a position that opens the passage from the service port into the low‑pressure line so refrigerant can enter the system. The middle seating achieves that open path, letting refrigerant flow into the suction side. The other seating positions are intended to seal off or reroute flow, so they’re not used for adding refrigerant. That’s why the mid seated position is the correct choice for charging through the suction service valve.