When removing the gauge port plug from the compressor discharge service valve, what position should the valve be in?

The service valve should be in the backseated position when removing the gauge port plug from the compressor discharge service valve. In the backseated position, the valve is designed to allow for safe and effective pressure measurement without the risk of refrigerant escaping.

When the valve is backseated, it means that it is positioned to isolate the gauge port from the system, preventing the flow of refrigerant. This is essential for accurately taking readings without risking contamination or loss of refrigerant. A backseated valve also minimizes the potential for accidents or injuries by ensuring that the refrigerant pressure is contained within the system while the gauges are being connected or disconnected.

For safety and to avoid possible damage to the system, it is critical to always check that the service valve is properly backseated before performing any maintenance tasks related to the gauges.