The phrase "keying a radiator" likely refers to bleeding a radiator to release trapped air. The process involves using a radiator key to open the bleed valve.
Here's how to bleed a radiator using a radiator key, according to the provided reference:
- Insert the Radiator Key: Insert the radiator key into the bleed screw (also known as the bleed valve).
- Turn Counterclockwise: Turn the key counterclockwise.
- Listen for Hissing: You will hear a hissing sound as air escapes from the radiator.
- Tighten When Done: Once all the air is released (and water starts to come out), tighten the bleed screw by turning the key clockwise.
