Installation and Usage

1. Model P21X‑0.7W fully‑automatic audible‑alarm exhaust valve for hot‑water boilers must be installed on the upper header and outlet valve pipe in the high‑temperature zone of hot‑water boilers.
2. Fully‑automatic exhaust valves for heating pipelines shall be mounted at the highest point of each respective system.
3. During installation, the valve body shall be horizontal to the pipeline with an installation angle of 90°±2°. A guide tube shall be connected to the exhaust nozzle and threaded sleeve; the other end of the guide tube must be placed at a drainage point or connected to a sewage pipe.
4. The guide tube of the exhaust valve shall be kept horizontal or sloped‑down when connecting to the pipeline to avoid accumulated‑water ejection and personal injury.
5. Two sets of the fully‑automatic audible‑alarm exhaust valves shall be fitted for each hot‑water boiler.
6. When connecting the hot‑water‑boiler exhaust valve to the system, a stop valve shall be installed on the connecting pipe for maintenance convenience. The stop valve shall remain open during operation.
7. For connection between the heating‑pipeline automatic exhaust valve and pipeline, install a stop valve on the connecting pipe for maintenance. Keep the stop valve open while the system is running.
8. The stop valve must be closed during hydrostatic pressure testing of the exhaust valve.

Maintenance Requirements

1. If the exhaust valve leaks or after an operating cycle, close the stop valve. Pour clean water through the exhaust nozzle for repeated flushing to clean the sealing part for normal operation. Unauthorized disassembly of the valve body is prohibited; otherwise after‑sales service will not be provided.
2. Tap gently with a wooden tool before commissioning to ensure the float ball is not stuck.