It appears the question is about how to release air, not add air, to a central heating boiler during repressurization. The provided reference discusses removing air while repressurizing, not adding air.
Generally, boilers operate on a sealed system that maintains water pressure; adding air is not part of normal operation. Instead, the process involves releasing trapped air during repressurization to ensure the system works correctly and doesn't suffer damage.
Here’s the process, drawing from the provided reference:
How to Release Air During Boiler Repressurization
Using a Bleed Valve
- Locate the Bleed Valve: This valve is usually found on radiators or other high points in the system.
- Prepare: Place a tissue or cloth around the valve to protect the wall from any dirty water that may be released.
- Open the Valve: Slowly turn the bleed valve anticlockwise.
- Release Air: Keep the valve open and allow air to escape. You will likely hear a hissing sound.
- Water Appears: Once water starts to come out, it means the air has been released from that point.
- Close the Valve: Quickly turn the valve clockwise to close it.
Important Considerations
- Safety: Be careful when handling hot water, as it may be present in the system.
- System Pressure: Monitor your boiler's pressure gauge and only add water when necessary to get it back up to the correct operating pressure.
- Purpose of this procedure: This action ensures the system isn't being blocked by airlocks and allows the water to circulate freely, giving the best heating performance.
- The System is Sealed: Remember, a boiler should operate in a sealed, pressurized system. If the boiler consistently loses pressure or you need to repeatedly bleed radiators, there may be a leak or other issue that requires professional attention.
| Steps | Actions |
|---|---|
| 1. Prepare | Protect the wall with tissue or cloth. |
| 2. Open Valve | Turn the bleed valve anticlockwise. |
| 3. Release Air | Let the air escape until water comes out. |
| 4. Close Valve | Quickly turn the valve clockwise to close it. |
| 5. Monitor | Observe system pressure and address any repeated issues. |
In summary, the referenced material shows how to release air to allow for better performance, not add air into the boiler system.
