How to exhaust a wall-hung boiler
Wall-hung boilers are common heating equipment in modern homes, and their normal operation is inseparable from correct exhaust operations. Improper exhaust may result in reduced boiler efficiency, increased noise and even equipment damage. This article will introduce in detail the steps, precautions and common problems of wall-hung boiler exhaust to help you easily solve exhaust problems.
1. The importance of wall-hung boiler exhaust
If there is air in the water circuit inside the wall-hung boiler, it will cause the following problems:
| Question type | Specific performance |
|---|---|
| Decreased heating efficiency | The radiator is not hot locally and the water temperature fluctuates greatly. |
| Equipment noise | The sound of water flow and bubbles is obvious |
| Risk of water pump damage | Idling causes bearing wear |
2. Wall-hung boiler exhaust operation steps
The following is the standard exhaust process (taking common gas wall-mounted boilers as an example):
| steps | Operating Instructions | Things to note |
|---|---|---|
| 1. Preparation | Turn off the power and prepare towels and a basin | Make sure the system water temperature is below 40℃ |
| 2. Find the exhaust valve | Usually located on top of the radiator or on the side of the boiler | Refer to the manual to confirm the location |
| 3. Start exhausting | Turn the screwdriver 1/4 turn counterclockwise | It is normal to hear a "hissing" sound |
| 4. Observe drainage | Close the valve after the water flow is stable and bubble-free. | Continuous drainage does not exceed 30 seconds |
| 5. Check the pressure | Replenish water to the range of 1-1.5Bar | The pressure is too low and the operation needs to be repeated. |
3. Exhaust characteristics of wall-hung boilers of different brands
| brand | Exhaust valve position | Special instructions |
|---|---|---|
| power | Right blue knob | Need to cooperate with mode key operation |
| Bosch | Bottom silver knob | With automatic exhaust function |
| Rinnai | Top black nut | Requires special exhaust key |
4. Common problems during the exhaust process
1.Exhaust valve leaking:It may be that the sealing ring is aging and parts need to be replaced.
2.Bubbles persist:Check the system for leaks
3.Pressure cannot be maintained:Possible expansion tank failure
4.No heating after exhaust:Need to check whether the water pump is operating normally
5. Professional maintenance suggestions
It is recommended to exhaust the system before the heating season every year, and pay attention to:
• The floor heating system requires a water distributor to exhaust the air circuit by circuit.
• For composite systems, the radiator should be discharged first and then the floor heating should be discharged.
• It is recommended to install automatic exhaust valves in old residential areas
Through the above systematic exhaust operations, the efficient and stable operation of the wall-hung boiler can be ensured. If you encounter complex problems, it is recommended to contact the manufacturer’s after-sales personnel for professional maintenance.
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