Wolf FGB-28 - Cleaning the Trap; Checking the Expansion Vessel

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28.7. Cleaning the trap / checking
the expansion vessel
- Remove any residue from the trap
- Place a drip pan under the trap
- Open the cleaning aperture on the trap
- Fill / ush the trap from above through the inspection port in the ue pipe/
bend
Flush only through the ue; do not ll water into the ventilation air
aperture, as this could cause the burner to malfunction.
Check the expansion vessel
If you notice a loss of water, check the expansion vessel pre-charge pressure.
The connection valve is located at the front and is secured with a protective cap.
When the heating circuit is depressurised, the pre-charge pressure should
be about 0.75 bar.
Cleaning the trap
Checking the expansion
vessel