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28.9. Assembling the heat exchanger
- Replace the threaded connection seals
- Tighten the threaded connection on the gas combination valve and check for
leaks.
- Fill the trap from above through the inspection port in the ue pipe/bend.
Fill only through the ue; do not ll water into the ventilation air
aperture, as this could cause the burner to malfunction.
- Carry out test as described in chapter 28.4, Determining the soiling level on
the heating water heat exchanger.
- The measured pressure drop values must lie below the limits.
- If no improvement is apparent, install the "heat exchanger" spare part.
Tighteningthettingonthegas
combination valve
Filling the trap
Control reading
Heat exchanger pressure
differential after cleaning
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