Unical AIREX 25 2S, Installation And Servicing Manual

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33
Instructions for the installer
4.12 - FAULT FINDING FOR BOILER WITH
STANDARD CONTROL PANEL
WOOD FIRED BOILER:
Problem:
- The fan does not start
Remedy:
- Adjust the working thermostat (pos. 32) to maximum.
- Reset the safety thermostat (pos. 31).
Problem:
- The fan starts, but after 30 minutes it stops;
by switching OFF and ON the main switch (pos. 11) it re-starts.
Remedy:
- Increase the temporized relay’s intervention time
(this has to be done by the After Sales Service or by
authorized trained personnel after switching OFF the
mains supply).
Problem:
- When opening the loading door there are blowbacks
and flue formation.
Remedy :
- Open the door slowly.
- Use wood with a higher moisture content; make sure the boiler
does not remain unused for long periods (see paragraph 6.9).
- Use thicker wood logs.
- Use up all the wood before loading a new batch
Problem:
- The boiler does not reach the requested temperature.
The flame is small and there is too much air.
When the fire box is checked a formation of log bridges is found.
Remedy:
- Check the length of the wood logs (see paragraph 6.6).
- Check how the wood logs are loaded in the fire box (see
paragraph 6.6).
- Cut the logs in two parts (see paragraph 6.6).
- Use smaller logs (round or square, 5 to 7 cm diam. )
- Mix medium-large sized logs (15-20 cm diam.)with small sized
logs (see previous point).
Problem:
- The boiler does not reach the requested temperature. The
flame is too small.
Remedy:
- Check if the by-pass is closed.
- Check the fan
- Check if the doors are properly closed
If you cannot solve the problem, do no attempt
any other inter ventions and
contact an
authorized UNICAL After Sales Service.