pellets boiler - Paul Künzel GmbH & Co.

the PL begins the ignition. The remaining ignition time in minutes appears in the left segment of the
display. The ignition process finishes either at the end of the ignition time or when the control panel, due
to a sudden rise in the exhaust gas temperature, has recognized that the pellets have already been ignited.
The PL now runs at full boiler power until the boiler reaches a temperature 10 K (adjustable between 30
K and 10 K) below the pre–set boiler target temperature. If this happens, then the PL switches itself into
partial load operation automatically. If the boiler temperature drops under the threshold value again, then
the PL switches itself back onto full power again.
The PL remains in operation until the heating electronics demand no more heat from the burner. In the
left segment of the display, the letter „A“appears. If the exhaust gas temperature falls below 90◦ C, the
letter „E“appears in the display. The pellet boiler then passes through an automatic fire pan ash–emptying
cycle. If the heating electronics request heat from the burner again, the PL starts once more.
We recommend the KUENZEL weather–regulated heating electronics for all heating systems, in which
the PL functions as the single source of heat.
1.17.3 Operation with Buffer Storage
The PL can also be operated with buffer storage. We recommend the operation with buffer storage as it
enables a longer running time of the burner, as well if only little heat is demanded. This way emissions
and the general wear and tear can be reduced.
If the buffer storage is integrated into the system, the two buffer sensors have to be joined to the 806 Control
Panel and assessed. The boiler can, as described above, be started. There are two possible operation
modes:
Operation without heating electronics The boiler stays in operation until the boiler temperature exceeds
the boiler target temperature. Now a burn-out begins. As soon as the exhaust gas temperature falls
below 90◦C the buffer temperature will be controlled. If now the upper buffer temperature is higher than
the set switch-over temperature, the boiler circulation pump stops. The upper buffer temperature has to
fall below the switch-over temperature, before the boiler circulation pump starts again. The burner will
stay blocked as well until the upper buffer temperature falls below the switch-over temperature, even if
the boiler temperature falls below 70◦C. Operation with heating electronics If there is a request of the heating electronics on the burner, the
boiler circulation pump is switched on. If the heating electronics’ request stops, the boiler circulation
pump keeps on working until a burn-out starts. If the boiler reaches a temperature 2◦ C (adjustable) above
the lower buffer temperature, the boiler circulation pump stops. The boiler circulation pump starts again,
if the boiler reaches a temperature 2◦C (adjustable) below the upper buffer temperature or if the heating
electronics send a new request.
1.18 Maintenance and Service
As with all technical appliances, your pellet boiler must be regularly checked and serviced. Depending
on the cleaning function, the different cleaning intervals should be kept. An additional thorough service
should be carried out before long periods of disuse such as before the summer holidays.
We recommend that you arrange a service contract with your heating technician.
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