kunzel PK 10, Operating Manual, Page: 5 / 36

1 General
1.1 Intended use
This pellet boiler is approved for the operation of an open or closed circuit hot water heating system with
a permissible operating pressure of up to 3 bar and a maximum flow line temperature of 95 ◦ C.
It is not permitted to operate the pellet boiler without a return flow booster. The operation of the return
flow booster is to be monitored. A 4-way mixing valve is sufficient as a return flow booster on systems
with a buffer tank.
The boilers supplied by KÜNZEL are stationary units that comply with the WEEE Directive. The elec-
trical and electronic components contained in the boilers do not fall within the remit of this directive and
will therefore not be taken back by KÜNZEL. Please take these components to the recycling depot.
We do not assume any liability for any malfunctions resulting from the use of non-genuine KÜNZEL
components. This particularly applies to control units, external materials handling equipment and fuel
pipes from other manufacturers. We also do not assume any liability for operational difficulties resulting
from inadequate hydraulic and/or exhaust gas systems. We reserve the right to make technical changes.
1.2 Permissible fuel
It is only permitted to operate this pellet boiler with fuels that comply with the Federal Immission Control
Ordinance (wood pellets manufactured from natural wood).
Permissible pellets have a diameter of 6mm or 8mm. The pellets must comply with the DIN-Plus standard
or the PVA standard (Austrian Pellet Association). The fine fraction (proportion of pellets with a length
of less than 10mm) is not permitted to exceed 8% in the pellet bunker. The powder density must be less
than 0.75kg/dm
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. Other fuels, in particular pellets that contain recycled materials, may not be used.
The specified cleaning interval applies to pellets that comply with the DIN-Plus standard.
For reasons of operational safety and environmental protection the use of fuels other than pellets
that comply with the DIN-Plus or PVA standards is not permissible!
1.3 Safety
•
Installation, service and other work may only be performed by trained specialists in accordance
with the applicable standards.
•
The KÜNZEL pellet burner is equipped with the following safety devices:
– Burnback protection: The spreading of the fire to the rear is prevented by a discharge chute,
a temperature sensor and a fuel supply hose manufactured from special plastic.
– A temperature sensor measures the temperature in the discharge chute and regulates the out-
put as soon as the temperature exceeds the „reduction limit“ . The temperature sensor in the
discharge chute switches the burner off if, despite the output limiter, the temperature in the
discharge chute rises above the „deactivation threshold“ .
– A supply hose manufactured from special plastic, which melts at an elevated ambient temper-
ature (does not burn) and interrupts the connection between the pellet feed mechanism and
the burner. Hoses from other manufacturers may not be employed! No combustible parts
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