pellets boiler - Paul Künzel GmbH & Co.

emoved with a vacuum cleaner from time to time. Do not forget to vacuum inside the ventilator case as
well!
After cleaning, the ventilator needs to be reassembled in reverse order.
Caution: Be aware that during the first run after the cleaning, heavy dust could build up.
If you have any questions or problems concerning your KUENZEL Pellet Boiler, please contact either
your heating installer or your national KUENZEL agent. (See bf www.kuenzel.de).
2 The KUENZEL Thermomix Valve
Abbildung 26: Thermomix Valve Functions Diagram
The KUENZEL Thermomix Valve is an automatic boiler back-end protection which does not require
any other additional energy resources. The return-flow water, which comes out cold from the heating
system, is pre-heated with hot flow-pipe water to a minumum of 63o C. This temperature is above the
dew-point of the exhaust gas in the boiler, so that a build-up of condensation and premature damage of
the boiler through corrosion can be avoided. The benefit of the boiler circulation pump (15) is not only
for the bypass, but also as a loading facility for the buffer storage. The Thermomix Valve can be adjusted
to match a boiler power of up to 50kW.
Connections: In-put R 1 1/2“ , out-put R 1 1/2“˙A swivel-nut must fit the pump connection.
Assembly: We recommend the installation with flat gaskets and stop valves at all three in-put points.
This makes the service and maintenance easier because the whole system does not have to be emptied.
The flaptrap of the Thermomix Valve must be kept shut when the system is being installed. If necessary,
turn the inserted plastic part in the appropriate direction. Please be aware of the direction of the current!
When the valve is being assembled, please use a pair of pliers.
Service: Once a year, the valve must be opened up and cleaned. The expansion cartridge should be
replaced after 5 years as a precautionary measure. If a fault occurs, all movable parts can be taken out
using the lid at the side. This makes the cleaning and also the replacement of parts easier, as it saves
having to take the whole Thermomix Valve out.
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