Bedienungsanleitung Wodtke Frank Airplus S4 (Seite 7 von 83) (Englisch)

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switches the Waterplus appliance off as soon as the set maximum room temperature has been

reached. This will reliably prevent the room of installation from overheating. In this case the

energy needed for the other rooms or for heating drinking water must be generated from

additional heat sources. This is usually achieved by means of a cascade connection with an

electric immersion heater or a oil or gas boiler. Then the auxiliary heat generator only starts up

automatically when the boiler of the Waterplus appliance is switched off. This means that the

base load is still borne by the boiler of the Waterplus appliance, while the other heat generators

only serve to meet demand peaks.

2.3 Minimum operating time / External controller settings

Pellets are a solid fuel which inherently require more time to ignite than do liquid or gaseous

fuels. After the start of ignition it can take a few minutes for the first flame to appear, and a total

of 15 minutes before the preheating programme is completed and the appliance has reached

its full thermal output. In contrast to oil or gas fuelled stoves it can also take a few minutes

after switching off the appliance until all the pellets in the burner pot have burnt down

and the flame goes out. This is why the fan of the appliance has been programmed to

continue running for several minutes after switching off the stove (display shows “G OFF”). You

should therefore wait until this fan after-run time is over before restarting the appliance.

When used with an external controller the appliance should therefore be allowed to run for a

minimum operating time of 30 or better still 60 minutes. This means that the controller must

be set in such a way that the stove’s operating (on-off) cycle does not become too short,

and its hysteresis should be sufficiently large to allow at least 15 minutes to pass from the

“off” to the “restart” signal to accommodate the fan after-run time.

2.4 Heat delivery to water with Waterplus appliances

The heat delivery to water during the operation of Waterplus appliances must be >1.6 kW at

minimum, since otherwise the installed safety devices will make the appliance go into

modulation mode or switch off. Typical signs of insufficient heat delivery to the water heating

system are modulation mode (indicated by “H.M” on the display), frequent switching between on

and off (accompanied by the message “TW OFF” on the display) or an error shutdown triggered

by the temperature cutoff (STB), (indicated by the message “ST”). This shows the importance of

thorough planning to ensure that the appliance is properly connected to the domestic water

system and its control system is properly configurated. The appliance must have a

continuous water throughflow of > 600 l/h, and the circulation pump and the length and flow

resistance of the connecting lines must be dimensioned accordingly. At a flow rate of 600 l/h the

appliance itself has a flow resistance of 130-140 mbar. Insufficient heat delivery to water

points to a problem with the hydraulic system, not with the appliance!

2.5 Room and ambient temperature and humidity during operation

All wodtke appliances are designed only for operation in rooms at normal humidity and at

room temperatures between +5 °C and +25 °C (ambient temperature during operation). At

higher temperatures it can happen that safety devices intervene in the stove’s operation, while

for operation at lower temperatures its settings will need to be adjusted. Please observe the

notes on stove operation concerning this point.

Note: Waterplus appliances require a suitable anti-freeze agent (compatible with solar

energy plants) if they are to be operated at room temperatures <+5°C. wodtke appliances

are generally not splash-proof and must not be installed in wet rooms.

2.6 Connection to chimney

Legal regulations require that pellet stoves be connected to a chimney suitable for solid

fuel fireplaces. The flue gas connector must be made of metal and meet the requirements

of DIN 1298. Your district master chimneysweep will be pleased to advise on this matter. Joint

operation of several appliances via one chimney is admissible, since wodtke stoves fall into

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