Manual Wodtke CW 21 Airplus S4 (page 8 of 83) (English)

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Bedienungsanleitung Steuerung S4_2006_09_25-neu.doc Page 8 / 83

design category 1 according to DIN 18891. The flue draught (chimney draught = negative

pressure) must range between 0 Pa minimum and 20 Pa maximum. A chimney calculation prior

to installation is mandatory (DIN 4705 or EN 13384). The chimney has an important safety

function in the event of a power failure and must be correctly dimensioned so as to ensure that

flue gas is carried off safely from the appliance. In the case of excessive chimney draught we

recommend installing a draught limiter.

2.7 Combustion air supply

wodtke stoves use room air for combustion, and a sufficient supply of combustion air is

therefore essential. The air pressure in the room of installation must not be negative. Please

observe the relevant technical rules / regulations and any additional information provided by

wodtke when operating your appliance in combination with air conditioning systems (for ex.

ventilation systems, exhauster hoods, pneumatic conveyor systems etc.). The use of a type DS

01 wodtke differential pressure switch with accessories (see price list) is mandatory to

ensure safety in the case of combined operation with a ventilation system.

2.8 Pellet quality

All statements on DIN-certified pellet quality in this documentation refer to an ash content of

0.25%, 650 kg/m³ bulk density and a minimum calorific value H

of 4.9 kWh/kg. 1000 kg of

pellets of this specification have an energy content equivalent to 500 litres of heating oil and

require approx. 1.54 m³ of storage space. Please observe the notes on in this in Chapter 11

(Approved fuels). Deviations from these specifications are unavoidable due to the DIN tolerance

ranges allowed for pellets in terms of, for. ex., ash content, bulk density, composition and pellet

size / geometry, and this in turn leads to deviations in other parameters. In the event of high

bulk density, special geometries or high calorific value of pellets it can happen that internal

safety devices temporarily lower the thermal output of the appliance until the desired values (=

nominal thermal output) are complied with again. This is in no way a shortcoming. The

appliance then goes into modulation mode (see Chapters 0 and 0).

2.9 How to increase return flow temperature in Waterplus appliances

Return flow temperature at the water inlet must be at least 50 °C (ideally 55 °C), since

otherwise soot and tar can accumulate. wodtke provides special hydraulic connection pieces for

this purpose.

2.10 Cleaning, care and servicing

Unlike liquid and gaseous fuels solid fuels always leave ash and soot behind as combustion

residues. Although the combustion quality and operating comfort of wodtke appliances are

vastly superior to that of conventional wood fired stoves, this advantage does entail the effort of

regular cleaning and maintenance to keep the appliance clear of soot and ash. Neglect of

cleaning and servicing can result in operating trouble for which the manufacturer cannot be held

liable. Please observe the relevant instructions in Chapters 0 and 9. Regular cleaning, care and

servicing will also help to maintain the efficiency of your stove, since soot is an excellent heat

insulator and can therefore reduce heat dissipation and thermal efficiency considerably.

2.11 Mains voltage / Power supply

230 VAC / 50 Hz. Voltage fluctuations between 195 and 255 V are admissible.

Automatic identification / switchover to 200 VAC / 60 Hz.

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Wodtke CW 21 Airplus S4 Manual

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