Bedienungsanleitung Wodtke Family.nrg (Seite 8 von 68) (Englisch)

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3.7 Cleaning, Maintenance and

Service

In contrast to liquid or gaseous fuels, ash and

soot are always created when using solid fuels.

The combustion quality and operating conven-

ience of wodtke Pellet-Primärofen units are far

higher than the level of comparable cut firewood

furnaces, but cleaning of the burner plate (by

the operator) at regular, short intervals and

service/inspection at longer intervals are nev-

ertheless required in order to free the units of soot

and ash. Without these measures, malfunctions

can occur, for which we can accept no liability.

Regular service, cleaning and maintenance also

increase the efficiency of your system (because

soot in particular is an exceptional insulator and

can therefore significantly reduce thermal output /

efficiency) as well as prevent unnecessary emis-

sions to the environment.

Cleaning interval: daily visual inspection of the

burner pot, with manual cleaning as required.

Maintenance interval: 1,500 kg pellet consumption

(at 0.25% ash content). Please therefore observe

the following chapter and Chapter 11 in these in-

structions.

3.8 Pellet Quality

According to the 1st Federal Immission Control

Act (1st BImSchV), only natural wood pellets are

permitted in Germany.

Pellet quality significantly influences cleaning

and maintenance cycles. We define all of our

specifications and test values based on pellet

qualities with 0.25% ash content, a bulk den-

sity of 650 kg/m³ and a heating value Hu > 4.9

kWh/kg. 500 litres of heating oil thus approxi-

mately correspond to 1,000 kg of such wood pel-

lets. 1,000 kg of these pellets required approx.

1.54 m³ of storage space volume.

Deviations from the values specified above can-

not be avoided, due to the tolerance ranges of

the relevant standards for pellets (incl. ENplus-A1,

DINplus and DIN EN 14961-2 Class A1) for ash

content, bulk density, composition and size/geom-

etry, and necessarily lead to deviations in different

systems. For example, this means that a doubling

of the ash content from 0.25% to 0.5% will also

result in a doubling of the cleaning and mainte-

nance frequency.

The recommended pellet diameter is 6 mm; in case of devia-

tions, the fuel throughput may need to be adjusted. The same also

applies for differing lengths.

For our wodtke Pellet-Primärofen technology, the

ash content of the pellets is therefore the most im-

portant parameter by far.

Consequently, we only approve pellets which

are inspected according to ENplus-A1,

DINplus or DIN EN 14961-2 Class A1 and have

an ash content of < 0.7% for use in our units.

Good commercially available brand-name pellets

consistently have an ash content of << 0.3% to-

day. Ask your pellet supplier about ash con-

tent. The less, the better. The use of approved,

natural binding agents in the pellets can cause

slagging of the pellet ash in the burner pot, despite

inspection according to the standards above. We

therefore recommend avoiding binding agents

containing silicate, such as potato starch, and us-

ing wheat starch, for example. Contact your pellet

supplier in case of questions.

In the case of high bulk density and special ge-

ometry or a high pellet heating value, internal

safety equipment can temporarily reduce unit out-

put until the target values are reached again. This

is not a defect. The unit modulates in this case.

In the case of pellets with extremely low bulk den-

sity or low heating value, the specified nominal

output and performance ranges may be slightly

undershot. This is also not a defect, but instead

due to the nature of pourable and dispensable

fuels.

Using the control system, the specialist company

can adjust the furnace within certain ranges to var-

ious bulk densities and pellet qualities.

Cut firewood or other burnable or waste materials

may never be used!

If the furnace is not operated with approved

fuels, any warranty or guarantee claims are

void and dangerous operating conditions may

result. Do not perform any experiments.

A pellet diameter between 5 and 8 mm is per-

mitted

. The length of the pellets should not ex-

ceed 30 mm. Pellets with high dust content (>5%)

should likewise not be used.

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