Manual Dik Geurts Lars 900 (page 25 of 64) (English, German, Dutch, French)

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USER MANUAL

5.1.3 Unsuitable fuel

The materials stated below are not suitable for your fire. Therefore, you should never use:

• Wet or fresh wood,as it contains moist (at least 20%). It will be very hard to ignite your fire with this wood and

it provides little heat.

• Painted, stained or impregnated wood. The chemicals are bad for the environment and will affect the glass

pane and inner lining as well.

• Plywood and chipboard.

• Types of coal such a anthracite, cokes or ovoids. These are only suitable for burning a coal fire.

• Printed (coloured) paper from magazines and newspapers. You can use a ball of paper to ignite the fire.

• Combustible fluids. These may also not be used to ignite the fire.

• Plastic, textile and other waste materials. A ‘multi-burner’ for any material does not exist!

5.2 Ventilation

!Caution

• Observe the applicable national, local and constructional regulations in relation to ventilation and air supply.

• Make sure there is sufficient combustion air.

Combustion requires air. A wood fire will use approximately 35-50 m

of air per hour, an open fire 150-200 m

There are appliances that retrieve the combustion air from the room where the appliance is installed, as well as

appliances that are able to have an outdoor air connection. This is stated in the technical data of the Installation

Manual.

The lack of fresh air in houses with a mechanical air extraction system and/or when a cooker hood is used in an

open kitchen, may create underpressure in your room. As a cooker hood is able to extract 600 to 1000 m

of air per

hour. In those cases, there is a risk that harmful flue gases from the fire flow into the room (smoke blowback).

Moreover, the fire will not work well, if the combustion air has to come from the room where the fire is installed.

In this situation, we recommend placing a fire with outdoor air connection. The combustion air is supplied from

outside, by means of a tube.

In case of an appliance that retrieves its combustion air from the room where it is installed, the supply of fresh air is

very important. You can supply fresh air by opening a skylight or leaving a window/door slightly open.

5.3 Flue duct

!Caution

Always be sure to comply with the applicable national and local building regulations related to flue ducts.

Sufficient chimney draught is a pre-condition for a good and safe operation of the fire. The flue duct must comply

with the applicable national and local building regulations.

When igniting the fire, the flue duct is still cold. This means that there will be little draught. In order to promote

draught, more combustion air is supplied at the beginning. This additional air can be achieved by further opening

the air supply (see section 5.2). It is also possible to slightly open the door. However, the latter only applies in case

of appliances that retrieve air from the room where they are installed. If there is sufficient draught and the fire is

burning well, the primary air supply and the door must be closed again.

In case of excess draught (> 30-40 Pascal), the flue gases are discharged too quickly, which means that there is too

little time to deliver heat. This will affect the efficiency. In order to solve such a problem, it will be better to contact

your supplier.

If possible, we recommend placing a flue valve to control the draught. These are available at your supplier.

By means of this valve, placed in the fire's pipe, you are able to control the draught. When filling the fire, the valve

must be placed in the open position in order to prevent smoke blowback.

!Caution

Do not burn during misty and/or windless weather. Flue gases could drop down which could cause (smoke)

nuisance.

5.4 Ash

When burning wood, ash is generated. After many hours of burning, a lot of ash has been created. The ash will

provide an insulating layer in your fire. As a result, the combustion temperature will increase and the combustion

process will improve. Moreover, an ash layer will protect the fire bottom. This means that you will have to leave the

ash layer where it is. Only when the ash layer reaches the top of the ash threshold, you can scoop half the ash (at

maximum) out of the fire.

!Tip

Make sure there is always at least 2 cm of ash on the fire bottom. This will improve the combustion and protect the

fire bottom.

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Dik Geurts Lars 900 Manual

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