Jotul F3 TD: 5.0 Use

16

ENGLISH

4.5

 Chimneys and flue pipes

•  The fireplace can be connected to a chimney and flue 

pipe approved for solid fuel fired appliances with flue gas 

temperatures specified in 

«2.0 Technical data»

. 

•  The chimney’s cross-section must be at least as big as the 

flue pipe’s cross-section. See 

«2.0 Technical data» 

when 

calculating the correct chimney cross-section. 

•  Several solid fuel fired appliances can be connected to the 

same chimney if the chimney’s cross-section is sufficient. 

• 

Connection to the chimney must be carried out in accordance 

with the installation instructions from the supplier of the 

chimney. 

•  Before making a hole in the chimney the fireplace should be 

test-mounted in order to correctly mark the position of the 

fireplace and the hole in the chimney.  See 

fig. 1

 for minimum 

dimensions. 

•  Ensure that the flue pipe is inclined all the way up to the 

chimney.

•  Use a flue pipe bend with a sweeping hatch that allows it to 

be swept.

Be aware of the fact that it is particularly important that 

connections have a certain flexibility in order to prevent 

movement in the installation leading to cracks.

N.B. A correct and sealed connection is very important for the 

proper functioning of the product.

The chimney draught should never exceed 2.5 mm H

2

O (25 Pa) 

when the fireplace is in use. If the draught is too strong you can 

install and operate a flue damper to control the draught.

In case of chimney fire: 

•  Close all hatches and vents.

•  Keep the firebox door closed.

•  Check the loft and cellar for smoke.

•  Call the fire service.

•  Before use after a fire an expert must check the installation 

in order to ensure that it is fully functional.

4.6

 Control of functions (fig. 2)

When the product is set up, always check the control functions. 

These shall move easily and function satisfactorily.

Jøtul F 

3

 TD is equipped with the following controls:

Ash door vent control.  

(Fig. 2A)

Air vent control.  

(Fig. 2B)

5.0  Use

5.1

 Choice of fuel

Always use quality firewood

.

 This will give you optimal results, 

any other fuel may damage the fireplace. 

5.2

 Jøtul’s definition of quality firewood 

By quality firewood we mean logs of, for example, birch, beech, 

and pine.

Quality firewood should be dried so that the water content is 

maximum 20%.

To achieve this the wood should be chopped at the latest in late 

winter or early spring. It should be cut and stacked so that air 

circulates around it. The stacks should be covered on top so as 

to avoid absorbing excessive rainwater. The logs should be taken 

indoors in autumn for use during the winter season.

The amount of energy obtainable from of 1 kg of quality firewood 

varies very little. On the other hand the specific weight of the 

different kinds of wood varies considerably. As an example, a 

certain volume of birch will provide less energy (kWh) than the 

same volume of oak, which has a higher specific weight.

The amount of energy produced by 1 kg quality firewood is 

about 3.8 kWh. 1 kg of completely dry firewood (0% humidity) 

produces about 5 kWh, while firewood with a humidity level of 

60% produces only around 1.5 kWh/kg.

Consequences of using damp wood may include:

•  Appearance of soot/tar on the glass, in the fireplace and in 

the chimney.

•  The fireplace emits little warmth.

• 

Risk of chimney fire as a consequence of accumulation of soot 

in the fireplace, flue pipe and chimney.

•  The fire may die out.

Be especially careful never to lay a fire using any of the following 

materials:

•  Household waste, plastic bags, etc.

•  Painted or impregnated wood (highly toxic)

•  Chipboard or laminated boards

• Driftwood

This may harm the product and pollute the atmosphere.

N.B. Never use combustible liquids such as petrol, kerosene, red 

spirit or similar to start the fire. This may cause harm to both 

yourself and the product.

5.3 Log length and amount

The maximum length of logs to be used is 

40 cm

. Jøtul F 

3

 TD

has a nominal heat output of 

6,5

 kW.   This is equivalent to a 

consumption of approximately  

2,1

 kg of quality firewood 

per 

hour

.

17

An important factor for proper fuel consumption is that the logs 

are the correct size. The size of the logs should be:

Kindling:

Length: 30 - 40 cm

Diameter: 2-5 cm

Amount per fire: 6-8 pieces

Firewood (split logs):

Length: 40 cm

Diameter: Approx. 8 cm

Intervals for adding wood: Approximately every 45 - 50 minutes

Size of the fire:  1,7 kg 

Amount per load:  2 pieces

5.4

 First time use 

Before lighting the stove, put a layer of sand/ash in the bottom 

to protect the bottom plate. The sand or ash should cover the 

top of the ridges. 

•  Light the fire as described under 

«5.5 Daily use»

.

•  Light the fire for a couple of hours and ventilate any smoke 

and smell from the product.

•  Repeat this a couple of times.

N.B. Odours when using the fireplace for the first time.

Painted products:

the fireplace may emit an irritating gas when 

used for the first time, and it may smell a little. The gas is not toxic, 

but the room should be thoroughly ventilated. Let the fire burn 

with a high draught until all traces of the gas have disappeared 

and no smoke or smells can be detected.

Enamelled products:

 Condensation may form on the surface of 

the fireplace the first few times it is used. This must be wiped off 

to prevent permanent stains forming when the surface heats up.

5.5 Daily use

The product is intended for intermittent combustion. By 

intermittent combustion one means normal use of a fireplace, 

meaning that each fire should burn down to embers before new 

firewood is added. 

• 

Open both air vents 

(fig. 2A and 2B)

. (Use a glove, for example, 

as the handle can become hot.) 

•  Place two medium sized logs in/out on each side of the 

base. 

• 

Crumple some newspaper (or birch bark) between these and 

add some kindling wood in a criss-cross pattern on top and 

light the newspaper. Gradually increase the size of the wood. 

•  Leave the door slightly open until the logs catch fire. Close 

the door and ignition vent when the firewood has ignited 

and the fire is burning well. 

•  Then regulate the rate of combustion to the desired level of 

heating by adjusting the air vent 

(Fig.  2B)

.

Nominal heat emission is achieved when the air vent is open 

approximately 40% and the ignition vent closed.

5.6 Adding firewood

1.  Each fire should burn down to embers before new firewood 

is reloaded. Open the door slightly and allow the negative 

pressure to level out prior to opening the door completely.

2.  Add the wood and make sure that the air vent is fully open 

for a few minutes until the wood has caught fire. 

3.  The air vent 

(fig. 2B)

 can be turned down once the wood has 

properly ignited and is burning well. 

N.B. Danger of overheating: the fireplace must never be used in 

a manner that causes overheating.

Overheating occurs when there is too much wood and/or air so 

that too much heat is developed.  A sure sign of overheating is 

when parts of the fireplace glow red. When this happens, reduce 

the ventilation opening immediately. 

Upon suspicion of excessive/poor draught in the chimney, seek 

professional help. See also 

«2.0 Technical data»

 and 

«4.5 Chimney 

and flue pipe»

 for information.

5.7 Using fireplace during the transition 

from winter to spring

During a transitional period with sudden fluctuations in 

temperature, negative smoke draught or under difficult wind 

conditions, disturbances in the chimney draught may occur so 

that the smoke gasses are not drawn out.  

One should then use less firewood and have a larger opening in 

the air vents so that the wood burns fresher and faster.  In this 

was the draught in the chimney will be maintained. 

To avoid accumulated ash, it should be removed more often than 

usual. See 

«6.2 Ash removal»

.

ENGLISH