Manual Haas-Sohn PINUS II CORNER (page 3 of 10) (English)

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The inner space of the firing chamber is usually lined with fireclay brick shapes. The brick shapes

are not jointed with any filler (the reason is a protection of the bricks against damage by thermic

dilatation). The upper part of the firing chamber is equipped with partitions designed for directing

flue gases into a smoke outlet. The partitions may be fixed or movable. Such movable partition may

serve as a supporting holder for fireclay brick shapes. At the bottom part of the firing chamber, a

simple, fixed cast grate is installed. Before the grate, a barrier is usually provided, to prevent from

burning pieces falling out or onto the door (front glass). Under the grate, there is a space designed

for ashpan. The remaining space at the bottom part of the stove may be used for spare fuel. With

certain models, the smoke flue neck may be adjusted for upper or rear outlet of the smoke: you just

release the clamps and rotate the neck of the smoke flue set in the required direction.

The fireplace insert may be a single- or twin-shell model. The twin-shell type is designed to provide

direct support to the convective stream flowing through the outer construction of the insert body. The

convection holes at the bottom part of the insert allow the air inlet in-between the insert and the

casing. The steel construction of the fireplace insert is protected with special refractory paint.

Caution! Fireplace inserts are not designed for continuous heating but for periodical –

interrupted (i.e. temporary) operation.

2. FIRING PROCESS

2.1. Fuel quantity and firing process adjustments

Burning wood, wood cakes (or coal cakes – optional) in fireplace inserts is based on burning through

the fuel, which means that such firing takes place throughout the whole go of the fuel at a time. In

order to provide optimal conditions for easy kindling and burning up, you need enough air being led

under the fuel in fire, through the grate: this is the so-called primary air, and it must be always

adjustable. By increasing temperature of the fuel burning through, certain gaseous components of

the fuel evolve that – unless additional air is supplied – would be of no avail in terms of heat energy:

therefore, additional air must be provided at the flame level where the firing process connected with

those gaseous components may continue. Now, at this stage, the primary air is – in fact – not

necessary, while secondary air supply is required, or tertiary air may be added as well,

respectively. The secondary air supply, usually adjustable, improves the firing process and

contributes to the door glass self- cleaning. The tertiary air supply is designed for general

improvement of the burning process and is usually fixed (one cannot regulate it anyhow). If the

proportion of the air volumes led into the particular sections of the firing chamber is correct, the

burning efficiency is increased while emission of pollutants in the environment is reduced. The

layout of the air supply regulative elements is shown in the Technical Card (a part of the

documentation supplied with the fireplace insert).

The heating capacity of the heating device depends on the fuel quantity burnt per defined time, fuel

quality and firing process efficiency. The data shown in Chart 2 (heating values) may help you to

make a picture of attainable capacity: let’s assume that you burn 1 kg of wood per hour, wood

moisture is 20%. Further, with higher wood moisture its heating capacity goes down.

In the testing room conditions, adjustability of the heating device was tested, within 30 – 100% of

nominal performance. For the regulation, the chimney effect and the fuel quantity were applied. In

practice, the heating capacity may be regulated by means of air supply regulating elements

(especially the primary air inlet). There is no simple and explicit way to determine the firing process

adjustment by means of regulators. There are many aspects to consider – fuel moisture, type of

fuel, chimney effect, exterior pressure conditions, etc. Therefore, the firing process (the flame

intensity and quality) should be re-adjusted for particular conditions.

You will be able to adjust the firing process to achieve best efficiency after a short time of operation.

A detailed chart showing how to adjust the air supply regulating elements is included in the Technical

Card. The figures in the chart are the testing results verified by the State Testing Laboratory. The

Chart 1 presents just general information for air supply adjustment.

Primary air Secondary air Tertiary air Fuel Fuel quantity

Adjustable Adjustable No adjustment

wooden logs

and eco-cakes

2 - 3 logs (approx. 2 – 3 kg)

2 - 4 logs (approx. 2 – 3 kg)

Open wide

Fixed adjustment

at installation

coal cakes 2 - 3 logs (approx. 2 – 3 kg)

Closed or open

(depends on local

conditions)

half-open

Fixed adjustment

at installation

Chart 1

Our tips for wood burning

• Any time you set the fire, let the primary air regulator open long enough to allow the fuel

burning properly.

• Before you re-load, it is recommended to open the primary air regulator wide.

• While burning wood, make sure the wood is dry, maximum moisture 20%.

Our tips for coal cake burning (selected models only)

• To achieve optimisation of the firing process, load the cakes directly onto the grate holes: this

way, you support the burning in best possible way.

• Make sure you do not overload: for the heat capacity you may use, i.e. to maintain the heat, a

couple of cakes is enough: otherwise the device would suffer from excessive heat. Coal cake

fuel efficiency may reach 6 kWh/1 kg, i.e. by some 40% more than wood!

2.2. Fuel

For fireplaces, you may burn logs, wood cakes and coal cakes (some models only). The moisture of

the wood to be burnt should be lower than 20%, optimally 10%. The rule of thumb is: the less water

in the fuel, the higher heating capacity you achieve. For the recommended wood moisture, you may

reach it safely if you store the wood in a well ventilated shelter for at least two years. The water

content in coal cakes should be specified by the manufacturer. The cakes should be stored in a dry

room otherwise they disintegrate. It is recommended to store the wood intended for burning in pieces

approx. 3-6 cm (diameter), 20–30 cm (length). It is forbidden to load and burn coal or charred

coal. In the fireplace, never burn flammable liquids or waste. It is forbidden to burn papering,

chipboards, plastic materials, penetrated wood, wood shavings or saw dust. Burning such materials

not only is detrimental to the environment but shortens the service life of the heating device as well:

you might seriously damage the device or the chimney as well.

Note: The bark, a part of wooden logs, is no issue at all.

Fuel efficiency : selected types of wood at moisture 20%

Wood Fuel efficiency

kWh/m

Fuel efficiency kWh/1

Weight kg/m

Spruce, fir 1957 4,0 485

Larch 2461 4,0 610

Pine 2280 4,0 565

Oak, beech 2743 3,8 726

Chart 2

3. SAFE OPERATION

3.1. General requirements

While installing and operating stove insert, it is obligatory to adhere to the fire prevention

regulations (related to this type of devices) in force in the country of installation.

The device is designed for standard environment. In case of any temporary change establishing any

temporary danger of fire or explosion (for example, while installing linoleum flooring, PVC, painting,

etc.) it is crucial to put the heating device out of operation IN TIME, BEFORE ANY POTENTIAL

DANGEROUS SITUATION MAY OCCUR. At the end of the work, do not start using the fireplace

again until the room conditions are brought back to normal (it is recommended to provide fresh air by

draught).

5 6

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Haas-Sohn PINUS II CORNER Manual

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