696309

La Nordica LNK15 Manual

39
Zoom out
Zoom in
Previous page
1/128
Next page
ENGLISH
TECHNICAL DESCRIPTION
ADVANTAGES OF DOWNFIRED BOILERS
Combustion in boilers is carried out at high temperatures on the principle of gasication that saves fuel and protects the environment.
The primary and secondary air is heated in the boilers at high temperatures and this ensures a hot and stable ame and constant fuel
quality. All models are equipped with a suction fan and are easily handled and manageable. A large fuel feeder provides the option to
burn logs of wood 500 mm long. All models are equipped with a D.S.A. cooling coil.
DOWNFIRED BOILER OPERATION
Burning wood with a traditional system dened as << direct ame >>, whether this is carried out on a replace, a cooker or a stove, all the
wood that is loaded will burn together since it is covered by the ame that envelopes it and rises from the bottom.
For this reason, it will not be possible to obtain longer fuel duration.
With a down-red boiler, also known as << total gasication boiler >>, fuel is obtained with a completely dierent system, which almost
avoids the entire problem described above.
This boiler is divided into two parts: the upper part (loading chamber) is used to load the wood and its volume is such that it can contain an
amount to ensure operation (maximum continuous power) between 3 and 4 hours.
Combustion air, which is divided into primary and secondary, is fed through a fan connected immediately above the smoke discharge pipe
(SUCTION BOILER), which depressurises the bottom chamber by suctioning the smoke through the slot that opens at the bottom of the said
chamber.
The bottom part contains the actual combustion chamber with the ash collection drawer.
Operation is as follows: load a moderate amount of the wood from the centre door. Wood that is in direct contact with the embers will heat
up immediately and develop fuel gas.
The primary air sucked up by the fan through the opening will lter through the pieces of loaded wood until it reaches the contact point
between the wood and the embers igniting this gas, thus causing partial combustion. This obtains a ame that is partly composed of carbon
monoxide, which, as known, is fuel gas.
When it passes through the nozzle opening that communicates the loading chamber with the bottom chamber, secondary air reaches the
ame (still input by the fan), which completes combustion.
During this phase, the temperature of the ame can increase signicantly and go beyond 1100 °C, thus completely burning all substances, which
would otherwise remain partially burned in a traditional system. Moreover, excess air required will be much more contained (approximately
20 - 30%) compared to more than 100% required in other systems, thus limiting sensible heat dispersion in the smoke.
On the other hand, the upper chamber will hardly have a ame since this is sucked up by the fan and made to pass through the central
opening. The loaded pile of wood is not covered with the ame and it does not catch re like a traditional system.
The wood will only burn when it is in contact with the remaining embers left from previous combustion.
ATTENTION
When the fan is o, the wood left in the boiler still remains in contact with the layer of embers and thus continues gasifying; however, the
gas produced is not burned. Since there is no combustion air, the most volatile part of the gas exits from the ue, whereas the less volatile
part deposits in the loading chamber and the surfaces touched by the ame, thus creating tar scaling that can, in certain cases, obstruct
the smoke passages.
The wood still burns and causes a signicant reduction in the boiler’s overall performance. Also, a large part of the moisture in the smoke
remains condensing inside the boiler, thus generating the onset of corrosion.
For these reasons, the system must be sized correctly to avoid long pause times that would cause signicant problems like the ones mentioned
above.
FOR THESE REASONS, THE BOILER MUST NEVER BE OVERSIZED COMPARED TO ACTUAL SYSTEM REQUIREMENTS
STANDARD COMPONENTS
The boiler is supplied complete with:
• digital display
• power supply cable (plug NOT supplied)
• cleaning set
• assembly and operating instructions
• identication plate
• suction fan complete with smoke ttings
• Puer probe (storage tank technician)
39
… 39 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for La Nordica LNK15 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of La Nordica LNK15 in the language / languages: English, German, French, Italian as an attachment in your email.

The manual is 17,56 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info