Wood Pellet Burner Gasification Boilers

DC18S
DC18S

Gasification boilers with a built-in burner for pellets in the upper doors are an interesting solution intended for all boilers up to an output of 40 kW, equipped with an exhaust fan (except the GS(x) models).
These models are normally produced in this variant:

  • DC18S with adjustment for the burner
  • DC25S with adjustment for the burner
  • DC32S with adjustment for the burner
  • DC24RS with adjustment for the burner 
  • DC30RS with adjustment 
  • C18S with adjustment for the burner
  • C20S with adjustment for the burner
  • AC25S with adjustment for the burner

The burners are constructed in such a way that the body of the boilers is produced as a welded material from quality steel sheets with a thickness of 8 to 3 mm, which consists of:

  • the top chamber (6 mm), which is equipped in the upper section with a door with an opening for mounting the pellet burner and equipped in the bottom section with a gasification nozzle or rotating cast iron grate for easy removal of ash.
  • the bottom space, which is equipped with ceramic pipe fittings for ideal burn-up of all the combustible substances with high efficiency and environmentally-friendly combustion, which as serves as an ash collector.

Benefits of burner built into standard boiler

  • A simple and affordable solution
  • The option of heating comfortably with pellets without manual feeding
  • A large hopper for pellets (500, 1,000 l), textile reserve, part of the boiler as a hopper = addition of fuel once every 7 and 14 days, once per year
  • Comfortable and dust-free ash removal with an exhaust fan once in 7 up to 30 days
  • Automatic ignition of pellets with the ignition filament already built-in the burner
  • High efficiency (83 up to 91%) by fuel and boiler type and set output = high saving of heating costs
  • Environmentally friendly combustion - boiler in accordance with ČSN EN 303-5 class 4, possible grant from the Zelená úsporám programme from the Czech State Environmental Fund
  • Overheating protection cooling loop = no risk of boiler damage
  • Automatic switching off of boiler after fuel burns up
  • Small dimensions and modern design

Atmos A25 burner in upper door
Atmos A25 burner in upper door

Adjustment for pellet burner
Adjustment for pellet burner

Certified Boilers Basic Data

BOILER TYPE
Technical data:
  DC 18S
with adjustment
DC 25S
with adjustment
DC 24RS
with adjustment
DC 30RS
with adjustment
C 18S
with adjustment
C 20 S
with adjustment
AC 25S
with adjustment
DC32S
with adjustment
Wood pellet boiler output kW 6 - 20 7-24 7 - 24 7 - 24 6 - 20 24 4 - 20 7-24
Specified chimney draught Pa 20 23 22 24 22 23 24 25
Boiler weight kg 283 326 331 365 298 351 297 345
Water volume l 45 58 58 65 45 64 45 80
Hopper capacity  dm3 66 100 93 93 66 100 66 140
Connecting voltage  V/Hz 230/50 230/50 230/50 230/50  230/50 230/50t 230/50 230/50
Max wood length  mm 330 530 330 330 330 330 330  
Specified fuel Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets). Quality wood pellets with diameter of 6 to 8 mm (white pellets).
Minimum return water temperature °C 65
Efficiency % 84 - 91
Boiler class pursuant to ČSN EN 303-5   4 4 4 4 4 4 4 4
Subsidised boilers in the Czech Republic            

ATMOS A25/A45 PELLET BURNER

Fuel metering with an external screw conveyor controlled via electronic regulation of the boiler.

  • DA1500 external shaftless conveyors 1.5 m in length, DA2000 2 m in length and a DA2500 conveyor 2.5 m in length are intended for the A25 burner, all with a diameter of 75 mm.
  • DRA50 external shaftless conveyors with lengths of 1.7 m, 2.5 m, 4 m and 5 m with a diameter of 80 mm are intended for the A45 burner.

The fuel hopper top stoking door is modified for installation on an ATMOS A25 burner.

A25
A25 burner

ATMOS A25

The ATMOS A25 burner is designed for burning quality white pellets made of soft bark-less wood with a diameter of 6 to 8 mm, length of 10 to 25 mm and the calorific value of 17 to 19 MJ/kg. Automatic fuel ignition by means of a glowing filament which ignites the pellets whenever heating-up is required, is an advantage of these burners. Thus, the burner and the boiler work at full power with maximum efficiency and the best combustion quality. Unlike a number of competition products that do not have any ignition device and must maintain a glowing layer in the combustion space. Thus, they are operated at low power when the temperature of combustion gases drops below 100°C. Therefore, tar and acids are generated in the combustion space which reduces the service life of the boiler, lowers efficiency, increases fuel consumption, decreases combustion quality, and further fouls the boiler which requires more frequent cleaning.

ATMOS A25 PELLET BURNER

Specified fuel: quality wood pellets (white) with a diameter of 6 to 8 mm, length from 5 to 25 mm and calorific value of 16-19 MJ.kg-1.

Burner display serves for displaying the current state of the burner and for setting its functions

Burner control: electronic regulation AC07X (AC07), which controls the running of the external conveyor, two ignition spirals and the ventilator in accordance with the requirements for the boiler and heating system. Electronics are secured by a safety thermostat of the boiler, a safety thermostat for feeding of pellets into the burner, a sensor of ventilator rotations and a photo cell for recording flames. The running of the boiler is signalised on the electronic regulation display.

Fuel ignition: automatic with the help of two electric ignition spirals.

Basic functions of the boiler:
The option of using two reserve outputs, R and R2 for various applications
Option of connecting four different sensors, TS, TV, TK and TSV
TS - bottom sensor on tank
TV - top sensor on tank
TK - boiler sensor or environment sensor on tank
TSV - sensor of combustion or solar panel

  • Burner control based on two temperatures for the buffer tank
  • boiler ventilator control from the burner with the help of reserve output
  • control of the boiler pump from the burner with the help of reserve output
  • control of the solar power system directly from the burner

External shaftless conveyors DA2000 with a length of 2 m and DA2500 with a length of 2.5 m, all with a diameter of 75 mm, are intended for the A25 burner.

The following conveyors are designed for the ATMOS A25 burner:

  • A screw conveyor for the ATMOS A25 model DA2000 with the length of 2 metres and diameter of 80 mm
  • A screw conveyor for the ATMOS A25 model DA2500 with the length of 2.5 metres and diameter of 80 mm
C18S, AC25S
C18S a AC25S

Burner Standard Boiler Build-In Benefits

  • A simple and affordable solution
  • Comfort possibility of burning large pieces of wood or pellets without manual stoking
  • Easy wood, briquettes, or coal stoking with no smoke removed by an exhaust fan = a clean boiler room
  • Large (500 and 1,000 liter) pellets hopper (boiler room section) = refueling once in 7 and 14 days (once a year)
  • Comfortable and dust-free ash removal with an exhaust fan once in 14 up to 30 days
  • Automatic ignition of pellets with the ignition filament already built-in the burner
  • High efficiency (83 up to 91%) by fuel and boiler type = high saving of heating costs
  • Environmentally-friendly combustion = boiler according to ČSN EN 303-5 Class 3 = subsidized from the "Green to Savings" program of the Czech State Fund for the Environment (SFŽP) (except for C182 and AC25S due to the possibility of coal burning)
  • Overheating protection cooling loop = no risk of boiler damage
  • Automatic boiler turn-off with a combustion gas thermostat after the fuel has burnt out completely
  • Small dimensions and modern design
In case wood, wood briquettes, or coal is used as fuel for heating, the burner should always be removed from the boiler door and the burner opening should be covered with the delivered lid equipped with heat insulation.

Installation

When installing the burner into the upper door of the gasification boiler, it is necessary to use a conveyor with a minimum length of 2 meters so that the length of the hose between the conveyor and the burner is ma inimum of 15 centimeters for safety reasons. However, the optimum hose length is approximately 40 cm so that the door to the pellet burner is easy to open when cleaning the combustion chamber.

Configuration of the boiler, burner, and tankBoiler room

Legend:  1 - Chimney | 2 - Smoke flue | 3 - Boiler | 4 - Burner | 5 - Conveyor | 6 – Hopper

Recommended connection

We recommend a configuration with LADDOMAT 21 or a thermoregulation valve and a compensating tank with a capacity of 500 or 1,000 litres for achieving low fuel consumption and a high service life of the burner and the boiler. Use a specially designed control unit ATMOS ACD01 or the AS25 set, which is used for special functions of the burner ATMOS A25 to further reduce fuel consumption (up to 20 %) and ensure correct operation of feeding the compensation tank.

Connection of the boiler with the A25 burner and the AS25 set

Connection of the boiler with the A25 burner and the AS25 set

Connection of the boiler with the A25 burner and electronic regulation ACD01

Connection of the boiler with the A25 burner and electronic regulation ACD01

The boilers DC18S, DC25S, DC24RS, DC30RS with pallet burner ATMOS A25 are included in the grant project "Zelená úsporám". Therefore, it is possible to order these boilers directly from the manufacturer in the left-hand or right-hand version with the pellets burner built-in modification already available. In case you would wish to install the burner into the standard or other ATMOS boiler, you could order a special set for its rebuilding allowing the installation of the pellet burner into the upper door. The set consists of the complete modified door, special electric wiring, and accessories with 23 items.

Upper door pellet burner build-in set

  • Right-hand opening - code: S0532
  • Left-hand opening - code: S0533
Attention - the pellet burner can only be installed into a gasification boiler equipped with an exhaust fan with an output up to 40 kW.

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