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  • Technical information

C25ST with modification

Automatic pellet boiler
(Gasification boiler originally on brown coal with modification for pellet burner in the upper door)

  • Rated power 24 kW

  • Boiler efficiency 91,1 %

  • Emission class nr. 5 (Ecodesign)

ATMOS gasification boilers with modification for the burner are a modern solution, where we build an ATMOS A25 / A45 pellet burner into the upper door of a standard gasification boiler.
We will create a tailor-made pellet boiler with automatic fuel ignition.

Advantages of installing a burner in a standard boiler

  • Simple and affordable solution
  • Possibility to heat comfortably with pellets without manual application
  • Large pellet tank 240 – 1000 l / textile storage, part of the boiler room as a tank = refueling once every 7 and 14 days / once a year
  • Convenient and dust-free ash removal with exhaust fan once every 7 to 30 days
  • Automatic ignition of pellets by the ignition spiral at the burner already in the base
  • High efficiency 89 to 92 % depending on the type of fuel and boiler and the set output = great savings on heating costs
  • Ecological combustion – boilers according to EN 303-5:2012 class 5, EKODESIGN 2015/1189
  • Cooling loop against overheating = no risk of damaging the boiler
  • Automatic shutdown of the boiler after the fuel burns out
  • Small size and modern design

Boilers with modification are equipped from the factory with all necessary accessories for easy control of the boiler (burner) according to the customer’s needs and two temperatures (sensors) on the buffer tank TV and TS.

(From serial number 327 700 all boilers are equipped with: 2x AD03 module, toggle switch, boiler temperature sensor TK (KTF 20), TV and TS sensors (2x KTF20 – 5 m), thermostat for pump 70 °C, outlet for pump in boiler circuit.)

The ATMOS A25 pellet burner can be used for all gasification boilers up to 40 kW (except DC50S – 45 kW with ATMOS A45 burner), equipped with an exhaust fan (except models DCxxGD, DCxxGS, DCxxGSX).

We choose the pellet hopper and the type of conveyor according to the size of the boiler room and the heat loss of the building.

The following models are produced in this variant as standard:

Booiler type Power on original fuel – WOOD (kW) Power – PELETS (kW)
DC18S with modification for burner 20 6 – 20
DC22S with modification for burner 22 7 – 24
DC25S with modification for burner 27 7 – 24
DC30SX with modification for burner 30 7 – 24
DC32S with modification for burner 35 7 – 24
DC50S with modification for burner* 49,9 13,5 – 45

*the ATMOS A45 burner is intended for this model

 

Booiler type Power on original fuel – COAL (kW) Power – PELETS (kW)
C15S with modification for burner 16 3 – 12
C18S with modification for burner 20 6 – 20
C25ST with modification for burner 25 7 – 24
C32ST with modification for burner 32 7 – 24
AC25S with modification for burner 26 6 – 20

 

The boilers are designed so that the boiler body is made as a weldment from high-quality steel sheets with a thickness of 3 to 8 mm, which consists of:

  • The upper chamber (6 mm) is equipped with a door with an opening for the installation of a pellet burner.
  • The lower compartment is equipped with a gasification nozzle (DCxxS/SX boilers) or a rotating cast iron grate (CxxS/ST, ACxxS boilers) for easy ash removal. Ceramic fittings support the ideal burning of all combustible substances with high efficiency in environmentally friendly combustion and also serve as an ashtray.

 

Technical information

Specification Boiler type with modification
  DC18S DC22S DC25S DC30SX DC32S DC50S C15S C18S C25ST C32ST AC25S
Boiler output on wood pellets kW 6 – 20 7 – 24 7 – 24 7 – 24 7 – 24 13,5 – 45 3 – 12 6 – 20 7 – 24 7 – 24 4 – 20
Boiler output on original fuel kW 20 22 27 30 35 49 16 20 25 32 25
Prescribed chimney draft Pa/mbar 18/0,18 23/0,23 23/0,23 24/0,24 25/0,25 25/0,25 16/0,16 20/0,20 23/0,23 25/0,25 20/0,20
Boiler weight kg 283 324 326 335 345 433 276 298 379 415 297
Volume of water l 45 58 58 58 80 89 37 45 68 74 45
Hopper capacity dm3 (l) 60 95 95 95 135 180 45 60 90 110 60
Connecting voltage V/Hz 230/50 230/50 230/50 230/50 230/50 230/50 230/50 230/50 230/50 230/50 230/50
Prescribed wood length mm 330 530 530 530 530 730 250 330 330 430 330
Original fuel wood wood wood wood wood wood coal (wood) coal (wood) coal (wood) coal (wood) coal (wood)
Specified fuel (preffered) Quality wood pellets ø 6 – 8 mm (white pellets)
Minimum return water temperature °C 65
Efficiency over the entire performance range % 91,5 91,2 91,2 91,2 91,8 90,4 90,1 91,5 91,1 92,4 91,5
Boiler class 5 5 5 5 5 5 5 5 5 5 5
Energy efficiency class A+ A+ A+ A+ A+ A+ A+ A+ A+ A+ A+
EKODESIGN
The Pellet burner A25 A25 A25 A25 A25 A45 A25 A25 A25 A25 A25

Installation

When installing the burner in 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 at least 20 cm for safety reasons. However, the optimal length of the hose is approx. 40 cm, so that it is possible to easily open the door with the pellet burner when cleaning the combustion chamber.

Recommended connection

The recommended boiler connection is a connection with a Laddomat 22 or a thermoregulation valve and a buffer tank with a capacity of 500 or 1000 l to achieve low fuel consumption and a long burner and boiler life. For further fuel savings (up to 20 %) and the correct function of the buffer tank charging, use the specially developed ATMOS ACD 01 control or the TV and TS sensors, which are designed for the special functions of the ATMOS A25 burner. The ideal burner control is according to two sensors (TV and TS) on the buffer tank. The control unit monitors the heating of the buffer tank completely automatically and always guarantees sufficient energy for the heating system. This type of connection will save you fuel, electricity and increase the life of the pellet burner.

 

From March 1, 2017, boilers modified for the burner are equipped from the factory with two AD03 modules, a toggle switch, a boiler temperature sensor TK (KTF 20), a thermostat for a 70 °C pump and an outlet with a connector for the pump in the boiler circuit.
TK sensor inserted in the boiler sump (from production), TV and TS sensors (boiler accessories from 1. 3. 2019) in the sumps on the storage tank, all connected directly to the burner connector. The modules (2x AD03) are inserted under the instrument hood of the boiler and connected to the boiler terminal board. Both AD03 modules control the boiler exhaust fan and the pump in the boiler circuit.
The 2016 boiler versions contain only one AD02 module for controlling the exhaust fan.

 

 

ATMOS gasification boilers with modification for pellet burner A25 / A45 can be ordered directly from the factory in left or right design. The adjustment is possible only for boilers equipped with an exhaust fan up to 40/50 kW (except type DCxxGS, DCxxGD). If you want to build the burner into an already installed ATMOS boiler, it is possible to order a special kit for its conversion. The set consists of a complete modified door, special wiring and accessories with 23 items.

Boilers with modification (model 2017) are equipped (from boiler serial number 327 700): 2x AD03 module, toggle switch, boiler temperature sensor TK (KTF 20), TV and TS sensors (2x KTF20 – 5 m), thermostat for pump 70 °C, outlet for pump in the boiler circuit.
Boilers with adjustment for pellet burner Model from 2017 are already supplied with two AD03 modules for controlling the boiler and pump exhaust fan in the boiler circuit and two TV and TS sensors for controlling operation according to two temperatures on the buffer tank.

Set for installing a pellet burner in the upper door

  • with right opening – burner A25 – code: S0532 – old design with AD02
  • with left opening – burner A25 – code: S0533 – old design with AD02
  • with right opening – burner A25 – code: S1222 – model 2017-2020
  • with left opening – burner A25 – code: S1223 – model 2017-2020
  • with right opening – burner A45 – code: S0624 – old design with AD02
  • with left opening – burner A45 – code: S0625 – old design with AD02
  • with right opening – burner A45 – code: S1224 – model 2017-2020
  • with left opening – burner A45 – code: S1225 – model 2017-2020

The Pellet burners

Pellet burner ATMOS A25

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

Burner display: used to display the current status of the burner and to set its functions

Burner control: electronic control AC07X, which controls the operation of the external conveyor, two ignition coils and the fan according to the requirements of the boiler and the heating system. The electronics are protected by a boiler safety thermostat, a safety thermostat on the pellet supply to the burner, a fan speed sensor and a photocell for flame sensing. The burner operation is signaled on the electronic control display.

Fuel ignition: automatic by means of two electric ignition coils.

Basic burner functions:
Possibility to use two backup outputs R and R2 for different applications
Possibility of connecting four different sensors TS, TV, TK and TSV
TS – lower sensor on the tank
TV – sensor upper on the tank
TK – boiler sensor or middle sensor on the tank
TSV – flue gas sensor 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

Fuel dosing: special screw conveyors DA1500 – 4000 are designed for this burner.

Pellet burner ATMOS A45

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

Burner display: used to display the current status of the burner and to set its functions

Burner control: electronic control AC07X, which controls the operation of the external conveyor, two ignition coils and the fan according to the requirements of the boiler and the heating system. The electronics are protected by a boiler safety thermostat, a safety thermostat on the pellet supply to the burner, a fan speed sensor and a photocell for flame sensing. The burner operation is signaled on the electronic control display.

Fuel ignition: automatic by means of two electric ignition coils.

Basic burner function:
Possibility to use two backup outputs R and R2 for different applications
Possibility of connecting four different sensors TS, TV, TK and TSV
TS – lower sensor on the tank
TV – sensor upper on the tank
TK – boiler sensor or middle sensor on the tank
TSV – flue gas sensor or solar panel

  • control of the boiler fan from the burner by means of a reserve output (R) (connected from the factory)
  • control of the boiler pump from the burner by means of a reserve output (R2) (connected from the factory)
  • burner control according to two temperatures on the expansion tank

Fuel dosing: special screw conveyors of the DRA type are intended for this burner.