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  • Automatic wood ignition
  • Technical details
  • High performance boilers

DC25S

Gasification boiler for wood

  • Rated power 27 kW

  • Boiler efficiency 89,9 %

  • Emission class nr. 5 (Ecodesign)

  • Log lenght 530 mm

Advantages of Wood Gasification Boilers ATMOS

  • Option to burn large pieces of wood 
  • Large space for wood – long burning time – up to 12 hours, depending on boiler type
  • High efficiency 87 – 92 % – primary and secondary air is preheated to a high temperature
  • Ceramic combustion chamber
  • Ecological burning – boiler class 5 – EN 303-5:2012, ECODESIGN 2015/1189
  • Exhaust fan – dust-free ash removal, smokeless boiler room
  • Cooling loop protecting against overheating – without risk of boiler damage ​ ​
  • Automatic shutdown of the boiler after the fuel has burned out – flue gas thermostat
  • Comfortable ash removing – large space for ash (when burning wood, clean it 1x / week)
  • Boiler without tube heat exchanger – easier cleaning
  • Small size and low weight
  • Possibility of choosing a door R / L (right/left) for selected types
  • Possibility of connection without accumulation tank
  • High quality

Installation

ATMOS boilers must be connected via the LADDOMAT 22 or ESBE thermoregulation valve (three-way valve controlled by actuator in case of using electronic regulation ACD 03/04) to achieve keeping the minimum temperature of water returning to boiler at 65 °C. The temperature of water exiting the boiler must be permanently kept between 80 – 90 °C. The default configuration of all boilers includes a cooling circuit to prevent overheating. We recommend installing boilers with accumulation tanks.

Boilers regulation

Electromechanical regulation – boiler performance is regulated by an air regulating valve controlled by a draft regulator, FR 124 type, which automatically opens or closes the air valve according to the set water outlet temperature (80 – 90 °C). In addition to performance regulation, the draft regulator helps protect the boiler against overheating. Its advantage is a quick ignition and firing up to the required output when the air valve is fully open. The boilers are equipped with a control thermostat on the instrument panel, which controls the exhaust fan according to the set water outlet temperature (80 – 85 °C) and a flue gas thermostat, which is used to shut down the boiler and turn off the exhaust fan after the fuel has burned out. In the case of connecting a boiler with accumulation tanks, the flue gas thermostat also controls the operation of the pump in the boiler circuit.

The advantage of regulation and design of ATMOS boilers is that the boilers work with a good chimney draft up to 70 % of the nominal power even without a fan.

 

 

Panel composition:
Main off switch, safety thermostat, thermometer, regulator thermostat and combustion thermostat

Electro-mechanical regulation is an optimum solution for easy management of the operation of the boiler (ventilator). The design of the panel with standard regulation is a basic design for all produced boilers.

 

 

Equithermal regulation ACD 03

Each boiler can be equipped with a modern touch electronic control ATMOS ACD 03 for controlling the entire heating system depending on the outdoor temperature, room temperature and time. It´s designed for comfortable control of the hot water system of the heated building. The controller contains functions for direct control of the boiler, boiler circuit, three heating circuits, domestic hot water, solar, etc.

 

Equithermal regulation ACD 04

The boilers DC18S, DC25S, DC32S and DC40SX can be ordered from the factory with built-in ATMOS ACD 04  touch screen control.The boilers are allready equipped with all necessary sensors including flue gas temperature sensor (AGF) .This unit is designed for comfortable control of the hot water system of the heated building. The controller contains functions for direct control of the boiler, boiler circuit, three heating circuits, domestic hot water, solar, etc.

 

 

Automatic wood ignition

The automatic ignition of wood is used for planned ignition of the boiler, e.g. before coming home in the afternoon or before arriving at the cottage. The ignition of the fuel is very fast (approx. 5 minutes) and allows the operator to arrive “into the heat”. Fuel ignition can be can be set and scheduled for ATMOS AC32 regulation according to time (48h), according to the heating system requirement or according to the temperature in the accumulation tank. Automatic wood ignition is intended for DC32S and DC40SX boilers.

The ATMOS AC32 electronic regulation allows you to set the delay time or the temperature of the accumulation tank, at which the automatic ignition of wood (AIW) will occur, using the rotary wheel. If we have already installed fuel in the boiler loading chamber and poured pellets in the ignition chamber, we can proceed to planning the heating itself. Ignition can be carried out immediately, after a certain time has passed, after the accumulation tank is empty or according to a signal from a remote device (room thermostat, GSM, WiFi, etc.).

Technical details

 

Description of the boiler drawing
1. Boiler body 23. Cooling loop protecting against overheating
2. Filling door – upper 24. Fan control thermostat (boiler)
3. Ashtray door – lower 25. Door panel – Sibral
4. Exhaust fan (S) 26. Door seal – cord 18 x 18
5. Heat-resistant fitting – nozzle 27. Heat-resistant fitting – ceramic roof
6. Control panel 29. Capacitor for exhaust fan – 1μF
7. Safety thermostat 33. Flue gas brake (DC22SX, DC30SX, DC40SX, DC50S, DC70S)
8. Control flap 35. Waste gas thermostat
10. Heat-resistant fitting – spherical space L + R 36. Safety thermostat (Caution – when overheating push on)
11. Nozzle seal 37. Air braker under the ceramic roof
12. Heat-resistant fitting – half-moon 39. Air braker along spherical space (DC18S)
13. Firing up valve 42. Primary air regulation
14. Heat-resistant fitting – rear part of spherical space 43. Secondary air regulation
15. Cleaning lid
17. Fire valve stem K  – the flue-gas duct neck
18. Thermometer L  – the boiler water outlet
19. Frame screen M  – the boiler water inlet
20. Switch with an indicator light N  – filling valve pipe sleeve
22. Draught regulator – HONEYWELL FR124 P  – sleeve for a sensor of the valve which regulates the cooling loop

 

Boiler dimensions (mm)
  DC18S DC22S DC25S DC30SX DC32S DC40SX DC50S
A 1185 1185 1185 1185 1260 1260 1260
B 758 959 959 959 959 959 1160
C 675* 675* 675* 675* 678 678 678
D 874 874 874 874 950 950 950
E 150 (152)
F 65 65 65 65 69 69 69
G 208 208 208 208 185 185 185
H 933 933 933 933 1008 1008 1008
CH 212 212 212 212 256 256 256
I 212 212 212 212 256 256 256
J 6/4″ 6/4″ 6/4″ 6/4″ 6/4″ 6/4″ 2″

 

Specification Boiler type
DC18S DC22S DC25S DC30SX DC32S DC40SX DC50S
Boiler heat output kW 20 22 27 30 35 40 49,9
Boiler thermal input kW 22,2 24,5 30,0 33,4 39,4 45,0 56,9
Heating surface m2 1,8 2,1 2,3 2,3 2,9 2,9 3,8
Fuel shaft volume dm3 (l) 60 95 95 95 135 135 180
Filling hole dimensions mm 450 x 260 450 x 260 450 x 260 450 x 260 450 x 260 450 x 260 450 x 260
Prescripted chimney draft Pa / mbar 18 / 0,18 23 / 023 23 / 0,23 24 / 0,24 24 / 0,24 24 / 0,24 25 / 0,25
Max. working water overpressure kPa / bar 250 / 2,5 250 / 2,5 250 / 2,5 250 / 2,5 250 / 2,5 250 / 2,5 250 / 2,5
Boiler weight kg 269 324 326 332 366 368 433
Gas-outlet pipe diameter mm 150 / 152 150 / 152 150 / 152 150 / 152 150 / 152 150 / 152 150 / 152
Ingress protection of electric parts IP 20 20 20 20 20 20 20
Electrical power input (auxiliary) W 50 50 50 50 50 50 50
Electrical input in standby mode W 0 0 0 0 0 0 0
Ignition mode   manual
Efficiency over the entire performance range % 90,1 89,9 89,9 89,9 88,9 88,9 87,7
Boiler class   5 5 5 5 5 5 4
Boiler category   1
Operating mode   non-condensing
Energy efficiency class A+ A+ A+ A+ A+ A+ A+
Flue gas temperature at rated power °C
157 177 177 177 185 185 255
Waste gas combustion products flow weight at nominal output kg / s 0,012 0,014 0,015 0,017 0,020 0,022 0,025
Specified fuel (preffered) Dry wood with a calorific value of 15 – 17 MJ/kg-1, water content 12 – 20 %, diameter 80 – 120 mm
Average consumption for the heating season kg.h-1 20 22 25 30 35 40 50
Prescribed wood length mm 330 530 530 530 530 530 730
Combustion time at nominal output Hours 2 3 3 2 3 2 3
The volume of water in the boiler l 45 58 58 58 80 80 89
Boiler hydraulic loss mbar 0,18 0,21 0,21 0,21 0,20 0,20 0,22
Minimum buffer tank volume l 500 500 500 500 500 500 750
Connecting voltage V / Hz 230/50
EKODESIGN

 

 


High performance boilers

Wood gasification boilers are suitable not only for family houses, but also for businesses premises. High performance boilers are widely used in carpentry shops, manufacturing plants, schools and mountain huts. Every place, where wood is available as cheap fuel. The boilers can be arranged next to each other in a cascade and operated according to the current heat losses of the building.

The advantage of the DC100, DC105S and DC150S boilers is the ability to quickly change the output in two steps, due to the fact that the boilers are equipped with two fans.

Additional information about boilers:

DC70S DC100 DC105S DC150S