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  • Automatic wood ignition
  • Technical details

DC25GD

Gasification boiler for wood

  • Rated power 25 kW

  • Boiler efficiency 92,5 %

  • Emission class nr. 5 (Ecodesign)

  • Log lenght 530 mm

DCxxGD boilers meets 5th emission class (Energy efficiency class A+), Ekodesign.

Advantages of wood gasification boilers ATMOS

  • option to burn large pieces of wood
  • large fuel container – long time of burning
  • tube heat exchanger
  • high efficiency over 90 % – primary and secondary air is preheated to a high temperature
  • ecological burning – boiler class 5 – EN 303-5:2012, ECODESIGN 2015/1189
  • exhaust fan – ash cleaning without dust, boiler room without smoke
  • cooling loop protecting against overheating – without risk of boiler damage
  • exhaust fan automatically switches off when the fuel burns out – exhaust (flue gas) thermostat
  • comfortable ash removing – large space for ash (when burning wood you have to clean it once per week)
  • small size and low weight
  • high quality

Installation

ATMOS boilers must be connected via the LADDOMAT 22 or thermoregulatory valve (three-way valve controlled with actuator) 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.

MODEL OF DCxxGD BOILERS ARE ONLY INTENDET FOR CONNECTION WITH ACCUMULATION TANKS OF SUFFICIENT CAPACITY WITH A MINIMUM OF 55 LITRES PER 1 kW OF INSTALLED BOILER OUTPUT.

Boilers regulation

Electromechanical – output of the boiler is controlled with a regulating air flap operated with the draught regulator, FR 124 type, which automatically opens or closes the safety valve according to a set output temperature of water (80 – 90 °C). When setting the power regulator, much attention should be paid because the regulator has another important function other than power regulation – it also secures the boiler against overheating. A controlling thermostat located on the boiler panel regulates the exhaust fan according to a set temperature (80 – 85 °C). A temperature lower by 5 °C should be set on the controlling thermostat rather than on the FR 124 draught regulator.

Boilers are also equipped with the waste gas thermostat which serves to switch off the exhaust fan after the wood burns out.

The boiler runs at a reduced output even without a fan – heating is not lost when the electric power fails. At up to 70 % of its rated output, the boiler can be operated without a ventilator (for boilers DCxxGD we do not recommend operation when an exhaust fan is switched off).

Boiler control panel with standard regulation

 

Panel composition:
Main switch, safety thermostat, thermometer, control thermostat and flue gas thermostat.

Electromechanical control is the optimal solution for controlling the operation of the boiler (fan) in a simple way. The design of the panel with standard regulation is the basic design for all manufactured 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. This regulation is able to control the boiler itself with a fan with many other functions.

Boiler control panel with equithermal regulation ATMOS ACD 03

 

 

Equithermal regulation ACD 04

The boilers DC18GD, DC25GD and DC30GD can be ordered from the factory with built-in ATMOS ACD 04 touch screen control only with with combination with Automatic wood ignition (AIW).The boilers are allready equipped with all necessary sensors.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.

Boiler control panel with equithermal regulation ATMOS ACD 04

Automatic wood ignition

Automatic wood ignition is used for the planned ignition of the boiler, eg before the arrival home in the afternoon or before arrival at the cottage. Ignition of the fuel is very fast (approx. 5 minutes) and allows the boiler operator to come “warm”. Fuel ignition can be set and scheduled to control ATMOS ACD 04 according to time (weekly program), according to the requirements of the heating system or according to the temperature in the Accumulation tank.

 

Drawings of boilers with automatic wood ignition Drawing of the ignition device
1. Boiler body 19. Intake duct – air duct 1.  Ignition spiral plate
2. Stocking door (upper) 20. Main switch 2.  Ignition spiral
3. Ash-pan door (lower) 22. Draught regulator – Honeywell FR 124 3.  Removable ignition chamber
4. Exhaust fan 23. Cooling loop protecting against overheating 4.  Screw lid (always tightened during operation)
5. Heatproof shaped piece – nozzle 24. ATMOS ACD 04 controller 5.  Removable blanking chamber
6. Control panel 25. Door filling – Sibral
small – thick for upper door
small – thin for lower door
6.  Pellet filling scoop
7. Safety thermostat 26. Door sealing – cord 18 x 18
8. Regulating flap 30. Capacitor for exhaust fan – 1μF
9. Heat proof shaped piece – for type GD
– combustion area side)
33. Tube heat exchanger (tubular)
10. Heat proof shaped piece – for type GD
– spherical space
35. Pocket for thermostats (sensors)
11. Sealing – nozzle – 12 x 12 (14 x 14) 36. Locking screw
12. Heatproof shaped piece – half moon  37. Ignition device
13. Ignition valve
14. Heat proof shaped piece – for type GD
– rear face of spherical space
K flue gas duct neck
15. Cleaning lid L water outlet from
16. Frame shield M boiler – water inlet to
17. Ignition valve pulling rod N boiler – filling valve
18. Fuse T6,3A/1500 – type H P pipe sleeve – sleeve for cooling loop control valve sensor (TS 131, STS 20)

Technical details

 

Description of the boiler drawing
1. Boiler body 18. Thermometer
2. Filling door – upper 19. Supply air duct
3. Ashtray door – lower 20. Switch with an indicator light
4. Exhaust fan (S) 22. Draught regulator – HONEYWELL FR124
5. Heat-resistant fitting – nozzle 23. Cooling loop protecting against overheating
6. Control panel 24. Fan control thermostat (boiler)
7. Safety thermostat 25. Door panel – Sibral
8. Control flap 26. Door seal – cord 18 x 18
9. Heat-resistant fitting – side part 27. Waste gas thermostat
10. Heat-resistant fitting – spherical space L + R 30. Capacitor for exhaust fan
11. Nozzle seal – 12 x 12 (14 x 14) 33. Tube heat exchanger – tube sheet
12. Heat-resistant fitting – half-moon  
13. Firing up valve K  – the flue-gas duct neck
14. Heat-resistant fitting – rear part of spherical space L  – the boiler water outlet
15. Cleaning lid M  – the boiler water inlet
16. Frame screen N  – filling valve pipe sleeve
17. Fire valve stem P  – sleeve for a sensor of the valve which regulates the cooling loop

 

Boiler dimensions (mm) Boiler type
DC18GD DC25GD DC30GD DC40GD DC50GD
A 1281 1281 1281 1435 1435
B 820 1020 1020 1120 1120
C 680 680 680 680 680
D 945 945 945 1095 1095
E 150/152 150/152 150/152 150/152 150/152
F 87 87 87 82 78
G 185 185 185 185 185
H 1008 1008 1008 1152 1152
CH 256 256 256 256 256
I 256 256 256 256 256
J 6/4″ 6/4″ 6/4″ 2″ 2″

 

Specifications Boiler type
DC18GD DC25GD DC30GD DC40GD DC50GD
Rated power kW
19 25 29,8 40 49
Heating surface m2 2,5 3,1 3,1 3,8 4,1
Fuel shaft volume dm3 (l)
80 120 120 160 160
Filling hole dimensions mm 450 x 260 450 x 260 450 x 260 450 x 260 450 x 260
Prescripted chimney draft Pa/mbar
16/0,16 18/0,18 20/0,20 22/0,22 24/0,24
Max. working water overpressure kPa/bar 250/2,5 250/2,5 250/2,5 250/2,5 250/2,5
Boiler weight kg
376 469 466 548 565
Gas-outlet pipe diameter mm 150/152 150/152 150/152 150/152 150/152
Ingress protection of electric parts IP 20 20 20 20 20
Electric input W 50 50 50 50 50
Efficiency over the entire performance range %
90,3 92,5 91,3 90,5 92,0
Boiler class   5 5 5 5 5
Energy efficiency class   A+ A+ A+ A+ A+
Waste gas temperature at nominal output °C 145 127 148 175 183
Waste gas combustion products flow weight at nominal output kg/s 0,014 0,017 0,017 0,021 0,025
Specified fuel (preffered)   Dry wood with a calorific value of 15 – 18 MJ/kg-1, water content 12 – 20 %, diameter 80 – 120 mm
Average fuel consumption for the heating season kg.h-1 5,1 6,1 7,7 10 13
Wood lenght mm
330 530 530 530 530
Combustion time at nominal output Hours 2 2 2 2 2
The volume of water in the boiler l
73 105 105 112 128
Boiler hydraulic loss mbar  0,22 0,22 0,22 0,23 0,24
Minimum volume of accumulation tank l 1045 1375 1639 2200 2695
Regulation temperature settings °C from 75 to 95
Connecting voltage V/Hz  230/50
Minimum return water temperature during operation °C 65
EKODESIGN
All boilers in DOKOGEN line are only intendet for connection with an ACCUMULATION TANKS of sufficient capacity with a minimum of 55 litres per 1 kW of instaled boiler output.