Advantages of ATMOS coal gasification boilers
- Possibility to burn quality brown coal and wood as a substitute fuel
- Large fuel tank = long burning time
- High efficiency 81 to 88 % depending on the type – primary and secondary air is preheated to a high temperature
- More environmentally friendly combustion – boiler according to EN 303-5:2012 class 4 and 5, EKODESIGN 2015/1189
- Exhaust fan – dust-free ash removal, smoke-free boiler room
- Cooling loop against overheating – without the risk of damaging the boiler
- Automatic shutdown of the boiler after the fuel burns out – flue gas thermostat
- Convenient ash removal – large ceramic combustion chamber for ash (for wood collect 1x/week, for coal 1x/day)
- Easy to clean – (C25ST, C32ST, C50S – boilers with tube heat exchanger)
- Small size and low weight
- Choice of door left / right
- High Quality
Installation
ATMOS wood gasification boilers must be connected with LADDOMAT 22 or a thermoregulation valve (three-way valve controlled by an actuator in case of using electronic control ATMOS ACD 03) to achieve a minimum return water temperature to the boiler of 65 °C. The boiler outlet temperature must be constantly maintained in the range of 80 – 90 °C.
All boilers are supplied in a basic design with a cooling loop against overheating. We recommend installing boilers with accumulation tanks, which will reduce fuel consumption and increase heating comfort.
- ATMOS Brown coal combi C20S, C25ST, C30S, C32ST, C40S, C50S
- ATMOS Combi brown coal boiler C18S
- Dimension of Application chamber
- View of top feeding chamber
- Lower combustion chamber with flame
- View of bottom feeding chamber
- Exhaust fan and flue gas neck
- Boiler upper cleaning lid
- Boiler wiring diagram with Laddomat 22 without storage tanks
- Boiler wiring diagram with ACD 03 control and storage tanks
Boiler regulation
Electromechanical – power regulation is performed by an air control damper controlled by a draft regulator, type FR 124, which automatically according to the set water outlet temperature (80 – 90 °C) opens or closes the air damper. It is necessary to pay increased attention to the setting of the output regulator, because in addition to the output regulation, the regulator performs another important function of securing the boiler against overheating. The boiler is also equipped with a control thermostat located on the boiler panel, which controls the exhaust fan according to the set outlet temperature (80 – 85 °C). The temperature on the control thermostat should be 5 °C lower than on the FR 124 draft regulator.
In addition, the boilers are equipped with a flue gas thermostat, which is used to turn off the exhaust fan after the fuel has burned out. The boilers operate at a reduced output of up to 70 % of the rated output even without a fan.
- Regulating air flap
- Draught regulator FR 124

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
Technical details
- CxxS
- CxxST
Description of the boiler drawing | |||
1. | Boiler body | 21. | Tube heat exchanger – tube sheet (C25ST, C32ST, C50S) |
2. | Filling door – upper | 22. | Draught regulator – HONEYWELL FR124 |
3. | Ashtray door – lower | 23. | Heat-resistant fitting – front cube |
4. | Exhaust fan (S) | 24. | Fan control (boiler) thermostat |
5. | Heat-resistant fitting – rear cube | 25. | Door panel – Sibral |
6. | Control panel | 26. | Door seal – cord 18 x 18 |
7. | Safety thermostat | 27. | Combustion area screen – rear |
8. | Control flap | 28. | Waste gas brake – along spherical space (C50S) |
9. | Grate (segment) | 30. | Waste gas thermostat |
10. | Heat-resistant fitting – spherical space | 31. | Capacitor for exhaust fan – 1μF |
11. | Grate pipe | 32. | Cooling loop protecting against overheating |
12. | Heat-resistant fitting – half-moon | 33. | Primary air regulation |
13. | Firing up valve | 34. | Secondary air regulation |
14. | Heat-resistant fitting – rear part of spherical space | ||
15. | Cleaning lid | ||
16. | Grate lever | K | – the flue-gas duct neck |
17. | The rod for firing up flap | L | – the boiler water outlet |
18. | Thermometer | M | – the boiler water inlet |
19. | Frame shield | N | – filling valve pipe sleeve |
20. | Switch with an indicator light | P | – sleeve for a sensor of the valve which regulates the cooling loop |
Boiler dimensions (mm) | ||||||||
C15S | C18S | C20S | C25ST | C30S | C32ST | C40S | C50S | |
A | 1185 | 1185 | 1435 | 1435 | 1435 | 1435 | 1435 | 1435 |
B | 658 | 758 | 758 | 758 | 858 | 858 | 958 | 1117 |
C | 595 | 675* | 675* | 675* | 675* | 675* | 675* | 675* |
D | 874 | 874 | 1121 | 1121 | 1121 | 1121 | 1121 | 1115 |
E | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 |
F | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 78 |
G | 210 | 210 | 210 | 210 | 210 | 210 | 210 | 210 |
H | 933 | 933 | 1177 | 1177 | 1177 | 1177 | 1177 | 1177 |
CH | 212 | 212 | 212 | 212 | 212 | 212 | 212 | 212 |
I | 212 | 212 | 212 | 212 | 212 | 212 | 212 | 212 |
J | 6/4″ | 6/4″ | 6/4″ | 6/4″ | 6/4″ | 6/4″ | 2″ | 2″ |
* the width of the boiler after removing the side hoods is 555 mm
Specifications | Boiler type |
||||||||
C15S | C18S | C20S | C25ST | C30S | C32ST | C40S | C50S | ||
Boiler heat output | kW | 16 | 20 | 25 | 25 | 32 | 32 | 40 | 48 |
Boiler thermal input | kW | 17,7 | 22,5 | 29,6 | 28,1 | 37,6 | 36,1 | 46,8 | 53 |
Heating surface | m2 | 1,6 | 1,8 | 2,1 | 2,6 | 2,6 | 3,1 | 3,2 | 3,5 |
Fuel shaft volume | dm3 (l) | 45 | 60 | 90 | 90 | 110 | 110 | 135 | 135 |
Feeding hole dimensions | mm | 450 x 260 | 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 | 16/0,16 | 20/0,20 | 23/0,23 | 23/0,23 | 25/0,25 | 25/0,25 | 28/0,28 | 28/0,28 |
Max. working overpressure of water | kPa/bar | 250/2,5 | 250/2,5 | 250/2,5 | 250/2,5 | 250/2,5 | 250/2,5 | 250/2,5 | 250/2,5 |
Boiler weight | kg | 273 | 295 | 351 | 379 | 395 | 415 | 434 | 492 |
Gas-outlet pipe diameter | mm | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 | 150/152 |
Ingress protection | IP | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
Electrical power input (auxiliary) | W | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
Electrical input in standby mode | W | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Ignition mode | manual | ||||||||
Efficiency over the entire performance range | % | 90,4 | 88,9 | 84,5 | 88,9 | 85 | 88,6 | 85,4 | 90,5 |
Boiler class | 5 | 5 | 4 | 5 | 4 | 5 | 4 | 5 | |
Boiler category | 1 | ||||||||
Operating mode | non-condensing | ||||||||
Energy efficiency class | B | C | C | C | C | C | C | B | |
Waste gas temperature at nominal output | °C | 141,2 | 169,3 | 219 | 164 | 210 | 180,5 | 222 | 172,5 |
Waste gas combustion products flow weight at nominal output | kg/s | 0,010 | 0,012 | 0,015 | 0,016 | 0,018 | 0,018 | 0,022 | 0,025 |
Specified fuel (preffered) | Brown coal ORECH 1 with a calorific value of 17 – 20 MJ/kg-1 | ||||||||
Spare fuel (firing up) | Dry wood with a calorific value of 15 – 17 MJ/kg-1, water content 12 – 20 %, diameter 80 – 120 mm | ||||||||
Maximum wood length | mm | 250 | 330 | 330 | 330 | 430 | 430 | 530 | 530 |
Combustion time at nominal output for coal | Hours | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 4 |
Combustion time at nominal output for wood | Hours | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 2 |
The volume of water in the boiler | l | 37 | 45 | 64 | 68 | 70 | 74 | 77 | 95 |
Boiler hydraulic loss | mbar | 0,17 | 0,18 | 0,20 | 0,20 | 0,22 | 0,22 | 0,22 | 0,22 |
Connecting voltage | V/Hz | 230/50 |