Pellet boilers

Automatický kotle na pelety
Boiler D20P

Ecological and fully automatic pellet boilers ATMOS

Boilers are designed in such a way that the burner is built into the left or right side of the boiler, functioning as a heat exchanger, which draws pellets from the storage tank by means of a screw conveyor. The fuel tank is located next to the boiler or in an adjacent room and can be of any arbitrary size (the standard size is 250, 500 or 1000 l). A part of the boiler room can be used for storing pellets before conveying into burner.

Burner operates fully automatic. The burner itself operates as follows. If the burner is triggered (the need to heat arises), the conveyor gets pellets into the burners spout and ignites them using a glowing coil. Following sufficient pellet combustion, the burner is adjusted to the set output where it remains until the system is heated. Thereafter, the burner is switched off and pellets in the burners chamber are burnt out. The whole cycle is repeated again when heating is required.

The boiler output and other burner functions are controlled electronically, which enables an adaptation of the boiler operation to specific system conditions. Addition of fuel, cleaning of the burner combustion chamber and removal of ash is performed once every 1 - 14 days, depending on the quality of pellets. You can add to the boiler automatic ash remover which assures even more comfortable operating.

A great advantage of our pellet boilers D15P. D20P, D30P, D40P and D50P is that you can remove the burner from the boiler and replace it with a lid, and wood can be used for heating the system. These features mean that these boilers offer the same degree of operating comfort and utility value as do boilers running on gas, propane-butane or LFOs. The main advantage is that in comparison with natural gas or LTO,these boilers combust renewable energy sources which makes their prospects look very good.

Boiler D14P, D21P and D25P
 

Advantages of pellet boilers ATMOS

  • High comfort of heating
  • high efficiency 90 % - 93 % depending on type of pellets – low consumption of fuel
  • Ecological burning - boiler class 5 - ČSN EN 303-5, ECODESIGN 2015/1189
  • Automatic operation and swich off the boiler after the fuel burns out
  • Automatic ash removing – in case of installing with ash remover

 

 

 

 

Pellets heating

Pellets

Most of you already have some experience in using wood or wooden briquettes for heating either in boilers or fireplaces. These fuels are widely available at reasonably good prices. A new product, not yet known by all, is the so-called pellets, which are produced in a similar way as wooden briquettes by high-pressure pressing of waste wood (dry sawdust and chips) without any binder. Good quality pellets are made of soft wood without bark. So called white pellets which ensure trouble free operation of the boiler.

Pellets can be produced by the same way from hard wood or wood with bark so called dark pellets but these can cake in the burning chamber and can cause problems. The same way pellets from straw or other biological wastes are made. (e.g. poppy head pellets, rape pellets, turf pellets, etc.) The most frequently used pellet size is with a diameter of 6, 8 and 9 mm and a length of 5 to 25 mm. The heating value is approximately the same as for wooden briquettes, ranging from 14 to 19 MJ/kg. The price of pellets produced by Czech producers, of which there are currently more than fifteen, is 4500,- to 6500,- CZK per ton.

Pellets are currently supplied in the Czech Republic in PVC bags (usually 15, 20 or 25 kg). Abroad, however, pellets are delivered in cistern trucks from which suppliers fill any type of tank, as in the case of LFO (light fuel oil). It is very important to store pellets in a dry place to prevent their deterioration.

 

automatic pellet boiler D21P with pellet burner Atmos A25
+ conveyor DA 1500
+ pellet tank 500 l (325 kg)
+ buffer tank with internal boiler for domestic hot wather ans solar exchanger

 


Boiler room
with separate pellet tank 500 l


Boiler room
with build in pellet storage 5m3

Other examples of pellet boiler room

 

Pellet burners

Hořák ATMOS A25

PELLET BURNERS ATMOS A25/A45/45

Specified fuel: good quality pellets with 6 – 8 mm diameter, 5 - 25 mm lenght and 16 - 19 MJ.kg-1 caloric power (white pellets).

The burner screen: used to display the current status of the burner and adjusting her functions

Burner control: with an AC07X (AC07) electronic control unit that controls the operation of the external conveyor, two ignition spirals and the fan in accordance with requirements of the boiler and the heating system. The electronic system is rotected with the safety thermostat of the boiler, safety thermostat at the pellet supply to the burner, the fan speed transducer and the flame sensing photocell.The operation of the burner is indicated on the electronic control display.

Fuel feeding: with an external auger conveyor controlled from electronic regulation of burner.

Ignition of fuel: automatic assisted by two electric ignition spirals.

Basic functions of turner:
The possibility of using two spare outputs R and R2 for various applications
The possibility of the involvement of four different sensors TS, TV, TK a TSV
TS - sensor on the tank bottom
TV - sensor on the tank top
TK - boiler sensor or middle sensor on the tank
TSV - flue gas sensor or solar panel sensor

  • burner controlling it in accordance with two temperatures (sensors) on the buffer tank
  • control of boiler fan from burner with the help of the auxiliary output
  • control of boiler pump from burner with the help of the auxiliary output
  • control of the solar system directly from the burner
  • automatic start of the burner after burning of wood for boilers DCxxSP

Pellet burnes for boilers - D14P, D15P, D20P, D21P, D25P

ATMOS A25 - output 4,5 - 24 kW
 

Burners are able to burn only good quality white pellets from soft wood without bark ø 6 - 8 mm, lenght 10 - 25 mm with heating power 16 - 19 MJ.kg-1. Burners are not able to burn pellets with high caking property in the burning chamber. In such case it is needed to clean the burning chamber in period one a day.

For these burners are appropriate conveyors:

  • Auger pellet conveyor for burner ATMOS A25 - DA1500 lenght1,5 m and diameter 75 mm
  • Auger pellet conveyor for burner ATMOS A25 - DA2000 lenght 2 m and diameter 75 mm
  • Auger pellet conveyor for burner ATMOS A25 - DA2500 lenght 2,5 m and diameter 75 mm
  • Auger pellet conveyor for burner ATMOS A25 - DA3000 lenght 3 m and diameter 75 mm
  • Auger pellet conveyor for burner ATMOS A25 - DA4000 lenght 4 m and diameter 75 mm

Pellet burnes for boilers - D31P, D30P, D40P, D50P

ATMOS A45 - output 8,5 - 49 kW

Burners are able to burn only good quality white pellets from soft wood without bark ø 6 - 8 mm, lenght 10 - 25 mm with heating power 16 - 19 MJ.kg-1.
The adventage of this burner is automatic ignitron pellets by ignition spiral which fires up the pellet when ever is needed. The burner is not suitable to burn dark pellets which can cause clinkering. In such case it is needed to clean the burning chamber in period 1 - 3 days and you lose the comfort of such heating.


Pellet burnes for boiler - D80P

ATMOS A85 - output 24 - 80 kW

The burner is standardly supplied with pneumatic air pressure ash cleaning system which regularly after burning period cleans the burning chamber of the burner. Due to this system the burning chamber does not need to be checked so often. The customer can check it once per 14 days to 1 month.

Burner A85 contains the same features as smaller burners ATMOS A25 and A45. The boiler D80P with burner A85 must always be installed with a buffer tank of minimal volume 1000 l. In such system we use program of the burner controlling it in accordance with two temperatures (sensors) on the buffer tank.

For these burners are appropriate conveyors:

  • Auger pellet conveyor with shaft for burner ATMOS A45/85 - DRA50 lenght 1,7 m and diameter 80 mm
  • Auger pellet conveyor with shaft for burner ATMOS A45/85 - DRA50 lenght 2,5 m and diameter 80 mm
  • Auger pellet conveyor with shaft for burner ATMOS A45/85 - DRA50 lenght 4 m - and diameter 80 mm
  • Auger pellet conveyor with shaft for burner ATMOS A45/85 - DRA50 lenght 5 m - and diameter 80 mm

 

Flame of the ATMOS A25 pellet burner in D20P pellet boiler 

 

Technical data

D14 P a D21 P D 15 P D 20 P D 30 P D 45 P

 

 

D 14 P, D 21 P, D 25 P D 15 P D 20 P D 31 P

TYPE D14P D21P D25P D31P D15P D20P D30P D40P D50P D80P
A 1207 1207 1207 1307 1405 1405 1405 1405 1405 1663
B 570 570 670 882 589 652 954 954 1052 1410
C 620 620 620 620 606 606 606 606 606 684
D 801 801 801 901 1040 848 848 848 848 1078
E 152 (150) 152 (150) 152 (150) 152 (150) 152 (150) 152 (150) 152 (150) 150 (152) 152 (150) 180
G 215 215 215 215 211 211 211 211 211 211
H 934 934 934 1034 1163 1163 1163 1163 1163 438
CH 221 221 221 221 202 202 202 202 202 202
I 221 221 221 221 - - - - - -
J 6/4" 6/4" 6/4" 6/4" 6/4" 6/4" 6/4" 6/4" 6/4" 2"
Technical data   D14P D21P D25P D31P D15P D20P D30P D40P D50P D80P
Boiler output kW 4 - 14 4 - 19,5 7 - 24 9 - 30 4,5 - 15 6,5 - 22 8,9 - 29,8 8,9 - 40 13,5 - 45 24 - 80
Heating surface m2 1,7 1,7 2 2,2 1,9 2 2,7 2,7 3,6 5,2
Fuel shaft volume dm3 88 88 88 132 70 70 105 105 140 180
Feeding hole dimensions mm 270x450 270x450 270x450 270x450 270x450 270x450 270x450 270x450 270x450 270x450
Specified chimney draught Pa 16 18 22 18 18 15 21 22 23 25
Max.operating water-pressure kPa 250 250 250 250 250 250 250 250 250 250
Boiler weight kg 231 231 254 263 289 305 370 386 430 695
Gas-outlet pipe diameter mm 150/152 150/152 150/152 150/152 150/152 150/152 150/152 150/152 150/152 180
Boiler height mm 1207 1207 1207 1307 1405 1405 1405 1405 1405 1663
Boiler width mm 620 620 620 620 606 606 606 606 606 684
Boiler depth mm 768 768 868 882 470 470 670 954 870 1410
Electric parts ingress protection IP 20
Electric input - at start-up W 522 522 522 520 522 572 530 530 530 635
Electric input - in operation W 42 42 42 97 42 92 97 97 97 142
Boiler efficiency % 90,3 90,3 90,2 90,2 90,4 91,1 92,4 91,0 91,1 91,2
Waste gas temperature at nominal output
(pellet type)
°C 127 147 151 147 141 128 158 157 123 150
Waste gas combustion products flow
weight at nominal output – pellet type
kg/s 0,011 0,015 0,018 0,026 0,012 0,016 0,025 0,031 0,035 0,062
Specified fuel   High quality pellets with 6 - 8 mm diameter, length 5 - 25 mm and 16 - 19 MJ.kg-1 calorific value (white pellets)
Average fuel (pellets) consumption at
nominal output
kg.h-1 3,5 4,5 5,4 6,8 3,7 5 6,8 9,4 10,6 18,8
Boiler water volume l 56 56 62 70 65 82 91 91 117 185
Hydraulic pressure drop mbar 0,18 0,18 0,19 0,19 0,22 0,22 0,23 0,23 0,24 0,25
Equalising tank minimum volume l 500 500 500 500 500 500 750 750 1000 1000
Connecting voltage V/Hz 230/50
Boiler class - ČSN EN 303-5   5 5 5 5 5 5 5 5 5 5
 

Automatic ash removal for DxxP boilers

 Automatic ash removal

As an accessory for every pellet boiler DxxP, which was made after 1.3.2007 you can equip the boiler with automatic ash removal from the boiler body to an additional ash pan. This automatic Ash removing equipment does not require any special attendance and increase comfort during pellet heating.

The boiler is cleaned automasticaly by the auger conveyor with gearbox. It cleans the ash space in the boiler in regular intervals in 1 hour, in 3 hours, in 6 hours, in 12 hours or in 24 hours depending on type of used fuel. It is possible to switch the automatic cleaning manually by pressing the main switch on the boiler. Carefully choose the capacity of the ash pan based on ash content and the used fuel.

 All three types of ash pan are suitable to use with each of mentioned ash cleaner/remover for boilers D31P, D14P, D21P, D25P, D15P, D20P, D30P, D40P, D50P, (D80P - two sizes).

 

Ash cleaner/remover – without ash pan

code for boilers
S0577 D14P, D21P
S0578 D25P, D31P
S0535 D15P, D20P
S0536 D30P, D40P
S0537 D50P
S1080 D80P

Ash pan – needed accessories (red color)

code for boilers D14P, D21P, D25P, D31P, D15P, D20P, D30P, D40P, D50P
S0542 Small - capacity 28 l
Recommended capacity for boilers D14P, D21P, D25P, D15P, D20P when heating with good quality pellets. Cleaning interval 14 - 30 days.
S0544 Middle - capacity 68 l
Recommended capacity for boilers D14P, D21P, D25P, D15P, D20P, D30P, D31P, D40P, D50P when heating with good quality pellets. Cleaning interval 14 - 30 days.
S0546 Big - capacity 135 l
Recommended capacity for boiler D50P when heating with alternative biomass pellets. Cleaning interval 14 - 45 days.
code for boilers D80P
S1068 Middle - capacity 68 l
Intended only for boiler D80P - for screw diameter of 80 mm.
S1069 Big - capacity 135 l
Intended only for boiler D80P - for screw diameter of 80 mm.