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 or 500 l). A part of the boiler room can be used for storing pellets before conveying into burner.

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 wood pellet boilers D15P, D20P, D30P and D45P is the fact that removing the burner from the boiler and replacing it with a lid allows emergency wood burning. 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.

Advantages of pellet boilers ATMOS

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. Only pellets made of soft bark-less wood, i.e. "white pellets" which ensure trouble free and reliable operation of the boiler are considered quality pellets. At present, however, some producers add biological binding agents in order to increase solidity of the pellets for pneumatic transport. These pellets can be burned, but the amount of ash and poorly burned butts increases.

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. Burners produced by our company can burn these pellets, but the firing chamber must be cleaned at least once per day. When burning high-quality pellets without binding agents or bark, the firing chamber should be cleaned once every seven or thirty days. 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 3500,- to 5000,- 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). However, it is necessary to keep several rules which prevent crushing the pellets during pneumatic transport.
The pellets must not drop directly on the hard wall of the hopper; they should drop on a screen which is suspended in the centre of the chamber from the ceiling. This method eliminates crushing pellets into fragments and dust. It is important to keep the pellets in a dry space to prevent their break-down.

automatic boiler for D 21 P pellets with a burner for Atmos A25 pellets
+ conveyor DA 1500
+ 500 l (325 kg) hopper for pellets
+ buffer storage tank with internal boiler for service water and a solar exchanger

ATMOS A25/A45 PELLET BURNER

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

Burner display serves for displaying the current state of the burner and for setting its functions

Burner control: electronic regulation AC07X (AC07), which controls the running of the external conveyor, two ignition spirals and the ventilator in accordance with the requirements for the boiler and heating system. Electronics are secured by a safety thermostat of the boiler, a safety thermostat for feeding of pellets into the burner, a sensor of ventilator rotations and a photo cell for recording flames. The running of the boiler is signalised on the electronic regulation display.

Basic functions of the boiler:
The option of using two reserve outputs, R and R2 for various applications
Option of connecting four different sensors, TS, TV, TK and TSV
TS - bottom sensor on tank
TV - top sensor on tank
TK - boiler sensor or environment sensor on tank
TSV - sensor of combustion or solar panel

Appropriate pellet burners for D14P, D15P, D20P, D21P, D25P pellet boilers.

Burners IWABO and ATMOS ERATO GP 20 are able to burn only good quality white pellets from soft wood without bark ø 6-8mm, lenght 10-25mm with heating power 16-19 MJ.kg-1. Burners are not able to burn pellets with high caking property in the burning chamber. In this case, the burning chamber should be cleaned once per day.

For these burners, the following conveyors are recommended:

Appropriate pellet burners for D30P, D45P pellet boilers

ATMOS A45 8,5 - 49 kW

The burner is only intended for quality white pellets of soft wood without bark with a diameter of 6 to 8 mm, length 10 to 25 mm and calorific value 16 to 19 MJ.kg-1.

An advantage of the burner is the automatic ignition of fuel with a glowing spiral. The glowing spiral may ignite the pellets whenever it is necessary to make a fire. The burner is not intended for dark pellets which cake the burning chamber of a burner. If you do so, the comfort of heating would be lost, and it would be necessary to clean the burning chamber of the burner every 1 to 3 days.

Pro tyto hořáky jsou určeny tyto dopravníky:

When using small sized pellets with the ATMOS A50 burner, we recommend always using conveyors with central shaft DRA50 – 1.7 and DRA50 – 2.5 m for achieving the required performance. The conveyor incline should be larger than 45°.

Cross-section of the D 14 P, D 21 P, D 25 P Boiler

Cross-section of the D 15 P, D 20 P, D 30 P, D 45 P Boiler

Cross-section of the Boiler

Automatic ash removal for system for the DxxP boilers

TYP	D 14 P	D 21 P	D 25 P	D 31 P	D 15 P	D 20 P	D 30 P	D 40 P	D 50 P
A	1207	1207	1207	1307	1405	1405	1405	1405	1405
B	570	570	670	882	589	652	954	954	1052
C	620	620	620	620	606	606	606	606	606
D	801	801	801	901	1040	848	848	848	848
E	152 (150)	152 (150)	152 (150)	152 (150)	152 (150)	152 (150)	152 (150)	150 (152)	152 (150)
G	215	215	215	215	211	211	211	211	211
H	934	934	934	1034	1163	1163	1163	1163	1163
CH	221	221	221	221	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"

TECHNICAL DATA		D14P	D21P	D 25 P	D 31 P	D15P	D20P	D30P	D40P	D50P
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
Heating surface	m²	1,7	1,7	2	2,2	1,9	2	2,7	2,7	3,6
Fuel shaft volume	dm3	88	88	88	132	70	70	105	105	140
Dimensions of filling opening	mm	270x450	270x450	270x450	270x450	270x450	270x450	270x450	270x450	270x450
Specified chimney draught	Pa	16	18	22	18	18	15	21	22	23
Maximum working water pressure	kPa	250	250	250	250	250	250	250	250	250
Boiler weight	kg	231	231	254	263	289	305	370	386	430
Outlet orifice diameter	mm	152	152	152	152	152	152	152	150/152	152
Boiler height	mm	1207	1207	1207	1307	1405	1405	1405	1405	1405
Boiler width	mm	620	620	620	620	606	606	606	606	606
Boiler depth	mm	768	768	868	882	470	470	670	954	870
Cover for el. parts	IP	20	20
Electric power - upon activation	W	522	522	522	520	522	572	530	530	530
Electric power - during operation	W	42	42	42	97	42	92	97	97	97
Boiler efficiency	%	90,3	90,2	90,2	> 90,2	90,4	91,1	92,4	90,1	91,1
Temperature of combustibles at nominal output (pellets)	°C	127	147	151	147	141	128	158	157	123
Weight flow of combustibles at nominal output (pellets)	kg/s	0,011	0,015	0,018	0,026	0,012	0,016	0,025	0,031	0,035
Specified fuel		kvalitní pelety o průměru 6 - 8 mm o výhřevnosti 15 - 18 MJ.kg-1	kvalitní pelety o průměru 6 - 8 mm o délce 5 až 25 mm a výhřevnosti 16 - 19 MJ.kg-1 (bílé pelety)
Emergency extra fuel supply			suché dřevo o výhřevnosti 15 - 17 MJ.kg-1 o obsahu vody 12 - 20 %, průměru 80 - 150 mm
Average fuel consumption - pellets at nominal output	kg.h-1	3,5	4,5	5,4	6,8	3,7	5	8,6	9,4	10,6
Maximum log length	mm					310	310	510	510	710
Burning duration at nominal output - for wood	hours					2	2	2	2	2
Water volume in boiler	l	56	56	62	70	65	82	91	91	117
Hydraulic loss of boiler	mbar	0,18	0,18	0,19	0,19	0,22	0,22	0,23	0,23	0,24
Minimum volume of buffer tank	l	500	500	500	500	500	500	750	750	1000
Connecting voltage	V/Hz	230/50	230/50
Boiler class pursuant to ČSN EN 303-5		5	5	5	5	5	5	5	5	5
Subsidised boilers in the Czech Republic		•	•	•	•	•	•	•	•	•

Automatic ash cleaner/remover from the boiler

As an accessorie for every boiler DXXP made after 1.3.2007 you can buy automatic ash cleaner/remover from boiler to added external ash pan /30/. The automatic ash cleaner/remover does not need any special attendance and increase comfortablë use of boiler.

Ash removal is performed automatically by means of a screw conveyor with a gear unit which removes the ashes from a chamber under the burner at regular intervals after twelve hours, three hours or one hour according to the setting for a particular type of fuel. The automatic ash-removal system can be activated manually by turning on and off a 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 D15P, D20P, D30P and D45P.

Ash cleaner/remover – without ash pan

Code
S0577	for boilers D14P, D21P
S0535	for boilersD15P, D20P
S0536	for boilers D30P
S0537	for boilers D45P

Ash pan – needed accessories (red color)

Code
S0542	Small - capacity 28 l Recommended capacity for boilers D14P, D21P, D15P, D20P when heating with good quality pellets. Cleaning interval 7 - 30 days.
S0544	Middle - capacity 68 l Recommended capacity for boilers D14P, D21P, D15P, D20P, D30P, D45P when heating with good quality pellets. Cleaning interval 14 - 30 days.
S0546	Big - capacity 135 l Recommended capacity for boiler D45P when heating with alternative biomass pellets. Cleaning interval 14 - 45 days

Automatické vybírání popela

Ecological and fully automatic pellet boilers ATMOS