Pv20a pelltech коды ошибок

Pellet burner PV 20a 
User manual





PV 20a
Table of content
Table of content.....................................................................................................................................2
Description.............................................................................................................................................4
Fuel.....................................................................................................................................................7
Installation..............................................................................................................................................7
Boiler requirements................................................................................................................................8
Burner...............................................................................................................................................10
Pellet container................................................................................................................................11
External auger..................................................................................................................................12
Electrical connections.......................................................................................................................12
Operation.............................................................................................................................................14
Starting.............................................................................................................................................15
Log....................................................................................................................................................15
Settings.............................................................................................................................................16
Info Menu.........................................................................................................................................17
Languages.........................................................................................................................................17
Refilling fuel......................................................................................................................................18
Maintenance....................................................................................................................................19
Working principle.................................................................................................................................21
Testing..............................................................................................................................................21
Loading.............................................................................................................................................21
Igniting..............................................................................................................................................21
Preburn.............................................................................................................................................21
Burning.............................................................................................................................................22
Auger control................................................................................................................................22
Fuel level detection......................................................................................................................22
Output power levels ....................................................................................................................22
Hold flame........................................................................................................................................22
End burn...........................................................................................................................................23
End blow...........................................................................................................................................23
Controller board description................................................................................................................24
Problems and solutions........................................................................................................................26
Warranty..........................................................................................................................................27
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PV 20a
Safety precautions
Do not start the burner before it is connected to the boiler and the boiler is connected to the 
chimney. 
It is recommended to wear a respirator while handling pellets.
The boiler room where the burner is installed must fulfill all rules and recommendations given by 
authorities.
All electrical connections must be done by trained professionals.
No flammable materials must be stored near the burner.
Warnings
 Changing the construction of the burner without written permission from the 
manufacturer is forbidden.
 Use only spare parts provided or approved by the manufacturer in order to avoid 
any damage to the burner and dangers resulting from it
 Welding is allowed only after disconnecting the burner from electric supply. The 
circuit board must be removed from the burner.
 Do not open any boiler door while the burner is in operation. 
The burner complies with following directives and standards
Directive 2004/108/EC 
Directive 2006/95/EC
Directive 2001/95/EC 
Directive 2006/42/EC
EN 15270 2008
EN 230 2005
EN 60370-2-5 2002
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PV 20a
Package content
The burner is shipped with following components included:
1. Grate
2. Burner
3. Brackets for hose (2x)
4. Flange
5. Ceramic seal
6. 7-pole boiler connector
7. Hose
8. User manual
Description
PV 20a is a pellet burner that is intended to be used with 6 or 8mm wooden pellets. You cannot use 
any other fuel to run this burner.
The unique construction of PV 20a allows it to be used with different boilers:  liquid fuel, solid fuel 
and universal boilers. The PV 20a burner is connected to the boiler with a 90 mm flange (similar to oil 
burners).
The burner is equipped with a safety thermostat, a melting chute, temperature sensor and auxiliary 
battery for protection against back-burning. 
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PV 20a
Burner main components are shown on Figure 1
1. Burning chamber
2. Feed screw
3. Safety cut off thermostat
4. Mains transformer
5. User interface joystick
6. User interface screen
7. Auxiliary battery
8. Connectors
9. Feed screw motor
10. Fan
11. Fuel level sensor
12. Mounting nut
13. Flame detector
14. Igniter
15. Grate
Figure 1 Burner main components
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PV 20a
Figure 2 Dimensions
Table 1 Specification
Unit PV 20a
L total length mm 530
L1 burner body length mm 230
L2 burning chamber length mm 170
⌀D burning chamber diameter  mm 146
⌀D1 burning chamber neck diameter mm 88.9
⌀D2 internal feeder inlet diameter mm 60
H total height mm 250
H1 burner housing height mm 200
W total width mm 220
W1 burner housing width mm 204
Mass kg 11.2
Supply voltage VAC 220-240
Power max W 570
Power average W 25 - 40
Power at standby W 7
Noise dB 52
Emission class
1
- 5
Operating temperature C
o
0-60
Nominal heat input kW 20
Min heat input kW 10
1. According to EN 15270
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PV 20a
Fuel
PV 20a uses premium wooden pellets as fuel.  Wood pellets are concentrated and homogenized fuel 
made from sawdust and cutter shavings. Pellets are pressed with high temperature. No extra 
materials are added, pellets are held together by a natural ingredient found in wood – lignin. Pellets 
are CO2-neutral, renewable fuel.  Pellets must be stored in a dry and ventilated room. It is 
recommended to wear a respirator when handling pellets.
Only premium class pellets can be used with PV 20a. Refilling must be carried out before the storage 
runs empty. In case it happened,  burner has to be restarted and the loading time can be up to 20 
minutes that external auger has enough time to refill itself.
Table 2 Pellet properties
Raw material sawdust and cutter shavings
Calorific value 4700-5100 kWh/ton
Volume weight ca 650-670 kg/m
3
Volume of 1 ton 1.5-1.6 m
3
Diameter 6-10 mm
Length 3-5 x diameter
Water content 8-10 %
Ash content Ca 0.5%
To replace 1000 l light oil ca 2 tons or 3 m
3
Installation
You will need the following tools in order to install the burner:
• Spanner no. 13 for fixing the flange of the burner to the boiler
• Spanner no. 10 for connecting the body of the burner with the burning camber
• Cross-head screwdriver for fixing the cover of the burner
• 4 mm hex wrench for fixating the boiler to the flange
In order to install the burner, the boiler must correspond to the following requirements:
• The door of the boiler must have a 90 mm opening (placement opening for the oil burner).
• The thickness of the boiler door must be less than 100mm
• The construction of the boiler must make it possible to open the door of the boiler with the 
burner connected and removing ash from the furnace. If the door of the boiler is too narrow 
for opening it with the burner, then extra hinges must be installed. 
• If there is not sufficient (less than 5Pa) negative pressure in the furnace, a draught fan should 
be installed for the exhaust gases. 
• The boiler room where the burner is installed must fulfill all rules and recommendations 
given by authorities.
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PV 20a
• The boiler must be positioned in a way that there is enough space for cleaning the burner, 
the boiler and the smoke pipe and removing the ash.
If flue gas temperature at the top of the chimney is less than 80C
o
, there is a risk of condensation. In 
this case a pipe should be installed throughout the length of the chimney.
Note: It is recommended to use a flue gas analyzer for adjusting the burner. The burner must be 
adjusted using the flue gas analyzer also when you change the size or the quality of the pellets.
Boiler requirements
Pellet burners need regular cleaning and therefore boiler construction must allow the door to be 
opened without removing the burner. The minimum size of opening in boiler depends on the 
position of door hinges and vice versa. Figure 3 below illustrates the situation.  Point C is critical.
In order to keep door width minimum and boiler opening small, a double hinge solution can be used. 
As double hinges add another degree of freedom, door must be fastened on both sides. Slide-out 
doors with guide rails is also an option.
Figure 3 Hinge position and boiler opening size considerations
 
Figure 4 Double hinges
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PV 20a
Boiler firebox length L (Figure 5) should be at least 2,5 x the length  of the burning chamber. For PV 
20a, minimum of 420mm is acceptable (leaving L1 approx. 250mm). The height should be enough to 
leave H1 below the burner about 100mm for ash.
Minimum dimensions L and H for PV 20a: L≥420mm; H≥350mm.
Figure 5 Boiler firebox requirements
Burners are mounted to door using supplied oil burner flange. Bolt hole circle diameter and bolt sizes 
can be customized by using custom flanges. D1 and D2 given in Table 3 are only valid with supplied 
flanges.
Table 3 Mounting holes for boiler door 
Unit
⌀D hole for burning chamber neck mm 90
⌀D1 flange bolt ring diameter mm 130..150
⌀D2bolt holes mm 8..9
Figure 6 Mounting holes with supplied flanges for boiler door
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PV 20a
Burner
In order to install the burner properly, you must go through the following steps:
1. Remove the cover of the burner by loosening 4 screws of the cover. There is no need to remove 
the screws. 
2. Remove the burning chamber from the burner by releasing the M6 nut that connects the halves of 
the burner. Separate the halves of the burner by pulling the burning camber and slightly rotating it at 
the same time.
3. Fix the flange (2) of the burner to the door of the boiler (1). Make sure that the opening of the 
flange and the opening of the boiler door are aligned.  
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PV 20a
4. Fix the burning chamber (8). For that you need to put a ceramic seal (4) on the narrower side of 
the burning chamber and then put the camber through the door of the boiler in a way that the 
rearward wall of the burning chamber would lean on the door of the boiler. Fixate the burning 
chamber with two grub screws (10) to the flange. 
Caution! The burning camber must be placed in a way that the burning grate will be as horizontal as 
possible. The connection between the burner and the boiler must be tight in order to avoid any 
leakage of smoke gases. 
5. Connect the body of the burner to the burning chamber like it was done before disassembling in 
step 2. 
6. Fixate the halves of the burner with a M6 nut (9). The nut has to be rolled tight but not too hard. 
The halves of the burner are connected correctly when there is no space between the mark on the 
connecting tube (a line drawn on the tube with a dark marker) and the body of the burner.
 7. Make sure the halves of the burner are connected correctly. Make sure that when looking through 
the fire tube the igniter end tip is at the same level with the wall. The tube of the inner auger must 
reach through its opening. 
Caution! After the installation of the burner always make sure that the end of the igniter is 
positioned through its opening and not stuck behind the dividing wall.
Pellet container
The burner, the auger and the pellet container are a common system. The size and the location of 
the pellet container depend on the needs and possibilities of the specific boiler room. While choosing 
the pellet container you must keep in mind that:
• If the pellet container is in the same room as the boiler, then the size of the pellet container 
must not exceed 500 liters (approx. 350kg).
• The container must be made of fireproof materials.
• The container must be positioned in a way that the raising angle of the feeding auger does 
not exceed 45°. 
• It is advisable to use a container that can be closed with a cover. 
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PV 20a
External auger
A feeding auger transports pellets from the pellet container to the burner. The burner controls the 
work of the auger. The auger is connected to the burner with a special hose. The hose is made of 
melting material that acts as a safety measure against back-burning. The uppon side of auger (with 
motor) must be fixed to a storage or to some other object nearby (with delivered chain) .
Figure 7 shows correct position for external auger. As the hose is a safety device, it must be placed 
strictly as described below.  The vertical distance between auger outlet and burner inlet must be in 
range of 40..70cm and horizontal displacement 10..20cm (typical auger angle 30
o
..45
o
). External 
auger cannot be installed in position with angle greater than 45
o
. The hose must be in angle of 50
o
 or 
more to ensure free falling of the fuel.
 
Figure 7  External auger installation (units in mm)
Electrical connections
The burner is equipped with a standard oil burner plug that has 7 contacts. There will be different 
connection schemes used for different boilers. Usually the burner is connected to the boiler with a 5- 
wire cable. It is also possible to connect with a 4-wire cable.
Caution! All electrical connections of the burner must be made by a qualified professional.
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PV 20a
Figure 8 Burner 5-wire connection
Figure 9 Burner 4-wire connection
Chs – Chassis grounder  R1 – Flame sensor
M1 – Fan SBB – Controller board
M2 – Flue gas fan* Se – Igniter
M3 – External auger TR – Transformer 
M4 – Internal feeder Tt – Boiler thermostat
Ot – Safety thermostat
*Flue gas fan M2 is installed only if there is not enough draught. The flue gas fan is not included with burner.
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PV 20a
Operation
The burner is controlled via user interface on the front panel. LCD screen (1) displays settings menu, 
event log etc. Yellow light (2) shows the presence of flame in burning chamber. Or if blinking, the 
burner is out of normal operation. Status can be seen on log screen.  Green light (3) indicates if there 
is fuel in the burner. To move in menus, use up and down buttons (4), to change parameter, press 
OK, to go back to LOG press “ESC” button.
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PV 20a
Figure 10 Front panel
Starting
Prior to the initial start-up of the burner make sure that:
• The burner is connected to the boiler
• The boiler thermostat is installed and is functioning properly 
• The boiler thermostat is turned to lowest temperature
• The external auger is installed and connected to the burner
• The smoke duct is connected to the chimney, the dampers for smoke gases are open and 
there is sufficient draught. When the burner is operating, the negative pressure inside the 
boiler must stay between 4-6 Pa 
To turn on the burner, switch on boiler main switch. If burner displays ’Stopped’, then go to settings 
menu and change parameter ’Burner’ from OFF to ON. The display shows ’Waiting’. Now turn boiler 
thermostat to desired temperature. The burner will go to Loading-state. If this is the first run, extern-
al auger needs to be filled with pellets. It can take up to 20 minutes. 
To stop the burning, turn boiler thermostat to lowest point. The burner will now finish the process 
after all fuel is burnt.
Caution! Never turn off a working burner from the main switch of the boiler. Use the thermostat 
switch for that purpose. In order to stop safely, let the burner burn empty. Do not leave the burner 
unattended when it has been necessary to use the emergency stop.
Log
Log screen displays last events (burner states) and their duration. All states are described in Table 4. 
The duration is in form mm:ss (’m’ in the middle) or hh:mm (’h’ in the middle). For example ’Igniting 
01m25 means the burner ignition state lasted 1minute and 25 seconds.  
Last row of the log shows current state. To reach the last row, press the “down” button, until you 
reach the current state. The duration of current state updates every second or minute.
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PV 20a
Table 4 Burner states
Status
Description
STOPPED The burner is not switched on.
WAITING The burner is switched on and waiting for command from the thermostat of the 
boiler.
TESTING Testing the fan, battery, feeder.
LOADING Loading pellets into burner for ignition after the command from boiler thermostat.
LOADING2 Second try if the first ignition was not successful.
IGNITION Loaded amount of pellets are in the burning chamber, igniter and fan are working till 
photocell recognizes flame.
PREBURN Only the fan is working, the igniter is off. Pellets start burning properly.
BURNING Status of normal working: External auger works by level sensor, internal auger and 
fan are working by. Photocell must see the flame.
HOLD FLAME Boiler has reached an estimated temperature and boiler thermostat switched off, 
pilot flame is held in the burning chamber. 
BURN END Boiler has reached an estimated temperature and boiler thermostat switched off the 
burner. The external auger has stopped, the internal feeder and fan are still working 
until all fuel is burned.
END BLOW When photocell doesn`t see any flame only the fan keeps on working with minimum 
speed in order to make sure there is no fuel in burner.
NO PELLETS Level sensor does not detect pellets
NO FLAME There is no flame in the burner more than 120 seconds during burning.
OVERHEAT Temperature in the burner has reached preset temperature and burner turned off.
IGN.ERROR Flame is not recognized after ignition
LEVEL ERR Level dose not reached or level dose not disappear at burning time
FEEDER ERR Jam in feeder or feeder rotation is not detected
FAN ERROR Fan rotation problem
BATTERY LOW Battery is not connected or empty
NO POWER Supply power is not detected – burner works on battery
Settings
To enter settings menu, press OK. To go back to log screen, press ESC.
Table 5 Main menu
Men
u nr
Menu 
parameter ENG
Description Default 
value
Selection list
1 STATUS-> Submenu for status information *
1
2 INFO-> Information from  burner devices *
2
3 BURNER Turn burner ON/OFF OFF ON/OFF
4 HOLD FLAME Flame holding allowed *
3
OFF ON/OFF/AUTO
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PV 20a
5 PELLETS Select fuel quality NORMAL NORMAL/LIGHT/HEAVY
6 POWER Actual power level AUTO  AUTO/10/12/14/16/18/20
7 BASE AIR Fan speed correction for all fan 
speeds
0 -2/-1/0/+1/+2/+3/+4/+5
8 LANGUAGE Language selection *
4
ENG See language list
9 PARAMETERS -> Parameter setup menu
*1 – see “Status menu description” 
*2 – see “Info menu description”
*3 – see “HOLD FLAME” status description
*4 – see “Languages” chapter
Info Menu
To enter info menu, move in the main menu until the row INFO and press OK. Content of info menu 
is following: 
TOTAL =  total amount of pellets burned with this burner. Amount is updated after every 10 kg.
COUNT = amount of pellets burned since last zero. Amount is updated after every 0,1 kg. To zero the 
amount, be sure you are in this menu and hold down OK for 5 sec. 
FAN = fan rotation speed as it is / fan rotation speed as it should be ± base air (selected base air in 
the main menu)
P = currently working power/ power as it should be
T = burner internal temperature
U = Battery voltage level
I = Feeder current
DRAUGHT = when underpressure sensor is connected, draught is shown.
Languages
To change the burner language, move in the main menu until the row LANGUAGES and press OK. 
Choose the requested language and press OK. Burner has following languages: english (ENG), 
estonian (EST), finnish (FIN), french (FRA), german (GER), greek (GRE), latvian (LAT), lithuanian (LIT), 
dutsch (NED), portuguese (POR), russian (RUS), serbian (SRB), spanish (SPA), slovakian (SLV), swedish 
(SWE). 
Table 6 Parameters menu
Parameter  Description Unit Value
Nr Name Default Min. Max.
1 BURN AIR @10kW Fan speed at power level 1 rps 22 20 24
2 BURN AIR @12kW Fan speed at power level 2 rps 25 23 27
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PV 20a
3 BURN AIR @14kW Fan speed at power level 3 rps 27 25 29
4 BURN AIR @16kW Fan speed at power level 4 rps 30 28 32
5 BURN AIR @18kW Fan speed at power level 5 rps 34 32 36
6 BURN AIR @20kW Fan speed at power level 6 rps 38 36 40
7 TESTING AIR Fan speed for testing rps 42 38 50
8 IGNITION AIR Fan speed during ignition cycle rps 25 20 35
9 BURN END AIR Fan speed durinf end blow cycle rps 20 10 30
10 HOLD FLAME AIR Fan speed during hold flame cycle rps 10 7 14
11 HOLD FLAME ON In case of Hold flame is set on AUTO, 
flame holding activated after 2 waiting 
session, both less then 15 min.
min 15 5 30
12 HOLD FLAME OFF In case of Hold flame is set on AUTO, 
there is maximum time for flame 
holding cycle.
min 60 30 90
13 MIN POWER Minimum power level kW 12 10 20
14 MAX POWER Maximum power level kW 18 10 20
15 AUTO POWER UP min 60 30 120
16 AUTO POWER 
DOWN
min 30 15 45
21 PELLET NORMAL Internal feeder production g/rot 33 28 38
22 PELLET LIGHT Internal feeder production g/rot 31 28 38
23 PELLET HEAVY Internal feeder production g/rot 35 28 38
24 LOADING FEED Feeder turns during loading cycle rot 21 20 24
25 LOADING 2 FEED Feeder turns during second loading 
cycle
rot 3 1 8
26 BURN END FEED rot 15 10 20
30 SMOKEFAN ON 0- OFF, 1 - ON 0/1 0 0 1
31 SMOKEFAN 1 Smokegas fan speed for ignition, end 
blow, burn at power level 1 and 2
% 40 0 100
32 SMOKEFAN 2 Smokegas fan speed for burn at power 
level 3 and 4
% 60 0 100
33 SMOKEFAN 3 Smokegas fan speed for burn at power 
level 5 and 6
% 80 0 100
40 PHOTOCELL Photocell sensitivity % 84 50 100
41 PREBURN TIME Preburn cycle lenght s 50 30 100
42 PREBURN CYCLES n 2 1 4
43 OVERHEAT  TEMP  Maximum allowed burner 
temperature
°C
50 20 70
50 ON ERROR RELAY Error output relay contacts (ON - NO 
or OFF -NC)
ON ON/OFF
99 MODEL VERSION Load default settings for chosen 
burner model or change model type
0 20a 20a/30a/50a/ 
100a
Refilling fuel
The fuel storage must be refilled before it runs empty. Fuel can be added at any time during the 
operation.  To add fuel, simply pour a new bag of pellets into your fuel storage.  
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PV 20a
If the storage runs empty before new fuel is added, the external auger must be loaded again as 
described in chapter Starting. Failing to do so will result ‘No Pellets’ due to fuel loading timeout.
Maintenance
Pellet burner PV 20a requires systematic maintenance. The maintenance period depends on the 
quality of the pellets and heating intensity. The average maintenance period is 1 week. The burner 
needs cleaning when the ash layer on the grate is thicker than 1.5-2 cm. As even high quality pellets 
contain 0.3-0.5% ash, then the burning grate must be cleaned at least once a week. Depending on 
the quality of the pellets, it might be necessary to clean the burner more frequently. 
To clean the burner:
1. Turn off the burner by turning the thermostat to 0. 
2. Let the burner cool down for at least 1 hour.
3. Open the boiler's door to gain access to burning chamber
4. Remove the grate and clean it from any residue. Make sure all holes on the plate are clean.
5. Remove ash from burning chamber.
6. Clean the boiler. The frequency of cleaning the boiler depends on the type of the boiler and 
heating intensity. For more information about cleaning the boiler, please see boiler's user 
manual. 
7. Put back the grate. Make sure the stopper of grate is touching the burning camber from 
inside. Misaligned base plate will change the air flow and reduce burning efficiency.
8. Close the boiler's door to finish the maintenance and turn the thermostat to desired 
temperature.
NB! The burner grate must be checked and cleaned once a week. This assures trouble-free and 
effective operation of the burner.
The connection between the boiler and chimney must be completely tight.  All cleaning and 
maintenance openings must be closed with covers.
Feed screw motor
The condition of the feeding screw motor is crucial for safety. Therefore the motor must be replaced 
after every 2000 working hours or after 40-50 tons of pellets are burned or when the burner gives 
warning.  Burnered pellets amount (in kg) is accessible from info-menu.
Battery
Battery must be replaced when the burner gives warning message or after 5 years. As the battery is 
also safety device, burner monitors the state of battery and blocks next work cycle if battery voltage 
is not within limits.
 
Fan
The air in boiler room contains dust that can deposit on fan bearings. The best cure is to keep boiler 
room as clean as possible. Otherwise the fan bearings can get stuck after several years of working 
and must be replaced.
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PV 20a
Resetting safety thermostat
In case of overheating the burner flashes yellow indicator and displays message OVERHEAT. The 
safety thermostat must be reset manually. Thermostat is located on the horizontal tube of inner 
auger.
1. Make sure the burner has cooled down and disconnected from power supply.
2. Remove the cover by loosening 4 screws (2 on both sides)
3. Press small button on thermostat.
4. Connect power supply
5. Press OK for 5s
6. If indicator keeps flashing, you need to replace the thermostat.
 
 

Figure 11: Resetting the 
safety thermostat

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PV 20a
Working principle
Testing
Before every startup the burner tests itself. At testing time fan is turned on at maximum power. If its 
speed doesn´t reach 30 rps, “fan error”will occure on display.  Battery loading is turned off and 
feeder is turned on. If battery voltage is lower then 12V, “Battery low” error will occure. By testing 
the feeder has to make 1 full turn in 8 seconds, if it fails to do it, “feeder error” will occure.
Loading
In the loading cycle, internal feeder loads correct amount of fuel into burning chamber needed for 
ignition. Loaded fuel amount is measured by counting internal feeder rotations. Loading is correctly 
ended when feeder has made 22 rotations. Internal feeder working depends on fuel level sensor:
• If level sensor recognizes fuel in burner for more than 1s,  the feeder is started
• If feeder makes 1.5 rotations without fuel in burner then the feeder stops
External auger is holding permanent fuel level in the feeder tube all loading time depending on level 
sensor: 
• If level sensor does not recognize fuel in burner more than 1s, the auger is started.
• If level sensor recognizes fuel in burner more than 5s, the auger is stopped.
Maximum loading time is limited with 5 minutes in normal working conditions and 20 minutes after 
manual start.
Igniter is preheated in the end of loading cycle. When internal auger has made 10 rotations (full load 
rotations* - 12) the igniter is turned on for preheating. If the igniter is turned on more than 1 minute 
at loading time, the igniter will be turned off.
• If level sensor recognizes fuel in burner for more than 1s,  the feeder is started
• If feeder makes 1.5 rotations without fuel in burner then the feeder stops
Igniting
In ignition state the igniter is heated up and fan blows hot air through loaded pellets and ignites 
them.
Igniter is turned off after every 50 seconds to avoid overheating it, and turned on again after 20s .
Preburn
The purpose of preburn state is to fully ignite the pellets. No fuel is added at preburn. Fan works at 
the same speed as in ignition. 
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PV 20a
Burning
The running position of the burner. Fuel is periodically added and fan is keeping speed according to 
air table. Burning state lasts until boiler thermostat is switched off.
Auger control
External auger is holding permanent fuel level in the feeder tube during Burning state. The auger is 
controlled by fuel level sensor in following manner: 
• Auger is started after level sensor does not recognize fuel in burner and internal feeder has 
done 2 half- rotations.
• Auger is stopped when level sensor recognize fuel in burner for more than 1s.
Fuel level detection
Pellet level in vertical feeder tube is detected by fuel level sensor (optical).  Fuel is detected when 
pellets interrupt optical link between sensor pair.
Burner will enter level detection fault condition in following cases:
1. Fuel loading timeout (no signal for specified period of time)
2. Fuel unloading timeout (signal lasts longer than specified period of time)
Output power levels 
Burner has 6 preset output power levels. For every level, program calculates correct fuel amount 
depending of fuel calorific value and burner internal feeder productivity. The feeder productivity for 
normal, light and heavy pellets can be changed from setup menu (par21, par22, par23). For most 
pellets it is 33g per rotation. Calculated amount of fuel is divided into periodic feeding cycles. In 
every cycle internal feeder makes half rotation. If the calculated cycle comes to short (less than 11s) 
then the cycle length is doubled and fuel is fed with by full rotation of feeder. For every power level 
there is different preset fan rotation speed (air table). 
Burner chooses the output level between preset min and max powers. When burning time has been 
more then 60 min, next time burner takes one level up, when burning time has been less then 30 
min, next time burner takes one level down.
Hold flame
The main idea of this state is to reduce the number of igniting cycles. This state can be turned on 
automatically or manually in “hold flame” menu (ON/OFF/AUTO). If set to AUTO, burner goes to 
“hold flame” when the time between two startups is less then 10 minutes for 2 times. When “hold 
flame” lasts more then one hour, automatic mode is turned off and burner goes to “burn end” state. 
In “hold flame” state new fuel is fed after every 127s and fan is working by speed given by par10. 
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PV 20a
End burn
In the end burn state all fuel inside the burning chamber and feeder tube must be burned - no more 
fuel added from external auger. Internal feeder and fan keep on working as in previous states (“hold 
flame” or “burning”). After the feeder has made periodically 15 half-rotations (par26), the feeder 
starts working continiously until 32 half-rotations is made.
End blow
Only the fan keeps on working with speed shown in par9 to burn out all coals. Feeder is turned off. 
This state lasts until no flame is recognized plus one minute.
Table 7 Air table for PV 20a
Power [kW] Fan [rps] Cycle [s]* Feeder [rot]*
10 22 26 ½
12 25 22 ½
14 27 18,5 ½
16 30 16,5 ½
18 34 14,5 ½
20 38 13 ½
*
 - cycle length and feeder rotations are different if feeder production changed in parameters setup 
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PV 20a
Controller board description
Figure 11 Controller board
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PV 20a
Table 8 X1 and X2 connectors
X1 Description X2 Description Ash removal +
1 Igniter 1 Ash removal -
2 Igniter 2 Ash removal +
3 N 3 Battery positive terminal
4 Flue gas fan 4 Battery negative terminal
5 Mains transformer 5 Flame sensor
6 Mains transformer 6 Flame sensor
7 Fan 7 Feed screw - (black)
8 L 8 Feed screw + (red)
9 Thermostat 9 Mains transformer 
10 External auger 10 Mains transformer 
BUT – User interface buttons
CONTR – LCD contrast and viewing angle adjustment
FAN – Internal air fan speed feedback sensor
FDR – Feed screw motor speed feedback sensor
TRS – Fuel level sensor transmitter (black marking)
RSV – Fuel level sensor receiver (white marking)
TEMP1 – Feed screw tube temperature sensor
TEMP2 – Ambient temperature sensor
TEMP3
UART – RS232 interface for external modem (5V TTL). 
Fuses:
Fuse Rating Function
F1 0.5A  quick External auger 
F2 1A quick Fan
F3 0.5A quick Flue gas fan
F4 3A quick Igniter
F5 2A quick Controller and feeder motor 
 
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PV 20a
Problems and solutions
Error states Cause Action
Stopped This is actually not an error condition. 
Burner is turned OFF from menu. 
To turn burner on:
- hold down OK button at least 3s
OR
- change row BURNER from OFF to ON in 
setup menu
No pellets Maximum loading time is reached (5 or 20 
minutes) and not enough fuel from external 
auger for ignition is loaded
- check fuel in storage
- check auger and auger connection to 
burner
- check the level sensors, clean them
Fuel level is not detected in 4 minutes at 
burning time
No flame Flame is disappeared at preburning time
Flame is disappeared at burning time
- check the level sensors, clean them
- check photocell, clean it
Flame is not disappeared in end blow state
Overheat Burner internal temperature is reached over 
set-point as fixed in setup menu. Possibly 
back-burning is happened
- check burner temp. from INFO menu
- check temp sensor connection
- check burning chamber and clean it
- check the chimney and under pressure 
(draught) in the boiler 
- check the internal feeder screw 
connection and rotation
Ignition error Flame is not detected at ignition time  - check igniter and igniter fuse
- check photocell
Level error Fuel level in the burner has not disappeared 
at burning time
- Check the level sensors, clean them
Feeder error Feeder has not made any rotations in 8 
seconds at its running time
- check feeder sensor connection
- check magnet on the feeder shaft
- check feeder screw connection
- feeder can be blocked 
Feeder motor current is reached 0,75A 
permanently in 0,2 second time
Fan error Fan has not reached 40 rps in 7 seconds at 
testing time with full power
- check fan sensor connection
- check fan power connections
- check magnet on the fan shaft 
- check fan bearings and rotation 
Fan has not reached needed speed at 
burning time in 20 sec.
Battery low Battery voltage is less than 12V with load 
(working feeder)
- If there was a power failure then just wait 
when it is charged
- replace the battery
No power No network power - check power connector, cables
- check safety thermostat
- check burner for backburn
Safety thermostat has turned off the 
power - backburn
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PV 20a
Warranty
Warranty object is pellet burner PV 20a and auger PA1500 or PA 2000.
Producer gives 2 years warranty from the date of sale for the burner and auger. Exeption is ignition 
element, for this item warranty is 1 year. 
Warranty does  not cover  defects caused by  an accident, misuse, abuse, improper installation or 
operation, lack of reasonable care, unauthorized medication, loss of parts, tampering, attempted 
repair by a not authorized person, power supply errors or using poor quality fuel.
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PV 20a
WARRANTY SHEET
Burner type PV 20a
Serial number ............................
Date of sale ....   / .........  / .......
Customers contact details ..........................................
..........................................
..........................................
Installators name and signature ...........................................
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
WARRANTY SHEET
Burner type PV 20a
Serial number ........................
Date of sale ..../ ........./ .......
Customers contact details ..........................................
..........................................
..........................................
Installators name and signature ...........................................
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