Pelltech PV50b User manual

PV50b pellet burner
User manual
DK9802A2

PV50b pellet burner
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Description
Specifications
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1Contents
2 Description ............................................................................................................................................ 3
2.1 Specifications................................................................................................................................. 3
3 Installation............................................................................................................................................. 7
3.1 Prerequisites.................................................................................................................................. 7
3.2 Installing burner to the boiler ..................................................................................................... 10
3.2.1 Pellet storage....................................................................................................................... 11
3.2.2 External auger ..................................................................................................................... 12
3.3 Electrical connections.................................................................................................................. 13
3.4 Commissioning ............................................................................................................................ 13
4 Operation and maintenance ............................................................................................................... 14
4.1 User interface.............................................................................................................................. 14
4.1.1 Status messages .................................................................................................................. 16
4.1.2 Info menu ............................................................................................................................ 17
4.2 Starting and stopping .................................................................................................................. 17
4.3 Description of a working cycle .................................................................................................... 17
4.4 Refilling fuel storage.................................................................................................................... 19
4.5 Regular maintenance .................................................................................................................. 19
4.6 Replacing components ................................................................................................................ 19
5 Problem and solutions......................................................................................................................... 22
6 Annex A –Electrical schematic............................................................................................................ 24

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Description
Specifications
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2Description
PV50b is wood pellet burner for domestic and industrial use. Typical setup includes external pellet
storage (1), external auger to transport pellets from storage to burner (2), boiler (3) and PV50b
burner (4) mounted onto the boiler.
Figure 1 Typical installation
PV 50b 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 50b allows it to be used with different boilers: liquid fuel, solid fuel
and universal boilers. The PV 50b 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 hose, temperature sensor and auxiliary
battery for protection against back-burning.
Methods of control of pellet burner –modulating burner
Means of ignition –Hot air element
Without integral fuel hopper
Automatic ash cleaning system
“Hold flame” function
Optional oxygen sensor interface
Optional communications module interface
2.1 Specifications
Parameter
Unit
Value
L total length
mm
560
L1 burner body length
mm
175
L2 burner head length
mm
260
⌀D burner head width
mm
180
⌀D1 burner head neck diameter
mm
90
⌀D2 internal feeder inlet diameter
mm
60
1
2
3
4

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Description
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H total height
mm
275
H1 burner housing height
mm
230
W total width
mm
240
W1 burner head width
mm
168
Mass
kg
17
Supply voltage
VAC
220-240
Power max
W
570
Power average
W
25 - 40
Power at standby
W
7
Noise
dB
52
Emission class1
-
5
Operating temperature
Co
0-60
Nominal heat input
kW
50
Min heat input
kW
20
Main parts of the burner a shown on Figure 3 and listed below.
Figure 2 Dimensions

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Description
Specifications
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Table 1 Main components list
No
Spare part code
Short name
Description
1
Burning chamber
Pellets are burned inside the burning chamber on a
grate.
2
Burner body
The half of the burner that is located outside the
boiler. Incorporates feed screw (internal auger), fans,
controller etc.
3
User interface
LCD screen, LED indicators and navigation buttons to
show burner status and change settings.
4
Internal auger inlet
External fuel supply line (hose) is connected here.
5
Internal auger feed
screw
Transports pellets from inlet to the burning chamber.
Internal auger is switched by controller board.
6
Burning chamber
back wall
Replaceable stainless steel wall that separates hot
and cold surfaces and reduces heat transfer through
boiler door.
7
Grates (set of two)
Moving grates, where burning takes place. Air is
supplied through holes in grates
8
Igniter
Electric heating element to heat up air and ignite
pellets in burning chamber.
9
Boiler connector
Connector for power supply, flue gas fan, thermostat
10
Power supply
AC-DC converter to supply internal controller board,
feeder motor, fans and sensors.
11
Temperature
sensor
Internal auger temperature sensor to detect back
burning before safety thermostat cuts mains power.
12
Battery
Backup battery to enable safe shut down in case of
mains power interruption.
13
Feeder motor
Internal auger motor with rotation feedback to
transport controlled amount of pellets to burning
chamber.
14
Primary fan
15
External auger
connector
Quick connector to connect external auger.
16
Secondary fan
17
Controller board
Electronic control unit to turn on/off burner, switch
external auger, regulate combustion air supply etc.
18
Fuel level sensor
Optical sensor to detect the presence of pellets in
internal auger inlet. Normally, external auger is
switched on, if no pellets detected.
19
Burning chamber
cover
Replaceable cover to increase combustion quality

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Description
Specifications
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Figure 3 Burner main parts
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17
18
11
19

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Installation
Prerequisites
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3Installation
3.1 Prerequisites
Following tools are needed 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 fixing the boiler to the flange
Warning! If flue gas temperature at the top of the chimney is less than 80Co, 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
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) draught 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.
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.
Pellet burners need regular cleaning and therefore boiler construction must allow the door to be opened
without removing the burner. The minimum boiler opening radius 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.

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Installation
Prerequisites
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Figure 4 Hinge position and boiler opening size
considerations
Figure 5 Double hinges
Boiler firebox length L (Figure 6) should be at least 2,5 x the length of the burning chamber. For PV 50b,
minimum of 640mm is acceptable (leaving L1 approx. 380mm). The height under the burner (H1) should
be enough for about 100mm of ash.
Minimum dimensions L and H for PV 50b: L≥640mm; H≥400mm.
Figure 6 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 2 are only valid with supplied flanges.

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Installation
Prerequisites
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Table 2 Mounting holes for boiler door
Dimension
Unit
Value
⌀D hole for burning chamber neck
mm
90
⌀D1 flange bolt ring diameter
mm
130..150
⌀D2bolt holes
mm
8..9
Figure 7 Mounting holes with supplied flanges for boiler door

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Installation
Installing burner to the boiler
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3.2 Installing burner to the boiler
Figure 8
1) Remove burning chamber from the burner
body by loosening burning chamber bracket
bolts (1). There is no need to completely remove
brackets or bolts.
Figure 9
2) Remove upper grate (2) and then the lower
grate (3) from the burning chamber.
3) Remove burning by pulling it, while pushing
linear actuator rod (4) upwards through the
burning chamber back wall.
1
1
2
3
4

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Installation
Installing burner to the boiler
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4) Fix the flange (4) of the burner to the door of
the boiler (5). Make sure that the opening of the
flange and the opening of the boiler door are
aligned.
5) Fix the burning chamber (6). For that you need
to put a ceramic seal (7) on the narrower side of
the burning chamber and then put the chamber
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 to the flange.
6) Connect the body of the burner to the burning
chamber like it was done before disassembling in
step 1.
Figure 11 Igniter correct position
7) Make sure, when looking through the burning
chamber, the igniter end tip is at the same level
with the back 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 back wall.
3.2.1 Pellet storage
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° (refer to Figure 12).
It is advisable to use a container that can be closed with a cover.
4
5
6
7
Figure 10

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Installation
Installing burner to the boiler
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3.2.2 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 upper side of auger (with motor) must
be fixed to the storage or to some other object nearby (with delivered chain).
Figure 12 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 to 70 cm and horizontal displacement 10 to 20 cm (typical auger angle 30o..45o). External auger
cannot be installed in position with angle greater than 45o. The hose must be in angle of 50oor more to
ensure free falling of the fuel.
Auger cable must be connected to the left of the burner. Make sure the connector is fully inserted into
socket.
Figure 12 External auger installation
45o max
30 .. 70 cm
10 .. 20 cm

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Installation
Electrical connections
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3.3 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.
Auger motor wiring connection for the 3 contact plug
Flue gas fan wiring connection for the 7 contact plug.
Tt –Boiler temperature thermostat.
Caution! All electrical connections of the burner must be made by a qualified professional.
3.4 Commissioning
Before starting the burner for the first time, please check that:
Burner body and burning chamber are securely connected by brackets
The grates are installed in burning chamber
Igniter can be seen from burning chamber and it is not stuck behind back wall of the burning
chamber (Figure 11).
Boiler thermostat is connected to the burner (Figure 13).
External auger is connected to burner and auger position is according to requirements in Figure
12.
Boiler is connected to chimney, dampers are opened and there is enough draught (4-6Pa
minimum).
No additional air valves are opened in boiler. All combustion air must come from the burner.
Tt
Figure 13 Electrical wiring

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Operation and maintenance
User interface
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4Operation and maintenance
4.1 User interface
User interface allows starting and stopping, changing parameters and view statistics about burning
process. Main parts of the interface are listed below
1. Flame indicator. Yellow LED to indicate if
flame detector has detected flame in burning
camber.
2. LCD screen
3. Fuel indicator. Green LED to indicate if there
are pellets in internal auger inlet.
4. Navigation buttons to change parameters
and control the burner.
Figure 14 User interface
Up and down arrow keys enable to move up and down in menus, also change parameter value in editing
mode. OK and back arrows have different actions depending on the context.
Table 3 Buttons
Button
Push time
Action
OK
less than 3s
Enter submenu
Confirm settings (when blinking)
OK
more than 3s in INFO menu
Pellet counter reset
OK
more than 3s not in INFO menu
Error status reset
OK
more than 3s in NO POWER state
Switch off the burner (cut battery)

less than 3s
Move back from menu
Discard changes in setting (when blinking)
OK + 
more than 3s
Burner reset
By default, the status screen is displayed with time
counter. 1m12 reads as 1 minute and 12 seconds
and 3h24 means 3 hours and 24 minutes.
Stopped 1m 12
2
1
3
4

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Operation and maintenance
User interface
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Main menu in Figure 1Figure 15 can be accessed by pressing OK button.
Figure 15 Menu layout

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Operation and maintenance
User interface
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4.1.1 Status messages
During operation, the burner displays several status messages. Short explanation is given below.
Table 4 Burner status messages
Status
Message
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, and 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

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Operation and maintenance
Starting and stopping
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4.1.2 Info menu
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 pressure sensor is connected, draught is shown.
4.2 Starting and stopping
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, external
auger needs to be filled with pellets. It can take up to 20 minutes.
To stop the burner, there are two options:
Turn boiler thermostat to lowest point.
-or-
Go to menu and change ‘Burner’ from ON to OFF
In both cases, it takes some time before all pellets inside the burner are burnt. Status changes
BURNINGBURN ENDEND BLOWWAITING or STOPPED. It can take more than 20minutes to
complete.
Warning! Never turn off a working burner from the main switch of the boiler (i.e. by cutting the mains
supply). Use the thermostat switch for that purpose. In order to stop safely, let the burner burn empty.
4.3 Description of a working cycle
When the burner is switched on for the first time, it displays STOPPED.
After turning on the burner (chapter 4.2), the burner enters into WAITING status. Now the burner is
ready to start if boiler thermostat signal is received (electrical connections chapter 3.3).

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Operation and maintenance
Refilling fuel storage
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Burner starts TESTING if boiler thermostat signal is received. Combustion air fans, battery voltage is
tested and measured.
Upon completion of testing, the burner starts CLEANING, during which grates are moved back and forth
do remove the ash.
After cleaning, the burner is ready to load pellets into burning chamber. In LOADING status, external
auger starts to transport pellets into burner. Internal feeder loads pellets into burning chamber. Internal
feeder starts only when there is a signal from level sensor. The signal is needed to ensure that the
internal tube is filled with pellets. This way the amount of pellets entering into burning chamber is
roughly proportional to the number of rotations that internal feeder makes.
IGNITING starts when predetermined amount of pellets is loaded to burning chamber. The amount of
pellets is adjustable in parameters menu. Igniters are switched on first time in loading status to preheat
the ignition system. Igniters are periodically switched on and off to keep them from overheating. It can
take several minutes for the hot air to ignite pellets.
Signal from flame sensor marks the end on igniting and burner enters into PRE-BURN status. The
purpose of this status is to allow build up flame before starting to add more fuel.
Next status, BURNING, is the normal operating state of the burner. Here fuel is periodically added
according to current power level. If enabled from menu, burner can make cleaning cycle after fixed time
intervals. Cleaning during burning is preceded by short HOLD FLAME status to burn the pellets before
dumping ash to boiler.
Burning can be ended by turning burner off from menu or button on user interface, but normally the
burning status ends by receiving boiler thermostat signal. In all three cases, the next status is END BURN.
No more pellets are added anymore, but the combustion air is still kept as in burning status. It allows
remaining pellets to burn. End burn lasts until no flame is detected by flame sensor.
The burning cycle ends by END BLOW status. Here only small amount of air is supplied to completely
burn all embers.
Next status can be waiting again or HOLD FLAME, if it is enabled from menu. Hold flame reduces the
number of ignitions and allows the burner to operate smoothly. Here only minimal pellets and air is
supplied to keep the flame alive.

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Operation and maintenance
Refilling fuel storage
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4.4 Refilling fuel storage
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.
If the storage runs empty before new fuel is added, the external auger must be loaded again by switching
burner OFF and back ON from menu. Failing to do so will result ‘Fuel error’ due to fuel loading timeout.
4.5 Regular maintenance
Following maintenance procedures must be carried out on regular basis
Once a week –ash removal from boiler
Once a year –cleaning of grate power screw
4.6 Replacing components
To open burner lower cover, loosen
burner cover's middle (8) and bottom
(9) screw. Then pull the cover
towards direction shown in picture.
There is no need to remove screws.
8
9

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Operation and maintenance
Replacing components
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In order to remove burner upper
cover, first open burner lower cover.
Then remove upper cover's screws
(10). Pull the cover upwards direction
shown in the picture.
NOTE: it may be necessary to remove
user interface buttons from the
controller board to completely
remove upper cover from the burner.
Igniter
1) Disconnect burner from the power
network.
2) Open burner body.
3) Disconnect igniter wiring from the
control board X1, connector 1 and 2.
4) Loosen igniter fixation screw (11)
using cross-head screwdriver.
5) Remove igniter from the burner
body.
6) Install and connect new igniter vice
versa from removing.
10
10
11