Ariterm KMP Uno Instruction Manual

INSTALLATION and
MAINTENANCE
UNO

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 2/28
Content
To note before installation..................................................2
Design and function...........................................................2
Delivery details...................................................................3
Dimensions and technical data...........................................4
Installation.........................................................................5
Boiler house and chimney ..................................................6
Pipe connection .................................................................7
Electrical installation....................................................... 8-9
Wiring diagrams ........................................................ 10-12
Feeder and hopper...........................................................13
Operation start ................................................................14
Burner settings ................................................................15
Accumulator tank ............................................................16
Maintenance.............................................................. 17-18
Troubleshooting and repair ..............................................19
Exploded view stoker .......................................................20
Warranty .........................................................................21
Installation cetificate .................................................. 22-23
Design and function
The UNO design with vertical flue gas tubes is simple and efficient. In spite of the
small dimensions the boiler can produce up to 20 kW heating effect with an
efficiency of approx. 90%.
The integrated battery of copper gives a large quantity of hot water without risk of
legionella bacteria.
The boiler is equipped with a silent compressor that stores pressure air in a tank
under the upper panel. The pressure air is released through a nozzle, which cleans
the burner pipe.
The tubes are automatically cleaned by a pneumatic cylinder, which lifts and drops
the turbulators each time the burner stops, or at least each 3rd hour. An ash box of
stainless steel is placed in the ash space under the combustion chamber.
The control panel is equipped with a thermometer
for the boiler temperature, a hydrometer for the water pressure and a thermostat
knob to set the boiler water temperature during electrial operation.
The heating cartridge can also be disconnected by the switch on the panel.
Important
• Check that the boiler and the heating system are filled with water and ventilated
before initiating combustion.
• Installation is to be carried out by authorizied heating and electrial technicians only.
• Burner operation: Set the thermostat to switch on the heating cartridge in case
of unexpected burner break-down.
• The threaded pipe, included in the delivery, shall be mounted on the return side
of the shunt valve.
• The boiler shall be electrically connected by an all-pole switch with min. 3 mm
breaker gap.

6
5
3
4
2
1
7
8
9
10
11
12
13
14
15
PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 3/28
Boiler parts
1. Burner door
2. Heating cartridge
3. Tap water copper battery
4. Flue gas channel
5. Control panel
6. Soot door
7. Shunt valve
8. Return (not shown on the picture)
9. Hot water/expansion
10. Large ash box
11. Compressor with tank
12. Automatic tube cleaning
13. Automatic burner cleaning
14. Adjustable feet
15. Drainange valve
The delivery includes:
• Tapwaterexchangerofcopperpipes
• 4-wayshuntwithclampedconnections
• 4pcs.feetwithcounternuts
• 1pc.drainagevalve
• 1pc.installationandmaintenancemanual
• 2pcs.hoseclamps
• 1mpellethose
• 1pc.hoseadapter
• 1pc.stopplateforburner
• 1pc.angleduegaspipewithsootdoor
• Integratedheatingcartridge6or9kW*
• 3pcs.transformer(onlyfor9kW)
*For9kWacurrentlimiterwith2hoursdelayatpowerfailureisincluded.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 4/28
Dimensions and technical data
Flue gas temp. at 20 kW...............................approx. 200°C
Flue gas flow at 20 kW ............................ approx. 0,01 kg/s
Chimney diameter ........................................110 - 140 mm
Water resistance ......................................9mbar•0,5kg/s
 35mbar•1,0kg/s
Environment & efficiency class ............................3 (highest)
Fuel ..................................................... wood pellets class 1
Output, burner ..................................................10 - 20 kW
Electrical efficiency...............................................6 or 9 kW
Water volume, boiler ............................................... 180 lit.
Tap water volume ........................................................ 3 lit.
Weight ........................................................approx. 180 kg
Efficiency ........................................................approx. 90%
Max. working temperature ......................................... 95°C
Max. working pressure.............................................2,5 bar
Draught requirement .............................. 15 Pa (0,15 mbar)
Return temperature .................................................> 55°C

1c. 1d.
2a. 2b.
3a. 3b.
4a.
PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 5/28
Installation
The panel plates can be removed to avoid damage, e.g. when transporting the
boiler. Follow the steps described below after having removed the packing material.
1. Remove the burner
a) Open the front doors by pushing the upper edge and then pull them straight out.
b) Loosen the connecting socket on the left side of the burner.
c) Loosen the socket at the left side above the burner.
d) Loosen the silver coloured hose from the connection above the burner by
pushing the bottom edge of the connection nipple upwards and then pull the
hose downwards.
e) Pull the levers outwards and remove the door with the burner.
2. Remove the top plate
a) Four screws at the rear edge.
b) Two screws at the front/bottom edge; accessable behind the front doors.
c) Lift the top plate.
3. Loosen the side plates
a) Two screws; one on each side above the front door hinges
b) Two screws at the bottom edge of the side panels.
NOTE!
To remove the side panels, the front panel has to be removed as described below
4. Remove the front panel inside the front doors
a) Two screws at each upper corner.
b) The front panel is free to lift up a few millimeters so that the bottom notches
come out of the rails in the side panels.
c) Pull the bottom edge of the front panel forwards. Bend the panel to allow the
edges to pass the hinges.
d) The side panels can now be lifted off.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 6/28
Boiler house and Chimney
There are national regulations, e.g. the Swedish Building Regulations, that give
detailed directives about the performance of the boiler house, installation of
boiler in a boiler house, flue channel design etc. The plumber and the chimney
sweep can give the required information. The boiler house must for instance be
well ventilated and provided with a direct air inlet.
The boiler shall be placed on an even and stable concrete base.
The boiler is connected to the chimney/flue gas channel by the supplied turnable
flue gas pipe, preferrably horizontal. The flue gas channel may never be directed
downwards. The chimney shall be inspected before the installation. If there is any
doubt about the chimney design or its condition, the local chimney sweep has to be
contacted.
There must be an inlet air valve with min. 2 dm² area in the boiler house.
An outlet air fan may not be installed in the boiler house.
The UNO boiler’s combustion chamber and flue gas channels are designed to allow
combustion with a very high efficiency.
Note that the flue gases can condense with too low flue gas temperature, which
can cause freezing damage to the chimney. Rule of thumb: 1 m down in the
chimney the flue gas temperature should be at least 80°C when the burner is in
opertion. The chimney design and insulation determine the flue gas temperature;
a chimney of steel or of brick stone with insert pipe will not be damaged by low flue
gas temperatures provided that condensation, if any, is continously drained from the
lowest level of the chimney.
Install a draught regulator, if not already mounted.
The draught regulator shall be set at 15 Pa under-pressure. Too low under-
pressure can create the problem of overheating of the burner and too high under-
pressure can cause ignition problems and gas flashes.
Install the boiler min. 100 mm from the wall/chimney for easy service.
Also leave room for eventual cleaning access in the chimney.
Draught regulator
Flue gas pipe, angled
Cleaning access

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 7/28
Pipe connection
The pipe connections are to be carried out in accordance with current hot water
regulations. Connection side of inlet and return water pipes to the shunt valve is
determined by the supplied extension pipe’s connection to the valve.
Note that the pipe shall be installed at the return water side!
The boiler is provided with the following inlets and outlets:
• 2pcs.ofsocketsforhotwater/expansion,threaddimensionRp25(1”).
One socket is suitable to use for connection of the expansion chamber, the other
one for connection to the hotwater/radiator circuit. If the shunt valve is to be
used, one socket is plugged.
• Socketforreturnwaterontheboilerrearside,threaddimensionRp25(1”).
To be used for radiator circuit in the basement or if no shunt valve is used.
• Socketforshuntvalve(only6or9kW).Thesuppliedshuntvalveissecured
with an gasket in between and 2 pcs. M8 nuts.
Before mounting the valve, the supplied pipe shall be secured on the return
side of the valve base to separate hot and return water flows.
• Socketfordrainagevalvebetweenburnerdoorandashdoor.
Install the supplied valve.
• CopperpipeØ22fortaphotwater(only6and9kW).Hotwateroutletisfrom
the right hand pipe, looking from the front. Always use a thermostatic mixing
valve and adjust the temperature to max. 55˚C.
Cold water inlet Hot water outletRadiator circuit
Expansion chamber
Hot water / expansion
Cold water inlet
Hot water outlet

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 8/28
Electrical installation
The electrical installation shall be carried out by authorized personnel!
The boiler is equipped with an integrated temperature limiter that protects against
overheating. The temperature limiter switches off the burner as well as the heating
cartridge, if mounted. When the reason for the overheating is found, the tempera-
ture limiter is reset by pushing the switch under the screwable cover.
UNO is available in 2 models, 6 and 9 kW, (see label under the burner door on the
boiler front). For use of the output guard (9 kW model) the supplied current trans-
formers shall be mounted around the inlet wire in the fuse box. They are connected
to terminals S1, S2, S3 and C (common) on the circuit board inside the boiler top
panel.
Load safety guard - function
The boiler registers the total use of current in the house by the current transformers.
Whenthecurrentreachesthelimitvaluessetbytheknob”SÄKRING”(FUSE),half
of the boiler output, 4.5 kW, is disconnected.
The right-hand white knob is to be set at 4.5 kW and the left-hand yellow knob at
the main fuses value.
2 hour barrier - function
After a power failure half of the boiler output is saved in the boiler to avoid stress of
the main supply. The barrier can be disconnected by shortcutting
the the two terminals marked TF. The delay will then be only 20 seconds.
Heating cartridge
Fuse

2a. 2b.
2c. 2d.1a.
PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 9/28
Electrical connection of UNO
1. Remove the top panel
a) Two screws at the front/bottom edge; accessable behind the front doors.
b) Lift up the front edge a few centimetres. Put a suitable tool between the bot-
tom edge of the top panel and the side panels to keep the top panel in open
position.
2. Loosen the electric panel
a) Two screws at the top of each upper corner of the front panel.
b) Two M5-screws hold the electic panel towards the compressor bracket.
c) Two screws on each side above the front door hinges.
d) The electric panel is free to bend down to give access to the terminals.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 10/28
Wiring diagram 0 kW
Feeder
motor
White
MAINS SUPPLY
(lower)
Magnetventiler
L
N
1 5 4 3 2
L N
PE
PE
L N
N J L1 L2 L3
Circiut board
(24)
White
White
17181920 13141516 1112
Light sensor
Grey
Trafo
Brown
Orange White Gn/Y
Blue
Blue
White
Temp limiter
Yellow (31)
C°
Blue
Green
Red
Gn/Y
Grey
Blue (25)
4
Black (21)
67810 9 5
080311
321
Brown
Fan
Ign. element
BURNER
WIRING DIAGRAM 0 kW
Purple (29)
15
1P
Grey (28)
Brown
Gn/Y (25)
Kompressor
Blue (30)
Yellow (32)
(upper)
Temp.sensor
Blue (26)
Time relay
Brown (25)
A2 A1
18
White (2)
Orange (27)
Blue (5)
Gn/Y (4)
Blue
Gn/Y
Gn/Y(3)
Grey (1)
Temperature limiter
C°
16

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 11/28
Wiring diagram 6 kW
Feeder
motor
White
MAINS SUPPLY
(lower)
Magnetventiler
L
N
1 5 4 3 2
L N
PE
PE
L N
N J L1 L2 L3
Circiut board
(24)
White
White
17181920 13141516 1112
Light sensor
Grey
Trafo
Brown
Orange White Gn/Y
Blue
Blue
White
Temp limiter
Yellow (31)
C°
Blue
Green
Red
Gn/Y
Grey
Blue (25)
4
Black (21)
67810 9 5
080311
321
Brown
Fan
Ign. element
BURNER
WIRING DIAGRAM 6 kW
Purple (29)
15
Contactor 1
A2
1P
Grey (28)
Brown
Gn/Y (25)
Kompressor
Blue (30)
Yellow (32)
(upper)
Temp.sensor
White (10)
Blue (26)
Time relay
Brown (25)
A2 A1
18
White (2)
Orange (27)
Blue (5)
Gn/Y (4)
Blue
Gn/Y
Gn/Y(3)
Switch
Blue (12)
Grey (1)
Temperature limiter
C°
Bl (11)
Brown (6) Brown (6) Brown (6)
5 3
1
A1
16
Black (9) Black (9)
Thermostat
Dark blue (8) Black (7) Black (7)
C°
212 31
4
6
32 22
Heating cartridge

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 12/28
Wiring diagram 9 kW
Feeder
motor
White
MAINS SUPPLY
(lower)
Magnetventiler
L
N
1 5 4 3 2
L N
PE
PE
L N
N J L1 L2 L3
Circiut board
(24)
White
White
17181920 13141516 1112
Light sensor
Grey
Trafo
Brown
Orange White Gn/Y
Blue
Blue
White
Temp limiter
Yellow (31)
C°
Blue
Green
Red
Gn/Y
Grey
Blue (25)
4
Black (21)
67810 9 5
080311
321
Brown
Fan
Ign. element
BURNER
Black (11)
Contactor 1
WIRING DIAGRAM 9 kW
Purple (29)
A2
15
1P
Grey (28)
Brown
Gn/Y (25)
Kompressor
Blue (30)
Yellow (32)
(upper)
Temp.sensor
White (10)
Blue (26)
Time relay
Brown (25)
A2 A1
18
White (2)
Orange (27)
Red (15)
Blue (5)
Gn/Y (4)
Blue
Gn/Y
Gn/Y(3)
Grey (1)
Fuse 8 AT
Switch
Blue (12)
Grey (1)
Temperature limiter
C°
Brown (6)
Brown (6)
Brown (6)
3
1
5
1211
Power limiter OX1T
Red (18)
2
1
16
4
3
Blue (16)
Red (17)
Contactor 2
A1 A2A1
Brown (14)
Brown (14)
Black (9) Black (9)
Termostat
Grey (19)
Blue (20)
Brown (13)
65
43
21
Black (7)
Brown (13)
Black (7)
Dark blue (8)
C°
6
21
431
2
32 22
Heating cartridge

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 13/28
Feeder and hopper
Feeder screw
Wether a standard screw or another screw model is used, it is important to follow
the instructions for the actual screw.
Pellet hopper
The hopper must be designed to avoid too much dust and shavings in the boiler
house when refilling the pellets. It must be possible to remove the feeder screw for
cleaning with-out emptying the hopper.
If the screw length is too short, it is recommended to arrange an intermediate
hopper to which a feeder screw with standard length can be connected.
Fuel quality
The burner can work with most sizes of clean wood pellets. Pellets with 6 or 8 mm
diametre are recommended. Larger pellets do not give the same good combustion
result.
Fine pellets with few fine fractions (shavings) and even quality always give better
combustion and less operational trouble. The pellet quality should therefore comply
standard CEN/TS 14961.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 14/28
Operation start
To fill the system
Before starting up, a closed system must be filled up to a water pressure of 0.1 bar
higher than the static pressure = the height difference between the highest radiator
and the expansion chamber.
Example:
Highest level 5 m = 0.5 bar + 0.1 = 0.6, which gives a manometer pressure of 0.6
bar at cold boiler.
Systems with open expansion chambers are filled until water flows out the overflow
pipe.
Pellet burner
Burner settings and maintenance are described in detail on the following pages.
Flue gas temperature is choosen by means of the burner output with regard to
chimney’s design and condition.
As a start value, set the fuel feeding (pot 1) so that the screw turns approx. a half
revolution(KMPstandardscrew1.7or2.3m).Thefan(pot3)canbesetbetween
150 and 180 VAC.
Switch
The UNO boilers 6 and 9 kW are equipped with a switch on the switchboard panel.
Inposition”1”theheatingcartridgeispoweredandcontrolledbythethermostat,
inposition”0”theheatingcartridgeisswitchedoff.
The pellet burner is switched on and off by the switch on the burner’s panel behind
thefrontdoors.Theburnerstartsandstopsautomaticallyinposition”1”.
The output is also automatically controlled in this position.
Thermostats
It is recommended to adjust the burner thermostat to switch off at a boiler
temperature of 80 - 85˚C. The electrical thermostat is set 20 - 30˚C lower to make
electrial heating start in case of an unintential burner breakdown but not to switch
on at normal operation.

1
2
3
4
5
PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 15/28
Burner settings
First start
The burner is not factory adjusted. It must be adjusted at the first start. The burner
should normally be used with two output positions; high and low, but the low out-
put position can be disabled by an easy adjustment on the circuit board. If the flue
gas temperature is too low, the burner should only be operating in the high output
position to avoid condensation problems in the chimney.
Exception: If the chimney is provided with an insert tube, some condensation can be
accepted; ask your chimney sweep for advice.
To set air and fuel quantities
1. Fill the feeder screw with pellets before connecting it to the burner. Connect
the burner cable to the feeder screw motor. Let the motor run a few minutes
after the feeder screw has been filled to ensure that it is completely full.
2. Set the starting dose (pellet quantity for ignition) by pot 2, turn clockwise to
increase the quantity. 0.3 to 0.4 litres is a moderate dose.
A change of the starting dose will not be activated until next start.
3. To set the fuel quantity (output) for operation:
Start the burner, wait 5 minutes after the start of the operational phase (green
diode shows fixed beam), adjust pot 1 to the correct flue gas temperature.
The screw conveyor normally makes less than half a revolution during each
feedingcycle(KMPstandardscrew).
Air settings
For optimal setting, a flue gas gauge should be used (ask your installation technician).
Correct setting of the air quantity is important for economic combustion.
Greyorblackchimneysmokeindicatestoolittleair.Whitesmokemostlyconsistsof
steam, which is normal during certain weather conditions.
To set low output position
Wait until the burner is in the low output position (yellow light), set the air quantity
by pot 4 in the same way as setting the high output position. The output (the feed-
ing) will automatically be 80 % of the high output position.
To switch off the low output position
Remove the bracket on the right-hand side
of the circit board.
Fig 4.
Potentiometers for adjustment.
Pot 1: Fuel quantity, opertional phase.
Pot 2: Fuel quantity, starting dose.
Pot 3: Air quantity, high output position.
Pot 4: Air quantity, low output position
Pot 5: Boiler temperature
Fig 3.
Bridge for high and low output.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 16/28
ACCUMULATOR
Heating to an accumulator tank
It might be advantageous to connect an accumulator tank to the boiler as this often
prolongs the burner’s operational times and improves the annual average efficiency.
With an UNO boiler it will not be economical to install a new accumulator tank as
the profit will probably not pay the investment thanks to the boiler’s extremely high
efficiency. An accumulator tank is, however, needed if the boiler is to be combined
with a solar energy system.
Installation of boiler with accumulator tank
If water heater or shunt valve is placed in the boiler, the burner will always be
controlled by the boiler temperature. The temperature sensor that is mounted in the
boiler will then be used. If the boiler and the accumulator tank have direct circula-
tion (the boiler heats the tank, which delivers hot water and warm tap water), the
boiler temperature should not be below 60˚C when the burner starts to avoid con-
densation and corrosion in the boiler. A thermostat controlled loading circuit should
therefore always be included in the system, see sketch below.
When water heater and shunt valve are placed in the accumualtor tank, the temper-
ature sensor can alternatively be placed on the tank to achieve longer operational
time as there will be less stops and starts.
Tank-mounted temperature sensor
If the burner’s temperature sensor will be placed on the tank there must be a load-
ing circuit with sufficient capacity to cool down the boiler. The boiler temperature
may not exceed 95˚C before the tank has reached the set temperature
(80˚C is recommended) and the burner is switched off.
The temperature sensor may not be placed to low on the tank as it then will be
more difficult for the loading circuit to cool down the boiler sufficiently.
If there is some doubt, mount the temperature sensor on the tank and test as
follows: heat the boiler and the tank until the boiler temperature reaches 95˚C,
check the temperature in the tank. This simple test will give an idea of where the
sensor should be placed and of the suitability to place it on the tank.
A specific accumulator control device is available as option.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 17/28
Maintenance
Cleaning of the boiler
With correct settings the boiler operatation will almost be sootfree. However, pel-
let combustion always creates flying ash that is transported by the flue gases and
fastens on the convection parts. The ash is automatically removed, which keeps the
burner and the tubes quite clean. The combustion chamber and the flue gas tubes
therefore require a minimum of cleaning.
It is recommended to clean the boiler in connection with the annual fire-protection
inspection. Before cleaning, switch off the main current, then dismount the burner,
the ash chamber door and the soot door. Use a brush, soot rake or vacuum-cleaner
with ash separator to remove any deposits of soot.
• Emptytheashboxbeforeitislledup.Emptyingintervalsvarydependingonthe
burner’s operational time and the ash content of the fuel. Check that there is no
ash left in the ash chamber before putting the ash box back.
• Afewtimeayearthesootchamberontopoftheboilershallbecleaned.Liftthe
cover and use a vacuum-cleaner with separator. Also check that the turbulators
run freely in the tubes by pulling the rocker straight upwards and then drop it
down. Put the cover back in the proper position.
• Onceayeartheburnershouldbecleanedbetweentheinnerandoutertubes.
• Thepellethoppershouldbetotallyemptiedandcleanedfromshavingsoncea
year.

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 18/28
Resetting cut-out thermostat
1. Disconnect the three cords from the burner.
2. Unscrew the two screws from the cut-out thermostat protective cover,
remove cover .
3. Push botton on cut-out thermostat until it clicks.
4. Reassemble the protective cover.
NOTE! Maintenance work as described below shall be carried out by
experienced personnel.
Replacement of ignition element
1. Dismount the burner housing by loosening the three brass nuts and pull the
housing backwards.
2. Loosen the ignition element cables from their connections (2 pcs. grey).
3. Loosen the four screws holding the outer tube towards the rear housing.
Separate the burner carefully.
4. Loosen the screws (2 pcs.) on the bottom side of the burner, which hold the
ignition unit.
5. Loosen the screw that holds the element and pull it out its reducer.
6. Mount and secure the new element.
7. Remount in reverse order.
Replacement of flame guard
1. Loosen the three burner cables.
2. Dismount the burner housing by loosening the three brass nuts och pull the
housing backwards.
3. Loosen the white cables on the terminal no. 17 and no. 18 and pull the sensor
out of the hole on the right-hand side of the fan.
4. Mount the new sensor; push until the spring fastens into the hole. Make sure
the flame guard is perpendicular to the plate. Connect the cables to the termi-
nal and remount the burner housing.
Dismounting the screw conveyor
1. Loosen the cable to the screw motor.
2. Dismount the hose between the screw conveyor and the burner.
3. Loosen the hexagon screws between the motor and the upper end of the tube,
pull the motor straight out from the tube.
4. Loosen the two M8 screws to the feeder screw bearing. The feeder can now be
pulled straight out.
5. Remount in reverse order. Note that the hexagon screw must fit into the motor
shaft notch.
NOTE!
In case of iginition failure; do not open the fireplace door until the combus-
tion chamber is well ventilated!
Fig. 5 Ignition element

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 19/28
The burner stops, red
lamp is illuminated
• Pellethopperempty.
• Pellethaveformedavalveat
feeder screw inlet.
• Pelletfeederblockedby
foreign object.
• Burnerlledwithpelletsin
the inner combustion area.
Fill pellets...
Shake hopper to get pellets flowing
down. Bottom of hopper must be
inclined at least 45°
Knockhardonfeedertube.Ifthis
doesn’t help, remove and drain
feeder. If necessary, dismantle
feeder (se section Dismantling the
screw feeder)
1. Clear out all pellets and restart.
2. In case of starting failure:
check ignition element by
starting with feeder discon-
nected and stoker removed
from boiler (yellow cover on).
Normally heating element will
glow 1 minute after finished start
dose. If no glow, first check all
wires and connections, then the
glow coil (120 - 145 Ohms).
If alright, change the ignition
controller.
Burner doesn't ignite,
remaining pellets in
stoker not scorched.
•Faultyignitionelement. See under Replacement of ignition
element.
Burner stops now and
then without apparent
cause
• Incorrectsettings,ortolargeor
fluctuating chimney draught,
or faulty or incorrect pellets
feeder system.
Contact authorized dealer.
Burner ignites
but stops.
• Tolargestartdose,orfeeding
to much in full power mode.
• Tomuchashesinthe
stoker.
See chapter Setting air and fuel
levels.
Check the automatic ash removal.
Burner has stopped,
no red light
• Burnerhasbeenoverheated. Clean out ashes from burner and
boiler.
Reset cut-out thermostat on the
feeding shaft.
Troubleshooting and repair
Fault Cause What to do Fault Cause What to do

PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 20/28
/UTERTUBE
)NNERTUBE
2EDUCER
2EARHOUSING
&LAMEDETECTOR
INCLSPRING
$ROPTUBE
/VERHEATINGPROTECTION
2AILFOR
OVERHEATINGPROTECTION "URNERHOUSING
/UTLETSOCKET
)NLETSOCKET
4RANSFORMER
#ONNECTOR
TEMPSENSOR
&AN
)GNITIONELEMENT
INCLATTACHMENT
)GNITIONELEMENT
BRACKET
Exploded view burner