Ariterm PX50 Quick start guide

DIRECTIONS FOR
INSTALLATION AND USE
PX50

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 2/16
Content
Description ........................................................................3
Fitting............................................................................ 3-4
Electric installation .............................................................5
Start and setting ................................................................6
Storage tank......................................................................7
Maintenance................................................................ 7-10
Exploded view..................................................................11
Technical data..................................................................11
Accessories and fittings....................................................11
Warranty .........................................................................12
Installation certificate................................................. 13-15
Description
The KMP stoker is designed to be installed in a boiler and is to be fired with wood-
en pellets. The attached screw feeds pellets from a barrel or similar, alternatively a
separate storage bin that might be filled from the outside, either from a barrel or a
sack or trough a hose from a truck by means of compressed air.
The integrated electronics controls the stoker with a special temperature sensor,
wich is to mounted on the boiler, and starts and stops the stoker. The output is
automatically adjusted with regard to the boiler temperature.
There is a breaker on the control panel for start and stop, and a control screw to
adjust the desired working temperature of the boiler.
Three control lamps indicate that:
1. – current is on (green) (above On/Off switch)
– stoker is in full power mode (green)
– stoker is igniting (green blink)
– stoker is standing by (green slow blink)
2. – stoker is in low power mode (yellow)
3. – shut down (red)
– shut down in full power mode (red) (green)
– shut down in low power mode (red) (yellow)
The stoker is equipped with a microprocessor controlled system that regulates the
combustion. Ignition is made with a heater coil when the boiler temperature is
lower than the temperature chosen on the control panel. The starting procedure is
made automatically in several steps in order to achieve a quick and virtually smoke-
less startup. In case the ignition fails the procedure is repeated once or, if needed,
twice.
When the boiler temperature has increased 2 - 5˚C the output is reduced to half
power, to stop when the desired temperature is reached (80 - 85˚C). After a short
period of cooling down the stoker stops, to automatically restart when the
temperature has decreased about 12 - 17˚C.

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 3/16
Fitting
The PX50 stoker is to be mounted to one of the boiler hatches. The best place is
often where the oil burner normally goes, but if there is not sufficient room for
the ashes, the hatch for the wood can be a good alternative. If the hatch is not
big enough to be opened with the stoker in place, arrangements has to be made
to facilitate an effortless removal and reassembly. One way is to mount screws in
threaded holes from the inside of the hatch, and use wing nuts. The stoker is to be
cleaned from deposits and ashes at least once a week during the cold season.
Note! Contact your local chimney sweeper when installing the stoker
Fitting the stoker
1. Decide where to put the stoker. If the hatch can be opened with
the stoker in situ, this is to be preferred.
Note! The electric supply is to be automatically shut of when the
hatch is opened.
2. Make a 160 mm diameter hole in the hatch. Seal off using glass fibre rope
or a similar high temperature gasket. Fasten the burner,
using the screw on the top of the mounting flange.
Note! The hatchet has to be well insulated.
3. All hatches and valves have to be airtight in order to not allow
undue draught into the boiler.
4. After mounting the stoker and sealing the boiler it’s time for the screw feeder.
Note! When feeding directly to the burner, the standard feeder (maximum
length 2,3 m) is to be used. Preferably it should be hung from the ceiling.
Before connecting feeder and stoker; see section Start och adjustment.
Important!
• The ue valve, if any, must be kept fully open at all times.
• All hatchets and ue pipes must be airtight.
This is particularly important if the chimney is tight or there is a low draught for any
other reason. Otherwise there is a risk of smoke going backwards during startup,
especially if the stoker is not properly adjusted.
Screw feeder
Allways observe the following:
• The feeder inlet opening is not to be less than 100 mm from the bottom
150 mm from the nearest side wall of the storage bin.
• The feeder has to be inclined between 40˚ and 50˚ from horizontal.
• Attach the feeder thoughly to keep it from working its´ way into the storage bin!
Temperature sensor
The temperature sensor is to be placed in a submerged tube, alternatively high up
on the boiler top beneath the insulation. If there is not a suitable fastening point the
sensor can be glued directly to the metal using an epoxi resin. Note that the sensor
has to be attached directly to the metal to ensure a stable and exact temperature
regulation.
Boiler room and safety
There has to be an inlet aperture to allow air being drawn in to the room from the
outside. The free area of the aperture should correspond to the area of the chimney.
A boiler using air for convection must not use air from the room!
It´s important that the room is clean and free from dirt and dust to prevent fire.
Combustable materials shall not be cept at a distance closer than 1,5 meters from
the stoker.
Chemicals are not to be stored in the boiler room, because of fire hazards and
possible damage of the chimney due to acid fumes.
The door to the boiler room must be kept shut!

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 4/16
Pellet storage
The storage is to be designed in a
fashion that the amount of dust
and grain will be minimized when
it is being filled. It must be clad
with a fire proof material, e.g.
sheet metal or plaster panels.
The feeder screw should be re-
movable without having to empty
the storage first.
If the feeder is too short, an
intermediate pellet bin with
an extra standard length
feeder is often the best solu-
tion.
The combustion chamber
Clearance between the top of the stoker and the inside of the combustion chamber
is to be minimum 50 mm, and at least 150 mm in front of the aperture.
An adapter plate with an extenson is optional extra. Minimum clearance beneath
the stoker is depending on the type of boiler, there has to be space for ashes gene–
rated during at least one week of operation.
The Chimney
If the flue gas temperature is too low there is a risk of condensation, wich may
cause seizing or frost erosion of the upper part of the chimney.
Try to attain a flue temperature of minimum 180˚C after the boiler. A more accurate
method is to measure the temperature circa one metre down from the top of the
chimney. If temperature exceeds 80˚C there is little risk of condensation.
If lower temperature, measures have to be taken. Also look for signs of dampness in
the lower parts of the chimney. If so, the flue gas temperature has to be rizen.
If there is only a small amount of moisture in the upper part, installation of a
draught pass might be sufficient. Alternatively the stoker can be run only in full
power mode.
If large amounts of moisture appears, installation of a stainless steel insert tube is
the best solution.
If the draught in the chimney (burner reacently stopped) is graeter than 20 Pa, you
have to install a draught pass. This should be set to 12-15 Pa.
Fig. 1 Example of assembly.
Is the boiler suitable
The KMP stoker can successfully be installed in virtually any boiler on the market.
It´s important that the cumbustion room is big enough to accomodate the flame
without it touching any watercooled areas. There also has to be ample room for
the ashes produced by the stoker. The flue tubes has to be sufficently big not to be
blocked by ashes.
Wood boilers have the advantage of being roomy inside, and is often easier to
clean, but most oil boilers are also suitable for PX21. If the stoker is to be installed
in a combined wood and oil boiler, first find out if there is a big difference in stated
output between oil and wood. If the difference is less than 10 kW the stoker should
be placed in the wood hatchet if it can be opened with the stoker in situ.
Small kitchen boilers are often too small to be suitable.
Installation in a boiler with high output (>40 kW) can result in too low flue tempera-
ture (see section Chimney).
Keep an alternative source of energy (electricity, wood or oil) in parallel
with the pellet stoker.

1 2 3
PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 5/16
Electric installation
All electric connections on the stoker and
screw feeder have fast action connectors
as below
1. To boiler temperature sensor
2. To screw feeder (230V)
3. Supply (230V)
There is also a connector on the feeder motor (same as number 3 in Fig. 2). The yel-
low cover has to be removed before the cords can be disconnected from the stoker.
The mains power cord must be installed by an authorized electrician.
A safety cut-out thermostat on the boiler must be used.
NOTE! Old manual reset cut-out thermostats can cause problems.
These shall be removed and replaced by new.
All connections are to be made with the enclosed cables and connectors.
NOTE! The stoker has to be connected to the mains on a manual reset cut-out
thermostat on the boiler.
The bulb of the cut-out thermostat has to be immersed in the boiler water or other-
wise located on the boiler where a quick action is guaranteed in case of overheating.
If there is no thermostat on the boiler, an external one has to be installed (optional
extra).
NOTE! If a non-standard feeder motor of more than 300 watts is being used, an
intermediate relay has to be used.
Fig. 2 Connectors on the stoker.
Electric circut diagram
12345678910 11 12 13 14 15 16 17 18 19 20
M
NL
NL
Tr ansformer 230 / 12 V
black black
white orange
green
red grey grey
white white
white
white
brown
blue
blue brown brown
Te rminal block on PC-card
Blower
To screw
feeder
Temp. sensor
Flame sensor
Ignition
element
cut out
Thermal
yellow/green
yellow/green

1
2
3
4
5
PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 6/16
Start and setting
First start
The stoker is not shipped with a basic setting for normal conditions. Normally both
power modes (high and low) shall be used, but the low power mode can be turned
off with a simple switching on the control board if needed.
If installed in a large or highly effective boiler giving low flue temperature (less than
180˚C), the stoker should be run in full power mode only. Thus condensation in the
chimney can be avoided. Note that a chimney equipped with an insert tube can
withstand a certain amount of condensation without risk. If in doubt, contact a
chimney sweeper.
Setting air and fuel levels
1. Before attaching the feeder to the stoker it must be filled with pellets by con-
necting the motor directly to the mains using the cable for the stoker.
Let it run it for a few minutes after it has been filled.
2. Adjust the start dosis (amount of pellets at ignition) with Potentiometer #2,
turning clockwise increases. Normal dosis is circa 3 - 4 dl. To activate a new
adjustment the mains has to be switched off for a few seconds.
3. To adjust the fuel level for full power, start the stoker and wait for 5 minutes
after the green LED has stopped blinking, then turn Potentiometer #1 until the
blaze looks right. Normally the feeder motor should do about 3/4 of a turn
every 20:th second.
Fine tuning full power
In order to get optimal result, a flue gas tester must be used.
Consult your local ditributor. It is important to achieve the right mixture between
fuel and air to get good economy. A few minutes after startup the blaze should
have a yellow-white colour. If it is dark yellow there is too much fuel or too less air.
A very light blaze indicates the opposite. Gray or even black smoke from the chim-
ney also indicates too less air. White smoke consists mainly of steam, wich is normal
under certain weather conditions.
If the boiler has been fired with wood earlier, the smoke can be dark and smelly
because of the combustion of tar on the boiler walls.
Note! The blaze normally varies in colour (dark and light yellow) even when burn-
ing steadily. If you change pellet type or make, you must controll the settings.
Fine tuning low power
Wait until the stoker goes into the low power mode (yellow LED), adjust the air level
using Potentiometer #4 the same way as in high power mode. The blaze should be
considerably smaller than when running in full power.
Disconnecting low power mode
Remove the strap on the right side
of the control board.
Fig 4.
Potentiometers for adjustment.
Pot #1: Fuel rate in full power.
Pot #2: Fuel rate at ignition.
Pot #3: Air rate in full power.
Pot #4: Air rate in low power.
Pot #5: Boiler temperature.
Fig 3.
Strap for full and low power.
Pellets quality
Most qualities of wooden pellets can be handled, but 6 or 8 millimetres
diameter is recommended.
Bigger pellets can cause an uneven combustion.

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 7/16
Storage tank
Using a storage tank
The larger water volume achieved with a storage tank makes the stoker running in
longer intervals, thus giving higher efficiency.
However, the cost of installing a new storage tank is normally not profitable due to
the extremely high thermal efficiency of the PX50 stoker.
Installation on a boiler system using a storage tank
If there is a calorifier or a shunt valve in the boiler, the temperature sensor should always
be attached directly to the boiler, preferably in an immersed tube. When the boiler and
the tank are in direct-cycle, the water temperature should not be below 60°C when
the stoker starts, otherwise condensation may lead to corrosion of the boiler body.
If the calorifier and shunt valve is situated in in the tank, the temperature sensor can
alternatively be placed on the tank, this leading to longer running intervals, thus mini-
mizing the number of starts and stops.
Placing the temperature sensor on the tank
If the temperature sensor is to placed on the storage tank, the charging pump
system must have capacity enough to cool the boiler off sufficiently.
Boiler temperature must not exceed 95˚C before the tank temperature is about
80˚C (recommended temperature) and the stoker stops.
The cut-out thermostat must always be attached to the boiler!
The temperature sensor must not be located to low, in wich case the boiler might be
overheated.
If uncertain, make a test as follows:
Run the stoker until boiler temperature reaches about 95˚C. Then measure the tem-
perature on different spots on the tank. Choose a place that is maximum 80˚C and
where the sensor can be attached conveniently. A special storage tank control unit is
as extra accessories.
Fig. 5 Boiler with storage tank.

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 8/16
Pellet retarder - feeder pipe
When the pellets are extremly hard and/or the hose to the feeder pipe is unusually
long the pellets occationally fall out of the burner. To prevent this you could mount
the pellet retarder.
Unscrew the screw in the front of the feeder pipe. The pellet retarder mounts with a
screw from the outside. (RXS 4,2 x 9,5).
Maintenance
The stoker is cleaned by raking out the ashes inside, wich must be done once a
week during the cold season. Otherwise a cleaning every other week is sufficient.
At these occasions the boiler also should be rinsed from ashes.
Ashes and soot inside the boiler can set back the efficiency dramatically.
Note! If the boiler previously has been fired with wood there’s a risk of soot and
taar getting loose and choke up the flue pipes and even the chimney. Check and
rinse if needed when rinsing the stoker for the first two months after installation.
The burner must be dismantled at least four times per year.
The outer and inner burner tubes should be separated and cleaned from sintered
ashes. Dismantle by loosing four screws on the front of the stoker.
Note that all cables have to be unplugged before removing the cover.
Safety systems
The PX50 stoker meets all current safety regulations and standards.
There are two separate safety systems to avoid fire and hot gases going backwards:
a slooping stainless steel tube for the pellet feeder, and a cut-out thermostat on the
tube.
These safety systems are independent of the electronic control system and therefore
cannot be disturbed by outer causes as for instance lightning.
There is also a third safety device: a light sensor that stops the stoker if the fuel level
gets too high, or if it has not been cleaned in time. When stopped, the stoker will
display a red lamp.
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.

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 9/16
NOTE!
All work as described in the following text must be done by a qualified
person.
Changing the ignition element
1. Remove the yellow cover.
2. Disconnect the two grey wires to the ignition element.
3. Remove the four screws that holds the housing to the flange and carefully
split the stoker.
4. Remove the two screws on the bottom, under the stoker.
5. Unscrew the screw that holds the element and take the heater element out
of the coned tube.
6 Replace the element.
7. Refit in reverse order.
Changing light sensor
1. Disconnect all three cables on the stoker.
2. Remove the three brass nuts holding the cover, and pull the cover backwards.
3. Disconnect the white wires from the terminal block (no. 17 & 18) and pull the
sensor out of its hole to the left of and beneath the ventilator.
4. Push the new sensor into the hole until it gets stuck. Be sure to align it
perpendicular to the surface. Reconnect the wires on the terminal block and
refit the cover.
Dismantling the screw feeder
1. Disconnect the cable on the feeder motor.
2. Remove the plastic hose between the feeder and the stoker.
3. Loosen the socket head cap screw under the motor, pull the motor straight up
and away.
4. Remove the two screws holding the flange roller bearing.
Pull the feeder screw out.
5. Refit in reverse order. Be sure to get the socket head cap screw into the groove
of the motor axle.
NOTE!
When an ignition failure occurs, don’t open the hatch until the combustion
chamber is properly ventilated!
Fig. 6 Ignition element

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 10/16
Troubleshooting and repair
Stoker stopped,
red light
• Pellet hopper empty.
• Pellet have formed a valve at
feeder screw inlet.
• Pellet feeder blocked by
foreign object.
• Stoker 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. If no start: 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.
Fault Cause What to do
Stoker doesn't ignite,
remaining pellets in
stoker not scorched.
• Faulty ignition element. See section Changing the heating
element..
Fault Cause What to do
Stoker 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.
Stoker 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.
Clear out ashes at least once a
week during the cold season.
Stoker has stopped,
no red light
• Burner has been overheated. Clean out ashes from burner and
boiler.
Reset cut-out thermostat on the
feeding shaft.

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 11/16
Outer tube
Inner tube
Pellet stop
Rear housing
Igniter console
Ignitor element tube
Tr ansformer
Blower
Control panel
Connectors
Feeding tube
Cut-out thermostat
Exploded view / Technical data
Technical data
Dimensions outside boiler (b x h x d)........ 300 x 310 x 300 mm
Dimensions inside boiler (Ø x l)........................ Ø180 x 200 mm
Efficiency ..................................................................... ca 95%
Output maximum .......................................................... 50 kW
Output minimum.......................................................ca 20 kW
Voltage ...................................................................... 230 VAC
Power consumtion (mean under power)...........................50 W
Weight ............................................................................12 kg
Length standard screw feeder ......................................... 1,7 m
Accessories and fittings
• Adaptor plate
• Adaptor plate with ange
• Overheat cut-out thermostat for boiler
• Longer screw feeder
• Suspension chain for screw feeder
• Ash separator for vacuum cleaner

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 12/16
Warranty
For warranty issues Ariterm Sweden AB refers to our local Distributor.

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 13/16
Installation certificate (Customers copy)
Serial number: ...................................... Date of installation: ..............................
Chimney draught (cold): ................... Pa Temperature outside: ........................°C Flue gas temperature (max power):........... °C CO2 content:........................ %
Chimney draught (hot):..................... Pa Boiler (make/model):..................................................................................... Year manufactured:.....................................
Installed at:
Name:.................................................................................................................................... Telephone: .................................................................................
Address: ................................................................................................................................ Postal address: ...........................................................................
Sold by:
Seller: ................................................... Company:............................................
Address: ................................................................................................................
Postal address: .......................................................................................................
Telephone:............................................ Mobile:................................................
Installed by:
Assembler:............................................ Company:............................................
Address: ................................................................................................................
Postal adress: .........................................................................................................
Telephone:............................................ Mobile:................................................
Installed product: Pellet stoker type PX50

PELLET STOKER KMP PX50
ARITERM SWEDEN AB Installation Instructions - 2007.12.14 - 15/16
Installation certificate (Sellers copy)
Serial number: ...................................... Date of installation: ..............................
Chimney draught (cold): ................... Pa Temperature outside: ........................°C Flue gas temperature (max power):........... °C CO2 content:........................ %
Chimney draught (hot):..................... Pa Boiler (make/model):..................................................................................... Year manufactured:.....................................
Installed at:
Name:.................................................................................................................................... Telephone: .................................................................................
Address: ................................................................................................................................ Postal address: ...........................................................................
Sold by:
Seller: ................................................... Company:............................................
Address: ................................................................................................................
Postal address: .......................................................................................................
Telephone:............................................ Mobile:................................................
Installed by:
Assembler:............................................ Company:............................................
Address: ................................................................................................................
Postal adress: .........................................................................................................
Telephone:............................................ Mobile:................................................
Installed product: Pellet stoker type PX50

If these instructions are not followed during installation, operation
and maintenance, the obligations of Ariterm Sweden AB under the warranty
regulations are no longer binding. Ariterm reserve the right to alter any details
and specifications without prior notice.
Ariterm Sweden AB
Flottiljvägen 15, SE-392 41 Kalmar
www.ariterm.se