THERMOSTAHL NANI 35 User manual

PELLET BURNER
NANI 35
INSTALLATION AND USER MANUAL
VERSION:
1.2
UPDATE:
25.01.2019

Contents
1. Warnings, Cautions and Notes .......................................................................... 3
1.1. Document information ....................................................................................... 3
2. Function principle.............................................................................................. 4
3. Technical specifications..................................................................................... 4
4. Boiler ................................................................................................................ 5
5. Chimney ............................................................................................................ 5
6. Electrical connections........................................................................................ 6
7. Controller .......................................................................................................... 7
7.1. General description ........................................................................................... 7
7.2. Description of buttons........................................................................................ 7
8. Operation functions........................................................................................... 8
9. Parameters........................................................................................................ 9
10. Room thermostat ............................................................................................ 11
11. Start of the burner .......................................................................................... 11
12. Stop of the burner ........................................................................................... 12
13. Cleaning burner's chamber.............................................................................. 12
14. Restart the burner after an error..................................................................... 13
15. Feeder filling procedure .................................................................................. 13
16. Burner safety systems..................................................................................... 13
17. Errors .............................................................................................................. 14

3
1. Warnings, Cautions and Notes
1.1. Document information
This document is an integral and indispensable part of the product and must be retained in good
condition by the user. Keep it in a safe place for future reference.
If the appliance is sold or transferred to another person, this manual has to always follow the
appliance and handed to the new user or installer.
Read the safety instructions carefully before
installation. Always follow the safety
instructions during installation and during
maintenance
Installation, operation, service, and other work
must be carried out by qualified personnel in
accordance with local codes and regulations.
All electrical installation and service work shall
be done by certified and qualified personnel
inaccordance with local codes and regulations.
Do not perform electrical work unless you have
the required qualifications. Perform a
complete burner shutdown and disconnect the
power supply prior to performing any work on
the burner. Observe all guidelines with respect
to installation, service, or cleaning.
Children and adults should be alerted to the
hazards of high surface temperatures and
should stay away to avoid contact to skinand /
or clothing.
Always follow the instructions for operations
and service.
There is a risk of burn from touching the
equipment during operation.
The burner casing, burner body, flange, and
flame trap pipe are hot surfaces during
operation. Keep children away and do not
touch the equipment during operation.
Young children should be carefully supervised
when they are in the same room with the
burner.
Electric switch must be used to the
power supply cable as an emergency stop
Only wood pellets are to be used with this
burner. No other fuel is to be used in the
burner.
NEVER BURN ANY TYPE OF CORN, CHERRY
PITS, STICKS OR OTHER TYPES OF FUEL
IN THE BURNER.
Burning wood pellets according to
recommendations and the specifications set
forth will assure longer burner life and lessen
potential maintenance issues.
DO NOT install in a sleeping room.
DO NOT connect to any air distribution duct or
system.
DO NOT terminate the vent in any enclosed or
semi enclosed area, such as; carports,
garage, attic, crawl space, under a sun deck
or porch, narrow walkway or closed area, or
any location that can build up a concentration
of fumes such as a stairwell, covered
breezeway etc.

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2. Function principle
The burner's operation is based on providing fuel via controlling the feeder appropriately and
also the air fan which steers the burning process. After reaching a particular temperature of the
heating water, the burner goes into the mode of maintaining the temperature or switches the
burner completely off. The ignition of fuel starts automatically with the help of an igniter and the
fire is detected by the fire sensor.
The burner has three modes of operation: Continuous/Single/Analogue (see paragraph 8).
The burner can also control Hot Usage Water (WUW or HUW) pump or buffers tank's pump. The
WUW pump starts working when the regulator detects too low temperature of the WUW buffer.
It is also possible to stipulate the working mode of the WUW pump –with a priority or without
it. The burner can be also controlled (ON/Off) by the Room Thermostat or by any external
thermostat. The burner is also equipped with the self-control systems (detecting the malfunction
of the temperature's sensors) and mechanisms monitoring the furnace's work preventing from
going beyond the range of safety for the installation of the central heating.
3. Technical specifications
Type
Nani 35
Heat output
Heat outup
10-35 kW
Maximum pellet
consumption
2-7,45 kg/h
Average pellet
consumption/day
8-55 kg
Lenght (total)
610 mm
Width
210 mm
Height with feeding pipe
420 mm
Height without feeding pipe
225 mm
Diameter
Ø137 mm
Power supply
230Volt / 80Hz
Average power consumption
30-40 Watt (approx.)
Fuel
Wood pellet
Ø6-8mm, hymidity <10%
Weight
14 kg
Feeder's length
1,5 m

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4. Boiler
It is important to check that the combustion chamber in the boiler is big enough to ensure that
the flame does not come in contact with the water-cooled walls. Verify that the boiler’s capacity
range complies with the burner. There must be enough space for the ash to accumulate. The
exhaust gas channels should not be so narrow that they can easily be clogged with ash.
The distance between the front edge of the burner and the rear part of the combustion chamber
should be at least 300mm for low burner's power (10-20kW) If the burner's power increase then
the distance must be increased. This distance is also depended on the boilers construction and
if the boiler is (oil/gas boiler or wood boiler)
The minimum distance to the bottom of the fireplace also depends on the boiler design.
There must be enough space for the quantity of ash build up that is created during at least one
week’s use in the winter heating season.
5. Chimney
We recommend that you have a local chimney sweeper or other corresponding authority make
an inspection and provide advice and instructions on the chimney measurements in accordance
with local codes and regulations.
The chimney should be of a length and diameter that gives a draught of 10 - 25 Pa. Measures
have to be taken if the chimney is smaller or much larger in diameter in order to give the proper
draught and flow.
If there is not enough draught in the chimney, exhaust gases stack in boiler's combustion
chamber or in the chimney with the risk of explosion. Also, gas flow into the boiler's room can
happened.
Always check the exhaust gas temperature. Directly after the boiler it should be between 160°C
and 250°C.
Too high a temperature can damage the chimney and is not economical.
Too low a temperature, a very high chimney, or a large chimney diameter creates a risk for
condensation that can cause corrosion and damage due to freezing.

6
6. Electrical connections

7
7. Controller
7.1. General description
Description:
Diodes signalizing the status of outputs and the working mode of the driver,
LCD screen used for communication between the device and the user,
Buttons steering the driver's work.
7.2. Description of buttons
Button
Function
1
Changes the burner's working mode –“STOP”, “IGNITION”, “AUTOMATIC
WORK”.
2
Return to the previous menu
1
Entry on the Menu's parameters
2
Saves the change of a parameter
1
In the Ignition MODE activates the feeder for the time specified on the
parameter “Filling Feeder Time”
2
Go to the previous menu or parameter
Decreases the value of a parameter
1
In the Ignition MODE activates the ignition procedure
2
Go to the menu or parameter
Increases the value of a parameter του καυστήρα.

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8. Operation functions
After switching the burner on, it is appeared on the LCD screen the program's logo defining the
type of the driver and the version of the current software
While activating, the burner carries out a test of the connected sensors. In case of one lacking,
on the screen appears an appropriate message (---). The work of the burner without a heating
water temperature sensor (CH) is blocked and an emergency mode is activated (CH pump is still
on).
Correct connection of sensors causes displaying of actual CH furnace's temperature and the
temperature of useful warm water of the WUW buffer (if the function is active). On the screen
appears which function is currently used by the driver.
The burner may work in three working modes (“STOP”, “IGNITION”, “AUTOMATIC WORK”). The
mode changes when the “MODE/ ” button is pressed. Activating the “STOP” mode is possible
in all modes after pressing the “MODE/ ” button for 3 seconds. When Stop is activated, the
burner goes at “Burning off” process (if there is fire) and the at “Cleaning” process.
When the burner is activated for first time, it is on “Stop” mode. Every next time, its status is
saved in the regulator's non-volatile memory. Activating the driver again, automatically causes
switching on of the lately used working mode.
In the table beneath a short description of particular functions of the burner, activated depending
on the working mode of the driver, is shown.

9
FUNCTION'S NAME
DESCRIPTION OF FUNCTIONS
STOP
Burner stopped.
FEEDER FILLING
Filling the feeder.
Filling stops automatically after about 10 minutes.
IGNITION
The burner is on Ignition process, which mean that has fed with ignition dose
of pellet, the heating element (igniter) and the air fan are working. The mode
would be automatically changed after detecting a flame by the sensor.
CLEANING
The air fan works at full speed for one minute, to remove the remaining
ashes from the burner's fire chamber. This function takes place also at the
first minute of ignition
WORK
Heating the boiler up to the set temperature. Showing the actual power of
the burner.
MAINTAIN
Sustaining the set temperature (if the burner's working mode is in the mode
of continuous work)
BURNING OFF
Putting off the burner. Active in the “STOP” mode or in the temporal working
mode of the burner.
STANDBY
Standby of the burner for the decline of the temperature of a hysteresis (if
the burner's working mode is in the temporal mode).
9. Parameters
To move round the menu and to set particular parameters there are four buttons placed on the
driver's panel: “MODE/ ”, “MENU/OK”, “+”, “-”. The parameters chosen by the user are
divided into four groups: (A) “CH FURNACE SETTINGS”, (B) “WUW BUFFER SETTINGS”,
(C) “BURNER SETTINGS”, (D) “DRIVER SETTINGS”. The division of particular parameters
in groups is shown in the “Settings table”.
CH FURNACE SETTINGS (A)
FUNCTION
NO.
FUNCTION
NAME
SETTING
UNIT
SETTING
RANGE
MANUFACTURER
SETTING
1
HEATING WATER
TEMPERATURE
ºC
35 - 85
65*
2
CH PUMP ACTIVATION
TEMPERATURE
ºC
20 - 60
35*
3
CH FURNACE
HYSTERESIS
ºC
1 - 20
5*
4
FURNACE
MODE
---
Winter/Summer
Winter*

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WUW BUFFER SETTINGS (B)
FUNCTION
NO.
FUNCTION
NAME
SETTING
UNIT
SETTING
RANGE
MANUFACTURER
SETTING
1
WUW BUFFER
TEMPERATUR
ºC
20 - 80
40*
2
WUW SURPLUS
TEMPERATURE
ºC
5 - 20
10*
3
WUW
PRIORITY
---
Yes/No
No*
BURNER SETTINGS (C)
FUNCTION
NO.
FUNCTION
NAME
SETTING
UNIT
SETTING
RANGE
MANUFACTURER
SETTING
1
BURNER POWER
(WORK)
kW
10 - 80
30*
2
BURNER POWER
(MAINTAIN)
kW
2- 9
3*
3
BURNER
MODE**
---
Continuous/
Single/Analogue
Continuous*
4
SELF CLEANING FREQUENCY
TIME
Min
10-480
240
5
SELF CLEANING TIME
sec
0-60
0
6
BURNER FLAME MEASUREMENT
%
0-100
-------
** Burner has 3 modes: continuous mode, single mode and analogue mode.
Single mode: The burner reaches the desired “HEATING WATER TEMPERATURE” and burns off.
Then, it starts its operation again when the temperature of the boiler goes down to the
temperature “HEATING WATER TEMPERATURE - CH FURNACE HYSTERESIS”. The CH FURNACE
HYSTERESIS must be more than 10oC.
Continuous mode: The burner reaches the desired “HEATING WATER TEMPERATURE” and goes
down at 3kW (maintain). When the boiler's temperature goes down to the temperature
“HEATING WATER TEMPERATURE - CH FURNACE HYSTERESIS”, the burner increases its power
from 3kW (maintain) to the maximum burner power (i.e30kW). The CH FURNACE HYSTERESIS
must be no more than 5oC.
Analogue mode: The burner reduces its power 1/3 (for example: from 30kW to 21kW) 10oC
before the furnace reaches the “HEATING WATER TEMPERATURE”. When the temperature of the
furnace is 5oC before “HEATING WATER TEMPERATURE”, the burner reduces its power again 1/3
(for example: from 21kW to 12kW).

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DEVICE SETTINGS (D)
FUNCTION
NO.
FUNCTION
NAME
SETTING
UNIT
SETTING
RANGE
MANUFACTURER
SETTING
1
LANGUAGE
SETTINGS
---
Polish/
English/
German/Greek/
Serbian/...
English*
2
FACTORY
SETTINGS
---
Yes/No
---
3
ENABLE SERVICE
MODE
---
000 - 999
---
10. Room thermostat
The room thermostat (or a timer) can be connected on the connector which is at the back of the
controller, by replacing the “bridge (or on the PINs 1&2 in the controller).
It is forbidden to give voltage to room thermostat's connection (pin 1&2). The
connection with the room thermostat must be only a “Cold junction”
When a room thermostat is connected in the controller, we have the two following options:
If external control No (Manufacturer's settings):
1. When thermostat is ON, the burner works at the maximum power is set.
2. When thermostat is OFF, the burner burns off
This is mostly suggested for low consumption houses (less than 3.000kg/year) or for connecting
with timer.
If external control Yes (Manufacturer's settings):
1. When thermostat is ON, the burner works at the maximum power is set.
2. When thermostat is OFF, the burner goes at maintain mode and keeps a small fire.
In both cases, when the thermostat is OFF, the CH pump stops.
11. Start of the burner
1. Activate the burner by connecting it with a power supply (230Volt, 50Hz)
2. It is written on the LCD screen the following

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3. By pressing the button “MODE/ “ once changes the operation from “Stop” to “ignition”.
By pressing the button “MODE/ “ changes the operation from “Ignition” to “Automatic”.
4. In “Automatic mode”, starts the operation of the burner.
5. When the photo sensors detects fire, then the burner starts its “Work” by increasing its power
gradually to the power it has been set (i.e 30kW)
6. When the boiler's water temperature reaches the desired temperature “HEATING WATER
TEMPERATURE “, the the power of the burner goes down ta 3kW (Maintain mode)
7. The burner works at “Maintain mode” till the boiler's water temperature goes down to the
temperature:
“HEATING WATER TEMPERATURE - CH FURNACE HYSTERESIS”
12. Stop of the burner
1. The burner can be either at “Work” or “Maintain” or “standby”
2. Press the button “MODE/ “continuously till “STOP MODE” appears on the screen.
3. It is written “Burning off” till the photo sensor stops to detect fire (3-5 min)
4. When the photo sensor stops to detect fire, “cleaning procedure takes place for few seconds.
13. Cleaning burner's chamber
1. The burner can be either at “Work” or “Maintain” or “standby”
2. Press the button “MODE/ “ continuously till “STOP MODE” appears on the screen.
3. It is written “Burning off” till the photo sensor stops to detect fire (3-5 min)
4. When the photo sensor stops to detect fire, “cleaning procedure takes place for few seconds.
5. When “Stop” appears on the LCD screen, waiting few minutes till the burner cools down.
6. Open the boilers door, clean the burners tube and close back the door.
7. By pressing the button “MODE/ “ once changes the operation from “Stop” to “ignition”.
By pressing the button “MODE/ “ changes the operation from “Ignition” to “Automatic”.
** The frequency of cleaning burner's chamber is depended on wood pellet quality. If
premium pellet is used, It is suggested the burner's chamber to be cleaned once a
week.

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14. Restart the burner after an error
1. Turn off the burner by using the electric switch the burner is connected.
2. Open the boiler's door and check the burner tube.
3. Remove any ashes and impurities from burner fire chamber.
4. Close the door and switch on the controller by using the electric switch the burner
is connected
5. By pressing the button “MODE/ “ once changes the operation from “Stop” to “ignition”.
By pressing the button “MODE/ “ changes the operation from “Ignition” to “Automatic"
15. Feeder filling procedure
1. Remove the plastic tube connection the burner with the feeder
2. Burner must be at stop mode. So, “Stop” appears on the LCD scree
3. By pressing the button “MODE/ “ once changes the operation from “Stop” to “ignition”.
4. “CHOICE FUNCTION-/+” appears on the LCD screen
5. Press the button to start the feeder
6. Feeders operation lasts 11min (Manufacturer's setting / Feeder's filling time"
7. When the wood-pellet starts to come out of the feeder, press to stop the feeder
8. Connect the feeder with the burner, by using the plastic pipe.
9. If the "Feeder's filling time" is not enough, press to start the feeder again
16. Burner safety systems
For total, fail-safe security, the burner is equipped with four safety systems:
1. The plastic pipe connecting the feeder with the burner. This tube will melt away from the
burner in event of a too high temperature, thereby breaking contact between pellets fuel
replenishment and the burner.
2. The burner’s fall-tube is equipped with a back-burn protection system which is triggered at
65oC. The back-fire protection system is placed on the fall-tube. In the event of the alarm being
triggered always investigate the cause and rectify.
3. The Overheating Boiler sensor (STB sensor), which is activated when the boiler's temperature
is higher than 95oC. When this protection is activated, the light next to the STB sensor is ON and
the feeder is turned off. The, you must reset the STB sensor, the feeder to work again.
4. The photo sensor senses that ignition has taken place and is running normally.

14
17. Errors
Indication
Description
Solution /
CH:!!!!
WUW:!!!!!!
STOP
Malfunction of the water
temperature sensors
1. The driver starts up relevant emergency
procedures for every sensor in order to prevent
the boiler from working beyond the safe range
for the installation of the central heating
2. When the boiler cools down, then restart the
controller and set the burner on automatic mode.
"Furnace
protect"
The temperature in the boiler
is higher than 92oC. If the
temperature is above 95oC,
the STB sensor is activated
and the feeder is turned off
automatically (the light next
to the STB sensor is ON).
At any case the pumps are
activated to avoid higher
temperatures
1. Wait till the boilers water temperature goes
down to 60oC
2. Reset the STB sensor, so the light next to it
to be OFF.
3. Restart the controller and set the burner at
automatic mode.
"Burner alarm"
The temperatures on burner's
feeder pipe is higher than
70oC. (Back fire protection)
This is happened either the
chimney's draught is no the
appropriate or the burner
hasn't been cleaned.
If the temperature goes down to 60 oC and the
photo sensor scans light, then the burner's
operation continuous normally.
If the temperature goes down to 60 oC and the
photo sensor doesn't scan any light, then the
signal “Burner alarm” is still on the LCD and you
must restart the controller.
"NO pellet"
No pellet on the silo
1. Fill up the silo with pellet
2. Fill the feeder with pellet (Filling feeder
procedure)
3. Set the burner at automatic mode
The feeder doesn't work
If the light next to STB sensor is ON, it means
that overheat of the boiler has occurred and STB
has turned the feeder OFF.
1. Reset the STB sensor, so the light next to it
to be OFF.
2. Restart the controller and set the burner at
automatic mode.
Check the cable from feeder to the controller
3. Problem during ignition
procedure
Burner's tube hasn't been cleaned properly
1. Clean the burner
2. Restart the controller and set the burner at
automatic mode.
Igniter doesn't work
1. Change the igniter inside the burner.

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THERMOSTAHL ROMANIA
HEATING SYSTEMS S.R.L.
DRUMUL OSIEI 57-59, sector 6
Bucharest 062395, Romania
www.thermostahl.ro