Mareli Systems LC 25 User manual

Mareli Systems
LC 25 / 30 / 35 / 40 / 50 KW
SOLID FUEL BOILER
Assembly and exploitation manual

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Mareli Systems
Observing the prescriptions of the present manual is in the user’s favour and is one of the warran-
ty conditions. Compliance with this instruction is in the interest of the consumer and one of the
warranty terms. ese instructions are an integral part of this product. All rights reserved. Repro-
duction of content of this document and transfer to third parties is not allowed without written
approval from manufacturer. Make sure the instructions are always with the device, even if its sale
transfer of another owner to the user or sta authorized for maintenance or repairs to consult.
INSTRUCTIONS FOR SECURITY:
READ THESE INSTRUCTIONS CAREFULLY BEFORE
INSTALLING THE BOILER TO HEATING SYSTEM!
BOILER MUST NOT OPERATE IN FLAMMABLE AND EXPLOSIVE ENVI
RONMENT.
BEFORE ANY WORK ON THE BOILER, ELECTRIC ENERGY MUST BE
SWITCHED OFF.
!
• is appliance is not intended for use by people (including children) with limited physical, sensory
or mental abilities or lack of experience and knowledge. e installation must be performed by
a qualied expert in the eld of heating installations or authorized by “Marelli Systems’ service.
e place and way of connecting the boiler should be selected carefully in accord with the safety
instructions. Install away from ammable objects!
• Carefully read the warnings in this instruction manual as they provide important indications re-
garding safe installation, use and maintenance.
• e instruction manual is an integral and essential part of the product and must be kept carefully
by the user, for any subsequent consultation.
• If the appliance is to be sold or transferred to another owner or if it is to be moved, always ensure
that the manual accompanies the boiler so that it can be consulted by the new owner and/or the
installer.
• Installation and maintenance operations must be carried out respecting the norms in force, in ac-
cordance with the manufacturer’s instructions, and must be carried out by professionally qualied
personnel.
• Incorrect installation or improper maintenance can cause damage to people, animals or property.
Any responsibility on the part of the manufacturer is excluded for damages caused by errors in
installation and use, and in general for non-observance of the instructions provided by the man-
ufacturer.
• Before carrying out any cleaning or maintenance operation, disconnect the device from the power
supply by operating the installation switch and/or using the appropriate locking devices.
• In the event of malfunction and/or malfunction of the device, disable it, avoiding any attempt at re-
pair or direct intervention. Contact only professionally qualied personnel. Any repair or replace-
ment of the products must be carried out only by professionally qualied personnel, using only
original spare parts. Failure to comply with the above may compromise the safety of the device.
• In order to guarantee the proper functioning of the device, it is essential to ask qualied personnel
to carry out periodic maintenance operations.
• is appliance must only be used for the purpose for which it was expressly designed. Any other
use is considered improper and therefore dangerous.
• Aer unpacking, check the integrity of the contents. e packaging materials must not be le
within the reach of children as they constitute a potential source of danger.
• If in doubt, do not use the device and contact the supplier.
• e device and its accessories must be disposed of properly, in accordance with the regulations
in force.
• e images in this manual are a simplied representation of the product. In this representation
there may be small and insignicant dierences compared to the product supplied.

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Mareli Systems
A
B
C
D
E
F
G
G 1-1/4”
G 3/4”
G 3/4”
G 3/4”G 1-1/4”
6
5
13
16
19
19

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13
H
I
1
3
2
4
7
8
9
10
12
11
14
15
17
18
20
21
22
23

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1Combustion chamber 13 Drain valve
2Grill for burning 14 ermoregulator connection
3Boiler body 15 Air valve
4Exhaust gas connection 16 Hatch for cleaning
5Water outlet 17 Flap with opening for smoke
extraction
6Water inlet 18 Air vent valve
7Upper door 19 Connections for the thermal
safety valve
8Central door 20 Ash container
9Lower door 21 Cleaning tool
10 Pellet burner mounting ange 22 Secondary air regulator
11 Boiler base 23 Fixing screw for secondary air
regulator
12 Insulation
LC Greutate
(kg) B (mm) H (mm) A (mm) C (mm) D (mm) E (mm) F (mm) G (mm) I (mm)
25 262 465 969 1294 160 300 864 1125 1235 Ø149
30 280 510 969 1294 160 300 1014 1140 1235 Ø149
35 301 560 969 1294 160 300 1014 1140 1235 Ø149
40 321 610 969 1294 160 300 1014 1115 1235 Ø179
50 350 610 1044 1294 160 300 1014 1115 1235 Ø179

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TECHNICAL DATA
LC 25 30 35 40 50
Nominal Power (kW) 25 30 35 40 50
Weight (kg) 262 280 301 321 350
Required draft (mbar) 20 21 22 23 25
Max working temperature (ºC) 90 90 90 90 90
Max working pressure (bar) 2.5 2.5 2.5 2.5 2.5
Boiler water content (litres) 93 98 104 109 120
Height (mm) 1294 1294 1294 1294 1294
Width (mm) 465 510 560 610 610
Depth (mm) 969 969 969 969 1044
Flue gas exhaust connection (mm) 149 149 149 179 179
Distance boiler base - basket connec-
tion (mm) 1125 1140 1140 1115 1115
Inlet / outlet connection (“) G 1-1/4” G 1-1/4” G 1-1/4” G 1-1/4” G 1-1/4”
Combustion chamber volume (dm³) 73 87 97 108 124
Max wood length (mm) 500 500 500 500 550
Chimney internal diameter (mm)* 200 200 200 200 200
Chimney height (m)* 7-8 7-8 8-9 9-10 10-12
Heated surface area (m²)* 120-150 150-180 180-210 210-240 240-300
* The values in the table are indicative. For the exact calculation of the dimensions of the chimney,
contact a specialized company.
• All the models from 25 to 50 kW, can work with pellets with a pellet burner kit and are de-
signed in accordance with European norms EN 303/5.
• The thickness of the walls of the boiler that comes into contact with water is 5 mm
• The boiler is equipped with a thermometer, ash tray and cleaning kit.
• The upper door is provided with an adjustable opening for adjusting the secondary air.

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2. BOILER INSTALLATION
The room where the boiler is to be placed must be provided with ventilation. It must be placed in
such a way that there is access on all sides, according to the attached sketch:
400
400
500
700
2.1 Location of the boiler
2.2 Connection to the chimney
min 500 mm
min 500 mm
10 mm
10 mm
Opening for the
cleaning
ermal insulation
ermal insulation
Opening for the
cleaning

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e dimensioning of the chimney is a
very important condition for the opera-
tion of the boiler at optimal parameters.
e chimney must be designed in such a
way as to make the gases escape correctly
and to keep the necessary air in the boiler.
e diagrams below show how to choose
the height of the chimney depending on
its diameter and the power of the boil-
er. Choosing the right insulation for the
chimney is very important and it must be
30-50 mm thick. e correct choice of the
chimney diameter and height are decisive
in the correct operation of the boiler. To
meet the above conditions, consult the
chimney manufacturer’s specialists. e
minimum height of the chimney for solid
fuel-burning boilers is 6 m. e chimney
must be made of stainless steel elements, to
reduce the inuence of condensation.
3. BOILER INSTALLATION
3.1. Connecting the boiler to a heating system
Heat agent temperature without storage system. Regardless of the type of fuel used for heating, the water tem-
perature must not exceed 90°C. In order to prevent the temperature from rising, it is recommended to install
some safety and control accessories.
e safety valve - must always be positioned and mounted close to the boiler in such a way that access is easy.
e safety valve must be calibrated at a pressure of 2.5 bar. e diameter of the valve opening must reach up to
15 mm. e connection to the boiler must be as short as possible. Any joint, welding, bends or other blockage
must be avoided on the connecting pipe. In the case of unavoidable bends, they must have a curvature of r >3D
(D = radius of curvature) and less than ά > 90.
e closed expansion tank must be mounted as close as possible to the boiler. e connection between the
boiler and the vessel must be as short as possible. e installation of the expansion vessel must be done in line
with the connecting pipe to ensure equal pressure distribution. e report must be:
1kW = 1 liter used.
e safety valve and the expansion vessel must be mounted as close as possible to each other, in the following
order: the expansion vessel closest to the boiler, followed by the safety valve.
It is also recommended that a cleaning device, lter Y, be mounted on the return.
In the event of a power cut when the boiler no longer works properly - any increase in pressure will be taken
over by the expansion vessel rst, and at any increase in pressure to a higher value, the safety valve will open
automatically.
Careful! AIR MUST NOT ENTER THE BOILER!

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bar
CONNECTION EXAMPLE WITH BUFFER + BOILER
1LC boiler 7Heating circuit
2Safety valve 2.5 bar 8Room thermostat
3Circulation Pump Buer 9Electronic regulation unit
4Mixer valve (60 C) 10 Contact thermostat
5Expansion vessel 11 Buer Tank
6Water Boiler 12 Circulation Pump heating
1
2
3
4
5
6
7
8
9
10
11
12

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Example scheme for installation of an anti-condensation valve. It is recommended
that the valve be at least 60 C. At the discretion of the installer, a valve with a higher
return water temperature may be installed.
3.2. Filling the boiler and the installation with water
Filling is done through the emptying connection (which is found on the return of the boiler). e lling process
is complete when no more air comes out through the automatic vent and the pressure gauge indicates a value
between 1.5 and 2.5 bar (in the case of closed systems). e vent will be located at the highest point of the central
heating system (closed). If the pressure drops below 1.5 bar, the lling process will be repeated.
In the case of open systems, the operating pressure depends on the total height of the system and the open
expansion vessel (approx. 1 bar for every 10 m).
Aer the lling process, it is mandatory to close the drain valve, cut o the water supply and detach the lling
pipe.
Installation of the heating system and initial start-up of the boiler is carried out by a specialist authorized by the
manufacturer. In the case of an incorrectly designed system, with proven deciencies, generated by the incorrect
installation of the heating system, which can lead to the defective operation of the boiler, the full responsibility
for material damage and possible new remedial costs will fall exclusively to the person responsible for installing
the heating system central and not the boiler manufacturer or the seller.
4. BOILER OPERATION
Commissioning will be carried out exclusively by a person authorized by the manufacturer.
Prior to commissioning, ensure that:
• e boiler is properly connected to the central heating system.
• e boiler is properly connected to the electrical installation (if using pellets).
• e fuses are chosen accordingly, according to the electrical diagram of the boiler and its power in kW.
• ere is no air in the central heating system and the pressure is within the permissible range.
• e appropriate duty cycle for the circulation pump is selected.

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4.1 Solid fuel operation
Heating with solid fuel can be done in two ways:
TOP HEATING – place the solid fuel in the combustion chamber on top of the pipes (there should be no ash).
e dra regulator is in the maximum position. Light the re at the top with a small piece of wood or charcoal.
When the re starts burning, the dra regulator will be set to the desired temperature/position.
BOTTOM HEATING - place a small amount of solid fuel in the combustion chamber on top of the pipes
(there should be no ash) and light the re. e dra regulator is in the maximum position. When the re starts
to burn, add more fuel and set the dra regulator to the desired temperature/position.
Make sure the boiler doors are closed while the boiler is in use.
In the event of an uncontrolled increase in pressure and temperature of the water in the boiler, determined by
various factors (such as the interruption of the electricity supply, which would lead to the interruption of the
operation of the circulation pump, the failure of the circulation pump, or the uncontrolled ingress of air into sys-
tem), cut o any air supply to the boiler and nally extinguish the re if this is safely possible (provided there are
no ammable materials in the area). In the event of a power outage, place the dra regulator in the zero position
and the boiler ue dra ap in the closed position.
It is mandatory to pay special attention to the pressure in the installation which must be within the allowed
range (>1.5 bar for closed systems). If the pressure is below the critical value, stop the operation of the boiler and
rell the system only aer the boiler cools down.
e water hardness will not exceed the recommended value.
It is not allowed to extinguish the re in the boiler articially. It is forbidden to splash water in the combustion
chamber.
At the end of the cold season, clean the boiler of ash and soot and treat the combustion chamber with a corro-
sion protection agent.
In case of mechanical problems (the dra regulator is blocked, the circulation pump is faulty) stop the operation
of the boiler rst; carry out repair work only when the boiler has cooled down.
4.2 Boiler cleaning and maintenance
It is recommended to clean the boiler of ash once or twice a week or whenever necessary to allow the air re-
quired for combustion to enter through the damper of the dra regulator. A more thorough cleaning of the
boiler is recommended once a month and at the end of the cold season.
Regular maintenance extends the life of the boiler. Cleaning will be carried out through the lower and upper
doors of the boiler but also through the opening on the back.
PROTECTIVE GLOVES ARE OBLIGATORY!

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5. SAFETY MEASURES
5.1 Safety measures in case of overheating
For the hydraulic protection in the closed system, it is necessary to install a 4-way thermal safety
valve, as in the gure below (it is not included in the standard supply).
If for some reason the water temperature in the boiler exceeds 95°C, the thermal valve opens au-
tomatically, so that cold water from the network enters the boiler, to reduce the temperature of the
heating agent, and an equal volume of heating agent from the boiler is discharged at sewage.
According to European EN standards, boiler thermal protection must be installed in closed heating
system.
IMPORTANT:
In case of any damage of boiler installed in the closed heating system due to its overheating, and
boiler or system are not equipped with any thermal protection at all, or do not have properly
installed thermal protection, guarantee will not be applied.
IMPORTANT:
ermal protection must be connected to the water supply installation of the premises supplied
from the water supply line and not from hydrophor. Namely, in case of failure of power supply,
boiler could be overheated, and then hydrophor is not able to ensure required water supply.
Maximum length of the sensor must not exceed 120 mm.
!

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DOMESTIC
water supply
safety
discharge
mains
inlet
MAINS INLET
HOT WATER
SAFETY DISCHARGE
MAXIMUM LENGTH OF
THE SENSOR MUST
NOT EXCEED 120 MM.

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Mareli Systems
S
ESC
SET
P1
P2
P3
P4
P5
P6
P0 50 65 C
RUN MODE
CONTROL PANEL K500 NG21
Main ermostat
Main Temperature
Chrono
Winter / Summer
State
Power
P1 - Exit from menu/submenu rell Function (push for 3 seconds)
P2 - Ignition, extinguishing and errors reset (push for 3 seconds) Enable/Disable Chrono
P3 - Access to User Menu 1/ submenu / Access to user 2 menu (push for 3 seconds) / Save Data
P4 - Access to combustion power / Menu Increase
P5 - Enable chrono time slot /Access to the Info Menu
P6 - Access to Room ermostat / Boiler ermostat / Menu Decrease
G- Daily Chrono on / S- Weekly chrono on / FS - Week End Chrono On
DHW demand or buer tank thermostat not reached
Local room heating target reached
P3 + P5 - Direct access to the Secondary Information menu inside the Service menu. (push for 3 seconds)
USER MENU 1
Power - Pellet Menu to modify the combustion power of the system in Pellet mode. It is possible to set it
in auto or manual mode: in the rst case the system chooses the power combustion, while in the second
one, the user selects the power. On the le of the display the combustion mode is reported (A= automatic
combustion, M=manual combustion) and the system working power.
ermostats
Boiler - Menu to modify the Boiler ermostat value. You can program the minimum and maximum value
by setting the ermostats 26 and 27. With climatic function switched on the thermostat value cannot
be modied, because it is automatically computed by the system.
Buer Tank - Menu that allows to modify the Buer tank ermostat value; it is shown if; it is displayed if a
hydraulic plant requiring it has been selected.
DHW - Menu to edit the DHW thermostat value.
CHRONO
This Manu allows selecting the programming modalities and and the Ignition/Extinguishing time slots.
Disable
Daily
Weekly
Week - End
Modality - It allows selecting the disired modality, or disable all set programming.
1. Enter modication mode through the key P3.
2. Select the chosen modality (Daily, Weekly or Week end).
3. Enable/disable chrono modality through the keys P2.
4. Save the settings through the keys P3.
Programming
The system includes three type of programming: Daily, Weekly, Week end.
After selecting the desired kind of programming:
1. Select the programming time through the keys P4/P6.
2. Enterthe adjustment modality (selected time will be ashing) through the keys P3.
3. Change the time via keys P4/P6.
4. Save the programmong with the keys P3.
5. Enable (a “V” is displayed) or disable the time slot (a“V”is not displayed”) by
pressing the keys P5.
Daily
Select the day of the week to program and set the ignition and extinguishing times.
Programs around midnight
Set the clock On of the previous day at the desired time: Ex. 20.30
Set the clock of OFF of the previous day at: 23:59
Set the clock On of the following day at 00:00
Set the clock of OFF of the following day at the desired time: Ex. 6:30
The system turns on at 20.30 on Tuesday and turns o at 6.30 on Wednesday
Weekly
The programs are the same for all days of the week.
Week-end
Choose between 'Monday-Friday' and 'Saturday-Sunday' and then set the switching
on and o times.
Monday
ON OFF
09:30 11:15 V
00:00 00:00
00:00 00:00
Monday____________
Tuesday
Wednesday
Thrusday
Friday
Mon-Fri
Sat-Sun
USER MENU 2
Menu is accessed by pressing the P3 buttons for 3 seconds .
Settings
Time and Date - Used to set the day, month, year and current time.
Language - Menu to modify the language of the LCD board.
Display Menu
Contrast - Menu used to regulate the display contrast.
Brightness - It allows you to adjust the screen brightness.
Minimum Brightness - Menu used to regulate the lighting of the display when the command aren’t used.
Keyboard Address - This Menu is protected by a password (the password is 1810), that allows you to set the RS485
node address. With the bus 485 it is not possible to have more nodes with the same address.
Sound - It allows you to enable or disable sound from the control panel.
Node List - This menu shows: communication address of the board, typology of the board, rmware code and
rmware version. Data are not modiable. The typologies of board that can appear are:
MSTR - Master; INP - Input; KEYB - Keyboard; OUT - Output;
CMPS - Composite; SENS - Sensor; COM - Communication;
Acoustic Alarm - It allows to enable or disable the acoustic alarm of the keyboard.
Auger Calibration - It allows to modify the value set in rm of Auger’s speed or On times. The values are in the
range – 7 ÷ 7. The rm’s value is 0.
Fan Calibration - It allows to modify the value set in rm of Combustion Fan’s speed. The values are in the range
– 7 ÷ 7. The rm’s value is 0.
Summer-Winter - This Menu allows you to modify the hydraulic plant functioning depending on the season.

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Mareli Systems
CHRONO
This Manu allows selecting the programming modalities and and the Ignition/Extinguishing time slots.
Disable
Daily
Weekly
Week - End
Modality - It allows selecting the disired modality, or disable all set programming.
1. Enter modication mode through the key P3.
2. Select the chosen modality (Daily, Weekly or Week end).
3. Enable/disable chrono modality through the keys P2.
4. Save the settings through the keys P3.
Programming
The system includes three type of programming: Daily, Weekly, Week end.
After selecting the desired kind of programming:
1. Select the programming time through the keys P4/P6.
2. Enterthe adjustment modality (selected time will be ashing) through the keys P3.
3. Change the time via keys P4/P6.
4. Save the programmong with the keys P3.
5. Enable (a “V” is displayed) or disable the time slot (a“V”is not displayed”) by
pressing the keys P5.
Daily
Select the day of the week to program and set the ignition and extinguishing times.
Programs around midnight
Set the clock On of the previous day at the desired time: Ex. 20.30
Set the clock of OFF of the previous day at: 23:59
Set the clock On of the following day at 00:00
Set the clock of OFF of the following day at the desired time: Ex. 6:30
The system turns on at 20.30 on Tuesday and turns o at 6.30 on Wednesday
Weekly
The programs are the same for all days of the week.
Week-end
Choose between 'Monday-Friday' and 'Saturday-Sunday' and then set the switching
on and o times.
Monday
ON OFF
09:30 11:15 V
00:00 00:00
00:00 00:00
Monday____________
Tuesday
Wednesday
Thrusday
Friday
Mon-Fri
Sat-Sun
USER MENU 2
Menu is accessed by pressing the P3 buttons for 3 seconds .
Settings
Time and Date - Used to set the day, month, year and current time.
Language - Menu to modify the language of the LCD board.
Display Menu
Contrast - Menu used to regulate the display contrast.
Brightness - It allows you to adjust the screen brightness.
Minimum Brightness - Menu used to regulate the lighting of the display when the command aren’t used.
Keyboard Address - This Menu is protected by a password (the password is 1810), that allows you to set the RS485
node address. With the bus 485 it is not possible to have more nodes with the same address.
Sound - It allows you to enable or disable sound from the control panel.
Node List - This menu shows: communication address of the board, typology of the board, rmware code and
rmware version. Data are not modiable. The typologies of board that can appear are:
MSTR - Master; INP - Input; KEYB - Keyboard; OUT - Output;
CMPS - Composite; SENS - Sensor; COM - Communication;
Acoustic Alarm - It allows to enable or disable the acoustic alarm of the keyboard.
Auger Calibration - It allows to modify the value set in rm of Auger’s speed or On times. The values are in the
range – 7 ÷ 7. The rm’s value is 0.
Fan Calibration - It allows to modify the value set in rm of Combustion Fan’s speed. The values are in the range
– 7 ÷ 7. The rm’s value is 0.
Summer-Winter - This Menu allows you to modify the hydraulic plant functioning depending on the season.
USER MENU 2
Settings
Time and Date - It allows you to set day, month, year and current time.
Language - It allows you to modify the language of the keyboard.
Recipe - Menu for the selection of the combustion recipe.
Summer/Winter - Menu to edit the functioning of the hydraulic system according to the season.
Service
Counters - Ignitions (Number of attempted Ignitions) - Failed Ignition (Number of failed ignitions) -
Working hours (Operating hours in Run mode, Modulation and Safety).
Errors List - e menu shows the last 10 errors; in each line the error code and time/date of the error itself
are shown.
Secondary Information - Information about congurable outputs and inputs are only available if they have
been set.
Cleaning Reset - Menu to reset the function ‘System Maintenance 2’. It is displayed only if T67>0.
Auger Calibration - is menu allows you to modify the default values of the Auger speed or its On times.
You can set the values in a range within –7÷7. e default value is 0.
Fan Calibration - is menu allows you to modify the default values of the Combustion Fan speed. You can
set the values in a range within –7÷7. e default value is 0.
Mixer Valve - Menu to manage the Mixer Valve operation.
Automatic Power - is menu allows you to set combustion power in automatic mode only. If you set it,
power change menus are no longer displayed.
Loading - e procedure enables the pellet manual charge and it is automatically interrupted aer 300
seconds. In order to enable this function, the system must be on mode O.
Loading Test - e procedure allows calculating the amount of pellet used in 10 minutes with the auger.
Display
Contrast - It allows you to adjust the screen contrast.
Screen saver - is Menu allows the user to enable and disable the screen saver.
Acoustic Alarm - Menu to enable/disable the acoustic alarm.
Minimum Brightness - It allows you to adjust the screen brightness when not using the controls.

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The main frame shows:
time and date, chrono activation, combustion
power and recipe, functioning state, error code,
main temperature, main thermostat,
summer/winter mode.
Button
Function
P1
P2
P3
P4
P5
P6
Exit Menu/Submenu;
Ignition and extinguishing (push for 3 seconds), Reset errors (push for 3 seconds), Enable/disable chrono;
Enter in User Menu 1/submenu, Enter in User Menu 2 (push for 3 seconds), Save data;
Enter in Visualizations Menu, Increase
Activation chrono time band
Enter in Visualizations Menu, Decrease
Led
Function
D1
D9
D2
D10
D3
D11
D4
D12
Igniter ON
Auger ON
Pump 1 ON
V2: Pump 2 ON
External Chrono reached
Lack of pellet
Local Room Thermostat reached
Sanitary water demand
Er01 - Return ame safety activated;
Er02 - Water overheating safety activated;
Er03 - Extinguishing for low exhaust temperature or missing light in the brazier;
Er04 - Extinguishing for water over temperature;
Er05 - Extinguishing due to high exhaust temperature;
Er06 - Pellet Thermostat open (ame return from the brazier);
Er07 - Encoder Error. The error may occur due to lack signal from Encoder;
Er08 - Encoder Error. The error can occur due to problems of adjustment of the number of revolutions;
Er09 - Water pressure low;
Er10 - Water pressure high;
Er11 - Clock Error. The error occurs due to problems with the internal clock;
Er12 - Extinguishing for ignition failure;
Er15 - Extinguishing due to power failure for more than 50 minutes;
Er16 - RS485 communication error (Display);
Er17 - Adjusting the Air Flow Failed;
Er18 - No more Pellet in the bunker;
Er23 - Boiler probe or Back boiler probe or probe Buer open;
Er25 - Engine cleaning brazier broken;
Er26 - Engine cleaning broken;
Er27 - Engine cleaning 2 broken;
Er39 - Sensor Flowmeter broken;
Er41 - Minimum air ow in Check Up is not reached;
Er42 - Maximum air ow exceeded;
Er44 - Open door error;
Er47 - Error Encoder Auger: missing signal Encoder;
Er48 - Error Encoder Auger: Auger regulation speed not achieved;
Er52 - Error Module I/O I2C;
Er57 - Test ’Forced Draught High’in Check Up fail;
Service - Service error. It noties that the planned hours of functioning is reached. It is necessary to call for service.
ALARMS
CONTROL PANEL: USE AND FUNCTIONS
Description
Code
PRob
Hi
Clean
Port
Ignition
block
Cleaning on
Link Error
Anomaly of the probes checking, during Check Up phase.
Room temperature greater than 99 °C.
This message noties that the planned hours of functioning (parameter T67) are reached.
Door Open.
The message appears if the system is turned o during Ignition (after Preload) not manually:
the system will stop only when it goes in Run Mode.
Periodical Cleaning in progress.
No communication between motherboard and keyboard
MESSAGES
Exhaust T. [°C] - Exhaust temperature;
Room T. [°C] - Room Temperature ; it is displayed only if an input has been set as a Room Probe;
Boiler T. [°C] - Boiler Temperature;
Buffer T. [°C] - Buer Temperature, it is visible only if P26 is set on 2,3,4;
Pressure [mbar] - Water pressure;
Air Flux - Air ow; it is visible only if A24 is dierent from 5;
Fan Speed [rpm] - Exhaust fan speed; it is visible only if P25 is dierent from 0;
Auger [s] - Auger work time; it is visible only if P81 is equal to 0;
Recipe [nr] - Combustion recipe set; it is visible only if P04 is greater than 1;
Product Code: 510 - Product code;
VISUALIZATIONS
USER MENU 1
Combustion Management
Power - In this menu is possible to modify the combustion power of the system. It can be set in automatic or
manual modality . In the rst case the system chooses the combustion power. In the second case the user selects
the desired power. On the left side of the display are signalled the combustion modality (A=automatic combustion,
M=manual combustion) and the working power of the system.
Recipe - Menu to select the combustion recipe. The maximum value is the number of recipes visible to the user.
Heating Management
Boiler thermostat - Menu to change the value of the boiler thermostat .
Buffer thermostat - Menu to change the value of the Buer Thermostat; it is only visible if a plumbing plan with a
Buer is selected.
Room Thermostat - This Menu allows to modify the Local Room Thermostat’s value. It is visible only if the ambient
probe is select.
Summer-Winter - Menu that allows the selection Summer-Winter.
Manual Load
The procedure activates the pellet manual loading with activation in continue modality of the Auger engine. The
loading is stopped automatically after 600 seconds. The system must be OFF for the function can be activated.
Cleaning Reset
Menu to reset the ‘System Maintenance 2’function.

17
Mareli Systems
FUSE
1 2N
L
LINEA
3 4FF
NN
V1
5 6FF
NN
V2
7 8FF
NN
V3
9
10FF
NN
A1
11
12FF
NN
C
15
14
13
H1H2
16 17
A2
N
F
18
OFF
FON
20
21
A3
COM
N.C.
22N.O. 19F
23
24
A4
N
FON
25COM
26N.O.
A5
28 27 PW1
GND
30 29 PW1
GND
32 31 -
+
34 33 IN2
GND
36 35 IN3
GND
38 37 IN4
GND
41 40 GND
+V
39 IN5
43 42 +Vc
+V
45 44 IN6
GND
47 46 IN7
GND
49 48 IN8
GND
51 50 IN9
GND
53 52 IN10
GND
55 54 IN11
GND
57 56 IN12
GND
59 58 IN13
GND
POWER
CABLE
COMBUSTION
FAN
IGNITER
AUGER
PROTECTION
RETURN FLAME
PUMP 2
MOTOR FOR
CLEANING
MECHANISM
PUMP 1
RELAY FOR
CLEANERS
MECHANISM
16
N
EXHAUST
PROBE
ROOM
THERMOSTAT
DHW PROBE
BOILER
PROBE
DISPLAY
AUGER 2
PHOTOSENSOR
BUFFER HIGH PROBE
BUFFER LOW PROBE
VACUUM SENSOR
RED
BROWN
BLACK
COMBUSTION
FAN 2
DIAGRAM FOR SMB 50 KW ROTARY (NG21)

18
Mareli Systems

MARELI SYSTEMS disclaims any responsibility for possible inaccuracies contained in this manu-
al if they are due to printing or transcription errors. We reserve the right to make any change that
appears to be necessary or useful without harm the essential characteristics.
Mareli Systems
Mareli Systems
Industrial Zone
Simitli, 2730
Region Blagoevgrad
Bulgaria
[e-mail]
www.mareli-systems.com
IMPORTANT !!!
1. e outlet temperature always has to be over 60°C. is can be reached by obligatory
connection of the 3-way thermic valve which blocks the boiler temperature from falling
under the 60°C level.
! !
! !