Mareli Systems CB 25 User manual

Combined Boiler MARELI “CB 25/35/48”
Assembly and exploitation manual
Mareli Systems

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Mareli Systems
• “Mareli Systems” expresses its gratitude towards the clients who purchased the manufactured products.
• “Mareli Systems” provides the present manual as an aid to the team, which will install, adjust and main-
tain the device, as well as to the client which will exploit it.
• “Mareli Systems” requires that the technicians who will carry out the above mentioned procedures have
passed a training course on the activities, associated with this product.
ATTENTION! For Your safety, it’s necessary to read carefully this manual as well as the exploitation and instal-
lation manual of the automated pellet burner before attempting any installation, adjustment and exploitation
activities. Also read the installation and exploitation manual of the pellet bunker if the device is provided with
one. e non-fulllment of prescriptions and violation of active regulations and directives may lead to damage
and unexpected consequences for which “Mareli Systems” accepts no responsibility.
1. Description and advantages of the Combined Boiler “CB 48 Kw”
e Combined Boiler of this series are designed to uti-
lize solid fuel (wood, coals). It has a welded steel con-
struction. e resulting heat is absorbed by the heat ex-
change surface of the boiler body and transmitted the
heating system. ese boilers used for heating in local
heating systems, but also for heating domestic water.
Automated pellet burner is part of the system and can
utilize the following types of fuel: Wood pellets size 6
and 8 mm Class A;
e full set consists of:
• Water heating boiler, representing a steel heat ex-
changer for warming up the heat conductor;
• Automated pellet burner equipped with a control
panel;
e system consists of:
• Water heating boiler (the boiler is equipped
with two doors depending on the type of fuel
that is going to be used);
e heating boiler consists of:
• Steel body;
• ermal regulator;
• Door for mounting a burner;
• ermometer/manometer;
e desired temperature of the boiler water is ad-
justed with the regulator and is maintained at this
maximal value.
e airow is controlled by a valve (connected to
the regulator). At the back there is a compartment
that contains the ash residue.
e thermometer/manometer indicates the temper-
ature in the heating boiler and the water pressure.
2. Description of the system: water heating boiler heat exchanger

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e boiler consists of the following elements:
• e heat exchanger comes in a two-door kit which is used depending on the fuel type(available for
mounting the pellet burner);
• e heat exchanger is a welded construction made of steel sheet material. In the front lower part there
is a furnace chamber and underneath the ash container is placed. e heat exchanger is compact and
constructively based on a triple-motion principle, which enables an optimal heat exchange and high
eciency;
• e ceramic elements mounted in the combustion chamber ensure an optimal burning process and a
complete combustion of the fuel;
• e ash tray is situated on the bottom of the combustion chamber. ere the remaining ash is gathered
and it allows for easy cleaning of the device;
• e incoming and outgoing connector for feeding and the unloading water are situated in the rear part of
the boiler and represent two terminals with an outer thread G1½ through which the device is connected
to the heating system;
• e drainage hole is a terminal with a G1/2 thread upon which an unloading valve is to be mounted;
• e funnel (with an outer diameter of F145) is situated in the upper rear part of the boiler, and leads o
the smoke gasses through the chimney;
• e steel heat exchanger is isolated with mineral isolation which reduces the environmental thermal
losses;
• e outer decorative walls are made of steel sheet iron and are worked with a high quality colour layer;
Maximal Capacity
kW
24
32
48
Effective Heating
m3
Max.500
Max.700
Max.1100
Height Н
mm
988
1138
1138
Width W
mm
530
530
580
Depth D
mm
641
675
792
Fume Exhaust Outlet
Φmm
150
150
180
Weight
kg
215
265
325
Fuel
Pellets/Solid fuel
Pellets/Solid fuel
Pellets/Solid fuel
Chimney Draft
Pa
20
20
20
Volume of the water chamber
litr
62
78
95
Max. working pressure
bar
0,5-2,0
0,5-2,0
0,5-2,0
Working environmental temperature
º C
5º - 40º
5º - 40º
5º - 40º
Efficiency
%
> 92%
> 91%
> 90%
CO Emissions
Mg/m3
<500
<500
<500
Temperature of the flue gas
º C
135
155
170
e water heating boiler is manufactured with a two-door kit
(le and right) depending on the fuel that is to going be used.
e door with an air valve is used for solid fuel (wood, coals).
e valve is connected to the thermal regulator with a chain and
thus controls the boiler temperature. e precise adjustment of
the regulator is done on start up of the unit.
e door that is designed for the burner has an opening, in
which it is mounted with M6 screws. Aer the burner is mount-
ed, a steady tightening of the screws must be done so the isola-
tion between the burner’s ange and the boiler’s door is secured.
Basic information about the operation of the boiler:
• e thermal output on which the burner is set;
• e degree of impurity of the boiler’s heating surfaces;
• e degree of insulation on the door and the lids of the
boiler’s combustion chamber (the condition of the insu-
lating ropes)
• e power chimney dra;

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3.Transport and assembly of the heating boiler
If possible, transport the heating boiler without unwrapping it. Keep it on the pallet to the point of unloading.
Unwrap in an ecologically clean manner. Respect, construction and ventilation requirements, especially the
active norms for burning devices and storing of burning materials in the room where the unit will be installed.
e minimal distances between the wall and the boiler must be at least of 600 mm. e minimal space in front
of the boiler must be of 1000 mm. e reproof surface for assembly as well as the foundation must be even
and horizontal. Put reproof wedges if needed. If the foundation is not even, the side with the connections (the
rear side) may be placed 5 mm higher in order to optimize for ventilation and ow.
e foundation must be bigger than the base of the heating boiler. At least 300 mm from the front side and
100 mm from the rest of the sides.
e water heating boiler must be connected to the heating installation and to the chimney, following the
respective requirements. For the proper and safe functioning of the boiler a levelling is required so that good
airow is ensured.
Attention!!! Fire risk due to ammable materials and liquids.
• Make sure no ammable materials and/or liquids are in the vicinity of the heating boiler.
• Indicate the user of the installation the minimal distances to ammable and non-ammable materials.
Installing the heating boiler
e installation of the heating boiler will be explained here. In details this is:
• Making the connection with the chimney
• Hydraulic connection
• Connecting the feeding/unloading valve
• Connecting the safety heat exchanger
• Filling the heating installation and density check
4.Instructions for connecting the air supply and exhaust gases
Making the connection with the chimney
Keep in mind that the connection of the heating boiler to the chimney must be performed with rules of local
construction control in mind and the approval of a chimney sweeper.
A chimney with a good dra is the main precondition for the proper functioning of the heating boiler. e
power and economy are greatly inuenced by it. e heating boiler can be connected only to a good dra
chimney.
• Install a connection to the exhaust gas with an inspection hole for cleaning.
• If possible, the exhaust gas pipe should be short and inclined from the heating boiler upwards to the
chimney.
• Mount very carefully the exhaust gas pipe which stands freely in the chimney and place rmly the
orice.
• Attach additional pipes with length over 2 m. All parts of the exhaust gas pipe must consist of non-am-
mable materials.
Attention!!! Suocation hazard due to lack of oxygen in the installation room.
• Ensure sucient fresh air supply through holes out.
• Risk of injury/damage to equipment due to lack of combustion air can lead to tar and noxious gas
formation.
• Ensure sucient fresh air supply through holes out.
• Notify the user of the installation that these holes must remain open.
Hydraulic joints making
Instruction!!!
Damaging the installation due to non-isolated joints.
Install the connecting pipes without tension to the boiler joints.
e gure shows the connection of the exhaust gases. 1 – dra
stop.
Info: For low exhaust gases condensation and prolonged life,
we recommend equipping the heating boiler with a device for
increasing the backward temperature. is prevents reducing
of the temperature of the boiler’s water below 65º С (point of
combustion irrigation).

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Connecting the safety heat exchanger
In the countries where the EN 303-5 is in force, the
heating boiler must be provided with overheating
protection. By doing so the maximum water tem-
perature of 100º С won’t be exceeded (overheating
protection).
e minimal working pressure of the water must be
equal to 2 bar (the maximum – to 6,0 bar). ere
must be an available capacity of at least 11 l/min.
• Connect the safety heat exchanger according to
the hydraulic chart with a thermal safety switch
(accessories).
• Mount a lter in the ow of cooling water to the
thermostatic valve.
Filling the heating installation and insulation
check
Check insulation before putting the installation into
operation in order to ensure that no leaks are present.
Exercise upon the heating boiler a pressure equal to
1,3 of the allowed working pressure (keep in mind
the safety pressure of the safety guard valve).
Instruction!!! Installation damage due to freezing.
• If the heating installation and the pipe network are not constructed with anti-freezing protection, we
recommend lling the installation with liquid with a low freezing point and anti- corrosion and an-
ti-freezing agent.
• Installation damage due to excessive pressure during the insulation test. Pressure devices, regula-
tors and safety switches may be damaged due to high pressure.
• Make sure that during the insulation test no pressure devices, the joints to the water tank of which can-
not be closed, are mounted.
• Close the connection between the enlarging pot and the system by closing the valve.
• Open the mixing and the stopping valves from the water heated side.
• Connect the tubing to the water valve. Place a hose full of water on to the hose socket of the loading and
unloading valve, secure it with a clamp and open the loading and unloading valve.
• Turn the cap of the automated air tighten-er one full spin so the air can be pumped out.
• Slowly ll the heating installation. During this process watch the pressure indication (manometer).
• When the desired working pressure is reached close the water valve and the loading and unloading valve.
• Check the insulation of the connections and the pipes.
• Pump the air out of the heating installation via the air tightening radiator valves.
• If aer the air tightening the working pressure decreases additional water must be lled in.
• Release the hose from the loading and unloading valve.
Ensuring the temperature of return water
For normal operation, the return water temperature should not drop below 55ºC. erefore a thermostatic
mixer to raise the temperature of return water must be mounted to the reverse heating pipe.
Establishing operating pressure
To start you need to establish normal operating pressure
Instruction!!! Installation damages due to pressure in the material as a consequence of temperature dierences.
• Fill the heating installation in cold condition only (the maximum incoming temperature can be 40º С).
Attention!!! Hazard to life in case of non-observation of the safety prescriptions

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• Set the red arrow to gauge the correct pressure of at least 1 bar overpressure (valid for closed systems).
In open systems the maximum water level in expansion tank is 25 m above the bottom of the boiler.
• Add and relief water in the heating network through the loading and unloading valve until the desired
working pressure is reached.
• During the lling process make sure the heating installation is air tightened.
Adjustment of the reducing valve of the exhaust gas pipe
e reduction valve of the exhaust gas pipe must be adjusted according to the exhaust gas installation and the
fuel type. In open position (the lever is horizontal to the exhaust gas pipe) a higher temperature of the exhaust
gases can occurs, but with lower energy conversion eciency. Inform and explain the adjustment to the user
of the unit.
Servicing the heating installation (for user)
5.Functions of the separate elements
Ignition valve
e ignition valve of the water heating boiler is
placed in an inclined position. By doing so the con-
nection of the heating gas ow is short circuited in
order for the hot gases to reach the chimney faster
and for a greater chimney dra.
• For this purpose, push the valve lever back-
wards.
In a normal functioning mode (ignition valve in
horizontal position) the hot gas warms the incom-
ing gas ow and this results in better gas eciency.
• For this purpose, pull the valve lever at the
rear side of the heating boiler to a vertical po-
sition (aer 10-15 minutes).
Info: An excessive air supply may extinguish the
ame due to the excessive forming of gas prod-
ucts from the combustion. In this case a re-ad-
justment of the air supply is needed.
Cleaning the heating boiler
Empty the ash container before it is fully lled in
order to ensure air ow from bellow.
Attention!!! Fire risk due to hot ashes.
• If the ashes are still hot wear protective gloves.
• Empty the ashes in non-ammable pot with lid
Cleaning the heating boiler
e soot and ash accumulation on the walls deriving from the gas reduce the heat conduction. Precipitation,
tar accumulating and condensation depend on the fuel type that is used (for example wood forms greater
quantity than coals), chimney’s dra and the working mode. We recommend cleaning at least once a week in
a cold state of the system.
Instruction!!! Inecient operation
• Due to insucient cleaning the fuel consumption may increase which may lead to environmental pollu-
tion. Clean the heating boiler at least once a week.
• Clean the walls of the combustion chamber carefully in order to avoid damage to the re-clay bricks.
• If the lid doesn’t come o this means that the chamber is covered with tar. Hit the cleaning lid cautiously
with a hammer several times.
• Clean the walls of the heating surfaces, the combustion chamber and the reserve fuel chamber with a
cleaning scoop.
• Clean the grills with an ash knife.
• Gather the soot and the ashes in the ash container.
• We recommend annual revision of the heating boiler, performed by an authorized heating rm and
check of the system’s technical data, for example exhaust gas temperature.
• Open the lling valve and the top plate.
• Pull the ignition valve. is ensures the gas access to the paths and walls of the heating boiler.
• Pull out the lid of the cleaning hole from the combustion chamber so the combustion waste can fall freely
in the ash container.

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• If the lid doesn’t come o this means that the chamber is covered with tar. Hit the cleaning lid cautiously
with a hammer several times.
• Clean the walls of the heating surfaces, the combustion chamber and the reserve fuel chamber with a
cleaning scoop.
• Clean the grills with an ash knife.
• Gather the soot and the ashes in the ash container.
• We recommend annual revision of the heating boiler, performed by an authorized heating rm and
check of the system’s technical data, for example exhaust gas temperature.
• Open the lling valve and the top plate.
• Pull the ignition valve. is ensures the gas access to the paths and walls of the heating boiler.
• Pull out the lid of the cleaning hole from the combustion chamber so the combustion waste can fall freely
in the ash container.
6. Using the turbulator plate
e turbulator plate creates vortex in the paths of the heating gas and thus
resulting in higher eciency, especially during the winter. In the begin-
ning of the heating season and during the intermediate seasons we recom-
mend removal of the turbulator plate of the heating boiler
• At -7º С outer temperature re-install the turbulator plate into the
heating boiler.
Shutting down the heating boiler
To shut down the boiler let the re to extinguish completely. Acceleration
of the process is not recommended.
Instruction!!! Installation malfunction due to freezing.
When the heating installation is not operating it may freeze due to low
temperatures.
• If possible, leave the heating installation constantly running.
• Protect the heating installation from freezing by eventually draining
the heating installation on the lowest point.
Temporary shut-down of heating boiler
• Clean the grill and empty the ash container.
• Clean the supporting surfaces of the loading valve and the ash cham-
ber.
• Close the ash door and the loading valve.
Long term shut-down of the heating boiler
For a long term shut-down of the heating boiler (for example in the end of the heating season) carefully clean
the heating boiler in order to avoid corrosion.
Emergency shut down of the heating boiler
In case of explosion hazard, re, burning gases or vapours the combustion process can be terminated by using
water.
• Carefully open the loading door in order to avoid incoming ames.
• Extinguish the re with water.
Avoiding condensation and tar forming
Excessively low heating output may lead to condensation upon the heating surfaces.
e condensation is leaking down into the ash container.
• Check the indications of the thermometer/manometer to ensure that the working temperature of the
boiler water remains above 65º С.
• Heat up the heating boiler multiple times. Remove the turbulator plate for the purpose. By the soot accu-
mulation, which is formed during a normal operating process, the condensation risk reduces.

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e point of irrigation of the burning products is at 65º С and for this reason the products temperature on the
heating surfaces must not drop below 65º С
If in the fuel reserve chamber condensation is formed, that indicates the presence of excessively high water
content in the fuel (humid fuel). In such cases condensation may occur even at boiler water temperatures
above 65º С
e tar is formed in similar circumstances (low output, low temperature) and also in wrong combustion ad-
justment – too little oxygen. e tar accumulates on the bottom of the gas paths and impedes the removal of
the cleaning lid.
e tar can be cleaned in warm state only. For the purpose do as follows:
• It is best to heat up the boiler with some so wood.
• When a 90º С temperature is reached close all valves of the heating components.
• Pull out the cleaning lid and hit several times with hammer.
• Remove the tar from the oor and the heating surfaces with a cleaning scoop.
7. Inspection and maintenance of the heating boiler
Why regular maintenance is important?
ese are the reasons why a regular maintenance of the heating installations is required:
• To keep a high energy conversion eciency and to ensure an economic functioning of the heating in-
stallation (low fuel consumption);
• Ensuring a high operational safety;
• Ensuring a high ecological combustion;
Oer Your client an annual contract for revision and maintenance. Use original spare parts only.
Cleaning the heating installation
• Check the heating boiler and clean if needed.
• Check and clean the exhaust gas pipe.
Heating installation pressure check
e pointer of the manometer must be above the red one. e red pointer of the manometer must be set to the
required working pressure.
Info: Set a working pressure of at least 1 bar.
• Check the working pressure of the heating installation. If the manometer pointer is under the red point-
er, then the working pressure is too low. Water must be added.
Instruction!!! Installation malfunctions due to frequent water adding.
When a frequent water addition is performed, depending on the condition of the water, the heating installa-
tion can be damaged due to corrosion and limestone accumulation.
• Ensure that the heating installation is air tight;
• Check the insulation of the heating installation and the capability of the enlarging pot;
• Installation malfunctions due to tension in the material from to temperature dierences.
• Fill the heating installation in a cold state only (the incoming temperature must not be exceeding 40º С).
• Add water through the loading and unloading valve.
• Air tight the heating installation.
• Check the working pressure again.
8. ermal safety of the ow check
e thermal safety guard of the ow ensures a safe functioning of the heating boiler in case of system failure
if the system cannot lead the heat of the heating boiler out by itself. A malfunction may occur, for example,
in case of a frozen heating system, water circulation failure etc. For proper functioning of the thermal safety
guard a sucient pressure and cooling water are required. Pressure of at least 2 bar and a 11 l/min water debit
is required.
• Check the thermostatic valve of the safety heat exchanger annually according to the manufacturer’s data.
If the check was not successful – the thermostatic valve doesn’t open the ow of the cooling water, or the per-
meability of the thermostatic valve is too low – you must replace the thermostatic valve.
Troubleshooting
In case of malfunction attempt repair or inform the heating specialist. As a user of the installation you can only
attempt maintenance activities like changing parts of the grills, the re-clay bricks or the insulation tape. Use
original spare parts only.

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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
Er01 - Security Error High Voltage 1. It may also intervene with the system o;
Er02 - Security Error High Voltage 2. It can only intervene if the Combustion fan is active;
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;
Er34 - Depression below the minimum threshold;
Er35 - Depression above the maximum threshold;
Er39 - Sensor Flowmeter broken;
Er41 - Minimum air ow in Check Up is not reached;
Er42 - Maximum air ow exceeded (F40);
Er44 - Open door error;
Er47 - Error Encoder Auger: missing signal Encoder (if P81=1 or 2);
Er48 - Error Encoder Auger: Auger regulation speed not achieved (if P81=1 or 2);
Er52 - Error Module I/O I2C;
Er57 - Test ’Forced Draught High’ in Check Up fail (FL70);
Service - Service error. It noties that the planned hours of functioning (parameter T66) is reached. It is necessary to call for service.
ALARMS
CONTROL PANEL: USE AND FUNCTIONS
D1 - Heating Resistance;
D2 - Auger 1;
D3 - Pump 1;
D4 - Valve or Pump 2;
D5 - Auger 2;
D6 - Motor for cleaning engine;
D7 - Relay for cleaning engine;
D9 - External Chrono reached;
D10 - Lack of pellet;
D11 - Local Room Thermostat reached;
D12 - Sanitary water demand;
LED

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Description
Code
Sond
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 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] - Local room temperature; it is visible only if;
Buer T. [°C] - Buer Temperature;
Pressure [mbar] - Water pressure;
Air Flux - Air ow;
Fan Speed [rpm] - Exhaust fan speed;
Auger [s] - Auger work time;
Recipe [nr] - Combustion recipe set;
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.
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.
Heating Management
Boiler thermostat - Menu to change the value of the boiler thermostat .
Buer thermostat - Menu to change the value of the Buer Thermostat.
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.

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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 .
Keyboard Settings
Time and Date - Used to set the day, month, year and current time.
Language - Menu to modify the language of the LCD board.
Keyboard Menu
Set Contrast - Menu used to regulate the display contrast.
Set Minimum Light - Menu used to regulate the lighting of the display when the command aren’t used.
Keyboard Address - It allows to change the address of the RS485 node. In the RS485 bus it is not possible to
have more nodes with the same address. It is possible to congure the keyboard as local or remote by changing
the address (16 for local , 17 for remote).
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.

12
Mareli Systems
WIRING DIAGRAM SMB 50 ;

13
Mareli Systems
WIRING DIAGRAM SMB 35 ;

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15
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
Industrial Zone
Simitli, 2730
Region Blagoevgrad
Bulgaria
[e-mail]
www.mareli-systems.com
Mareli Systems