THERMOSTAHL MULTIPLEX MCL Manual

SOLID FUEL BOILER
MULTIPLEX MCL
INSTALLATION AND SERVICE MANUAL
VERSION:
2.1
UPDATE:
11.05.2013

Contents
1. GENERAL INFORMATION ................................................................................... 3
1.1. Proper use of the appliance ................................................................................ 3
1.2. Safety warnings ................................................................................................ 3
1.3. Data label ........................................................................................................ 3
1.4. Document information ....................................................................................... 3
2. TECHNICAL FEATURES AND DIMENSIONS ......................................................... 4
2.1. Technical features ............................................................................................. 4
2.2. Function principle .............................................................................................. 4
2.3. Dimensions ...................................................................................................... 5
2.4. Fuel................................................................................................................. 7
3. BOILER MOUNTING ........................................................................................... 9
3.1. Transportation and delivery ................................................................................ 9
3.2. Boiler room ...................................................................................................... 9
3.2.1. General requirements .................................................................................. 9
3.2.2. Boiler room dimensions.............................................................................. 10
3.3. Mounting instructions ...................................................................................... 11
3.3.1. Fan ......................................................................................................... 11
3.3.2. Control panel............................................................................................ 11
3.4. Chimney ........................................................................................................ 13
4. INSTALLATION ................................................................................................ 14
4.1. Hydraulic connections ...................................................................................... 14
4.2. Safety features ............................................................................................... 14
4.3. Overheating serpentine.................................................................................... 15
4.4. Return temperature protection.......................................................................... 15
4.5. Filling the system ............................................................................................ 16
4.6. Connection diagrams ....................................................................................... 17
4.6.1. Open expansion vessel connection .............................................................. 17
4.6.2. Closed expansion vessel connection............................................................. 18
5. ELECTRICAL CONNECTIONS ............................................................................ 19
5.1. General instructions......................................................................................... 19
5.2. Control panel functions .................................................................................... 19
5.3. Wiring diagram ............................................................................................... 20
6. BOILER START-UP ........................................................................................... 21
6.1. Initial lighting checks ....................................................................................... 21
6.2. Start-up ......................................................................................................... 21
6.3. Checks to carry after initial start-up .................................................................. 21
6.4. Fuel loading.................................................................................................... 22
6.5. Combustion regulation ..................................................................................... 22
6.6. Chimney damper adjustment ............................................................................ 22
7. SERVICE AND MAINTENANCE .......................................................................... 23
7.1. Cleaning the boiler .......................................................................................... 23
7.2. Cleaning the chimney box ................................................................................ 24
7.3. Maintenance intervals ...................................................................................... 24
7.3.1. Daily maintenance..................................................................................... 24
7.3.2. Weekly maintenance ................................................................................. 24
7.3.3. Monthly maintenance................................................................................. 24
7.4. Basic service procedures .................................................................................. 25
7.4.1. Service after overheating ........................................................................... 25
7.5. Maintenance after long stop.............................................................................. 25
8. TROUBLESHOOTING ........................................................................................ 26
9. WARRANTY...................................................................................................... 27

GENERAL INFORMATION
3
1. GENERAL INFORMATION
1.1. Proper use of the appliance
Before you make use of this appliance make sure you have read and fully understood the
instructions included in this manual.
The installation and use of the appliance must be performed according to the instructions
indicated in this manual in combination with the current national safety regulations.
The appliance is designed for use in pumped hot water central heating systems. Any other use
is considered improper and is prohibited. THERMOSTAHL declines any responsibility for
damages or injuries caused by improper use; in this case the risk is completely at the user’s
responsibility.
To ensure an efficient and flawless function of the appliance, it is strongly recommended that
you have performed an annual service by a qualified technician.
1.2. Safety warnings
All installation and maintenance procedures must be carried out by professional and authorized
personnel, in compliance with the indications in the present manual and national regulations.
Any failure to correctly install this appliance could cause damage or injuries!
Do not make modifications to parts of the appliance, unless you have contacted the company
and an authorized service contractor.
Only original accessories and spare parts must be used to ensure correct and safe function.
Make sure you respect the cleaning and maintenance procedures on the corresponding
intervals. Failure to do so can cause malfunction to the appliance and possible damages.
The boiler is design to function on the fuels indicated in the corresponding paragraph. Any
other fuel is prohibited. Do not use explosive or flammable substances! Do not store such
substances inside the boiler room.
The working pressure varies according to the model. Make sure you use the appropriate water
pressure. Working in a pressure higher than the one indicated in this manual is
strictly prohibited and dangerous!
1.3. Data label
The data label of the appliance is placed on the boiler’s side cover, on the external part. Make
sure that it is properly placed and readable.
On the label it is indicated the serial number and the manufacturing year of the appliance.
1.4. 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.

TECHNICAL FEATURES AND DIMENSIONS
4
2. TECHNICAL FEATURES AND DIMENSIONS
2.1. Technical features
MULTIPLEX boiler is a steel solid fuel boiler, with cylindrical heat exchanger consisted of fire
tubes.
The boiler body is made of cold rolled steel St 37.2 STAS 500/2-80~S235 JR SR EN 10025/90
according to DIN 17100. The boiler is designed so that all the parts in contact with exhaust
gases are water cooled. The boiler body parts are assembled by welding. Weldings are
performed according to standards 288-1 and 288-3 according to DIN 50120, 50121-50145, SR
EN 1011.1/2001, by means of electric arc welding (MIG-MAG).
DESCIPTION OF COMPONENTS
Steel boiler body with cylindrical heat exchanger
Removable rear smoke box with inspection cleaning door
Upper door for cleaning the heat exchanger
Middle door for ignition and fuel loading, equipped with an inspection flange, which can also
be used for a burner mounting
Lower door for ash removal
Ash box positioned on the lower part of the fire chamber
Combustion fan positioned on the rear of the boiler
Air distributor on the bottom of the grate for even air distribution to all the boiler length
Rockwool body insulation of 50 mm thickness
Electrostatically painted external covers
Control panel for electromechanical operation
Safety heat exchanger (optional)
2.2. Function principle
The function of the MULTIPLEX boiler is
based on natural gas evacuation through
the chimney. The fuel is positioned on the
grate. The combustion takes place in the
fire chamber. During the combustion the
flame comes in contact with the side
walls of the fire chamber, which are
surrounded by water. The fire chamber is
of big volume in order to receive big
dimension logs and to ensure a long
autonomy.
The combustion air is supplied by the fan
and distributed through an air distributor,
positioned below the fuel grate. The
combustion is regulated through the fan,
controlled by the control panel.
Fig 1. Boiler function
The exhaust gases are guided through the heat exchanger to the smoke box, and afterwards
evacuated to the chimney. The smoke box is equipped with an inspection and cleaning door,
which also actions as an explosion relief.
The doors have an insulation cord to ensure air-tight closing. Each door is equipped with a
screwed handle, which must always be well tightened during the combustion. The flange on
the middle door has a rotating clamp, for secondary air adjustment and flame inspection. If
necessary, this flange can be removed, and a burner can be placed in its position.

TECHNICAL FEATURES AND DIMENSIONS
5
2.3. Dimensions
DIMENSIONS
Type
Feeding
door
A
A1
B
H
H1
E
C
T3
T1-
T2
T5
T6
mm
mm
mm
inch
MCL 70
600x360
910
810
860
1600
1720
1240
1280
245
2”
1 ¼”
¾”
MCL 80
600x360
910
810
980
1600
1720
1240
1380
245
2”
1 ¼”
¾”
MCL 90
600x360
910
810
1100
1600
1720
1240
1480
245
2”
1 ¼”
¾”
MCL 100
600x360
910
810
1200
1600
1720
1240
1580
295
2 ½”
1 ¼”
¾”
MCL 120
600x360
910
810
1330
1600
1720
1240
1680
295
2 ½”
1 ½”
¾”
MCL 150
600x360
910
810
1830
1600
1720
1240
2000
295
2 ½”
1 ½”
¾”
MCL 180
600x360
910
810
1830
1600
1720
1240
2300
295
2 ½”
1 ½”
¾”
MCL 200
500x810
1100
1000
1350
2000
2160
1500
1950
345
3”
2”
2x¾”
MCL 250
500x810
1100
1000
1600
2000
2160
1500
2200
345
3”
2”
2x¾”
MCL 300
500x810
1100
1000
1850
2000
2160
1500
2450
395
4”
2”
2x¾”
MCL 350
500x810
1100
1000
1850
2000
2160
1500
2450
395
4”
2”
2x¾”
MCL 400
500x810
1100
1000
2100
2000
2160
1500
2650
395
4”
2”
2x¾”
MCL 450
500x810
1100
1000
2100
2000
2160
1500
2650
395
4”
2”
2x¾”
MCL 500
1230x520
1540
1440
1600
2400
2650
1750
2300
445
4”
2 ½”
2x¾”
MCL 600
1230x520
1540
1440
1800
2400
2650
1750
25700
445
5”
2 ½”
2x¾”
MCL 700
1230x520
1540
1440
2150
2400
2650
1750
2820
495
5”
2 ½”
2x¾”
MCL 800
1230x520
1540
1440
2400
2400
2650
1750
3070
495
6”
3”
2x¾”
MCL 900
1230x520
1640
1540
2600
2870
2650
1750
3350
495
6”
3”
2x¾”
MCL 1000
1230x520
1640
1540
2800
2870
2650
1750
3500
495
6”
3”
2x¾”

TECHNICAL FEATURES AND DIMENSIONS
6
*Nominal output is obtained with good quality wood, with 15% humidity.
TECHNICAL DATA
Boiler
type
Nominal
Output*
Pmax
Fire
chamber
length
Wood
consumption
Max.
wood
length
Fie
chamber
volume
Weight
kcal/h
kW
bar
mm
kg/h
mm
m3
kg
MCL 70
70.000
81
2,5
700
25-28
650
0,300
630
MCL 80
80.000
93
2,5
820
28-32
750
0,325
675
MCL 90
90.000
104
2,5
920
32-36
850
0,342
740
MCL 100
100.000
116
2,5
1080
36-42
950
0,362
800
MCL 120
120.000
139
2,5
1200
43-48
1000
0,400
880
MCL 150
150.000
174
2,5
1450
54-60
1250
0,475
990
MCL 180
170.000
208
2,5
1650
64-70
1450
0,574
1220
MCL 200
200.000
232
3
1000
72-80
900
0,625
1420
MCL 250
250.000
291
3
1100
89-104
1000
0,787
1600
MCL 300
300.000
349
3
1200
107-115
1100
0,937
2130
MCL 350
350.000
406
3
1450
110-130
1350
1,132
2160
MCL 400
400.000
465
3
1700
125-140
1600
1,327
2200
MCL 450
450.000
522
3
1700
130-150
1600
1,530
2650
MCL 500
500.000
581
4
1400
143-165
1300
1,800
3000
MCL 600
600.000
698
4
1600
178-205
1500
2,080
3400
MCL 700
700.000
814
4
1800
215-230
1700
2,350
4000
MCL 800
800.000
928
4
2000
240-275
1900
2,889
4800
MCL 900
1000.000
1.044
4
2200
250-285
2100
3,178
5500
MCL 1000
1000.000
1.116
4
2400
295-345
2300
3,320
5850

TECHNICAL FEATURES AND DIMENSIONS
7
2.4. Fuel
The MULTIPLEX series is designed for use with solid fuel of biogenic or fossil nature. This
means different types of natural wood, solid residues of organic nature coming from trees or
agricultural plants, wood briquettes of various types. Carbon or other similar fossil fuels are
allowed, but only in combination with wood and maximum 20% volume ratio at every load. If
you want to use solely carbon as fuel, please contact the manufacturer.
Good quality wood is oak, ash, beech, maple, olive tree and fruit trees, except cherry. Medium
quality wood is chesnut and birch. Low quality wood is poplar and willow.
Table 1. Calorific power of different types of wood
Every type of wood contains a significant amount of humidity, which highly affects its
combustion behaviour and calorific value. Boiler output, efficiency and autonomy will
significantly diminish as the humidity increases. The nominal data presented in this manual are
calculated for humidity content 15%.
For proper and efficient function and a long lifespan, it is strictly recommended that only dry
wood is used, with a humidity content of 15%. Practically, this means at least one year dry
wood. Maximum humidity content allowed is 25%.
As understood, wood is an extremely heterogenous fuel, due to differnet essences, different
humidity contents, shapes and dimensions. This is why the combustion behaviour higly varies
through time and average data as fuel consumption, autonomy, and output are very difficult to
forecast.
0
10
20
30
40
50
60
2,2
2,8
3,4
3,7
4,0
4,3
4,6
4,8
5,1
Humidity [%]
Lower Calorific Power [kWh/kg]
Calorific power in relation to humidity
Fuel
Calorific power
kWh/kg
kcal/kg
Oak
4,2
3.600
Beech
4,0
3.450
Birch
4,3
3.700
Poplar
4,1
3.500
Pine
4,4
3.800
Spruce, Fir
4,5
3.900
Wood briquettes
4,0 –4,9
3.600 –4.200
Carbon
Anthracite
5,6 –6,5
4.800 –5.600
Coal
4,5 –6,4
3.900 –5.500
Brown carbon
2,7 –4,2
2.300 –3.600
Lignite
1,6 –3,8
1.400 –3.300

TECHNICAL FEATURES AND DIMENSIONS
8
It is prohibited the use of laminated wood, or other chemical treatment.
It is prohibited the use of explosive, inflammable materials, plastic, domestic
residues, etc.
The boiler is provided with a flange for mounting a burner for use with oil or gas as an
alternative fuel. However, this option is an emergency alternative, and it is not recommended
that boiler is on stable function on oil or gas. The efficiency will be very low on such fuels.
If a burner is mounted, remove it before you use solid fuel again.
It is prohibited to manually feed solid fuel in the boiler simultaneously with the
burner function!

BOILER MOUNTING
9
3. BOILER MOUNTING
3.1. Transportation and delivery
The boiler is delivered on wood pallet, well positioned with metal plates. Remove them
carefully by unscrewinf the screws holding them in place.
The loading and unloading of the boiler must be performed with a forklift or a crane. A special
hook is provided on the upper part of the boiler for lifting.
The boiler is very heavy. Do not try to lift by hands or other unsuitable
equipment. Danger of injury! Perform all moves with extreme attention and care.
Remove the boiler packaging with attention. Keep the packaging material away from
chidren since it can be dangerous. After having unpacked everything, make sure that the
appliacne is intact and undamaged. In case of doubt do not use the appliance and inform the
supplier.
The MULTIPLEX boiler is delivered with the following equipment already fitted and mounted:
Boiler steel body
Rockwool insulation mounted on the boiler body and tightened with plastic tapes
Metal covers mounted on the boiler body
Turbinators positioned inside the fire tubes
The following accessories are positioned inside the boiler body. Remove them carefully by
opening the middle door.
Cleaning tools
Fan
Control panel
Safety kit
Drainage valve
In the documentation folder you will find:
Technical manual
Warranty leaflet
Declaration of conformity
3.2. Boiler room
3.2.1. General requirements
The boiler must be installed in a special and separate room. This room must be chosen so that
it offers easy access for fuel transport, air supply and exhaust gas evacuation. The doors of the
boiler room must be metallic, open outwards, and have at least 0,9 m width.
The boiler installation is prohibited in rooms with extensive dust, dangerous
gases, and moist spaces.
For the correct boiler function it is necessary that the boiler room has openings for natural
ventilation and combustion air supply. It is recommended that two different openings are used
for this purpose, positioned on opposite walls and diagonally to ensure good air circulation. The
total surface of the openings must be at least 1/12 of the boiler room surface. Forced
ventilation is prohibited in the boiler room.
The boiler room must be provided with a drainage channel. All safety devices must be
connected to this channel.

BOILER MOUNTING
10
The boiler room must have an appropriate fire extinguishing system, according to the
regulations in force. In case that the building is designed with a fire alarm system, a smoke
detector must be positioned on top of every boiler.
The fuel storage is prohibited in the boiler room. If so, the storage must be separated from the
boiler with a non-flammable wall, and proper distanced from the boiler.
3.2.2. Boiler room dimensions
The boiler must be placed on a horizontal plane, with adequate mechanical resistance to
support the boiler’s weight. The boiler must be positioned in the room in such a way so that it
is easily accessible from all the sides. The following dimensions are recommended (see Fig 2):
Distance from the front wall (N):
For boilers up to 100 kW –minimum 1,5 m
For boilers bigger than 100 kW –minimum 2 m
Distance from the rear wall (L):
Appropriate distance for maintenance access. Minimum 0,6 m.
Distance from side walls (M):
For boiler up to 300 KW –minimum 0,6 m
For boilers bigger than 300 kW –minimum 1 m
Boiler room height (H):
For boilers up to 70 kW –minimum 2 m
For boilers 70 to 230 kW –minimum 2,4 m
For boiler 230 to 400 kW –minimum 3 m
For boiler bigger than 400 kW –minimum 3,5 m
Distance between two boilers (P) must be at least 1m.
Fig 2. Boiler room dimensions

BOILER MOUNTING
11
3.3. Mounting instructions
3.3.1. Fan
The fan is positioned at the back side of
the boiler, at the flange provided.
Screw the fan in position with the
provided screws and mount with the
washers and nuts, as shown in the Fig 3
Fig 3. Mounting the fan
3.3.2. Control panel
The control is mounted at the side cover
of the boiler, as seen on Fig 4Error!
Reference source not found.. Inside
the package of the panel you will find two
plastic screws for mounting.
Remove the top cover of the boiler, insert
the screws from the inner side of the side
cover and fix the panel. Tighten the
screws.
Fig 4. Mounting the control panel

BOILER MOUNTING
12
All the instruments have capillary bulbs,
which must be inserted in the provided
boiler case. There are four bulbs that must
be inserted: thermometer, fan thermostat,
pump thermostat, safety thermostat. Pass
the cables through the oval hole on the
cover and guide them to the bulb case, as
shown on Fig 5. Do not bend or fold the
capillary tubes of the bulbs. Do not add
any substances like oil or Vaseline for
thermal conductivity, they can destroy the
bulbs! Secure the excess length on top of
the insulation, and pay attention not to
touch on hot metal surfaces. After
inserting them, secure them with the
metallic safety strip provided.
Fig 5. Inserting the bulbs
If the bulbs are not well inserted and secured in the case, there is danger that
the controls will not function and the boiler will overheat!
The control panel is equipped with fast
plugs for the devices (pump and fan).
Within the control panel you will find the
plugs for the devices. Connect as shown in
the Fig 6.
Connection cables must be of section 1,5
mm2.
Fig 6. Control panel connection plugs

BOILER MOUNTING
13
3.4. Chimney
The chimney installation must supply sufficient draught, air tightness and protection against
condensation.
The appropriate chimney installation is very important for the boiler’s efficient
and safe function!
The chimney must be positioned if possible in the interior of the building. It must be vertical,
with no changes in the direction. The cross-section of the chimney can be round or
rectangular. If the chimney is installed in the exterior, it must be insulated.
The horizontal part connecting the boiler’s chimney pipe with the vertical chimney must have
maximum length 2 m. If this distance is bigger, it is recommended to have a 15-30oinclination
upwards. The connection with the boiler’s chimney pipe must be air-tight.
The chimney must be equipped with a cleaning door at its base. Also cleaning doors are
recommended where there are changes in direction and ash can be accumulated. Tactical
cleaning is recommended (every 3 months) for efficient boiler function.
A chimney terminal must be installed at the end of the chimney for protection against weather
effects and foreign objects entrance. In areas with strong winds a special anti-downdraught
terminal is recommended.
The chimney height must exceed the roofline by at least 1 m. If there are other obstacles
positioned on the roof, the chimney height must exceed them by at least 1 m. If there are
multiple chimneys, minimum distance between them is 0,3m.
Each boiler should be connected to an independent chimney. Connection of multiple boilers to
the same chimney is not recommended.
Fig 7. Chimney distances
Fig 8. Chimney connection

INSTALLATION
14
4. INSTALLATION
4.1. Hydraulic connections
The boiler is intended for connection with an open expansion vessel network. The boiler can be
connected also with closed expansion vessel, if it is equipped with an overheating serpentine
(optional).
The boiler is intended for maximum working temperature 90oC and maximum pressure 3 bar
for boilers up to 500 kW, and 4 bar for bigger boilers.
When connected with a closed expansion vessel, its volume must be chosen double to a similar
installation on liquid or gas fuel.
If a connection pipe is not used, it must be sealed before water fill!
Legend
T1
Outlet
T2
Return
T3
Chimney pipe
T4
Discharge valve connection
T5
Safety kit connection
T6
Additional safety connection
4.2. Safety features
The boiler equipment includes a safety kit, which shall be connected to the corresponding
connection pipe T5. The kit consists of a safety valve, an air relief valve and a
thermomanometer. Bigger boilers are equipped with two or more safety valves.
Fig 9. Boiler safety kit

INSTALLATION
15
Additional safety equipment can be mounted at the connection pipe T6. This can be a dual
safety valve (pressure and temperature) or a cooling valve. Alternatively this pipe can be used
for connection with the expansion vessel.
4.3. Overheating serpentine
As an optional, the boiler can be equipped with an overheating protection serpentine. This is
incorporated in the boiler body, surrounding the fire chamber.
For the function of the safety serpentine, a discharge valve must be installed. The
bulb of the valve must be mounted on the boiler’s hot water delivery, at maximum distance
1m from the boiler.
Fig 10. Overheating serpentine connection
The valve can be connected on either side of the serpentine. Attention should be given to the
flow direction of the valve. The valve can be fitted on the cold water inlet or hot water outlet.
However, we recommend that the valve is fitted on the cold water inlet.
For the protection of the valve, a filter is recommended to be installed on the water line before
the valve.
On the opposite side of the serpentine, drainage must be connected.
The correct function of the discharge valve is crucial for the boiler’s safety.
Verify its function often and replace if defect.
4.4. Return temperature protection
For the correct function of the boiler and for protection against corrosion it is very important to
ensure steady temperature at the return of the boiler of at least 55oC.
This can be ensured by installing a recirculation pump between the boiler outlet and return
(see connection diagrams).
An alternative variation is by installing at the return of the boiler a three-way thermostatic
valve.

INSTALLATION
16
4.5. Filling the system
After completing all the hydraulic connections, the circuit may be filled with water. After filling
the system, open the radiators air valves to get rid of the air in the installation.
Verify that the installation pressure is according to the technical feature of the boiler. The
pressure must be verified through the boiler’s manometer. An additional manometer should be
installed on the cold water inlet to verify the cold pressure, at the lowest point of the
installation, at a point close to the boiler.
The whole installation must remain under nominal pressure for at least 10 minutes. During this
period, check that all the connections are tight and there are no water leakages. Make sure
that during this period no pressure drop appears.
After firing the boiler, make sure the network functions properly at working temperature and
pressure.
The hardness of the mains water supply affects the boiler’s life span. It is
recommended to use a water softener if water hardness exceeds 15of.
Do not fill the system at the working pressure! When the boiler will be heated,
the water pressure will raise. Filling pressure must be at least 1 bar lower than
working pressure!

INSTALLATION
17
4.6. Connection diagrams
4.6.1. Open expansion vessel connection
Legend
1-9.
Separation valves
10,11.
Radiator valves
12.
Radiators
13-15.
Safety valves
16.
Filling valve
17.
Drainage valve
18.
Cold water valve
19-24.
One-way valves
B
Hot water boiler
VED
Open expansion vessel
PCI
Central heating pump
PRC
Recirculation pump
RP
Pressure reducer
F
Filter
A
Air relief valve
FD
Water softener

INSTALLATION
18
4.6.2. Closed expansion vessel connection
Legenda
1-9.
Separation valves
10,11.
Radiator valves
12.
Radiators
13-15.
Safety valves
16.
Filling valve
17.
Drainage valve
18.
Cold water valve
19-24.
One-way valves
B
Hot water boiler
VE
Closed expansion vessel
PCI
Central heating pump
PRC
Recirculation pump
RP
Pressure reducer
F
Filter
A
Air relief valve
FD
Water softener

ELECTRICAL CONNECTIONS
19
5. ELECTRICAL CONNECTIONS
5.1. General instructions
All electrical connection must be performed by an authorized professional, in conformity with
the local regulations and the indications of this manual. Connections must be done according
to norms EN 60529 and EN 60335-1, and protection norms IP 40 and IP 44.
All wiring must be waterproof insulated. Exposed cables should be protected within plastic
channel. The main electrical supply of the boiler must be connected to an independent safety
of max 16A. The boiler room lighting must be on a separate circuit.
THERMOSTAHL is not responsible for accidents or malfunctions caused by
wrong or bad electrical connections.
5.2. Control panel functions
Fig 11. Control panel
The general switch ON/OFF interrupts the electrical supply to all the devices.
The fan thermostat interrupts the fan function when the preset boiler temperature has been
reached. It is recommended that this temperature is set between 70-90oC. This temperature
should never be set below 55oC.
The fan speed regulator regulates the fan rotating speed by means of a dimmer rheostat.
The pump thermostat starts the circulation pump function at the preset temperature. It is
recommended that this temperature is set around 45-55oC.
The safety thermostat will interrupt the fan function if the boiler temperature reaches above
95oC. If so, it needs to be reset manually by unscrewing the plastic cover.
The fan and pump indication lamps follow the function of the corresponding devices.
If a burner is connected to the control panel, it can be connected in the place of the fan and
regulated by the fan thermostat.
The control panel offers the possibility to connect with a room thermostat. When the room
thermostat contact opens, the fan function stops.
Legend:
1.
Thermometer
2.
Fan thermostat
3.
Safety thermostat
4.
Pump thermostat
5.
Fan speed regulator
6.
General ON/OFF switch
7.
Fan indication lamp
8.
Pump indication lamp

ELECTRICAL CONNECTIONS
20
5.3. Wiring diagram
Fig 12. Control panel wiring diagram
Legend:
M
General ON/OFF switch
TS
Safety thermostat
TB
Fan/Burner thermostat
TP
Pump thermostat
L
General function lamp
LB
Fan indication lamp
LP
Pump indication lamp
TR
Room thermostat
F1
Fuse safety
VT
Fan speed regulator
PE
Grounding
Unscrew the control panel back plate to have access to the connection terminals in the interior.
Connect the main electrical supply to the terminals 1,2,3 as indicated. The fan is connected to
the terminals 9,10,11 and the pump to the terminals 4,5,6.
Between the terminals 7,8 there is a jumper. If you want to connect a room thermostat,
remove the jumper and connect it to these two terminals.
Attention: The room thermostat must be a simple contact interruptor. It is not
allowed to connect a digital thermostat with an electrical signal output!