Metal-Fach Slim Pellet Series Installation guide

SLIM PELLET MINI/SLIM PELLET
OPERATION AND MAINTENANCE DOCUMENTATION
ENGLISH
TRANSLATION OF
THE ORIGINAL MANUAL
ISSUE I 2018/11/09

1
Technical documentation of boilers:
Boiler name
Palnik
SLIM PELLET;
SLIM PELLET MINI;
DW-X
DW-X

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INTRODUCTION
Dear User, Thank you for choosing the heating boiler from Metal-Fach. We hope that the device will meet your requirements and bring much satisfaction. The heating boiler was designed and
manufactured according to the most important, current norms and standards, guaranteeing safety and dependable use. Using the device in accordance with the provided manual ensures effective and
dependable operation.
The boiler is not meant to be operated by persons of lowered mental or physical independence or by persons with no experience or limited knowledge about the product if they are not supervised or
instructed by the person responsible for their safety. Operation by children is prohibited.

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Table of Contents
1. Initial activities .............................................................................................................................4
2. Applied symbols ..........................................................................................................................4
3. General information ...................................................................................................................4
4. Use 4
5. Basic elements of the boilers SLIM PELLET and SLIM PELLET MINI .......................................5
6. Boiler equipment ........................................................................................................................7
7. Basic dimentions of the boilers SLIM PELLET and SLIM PELLET MINI....................................8
8. Technical specifications SLIM PELLET and SLIM PELLET MINI ..............................................10
9. Control and safety.....................................................................................................................12
10. Fuel 12
11. Requirements for the boiler room and boiler installation....................................................12
12. Boiler installation ......................................................................................................................13
13. Connecting the boiler to the heating system .........................................................................14
14. Connection of boiler to heating installation in closed-loop system.....................................18
15. Requirements for the expansion vessel .................................................................................21
16. Connecting the boiler to the power supply............................................................................21
17. Connecting the boiler to the chimney.....................................................................................24
18. Boiler start-up............................................................................................................................24
19. Tips when using the boiler .......................................................................................................25
20. Boiler maintenece and cleaning ..............................................................................................25
21. Instruction for utilising the boiler............................................................................................25
22. Spare parts list...........................................................................................................................26
23. Possible faults and malfunctions.............................................................................................26
24. Potential problems with PELLAS-series pellet burner...........................................................30
Warranty conditions .................................................................................................................32
Confirmation of performance of inspection, guarantee repair, maintenance service: .....34
Conformity declaration WE/UE ................................................................................................37
Warranty Card for the steel boilers, central heating water boilers......................................39
Warranty claim ..........................................................................................................................41
Start-up report...........................................................................................................................43
Start-up report...........................................................................................................................45
List of tables
Tab. 6.1 Boiler equipment ................................................................................................................... 7
Tab. 7.1 Boiler dimentions (mm) SLIM PELLET .................................................................................. 8
Tab. 8.1 Technical specifications SLIM PELLET ................................................................................ 10
Tab. 8.2 Technical specifications SLIM PELLET MINI ....................................................................... 11
Tab. 12.1 Flammability of construction products............................................................................ 14
Tab. 13.1 Symbols applied in the schematics.................................................................................. 15
Tab. 13.2 Symbols applied in the schematics.................................................................................. 15
Tab. 14.1 Examples of devices enabling heating systems protection........................................... 18
Tab. 22.1 Spare parts ......................................................................................................................... 26
Description of schematics
Schematic 1.1 Serial plate.................................................................................................................... 4
Schematic 5.1 Basic elements of the boiler SLIM PELLET................................................................. 5
Schematic 5.2 Basic elements of the boiler SLIM PELLET MINI........................................................ 6
Schematic 7.1 Boiler dimentions SLIM PELLET .................................................................................. 8
Schematic 7.2 Boiler dimentions SLIM PELLET MINI......................................................................... 9
Schematic 11.1 Minimal requirements for the boiler room........................................................... 13
Schematic 12.1 Method of installing boiler leveling feet................................................................ 13
Schematic 13.1 Connecting the boiler to the heating system diagram ........................................ 15
Schematic 13.2 Connecting boilers to the heating system diagram ............................................. 15
Schematic 13.3 Connecting the boiler to the heating system........................................................ 16
Schematic 13.4 Connecting the boiler to the heating system with Laddomat and buffer.......... 16
Schematic 13.5 Diagram with four-way valve controlling central heating circulations............... 17
Schematic 13.6 Diagram with two regulated heating circulations and with dispenser............... 17
Schematic 13.7 Diagram C with thermal buffer .............................................................................. 18
Schematic 14.1 Safety schematics of the boiler with the cooling coil and thermal protection .. 19
Schematic 14. 2 Diagram of boiler protection by means of cooling valve DBV-2. ....................... 19
Schematic 14. 3 Example of DBV2 valve connection to the boiler's supply.................................. 20
Schematic 16.1 Electrical schematics for connecting the boiler–controller PLATINUM. ............ 22
Schematic 16.2 Electrical schematics for connecting the boiler .................................................... 23

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1. Initial activities
(USER)
Procedure to follow on delivery of the METAL-FACH boiler
check if the boiler is complete (tab 5.1) and if it has not been damaged during delivery
confront your order with the data plate, that is placed on the left or right on the boiler body
read the user's manual carefully as it contains all the information required for safe operation
of the boiler
If you happen to encounter any problems, please contact our service department or dedicated
METAL- FACH service centre. The staff are trained and certified and have access to the original parts
which ensure proper servicing and boiler installation.
Schematic 1.1 Serial plate
2. Applied symbols
(USER/INSTALLER)
ATTENTION!
Very important piece of information that needs to be read
TIP!
Information that should be read to make operation easier.
3. General information
(USER)
The maintenance and operation documentation is a part of the product that comes with the
delivered boiler. The Operation and Maintenance Documentation contains data concerning the
design, installation and method of using SLIM PELLET series boilers with a self-cleaning pellet
burner. A thorough study of the manual enables a proper and safe operation of the boiler.
ATTENTION!
The user is advised to follow all guidelines concerning the appliance given in this
Operation and Maintenance Documentation, Guarantee Terms as well as in
generally applicable law.
Our boilers are shipped assembled. They are tightly attached to a pallet. Some other forms of
securing the boiler are used e.g. foil wrapping.
During the shipping, the boiler should be tightly secured (e.g.with transport belts) so that it does
not turn or move. The delivery should meet the requirements set in the general rules for
transporting materials. The loading and unloading of the boilers should be carried out using lifting
devices (fork lift truck) of lifting capacity over 1000kg.
4. Use
(USER/INSTALLER)
Boilers intended for heating of residential buildings like: single-family and multi-family homes,
utility buildings, public buildings, and for heating of domestic hot water are equipped with an
automatic fuel feeding system. Thanks to the newest construction solutions, the SLIM boilers can
reach the capacity of 90%. The proper operation and highest performance of the boiler depends on
the quality of installation, right flue and appropriate service and maintenance.
ATTENTION!
Boilers are intended for work in open- and closed-loop water systems with gravity or
forced circulation, with safeguards compliant with the requirements of the
applicable standard PN-B-02413 Heating and Heat Engineering, as well as with a
closed-loop system compliant with standard PN-EN 12828 Heating installations in
buildings. Designing.

5
5. Basic elements of the boilers SLIM PELLET
and SLIM PELLET MINI
(USER/INSTALLER)
SLIM PELLET and SLIM PELLET MINI are boilers with an automatic burner for biomass in the form
of wood pellets. The boiler is made of attested P265GH steel sheets (furnace parts), S235JR steel
sheets (parts of the water jacket) and heat-resistant steel (burner parts directly exposed to flame).
The boiler's exchanger is a flue-combustion tube design with two horizontal flues. A flue tube found
in the lower part of the body serves as the furnace chamber, in which a self-cleaning pellet burner
is installed. An automatic feeder supplies fuel from the dispenser found above the exchanger (in the
SLIM PELLET version) or standing independently to the side of the exchanger (SLIM PELLET MINI
version). An electronic regulator fluidly controls the work of the burner and pumps in the heating
installation.
Schematics description
1. Exchanger
2. Self-cleaning pellet burner
3. Fuel bin
4. Ash pan and furnace door
5. Flue cleaning hatch
6. Flue
7. Infeed stub
8. Return stub
9. Discharge stub
10. Boiler temperature capillaries and STB
11. Capillary for fumes sensor
12. Ash drawer
13. Flexible fuel supply hose
14. Feeder
15. Controller display
16. Master switch
17. Fuse
18. STB
19. Bin cover
20. Cable exit
21. Cleaning hatch
Schematic 5.1 Basic elements of the boiler SLIM PELLET

6
Schematic 5.2 Basic elements of the boiler SLIM PELLET MINI
Schematics description
1. Exchanger
2. Self-cleaning pellet burner
3. Fuel bin
4. Ash pan and furnace door
5. Flue cleaning hatch
6. Flue
7. Infeed stub
8. Return stub
9. Discharge stub
10. Boiler temperature capillaries and STB
11. Capillary for fumes sensor
12. Ash drawer
13. Flexible fuel supply hose
14. Feeder
15. Controller display
16. Master switch
17. Fuse
18. STB
19. Bin cover
20. Cable exit
21. Cleaning hatch

7
6. Boiler equipment
(USER)
The delivery includes basic as well as additional elements depending on the type of order. On
receiving the boiler you should carefully inspect the boiler to ensure that it has been delivered
undamaged and complete. The additional and basic elements are listed below (Tab. 6.1).
Tab. 6.1 Boiler equipment
Basic equipment
Unit
Number
of items
Central heating boiler
pcs.
1
Microprocessor regulator
pcs.
1
Fuel feeding system with self-cleaning pellet burner
kpl.
1
Fuel bin
pcs.
1
Boiler cleaning equipment
Brush
Scraper
pcs.
1
Adjustable screws
pcs.
4
Additional equipment
Unit
Number
of items
LAMBDA SENSOR module *
pcs.
1
Documentation
Unit
Number
of items
Boiler maintenance and operation documentation
pcs.
1
Controller user's manual and warranty card
pcs.
1
Blower fan user's manual and warranty card
pcs.
1
ATTENTION!
The user should thoroughly read the instruction manual of the regulator, fan and
feeder along as well as the self-cleaning pellet burner.
ATTENTION!
METAL-FACH reserves the right to implement changes to the parametres, equipment
and specification of the offered products without prior notice.

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7. Basic dimentions of the boilers SLIM
PELLET and SLIM PELLET MINI
(USER/INSTALLER)
Schematic 7.1 Boiler dimentions SLIM PELLET
Tab. 7.1 Boiler dimentions (mm) SLIM PELLET
TYPE
SLIM PELLET 10
SLIM PELLET 15
SLIM PELLET 20
A
-
-
-
B
590
590
690
C
1550
1550
1550
C1
-
-
-
D
705
920
920
E
1510
1510
1510
E1
865
865
865
F
656
656
656
G
G3/4''
G3/4''
G3/4''
H
G1 1/4''
G1 1/4''
G1 1/4''
I
160
160
160
J
G1 1/4''
G1 1/4''
G1 1/4''
K
200
200
200
L
130
130
130
M
-
-
-
N
-
-
-
O
880
1100
1100
P
1260
1470
1470
*This dimension does not account for the height of feet for leveling of the boiler.

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Schematic 7.2 Boiler dimentions SLIM PELLET MINI
Tab. 7.2 Boiler dimentions (mm) SLIM PELLET MINI
TYPE
SLIM PELLET MINI 10
SLIM PELLET MINI 15
SLIM PELLET MINI 20
A
1220
1220
1320
B
590
590
690
C
1020
1020
1020
C1
1370
1370
1370
D
705
920
920
E
905
905
905
E1
865
865
865
F
656
656
656
G
G3/4''
G3/4''
G3/4''
H
G1 1/4''
G1 1/4''
G1 1/4''
I
160
160
160
J
G1 1/4''
G1 1/4''
G1 1/4''
K
200
200
200
L
130
130
130
M
600
600
600
N
600
600
600
O
880
1100
1100
P
1260
1470
1470
*This dimension does not account for the height of feet for leveling of the boiler.

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8. Technical specifications SLIM PELLET and SLIM PELLET MINI
(USER/INSTALLER)
Tab. 8.1 Technical specifications SLIM PELLET
PARAMETERS
UNIT
TYPE OF BOILERS
SLIM PELLET 10
SLIM PELLET 15
SLIM PELLET 20
Nominal thermal output
[kW]
10
15
20
Boiler power range
[kW]
3-10
4,5-15
6-20
Heating surface
[m2]
1,5
2,1
2,5
Boiler water capacity
[L]
45
65
75
Maximum working pressure
[bar]
3
3
3
Maximum working temperature
[°C]
85
85
85
Test pressure
[bar]
4,5
4,5
4,5
Boiler class
-
5
5
5
Boiler efficiency
[%]
≥89
≥89
≥89
Single fuel load
[L]
130
170
210
Fuel
[-]
pellet φ6-8
Power supply
-
~230V; 50Hz
Power consumption at boiler nominal power
[W]
115
115
115
Electric- power consumption (temporarily
maximum)
[W]
415
415
415
Temperature controller setting range
[°C]
60-85 (1 at a time)
Required chimney flue
[Pa]
20
23
26
Flue gas mass flow
[g/s]
-
-
-
Flow resistance δT [10k]
[mbar]
0,29
0,65
1,16
Flow resistance δT[20k]
[mbar]
0,07
0,16
0,29
Boiler weight
[kg]
240
290
340

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Tab. 8.2 Technical specifications SLIM PELLET MINI
PARAMETERS
UNIT
TYPE OF BOILERS
SLIM PELLET MINI 10
SLIM PELLET MINI 15
SLIM PELLET MINI 20
Nominal thermal output
[kW]
10
15
20
Boiler power range
[kW]
3-10
4,5-15
6-20
Heating surface
[m2]
1,5
2,1
2,5
Boiler water capacity
[L]
45
65
75
Maximum working pressure
[bar]
3
3
3
Maximum working temperature
[°C]
95
95
95
Test pressure
[bar]
4,5
4,5
4,5
Boiler class
-
5
5
5
Boiler efficiency
[%]
≥89
≥89
≥89
Single fuel load
[L]
230
230
230
Fuel
[-]
pellet φ6-8
Power supply
-
~230V; 50Hz
Power consumption at boiler nominal power
[W]
115
115
115
Electric- power consumption (temporarily
maximum)
[W]
415
415
415
Temperature controller setting range
[°C]
60-85 (1 at a time)
Required chimney flue
[Pa]
20
23
26
Flue gas mass flow
[g/s]
-
-
-
Flow resistance δT [10k]
[mbar]
0,29
0,65
1,16
Flow resistance δT[20k]
[mbar]
0,07
0,16
0,29
Boiler weight
[kg]
240
290
340

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9. Control and safety
(USER/INSTALLER)
1) Automatic control of the boiler can adjust:
boiler temperature
central heating circulation temperature
fuel feeder operation time
feeder and vent manual control time
2) Temperature sensor
The STB mechanical protection is situated inside the boiler and prevent the heating system from
overheating. It is set by default at 95oC. If temperature exceeds 95, the vent is turned off. At the
same time central heating hot water pumps come on and the mixer valve opens.
10. Fuel
(USER)
The fuel for firing boilers equipped with a pellet burner is:
1) Class C wood pellet compliant with section 5.3 (Table 7) of standard PN EN 303-5:2012:
diameter: 6 ± 1 mm; 8 ± 1mm;
length: 3,15 ≤ L ≤ 40;
humidity ≤ 12%;
ash content ≤ 0,5%;
calorific value >17 MJ / kg;
The fuel should be clean and not contain rocks, pieces of wood etc.
11. Requirements for the boiler room and
boiler installation
(USER/INSTALLER)
In Poland, all the soild fuels boilers should be made in accordance with PN- 87/B-02411 Norm
„Soild fuels boilers”. The have been divided into two categories.
1) For small boilers under 25 kW, the following requirements should be met:
the boiler should be placed in the central position to the heated rooms and in a seperate
room.
the floor surface should be inflammable. If the floor is flammable, it should be covered with
steel metal sheet of 0,7 mm thickness and exceed the boiler contour by at least 50 cm. the
boiler should be placed on inflammable base of 0,05 m above the floor and secured by steel
angles.
the boiler room can be lit naturally as well as artificially.
the location of the boiler in the room should enable free access to the boiler during cleaning
and maintenance works. The distance between the back of the boiler and a wall should be
at least 70 cm, the side of the boiler and a wall should be at least 100 cm and the front of
the boiler and a wall opposite should be at least 200 cm;
the height in a new building should be at least 220 cm. in old buildings the the boiler room
should be at least 190 cm high as long as the ventilation inside is sufficient (supply- exhaust
ventilation)
supply ventilation should be provided by an open slot of 200 cm2 in diameter and placed up
to 100 cm over the floor surface.
the exhaust ventilation should be provided by an exhaust duct of 14 x 14 diameter and
made from noncombustible material. Its outlet should be installed under the ceiling of the
boiler room. The exhaust duct should lead out over the roof and placed in the close vicinity
of the chimney. No shut down equipment can be installed on the duct.
2) Boiler rooms of heating power greater than 25kW should meet extra requirements, such
as:
the distance to the far-most chimney, at gravitional draught, cannot exceed 50 cm of the
chimney height.
the fuel and slag store should be located by the boiler room. The storing height up to 220
cm with a 50 cm free space above it.
the equipment for vertical and horizontal delivery of the fuel and slag should be considered.
the fuel store should be equipped with natural ventilation that allows for full airing once an
hour in the fuel store and three airing circles an hour in the slag store.
the entrance door to the boiler room should be fire- resistant (0,5 class of fire resistance),
the minimum width 80cm and should open outside. the door should have a handle- free
system when opened from the inside and have a door handle when coming inside
the requirements for the ventilation are the same as those for the boiler rooms of lower
power; additionaly, in the boiler rooms of power greater than 400 kW, the supply exhaust
ventilation should be accompanied by mechanical ventilation that can be periodically
activated when feeding the fuel and removing slag. it must also be able to provide 10 airing
circles an hour
natural lightning which can light the front of the boiler should be considered in the room.
the total surface of the windows should equal at least 1/15 of the floor surface; half of the
windows in the room should open; the electrical lightining and electrical socket of max. 24 V
should also be located in the room
inspection chamber that will allow cooling water should be located in the floor; its capacity
should equal the water capacity of the biggest boiler but not exceed 2m3
in the boiler room all the heating pipes should be insulated
The placing of the boiler together with the minimum distance requirements is presented in
the boiler room (Schematic 11.1)

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Schematic 11.1 Minimal requirements for the boiler room
ATTENTION!
The mechanical exhaust ventilation should not be used in the boiler room
ATTENTION!
Correct fresh air infeed to the boiler room will ensure efficient fuel burn.
ATTENTION!
Ensure that the carbon dioxide level in the room is not too high.
ATTENTION!
For more information on boiler room construction, refer to the 12.03.2009 Minister
of Infrastructure Law.
TIP!
The rules included in the law serve only as guidelines which must be verified as the
law is amended.
12. Boiler installation
(USER/INSTALLER)
The important element of installation is correct setting and levelling of the SLIM PELLET and
SLIM PELLET MINI boilers. The boilers do not require special base and need to be leveled with
adjustable feet. The boiler must be set in the vertical position.
1. Check that four adjustable feet have been provided
2. Level the boiler in relation to the floor (if the position of the boiler is level, there is no need for
the feet)
3. Place the feet into the dedicated slots.
4. Level the position of the boiler.
Schematic 12.1 Method of installing boiler leveling feet
1- Adjustable screw, pcs. 4
2- Nut M10, pcs. 8
3- Washer Ø10, pcs. 8

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ATTENTION!
If the boiler is not levelled properly it can be damaged.
ATTENTION!
The boiler must not be placed in a damp and wet room as the enhanced corrosion
process will shortly damage the boiler.
The boiler must be placed on a flameproof pad that exceeds the boiler outline by 2 cm. if the
boiler is located in the basement, it is recommended that it is placed on a base of at least 5 cm thick.
The bearing of the floor and the fire hazard conditions are the key elements of choosing the right
location for the boiler i.e:
•20 cm - from any flammable materials
•40 cm - from any flammable materials of C3 flammability
•40 cm - from any flammable materials of unknown flammability
Tab. 12.1 Flammability of construction products
Flammability of
construction products:
Construction products
A - noncombustible
Sandstone, concrete, bricks, fire-resistant plaster, (concrete/
cement) mortar, tiles, granite
B - difficult to ignite
Wood- cement boards/beams, fibreglass, mineral insulation
C1 - difficult to ignite
Beech wood, oak wood, plywood
C2 - normal combustibility
Pine, larch and spruce wood, corck, plank boards, rubber
floorings
C3 - Easily ignited
Asphalt plywood, celluloid compound, polyurethane, polystyrene,
polyethylene, plastics, PVC
13. Connecting the boiler to the heating
system
(INSTALLER)
The connecting of the boiler to the central heating system should be contracted to a producer-
certified company. This procedure should be confirmed in the warranty card which is attached to
this manual. The boiler must be connected according to the manufacturer’s guidelines and this
manual.
ATTENTION!
It is recommended for first start-up of the boiler to be performed according to
the guidelines given in the Operation and Maintenance Documentation, by a person
holding a valid license - (Information concerning persons licensed to start up the
boiler is available from the Manufacturer - tel. [phone]).
ATTENTION!
The temperature of the return water from the central heating boiler should not be
lower than 45C.
ATTENTION!
It is required that the boiler is connected to the heating installation by a four- way
valve.
The schematics of the connecting the boiler to the heating installation meet the PN- 91/B-02420
requirements.

15
Schematic 13.1 Connecting the boiler to the heating system diagram
Tab. 13.1 Symbols applied in the schematics
Designation
Key
RO
Deaeration pipe
RW
Expansion pipe
RS
Signal pipe
RP
Spill pipe
RB
Safety pipe
T1
Temperature
P1
Pressure
Schematic 13.2 Connecting boilers to the heating system diagram
Tab. 13.2 Symbols applied in the schematics
Designation
Key
T
Temperature sensor
Tk
Boiler temperature sensor
Tz
Outside temperature sensor
Tcw
Hot tap water temperature sensor
Tco
Central heating temperature sensor
Tpw
Return water temperature
Tpod
Feeder temperature sensor

16
Schematic 13.3 Connecting the boiler to the heating system
Figure description:
Opis rysunku:
1. Outside the building
2. Expansion vessel
3. Room regulator
4. Mixer
5. Heater
6. Heating circle
7. Floor heating
8. Na zewnątrz budynku
9. Naczynie wzbiorcze
10. Regulator pokojowy
11. Mieszacz
12. Podgrzewacz
13. Obwód grzewczy
14. Ogrzewanie podłogowe
Schematic 13.4 Connecting the boiler to the heating system with Laddomat and buffer
15. Central heating pump (CO)
16. Hot tap water pump (CWU)
17. Circulation pump
18. Additional pump P3
19. Block
20. Laddomat
21. 1,2,3,4 heating circle pumps
22. Thermostat mixing valve

17
Schematic 13.5 Diagram with four-way valve controlling central heating circulations
Descriptions
1. Boiler
2. Regulator
3. Temperature sensor of water returning to
boiler ct4,
4. Boiler temperature sensor ct4 type,
5. Fumes temperature sensor ct2s type
6. Four-way valve actuator,
7. Mixer circulating pump,
8. Temperature sensor of mixer circulation,
9. Hot domestic water tank,
10. Hot tap water pump
11. Hot domestic water sensor,
12. Weather temperature sensor ct6-p,
13. Ecoster touch room panel with room
thermostat function or standard room
thermostat,
14. Thermal insulation
Schematic 13.6 Diagram with two regulated heating circulations and with dispenser
Descriptions
1. Boiler
2. Heat exchanger
3. Regulator module,
4. Boiler temperature sensor ct4 type,
5. Fumes temperature sensor ct2s type
6. Boiler’s pump
7. Thermostatic mixing valve for
increasing return temperature,
8. Hot tap water pump
9. Mixing valve acutator
10. Temperature sensor of mixer circulation ct4,
11. Mixer’s pump
12. Ecoster touch room panel with room
thermostat function or standard room
thermostat,
13. Temperature sensor of domestic hot water tank
ct4,
14. Weather temperature sensor ct6-p,
15. Independent safety thermostat shutting down
the floor heating pump,
16. Equalizing tank,
17. Regulator panel.

18
Schematic 13.7 Diagram C with thermal buffer
Descriptions
1. Boiler
2. Burner
3. Regulator,
4. Boiler temperature sensor ct4 type,
5. Fumes temperature sensor ct2s
type
6. Boiler’s pump
7. Thermal buffer,
8. Hot tap water pump
9. Mixing valve acutator
10. Temperature sensor of mixer
circulation
11. Mixer’s pump
12. Upper buffer temperature sensor,
13. Lower buffer temperature sensor,
14. Ecoster touch room panel with room
thermostat function or standard room
thermostat,
15. Thermostatic three-way valve for return
protection,
16. Weather temperature sensor ct6-p,
17. Additional protection automation
component: thermostat shutting down the
pump in the event of excessive temperature
of water supplying floor heating,
18. Regulator panel.
14. Connection of boiler to heating
installation in closed-loop system
(INSTALLER)
When installing the boiler in the closed system, it is important to use elements that prevent
overheating, excessive increase of pressure and use the controller of temperature during burning
process.
ATTENTION!
The central heating system in the open system must meet the requirements set in
the PN-EN 12828:2006 norm- Heating systems in buildings and the PN-EN 303-
5:2012 Solid fuel boilers with manual and automatic feeding.
Tab. 14.1 Examples of devices enabling heating systems protection
Part
Description
STB
Safety temperature stop with manual return to start position
External cooling coil with VST
112 valve, or DBV-2 valve
Device for drawing off excess thermal power of the boiler
Pressure expansion tank
Preventing heightened pressure
Safetly fixtures
It includes safety valve, manometer and deaerator
ATTENTION
The boiler installed in the closed system must be equipped with all the safety
devices listed in (Tab. 14.1).
ATTENTION!
The cooling coil should be connected to the water system. The power supply cannot
be the pressure tank unit because it needs power supply for its operation.
Protection of the installation by means of external cooling coil.
The coil pipe installed on the supply of the installation is connected to the pipe with cold water,
which flows through it only when the thermal valve, with sensor immersed in th the boiler’s supply,
opens after the set temperature is exceeded. The water goes through the exchanger and receives
the heat from boiler water coat and then is led to the sewage system as hot water might damage it.
The exchanger is able to lower the temperature in the water coat by few degrees within several
seconds. If the temperature in the boiler coat drops below the set temperature then the valve cuts
off the water to the exchanger. In this solution, the high quality of the exchanger and valve allows
several consecutive switch off and on of the protection.

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Schematic 14.1 Safety schematics of the boiler with the cooling coil and thermal protection
Descriptions
1. Boiler
2. Valve. Vst 11);
3. Temperature sensor with capillary;
4. Return valve;
5. Domestic water filter;
6. Safetly fixtures
7. Diaphragm vessel;
8. Cap valve;
9. Pressure gauge;
10. External cooling coil.
Protection of the installation by means of dual-function cooling valve.
Thermal protection by means of cooling valve (e.g. DBV-2) serves to reduce water temperature
in the heating installation when its temperature is exceeded.
After safe temperature is exceeded, the valve opens. After the discharge valve opens, hot water
flows out of the heating installation, and cold water can flow in from the supply pipe (water from
the water supply network), cooling the boiler and installation.
Schematic 14. 2 Diagram of boiler protection by means of cooling valve DBV-2.
POL
ENG
Kocioł
Boiler
Do odpadu
To waste
Wejście wody zimnej
Cold water inlet
Do układu ogrzewania
To heating system
Z układu ogrzewania
From heating system
Zawór kulowy
Ball valve
Zawór redukcyjny
Reduction valve
Filtr
Filter
Zawór zwrotny
Return valve
Zawór bezpieczeństwa
Safety valve
Pompa
Pump