Bentone STG 120/2 Technical specifications

Providing sustainable energy solutions worldwide
CR00122 178 064 25-1 2020-10-29
Installation- and maintenance instruction
STG 120/2
STG 146/2
LME21
MD-DLE 407 B07
Translation of the original instructions.

2Bentone
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352011030141
Designation
Type
Model
Serial no.
Motor supply
Main supply
MADE IN SWEDEN BY
LIGHT OIL 35-90kW 1,25-6,0 cSt 7-14bar
BF 1 KS 76-24
BF 1
BF 1 KS 76-24
1234567
1~230V 1,0A 50Hz IP 20
Man.Year 2019
Cap. Min-Max
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3Bentone
Table of contents
1. General Information __________________________________ 4
2. Technical Data _______________________________________ 7
2.1 Output range _____________________________________ 8
2.2 Description STG 120 _____________________________ 11
3. General instructions _________________________________ 12
3.1 General instructions ______________________________ 12
3.2 Installation and maintenance instructions ____________ 12
3.3 Instructions _____________________________________ 12
3.4 Inspection and maintenance _______________________ 12
3.5 Start up ________________________________________ 12
3.6 Commissioning of installation ______________________ 12
4. Installation _________________________________________ 13
4.1 Delivery check ___________________________________ 13
4.2 Preparations for installation ________________________ 13
4.3 Gas supply______________________________________ 13
4.4 Electric connection _______________________________ 13
4.5 Skeleton diagram CPi_____________________________ 14
4.6 Mounting on the boiler ____________________________ 15
4.7 Installation example ______________________________ 15
4.8 Inspection of gas nozzle before commissioning _______ 16
4.9 Gas nozzle ______________________________________ 17
5. MULTI-BLOC, _______________________________________ 18
5.1 Overview _______________________________________ 18
5.2 Mounting closed position indicator (CPi) _____________ 19
5.3 Adjustment of governor ___________________________ 20
5.4 Adjustment of start gas flow valve V3________________ 20
5.5 Flow adjustment main valve V2_____________________ 20
5.6 Skeleton diagrams _______________________________ 21
6. Setting the burner ___________________________________ 23
6.1 Setting the air pressure switch _____________________ 26
6.2 Setting the min. gas pressure switch ________________ 27
6.3 Recommended excess air when using default setting __ 28
6.4 Determining the gas quantity for the system __________ 28
6.5 Calculating the quantity of gas supplied _____________ 30
6.6 Flame monitoring and ionisation current check________ 31
6.8 UV-Detector_____________________________________ 32
7. Handing over of the installation _______________________ 33
8. Fault location, functional troubles_____________________ 33
9. Electric equipment __________________________________ 34
9.1 Wiring diagram __________________________________ 35
9.2 Control program when disruption; __________________ 37
10. Troubleshooting __________________________________ 39
11. General instructions for gasburners_________________ 42

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1. General Information
This Installation and Maintenance manual:
• is to be regarded as part of the burner and must always be kept near
the installation site
• is intended for use by authorised personnel
• must be read prior to installation
• must be observed by all who work with the burner and associated
system components
• work with the burner may only be carried out by certified installers/
personnel
Enertech AB is not liable for any typographical errors and reserves the right
to make design changes without prior notice.
Safety instructions
• The burner may only be used for its intended purpose in accordance
with the product’s technical data.
• The burner may only be installed and operated by authorised
personnel.
• The product is packaged to prevent damage from occurring during
handling. Handle the product with care. Lifting equipment must be
used to lift larger packages.
• The products must be transported/stored on a level surface in a dry
environment, max. 80% relative humidity, no condensation.
Temperature -20 to +60 °C.
• Check that the burner is compatible with the boiler’s output range.
• All components must be installed without being bent, twisted or
subjected to mechanical or thermal forces which can affect the
components.
• The burner must be installed so that it complies with local regulations
for fire safety, electrical safety, and fuel distribution.
• The gas outlet from the pressure regulator shall be configured in
accordance with applicable regulations and lead to a safe area.
• Make sure when installing the equipment that there is enough space to
service the burner.
• Permitted temperature during operation -10 to +60 °C. Max 80%
relative humidity, no condensation.
• The installer must ensure that the room has adequate air supply.
• The room must comply with local regulations pertaining to its intended
use.
• The installation site must be free of chemicals.
• Burner pipes, fan wheels and air dampers may contain sharp edges.
• The surface temperature of the burner’s components can exceed 60
°C.
• Caution: The burner has moving parts, and there is risk of crushing
injuries.
172 515 01 2018-01-02

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• The electrical installation must be professionally carried out in
accordance with applicable high voltage regulations, as per Enertech’s
recommendations.
• Before servicing, shut off the fuel supply and turn off the power to the
burner.
• Seal inspections must be performed during installation and servicing to
prevent gas leakage.
• Care should be taken by the installer to ensure that no electrical cables
or fuel lines are crushed or otherwise damaged during installation or
servicing.
• If the boiler is equipped with an access hatch, this must be equipped
with a hatch opening switch connected to the burner's safety system.
• When in operation, the burner’s noise level can exceed 85 dBA.
Use hearing protection.
• The burner must not be put into operation without proper safety and
protection devices.
• A Class BE fire extinguisher is recommended.
• It is forbidden to alter thedesign or use accessories which have not
been approved by Enertech in writing.
• Prior to operation, the following points must be checked:
-fitting and installation work has been completed and approved
-electrical installation has been correctly performed
-flue gas ducts and combustion air ducts are not blocked
-all actuators and control and safety devices are in working order and
correctly set
Actions to take if you smell gas
Turn off the equipment and the boiler. Open windows and doors. Prevent
open flames or sparking, e.g. do not turn lights on or off, do not use any
electrical appliances, do not use mobile phones. Open windows and doors.
Close the gas ball valve. Warn residents; do not use doorbells. Evacuate
the building. Notify the installer or gas supplier once the building has been
evacuated.

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Control system 10 years 250,000 starts
Valve control system 10 years 250,000 starts
Pressure switch 10 years 250,000 starts
Ignition system with flame guard 10 years 250,000 starts
UV flame sensor 10000 hrs N/A
Gas pressure regulators 15 years N/A
Gas valve without seal testing 10 years 250,000 starts
Gas valve with seal testing Replacement upon fault detection N/A
Gas pressure switch 10 years 250,000 starts
Safety blow-off system 10 years N/A
Damper motor N/A 500,000 starts
Contactor 10 years 500,000 starts
Burner 1 year 3000 hrs
Inspection of electrical installation 1 year 3000 hrs
Leakage check 1 year 3000 hrs
Filter 1 year replacement at Δp>10 mbar 3000 hrs replacement at Δp>10
mbar
Electrodes Replacement/Cleaning 1 year Replacement/Cleaning 3000 hrs
Brake disc Replacement/Cleaning 1 year Replacement/Cleaning 3000 hrs
Motor 1 year 3000 hrs
Fan wheel 1 Year
Replacement when cleaning
needed/ imbalance
3000 h
Replacement when cleaning
needed/ imbalance
The burner and its components must be recycled according to applicable regulations.
Burner servicing schedule
Servicing must be carried out once a year or after 3000 hours of operation
Component replacement intervals
Delivery check
• Make sure everything is delivered and the goods have not been
damaged during transit.
• If something is wrong with a delivery, report it to the supplier.
• Transport damage must be reported to the shipping company.

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172 525 12 2020-10-06
2. Technical Data
Type designation STG 120/146 Burner head 2
STG 120/2 STG 146/2
Length of
burner tube
Flange A
Measure A
Length of
burner tube
Flange A
Measure A
Standard 1 115 88 145 122
Long design 147 120 245 222
C
A
Ø B
D E
G
F
B C D E F G
STG 120 Ø 89 226 130 273
STG 146 Ø 103 340 253 135 165 305
* Depending on which components that are used, dimensions may vary
• Hot water boilers in intermittent operation
• Gas connection 1/2 -1”
J K L M
STG 120 M10 Ø 90 Ø 125 17
STG 146 Ø 103 Ø 109,5 Ø 145 23,5
K
L
M
J
KM
L
J
STG 120 STG 146
J
K
L
M

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2.1 Output range
1) Calorific value: kWh/m315°C 1013.25 mbar (according to EN676)
2) Dimension and capacity depending on gas quality and available pressure
Capacity kW Gas volume at a
min. output Nm3/h
1)
Gas volume at a
max output Nm3/h
1)
Max. inlet
pressure mbar
Rated inlet pressures
mbar
STG 120/2
G20 15-50 1,45 5,0 360 20
G25 15-50 1,8 6,25 360 20
G30 18-70 0,5 2,7 360 30
G31 18-70 0,7 2,0 360 30
STG 146/2
G20 41-133 4 13,3 360 20
G25 41-133 5,1 16,6 360 20
G30 47-144 1,4 5,5 360 30
G31 47-144 1,8 4,2 360 30
1) A heat value in kWh/Nm3is used for the underlying calculation in normal
ambient conditions: 15°C 1013.25 mbar (as per SS-EN 676)
Calorific value:
G20 Natural gas 10,0 kWh/Nm3
G25 Natural gas 8,0 kWh/Nm3
G31 Propane 26 kWh/Nm3
G30 Butane 34 kWh/Nm3
Gas quantity and capacity vary according to grade of gas and connection
pressure.
Burner correspond to IP20
2.4.1 Electric Specification EN 60335-2-102
Type STG 120 STG 146
Motor 90W, 0,7A, 230V, 50Hz,
2730Rpm
12W, 0,95A, 230V. 50Hz
2750Rpm
The recommended main fuse
motor 6,3 A 6,3 A
Control power 230V 1F ~ 1,0A 230V 1F ~ 2,5A
Sound 79 dBA ± 0,5 dBA 79 dBA ± 0,5 dBA
Measurements according to EN 3746: 2010
Alt.1 The sound level of the burner can be reduced by equipping the burner
with silencer. Installation must be done so it does not prevent air supply
to the burner.
Alt.2 The burner’s noise level can be reduced by connecting the burner’s air
intake to the air duct that opens into an appropriate location. Installation
must be done so it does not prevent air supply to the burner.

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-1,0
0,0
1,0
2,0
3,0
4,0
5,0
30 50 70 90 110 130 150
Capacity kW
Pressure in fire placePressure in fire place
Capacity kW
2.1.1 Working field
STG 146/2
G20 & G25
41-133 kW
STG 146/2
G30 & G31
47-144 kW
Capacity chart according
to EN 676
STG 120/2
G20 & G25
14,5-50 kW
STG 120/2
G30 & G31
17,5-70 kW
!Do not exceed working
field

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2.1.2 Gas categories, approved gases
Only dry gas is permitted for use
Gerätekategorien
Appliance categories
Versorgungsdrücke
Supply pressures
Bestimmungsländer
Countries of destination
II2R/3R 20-360mBar AT, BE, BG, CZ, CY, HR,
DK, FI, FR, DE, GB, HU, IS,
IE, IT, LV, LT, LU, MT, NL,
NO, PL, PT, MK, RO, RS,
SK, SS, ES, SE, CH, TR, GB,
EE
II2H38/P 20-360mBar AT, CH, CY, DK, FI, LT, RO,
SE, SK
II2H3P 20-360mBar GB, IE
II2L38/P 20-360mBar NL, RO
II2E38/P 20-360mBar PL
II2E(R)B 20-360mBar BE
I3P 20-360mBar BE

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2.2 Description STG 120
Components
1. Reset button
2. Gas burner control
3. Transformer
4. Fixing flange
5. Connection MultiBloc
6. Ionisation electrode
7. Inner assembly
8. Brake plate
9. Burner tube
10. Ignition electrode
11. Air damper
12. Front part fan housing
13. Rear part fan housing
14. Air pressure switch
15. Shielding arrangement
fan housing
16. Fan wheel
17. Air adjustment
18. Inner assembly adjustment
19. Motor
20. Electric connection
21. MultiBloc

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172 515 03 2018-01-02
3. General instructions
3.1 General instructions
The installation of the gas burner must be carried out in accordance with
current regulations and standards. The installers of gas burners should
therefore be acquainted with all regulations and ensure that the installation
complies with the requirements. The installation, mounting and adjustment
should be made with the greatest care and only the correct gas should be
used.
3.2 Installation and maintenance
instructions
The maintenance instructions supplied with the burner must be kept at an
easily accessible location in the boiler room.
3.3 Instructions
The user should be thoroughly in-structed in the function of the gas burner
and the whole installation. The supplier must instruct the user.
3.4 Inspection and maintenance
See service schedule.
3.5 Start up
After the burner has been fitted to the boiler and the electric connection, the
leakage control, the venting and the electric function test have been carried
out, the burner will be ready for start-up.
Howerer, study the sections dealing with adjustments of multi-bloc,
combustion air and combustion head. Open the ball valve and switch on the
main switch. If the burner starts the actual adjustment can be made.
3.6 Commissioning of installation
Control of the combustion. The combustion quality is checked by means of a
flue gas analysis device. Adjust the burner to appr. 20%
excess air in accordance with the table. Check the flue gas temperature.
Calculate the efficiency. Check also the actual gas volume on the gas meter
so that the correct input is achieved.

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172 515 03 2018-01-02
4. Installation
4.1 Delivery check
Check that all has been delivered and that the goods have not been
damaged during transport. If that is not the case, please notify the delivery
company. Transport damages should be reported to the forwarding agency.
4.2 Preparations for installation
Check that the measurements and capacity range of the burner are
compatible with the boiler. The power ratings on the type plate refer to the
min. and max. power of the burner.
4.3 Gas supply
For good operating safety, it is important that the gas supply system is
installed correctly.
Consider the following:
1. Check that the burner is approved for the gas quality of the installation.
If not, please contact the supplier.
2. Check that the gas components of the burner are approved for
indicated gas pressure.
3. The gas supply system should be installed in accordance with current
standards.
4. Pipe lines should be run so that service on boiler and burner is
facilitated.
5. Pipe lines should be run so that eventual contaminants cannot come
into contact with the gas components.
6. Gas discharge system must be installed prior to local regulations.
4.4 Electric connection
Before starting the electric installation, the main switch must be turned off.
If the boiler has a 7-pole and a 4-pole Eurostecker connector, these usually
fit directly to the burner. If not, use the connectors included.
(Refer to connection under Electric equipment)
!If an electric connection other than the one recommended by Enertech is used, a risk of damage and
injury can arise.

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172 525 13 2020-10-08
4.5 Skeleton diagram CPi
1. Ball valve
2. Filter
3. Governor
4. Pressure gauge with shut-off cock
5a. Gas pressure switch, mini
5b. Gas pressure switch, maxi
6a. Main valve
6b. Safety valve
1)7. Valve proving system
9. Air pressure switch
10. Electrical connection
11. Solenoid V3
Pos. 5b, 7: Components not required according to EN 676.
1) Required over 1200 kW according to EN 676.

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4.6 Mounting on the boiler
Fit the enclosed flange and gasket to the boiler.If new fixing holes must be
drilled, use the fixing flange as a pattern. Use fixing screws M8-M10.
The gas armature is from the factory mounted in a horizontal position. The
connection of the incoming gas line is made from the right side. Should it
for some reason be necessary to make the gas connection in any other
direction the armature can be turned 180° to the left and upwards. It is
also possible to connect the gas to the multi-bloc straight backwards. The
armature can also be extended so that it comes outside the boiler if there is
not enough room. Ensure that the distance between the inner asembly and
the gas armature is not too long. If the distance is too long there will not be
time for the burner to light.
4.7 Installation example
Connect the gas to the burner by means of the ball valve. To facilitate service
a union nut is used between the gas supply system and the ball valve.
Ensure that the union nut, ball valve and tubing make it easy to remove the
burner for inspection and service.
!Check the gas tightness.
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172 515 21 2018-01-08
4.8 Inspection of gas nozzle before
commissioning
General rules
Care should be taken by the installer to ensure that no electrical cables
or fuel/gas pipes are trapped or damaged during installation or service/
maintenance.
Inner assembly
Check that the ignition and ionisation electrodes are correctly set. In
the figure (see the gas nozzle chapter), the dimensions are specified for
adjustment of the ignition and ionisation electrodes.
Gas quality
Ensure that the burner head is meant for the gas quality to be used (see
capter gas nozzle).
De-aerating
De-aerating of the gas line is conducted, for example, by unscrewing
the screw on the measuring nipple for the connection pressure. Connect
a plastic hose and release the gas in a safe place. Once de-aerating is
completed, be sure to refit the screw on the measuring nipple.
Leakage control
When making a leakage control of the gas supply system the solenoid valve
should be closed. Connect a pressure gauge to the test nipple Pa, see fig.
The test pressure in the system should be 1,5x max. inlet pressure or min.
150 mbar. If any leakage, locate the source by means of soapy water or a
leak location spray. After tightening repeat the test.
Electric function test:
Ensure that phase and neutral are not reversed. The gas shut-off cock
should be closed.To prevent the gas pressure switch from locking out it
should be linked temporarily.
After the main switch has been switched on and the thermostats have been
adjusted the pre-purging period begins (30-35sec.). At the end of this period
the pre-ignition period starts (0,5-2,5 sec. dependent on the design of the
gas control). The gas valve is energized and opens and flame is established.
At the end of the safety time (2-3 sec.) the gas control locks out. The
solenoid valve and the motor will be "dead". Remove the link from the gas
pressure switch after the test is finished.
!If the burner is directly
connected, ensure
that all components on
the burner are without
power.

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4.9 Gas nozzle
Inner assembly
Natural, LPG
Natural gasLPG 2,5
8

18 Bentone
Max. inlet pressure: 360 mbar. Adjustable governor pressure:
405 - 412 S5x = 4 - 50 mbar
415 - 420 S2x = 4 - 20 mbar
415 - 420 S5x = 20 - 50 mbar
4
321
17
16
15
14
11
10
9
8
7
6
5
20
1. Electrical connection for V1, V2, V3
(DIN EN 175 301-803 connector) (option)
2. Operation display V1, V2 (optional)
3. Gouvernor adjustment
4. Setting cap hydraulic brake
5. Hydraulic brake or setting plate gas flow
6. Solenoid
7. Test point connection G 1/8 possible
8. Test point connection G 1/8 downstream of valve1,
possible on both sides
9. Outlet flange
10. Test point connection M4 downstream of valve 2
11. Gas flow direction
12. Bypass throttle, V3 Pilot flame
13. Vent nozzle, regulator
14. Filter (below cover)
15. Inlet flange
16. Test point connection G 1/8 upstream of filter,
possible on both sides.
17. Test point connection G 1/8 possible
18. Pressure switch (option)
19. Electrical connection for pressure switch
(DIN EN 175 301-803 connector) (option)
20. Test point connection G 1/8 upstream of V1,
possible on both sides
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
5. MULTI-BLOC,
MB-DLE 407 B07 S22 GW150A5
5.1 Overview
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5.2 Mounting closed position indicator (CPi)
C
B
12
3
F
A
X50
1. Interrupt gas supply.
2. Remove G 1/8 seal plug and O ring from valve bottom.
3. Screw closed position indicator with new O ring (9,5 x 1.6).
4. Tighten using open-ended spanner WAF 12.
5. Electrical connection
Remove cover A.
Electrical connection to screw
terminals 1,2,3.
6. Perform leakage and function test.
7. Set switching point
Remove cover B if there is no
contact from terminal 1 to terminal 3 when valve is closed.
Rotate setting screw C to ” + ” until switching point is reached.
Then rotate the setting screw by another scale division.
Check function by activating the valve.
8. Re-set switching point Turn setting screw C back in arrow direction
”–” to the stop; proceed as described in 7.
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5.3 Adjustment of governor
Adjust outlet pressure from governor by means of a screw . Min. and
max. outlet pressures corresponds to appr. 60 turns of the spring. It is not
possible to change pressure springs in order to change the outlet pressure.
Turn to the right = the outlet pressure is increased
Turn to the left = the outlet pressure is reduced
5.4 Adjustment of start gas flow valve V3
Unplug X50 to disconnect V2 to make it possible to adjust start gas flow.
Remove protection cap c.
Turn the adjustment screw e to the desired start gas flow.
Turn to the right = the start gas flow is reduced
Turn to the left = the start gas flow is increased
Adjust start gas flow to desired value. Connect contact X50
5.5 Flow adjustment main valve V2
For adjustment of main gas flow V2
Loosen the fixing screw a. Turn the hydraulic device b:
to the right = the gas flow is reduced
to the left = the gas flow is increased
Do not forget to tighten the fixing screw again.
The flow adjustment can also be made by means of the governor. Adjust the
outlet pressure to a value giving the desired gas flow on the fully open valve.
At small capacities (gas flows) it is also necessary to adjust as above.
Flow adjustment
Adjustment of governor
Adjustment of V2 damper
d
c
C
e:under cap
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