Unigas LG70 L-.TN 10 Series Operating manual

M039135CG Rev. 6.2 07/2020
BURNERS - BRUCIATORI - BRULERS - BRENNER - QUEMADORES - ГОРЕЛКИ
Idea Series
Gas burners
MANUAL OF INSTALLATION - USE - MAINTENANCE
LG/NG70
LGX/NGX70
LG/NG90

2
DANGERS, WARNINGS AND NOTES OF CAUTION
THIS MANUAL IS SUPPLIED AS AN INTEGRAL AND ESSENTIAL PART OF THE PRODUCT AND MUST BE DELIVERED TO THE
USER.
INFORMATION INCLUDED IN THIS SECTION ARE DEDICATED BOTH TO THE USER AND TO PERSONNEL FOLLOWING
PRODUCT INSTALLATION AND MAINTENANCE.
THE USER WILL FIND FURTHER INFORMATION ABOUT OPERATING AND USE RESTRICTIONS, IN THE SECOND SECTION
OF THIS MANUAL. WE HIGHLY RECOMMEND TO READ IT.
CAREFULLY KEEP THIS MANUAL FOR FUTURE REFERENCE.
1) GENERAL INTRODUCTION
The equipment must be installed in compliance with the regulations in
force, following the manufacturer’s instructions, by qualified personnel.
Qualified personnel means those having technical knowledge in the
field of components for civil or industrial heating systems, sanitary hot
water generation and particularly service centres authorised by the
manufacturer.
Improper installation may cause injury to people and animals, or
damage to property, for which the manufacturer cannot be held liable.
Remove all packaging material and inspect the equipment for integrity.
In case of any doubt, do not use the unit - contact the supplier.
The packaging materials (wooden crate, nails, fastening devices, plastic
bags, foamed polystyrene, etc), should not be left within the reach of chil-
dren, as they may prove harmful.
Before any cleaning or servicing operation, disconnect the unit from
the mains by turning the master switch OFF, and/or through the cut-
out devices that are provided.
Make sure that inlet or exhaust grilles are unobstructed.
In case of breakdown and/or defective unit operation, disconnect the
unit. Make no attempt to repair the unit or take any direct action.
Contact qualified personnel only.
Units shall be repaired exclusively by a servicing centre, duly authorised
by the manufacturer, with original spare parts and accessories.
Failure to comply with the above instructions is likely to impair the unit’s
safety.
To ensure equipment efficiency and proper operation, it is essential that
maintenance operations are performed by qualified personnel at regular
intervals, following the manufacturer’s instructions.
When a decision is made to discontinue the use of the equipment,
those parts likely to constitute sources of danger shall be made harm-
less.
In case the equipment is to be sold or transferred to another user, or in
case the original user should move and leave the unit behind, make
sure that these instructions accompany the equipment at all times so
that they can be consulted by the new owner and/or the installer.
This unit shall be employed exclusively for the use for which it is
meant. Any other use shall be considered as improper and, therefore,
dangerous.
The manufacturer shall not be held liable, by agreement or otherwise, for
damages resulting from improper installation, use and failure to comply
with the instructions supplied by the manufacturer.The occurrence of any
of the following circustances may cause explosions, polluting unburnt
gases (example: carbon monoxide CO), burns, serious harm to people,
animals and things:
- Failure to comply with one of the WARNINGS in this chapter
- Incorrect handling, installation, adjustment or maintenance of the burner
- Incorrect use of the burner or incorrect use of its parts or optional supply
2) SPECIAL INSTRUCTIONS FOR BURNERS
The burner should be installed in a suitable room, with ventilation ope-
nings complying with the requirements of the regulations in force, and
sufficient for good combustion.
Only burners designed according to the regulations in force should be
used.
This burner should be employed exclusively for the use for which it
was designed.
Before connecting the burner, make sure that the unit rating is the
same as delivery mains (electricity, gas oil, or other fuel).
Observe caution with hot burner components. These are, usually, near
to the flame and the fuel pre-heating system, they become hot during
the unit operation and will remain hot for some time after the burner
has stopped.
When the decision is made to discontinue the use of the burner, the user
shall have qualified personnel carry out the following operations:
a Remove the power supply by disconnecting the power cord from the
mains.
b Disconnect the fuel supply by means of the hand-operated shut-off
valve and remove the control handwheels from their spindles.
Special warnings
Make sure that the burner has, on installation, been firmly secured to
the appliance, so that the flame is generated inside the appliance fire-
box.
Before the burner is started and, thereafter, at least once a year, have
qualified personnel perform the following operations:
a set the burner fuel flow rate depending on the heat input of the
appliance;
b set the flow rate of the combustion-supporting air to obtain a combu-
stion efficiency level at least equal to the lower level required by the
regulations in force;
c check the unit operation for proper combustion, to avoid any harmful or
polluting unburnt gases in excess of the limits permitted by the regula-
tions in force;
d make sure that control and safety devices are operating properly;
e make sure that exhaust ducts intended to discharge the products of
combustion are operating properly;
f on completion of setting and adjustment operations, make sure that all
mechanical locking devices of controls have been duly tightened;
g make sure that a copy of the burner use and maintenance instructions
is available in the boiler room.
In case of a burner shut-down, reser the control box by means of the
RESET pushbutton. If a second shut-down takes place, call the Tech-
nical Service, without trying to RESET further.
The unit shall be operated and serviced by qualified personnel only, in
compliance with the regulations in force.
3) GENERAL INSTRUCTIONS DEPENDING ON FUEL USED
3a) ELECTRICAL CONNECTION
For safety reasons the unit must be efficiently earthed and installed as
required by current safety regulations.
It is vital that all saftey requirements are met. In case of any doubt, ask
for an accurate inspection of electrics by qualified personnel, since the
manufacturer cannot be held liable for damages that may be caused
by failure to correctly earth the equipment.
Qualified personnel must inspect the system to make sure that it is
adequate to take the maximum power used by the equipment shown
on the equipment rating plate. In particular, make sure that the system
cable cross section is adequate for the power absorbed by the unit.
No adaptors, multiple outlet sockets and/or extension cables are per-
mitted to connect the unit to the electric mains.
An omnipolar switch shall be provided for connection to mains, as
required by the current safety regulations.
The use of any power-operated component implies observance of a
few basic rules, for example:
-do not touch the unit with wet or damp parts of the body and/or with
bare feet;
-do not pull electric cables;
-do not leave the equipment exposed to weather (rain, sun, etc.)
unless expressly required to do so;
-do not allow children or inexperienced persons to use equipment;
The unit input cable shall not be replaced by the user.
In case of damage to the cable, switch off the unit and contact quali-
fied personnel to replace.
When the unit is out of use for some time the electric switch supplying
all the power-driven components in the system (i.e. pumps, burner,
etc.) should be switched off.

3
3b) FIRING WITH GAS, LIGHT OIL OR OTHER FUELS
GENERAL
The burner shall be installed by qualified personnel and in compliance
with regulations and provisions in force; wrong installation can cause
injuries to people and animals, or damage to property, for which the
manufacturer cannot be held liable.
Before installation, it is recommended that all the fuel supply system
pipes be carefully cleaned inside, to remove foreign matter that might
impair the burner operation.
Before the burner is commissioned, qualified personnel should inspect
the following:
a the fuel supply system, for proper sealing;
b the fuel flow rate, to make sure that it has been set based on the firing
rate required of the burner;
c the burner firing system, to make sure that it is supplied for the desig-
ned fuel type;
d the fuel supply pressure, to make sure that it is included in the range
shown on the rating plate;
e the fuel supply system, to make sure that the system dimensions are
adequate to the burner firing rate, and that the system is equipped with
all the safety and control devices required by the regulations in force.
When the burner is to remain idle for some time, the fuel supply tap or
taps should be closed.
SPECIAL INSTRUCTIONS FOR USING GAS
Have qualified personnel inspect the installation to ensure that:
a the gas delivery line and train are in compliance with the regulations
and provisions in force;
b all gas connections are tight;
c the boiler room ventilation openings are such that they ensure the air
supply flow required by the current regulations, and in any case are
sufficient for proper combustion.
Do not use gas pipes to earth electrical equipment.
Never leave the burner connected when not in use. Always shut the
gas valve off.
In case of prolonged absence of the user, the main gas delivery valve
to the burner should be shut off.
Precautions if you can smell gas
a do not operate electric switches, the telephone, or any other item likely
to generate sparks;
b immediately open doors and windows to create an air flow to purge the
room;
c close the gas valves;
d contact qualified personnel.
Do not obstruct the ventilation openings of the room where gas
appliances are installed, to avoid dangerous conditions such as the
development of toxic or explosive mixtures.
DIRECTIVES AND STANDARDS
Gas burners
European directives
-Regulation 2016/426/UE (appliances burning gaseous fuels)
-2014/35/UE (Low Tension Directive)
-2014/30/UE (Electromagnetic compatibility Directive)
-2006/42/EC (Machinery Directive)
Harmonized standards
-UNI EN 676 (Automatic forced draught burners for gaseous fuels)
-EN 55014-1 (Electromagnetic compatibility- Requirements for house
hold appliances, electric tools and similar apparatus)
-EN 60204-1:2006 (Safety of machinery – Electrical equipment of
machines.)
-CEI EN 60335-1 (Specification for safety of household and similar
electrical appliances);
-CEI EN 60335-2-102 (Household and similar electrical appliances.
Safety. Particular requirements for gas, oil and solid-fuel burning
appliances having electrical connections).
-UNI EN ISO 12100:2010 (Safety of machinery - General principles for
design - Risk assessment and risk reduction);
Light oil burners
European directives
-2014/35/UE (Low Tension Directive)
-2014/30/UE (Electromagnetic compatibility Directive)
-2006/42/EC (Machinery Directive)
Harmonized standards
-UNI EN 267-2011(Automatic forced draught burners for liquid fuels)
-EN 55014-1 (Electromagnetic compatibility- Requirements for house
hold appliances, electric tools and similar apparatus)
-EN 60204-1:2006 (Safety of machinery – Electrical equipment of
machines.)
-CEI EN 60335-1 (Specification for safety of household and similar
electrical appliances);
-CEI EN 60335-2-102 (Household and similar electrical appliances.
Safety. Particular requirements for gas, oil and solid-fuel burning
appliances having electrical connections).
-UNI EN ISO 12100:2010 (Safety of machinery - General principles for
design - Risk assessment and risk reduction);
Heavy oil burners
European Directives
-2014/35/UE (Low Tension Directive)
-2014/30/UE (Electromagnetic compatibility Directive)
-2006/42/EC (Machinery Directive)
Harmonized standards
-UNI EN 267(Automatic forced draught burners for liquid fuels)
-EN 55014-1 (Electromagnetic compatibility- Requirements for house
hold appliances, electric tools and similar apparatus)
-EN 60204-1:2006 (Safety of machinery – Electrical equipment of
machines.)
-CEI EN 60335-1 (Specification for safety of household and similar
electrical appliances);
-CEI EN 60335-2-102 (Household and similar electrical appliances.
Safety. Particular requirements for gas, oil and solid-fuel burning
appliances having electrical connections).
-UNI EN ISO 12100:2010 (Safety of machinery - General principles for
design - Risk assessment and risk reduction);

4
Gas - Light oil burners
European Directives
-Regulation 2016/426/UE (appliances burning gaseous fuels)
-2014/35/UE (Low Tension Directive)
-2014/30/UE (Electromagnetic compatibility Directive)
-2006/42/EC (Machinery Directive)
Harmonized standards
-UNI EN 676 (Automatic forced draught burners for gaseous fuels)
-UNI EN 267(Automatic forced draught burners for liquid fuels)
-EN 55014-1 (Electromagnetic compatibility- Requirements for house
hold appliances, electric tools and similar apparatus)
-EN 60204-1:2006 (Safety of machinery – Electrical equipment of
machines.)
-CEI EN 60335-1 (Specification for safety of household and similar
electrical appliances);
-CEI EN 60335-2-102 (Household and similar electrical appliances.
Safety. Particular requirements for gas, oil and solid-fuel burning
appliances having electrical connections).
-UNI EN ISO 12100:2010 (Safety of machinery - General principles for
design - Risk assessment and risk reduction);
Gas - Heavy oil burners
European directives:
-Regulation 2016/426/UE (appliances burning gaseous fuels)
-2014/35/UE (Low Tension Directive)
-2014/30/UE (Electromagnetic compatibility Directive)
-2006/42/EC (Machinery Directive)
Harmonized standards
-UNI EN 676 (Automatic forced draught burners for gaseous fuels)
-EN 55014-1 (Electromagnetic compatibility- Requirements for house
hold appliances, electric tools and similar apparatus)
-EN 60204-1:2006 (Safety of machinery – Electrical equipment of machi-
nes.)
-CEI EN 60335-1 (Specification for safety of household and similar electri-
cal appliances);
-CEI EN 60335-2-102 (Household and similar electrical appliances.
Safety. Particular requirements for gas, oil and solid-fuel burning
appliances having electrical connections).
-UNI EN ISO 12100:2010 (Safety of machinery - General principles for
design - Risk assessment and risk reduction);
Industrial burners
European directives
-Regulation 2016/426/UE (appliances burning gaseous fuels)
-2014/35/UE (Low Tension Directive)
-2014/30/UE (Electromagnetic compatibility Directive)
-2006/42/EC (Machinery Directive)
Harmonized standards
-EN 55014-1 (Electromagnetic compatibility- Requirements for house
hold appliances, electric tools and similar apparatus)
-EN 746-2 (Industrial thermoprocessing equipment - Part 2: Safety requi-
rements for combustion and fuel handling systems)
-UNI EN ISO 12100:2010 (Safety of machinery - General principles for
design - Risk assessment and risk reduction);
-EN 60204-1:2006 (Safety of machinery – Electrical equipment of machi-
nes.)
-EN 60335-2 (Electrical equipment of non-electric appliances for house-
hold and similar purposes. Safety requirements)
Burner data plate
For the following information, please refer to
the data plate:
burner type and burner model: must be
reported in any communication with the
supplier
burner ID (serial number): must be repor-
ted in any communication with the supplier
date of production (year and month)
information about fuel type and network
pressure
SYMBOLS USED
Figures, illustrations and images used in this manual may differ in appearance from
the actual product.
WARNING!
Failure to observe the warning may result
in irreparable damage to the unit or
damage to the environment
DANGER!
Failure to observe the warning may result
in serious injuries or death.
WARNING!
Failure to observe the warning may result
in electric shock with lethal consequen-
ces
Type --
Model --
Year --
S.Number --
Output --
Oil Flow --
Fuel --
Category --
Gas Pressure --
Viscosity --
El.Supply --
El.Consump. --
Fan Motor --
Protection --
Drwaing n° --
P.I.N. --
BURNER SAFETY
The burners - and the configurations described below - comply with the
regulations in force regarding health, safety and the environment. For
more in-depth information, refer to the declarations of conformity that are
an integral part of this Manual.
Residual risks deriving from misuse and prohibitions
The burner has been built in order to make its operation safe; there are,
however, residual risks.
DANGER! Incorrect motor rotation can seriously
damage property and injure people.
Do not touch any mechanical moving parts with your hands
or any other part of your body. Injury hazard
Do not touch any parts containing fuel (i.e. tank and pipes).
Scalding hazard
Do not use the burner in situations other than the ones pro-
vided for in the data plate.
Do not use fuels other than the ones stated.
Do not use the burner in potentially explosive environ-
ments.
Do not remove or by-pass any machine safety devices.
Do not remove any protection devices or open the burner
or any other component while the burner is running.
Do not disconnect any part of the burner or its components
while the burner is running.
Untrained staff must not modify any linkages.
After any maintenance, it is important to restore the protec-
tion devices before restarting the machine.
All safety devices must be kept in perfect working order.
Personnel authorized to maintain the machine must always
be provided with suitable protections.
ATTENTION: while running, the parts of the burner near
the generator (coupling flange) are subject to overheating.
Where necessary, avoid any contact risks by wearing sui-
table PPE.

5
Burner model identification
Burners are identified by burner type and model. Burner model identification is described as follows.
Specifications
TypeNG90 Model M-. AB. S. *. A. 0. 15
(1) (2) (3) (4) (5) (6) (7) (8)
(1) BURNER TYPE
NG - Natural gas burner
LG - L.P.G. burner
LGX - Natural gas Low NOx burners
NGX - Natural gas Low NOx burners
(2) FUEL M - Natural gas L - LPG
(3) OPERATION TN - Single stage AB - Double stage
(4) BLAST TUBE S - Standard L - Extended
(5) DESTINATION COUNTRY * - see data plate
(6) BURNER VERSION A = StandardStandard
(7) EQUIPMENT 0 = 2 gas valves
1= 2 Gas valves + gas proving system (option)
(8) GAS CONNECTION 10= 3/8” = Rp1/2 15= 1/2” = Rp1/2 20= 3/4” = Rp3/4
BURNERS NG70
M-.TN...10
NG70
M-.TN...15
NG90
M-.TN...10
NG90
M-.TN...15
NG90
M-.TN...20
Output min. - max. kW 30 - 70 40 - 85
Fuel Natural gas
Category (see next paragraph)
Gas rate min.-max. (Stm3/h) 3,2 - 7,4 4,2 - 9,0
Gas pressure min.-max. mbar (see Note 2)
Power supply 230V 1N.ac - 50 Hz
Total power consumption kW 0,40
Electric motor kW 0,10
Protection IP40
Approx. weight kg 14
Valves size / Gas connection 3/8 / ”Rp1/2 1/2” / Rp1/2 3/8” / Rp1/2 1/2” / Rp1/2 3/4” / Rp3/4
Operation Single stage
Operating temperature °C -10 ÷ +50
Storage TemperatureStorage Temperature °C -20 ÷ +60
Working serviceWorking service* IntermittentIntermitent
BURNERS NG70
M-.AB...10
NG70
M-.AB...15
NG90
M-.AB...10
NG90
M-.AB...15
NG90
M-.AB...20
Output min. - max. kW 19 - 68 22 - 85
Fuel Natural gas
Category (see next paragraph)
Gas rate min.-max. (Stm3/h) 2 - 7 2,3 - 9
Gas pressure min.-max. mbar (see Note 2)
Power supply 230V 1N.ac - 50 Hz
Total power consumption kW 0.40
Electric motor kW 0,10
Protection IP40
Approx. weight kg 14
Valves size - Gas connection 3/8” - Rp1/2 1/2” - Rp1/2 1/2” - Rp1/2 1/2” - Rp1/2 3/4” - Rp3/4
Operation High-low flame
Operating temperature °C -10 ÷ +50
Storage TemperatureStorage Temperature °C -20 ÷ +60
Working serviceWorking service* IntermittentIntermitent
PART I - INSTALLATION

6
Low NOx burners
BURNERS LG70 L-.TN...10 LG70 L-.TN...15 LG90 L-.TN...10 LG90 L-.TN...15
Output min. - max. kW 30 - 70 40 - 85
Fuel L.P.G. L.P.G. L.P.G. L.P.G.
Category I3B/P
Gas rate min.-max. (Stm3/h) 1,2 - 2,7 1,5 - 3,3
Gas pressure min.-max. mbar (see Note 2)
Power supply 230V 1N.ac - 50 Hz
Total power consumption kW 0,40
Electric motor kW 0,10
Protection IP40
Approx. weight kg 14
Valves size / Gas connection 3/8” / Rp1/2 1/2” / Rp1/2 3/8” / Rp1/2 1/2” / Rp1/2
Operation Single stage
Operating temperature °C -10 ÷ +50
Storage TemperatureStorage Temperature °C -20 ÷ +60
Working serviceWorking service* IntermittentIntermittentIntermitent
BURNERS LG70 L-.AB...10 LG70 L-.AB...15 LG90 L-.AB...10 LG90 L-.AB...15
Output min. - max. kW 20 - 65 22 - 80
Fuel L.P.G.
Category I3B/P
Gas rate min.-max. (Stm3/h) 0,8 - 2,5 0,8 - 2,5 0,8 - 3,0 0,8 - 3,0
Gas pressure min.-max. mbar (see Note 2)
Power supply 230V 1N.ac- 50 Hz
Total power consumption kW 0.40
Electric motor kW 0.10
Protection IP40
Approx. weight kg 14
Valves size / Gas connection 3/8” / Rp1/2 1/2” / Rp1/2 1/2” / Rp1/2 1/2” / Rp1/2
Operation High-low flame
Operating temperature °C -10 ÷ +50
Storage TemperatureStorage Temperature °C -20 ÷ +60
Working serviceWorking service* IntermittentIntermittentIntermitent
BURNERS NGX70 M-
.TN...15
NGX70 M-
.TN...20
LGX70 M-
.TN...15
LGX70 M-
.TN...20
NGX70 M-
.AB...15
NGX70 M-
.AB...20
Output min. - max. kW 40 - 65 21 - 65
Fuel Natural gas I3B/P Natural gas
Category (see next paragraph)
Gas rate min.-max. (Stm3/h) 4.2 - 6,9 1,5 - 2,4 2,2 - 6,9
Gas pressure min.-max. mbar (see Note 2)
Power supply 230V 1N.ac - 50 Hz
Total power consumption kW 0,40
Electric motor kW 0,10
Protection IP40
Approx. weight kg 14
Valves size / Gas connection 3/8” / Rp1/2 1/2” / Rp1/2 3/8” / Rp1/2 1/2” / Rp1/2 3/8” / Rp1/2 1/2” / Rp1/2
Operation Single stage Single stage High-low flame
°C -10 ÷ +50
Storage TemperatureStorage Temperature °C -20 ÷ +60
Working serviceWorking service* IntermittentIntermittentIntermitent

7
* NOTE ON THE WORKING SERVICE: the control box automatically stops after 24h of continuous working. The control box
immediately starts up, automatically.
Country and usefulness gas categories
Note1: All gas flow rates are referred to Stm3/h (1013 mbar absolute pressure, 15 °C temperature) and are valid for G20 gas
(nett calorific value Hi = 34.02 MJ/Stm3); for L.P.G. (nett calorific value Hi = 93.5 MJ/Stm3)
Note2: Maximum gas pressure = 65mbar (with Dungs MBC 65 DLE valves)
Maximum gas pressure = 360mbar (with Dungs MB-DLE valves)
Minimum gas pressure = see gas curves.
GAS
CAT COUNTRY
I2H AT ES GR SE FI IE HU IS NO CZ DK GB IT PT CY EE LV SI MT SK BG LT RO TR CH
I2E LUPL-----------------------
I2E( R BE------------------------
(*) NL------------------------
I2ELL DE------------------------
I2Er FR------------------------
(*) Only for I2EK : the appliance was configured for the appliance category K (I2K) and is suitable for the use of G and G+ distribution gases according to the specifications as
included in the NTA 8837:2012 Annex D with a Wobbe index of 43.46 – 45.3 MJ/m3 (dry, 0 °C, upper value) or 41.23 – 42.98 (dry, 15 °C, upper value). This appliance can
moreover be converted and/or be calibrated for the appliance category E (I2E). This therefore implies that the appliance “is suitable for G+ gas and H gas or is demonstrably
suitable for G+ gas and can demonstrably be made suitable for H gas” within the meaning of the “Dutch Decree of 10 May 2016 regarding amendment of the Dutch Gas
Appliances Decree and the Dutch Commodities (Administrative Fines) Act in connection with the changing composition of gas in the Netherlands as well as technical
amendment of some other decrees.

8
OVERALL DIMENSIONS (mm) (NG70 - NG90)
Burner flange and boiler drilling template
Rp A B C D E F G H J K L M N O P Q R S Tmin. W X Y
min. max. min. max. min. max. min. max. min. max.
NG70 ..S.. 1/2" 365 34 79 287 332 365 75 291 Ø80 Ø95 99 162 218 M8 155 86 138 110 285 330 118 163 168 14 438 299 Ø78,5
NG70 ..L.. 1/2" 443 34 157 287 410 365 75 291 Ø80 Ø95 99 162 218 M8 155 86 138 110 285 408 118 241 168 14 438 299 Ø78,5
NG90 ..S.. 1/2" 365 34 70 295 331 365 75 291 Ø80 Ø95 102 162 218 M8 155 86 138 110 293 329 125 203 168 2 441 299 Ø78,5
NG90 ..L.. 1/2" 443 34 149 295 409 365 75 291 Ø80 Ø95 102 162 218 M8 155 86 138 110 293 407 125 239 168 2 441 299 Ø78,5
BS = standard blast tube BL = long blast tube DN = gas valves size
B*: SPECIAL blast tube lengths must be agreed with Cib Unigas

9
NGX70
Burner flange and boiler drilling template
AB CDEFGHJKLMNOPQ RSTWX
min. max. min. max. min. max. min. max. min. max.
Blast tube
Standard LGX-NGX70 383 76 76 299 299 304 14 291 Ø80 Ø98 99 145 218 M8 153 96 120 108 296 296 130 130 167 7 438 291
Extended LGX-NGX70 451 66 149 294 377 304 14 291 Ø80 Ø98 99 145 218 M8 153 96 120 108 292 375 125 208 167 2 438 291
BS = standard blast tube BL = long blast tube DN = gas valves size
B*: SPECIAL blast tube lengths must be agreed with Cib Unigas

10
Performance curves
L.P.G. Burners
BACKPRESSURE IN
COMBUSTION CHAMBER mbar
NG70 M-.TN...
kW
NG70 M-.AB...
kW
BACK PRESSURE IN
COMBUSTION CHAMBER mbar
NG90 M-.TN...
kW
NG90 M-.AB...
kW
L.P.G. Burners
BACK PRESSURE IN
COMBUSTION CHAMBER mbar
LG70 L-.TN...
kW
LG70 L-.AB...
kW
BACK PRESSURE IN
CCOMBUSTION CHAMBER mbar
LG90 L-.TN...
kW
LG90 L-.AB...
kW
-1
-0,5
0
0,5
1
1,5
2
2,5
3
20 30 40 50 60 70 80
-1
-0,5
0
0,5
1
1,5
2
2,5
3
10 20 30 40 50 60 70 80
-1
-0,5
0
0,5
1
1,5
2
2,5
3
30 40 50 60 70 80 90 100
-1
-0,5
0
0,5
1
1,5
2
2,5
3
10 20 30 40 50 60 70 80 90
-1
-0,5
0
0,5
1
1,5
2
2,5
3
20 30 40 50 60 70 80
-1
-0,5
0
0,5
1
1,5
2
2,5
3
10 20 30 40 50 60 70 80
-1
-0,5
0
0,5
1
1,5
2
2,5
3
30 40 50 60 70 80 90 100
-1
-0,5
0
0,5
1
1,5
2
2,5
3
10 20 30 40 50 60 70 80 90

11
To get the input in kcal/h, multiply value in kW by 860.
Data are referred to standard conditions: atmospheric pressure at 1013mbar, ambient temperature at 15°C.
Pressure in the network / gas flow rate curves
Low NOx burners
BACK PRESSURE IN
COMBUSTION CHAMBER mbar
NGX70 M-.TN...
kW
NGX70 M-.AB...
kW
L.P.G. Burners
GAS PRESSURE mbar
NG70 M-.TN...
Gas rate Stm3/h
NG70 M-.AB...
Gas rate Stm3/h
GAS PRESSURE mbar
NG90 M-.TN...
Gas rate Stm3/h
NG90 M-.AB...
Gas rate Stm3/h
L.P.G. Burners
GAS PRESSURE mbar
LG70 L-.TN...
Gas rate Stm3/h
LG70 L-.AB...
Gas rate Stm3/h
-1
-0,5
0
0,5
1
1,5
2
2,5
3
35 45 55 65 75
-1
-0,5
0
0,5
1
1,5
2
2,5
3
10 20 30 40 50 60 70 80
0
5
10
15
20
25
30
35
23456789
Rp ½" (10)
Rp ½" (15)
0
4
8
12
16
20
24
28
32
123456 78
Rp ½" (15)
Rp ½" (10)
0
5
10
15
20
25
30
35
40
45
50
45678910
Rp ½" (10)
Rp ¾" (20)
Rp ½" (15)
0
5
10
15
20
25
30
35
40
45
2345678910
Rp ½" (15)
Rp ½" (10)
Rp ¾" (20)
0
2
4
6
8
10
12
14
11,5 22,53
Rp ½" (10)
Rp ½" (15)
0
2
4
6
8
10
12
0,5 1 1,5 2 2,5 3
Rp ½" (15)
Rp ½" (10)

12
GAS PRESSURE mbar
LG90 L-.TN...
Gas rate Stm3/h
LG90 L-.AB...
Gas rate Stm3/h
Low NOx burners
GAS PRESSURE mbar
NGX70 M-.TN...
Gas rate Stm3/h
NGX70 M-.AB...
Gas rate Stm3/h
The values in the diagrams refer to natural gas with a calorific value of 8125 kcal/Stm3 (15°C, 1013 mbar) and a density of
0.714 kg/Stm3 .
The values in the diagrams refer to GPL with a calorific value of 22300 kcal/Stm3 (15°C, 1013 mbar) and a density of 2.14 kg/
Stm3. When the calorific value and the density change, the pressure values should be adjusted accordingly.
2
4
6
8
10
12
14
16
18
11,522,533,54
Rp ½" (10)
Rp ½" (15)
0
2
4
6
8
10
12
14
16
18
0,5 1,5 2,5 3,5
Rp ½" (15)
Rp ½" (10)
6
8
10
12
14
16
18
20
22
24
26
45678
R
p
½"
(
15
)
R
p
¾"
(
20
)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
2345678
Rp ½" (15)
Rp ¾" (20)
Where: Natural gas pressure shown in diagram
Real gas pressure
Natural gas flow rate shown in diagram
Real gas flow rate
Natural gas density shown in diagram
Real gas density

13
MOUNTINGS AND CONNECTIONS
PackingThe burners are despatched in cardboard packages whose dimensions are: 400mm x 300mm x 520mm (L x P x H)
Packing cases of this type are affected by humidity; the maximum number of cases to be stacked is indicated outside the packing.
The following are placed in each packing case.
1 Burner with gas train;
1 gasket to be inserted between the burner and the boiler;
1 envelope containing this manual
When disposing of the burner packing and if the packing is scrapped follow the procedures laid down in the current legislation regarding
the disposal of materials.Fitting the burner to the boiler
To install the burner into the boiler, proceed as follows:
1 on the boiler’s door hole, fix the 4 stud bolts according to the drilling template showed on paragraph “Overall dimensions”
2 fix the flange of the burner to the boiler;
3 install the burner into the boiler;
4 according to the reference showed on Fig. 2, fix the flange to the boiler’s stud bolts D, without completely fastening;
5 loosen the VS screws in order to let the blast tube move back and forth;
6 install the burner making the blast tube move into the flange as to reach the right position according to the boiler/utilisation
7 fasten the VS screws:
8 tighten the 4 stud blolts D completely;
9 seal the space between the blast tube and the refractory lining with appropriate insulating material (ceramic fibre cord or refractory
cement).
Matching the burner to the boiler
The burners described in this manual have been tested with combustion chambers that comply with EN676 regulation and whose
dimensions are described in the diagram . In case the burner must be coupled with boilers with a combustion chamber smaller in dia-
meter or shorter than those described in the diagram, please contact the supplier, to verify that a correct matching is possible, with
respect of the application involved. To correctly match the burner to the boiler verify the necessary input and the pressure in combu-
stion chamber are included in the burner performance curve; otherwise the choice of the burner must be revised consulting the burner
manufacturer. To choose the blast tube lenght follow the instructions of the boiler manufacturer. In absence of these consider the fol-
lowing:
Cast-iron boilers, three pass flue boilers (with the first pass in the rear part): the blast tube must protrude no more than 100 mm into
the combustion chamber.
Pressurised boilers with flame reversal: in this case the blast tube must penetrate at least 50 - 100 mm into combustion chamber in
respect to the tube bundle plate.
The length of the blast tubes does not always allow this requirement to be met, and thus it may be necessary to use a suitably- sized
Fig. 1 Fig. 2
VS D
D

14
spacer to move the burner backwards or to design a blast tube tha suites the utilisation (please, contact the manifacturer).
Installing the gas train
The following diagram shows the gas train components which are included in the delivery and those which must be fitted by the custo-
mer. The diagram complies with regulations in force.
Keys
1 Burner
2 Multibloc valves group: Multibloc DUNGS (2 gas valves + gas pressure switch + filter + pressure governor)
3 Bellow joint
4 Manual cutoff valve
Once the train is installed, connect the gas valves group plug.
Fig. 3
Key
a) Heat output in kW
b) Length of the flame tube in meters
c) Flame tube firing intensity in MW/m3
d) Combustion chamber diameter (m)
Fig. 3 - Firing intensity, diameter and lenght of the test flame tube as a function of the heat
input in kW.
ATTENTION: BEFORE EXECUTING THE CONNECTIONS TO THE GAS PIPE NETWORK, BE SURE THAT THE
MANUAL CUTOFF VALVES ARE CLOSED. READ CAREFULLY THE “WARNINGS” CHAPTER AT THE BEGINNING
OF THIS MANUAL.
ATTENTION: once the gas train is mounted according to the diagram, the gas proving test mus be performed, according to
the procedure set by the laws in force.
12
34
MANUFACTURER INSTALLERINSTALLER

15
ELECTRICAL CONNECTIONS
To execute the electrical connections, proceed as follows:
find the pulg or the plugs, according to the model, that comes out from the burnrer:
7 pins plug for the power supply (for all models);
4 pins plug (double-stage burners);
Connectors identification
Respect the basic safety rules. make sure of the connection to the earthing system. do not reverse the phase and
neutral connections. fit a differential thermal magnet switch adequate for connection to the mains.
ATTENTION: before executing the electrical connections, pay attention to turn the plant’s switch to OFF and be
sure that the burner’s main switch is in 0 position (OFF) too. Read carefully the chapter “WARNINGS”, and the
“Electrical connections” section.
WARNING: if the cable that connects the thermostats and the control box should be longer than 3 meters, insert a
sectioning relay following the attached electrical wiring diagram.
Burner power supply connector HIGH/LOW flame connector
Single stage burner connector Double-stage burner connectors
7-pins connector 7-pins and 4-pins connectors
Key
C1 LOW FLAME TIME METER
C2 HIGH FLAME TIME METER
FU1 FAN MOTOR LINE FUSE
FU3 LINE FUSE
IL BURNER LINE SWITCH
IM FAN MOTOR LINE SWITCH
KM1 FAN MOTOR CONTACTOR
LAF BURNER IN HIGH FLAME INDICATOR LIGHT
LB INDICATOR LIGHT FOR BURNER LOCK-OUT
LBF BURNER IN LOW FLAME SIGNALLING LAMP
MV FAN MOTOR
ST THERMOSTATS O PRESSURE SWITCHES SERIE
TAB HIGH LOW FLAME THERMOSTAT/PRESSURE SWITCH
TS SAFETY THERMOSTAT/PRESSURE SWITCH
CONN-MOTORE FAN MOTOR CONNECTOR
CONN-LINEA BURNER POWER SUPPLY CONNNECTOR
CONN-TAB HIGH-LOW FLAME CONNECTOR
($) IF "TAB" USED REMOVE THE BRIDGE BETWEEN TERMINALS
T6-T8
WARNING: the burner is fitted with a bridge between terminals T6 and T8 on CN2-TAB connector (external side link,
male connector); remove this bridge before thermostat connection.

16
Power supply without neutral
If the burner power supply is 230V three-phase or 230V phase-phase (without a neutral), as fas as the Siemens LME2... control box,
the RC Siemens RC466890660 filter must be inserted between terminal 2 and the earth terminal on the board.
Key
C - Capacitor (22nF/250V)
LME - Siemens control box
R - Resistor (1Mohm)
RC466890660 - RC Siemens filter

17
ADJUSTING THE AIR AND GAS FLOW RATES
While performing the air and fuel adjustment, check the flow rate, measuring it on the counter or, if it is not possible, checking the com-
bustion head pressure by means of a differential pressure gauge as described on the next paragraph.
Combustion head pressure curves vs. the gas flow rate
Curves are referred to pressure= 0mbar in the combustion head!
The curves referred to the gas pressure in the combustion head, depending on the gas flow rate, are referred to the burner in the com-
bustion stage (percentage of residual O2 in the flues as shown in the “Recommended combustion values” table and CO in the stan-
dard limits). During this stage, the combustion head, the gas butterfly valve and the servocontrol are at the maximum opening. Refer to
Fig. 4, showing the correct way to measure the gas pressure, considering the values of pressure in combustion chamber, surveyed by
means of the pressure gauge or taken from the boiler’s Technical specifications.
Fig. 4
Key
1 Generator
2 Pressure outlet on the combustion chamber
3 Gas pressure outlet on the butterfly valve
4 Differential pressure gauge
Measuring the gas pressure in the combustion head
In order to measure the pressure in the combustion head, insert the pressure gauge probes: one into the generator’s pressure outlet
(Fig. 4-2) to get the pressure in the combustion chamber and the other one into the butterfly valve’s pressure outlet of the burner (Fig.
4-3). On the basis of the measured differential pressure, it is possible to get the maximum flow rate: in the pressure - rate curves (sho-
wed on the next paragraph), it is easy to get the burner output in kW or Stm3/h (quoted on the x axis) from the pressure measured in
the combustion head (quoted on the y axis).
NOTE: THE PRESSURE-RATE CURVES ARE APPROXIMATE; FOR A PROPER SETTING OF THE GAS RATE, PLEASE REFER
TO THE GAS METER READING.
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open and check that the pres-
sure upstream the gas train complies the value quoted on paragraph “Technical specifications”. Be sure that the
mains switch is closed.
ATTENTION: During commissioning operations, do not let the burner operate with insufficient air flow (danger of
formation of carbon monoxide); if this should happen, make the gas decrease slowly until the normal combustion
values are achieved.
WARNING: NEVER LOOSE THE SEALED SCREWS! OTHERWISE, THE DEVICE WARRANTY WILL BE IMMEDIA-
TELY INVALIDATE!
24
3
1

18
Plugs for pressure measurement
To measure the pressure in the combustion chamber, as far as the IDEA series, a pressure plug is provided upstream the burner’s
blast tube.
Pressure in combustion head - gas rate curves
Natural gas Burners
Single-stage models Double-stage models
The values in the diagrams refer to natural gas with a calorific value of 8125 kcal/Stm3 (15°C, 1013 mbar) and a density of
0.714 kg/Stm3 .
The values in the diagrams refer to GPL with a calorific value of 22300 kcal/Stm3 (15°C, 1013 mbar) and a density of 2.14 kg/
Stm3. When the calorific value and the density change, the pressure values should be adjusted accordingly.
Gas pressure in
combustion head
NG70 M-..
Gas rate Stm3/h
NGX70 M-..
Gas rate Stm3/h
Gas pressure in
combustion head
NG90 M-.
Gas rate Stm3/h
P
P
Where: Natural gas pressure shown in diagram
Real gas pressure
Natural gas flow rate shown in diagram
Real gas flow rate
Natural gas density shown in diagram
Real gas density
0
1
2
3
4
5
6
7
8
9
1,5 2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8
0
2
4
6
8
10
12
14
16
18
20
2345678
0
2
4
6
8
10
12
14
22,5 33,544,5 55,566,5 77,588,5 99,5

19
L.P.G. Burners
Adjusting the air and gas flow rates
To perform the adjustments, unscrew the fixing screws and remove the burner cover.
NOTE: the combustion analysis must be performed with the burner cover fitted!
Startup Output
The start-up heat output shall not exceed 120 kW (single stage burners) or 1/3 of nominal output (double-stage, progressive or fully
modulating burners). In order to comply with these requirements, burners are provided with butterfly valve and/or slow-opening safety
valve.
On double-stage, progressive or modulating burners, the low flame ouptut must be higher than the minimum ouptut quoted in the per-
formance curve (see “Measuring the gas pressure in the combustion head” on page 17).
Adjusting procedure
Check the phase and neutral position.
Check the proper earthening.
(Double-stage burners) Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and
the valves group pressure stabiliser respectively.
Gas pressure in
combustion head
LG70 L-.
Gas rate Stm3/h
LG90 L-.
Gas rate Stm3/h
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open and check that the pres-
sure upstream the gas train complies the value quoted on paragraph “Technical specifications”. Be sure that the
mains switch is closed.
ATTENTION: During commissioning operations, do not let the burner operate with insufficient air flow (danger of
formation of carbon monoxide); if this should happen, make the gas decrease slowly until the normal combustion
values are achieved.
WARNING: NEVER LOOSE THE SEALED SCREWS! OTHERWISE, THE DEVICE WARRANTY WILL BE IMMEDIA-
TELY INVALIDATE!
IMPORTANT! the combustion air excess must be adjusted according to the in the following chart:
Recommended combustion parameters
Fuel Recommended (%) CO2 Recommended (%) O2
Natural gas 9 ÷ 10 3 ÷ 4,8
LPG 11 ÷ 12 2,8 ÷ 4,3
0
1
2
3
4
5
6
7
0,5 1 1,5 2 2,5 3
0
2
4
6
8
10
0,5 1 1,5 2 2,5 3 3,5

20
Check that the combustion parameters are in the suggested limits.
Check the flow rate measuring it on the counter or, if it was not possible, verifying the combustion head pressure by means of a dif-
ferential pressure gauge, as described on par. “Measuring the gas pressure in the combustion head” on page 17.
(Double-stage burners) Set, now, the low flame output, acting on the low flame actuator microswitch in order to avoid the low flame
output increasing too much or that the flues temperature gets too low to cause condensation in the chimney.
Adjusting the combustion head
The burner is adjusted in the factory with the combustion head in the position that refers to the "MAX" output. The maximum output set-
ting refers to the “fully-ahead” position of the combustion head, as far as standard models (Fig. 6), and to “fully-backward” position for
low NOx burners (Fig. 7). As for “fully-ahead” position, it means that the head is placed inside the boiler, “fully-backward” position
means that the head is towards the operator. To remove the combsution head, please refer to par. “Removing and cleaning the combu-
stion head” on pag. 53. As far as the reduced output operation, progressively move the combusiton head towards the “MIN” position,
rotating clockwise the VRT screw (Fig. 5).
go on adjusting air and gas flow rates: check, continuosly, the flue gas analisys, as to avoid combustion with little air; dose the air
according to the gas flow rate change following the steps quoted below;
To change the burner setting during the testing in the plant, follows the next procedure.
Adjustements for single-stage burners
1 startup the burner by turning its main switch A to on: if the burner locks (LED B on in the control panel) press the RESET button (C)
on the control panel.
ATTENTION: if the ignition pahse fails, during the first start-up, increase the gas flow rate according to the precedure quoted below.
2 acting on the pressure stabiliser of the valves group, adjust the gas flow rate in the high flame stage as to meet the values
requested from the boiler/utilisation:
Pressure controller is provisionally factory-set. The setting values must be locally adapted to machine conditions.
Important: Follow the instructions of the burner manufacturer!
The compact DUNGS gas Multibloc is made of built-in filter, valves, governor and pressure switch.
Fig. 5 Fig. 6 - Head in “fully-ahead position” Fig. 7 - Head in “fully-backward po-
sition”
Fig. 8 -DUNGS MBC 65-DLE
Fig. 9
Keys
A. measuring noozle P2 (Fig. 9) before valve D
B. pressure regulator
C. startup valve (no. 10 in Fig. 9)
D. maximum flow rate valve(no. 9 in Fig. 9)
VRT
9
P
2
10
V2V11
P
1
P
3
12