Unigas IDEA Series, IDEA LG550, IDEA NG550, IDEA NGX550 Manual Of Installation - Use - Maintenance
IDEA Series
Gas burners
LG550
NG550
NGX550
MANUAL OF INSTALLATION - USE - MAINTENANCE
BURNERS - BRUCIATORI - BRULERS - BRENNER - QUEMADORES -
ГОРЕЛКИ
M039119CE Rel. 4.1 06/2010
TABLE OF CONTENTS
WARNINGS ............................................................................................................................................................... 5
PART I: INSTALLATION ........................................................................................................................................... 5
GENERAL FEATURES ................................................................................................................................................................... 5
How to interpret the burner “Performance curve” ........................................................................................................................... 6
Checking the proper gas train size ................................................................................................................................................ 6
BURNERS SPECIFICATIONS ....................................................................................................................................................... 7
Matching the burner to the boiler .................................................................................................................................................... 7
Specifications .................................................................................................................................................................................. 8
Country and usefulness gas categories .......................................................................................................................................... 9
Performance curves ...................................................................................................................................................................... 10
Overall dimensions ....................................................................................................................................................................... 12
MOUNTINGS AND CONNECTIONS ............................................................................................................................................ 14
Packing ......................................................................................................................................................................................... 14
Fitting the burner to the boiler ....................................................................................................................................................... 14
GAS TRAIN CONNECTIONS ....................................................................................................................................................... 15
Gas Proving System VPS504 (Option) ......................................................................................................................................... 16
ELECTRICAL CONNECTIONS .................................................................................................................................................... 17
Power supply without neutral ........................................................................................................................................................ 19
Combustion head pressure curves vs. the gas flow rate .............................................................................................................. 20
Measuring the gas pressure in the combustion head ................................................................................................................... 20
Plugs for pressure measurement .................................................................................................................................................. 20
Gas pressure in combustion head vs. gas flow rate curves .......................................................................................................... 21
Startup Output ............................................................................................................................................................................... 22
Adjustments - brief description ...................................................................................................................................................... 22
Adjustment procedure ................................................................................................................................................................... 22
Fully modulating burners ............................................................................................................................................................... 24
Calibration of air and gas pressure switches ................................................................................................................................ 24
Calibration of air pressure switch (only for single stage burners) ................................................................................................. 24
Calibration of air pressure switch (double-stage, progressive and fully-modulating) .................................................................... 24
Calibration of minimum gas pressure switch ................................................................................................................................ 25
Adjusting the high gas pressure switch (when provided) .............................................................................................................. 25
PART II: OPERATION ............................................................................................................................................. 26
Burner control panel ...................................................................................................................................................................... 27
OPERATION ................................................................................................................................................................................. 28
PART III: MAINTENANCE ....................................................................................................................................... 29
ROUTINE OPERATIONS ............................................................................................................................................................. 29
Removing the filter in the MULTIBLOC DUNGS MB-DLE 405..412 ............................................................................................ 29
Removing the filter in theMULTIBLOC DUNGS MB-DLE 415 - 420 ............................................................................................. 30
Removing and cleaning the combustion head .............................................................................................................................. 30
Replacing the electrodes .............................................................................................................................................................. 32
Electrodes position setting ............................................................................................................................................................ 32
Checking the ionisation current ..................................................................................................................................................... 33
Seasonal stop ............................................................................................................................................................................... 33
TROUBLESHOOTING .................................................................................................................................................................. 34
SPARE PARTS ............................................................................................................................................................................. 35
BURNER EXPLODED VIEW ........................................................................................................................................................ 36
ELECTRICAL WIRING DIAGRAMS ............................................................................................................................................. 38
APPENDIX
2
WARNINGS
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
z The equipment must be installed in compliance with the regulations
in force, following the manufacturer’s instructions, by qualified personnel.
z 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.
z Improper installation may cause injury to people and animals, or
damage to property, for which the manufacturer cannot be held liable.
z Remove all packaging material and inspect the equipment for inte-
grity.
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 children, as they may prove harmful.
z 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.
z Make sure that inlet or exhaust grilles are unobstructed.
z 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.
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.
z When a decision is made to discontinue the use of the equipment,
those parts likely to constitute sources of danger shall be made har-
mless.
z 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.
z For all the units that have been modified or have options fitted then
original accessory equipment only shall be used.
z This unit shall be employed exclusively for the use for which it is
meant. Any other use shall be considered as improper and, there-
fore, 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.
2) SPECIAL INSTRUCTIONS FOR BURNERS
z The burner should be installed in a suitable room, with ventilation
openings complying with the requirements of the regulations in force,
and sufficient for good combustion.
z Only burners designed according to the regulations in force should
be used.
z This burner should be employed exclusively for the use for which it
was designed.
z Before connecting the burner, make sure that the unit rating is the
same as delivery mains (electricity, gas oil,
z 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
or other fuel).
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
z Make sure that the burner has, on installation, been firmly secured to
the appliance, so that the flame is generated inside the appliance
firebox.
z 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
regulations 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 instruc-
tions is available in the boiler room.
z 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
Technical Service, without trying to RESET further.
z 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
z For safety reasons the unit must be efficiently earthed and installed
as required by current safety regulations.
z 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.
z 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.
z No adaptors, multiple outlet sockets and/or extension cables are per-
mitted to connect the unit to the electric mains.
z An omnipolar switch shall be provided for connection to mains, as
required by the current safety regulations.
z 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;
z The unit input cable shall not be replaced by the user.
In case of damage to the cable, switch off the unit and contact qualified
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
z The burner shall be installed by qualified personnel and in com-
pliance 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.
z 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.
z Before the burner is commissioned, qualified personnel should ins-
pect 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 desi-
gned 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.
z 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.
z Do not use gas pipes to earth electrical equipment.
z Never leave the burner connected when not in use. Always shut the
gas valve off.
z 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.
z 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:
- Directive 90/396/CEE - Gas Appliances;
- Directive 2006/95/EC on low voltage;
- Directive 2004/108/CEE on electromagnetic compatibility
Harmonised standards :
-UNI EN 676 (Gas Burners;
-CEI EN 60335-1(Household and similar electrical appliances - Safety.
Part 1: General requirements;
- EN 50165 (Electrical equipment of non-electric appliances for household and similar purposes. Safety requirements.
Light oil burners
European directives:
- Directive 2006/95/EC on low voltage;
-
Directive 2004/108/
Harmonised standards :
-CEI EN 60335-1(Household and similar electrical appliances - Safety.
Part 1: General requirements;
- EN 50165 (Electrical equipment of non-electric appliances for household and similar purposes. Safety requirements.
National standards :
-UNI 7824: Monobloc nebulizer burners for liquid fuels. Characteristics
and test methods
European directives:
- Directive 2006/95/EC on low voltage;
- Directive 2004/108/CEE on electromagnetic compatibility
Harmonised standards :
-CEI EN 60335-1 Household and similar electrical appliances - SafetyPart
1: General requirements;
- EN 50165 Electrical equipment of non-electric appliances for household
and similar purposes. Safety requirements.
National standards :
-UNI 7824: Monobloc nebulizer burners for liquid fuels. Characteristics
and test methods
European directives:
- Directive 90/396/CEE Gas Appliances;
- Directive 2006/95/EC on low voltage;
- Directive 2004/108/CEE on electromagnetic compatibility
Harmonised standards :
-UNI EN 676 Gas Burners
-CEI EN 60335-1(Household and similar electrical appliances - Safety.
Part 1: General requirements;
- EN 50165 Electrical equipment of non-electric appliances for household
and similar purposes. Safety requirements.
National standards :
-UNI 7824: Monobloc nebulizer burners for liquid fuels. Characteristics
and test methods
European directives:
- Directive 90/396/CEE - Gas Appliances;
- Directive 2006/95/EC on low voltage;
- Directive 2004/108/CEE on electromagnetic compatibility
Harmonised standards :
-UNI EN 676 (Gas Burners;
-CEI EN 60335-1(Household and similar electrical appliances - Safety.
Part 1: General requirements;
- EN 50165 Electrical equipment of non-electric appliances for household
and similar purposes. Safety requirements.
National standards :
-UNI 7824: Monobloc nebulizer burners for liquid fuels. Characteristics
and test methods
CEE on electromagnetic compatibility
Heavy oil burners
Gas - Light oil burners
Gas - Heavy oil burners
4
C.I.B. UNIGAS - M039119CE
PART I: INSTALLATION
1
3
4
2
6
5
7
10
11
8
14
13
9
15
12
GENERAL FEATURES
This series burners are characterised by high performaces and width in the performance curves, when the pressure in the combustion
chamber is high. They are also provided with other important functional features: there are plugs which can be easily connected to the
boiler and to the detecting probes, a pressure plug in the combustion chamber, all mechanical components are mounted on a plate
which can be quickly taken off for maintenance. The head is adjustable by means of a graduated screw. The gas train can be mounted
either on the right side or on the left side.
Fig. 1
1 Control panel with startup switch
2 Combustion head (inside)
3 Gas valves group
4 Gas proving system
5 Cover
6 Adjusting cam (double-stage, progressive and fully-modulating burners)
7 Actuator (double-stage, progressive and fully-modulating burners)
8 Control box
9 Air pressure switch
10 Fan motor
11 Burner plate
12 Air intake
13 Printed board circuit (PCB)
14 Flange
15 Blast tube
The gas coming from the supply line, passes through the valves group provided with filter and stabiliser. This one forces the pressure in
the utilisation limits. In the double-stage , progressive and fully- modulating burners, the electric actuator (7), that moves proportionally
the air damper and the gas butterfly valve, uses an adjusting cam with variable shape. This one allows the optimisation of the gas flue
values, as to get an efficient combustion. The combustion head (2) positioning determines the burner output. Fuel and comburent are
routed into separated ways as far as the zone of flame generation (combustion chamber). The air (comburent) and fuel (gas, gas oil,
heavy oil) are forced into the combustion chamber.
The control panel, placed on the burner’s front side, shows each operating stage.
5
C.I.B. UNIGAS - M039119CE
Tipo / Type P6 0
M-...50 (Multibloc DUNGS MB-DLE 420 B01)
M-...65 (Filtro / Filter DN65+ SIEMENS VGD40.065 +SKP1x+SKP2x)
0
5
10
15
20
25
100 200 300 400 500 600 700 800 900
Potenza / Output (kW)
Minima pressione gas in
rete / Minimum inlet gas
pressure (mbar)
Rp 2" (50)
DN65
How to interpret the burner “Performance curve”
To check if the burner is suitable for the boiler to which it must be installled, the following parameters are needed:
z furnace input, in kW or kcal/h (kW = kcal/h / 860);
z backpressure (data are available on the boiler ID plate or in the user’s manual).
Example:
Furnace input: 600kW
Backpressure: 4mbar
In the “Performance curve” diagram (Fig. 2), draw a vertical line matching the furnace input value and an horizontal line matching the
backpressure value. The burner is suitable if the intersection point A is inside the performance curve.
Camp o di l avoro bruci at o ri
Tipo P60 Mod. M-xx.x.IT.A.0.50 - M-.xx.x.IT.A.0.65
8
7
6
5
4
3
2
1
combustione mbar
0
Contropressione in camera di
-1
100 200 300 400 500 600 700 800 900
A
Pote nza kW
Fig. 2
Data are referred to standard conditions: atmospheric pressure at 1013mbar, ambient temperature at 15°C.
Checking the proper gas train size
To check the proper gas train size, it is necessary to know the available gas pressure value upstream the burner’s gas valve. Then
subtract the backpressure. The result is called pgas. Draw a vertical line matching the furnace input value (600kW, in the example),
quoted on the x-axis, as far as intercepitng the network pressure curve, according to the installed gas train (DN65, in the example).
From the interception point, draw an horizontal line as far as matching, on the y-axis, the value of pressure necessary to get the requested furnace input. This value must be lower or equal to the p
gas value, calculated before.
Fig. 3
6
C.I.B. UNIGAS - M039119CE
BURNERS SPECIFICATIONS
Burner model identification
Burners are identified by burner type and model. Burner model identification is described as follows.
Type NG550 Model M-. PR. S. .* A. 0. 50
(1) (2) (3) (4) (5) (6) (7) (8)
(1) BURNER TYPE
(2) FUEL
(3) OPERATION
(4) BLAST TUBE S - standard L - extended
(5) DESTINATION COUNTRY see data plate
(6) BURNER VERSION
(7) EQUIPMENT
(8) GAS CONNECTION 25 = Rp1 32 = Rp1”
NG - Natural gas burner
LG - L.P.G. burner
NGX - Low NOx burners
M - Natural gas
L - LPG
TN - Single stage AB - Double stage
PR - Progressive MD - Fully modulating
A - Standard
0 = 2 gas valves
1= 2 Gas valves + gas proving system (option)
7 = 2 gas valves + maximum gas pressure switch
8= 2 Gas valves + gas proving system (option) + maximum gas pressure switch
1/4 40 = Rp1”1/2 50 = Rp2
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 diameter 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 combustion
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 following:
z 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.
z 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 suitablyspacer to move the burner backwards or to design a blast tube tha suites the utilisation (please, contact the manifacturer).
Key
a) Heat output in kW
b) Lenght of the flame tube in meters
c) Flame tube firing intensity in MW/m
3
d) Combustion chamber diameter (m)
Fig. 4 - Firing intensity, diameter and lenght of the test flame tube as a function of the heat
input in kW.
Fig. 4
sized
7
Specifications
C.I.B. UNIGAS - M039119CE
BURNERS
Output min. - max kW
Fuel
NG550
M-.TN..0.25
NG550
M-.TN..0.32
NG550
M-.TN..0.40
NG550
M-.TN..0.50
LG550
L-.TN..0.25
245 - 570
Natural gas L.P.G.
Gas category (see next paragraph)
Gas rate
min.- max Stm
3
/h
26 - 60 9.4 - 22
Gas pressure min. - max. mbar (see Note 2)
Power supply
Total power consumption kW
Electric motor) kW
Protection
Approx. weight kg
Valves size / Gas connection
Operation
Operating temperature °C
Storage Temperature °C
Working service*
BURNERS
Output min. - max kW
Fuel
1”
/ Rp 1 1”
NG550
M-.xx..0.25
/Rp 1
1/4
NG550
M-.xx...0.32
1/41”1/2
NG550
M-.xx...0.40
/Rp 1
1/2
Natural gas L.P.G.
230V - 50Hz
2”/ Rp 2
Single stage
-10 ÷ +50
-20 ÷ +60
Internittent
NG550
M-.xx...0.50
160 - 570
0.92
0.62
IP40
55
1”
LG550
L-.xx..0.25
Gas category (see next paragraph)
Gas rate
min.- max Stm
3
/h
17 - 60 6.2 - 22
Gas pressure min. - max. mbar (see Note 2)
Power supply
Total power consumption kW
Electric motor kW
Protection
Approx. weight kg
Valves size / Gas connection
Operation
Operating temperature °C
Storage Temperature °C
Working service*
1”
/ Rp 1 1”
1/4
/Rp 1
/ Rp 1
1/41”1/2
1/2
Double stage - Progressive - Fully-modulating
230V - 50Hz
2” / Rp 2
-10 ÷ +50
-20 ÷ +60
Internittent
0.92
0.62
IP40
55
1”
/ Rp 1 1”
/ Rp 1 1”
LG550
L-.TN..0.32
/Rp 1
1/4
LG550
L-.xx...0.32
/ Rp 1
1/4
L-.TN..0.40
I
3B/P
1/41”1/2
L-.xx...0.40
I
3B/P
1/41”1/2
LG550
/Rp 1
LG550
/ Rp 1
LG550
L-.TN...0.50
2”/ Rp 2
1/2
LG550
L-.xx...0.50
2” / Rp 2
1/2
Note1:
All gas flow rates are referred to Stm
(nett calorific value H
= 34.02 MJ/Stm3); for L.P.G. (nett calorific value Hi = 93.5 MJ/Stm3)
i
3
/h (1013 mbar absolute pressure, 15 °C temperature) and are valid for G20 gas
Note2: Maximum gas pressure = 360mbar (with Dungs MBDLE valves)
Minimum gas pressure = see gas curves.
* NOTE ON THE WORKING SERVICE: the control box automatically stops after 24h of continuous working. The control box
immediately starts up, automatically.
8
Low NOx burners
C.I.B. UNIGAS - M039119CE
BURNERS
Output min. - max kW
Fuel
NGX550
M-.xx...0.25
NGX550
M-.xx...0.32
132 - 490
Natural gas
NGX550
M-.xx...0.40
NGX550
M-.xx...0.50
Gas category (see next paragraph)
Gas rate
min.- max Stm
3
/h
14 - 52
Gas pressure min. - max. mbar (see Note 2)
/ Rp 1
230V - 50Hz
0.92
0.62
IP40
55
1/4
1”
-10 ÷ +50
-20 ÷ +60
Internittent
1/2
/ Rp 1
1/2
2” / Rp 2
Power supply
Total power consumption kW
Electric motor kW
Protection
Approx. weight kg
Valves size / Gas connection
Operation
Operating temperature °C
Storage Temperature °C
Working service*
Note1:
All gas flow rates are referred to Stm
(nett calorific value H
= 34.02 MJ/Stm3); for L.P.G. (nett calorific value Hi = 93.5 MJ/Stm3)
i
1”
/ Rp 1 1”
1/4
Double stage - Progressive - Fully-modulating
3
/h (1013 mbar absolute pressure, 15 °C temperature) and are valid for G20 gas
Note2: Maximum gas pressure = 360mbar (with Dungs MBDLE valves)
Minimum gas pressure = see gas curves.
* 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
GAS
CATEGORY
I
2H
I
2E
I
2E( R ) B
I
2L
I
2ELL
I
2Er
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
LUPL-----------------------
BE------------------------
NL------------------------
DE------------------------
FR------------------------
COUNTRY
9
Performance curves
0
1
2
3
4
5
6
7
8
9
10
200 250 300 350 400 450 500 550 600 650
-1
0
1
2
3
4
5
6
7
8
9
100 150 200 250 300 350 400 450 500 550 600 650
0
1
2
3
4
5
6
7
8
9
100 200 300 400 500
C.I.B. UNIGAS - M039119CE
NG550 - LG550 Single stage
BACK PRESSURE IN
COMBUSTION CHAMBER mbar
NGX550 Low NOx burner
NG550 - LG550 Double-stage/Progressive
kW
kW
BACK PRESSURE IN
COMBUSTION CHAMBER mbar
kW
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.
NOTE: The performance curve is a diagram that represents the burner performance in the type approval phase or in the laboratory
tests, but does not represent the regulation range of the machine. On this diagram the maximum output point is usually reached by adjsuting the combustion head to its “MAX” position (see paragraph “Adjusting the combustion head”); the minimum output point is reached setting the combustion head to its “MIN” position. During the first ignition, the combustion head is set in order to find a
compromise between the burner output and the generator specifications, that is why the minimum output may be different from the Performance curve minimum.
10
Pressure in the network/gas rate curves
0
10
20
30
40
50
60
70
20 30 40 50 60 70
Rp 1"¼ (32)
Rp 1"½ (40)
R p 2" (50)
Rp 1" (25)
0
10
20
30
40
50
60
70
15 25 35 45 55 65 75
Rp 1"½ ( 40)
Rp 2" (50)
10
30
50
70
90
110
8 1012141618202224 26
Rp 1" (25)
2
6
10
14
18
22
26
30
8 101214161820222426
Rp 1"¼ (32)
)
Rp 2" (50)
0
20
40
60
80
100
6 8 10 12 14 16 18 20 22 24
Rp 1" (25)
0
5
10
15
20
25
30
5 1015202530
Rp 1"¼ (32)
Rp 2" (50)
Rp 1"½ (40)
0
10
20
30
40
50
60
10 20 30 40 50 60
Rp 1"¼ ( 32)
)
)
)
z Natural gas burners
NG550 Single stage
GAS PRESSURE mbar
C.I.B. UNIGAS - M039119CE
NG550 Double-stage/Progressive
Rp 1"
Rp 1"¼
L.P.G. Burners
z
LG550 L-TN..25 Single stage
GAS PRESSURE mbar
LG550 L-PR.. Double-stage/Progressive
Gas rate Stm3/h
Gas rate Stm3/h
Gas rate Stm3/h
LG550 L-TN..32/40/50 Single stage
Rp 1"½ (40
Gas rate Stm3/h
LG550 L-PR.. Double-stage/Progressive
GAS PRESSURE mbar
z
Low NOx burners
NGX550 Double-stage/Progressive
GAS PRESSURE mbar
Gas rate Stm3/h
Rp 1" (25
Rp 1"½ (40
Rp 2" (50
Gas rate Stm3/h
11
Gas rate Stm3/h
Overall dimensions (mm)
z Standard burners
12
C.I.B. UNIGAS - M039119CE
Recommended boiler drilling jig and burner flange
DN A(S*) A(L*) B(S*) B(L*) C
D
±5mm
E
±5mm
F G H J K L M N Omin Omax P Q R S T W X Y
NG/LG550 25/32 843 943 253 353 590 671 245 426 165 178 384 241 384 M10 247 157 192 174 552 377 175 69 543 533 155
NG/LG550 40 843 943 253 353 590 744 318 426 165 178 384 241 384 M10 247 157 192 174 552 377 175 69 553 533 155
NG/LG550 50 843 943 253 353 590 744 318 426 165 178 384 241 384 M10 247 157 192 174 552 377 175 69 603 533 155
* S = measure referred to burners fitted with standard blast tube
L = measure referred to burners fitted with extended blast tube
Low NOx BurnerLow NOx burners
C.I.B. UNIGAS - M039119CE
13
DN A(S*) A(L*) B(S*) B(L*) C
NGX550 25/32 874 974 253 353 590 671 245 426 176 198 384 241 384 M10 247 157 192 174 552 377 175 69 543 533 168
NGX550 40 874 974 253 353 590 744 318 426 176 198 384 241 384 M10 247 157 192 174 552 377 175 69 553 533 168
NGX550 50 874 974 253 353 590 744 318 426 176 198 384 241 384 M10 247 157 192 174 552 377 175 69 603 533 168
* S = measure referred to burners fitted with standard blast tube
L = measure referred to burners fitted with extended blast tube
D
±5mm
E
±5mm
Recommended boiler drilling jig and burner flangeRecommended boiler
drilling jig and burner flange
F G H J K L M N Omin Omax P Q R S T W X Y
C.I.B. UNIGAS - M039119CE
Keys
1 Burner
2 Fixing nut
3 Washer
4 Sealing gasket
5 Stud bolt
7Blast tube
SIDE UP
SIDE
DOWN
MOUNTINGS AND CONNECTIONS
Packing
urners are despatched in cardboard packages whose dimensions are: 1030mm x 530mm x 570mm (L x P x H)
Packing cases of this type are affected by humidity; the maximum number of cases to be stacked is showed 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 make a hole on the closing door of the combustion chamber as described on paragraph “Overall dimensions”)
2 place the burner to the boiler: lift it up and handle it according to the procedure described on paragraph “Handling the burner”;
3 place the 4 stud bolts (5) on boiler’s door, according to the burner’s drilling template described on paragraph “Overall dimensions”;
4 fasten the 4 stud bolts;
5 place the gasket on the burner flange;
6 install the burner into the boiler;
7 fix the burner to the stud bolts, by means of the fixing nuts, according to the next picture.
8 After fitting the burner to the boiler, ensure that the gap between the blast tube and the refractory lining is sealed with appropriate
insulating material (ceramic fibre cord or refractory cement).
The burner is designed to work positioned according to the picture below. For different installations, please contact the Technical
Department.
14
C.I.B. UNIGAS - M039119CE
1
2
3
4
5
78
9
4
MANUFACTURER INSTALLER
GAS TRAIN CONNECTIONS
This paragraph shows the gas train components which are included in the delivery and those which must be fitted by the customer. The
diagram complies with regulations in force
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.
Gas train with valves group MB-DLE (2 valves + gas filter + pressure governor) + VPS504 gas proving system
Key
1 Burner
2 Butterfly valve
3 Gas proving system (option)
4 Low gas pressure switch
5 High gas pressure switch (option)
7 Bellow joint
8 Manual cutoff valve
9 MB-DLE valve group
*Note: the high gas pressure switch can be mounted either upstream the gas valve or downstream the gas valves but upstream the but-
terfly gas valve.
To mount the gas train, proceed as follows:
1) in case of threaded joints: use proper seals according to the gas used;
2) fasten all the items by means of screws, according to the next diagrams, observing the mounting direction for each item.
NOTE: the bellow joint, the manual valve and the gaskets are not part of the standard supply.
The procedures of installation fo the gas valves are showed in the next paragraph.
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.
ATTENTION: it is recommended to mount filter and gas valves to avoid that extraneous material drops inside the valves,
during maintenance and cleaning operation of the filters (both the filters outside the valves group and the ones built-in the
gas valves).
MULTIBLOC DUNGS MB-DLE 405..412
Mounting
1. Mount flange onto tube lines: use appropriate sealing agent (see Fig. 7);
2. insert MB-DLE: note position of O rings (see Fig. 7);
3. tighten screws A, B, C and D (Fig. 5 - Fig. 6), accordind to the mounting positions (Fig. 8);
4. after installation, perform leakage and functional test;
5. disassembly in reverse order.
15
C.I.B. UNIGAS - M039119CE
A
B
DC
MOUNTING POSITIONS
A
B
C
D
C
B
D
A
MOUNTING POSITIONS
Fig. 5 Fig. 6 Fig. 7 Fig. 8
MULTIBLOC DUNGS MB-DLE 415..420
Mounting
1. Loosen screws A and B do not unscrew (Fig. 5 - Fig. 6).
2. unscrew screws C and D (Fig. 5 - Fig. 6).
3. Remove MultiBloc between the threaded flanges (Fig. 6).
4. After mounting, perform leakage and functional tests.
Fig. 9 Fig. 10 Fig. 11 Fig. 12
Once the train is installed, connect the gas valves group plug.
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.
Gas Proving System VPS504 (Option)
The VPS504 check the operation of the seal of the gas shut off valves. This check, carried out as soon as the boiler thermostat gives a
start signal to the burner, creates, by means of the diaphragm pump inside it, a pressure in the test space of 20 mbar higher than the
supply pressure.
To install the DUNGS VPS504 gas proving system on the MD-DLE valves group, proceed as follows:
1 turn off gas supply.;
2 Switch off power supply.
3 remove the Multibloc’s screw plugs (Fig. 13-A);
4 iInsert sealing rings (10,5 x 2,25) into VPS 504 (Fig. 14-B, Fig. 13-B)
5 Torque screws 3, 4, 5, 6 (M4 x16) Fig. 13-C
Only use screws with metric thread on reassembly (modification, repair).
6 On completion of work, perform a leak and functional test.
16
C.I.B. UNIGAS - M039119CE
A
B
LC
LB
PA
C
Fig. 13 Fig. 14
When wishing to monitor the test, install a pressure gauge ranged to that of the pressure supply point PA (Fig. 14). If the test cycle is
satisfactory, after a few seconds the consent light LC (yellow) comes on. In the opposite case the lockout light LB (red) comes on. To
restart it is necessary to reset the appliance by pressing the illuminated pushbutton LB.
17
C.I.B. UNIGAS - M039119CE
ELECTRICAL CONNECTIONS
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: 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.
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..
To execute the electrical connections, proceed as follows:
1 find the plug or the plugs, according to the model:
z 7 poles plug for the power supply (for all models);
z 4 poles plug (progressive burners);
z 3-poles plug;
2 execute the electrical connections to the plugs, according to the burner model (see next paragraph);
3 once all the connections are accomplished, check the fan motor direction (sse next paragraphs);
4 now the burner is ready to start up.
Identification of linking connectors
Burner supply connector
(Fig. 18, Fig. 20)
Probe connection connector
(fully modulating burners, Fig. 22)
HIGH/LOW flame connector
(progressive burners , Fig. 20
Fig. 15
Fig. 16
Fan motor connector
(Fig. 19 - Fig. 21)
Fig. 17
IMPORTANT: before operating the burner, be sure all connectors are linked as shown in the diagrams.
18
z
Single stage burner connectors:
- 7-poles connector Fig. 19 - Electric motor 3-pole connector
Fig. 18
z Progressive burner connectors
C.I.B. UNIGAS - M039119CE
Fig. 20 - 7-poles and 4-poles connectors Fig. 21 - Electric motor 3-poles connector
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
19
C.I.B. UNIGAS - M039119CE
R
C
SIEMENS
Key
C1 LOW FLAME TIME METER
FU1 LINE FUSE FOR FAN MOTOR
FU3 LINE FUSE
FU4 AUXILIARY FUSE
IL BURNER LINE SWITCH
IM FAN MOTOR LINE SWITCH
KM1 FAN MOTOR REMOTE CONTACTOR
SIEMENS RWF40 MODULATION REGULATOR
LB BURNER LOCKOUT SIGNALLING LAMP
LBF BURNER IN LOW FLAME SIGNALLING LAMP
MV FAN MOTOR
SD-0÷10V VOLTAGE SIGNAL
SD-0/4÷20mA CURENT SIGNAL
SD-PRESS PRESSURE PROBE
SMA MAN/AUTO SELECTOR
SMF OPERATION SELECTOR MIN-0-MAX
ST PRESSURE SWITCHES OR THERMOSTATS SERIE
TS SAFETY THERMOSTAT/PRESSURE SWITCH
Fig. 22 - Probes connection
Power supply without neutral
If the power supply to the burner is 230V phase-phase (without the neutral wire), with the Siemens LME.. control box (see Appendix),
between the terminal 2 on the board and the earth terminal, an RC Siemens RC466890660 filter must be inserted.
Key
C - Capacitor (22nF/250V)
R - Resistor (1Mohm)
(***) RC466890660 - RC Siemens filter
(Code: 2531003)
Fig. 23
20
C.I.B. UNIGAS - M039119CE
2
4
3
1
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 combustion stage (percentage of residual O
dard limits). During this stage, the combustion head, the gas butterfly valve and the servocontrol are at the maximum opening. Refer to
Fig. 24, 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.
in the flues as shown in the “Recommended combustion values” table and CO in the stan-
2
Fig. 24
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. 24-2) to get the pressure in the combustion chamber and the other one into the butterfly valve’s pressure outlet of the burner (Fig.
24-3). On the basis of the measured differential pressure, it is possible to get the maximum flow rate: in the pressure - rate curves
(showed 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.
Plugs for pressure measurement
To measure the pressure in the combustion chamber, as far as this series, a pressure plug is provided upstream the burner’s blast
tube.
Fan air pressure plug Pressure in combustion chamber plug
21
C.I.B. UNIGAS - M039119CE
0
1
2
3
4
5
6
7
8
9
10
15 20 25 30 35 40 45 50 55 60 65
0
1
2
3
4
5
6
7
8
9
10
11
12
10 15 20 25 30 35 40 45 50 55
5
5 7 9 111315171921 2325
3
4
1
5
2
Gas pressure in combustion head vs. gas flow rate curves
NG550
Gas pressure in
combustion head
LG550 L.P.G.
NGX550
Gas rate Stm3/h
Gas pressure in
combustion head
L.P.G. rate Stm3/h
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open and check that the pressure 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 INVALIDATE!
To perform the adjustments, unscrew the fixing screws and remove the burner cover.
Keys
1 Valve group
2 Cover
3 Gas proving system
4 Control panel
5 Blast tube
22
C.I.B. UNIGAS - M039119CE
I
II
III
IV
VS
IV
III
II
I
AUTO/MAN
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
performance curve (see “Gas pressure in combustion head vs. gas flow rate curves” on page 22).
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
Adjustments - brief description
Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam respectively.
z Check that the combustion parameters are in the suggested limits.
z 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 20.
z Then, adjust the combustion values corresponding to the points between maximum and minimum: set the shape of the adjusting
cam foil. The adjusting cam sets the air/gas ratio in those points, regulating the opening-closing of the throttle gas valve.
z .Set, now, the low flame output, acting on the low flame microswitch of the actuator in order to avoid the low flame output increa-
sing too much or that the flues temperature gets too low to cause condensation in the chimney.
Adjustment procedure
To change the burner setting during the testing in the plant, follows the next procedure, according to the burner operation.
Before starting the burner up, adjust the valves group slow opening: to set the slow opening remove cover T, reverse it upside down
and use it as a tool to twist screw VR. Decrease the ignition flow rate by screwing, increase it by unscrewing. Do not use a screwdriver
on the screw VR!
Note: the screw VSB must be removed only in case of replacemente of the coil.
1 remove the burner cover
2 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 ().
3 remove the actuator cover: set it to the ignition position (ignition position= 0° on the air damper index ID - see figure on pag.23);
4 (Progressive/Fully-modulating burners) Before starting the burner up, drive the high flame actuator microswitch matching the low
flame one (in order to let the burner operates at the lowest output) to safely achieve the high flame stage.
As for the setting, refer to this correspondence table.
Berger STA
Siemens SQN72
BERGER STA Siemens SQN72
High flame position (set to 90°) I
Low flame and ignition position IV
Stand-by position (set to 0°)
II
Not used III
z Berger STA12: On this actuator, the manual control of the air damper is not provided; the setting of the cams is carried out working
with a screwdriver on the VS screw placed on the cam.
z Siemens SQN72: a key is provided to move cams I and IV, the other cams can be moved by means of screws. On the Siemens
actuator the AUTO/MAN mode is provided (see picture).
23
I (red)
III (orange)
II (blue)
IV (black)
C.I.B. UNIGAS - M039119CE
C
VS
T(VR)
RP
VB
VSB
VR
ID
V
SC
SV
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;
6 drive the burner to high flame stage, by means of the thermostat TAB (except single-stage models).
7 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 by the boiler/utilisation:
- Multibloc MB-DLE:The pressure governor is adjusted by operating the screw VS
located under the cover C. By screwing down the pressure is increased and by
unscrewing it is reduced. The valve is adjusted by means of the RP regulator after
slackening the locking screw VB by a number of turns. By unscrewing the regulator
RP the valve opens, screwing the valve closes. The pressure stabilizer is adjusted by
operating the screw VS located under the cover C. By screwing down the pressure is
increased and by unscrewing it is reduced.
Pressure stabiliser is factory-set. The setting values must be locally adapted
to machine conditions. Important! Follow the instructions of the burner manufacturer!
To adjust the air flow rate, proceed as follows, according to the burner operation (singlestage, double-stage, prograssive or fully-modulating).
z Adjustements for single-stage burners
8 loosen VR screw (see picture below)
9
move the ID index towards + or -, in order to increase or decrease the air flow-rate, according to the required combustion values;
10 fasten the VR screw again.
Fig. 26 Fig. 27
z Double-stage, progressive or fully-modulating burners
11 still in the high flame operation and with the actuator on its 90° position, find the V screw on the adjusting cam SV (see next pic-
ture), matching with the bearings that move along the foil and related to the actuator position.
12 unscrew the V srew to increase the air folw rate, unscrew to decrease it
13 once the maximum flow rate is fixed, shortcircuit for a while, the thermostat TAB T6 and T7 terminals (see pag. 35), as far as the
fully-modulating burners, see next paragraph. The actuator will move towards the low flame position as to meet the next screw V;
then remove the bridge;
14 then adjust the screw V related to that position;
15 shortcircuit, again for a while, the TAB T6 and T7 terminals and repeat from point 11;
16 repeat all these instructions for all the actuator stroke, in order to define the foil shape.
Note: If it should be necessary to adjust the rating of the burner in low flame, work on the related actuator cam After this operation,
check the gas rate and verify the combustion values. In case of lack or excess of air, work on the screws V of the adjusting cam (see
pictures) matching the setting point of the air rate in low flame; unscrew to increase the air rate or screw to decrease it.
Fully modulating burners
To adjust the air rate in low flame and in the intermediate points, proceed as follow.
1 Keep pushed for 5 seconds the EXIT button on the modulator (); when the LED with the hand symbol lights up, press the arrow but-
2 stop its stroke when it meets each screw V: adjust the air rate by adjusting the V screw that matches each bearing.
3 Push the EXIT button to quit the manual mode.
ton, driving the actuator to the maximum opening position progressively;
24
C.I.B. UNIGAS - M039119CE
VRT
Fig. 28
ID
Adjusting the combustion head
The burner is factory-set with the combustion head at the position that refers to the "MAX" output. The maximum output setting refers to
the “fully-ahead” position of the combustion head, as far as standard models (Fig. 29), and to “fully-backward” position for low NOx burners (Fig. 30). As for “fully-ahead” position, it means that the head is towards the boiler, “fully-backward” position means that the head
is towards the operator. As far as the reduced output operation, progressively move the combusiton head towards the “MIN” position,
rotating clockwise the VRT screw (Fig. 28). The ID index shows how much the combustion head moved.
Fig. 29 - Head in “fully-ahead position”
Fig. 30 - Head in “fully-backward position”
Calibration of air and gas pressure switches
The air pressure switch locks the control box if the air pressure is not the one requested. If it happens, unlock the burner by means of
the control box unlock pushbutton, placed on the burner control panel. The gas pressure switches check the pressure to avoid the
burner operate when the pressure value is not in the requested pressure range.
Calibration of air pressure switch (only for single stage burners)
Calibration is carried out as follows:
z Remove the transparent plastic cap.
z Once air and gas setting have been accomplished, startup the burner.
z While the burner is operating, rotate slowly and clockwise the adjusting ring nut VR, until the burner locks; read the pressure value
on the scale of the pressure switch and set it again to a value reduced by the 15%.
z Repeat the start-up cycle and check the burner runs properly.
z Refit the transparent plastic cover on the pressure switch.
25
C.I.B. UNIGAS - M039119CE
VR
Calibration of air pressure switch (double-stage, progressive and fully-modulating)
To calibrate the air pressure switch, proceed as follows:
z Remove the transparent plastic cap.
z Once air and gas setting have been accomplished, startup the burner.
z During the pre-purge phase o the operation, turn slowly the adjusting ring nut VR in the clockwise direction until the burner lockout,
then read the value on the pressure switch scale and set it to a value reduced by 15%.
z Repeat the ignition cycle of the burner and check it runs properly.
z Refit the transparent plastic cover on the pressure switch.
Calibration of low gas pressure switch
As for the gas pressure switch calibration, proceed as follows:
z Be sure that the filter is clean.
z Remove the transparent plastic cap.
z While the burner is operating at the maximum output, test the gas pressure on the pressure port of the minimum gas pressure
switch.
z Slowly close the manual cutoff valve (placed upstream the pressure switch, see gas train installation diagram), until the detected
pressure is reduced by 50%. Pay attention that the CO value in the flue gas does not increase: if the CO values are higher than the
limits laid down by law, slowly open the cutoff valve as to get values lower than these limits.
z Check that the burner is operating correctly.
z Clockwise turn the pressure switch adjusting ring nut (as to increase the pressure value) until the burner stops.
z Slowly fully open the manual cutoff valve.
z Refit the transparent plastic cover on the pressure switch.
Calibration is carried out as follows:
z Remove the transparent plastic cap.
z With the burner in operation at the maximum power, test the pressure on the pressure port of the pressure switch;
z Slowly close the manual shut-off valve upstream the pressure switch (see gas train installation diagram) until the detected pressure
is reduced by 50%.
z Check that the burner works properly.T
z Then screw down the adjusting ring nut until the burner lockout.
z Fully open the manual shut-off valve
z Refit the transparent plastic cover on the pressure switch.
Adjusting the high gas pressure switch (when provided)
To calibrate the high pressure switch, proceed as follows according to its mounting position:
1 remove the pressure switch plastic cover;
2 if the maximum pressure switch is mounted upstreaam the gas valves: measure the gas pressure in the network, when flame is off;
by means of the adjusting ring nut VR, set the value read, increased by the 30%.
3 if the maximum pressure switch is mounted downstream the “gas governor-gas valves” group and upstream the butterfly valve:
light the burner, adjust it according to the procedure in the previous paragrph. Then, measure the gas pressure at the operating
flow rate, downstream the “gas governor-gas valves” group and upstream the butterfly valve; by means of the adjusting ring nut
VR, set the value read on step 2, increased by the 30%;
4 replace the plastic cover.
Fig. 31
26
C.I.B. UNIGAS - M039119CE
PART II: OPERATION
FG H
B
LID
C
A
LIMITATIONS OF USE
THE BURNER IS AN APPLIANCE DESIGNED AND CONSTRUCTED TO OPERATE ONLY AFTER BEING CORRECTLY CONNECTED TO A HEAT GENERATOR (E.G. BOILER, HOT AIR GENERATOR, FURNACE, ETC.), ANY OTHER USE IS TO BE CONSIDERED IMPROPER AND THEREFORE DANGEROUS.
THE USER MUST GUARANTEE THE CORRECT FITTING OF THE APPLIANCE, ENTRUSTING THE INSTALLATION OF IT TO
QUALIFIED PERSONNEL AND HAVING THE FIRST COMMISSIONING OF IT CARRIED OUT BY A SERVICE CENTRE AUTHORISED BY THE COMPANY MANUFACTURING THE BURNER.
A FUNDAMENTAL FACTOR IN THIS RESPECT IS THE ELECTRICAL CONNECTION TO THE GENERATOR’S CONTROL AND
SAFETY UNITS (CONTROL THERMOSTAT, SAFETY, ETC.) WHICH GUARANTEES CORRECT AND SAFE FUNCTIONING OF
THE BURNER.
THEREFORE, ANY OPERATION OF THE APPLIANCE MUST BE PREVENTED WHICH DEPARTS FROM THE INSTALLATION
OPERATIONS OR WHICH HAPPENS AFTER TOTAL OR PARTIAL TAMPERING WITH THESE (E.G. DISCONNECTION, EVEN
PARTIAL, OF THE ELECTRICAL LEADS, OPENING THE GENERATOR DOOR, DISMANTLING OF PART OF THE BURNER).
NEVER OPEN OR DISMANTLE ANY COMPONENT OF THE MACHINE.
OPERATE ONLY THE MAIN SWITCH, WHICH THROUGH ITS EASY ACCESSIBILITY AND RAPIDITY OF OPERATION ALSO
FUNCTIONS AS AN EMERGENCY SWITCH, AND ON THE RESET BUTTON.
IN CASE OF A BURNER SHUT-DOWN, RESET THE CONTROL BOX BY MEANS OF THE RESET PUSHBUTTON. IF A SECOND
SHUT-DOWN TAKES PLACE, CALL THE TECHNICAL SERVICE, WITHOUT TRYING TO RESET FURTHER.
WARNING: DURING NORMAL OPERATION THE PARTS OF THE BURNER NEAREST TO THE GENERATOR (COUPLING
FLANGE) CAN BECOME VERY HOT, AVOID TOUCHING THEM SO AS NOT TO GET BURNT.
Burner control panel
Single-stage and double-stage burners
Fig. 32 -
27
C.I.B. UNIGAS - M039119CE
P
Q
Fig. 33 - Progressive burners only
Keys
A Mains switch ON - OFF
B Lockout signalling lamp
C Reset button for control box
D Gas pressure switch consent signalling lamp
F High flame operation signalling lamp (or air damper opening during pre-purge stage)
G Low flame operation signalling lamp
H Ignition transformer in operation signalling light
I EV2 opening signalling lamp
L EV1 opening signalling lamp
P Modulator (on fully modulating burners only)
Q Operation selector MAN - AUTO (operation in manual or automatic mode):
MIN = operation with minimum output
0= Stop
MAX = operation at the maximum output
28
C.I.B. UNIGAS - M039119CE
VPS504
LC
LB
OPERATION
.BEFORE STARTING UP THE BURNER, BE SURE THAT THE MAIN SWITCH IS ON AND THE MANUAL SHUTOFF
VALVES ARE OPEN. READ CAREFULLY THE “WARNINGS” NOTES ON THIS MANUAL.
z Set to ON position the mains switch A on the burner electrical board front panel.
z Check the control box (see Appendix) is not in the lockout position (LED B on), if necessary reset it by means of the pushbutton C
(reset), pushing for less than 3 seconds (otherwise the control box will switch to the “Diagnostics” mode).
z Check that the control thermostats or pressure switches start the burner up.
z Check the gas supply pressure is sufficient (LED D on).
Only burners provided with gas proving system: the gas proving system check cycle starts; when the check is accomplished it is
signalled by the light of the LC LED on the device. When the valves check is finished, the start up cycle of the burner begins. In the
case of a leak in a valve, the gas proving system locks and its red LB LED lights.
To reset the device press its reset pushbutton (See “Gas Proving System VPS504 (Option)” on page 16.)
All burners
z When the startup cycle begins, the actuator drives the air damper to the maximum opening position, the fan motor starts and the
pre-purge phase begins.
z During the pre-purge phase, the complete opening of the air damper is signalled by the LED E on the frontal panel of the electrical
board.
z At the end of the pre-purge phase, the air damper goes to the ignition position, the ignition transformer comes on (signalled by the
LED H) and few seconds later the solenoid valves EV1 and EV2 are energized (LEDs L and I on the front panel).
z The flame must light up in the safety time (few seconds after the gas valve opening), totherwise the gas proving system locks out.
Few seconds after the opening of the valves, the ignition transformer and the lamp H turn off. The burner is now on.
z Some seconds after the gas valve opening, the burner starts the automatic operation: it drives to the high flame or low flame stage
according to the plant request (only for progressive burners - PR) or drives to the position reqired from the modulator (only fullt-
modulating burners - MD).
Single stage burners: the burner is on at the maximum power; the LEDs E and G are on;
z High-low flame burners: the burner is on in low flame (LED G is on); some seconds later the high flame operation begins and the
burner switches automatically to high flame (LED E is on) or remains in low flame operation, depending on the plant needs.
z Modulating burners: they are provided with the Siemens RWF40 modulator , placed on the burner side. As for the modulator ope-
rationm see the related manual.
29
C.I.B. UNIGAS - M039119CE
PART III: MAINTENANCE
➞
1
0
5
3
4
53
4
6
6
➞
2
3
4
5
At least once a year carry out the maintenance operations listed below. In the case of seasonal servicing, it is recommended to carry
out the maintenance at the end of each heating season; in the case of continuous operation the maintenance is carried out every 6
months.
WARNING: ALL OPERATIONS ON THE BURNER MUST BE CARRIED OUT WITH THE MAINS DISCONNECTED AND
THE FUEL MANAUL CUTOFF VALVES CLOSED!
ATTENTION: READ CAREFULLY THE “WARNINGS” CHAPTER AT THE BEGINNIG OF THIS MANUAL..
ROUTINE OPERATIONS
z Clean and check the gas filter cartdrige, if necessary replace it (Fig. 34 on).
z Remove, check and clean the combustion head (Fig. 40 on).
z Check the ignition and detection electrodes, clean and adjust if necessary (see Fig. 46). In case of doubr, check the detection cur-
rent according to the schemes in Fig. 47.
z Check and grease of sliding and rotating parts.
ATTENTION! When servicing, if it was necessary to disassemble the gas train parts, remember to execute the gas proving
test, once the gas train is reassembled, according to the procedure imposed by the law in force.
Removing the filter in the MULTIBLOC DUNGS MB-DLE 405..412
z Check the filter at least once a year!
z Change the filter if the pressure difference between pressure connection 1 and 3 (Fig. 34-Fig. 35)is Δp > 10 mbar.
z
Change the filter if the pressure difference between pressure connection 1 and 3 (Fig. 34-Fig. 35) is twice as high compared to the last
check.
You can change the filter without removing the fitting.
1 Interrupt the gas supply closing the on-off valve.
2 Remove screws 1 ÷ 4 using the Allen key n. 3 and remove filter cover 5 in
3 Remove the filter 6 and replace with a new one.
4 Replace filter cover 5 and tighten screws 1 ÷ 4 without using any force and fasten.
5 Perform leakage and functional test, p
= 360 mbar.
max.
6 Pay attention that dirt does not fall inside the valve.
Fig. 36
.
0
03
p
2
e
1
p
e
Fig. 35
p
a
p
Br
61
4
p
5
p
a
Br
Fig. 34
Fig. 36
30
C.I.B. UNIGAS - M039119CE
2
3
4
2
3
4
1
5
5
0
1
3
p
e
0
4
p
a
5
p
Br
03
p
e
4
p
a
61
5
p
Br
2
B
A
C
D
E
Removing the filter in theMULTIBLOC DUNGS MB-DLE 415 - 420 B01 1” 1/2 - 2”
z Check the filter at least once a year!
z Change the filter if the pressure difference between pressure connection 1 and 2 (
z
Change the filter if the pressure difference between pressure connection 1 and 2 (Fig. 37-Fig. 38) is twice as high compared to the last
check.
You can change the filter without removing the fitting.
1 Interrupt the gas supply closing the on-off valve.
2 Remove screws 1 ÷ 6 (
Fig. 39
).
3 Change filter insert.
4 Re-insert filter housing, screw in screws 1 ÷ 6 without using any force and fasten.
5 Perform leakage and functional test, p
= 360 mbar.
max.
6 Pay attention that dirt does not fall inside the valve.
Fig. 37-Fig. 38
) Δp> 10 mbar.
Fig. 38
Fig. 37
Fig. 39
Removing and cleaning the combustion head
1 Remove the 4 screws V1, V2, V3, V4 and the couple of screws S1 and S2 (Fig. 40).
ATTENTION: the screw V1 is longer than the other and must be replaced in its seat.
2 Slacken the butterfly valve adjusting rod (Fig. 41) and take it out pulling outside.
3 Remove the connector CR of the ionization electrode (Fig. 42).
4 Unplug cable CA of the ignition electrode EA (Fig. 42) and extract it from the flange by removing the rubber G (Fig. 42).
5 To remove the head, the operator must pull it towards himself.
6 Once the combustion head is removed, check that the air and gas holes are not obstructed.
7 Clean the combustion head by means of a vacuum cleaner or, in case of scale, scrape it off by means of a scratchbrush.
8 To reassemble the plate, follow the procedure in reversed order.
CAUTION: while assembling, before tightening screws V1, V2, V3, V4, tighten screws S1 and S2, then fasten V1, V2, V3, V4.To
remove the head, the operator must pull it towards himself. Once the combustione head is removed, check that the air and gas holes
are not obstructed
(Fig. 122 - H)
. Clean the combustion head by a compressed air blow or, in case of scale, scrape it off by a
31
scratchbrush.
V1
V3
V4
V2
S1
S2
LOCKED
UNLOCKED
H
H
G
CA
CR
CA
EA
CR
ABER
EA
V
C.I.B. UNIGAS - M039119CE
Fig. 40
Fig. 41 Fig. 42
Fig. 43 Fig. 44 Fig. 45
Replacing the electrodes
.To remove the electrodes, proceed as follows once the combustion head is removed (see “Removing and cleaning the combustion
head” on page 31):
1 disconnect the cables from the electrodes (ER = detection electrode; EA = ignition electrode);
2 loosen the fixing screw (V);
3 remove the electrodes and replace them, observing the measures quoted on next paragraph;
4 re-connect the cables and re-assemble the combustion head (see next picture).
32
C.I.B. UNIGAS - M039119CE
Detection electrode
ignition electrode
Ground electrode
detection electrode
NG550
NGX550
Connector
µA DC SCALE
2
Detection electrode
Flame
Control box Minimum detection signal
Siemens LME21-22 3 µA
Electrodes position setting
ATTENTION: avoid the ignition and detection electrodes to contact metallic parts (blast tube, head, etc.), otherwise the boiler’s operation would be compromised. Check the electrodes position after any intervention on the combustion head. The gap between the ignition
electrode and the ground is 4 ÷ 5 mm (see Fig. 46).
Fig. 46
Checking the ionisation current
If the burner locks out, execute the following inpesctions. To measure the detection signals refer to the diagrams in Fig. 47 . If the signal
is less than the value shown, check the position of the detection electrode, the electrical contacts and if necessary replace the detection
electrode (see “Electrodes position setting” on page 33).
Fig. 47
Seasonal stop
To stop the burner in the seasonal stop, proceed as follows:
1 turn the burner main switch to 0 (Off position)
2 disconnect the power mains
3 close the fuel valve of the supply line
Burner disposal
In case of disposal, follow the instructions according to the laws in force in your country about the “Disposal of materials”.
33
TROUBLESHOOTING
CAUSE
THE BURNER
DOESN’TSTART
MAIN SWITCH OPEN
LACK OF GAS
MAXIMUM GAS PRESSURE SWITCH DEFECTIVE (IF
PROVIDED)
THERMOSTATS/PRESSURE SWITCHES DEFECTIVE
OVERLOAD TRIPPED INTERVENTION
AUXILIARIES FUSE INTERRUPTED
CONTROL BOX FAULTY
DEFECTIVE SERVOCONTROL (IF PROVIDED)
AIR PRESSURE SWITCH FAULT OR BAD SETTING
34
MINIMUM GAS PRESSURE SWITCH DEFECTIVE OR GAS
FILTER DIRTY
IGNITION TRANSFORMER FAULT
IGNITION ELECTRODES BAD POSITION
DETECTION ELECTRODE BAD POSITION
BUTTERFLY VALVE BAD SETTING
DEFECTIVE GAS GOVERNOR
GAS VALVE DEFECTIVE
BAD CONNECTION OR DEFECTIVE HIGH/LOW FLAME
THERMOSTAT OR PRESSURE SWITCH (IF PROVIDED)
WRONG SETTING SERVO CONTROL CAM
UV PROBE DIRTY OR DEFECTIVE (IF PROVIDED)
PHASE-NEUTRAL INVERTED
PHASE-PHASE SUPPLY OR PRESENCE OF VOLTAGE ON
THE NEUTRAL CONDUCTOR(*)
z
zz
zz
zz z
z
z
zz z z z
zz z
zzzz
zzzz z
l = with any control box;
s = with only LGB2../LMG2../LME11/LME2..
(*) In such cases, insert the circuit SIEMENS “RC466890660” ()See chapter “Electrical connections”)
CONTINUE WITH PRE-
PURGE
z
z
zz
zzz z
z
DOESN’T START AND
ll l
LOCK-OUT
DOESN’T START AND
REPEATS THE CYCLE
STARTS AND REPEATS
THE CYCLE
TROUBLE
STARTS AND LOCK-OUTВ
THE FLAME MONITOR
DEVICE DOESN’T
GIVECONSENT TO START
DOESEN’T SWITCH TO
HIGH FLAME
DOESEN’T RETURN IN
LOW FLAME
HE SERVO CONTROL IS
LOCK AND VIBRATE
LOCK-OUT DURING
OPERATION
TURNS OF AND REPEATS
CYCLE DURING
OPERATION
C.I.B. UNIGAS - M039119CE
zz
zz
lll
s
s
C.I.B. UNIGAS - M039119CE
SPARE PARTS
Desription Code
NG550 LG550 NGX550
COVER 1011801 1011801 1011801
CONTROL BOX 2020468 2020468 2020468
DETECTION ELECTRODE 2080108 2080108 2080108
INGNITION ELECTRODE 2080218 2080218 2080270
INGNITION ELECTRODE 2080234 2080234 GASKET 2110056 2110056 2110056
FAN WHEEL 2150049 2150049 2150049
GAS PRESSURE SWITCH 2160077 2160077 2160077
AIR PRESSURE SWITCH 2160053 2160053 2160053
IGNITION TRANSFORMER MOD. COFI 2170138 2170138 2170138
IGNITION TRANSFORMER MOD. DANFOSS 2170233 2170233 2170233
MOTOR 2180711 2180711 2180711
VALVE GROUP Rp1 2190341 2190341 2190341
VALVE GROUP Rp1 1/4 2190342 2190342 2190342
VALVE GROUP Rp1 1/2 21903L3 21903L3 21903L3
VALVE GROUP Rp2 21903L4 21903L4 21903L4
GAS PROVING SYSTEM (option) 2191604 2191604 2191604
ADJUSTING CAM FOIL 2440236 2440236 2440236
ACTUATOR (double stage, progressive and fully-modulating) - Berger
STA13
ACTUATOR (double stage, progressive and fully-modulating) - Sie-
mens SQN72
COMBUSTION HEAD 30600F2 30600F9 30600G0
BLAST TUBE (*S) 30900F4 30900F4 30910K7
BLAST TUBE (*L) 30900H9 30900H9 30910K6
COMBUSTION HEAD WITH ELECTRODES (standard blast tube) 3501835 3501834 3501838
COMBUSTION HEAD WITH ELECTRODES (extended blast tube) 3501835 3501834 3501839
INGNITION CABLE 6050153 6050153 6050153
DETECTION CABLE 6050214 6050214 6050214
ELECTRONIC BOARD 6100541 6100541 6100541
2480074 2480074 2480074
24800A4 24800A4 24800A4
*S:standard blast tube
L: extended blast tube
35
BURNER EXPLODED VIEW
POSITION DESCRIPTION POSITION DESCRIPTION
1 EXTENDED BLAST TUBE 23 CONTROL BOX
2 GENERATOR GASKET 24 IGNITION TRANSFORMER
3 THREADED GAS PIPE 25 ACTUATOR
4 FLANGE 26 AIR PRESSURE SWITCH
5 FLANGE 27 OUTPUT CONTROLLER
6 GAS PROVING SYSTEM 28 PRINTED CIRCUIT BOARD
7 COVER FIXING SCREW 29 FRONT CONTROL PANEL
8 AIR INTAKE 30 FRONT CONTROL PANEL
9 AIR INTAKE 31 LIGHT
10 PRESSURE PLUG 32 LIGHT
11 BRACKET 33 CONTACTOR
12 COVER 34 LOCK-OUT RESET BUTTON
13 FAIRLEAD 35 PROTECTION
14 FAIRLEAD 36 SWITCH
36
15 FAIRLEAD 37 FUSE
16 FLANGED PIPE 38 GAS MANIFOLD
17 BURNER HOUSING 39 EXTENDED COMBUSTION HEAD (ASSY)
18 MOTOR SUPPORT PLATE 40 IGNITION CABLE
19 FAN WHEEL 41 DETECTION CABLE
20 MOTOR 42 CONNECTOR
21 TRANSMISSION 43 CONNECTOR
22 GAS MANIFOLD 44 GAS VALVES GROUP WITH GOVERNOR
C.I.B. UNIGAS - M039119CE
37
C.I.B. UNIGAS - M039119CE
C.I.B. UNIGAS - M039119CE
ELECTRICAL WIRING DIAGRAMS
Wiring diagram 18-163 - Complete key
C1 LOW FLAME TIME METER
C2 HIGH FLAME TIME METER
ER FLAME DETECTION ELECTRODE
EV1,2 GAS ELECTRO-VALVES (OR VALVES GROUP)
FU1 FAN MOTOR LINE FUSE
FU2 LINE FUSE
FU3 LINE FUSE
FU4 AUXILIARY FUSE
IL BURNER LINE SWITCH
IM FAN MOTOR LINE SWITCH
KM1 FAN MOTOR CONTACTOR
LAF BURNER IN HIGH FLAME INDICATOR LIGHT
LME2x330 CONTROL BOX
LME22.330 CONTROL BOX
LB INDICATOR LIGHT FOR BURNER LOCK-OUT
LBF BURNER IN LOW FLAME INDICATOR LIGHT
LEV1 INDICATOR LIGHT FOR OPENING OF ELECTRO-VALVE EV2
LEV2 INDICATOR LIGHT FOR OPENING OF ELECTRO-VALVE EV2
LF INDICATOR LIGHT BRUNER FUNCTIONING
LPG INDICATOR LIGHT FOR PRESENCE OF GAS IN THE NETWORK
LTA IGNITION TRANSFORMER INDICATOR LIGHT
MV FAN MOTOR
PA COMBUSTION AIR PRESSURE SWITCH
PG MINIMUM GAS PRESSURE SWITCH
PS LOCK-OUT RESET BUTTON
PT100 TEMPERATURE PROBE
PT1000 TEMPERATURE PROBE
RC RC CIRCUIT
SATRONIC DLG976 CONTROL BOX
SATRONIC DMG972 CONTROL BOX
SD-0÷10V VOLTAGE SIGNAL
SD-0/4÷20mA CURRENT SIGNAL
SD-PRESS PRESSURE PROBE
SD-TEMP TEMPERATURE PROBE
SIEMENS RWF40 MODULATOR
SMA MANUAL/AUTOMATIC SELECTOR
SMF MIN-0-MAX FUNCTIONING MANUAL SELECTOR
ST SERIES OF THERMOSTATS OR PRESSURE SWITCHES
STA13B0.36/83N23L AIR DAMPER SERVO CONTROL
TA IGNITION TRANSFORMER
TAB ($) HIGH-LOW THERMOSTAT/PRESSURE SWITCHES
TC THERMOCOUPLE
TS SAFETY THERMOSTAT OR PRESSURE SWITCH
VPS504 GAS PROVING SYSTEM (OPTIONAL)
(*) CN11 LGB21.330 - SINGLE STAGE VERSION ONLY
(**) PROBE CONNECTION (SEE SHEET 4)
(***) WITH ELECTRIC SUPPLY WITHOUT NEUTRAL VERSION ONLY
($) IF "TAB" USED REMOVE THE BRIDGE BETWEEN TERMINALS T6-T8
ACTUATOR CAMS BERGER STA13B0.36/83N23L
I High flame
II Stand-by
IV Low flame
III Not used
WARNING:
1 - Electrical supply 230V 50/60Hz 1N a.c.
2 - Do not reverse phase with neutral
3 - Ensure burner is properly earthed
38
SIEMENS LME11/21/22 CONTROL BOX
APPENDIX
LED
Y
...
.....................................
zzzzzz
......................................
S S S S S
z S z S z S z S z S
S S S S
The series of equipment LME.. is used for the starup and supervisione of
1- or 2- stage gas burners. The series LME.. is interchangeable with the
series LGB.. and LMG.., all diagrams and accessories are interchangeable.
Comparative table
LGB Series LMG Series LME Series
--- LMG 25.33 LME 11.33
LGB 21.33 LMG 21.33 LME 21.33
LGB 22.33 LMG 22.33 LME 22.33
Preconditions for burner startup
z Burner control must be reset
z All contacts in the line are closed, request for heat
z No undervoltage
z Air pressure switch LP must be in its “no-load” position
z Fan motor or AGK25 is closed
z Flame detector is darkened and there is no extraneous light
Undervoltage
Safety shutdown from the operating position takes place should mains
voltage drop below about AC 175 V (at UN = AC 230 V)
Restart is initiated when mains voltage exceeds about AC 185 V (at UN =
AC 230 V).
Controlled intermittent operation
After no more than 24 hours of continuous operation, the burner control
will initiate automatic controlled shutdown followed by a restart.
Reversed polarity protection with ionization
If the connections of live conductor (terminal 12) and neutral conductor
(terminal 2) aremixed up, the burner control will initiate lockout at the end
of the safety time “TSA”.
Control sequence in the event of fault
If lockout occurs, the outputs for the fuel valves, the burner motor and the
ignition equipment will immediately be deactivated (< 1 second).
Operational status indication
In normal operation, the different operating states are showed by means
of the multicolor LED, inside the lockout reset button:
red LED
Steady on
yellow LED
green LED
Off
During startup, status indication takes place according to the table:
Status Color code Color
Waiting time tw, other
waiting states
Ignition phase, ignition
controlled
Off
Flashing yellow
START-UP PROGRAM
As far as the startup program, see its time diagram:
A Start command (switching on)
This command is triggered by control thermostat / pressure controller
«R». Terminal 12 receives voltage and the programming mechanism
starts running. On completion of waiting time «tw» with the LME21..., or
after air damper «SA» has reached the nominal load position (on completion of «t11») with the LME22..., fan motor «M» will be started.
tw Waiting time
During the waiting time, air pressure monitor «LP» and flame relay «FR»
are tested for correct contact positions.
t11 Programmed opening time for actuator «SA»
(Only with LME22...) The air damper opens until the nominal load position
is reached. Only then will fan motor «M» be switched on.
t10 Specified time for air pressure signal
On completion of this period of time, the set air pressure must have built
up, or else lockout will occur.
t1 Prepurge time
Purging the combustion chamber and the secondary heating surfaces:
required with low-fire air volumes when using the LME21... and with nomi-
nal load air volumes when using the LME22.... The diagrams show the so-
called prepurge time «t1» during which air pressure monitor «LP» must
indicate that the required air pressure is available. The effective prepurge
time «t1» comprises interval end «tw» through «t3».
t12 Programmed closing time for actuator «SA»
(Only with LME22...)During «t12», the air damper travels to the low-fire
position.
t3 Preignition time
During «t3» and up to the end of «TSA», flame relay «FR» is forced to
close. On completion of «t3», the release of fuel is triggered at terminal 4.
TSA Ignition safety time
On completion of «TSA», a flame signal must be present at terminal 1.
That flame signal must be continuously available until shutdown occurs,
or else flame relay «FR» will be deenergized, resulting in lockout.
t4 Interval BV1 and BV2-LR
Time between the end of TSA and the signal to the second fuel valve BV2
or to the load controller LR
B - B' Interval for flame establishment
C Burner operation position
C - D
Burner operation (heat production)
Controlled by "R" shutdown
D
The burner stops and the control device is ready for a new startup.
Operation, flame ok Green
Operation, flame not
ok
Extraneous light on
burner startup
Undervoltage Yellow - red
Fault, alarm Red
Error code output
(refer to “Error code
table”)
Flashing green
Green - red
Flashing red
LME11 control sequence
SB / R
W / GP
AL
M
LP
BV1
Z
FS
tw
t1
t3n
TSA
t4
7
t10
EK2
12
10
3
7
4
6
1
8
t3
A
B
B´
C
D
11
SB / R
W / GP
AL
LP
SA
BV1
Z
FS
tw
t1
t3n
TSA
t4
7101d02/0606
t11
t12
EK2
12
10
3
7
4
5
6
1
8
A
B
B´ C
D
9
t3
t10
LK
M
I
11
SB / R
W / GP
AL
LP
BV1
(LR) BV2
Z
FS
tw
t1
t3n
t4
7101d05/0206
12
10
3
7
4
5
6
1
A
B
B´ C
D
t3
t10
M
11
LME22 control sequence
LME21 control sequence
Control sequence
tw Waiting time
t1 Purge time
TSA Ignition safety time
t3 Preignition time
t3n Postignition time
t4 Interval between BV1 and BV2/LR
t10 Specified time for air pressure signal
t11 Programmed opening time for actuator SA
t12 Programmed closing time for actuator SA
LME11 connection diagram
NT
P
C control
RESET
EK
FSV
ION
1
2
3
M
4
BV1
5
7
Z
10
AL
T
12
R / W
GP
STB
9
p
a
6
LP
8
EK
11
K1
K2/1
K3
K2/2
H
Si
L
N
NT
RESET
EK
FSV
ION
1
2
3
M
4
BV1
5
BV2
7
Z
10
AL
T
12
R / W
GP
STB
9
p
a
6
LP
8
EK
11
K1
K2/1
K3
K4
K2/2
H
Si
L
N
P
C control
NT
P
C control
RESET
EK
FSV
ION
1
2
3
M
4
BV1
5
BV2
7
Z
10
AL
T
12
R / W
GP
STB
9
p
a
6
LP
8
EK
11
K1
K2/1
K3
K4
K2/2
H
Si
SA
L
N
QRC
br
bl
sw
12
12
Nur LME23...
LME21 connection diagram
Connection diagram
AL Error message (alarm)
BV Fuel valve
EK2 Remote lockout reset button
FS Flame signal
GP Gas pressure switch
LP Air pressure switch
LR Load controller
M Fan motor
R Control thermostat/pressurestat
SB Safety limit thermostat
W Limit thermostat /pressure switch
Z Ignition transformer
LME22 connection diagram
CONTROL PROGRAM IN THE EVENT OF FAULT
z If a fault occurs, all outputs will immediately be deactivated (in less
than 1s).
z After an interruption of power, a restart will be made with the full pro-
gram sequence.
z If the operating voltage drops below the undervoltage thresold, a
safety shutdown is performed.
z If the operating voltage exceeds the undervoltage thresold, a restart
will be performed.
z In case of extraneous light during “t1”, a lockout occurs.
z In case of extraneous light during “tw”, there is a prevention of startup
and a lockout after 30 seconds.
z In case of no flame at the end of TSA, there will be max. 3 repetitions
of the startup cycle, followed by a lockout at the end of TSA, for mod.
LME11..; directly a lockout at the end of TSA for LME21-22 models.
z For LME11 model: if a loss of flame occurs during operation, in case of
an establishment of flame at the end of TSA, there will be max. 3 repetitions, otherwise a lockout will occur.
z For LME21-22 models: if a loss of flame occurs during operation, there
will be a lockout.
z If the contact of air pressure monitor LP is in working position, a prevention of startup and lockout after 65 seconds will occur.
z IIf the contact of air pressure monitor LP is in normal position, a
lockout occurs at the end of t10.
z If no air pressure signal is present after completion of t1, a lockout will
occur.
ERROR CODE TABLE
2 blinks **
No establishment of flame at the end of TSA
- Faulty or soiled fuel valves
- Faulty or soiled flame detector
- Inadequate adjustement of burner, no fuel
- Faulty ignition equipment
The air pressure switch does not switch or remains in idle position:
3 blinks ***
- LP is faulty
- Loss of air pressure signal after t10
LPis welded in normal position.
-
4 blinks **** - Extraneous light when burner starts up.
5 blinks *****
- LP is working position.
6 blinks ***** Free.
7 blinks ******* Loss of flame during operation
- Faulty or soiled fuel valves
- Faulty or soiled flame detector
- Inadequate adjustement of burner
8 ÷ 9 blinks Free
10 blinks ********** Faulty output contacts
Attention: “lockout” remote signal (terminal no. 10) not enabled
- Wiring error
- Anomalous voltage on ouput terminals
- Other faults
14 blinks ************** (only for LME4x) - CPI contact (gas valve microswitch) not closed.
CONTROL BOX LOCKED
In the event of lockout, the LME.. remains locked and the red signal lamp
(LED) will light up.The burner control can immediately be reset. This state
is also mantained in the case fo mains failure.
DIAGNOSITICS OF THE CASUE OF FAULT
z Press the lockout reset button for more than 3 seconds to activate the
visual diagnostics.
z Count the number of blinks of the red signsl lamp and check the fault
condition on the “Error code table” (the device repeats the blinks for
regular intervals).
During diagnostics, the control outputs are deactivated:
- the burner remains shut down;
- external fault indication is deactivated;
- fault status is showed by the red LED, inside the LME’s lockout reset
buttonaccording to the “Error code table”:
RESETTING THE BURNER CONTROL
When lockout occurs, the burner control can immediately be reset, by
pressing the lockout reset button for about 1..3 seconds. The LME.. can
only be reset when all contacts in the line are closed and when there is no
undervoltage.
LIMITATION OF REPETITIONS (only for LME11.. model)
If no flame is established at the end of TSA, or if the flame is lost during
operation, a maximum of 3 repetitions per controller startup can be performed via “R”, otherwise lockout will be initiated. Counting of repetitions is
restarted each time a controlled startup via “R” takes place.
Condensation, formation of ice and ingress of water are not
permitted!
TECHNICAL CHARACTERISTICS
Mains voltage 120V AC +10% / -15%
230V AC +10% / -15%
Frequency 50 ... 60 Hz +/- 6%
Power consumption 12VA
External primary fuse max. 10 A (slow)
input current at terminal 12 max. 5 A
Detection cable length max. 3m (for electrode)
Detection cable length max. 20 m (laid separately, for QRA probe)
Reset cable length max. 20 m (posato separatamente)
Term. 8 & 10 cable length max. 20 m
Thermostat cable length max. 3 m
and other terminals
Safety class I
Index of protection IP40 (to be ensured during mounting)
Operating conditions -20... +60 °C, < 95% UR
Storage conditions -20... +60 °C, < 95% UR
Weight approx. 160 g
Note: Specifications and and data subject to change. Errors and omissions excepted.
C.I.B. UNIGAS S.p.A.
Via L.Galvani, 9 - 35011 Campodarsego (PD) - ITALY
Tel. +39 049 9200944 - Fax +39 049 9200945/9201269
web site: www.cibunigas.it - e-mail: cibunigas@cibunigas.it
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