Installation & Maintenance Manual
MG3 - LN
Gas Burner
11/12
Tel: +44 (0) 1905 794331 Fax: +44 (0) 1905 794017 Email: info@nu-way.co.uk Web: www.nu-way.co.uk
Contents
General information ....................................................................................................... 3
Checking scope of delivery and connection data .......................................................... 3
Maintenance and customer service ............................................................................... 3
Operating instructions.................................................................................................... 3
Instruction of operating personnel ................................................................................. 3
Key for code designation ............................................................................................... 4
Technical specifications..................................................................................................4
Boiler connection dimensions .........................................................................................4
Installing the gas jacket on the boiler..............................................................................5
Mounting the burner housing on the gas jacket (service position) .................................5
Electrical connections .....................................................................................................5
Air flap positioning motor .............................................................................................. 7
Air pressure monitor .......................................................................................................7
Gas pressure monitor .....................................................................................................7
Control box LFL 1.322/02 ..............................................................................................8
Calculation principles for gas burner adjustment............................................................9
Compact gas unit KE ..................................................................................................10
Two-stage continuous or modulating gas burner with compact unit
KEV II 1 ½", KEV 2" and KEV 2 ½" (gas/pressure proportional pressure regulator) ....11
17 b Two-stage continuous or modulating gas burner with compact unit
KEV 2 ½" to Ø150 (gas/pressure proportional pressure regulator)...............................12
18 Leak check device (accessory) ....................................................................................13
19 Start-up .........................................................................................................................13
20 Troubleshooting ............................................................................................................14
21 Adjustment tables ........................................................................................................15
22 Wiring diagram MG3-Z-L-N ..........................................................................................16
23 Wiring diagram MG3-Z-L-N with star-delta-connection ................................................17
24 Wiring diagram MG3-M-L-N .........................................................................................18
25 Wiring diagram MG3-M-L-N with star-delta-connection................................................18
26 Connection plan MG3-Z-L-N.........................................................................................20
27 Connection plan MG3-M-L-N........................................................................................20
28 Working ranges.............................................................................................................22
29 Overall dimensions ......................................................................................................22
30 Declaration of conformity ..............................................................................................22
E. 24.01.00 • G.19.03.03
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
17 a
2
1. General information
The installation of a gas-fired system must conform to extensive regulations and requirements. It is therefore the duty of the installer to be familiar with all applicable regulations and requirements. Installation,
start-up and maintenance must be performed with utmost care.
The burner must not be operated in rooms with high levels of air humidity (laundry rooms), dust or corrosive
vapours. The boiler room must be ventilated accordingly with ventilation air.
The GIERSCH MG3-LN series gas burners are suitable for burning natural gas and comply with the European standard DIN EN 676.
2. Checking scope of delivery and connection data
Before installing the GIERSCH gas burner, please check that all items included in the scope of delivery are
present.
Scope of delivery:
Burner, gas jacket and gas-jacket gasket, 4 retaining screws, separate operating instructions, technical information, one 7 - pin and one 4 - pin connector (Wieland connectors).
Compact gas unit
Gas installation and start-up are subject to the applicable technical regulations [e.g. DVGW
(DVGW-TRGI)].
The gas pipe must be designed to conform to the flow rate and the available gas flow pressure and routed
with the lowest pressure loss over the shortest distance to the burner.
The loss of gas pressure via the compact unit and the burner and the resistance on the fuel gas side of the
heat generator must be less than the connection flow pressure.
Caution !!
Observe sequence and throughflow direction of valves and fittings.
3. Maintenance and customer service
The complete system should be checked once a year for correct functioning and leaks by a representative
of the manufacturer or other suitably qualified person.
We accept no liability for consequential damage in cases of incorrect installation or repair, the fitting of nongenuine parts or where the equipment has been used for purposes for which it was not intended.
4. Operating instructions
The operating instructions together with this technical information leaflet must be displayed in a clearly visible position in the boiler room. It is important that the address of the nearest customer service centre is
written on the back page of the Operating Instructions.
5. Instruction of operating personnel
E. 24.01.00 • G.19.03.03
Faults are often caused by operator error. The operative personnel must be properly instructed in the
function of the burner. In the event of recurring faults, Customer Service should be notified.
3
6. Key for code designation
MG 3.1-Z(M)-L-LN-N
Erdgas
LL+E
Natural gas
LL + E
LowNox
Air shut-off flap
Luftabschlußklappe
Two-stage
Zweistufig (modulating)
gleitend (Modulierend)
Typ Mischeinrichtung
Brennertyp
Size
Brennerserie
Series
7. Technical specifications
Burner type
Technical data
MG3.1-LN
MG3.2-LN
MG3.3-LN
Min. burner output in kW
420
450
700
Max. burner output in kW
1193
1550
2000
Gas type
Natural gas LL+E
Method of operation
2-stage, modulating
Voltage
230 / 400 V - 50 Hz
Max. current consumption
20 A
Electric motor power
(at 2800rpm) in kW
3.0
4.0
Flame failure controller
4.5
UV monitor
Control box
LFL1.322
Air pressure monitor
LGW 50
Weight in kg approx.
110
115
120
Noise emission in dB (A)
80
82
84
8. Boiler connection dimensions
All dimensions in mm
12
M
E. 24.01.00 • G.19.03.03
Ø260
Ø328
4
9. Installing the gas jacket on the boiler
Air-pressure
connector
The boiler connection plate has to be prepared in accordance with the sizes as stated in Section
8. "Boiler connection dimensions".
You can use the gas-jacket gasket as a template.
Using an 8 mm socket-head wrench, secure the gas
jacket to the boiler with the 4 M 12 securing screws
and washers.
KEV compact unit: screw in the air-pressure connector
at the top.
Use adhesive to affix the gas-jacket gasket to the gas
jacket.
10. Mounting the burner housing on the gas jacket (service position)
Position the burner housing in the gas-jacket hinge
and secure it with a rod. The burner is now in the service position.
Connect ignition cable "A" to the ignition transformer.
Make sure that the gasket is correctly seated
between gas jacket and burner housing.
Swing the burner closed and insert the second securing rod into the hinge. Tighten the screw at the top to
secure the burner in position.
11. Electrical connection
Caution !
Always set the main switch to "Off" and remove the
fuse before connecting the cables or removing electrical components .
The burner must be connected to the electricity supply
in accordance with the wiring diagram. This wok must
be performed by trained, qualified electricians. The
supply cable to the burner must be of the flexible type.
E. 24.01.00 • G.19.03.03
See "22-25, Wiring diagram" on Page 16-19.
The cover has to be removed and set to the service
position in order to permit access to the control gear.
Remove the 4 securing screws in the sides and engage the cover in the long thread above the flange fasteners for the burner motor.
The adhesive film (B) can be cut to permit installation
of a service hour meter for stage
1 and stage 2.
5
Once the connection to the electricity supply has been
established, check the wiring and briefly actuate the
motor contactor with an electrician’s insulated
screwdriver to check the direction of rotation of the
burner motor.
The direction of rotation is correct if the fan turns toward the boiler (see the arrow on the motor flange).
Important:
The motor protective relay is set ex-works to 7.5 A (at
MG3.1), 5,5 A (at MG3.2 - MG3.3 star-delta-connection). As part of the pre-startup check, make sure that
this setting is correct.
MG3.1 alternatively with star-delta-connection.
MG3.2-MG3.3 always with star-delta-connection.
A
A
E. 24.01.00 • G.19.03.03
Note:
The mounting plate can be removed once the four sokket-head screws (A) have been removed with a No. 4
Allen key.
The cables for the external burner connections (power
cable, control and safety thermostats) can be inserted
though the cable glands behind the mounting plate
and wired to the terminals trip.
Make sure that the outer sheaths of the cables are
stripped back at least as far as the rear edge of the
mounting plate.
6
12. Air flap positioning motor
See 21. Adjustment tables on Page 15.
The air-valve positioning motor serves to adjust the air
flaps on burners with air modulation. Adjustment is via
limit switch cams on the positioning drive roller.
The cam positions for adjusting the burner to the required boiler output are given on the Initial Adjustment Table.
To do so:
Remove cover from air flap positioning motor. Change
cam positions with aid of adjusting key. The adjusting
key is located on the side of the air flap positioning motor.
If necessary, switching cams can be adjusted when
setting the burner.
Higher number = increase air
Lower number = reduce air
Adjustments of ST1 and ST2 only take effect after brief changeover 1st/2nd stage.
Adjust cam ST1 no greater than ST2
When adjustment of the burner is complete, refit positioning motor cover and set switch on cover to position
for stage 2.
13. Air pressure monitor
The air pressure monitor is a differential pressure monitor and monitors pressure at the blower burner.
The air pressure monitor is set ex-works to 8 mbar.
14. Gas pressure monitor
E. 24.01.00 • G.19.03.03
The gas pressure monitor serves to monitor the gas inlet pressure. The burner is shut down if the gas inlet
pressure drops below the set minimum value (preset at factory to 12 mbar). The burner starts up automatically when the preset minimum pressure is exceeded.
7
15. Control box LFL 1.322/02
If a fault of any nature whatsoever develops, the fuel
supply is immediately cut off. The program comes to a
halt at the same time, which means that the indicator
also stops. The symbol in line with the "read here"
mark on the indicator shows the nature of the fault.
1
P
2
No start, for example because terminal 8 does not have the CLOSED signal from the reverser limit
switch on the "ST0" positioning drive or because a contact is not closed between terminals 12 and 4
or 4 and 5.
Start-up aborted, because terminal 8 does not have the OPEN signal from the reverser limit switch
on the "St2" positioning drive. Terminals 6, 7 and 14 remain live until the fault has been rectified.
Shutdown on fault, because no air pressure indicated when air pressure monitoring starts. Any subsequent drop in air pressure also results in a shutdown on fault.
Shutdown on fault due to a defect in the lame monitoring circuit.
Start-up aborted, because terminal 8 does not have the position signal from the auxiliary switch on
the "St1" positioning drive for the small-flame position. Terminals 6, 7 and 14 remain live until the fault
has been rectified.
Shutdown on fault, because no flame signal registered when the safety time expires. Any subsequent
failure of the flame signal after the safety time has expired also results in a shutdown on fault.
Shutdown on fault, because the flame signal fails during burner operation or because of low air pressure.
Shutdown on fault when the control program is in progress on account of spurious light (e. g. flame
not extinguished, leaking fuel valves) or on account of a defective flame signal (e. g. UV tube too old,
defect in flame monitoring circuit, etc.).
main switch
savety thermostat
gas pressure contr.
motor / apc
ignition transformer
MV stage 1
SQN
max
min
closed
E. 24.01.00 • G.19.03.03
MV stage 2
ionisation
8
16. Calculation principles for gas burner adjustment
The values given in the tables are setting values for start-up.
The necessary system adjustment must be newly determined in each case.
General:
The calorofic value (Hi,n) of fuel gasses is usually given for normal atmospheric conditions
(0°C, 1013 mbar).
Natural gas type E
Hi,n = 10.4 kWh/m3
Natural gas type LL
Hi,n = 9.3 kWh/m3
Gas counters measure the volume of gas in the operational state.
Specifying throughput:
To allow correct setting of the heat generator load, the gas throughput must be determined in advance.
Example:
Height above sea level
Atmospheric pressure B (according to table)
Gas pressure PG at counter
Gas temperature ϑG
Boiler rating Qn
Efficiency ηK (assumed)
Calorific value Hi,n
230 m
989 mbar
20 mbar
16°C
100 kW
92%
10.4 kWh/m3
Gas flow in standard state (Vn)
3
Qn
100kW
m
-------------------------------------------------------------Vn =
=
= 10, 5
ηk × H
kWh
h
i, n
0, 92 × 10, 4 ----------m3
Gas flow in operating state (V B)
m3
-----10
5
,
3
Vn
hm
---------------------=
VB =
= 11, 2 -----f
0, 94
h
Conversion factor (f)
B+P
273
f = --------------G × -------------------1013 273 + ϑG
Annual average air pressure
Mean geodesic height of
supplied region ASL [m]
E. 24.01.00 • G.19.03.03
Annual average of
air pressure
Key:
Qn =
ηK =
Hi,n =
f=
B=
pG =
ϑG =
from
1
51
101
151
201
251
301
351
401
451
501
551
601
651
701
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
(mbar) 1016 1013 1007 1001 995
989
983
977
971
965
959
953
947
942
936
930
to
0
boiler rating [kW]
efficiency [%]
lower standard calorific value [kWh/m3]
conversion factor
barometric pressure [mbar]
gas pressure at gas counter [mbar]
gas temperature at gas counter [°C]
9
17. Compact gas unit KE
The compact gas units for GIERSCH gas burners are preassembled, depending on the scope of supply,
and checked for leaks. The compact unit (KE) can be connected directly to the gas pipe.
Checking for leaks and venting
The gas supply system must be installed, checked for leaks and vented by the power utility in accordance
with all applicable regulations.
Threaded adapters, flanged connections and connecting lines must be checked for leaks with approved
leak-testing apparatus.
When venting lines, discharge the gas safely to atmosphere with a hose.
Exclude all possible sources of ignition, e. g. do not smoke, do not throw switches in electrical gear, and
keep all other sources of heat and flame well clear.
"AIR" connection
Air control line
E. 24.01.00 • G.19.03.03
Air-pressure connector
10
17 a. Two-stage continuous or modulating gas burner with compact unit
KEV II1 ½", KEV 2" and KEV 2 ½" (gas/air proportional pressure regulator)
Installation of compact unit
Installation position
only in horizontal line, not tilted
Minimum distance to walling:
20 mm
Screw in each measuring nipple for combustion-chamber pressure at the top of the gas jacket
(see "9. Installing gas jacket" on boiler).
Route the connecting hose between the measuring nipple for combustion-chamber pressure and the compact unit in a loose
loop.
Gas pressure monitor
Measuring point A
Cover plate
SKP10
SKP70
Measuring point B
Gas filter
•
•
•
•
•
•
•
•
VGD20
Connect the air control line (blue) between the "AIR" connector on the compact unit and the air-pressure connector on the gas jacket (see illustration on Page 10).
Remove the cover plate from the gas/pressure proportional pressure controller.
Adjust the combustion air for stage 2 or max. load and for stage 1 or min. load at the air valve positioning motor in accordance with the table.
Pre-adjust the gas/air proportional pressure regulator SKP 70 by turning the "high flame" adjusting
screw and adjust the "low flame" setting until the mark on the scale is at "0" (see "21. Adjustments
table" for initial adjustment).
Start the burner and set it to approx. 90% of required burner output.
Turn the "high flame" adjusting screw to optimise the settings in accordance with the flue-gas emission values.
After adjusting, switch the burner from stage 2 to stage 1.
Check the flue-gas emission values and correct the operating characteristic if necessary by turning
the "low flame" adjusting screw.
Direction of adjustment
„+“ = to increase the gas flow rate
„-“ = to reduce the gas flow rate
Recheck the values at low load and high load and correct the settings if necessary.
If the inlet pressures are higher than 20 mbar, set the gas pressure monitor to approx. 70-80% of the
inlet pressure.
E. 24.01.00 • G.19.03.03
•
•
11
17 b. Two-stage continuous or modulating gas burner with compact unit
KEV 2 ½" to Ø150 (gas/air proportional pressure regulator)
Installation of compact unit
Installation position
only in horizontal line, not tilted
Minimum distance to walling:
20 mm
Screw in each measuring nipple for combustion-chamber pressure at the top of the gas jacket
(see "9. Installing gas jacket" on boiler).
Route the connecting hose between the measuring nipple for combustion-chamber pressure and the compact unit in a loose
loop.
SKP10
SKP70
Gas pressure monitor
VGD40
•
•
•
•
•
•
•
•
Connect the air control line (blue) between the "AIR" connector on the compact unit and the air-pressure connector on the gas jacket (see illustration on Page 10).
Remove the cover plate from the gas/pressure proportional pressure controller.
Adjust the combustion air for stage 2 or max. load and for stage 1 or min. load at the air valve positioning motor in accordance with the table.
Pre-adjust the gas/air proportional pressure regulator SKP 70 by turning the "high flame" adjusting
screw and adjust the "low flame" setting until the mark on the scale is at "0" (see "21. Adjustments
table" for initial adjustment).
Start the burner and set it to approx. 90% of required burner output.
Turn the "high flame" adjusting screw to optimise the settings in accordance with the flue-gas emission values.
After adjusting, switch the burner from stage 2 to stage 1.
Check the flue-gas emission values and correct the operating characteristic if necessary by turning
the "low flame" adjusting screw.
Direction of adjustment
„+“ = to increase the gas flow rate
„-“ = to reduce the gas flow rate
•
Recheck the values at low load and high load and correct the settings if necessary.
E. 24.01.00 • G.19.03.03
If the inlet pressures are higher than 20 mbar, set the gas pressure monitor to approx. 70-80% of the inlet
pressure.
12
18. Leak check device (accessory)
The leak check device is an automatic valve monitor. Both the gas solenoid valves in the gas line are chekked for leaks. Following a controlled shutdown of the burner and before restart of the purging time, the gas
pressure in the test section between the two gas solenoid valves is increased. The contacts for the control
box are enabled if the test time expires and the test section is leaktight. The leak check device is checked
for leaks before each start.
If there is a leak (pressure in the test section drops), the leak check device goes into fault mode and blocks
the signal enabling the contacts for the control box.
19. Start-up
The burner can be put into operation once the gas and electrical installation and assembly work has been
completed.
Briefly actuate the motor contactor with an electrician's insulated screwdriver to check the direction of
rotation of the burner motor. (See section on electrical connection)
•
Prepare the flue-gas analyser.
•
Adjust the air valve positioning motor (positioning drive SQN) as described in Section 12. The MV 2
setting is not necessary in the case of proportional pressure control.
•
Prepare the compact unit as described in Section 17a/17b.
•
Switch on the burner.
•
Once the burner has started, set the switch on the cover to stage 2.
•
Adjust the gas pressure to suit the requisite burner output, see Section 16.
•
Check the flue-gas emission values ( CO2, CO, O2) and adjust the combustion air accordingly. The
CO2 content of the flue gas should be 9-10% for natural gas.
•
Once stage 2 has been adjusted correctly, set the switch on the cover to stage 1. Adjust the gas pressure and gas flow rate to suit the on-site conditions.
Check the flue-gas emission values and adjust the combustion air accordingly.
•
After adjusting, switch the burner from stage 1 to stage 2.
•
After completion of adjustment, check the setting data.
•
Check the gas pressure monitor after start-up.
To do so, close ball valve slowly; burner must shut down but not go into fault mode.
E. 24.01.00 • G.19.03.03
•
13
20. Troubleshooting
Defect determined
Start-up is cancelled
Burner starts up and after expiry
of the safety period switches
to fault
Flame extinguishes during
operation
Remedy
No voltage
Fuse has tripped
Power contactor defective
Motor protecting relay has tripped
Check electricity supply
Replace
Replace
Set motor protecting relay, check
electricity supply
Motor faulty
Replace
Safety thermostat locked
Unlock
Temperature of controller setting is
Renewed start attempt after temperaexceeded
ture drop
Control box faulty
Replace
Secondary light detected by UV photo- Flame not extinguished,
electric cell
check valves
No gas
Open gas shut-off valve, safety shutoff in supply line, if applicable, check
gas infeed pressure
Gas pressure too low
Gas pressure is correct
Gas valve leaking,
Repair leak,
Leak monitor goes to fault status
reset leak monitor
Contacts on gas-pressure monitor or
Check contacts or replace monitor
air-pressure monitor not closed or
defective
No OPEN signal at Air valve posiCheck limit switches in air flap positioning motor
tioning motor, check connections of
positioning motor
Air-pressure monitor incorrectly set or Adjust trip point
defective
or replace air-pressure monitor
Pulse line to pressure monitor clogged Clean
Blower impeller clogged
Clean
Motor direction of rotation is incorrect Reverse motor connections
No ignition
Check ignition electrodes and settings,
Ignition electrodes dirty
insulation of electrodes damaged,
ground connection
Ignition cable broken or scorched
Flame sensor dirty or not correctly
adjusted
No gas to burner,
gas filter clogged
Gas solenoid valve does not open
Air in gas line
Gas nozzle dirty or faulty
UV tube too old or defective
Clean
Replace electrodes and re-adjust
Gas pressure too low or dropping
Clean gas filter, replace compact unit
Fluctuations in gas pressure
Notify gas-supply utility company
Replace
Clean and re-adjust
Replace filter
Replace
Vent
Clean or replace
Replace
Valves fail to open correctly
Flame pulsates and extinguishes
Check valves
Check gas pressure and gas flow
rate, check air setting
Flame does not hold, mixer unit set Adjust mixer unit and clean, regulate
incorrectly or dirty, too much excess air burner, if necessaryinstall draught
or draught
regulator
UV tube too old or defective
Replace
E. 24.01.00 • G.19.03.03
Burner motor does not start up
Cause
14
21. Adjustment tables
The values given in the tables are only setting values for start-up. The system settings required
in each case must be redefined if values such as boiler output, calorific value and altitude deviate.
A correction is required in any case.
MG3.1-LN
Burner output
Stage 2 Stage 1
Boiler output
where
ηk = 90%
Stage 2
Nozzle pressure
Stage 2 Stage 1
kW
kW
678
420
610
6.7
927
465
834
11.8
1066
533
959
15
1141
570
1026
17.5
1168
584
1051
18.1
1193
597
1073
18.8
MG3.2-LN
Burner output
Stage 2 Stage 1
kW
Natural gas LL H i,n= 9,3 [kWh/m3]
Boiler output
where
ηk = 90%
Stage 2
mbar
mbar
Gas flow rate
Stage 2 Stage 1
Natural gas E H i,n= 10,4 [kWh/m3]
Nozzle pressure
Stage 2 Stage 1
Air flap
Cam setting
m3/h
m3/h
1.9
77.9
47.8
2.8
106.6
53
4.3
122.7
60.7
11.5
3.4
4.8
131.3
65
13.4
3.7
5
134.1
66.5
13.9
3.9
126
63
23
110
5.3
137.2
68
14.5
4
128.7
64.4
24
140
Natural gas LL H i,n= 9,3 [kWh/m3]
Nozzle pressure
Stage 2 Stage 1
Gas flow rate
Stage 2 Stage 1
mbar
Gas flow rate
Stage 2 Stage 1
mbar
m3/h
m3/h
5.2
1.5
73.1
45.3
10
30
9.1
2.3
100
50
14
50
115
57.5
20
70
123
61.5
22
90
Natural gas E H i,n= 10,4 [kWh/m3]
Nozzle pressure
Stage 2 Stage 1
Gas flow rate
Stage 2 Stage 1
ST1
ST2
Air flap
Cam setting
kW
kW
kW
mbar
mbar
m3/h
m3/h
mbar
mbar
m3/h
m3/h
ST1
ST2
988
450
889
7.4
1.7
114.4
51.9
5.7
1.3
106.6
48.5
1
30
1247
623
1122
11.9
3.5
144.4
71
9.2
2.7
134.5
66.5
10
50
1389
694
1250
15
4.3
160.6
79
11.5
3.3
149.8
74
14
70
1463
731
1316
16.7
4.7
169
83.3
12.8
3.6
157.8
78
16
90
1511
755
1360
17.9
4.9
174.5
86
13.8
3.7
163
80.6
18
110
1550
775
1395
19
5.2
178.8
88.3
14.6
4
167.2
82.7
19
140
MG3.3-LN
Burner output
Stage 2 Stage 1
Boiler output
where
ηk = 90%
Stage 2
Natural gas LL H i,n= 9,3 [kWh/m3]
Nozzle pressure
Stage 2 Stage 1
Gas flow rate
Stage 2 Stage 1
Natural gas E H i,n= 10,4 [kWh/m3]
Nozzle pressure
Stage 2 Stage 1
Gas flow rate
Stage 2 Stage 1
Air flap
Cam setting
kW
kW
kW
mbar
mbar
m3/h
m3/h
mbar
mbar
m3/h
m3/h
ST1
ST2
1272
717
1170
8.3
3.7
145.5
82.1
7
3.3
130.1
73.4
19
40
1435
717
1320
10.6
3.7
164.1
82.1
8.8
3.3
146.8
73.4
19
52
1685
870
1550
13.7
4.6
192.7
99.5
11.3
4.0
172.3
88.9
25
66
1022
1670
16.2
6.0
207.6
116.9
13.3
5.2
185.7
104.5
30
72
1022
1840
21.7
6.0
228.7
116.9
17.6
5.2
204.6
104.5
30
130
E. 24.01.00 • G.19.03.03
1815
2000
15
F2
M1
L1
T1
U1
L2
T2
V1
L3
T3
W1 3
1
Y9
See 27. connection plan A
M
3
2
X3
X3
1
2
N
T8
T7
T6
B5
X1 1
B4
S3
T2
T1
N
PE
L1
T8
T7
T6
B5
X1 2
B4
S3
T2
T1
N
PE
L1
2
PE
A1
A2
X9
N
L1
L2
L3
12
N
L1 L2 L3
96
95
4
11
6
16
5
2 8
3 7
11
N
see 26. Connection plan B S
4
1
9
12
3
10
6
8
5
5
4
2
3
6
1
2
7
N
1
3
4
F4
2
10
6
11
4
1
3
5
8
7
3
p
1
2
F1
Q1
S1
br
10 9
8
1
7
N 19
31 20
32
9
6
2
5
11 5
4
21 8
6
N 2 3
bl
3
5
1
6
4
5
7
4
6
10
9
1
2
8
sw
X8 4
1
31 18
9
bl
14 13 12
22
3
br
23
bl
16 32
br
16
2
Y4
5 8
1
7
13 6
N 11
2
10
A1
3 4 9
N
T8
T7
L1 T6
B5
X4
N
T8
T7
L1 T6
B5
X4
2
5
+
1
4
7
6
0000
0000
h
h
3-10
B3
T1
S5
F2
F4
H11
H12
H13
H2
Switch panel
Ionisation monitor
Fuses, 16AT external,
on account of high motor current
Motor circuit-breaker
Air-pressure monitor
Pilot lamp, stage 1
Pilot lamp, stage 2
Lamp, fault indicator
Pilot lamp
E. 24.01.00 • G.19.03.03
K1
M1
P11
P12
Q1
S1
S2
S3
S4
S5
Motor contactor
Burner motor
Service hour meter, stage 1 (optional)
Service hour meter, stage 2 (optional)
Main switch, motor supply line, ext.
Control box L&G LFL 1.322
ON / OFF switch
Reset switch
Remote enable (optional)
Switch, stages 1 - 2
3
10
1 2
2
3-10
P12 H12 P1 1 H11 H1 3
(Option)
A1
B3
F1
9
H2
(Option)
T1 Ignition transformer
X11, X31 Male adapter, boiler control
X12,X32,X42 Female adapter, burner
X41 Male adapter, gas section
X8 Single-pole terminal strip
X9 Terminal strip
Y4 Positioning drive, L&G SQN 30.111
Y9 External gas solenoid valve
(connection option)
S2
S3
8
22. Wiring diagram MG3-Z-L-N-LN
K1
E. 24.01.00 • G.19.03.03
see 26. Connection plan B
17
A1
B3
F1
F2
F4
H11
H12
H13
H2
Switch panel
Ionisation monitor
Fuses, 16AT external,
on account of high motor current
Motor circuit-breaker
Air-pressure monitor
Pilot lamp, stage 1
Pilot lamp, stage 2
Lamp, fault indicator
Pilot lamp
KM1
KM2
KM3
M1
P11
P12
Q1
S1
S2
S3
Asterisk contactor
Network contactor
Triangle contactor
Burner motor
Service hour meter, stage 1 (optional)
Service hour meter, stage 2 (optional)
Main switch, motor supply line, ext.
Control box L&G LFL 1.322
ON / OFF switch
Reset switch
S4 Remote enable (optional)
S5 Switch, stages 1 - 2
T1 Ignition transformer
X11, X31 Male adapter, boiler control
X12,X32,X42 Female adapter, burner
X41 Male adapter, gas section
X8 Single-pole terminal strip
X9 Terminal strip
Y4 Positioning drive, L&G SQN 30.111
Y9 External gas solenoid valve
(connection option)
23. Wiring diagram MG3-Z-L-N-LN with star-delta-connection
See 27. connection plan A
see 26. Connection plan B
18
A1
B3
F1
F2
F4
H11
H12
H13
H2
Switch panel
UV sensor
Fuses, 16AT external,
on account of high motor current
Motor circuit-breaker
Air-pressure monitor
Pilot lamp, stage 1
Pilot lamp, stage 2
Lamp, fault indicator
Pilot lamp
E. 24.01.00 • G.19.03.03
K1
M1
P11
P12
Q1
S1
S2
S3
S4
S5
Motor contactor
Burner motor
Service hour meter, stage 1 (optional)
Service hour meter, stage 2 (optional)
Main switch, motor supply line, ext.
Control box L&G LFL 1.322
ON / OFF switch
Reset switch
Remote enable (optional)
Switch, stages 1 - 2
T1 Ignition transformer
X11, X31 Male adapter, boiler control
X12,X32,X42 Female adapter, burner
X41 Male adapter, gas section
X9 Terminal strip
Y4 Positioning drive, L&G SQN 30.111
Y9 External gas solenoid valve
(connection option)
24. Connection plan MG3-M-L-N-LN
See 27. connection plan A
E. 24.01.00 • G.19.03.03
see 26. Connection plan B
19
A1
B3
F1
F2
F4
H11
H12
H13
H2
Switch panel
UV sensor
Fuses, 16AT external,
on account of high motor current
Motor circuit-breaker
Air-pressure monitor
Pilot lamp, stage 1
Pilot lamp, stage 2
Lamp, fault indicator
Pilot lamp
KM1
KM2
KM3
M1
P11
P12
Q1
S1
S2
S3
Asterisk contactor
Network contactor
Triangle contactor
Burner motor
Service hour meter, stage 1 (optional)
Service hour meter, stage 2 (optional)
Main switch, motor supply line, ext.
Control box L&G LFL 1.322
ON / OFF switch
Reset switch
S4 Remote enable (optional)
S5 Switch, stages 1 - 2
T1 Ignition transformer
X11, X31 Male adapter, boiler control
X12,X32,X42 Female adapter, burner
X41 Male adapter, gas section
X9 Terminal strip
Y4 Positioning drive, L&G SQN 30.111
Y9 External gas solenoid valve
(connection option)
25. Connection plan MG3-M-L-N-LN with star-delta-connection
See 27. connection plan A
26. Connection plan, pinout MG3-Z-L-N-LN
Male adapter X31,X11 Female adapter X32,
to boiler
X12 on burner
T8
2
F22
T7
A
T6
P12
N
B5
H11
H12
N
P11
H13
S3
F21
T1
N
N
PE
PE
L1
L1
F3
Q1
2
3
3
4
T2
F11
1
X32
X31
B4
N
Female adapter X42 Male adapter X41
to KE
on burner
L1
C
6
PE
1
6
5
5
B5
F51
T6
Y1
T7
Y3
T8
4
PE
PE
3
N
N
2
L3
L3
L2
L1
L2
1
L1
X12
X11
N
Terminal strip X9
on control-unit
carrier
B
F12
Q2
27. Connection plan, pinout MG3-M-L-N-LN
Male adapter X31,X11
to boiler
Y11
Female adapter X32,
X12 on burner
auf
T8
zu
2
T7
3
T6
1
Female adapter X42
on burner
B5
H 11
X31
4
B4
P 11
N
H 13
5
T2
N
PE
PE
L1
L1
F 11
F3
X11
3
2
5
PE
N
B5
F 51
T6
Y1
T7
Y3
T8
PE
N
PE
N
L3
L3
L2
L1
L2
1
X12
L1
Terminal strip X9
on control-unit
carrier
B
F11 Fuse, max. 10A
F12 Fuse, 16AT*
F21 Control thermostat
F22 Control thermostat, stage 2
F3 Safety thermostat
F51 Gas-pressure monitor
Q1,Q2Heating main switch
H11 Pilot lamp
H12 Pilot lamp, stage 2
H13 Fault indicator lamp, external
1
C
L1
4
T1
N
Q1
6
S3
F 21
2
3
X32
N
6
Male adapter X41
to KE
F 12
Q2
L1 Phase 1
L2 Phase 2
L3 Phase 3
N Neutral conductor
PE Protective conductor
P11 Service hour meter, stage 1
P12 Service hour meter, stage 2
Y1 Solenoid valve, stage 1
Y3 Safety solenoid valve
Y11 Ext. controller (e. g. RWF 32)
* MG3..., on account of high motor current
20
E. 24.01.00 • G.19.03.03
A
NOTES
21
E. 24.01.00 • G.19.03.03
Enertech Limited,
P O Box 1,
Vines Lane
Droitwich,
Worcestershire,
WR9 8NA
Tel:
+44 (0) 1905 794331
Email: info@nu-way.co.uk
Fax:
Web:
+44 (0) 1905 794017
www.nu-way.co.uk
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