Riello RS 50/M MZ Instructions for use

Installation, use and maintenance instructions
Manuel d’entretien
2916463 (7) - 03/2012
Forced draught gas burners
Brûleurs gaz à air soufflé
CODE MODEL - MODÈLE TYPE
3781620 - 3781622 RS 50/M MZ 826T1
3781621 - 3781623 RS 50/M MZ 826T1
3781682 RS 50/M MZ 826T80
3781683 RS 50/M MZ 826T80
GB
F
Progressive two-stage or modulating operation
Fonctionnement à deux allures progressif ou modulant

6463
GB1
Declaration of conformity in accordance with ISO / IEC 17050-1
Manufacturer: RIELLO S.p.A.
Address: Via Pilade Riello, 7
37045 Legnago (VR)
Product: Forced draught gas burner
Model: RS 50/M MZ
These products are in compliance with the following Technical Standards:
EN 676
EN 12100
According to the European Directives:
GAD 2009/142/EC Gas Appliances Directive
MD 2006/42/EC Machine Directive
LVD 2006/95/EC Low Voltage Directive
EMC 2004/108/EC Electromagnetic Compatibility
Such products are marked as follows:
Legnago, 26.06.2007
CE-0085AQ0709 (826 T1)
The quality is guaranteed by a quality and management system
certified in accordance with UNI EN ISO 9001.
Manufacturer's Declaration
RIELLO S.p.A. declares that the following products comply with the NOx
limits specified by German standard “1. BImSchV 2009”.
Product Forced draught gas burner
Type 826T1
826T80
Model RS 50/M MZ
Legnago, 01.01.2010
Mr. G. Conticini
Burners Division Department
RIELLO S.p.A.

6463 GB2
Index
Section Page
1Information and general warnings 3
1.1 Information about the instruction manual 3
1.2 Guarantee and responsibility 3
2Safety and prevention 4
2.1 Introduction 4
2.2 Personnel training 4
3Technical description of the burner 5
3.1 Burner designation 5
3.2 Models available 5
3.3 Burner categories - Countries of destination 5
3.4 Technical data 6
3.5 Burner weight 6
3.6 Overall dimensions 6
3.7 Firing rates 7
3.8 Burner components 8
3.9 Burner equipment 8
3.10 Control box for the air/fuel ratio 9
3.11 Servomotor 9
4Installation 10
4.1 Notes on safety for the installation 10
4.2 Handling 10
4.3 Preliminary checks 10
4.4 Operating position 11
4.5 Securing the burner to the boiler 11
4.6 Combustion head adjustment 13
4.7 Assembly of the gas train 15
4.8 Electrical wiring 16
4.9 Calibration of the thermal relay 17
5Start-up, calibration and operation of the
burner 18
5.1 Notes on safety for the first start-up 18
5.2 Operations before start-up 18
5.3 Burner start-up 19
5.4 Burner ignition 19
5.5 Burner adjustment 19
5.6 Operation sequence of the burner 22
5.7 Burner flame goes out during operation 22
5.8 Stopping of the burner 22
5.9 Measuring the ionisation current 23
5.10 Checking the air and gas pressure on the com-
bustion head
23
5.11 Final checks (with burner operating) 23
6Faults - Probable causes - Solutions 24
6.1 Normal operation / flame detection time 25
7Maintenance 26
7.1 Notes on safety for the maintenance 26
7.2 Maintenance programme 26
7.3 Opening the burner 27
7.4 Closing the burner 27
AAppendix - Electrical panel layout 28
BAppendix - Accessories (optional) 33
CAppendix - Gas supply pressure 35
DAppendix - Firing rate on basis of air density 36

6463
GB3
Information and general warnings
1
1.1 Information about the instruction manual
Introduction
The instruction manual supplied with the burner:
is an integral and essential part of the product and must not
be separated from it; it must therefore be kept carefully for
any necessary consultation and must accompany the burn-
er even if it is transferred to another owner or user, or to
another system. If the manual is lost or damaged, another
copy must be requested from the Technical Assistance
Service of the area;
is designed for use by qualified personnel;
offers important indications and instructions relating to the
installation safety, start-up, use and maintenance of the
burner.
Symbols used in the manual
In some parts of the manual you will see triangular DANGER
signs. Pay great attention to these, as they indicate a situation
of potential danger.
The dangers can be of 3 levels, as indicated below.
Other symbols
Abbreviations used
Ch. Chapter
Fig. Figure
Page Page
Sec. Section
Tab. Table
Delivery of the system and the instruction manual
When the system is delivered, it is important that:
The instruction manual is delivered to the user by the sys-
tem manufacturer, with the recommendation to keep it in
the room where the heat generator is to be installed.
The instruction manual shows:
the serial number of the burner;
the address and telephone number of the nearest Assist-
ance Centre;
The system supplier must carefully inform the user about:
- the use of the system,
- any further tests that may be necessary before the sys-
tem is started up,
- maintenance and the need to have the system checked
at least once a year by the Manufacturer or another spe-
cialised technician.
To ensure a periodic check, recommends the
drawing up of a Maintenance Contract.
Maximum danger level!
This symbol indicates operations which, if
not carried out correctly, cause serious
injury, death or long-term health risks.
This symbol indicates operations which, if
not carried out correctly, may cause serious
injury, death or long-term health risks.
This symbol indicates operations which, if not
carried out correctly, may cause damage to
the machine and/or injury to people.
GENERAL DANGERS
DANGER
WARNING
CAUTION
This symbol indicates operations which, if
not carried out correctly, lead to electric
shocks with lethal consequences.
ENVIRONMENTAL PROTECTION
This symbol gives indications for the use of
the machine with respect for the environ-
ment.
This symbol indicates a list.
DANGER: LIVE COMPONENTS
DANGER
1.2 Guarantee and responsibility
guarantees its new products from the installation date, in
accordance with the regulations in force and/or the sales con-
tract. At the moment of the first start-up, check that the burner is
integral and complete.
Failure to observe the information given in this man-
ual, operating negligence, incorrect installation and
the carrying out of non authorised modifications will
result in the annulment by of the guarantee
that it supplies with the burner.
In particular, the rights to the guarantee and the responsibility
will no longer be valid, in the event of damage to things or injury
to people, if such damage/injury was due to any of the following
causes:
incorrect installation, start-up, use and maintenance of the
burner;
improper, incorrect or unreasonable use of the burner;
intervention of unqualified personnel;
carrying out of non authorised modifications on the
equipment;
use of the burner with safety devices that are faulty,
incorrectly applied and/or not working;
installation of untested supplementary components on the
burner;
powering of the burner with unsuitable fuels;
faults in the fuel power supply system;
use of the burner even following an error and/or an irregular-
ity;
repairs and/or overhauls incorrectly carried out;
modification of the combustion chamber with inserts that
prevent the regular development of the structurally estab-
lished flame;
insufficient and inappropriate surveillance and care of those
burner components most subject to wear and tear;
use of non-original components, including spare
parts, kits, accessories and optionals;
force majeure.
furthermore declines any and every responsibility
for the failure to observe the contents of this manual.
WARNING

6463 GB4
Safety and prevention
2
2.1 Introduction
The burners have been designed and built in compli-
ance with current regulations and directives, applying the
known technical rules of safety and envisaging all the poten-
tial danger situations.
It is necessary, however, to bear in mind that the imprudent
and clumsy use of the equipment may lead to situations of
death risk for the user or third parties, as well as the damag-
ing of the burner or other items. Inattention, thoughtlessness
and excessive confidence often cause accidents; the same
applies to tiredness and sleepiness.
It is a good idea to remember the following:
The burner must only be used as expressly described.
Any other use should be considered improper and there-
fore dangerous.
In particular:
it can be applied to boilers operating with water, steam,
diathermic oil, and to other users expressly named by the
manufacturer;
the type and pressure of the fuel, the voltage and frequency
of the electrical power supply, the minimum and maximum
deliveries for which the burner has been regulated, the pres-
surisation of the combustion chamber, the dimensions of the
combustion chamber and the room temperature must all be
within the values indicated in the instruction manual.
Modification of the burner to alter its performance and
destinations is not allowed.
The burner must be used in exemplary technical safety
conditions. Any disturbances that could compromise safe-
ty must be quickly eliminated.
Opening or tampering with the burner components is not
allowed, apart from the parts requiring maintenance.
Only those parts envisaged by the manufacturer can be
replaced.
2.2 Personnel training
The user is the person, body or company that has acquired the
machine and intends to use it for the specific purpose. He is
responsible for the machine and for the training of the people
working around it.
The user:
undertakes to entrust the machine exclusively to suitably
trained and qualified personnel;
must take all the measures necessary to prevent unauthor-
ised people gaining access to the machine;
undertakes to inform his personnel in a suitable way about
the application and observance of the safety instructions.
With that aim, he undertakes to ensure that everyone
knows the use and safety instructions for his own duties;
must inform the Manufacturer if faults or malfunctioning of
the accident prevention systems are noticed, along with
any presumed danger situation.
Personnel must always use the personal protective equip-
ment envisaged by legislation and follow the indications
given in this manual.
Personnel must follow all the danger and caution indica-
tions shown on the machine.
Personnel must not carry out, on their own initiative, oper-
ations or interventions that are not within their province.
Personnel must inform their superiors of every problem or
dangerous situation that may arise.
The assembly of parts of other makes or any modifications
can alter the characteristics of the machine and hence
compromise operating safety. The manufacturer therefore
declines any and every responsibility for any damage that
may be caused by the use of non-original parts.

6463
GB5
Technical description of the burner
3
3.1 Burner designation
3.2 Models available
3.3 Burner categories - Countries of destination
Designation Voltage Code
RS 50/M MZ TC 3 ~ 400 / 230V - 50Hz 3781620 - 3781622
RS 50/M MZ TL 3 ~ 400 / 230V - 50Hz 3781621 - 3781623
RS 50/M MZ TC 3 ~ 460 / 230V - 60Hz 3781682
RS 50/M MZ TL 3 ~ 460 / 230V - 60Hz 3781683
Country of destination Gas category
AT - CH - CZ - DK - EE - ES - FI - GB - GR - HU - IE
IS - IT - LT - LV - NO - PT - SE - SI - SK - TR I2E
NL I2L
FR I2Er
DE I2ELL
BE I2E(R)B
LU - PL I2E
Range : R
Size
Fuel : S
L
LS
Natural gas
Light oil
Light oil / Methane gas
Adjustment : E Electronic cam
EV Electronic cam and variable speed (with Inverter)
Head: TC Standard head
TL Long head
Flame control system:
FS1
FS2
Standard (1 stop every 24h)
Continuous operation (1 stop every 72h)
Electrical supply of the system:
3/400/50
3/230/50
Voltage of auxiliaries:
230/50/60
110/50/60
Emission : ... Class 1 EN267 (light oil) - EN676 (gas)
MZ Class 2 EN267 (light oil) - EN676 (gas)
BLU Class 3 EN267 (light oil) - EN676 (gas)
MX Class 2 EN267 (light oil)
Class 3 EN676 (gas)
3N / 400V / 50Hz
3 / 230V / 50Hz
230V/50-60Hz
110V/50-60Hz
N Heavy oil
M Mechanical cam
3/400-230/50 3N / 400V-230V / 50Hz
P Proportional air/gas valve
R S 50 M TC FS1 3/400/50 230/50/60
BASIC DESIGNATION
EXTENDED DESIGNATION
MZ

6463 GB6
Technical description of the burner
3
3.4 Technical data
(1) Reference conditions: Ambient temperature 20°C - Gas temperature 15°C - Barometric pressure 1013 mbar - Altitude 0 m above sea level.
(2) Gas pressure on the pipe coupling test point 8) (Fig. 5) with zero pressure in the combustion chamber and at maximum burner output.
(3) Sound pressure measured in manufacturer's combustion laboratory, with burner operating on test boiler and at maximum output.
3.5 Burner weight
3.6 Overall dimensions
Model RS 50/M MZ
Type 826T1 826T80
Output (1) maximum kW
Mcal/h
285 - 630
245 - 542
minimum kW
Mcal/h
80
69
Fuel Natural gas: G20 - G23 - G25
Gas pressure at max. output (2) -
Gas: G20/G25 mbar 8.5 - 11.3
Operation Intermittent (min. 1 stop in 24 hours)
Standard applications Boilers: water, steam, diathermic oil
Ambient temperature °C 0 - 40
Combustion air temperature °C max 60
Electrical supply 3 ~ 400V / 230V 1N ~ 230V +/-10%
50 Hz (See Chap. 3.2)
3 ~ 460V / 230V 1N ~ 230V +/-10%
60 Hz (See Chap. 3.2)
Fan motor (rating)
Operating current
Acceleration current
rpm
V
kW
A
A
2800
220/240 - 380/415
0.65
3 - 1.7
13.5 - 7.7
3400
208/230 - 380/460
0,55
3.2 - 1.6
22 - 20.5
Ignition transformer V1 - V2
I1 - I2
230 V - 1 x 8 kV
1 A - 20 mA
Absorbed electrical power kW max 0.75 0.66
Protection level IP 44
Noise level (3) dBA 72
(YY)
(Y)
The weight of the burner complete with its packaging is shown in
table.
mm kg
RS 50/M MZ 41
Fig. 1
D9098
The dimensions of the burner are shown in Fig. 2.
Bear in mind that inspection of the combustion head
requires the burner to be opened and the rear part drawn
back on the guides.
The dimensions of the open burner are indicated by posi-
tion H.
(1) Blast tube: short-long
mm A B C D(1) EFG H I LM
RS 50/M MZ 476 474 580 216 - 351 152 352 164 810 108 168 1"1/2
Fig. 2
D495

6463
GB7
Technical description of the burner
3
3.7 Firing rates
The firing rates were obtained in special test boilers,
according to EN 676 regulations.
Fig. 4 indicates the diameter and length of the test
combustion chamber.
Example
Output 407 kW (350 Mcal/h):
diameter 60 cm,
length 1.5 m.
The coupling is ensured when the boiler is EC type-
approved; for boilers or ovens with combustion
chambers of very different dimensions compared to
those shown in the diagram of Fig. 4, preliminary
checks are recommended.
Fig. 4
The maximum output is chosen within area A.
The minimum output must not be lower than the
minimum limit of the diagram.
Important
The firing rate was obtained considering an ambient
temperature of 20°C and an atmospheric pressure of
1013 mbar (approx. 0 m above sea level), with the
combustion head adjusted as shown in Ch. 4.6.
D497
Length of combustion
chamber - m
Mcal/h
kW
A
Fig. 3
D9090
Pressure in combus-
tion chamber - mbar

6463 GB8
Technical description of the burner
3
3.8 Burner components
3.9 Burner equipment
13
A12
3
5
6
7
8
10
9
18
19
17
16
12
25
24
11 23
15
14
4
21 22
20
26
1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 Maximum gas pressure switch
5 Air pressure switch
(differential operating type)
6 Flame sensor probe
7 Air pressure socket
8 Gas pressure test point and head fixing
screw
9 Screw securing fan to pipe coupling
10 Slide bars for opening the burner and
inspecting the combustion head
11 Servomotor controlling the gas but-
terfly valve and the air damper valve
(by means of an adjustable profile
cam mechanism).
When the burner is not operating the
air gate valve is fully closed in order
to reduce heat dispersion from the
boiler due to the flue draught which
draws air from the fan suction inlet.
12 Plate with four hole knock-outs for
electrical cable routing
13 Fan air inlet
14 Gas input pipe
15 Gas butterfly valve
16 Boiler fixing flange
17 Flame stability disc
18 Flame inspection window
19 Power switch for: automatic - manual
- off
Button for: power increase - power
reduction
20 Motor contact maker and thermal re-
lay with reset button
21 Control box with lockout pilot light
and lockout reset button
22 Terminal board for electrical wiring
23 Air damper
24 Tube connecting the fan suction line
to the air pressure switch
25 Bracket for application of output pow-
er regulator RWF40
26 Plug-socket on ionisation probe ca-
ble
RS 50/M MZ
Fig. 5
D8705
A
Seen from A
The burner is supplied complete with:
Gas train flange
Flange gasket
4 screws to fix the M8x25 flange:
4 screws to fix the M8x25 burner flange to the boiler
Thermal insulation screen
N° 6 cable grommets for electrical wiring
Instruction manual
Spare parts list

6463
GB9
Technical description of the burner
3
3.10 Control box for the air/fuel ratio
Introduction
The RMG/M 88.62... control box included in burners of RS range
is designed to control and start up forced draught gas burners
with intermittent operation.
In compliance with:
- Technical Standard EN676 (gas burners)
- Technical Standard EN298 (gas appliances)
Technical Data
3.11 Servomotor
The servomotor provides simultaneous adjustment for the air
damper, by means of the adjustable profile cam and the gas
butterfly valve.
The angle of rotation of the servomotor is equal to the angle
on the graduated sector controlling the gas butterfly valve.
The servomotor rotates by 90° in 24 seconds.
Do not alter the factory setting for the 4
cams; simply check that they are set as indi-
cated below:
Cam I: 90°
Limits rotation toward maximum position.
When the burner is at MAX output, the gas butterfly valve
must be fully open: 90°.
Cam II: 0°
Limits rotation toward minimum position.
When the burner is shut down, the air damper and gas butter-
fly valve must be closed: 0°.
Cam III: 15°
Adjusts the ignition position and the MIN output.
Cam IV: integrated to cam III.
All the installation, maintenance and disassembly
operations must be carried out with the electricity
supply disconnected.
To avoid damaging things or injuring people, do not
open or alter the control box.
The installation of the burner must be carried out
by qualified personnel, in compliance with the
standards and regulations of the laws in force.
Electrical supply AC 220.....240V
+10% / -15%
Frequency 50.....60 Hz +/- 6%
Internal fuse T6,3H250V
Operation below the nominal value of electrical supply
Minimum operation value
on reduction of electrical supply
below nominal value
approx. AC 160V
Minimum operation value
on increase in electrical supply
towards nominal value
approx. AC 175V
Maximum load of the contacts:
Alarm exit
Nominal power supply
Maximum current
AC 230V, 50/60 Hz
0.5 A
Allowed cable length
Thermostat
Air pressure switch
CPI
Gas pressure switch
Flame detector
Remote reset
max. 20 m at 100 pF/m
max. 1 m at 100 pF/m
max. 1 m at 100 pF/m
max. 20 m at 100 pF/m
max. 1 m
max. 20 m at 100 pF/m
M4 screws tightening torque max. 0.8 Nm
Fig. 6
DANGER
WARNING
WARNING
Fig. 7 D790

6463 GB10
Installation
4
4.1 Notes on safety for the installation
After carefully cleaning all around the area where the burner will be installed, and arranging the correct lighting of the environment,
proceed with the installation operations.
4.2 Handling
The packaging of the burner includes a wooden platform, so it is possible to move the burner (still packaged) with a transpallet truck or
fork lift truck.
4.3 Preliminary checks
Checking the consignment
After removing all the packaging, check the integrity of the contents. In the event of doubt, do not use the burner; contact the
supplier.
The packaging elements (wooden cage or cardboard box, nails, clips, plastic bags, etc.) must not be abandoned as they are
potential sources of danger and pollution; they should be collected and disposed of in the appropriate places.
Checking the characteristics of the burner
Check the identification label of the burner, showing:
the model (see Ain Fig. 8) and type of burner (B);
the year of manufacture, in cryptographic form (C);
the serial number (D);
the data for electrical supply and the protection level (E);
the electrical input power (F);
the types of gas used and the relative supply pressures
(G);
the data of the burner's minimum and maximum output
possibilities (H) (see Firing rate)
Warning. The output of the burner must be within the
boiler's firing rate;
the category of the appliance/countries of destination
(I).
All the installation, maintenance and disassem-
bly operations must be carried out with the elec-
tricity supply disconnected.
DANGER
The installation of the burner must be carried out
by qualified personnel, as indicated in this man-
ual and in compliance with the standards and
regulations of the laws in force.
WARNING
WARNING
The handling operations for the burner can be highly dangerous if not carried out with the greatest attention: keep any
unauthorised people at a distance; check the integrity and suitableness of the available means of handling.
Check also that the area in which you are working is empty and that there is an adequate escape area (i.e. a free, safe
area to which you can quickly move if the burner should fall).
During the handling, keep the load at not more than 20-25 cm from the ground.
After positioning the burner near the installation point, correctly dispose of all residual packaging, separating the various
types of material.
Before proceeding with the installation operations, carefully clean all around the area where the burner will be installed.
CAUTION
CAUTION
R.B. L.
GAS-KAASU
GAZ-AEPIO
0085
RIELLOS.p.A.
I-37045Legnago (VR)
CE
Fig. 8
A burner label that has been tampered with, re-
moved or is missing, along with anything else that
prevents the definite identification of the burner and
makes any installation or maintenance work diffi-
cult.
WARNING
D7738
ABC
EDF
HG
GH
I

6463
GB11
Installation
4.4 Operating position
The burner is designed to work only in the positions 1,
2, 3 and 4.
Installation 1is preferable, as it is the only one that al-
lows the maintenance operations as described in this
manual. Installations 2, 3 and 4 permit operation but
make maintenance and inspection of the combustion
head more difficult.
Any other position could compromise the correct opera-
tion of the appliance. Installation 5is prohibited for
safety reasons.
4.5 Securing the burner to the boiler
2 3 4 51
D7739
Fig. 9
12
11
9
8
6
4
7
14
1
2
3
13
13
100m
m
L
15 5
10
Boring the boiler plate
Make holes in the plate shutting off the combustion chamber, as illustrated in Fig. 10.
The position of the threaded holes can be marked using the thermal insulation
screen supplied with the burner.
mm ABC
RS 50/M MZ 160 224 M8
Preparing the boiler
Fig. 10 D455
Length of the blast tube
The length of the blast tube must be selected according to the indications pro-
vided by the manufacturer of the boiler, and in any case it must be greater than
the thickness of the boiler door complete with its refractory.
The available lengths L are those indicated in the table below.
For boilers with front flue passes 13) or flame inver-
sion chamber, a protection in refractory material
11) must be inserted between the boiler fettling 12)
and the blast tube 10).
This protection must not compromise the extraction
of the blast tube. See Fig. 11.
For boilers with a water-cooled frontal, a refractory
lining is not necessary 11)-12) unless expressly
requested by the boiler manufacturer.
Blast tube short long
RS 50/M MZ 216 mm 351 mm
Fig. 11
D8706
4

6463 GB12
Installation
Securing the burner to the boiler
Before fixing the burner to the boiler, check from the
opening of the blast tube that the probe and the elec-
trode are correctly positioned, as in Fig. 12.
If, in the previous check, the position of the probe or
electrode was not correct, remove the screw 1)(Fig. 13),
extract the inner part 2)(Fig. 13) of the head, and cali-
brate them.
Do not rotate the probe: leave it as in Fig. 12 since if it is
located too close to the ignition electrode, the control
box amplifier may be damaged.
Separate the combustion head from the rest of the
burner, Fig. 11.
To do this, proceed as follows:
- remove screw 14) and withdraw the cover 15);
- disengage the articulated coupling 4) from the gradu-
ated sector 5);
- remove screws 2) from the two slide bars 3);
- remove screw 1) and pull the burner back on slide bars
3) by about 100 mm;
- disconnect the wires from the probe and the electrode
and then pull the burner completely off the slide bars,
after removing the split pin from the slide bar 3).
Once this operation has been carried out, fix the flange
9)(Fig. 11) to the boiler plate, interposing the insulating
gasket 6)(Fig. 11) supplied.
Use the 4 screws supplied, with a tightening torque of
35 ÷ 40 Nm, after protecting their thread with anti-seize
products.
The seal between burner and boiler must be airtight.
After the start-up (see Ch. 5.3), check there is no leak-
age of flue gases into the external environment.
1
2
Probe Electrode
Fig. 13
D613 Fig. 12
D8707
4

6463
GB13
Installation
4.6 Combustion head adjustment
At this stage of installation, the blast tube and the pipe coupling
are secured to the boiler as shown in Fig. 15.
Therefore it is particulary easy to carry out the combustion
head adjustments: air and gas.
There are two possible cases:
In the diagram of Fig. 16, find the notch at which both air and gas
can be adjusted according to the MAX output, then:
Air adjustment
Rotate the screw 4) until the notch you have found corresponds
with the front surface 5) of the flange.
Central gas adjustment
Loosen the screw 1) and turn ring nut 2) until the notch identified is
aligned with index 3).
Tighten the screw 1) fully down.
Example:
the burner varies output between MIN = 130 and MAX = 460 kW.
The gas and air adjustments for this output are carried out on
notch 3, like in Fig. 15.
The loss of pressure in the combustion head is shown in column 1
on page 35.
NOTE
The dicagram shows the ideal settings for the ring nut 2).
If ring nut 2) is only partially opened, the ring nut can be further
opened 1-2 notch if pressure in the gas feeding network is very
low and pressure indicated on page 35 in MAX gas cannot be
reached.
To continue the preceding example, on page 35, it can be seen
that 5.4 mbar of pressure in socket 6) are needed for a burner
with 460 kW of power. If this pressure is not available, open 4-5
notch ring nut 2).
Check that the combustion is satisfactory and without pulsa-
tions.
Air adjustment
The same as the previous case: follow the diagram.
Central gas adjustment
The ring nut 2) is always adjusted to position 0, irrespective of
the MAX burner output.
MINIMUM OUTPUT MODULATIONS:
when the MIN output is between 80 - 129 kW, the
ring nut 2) value must be adjusted to 0.
The MINIMUM burner output is over 130 kW.
The MINIMUM burner output is lower than 130 kW.
6
213
5
4
Maximum burner output
D8708
Fig. 15
No. of notches
Fig. 16
D9091
WARNING
4

6463 GB14
Installation
4
Once the combustion head adjustment is completed:
reassemble the burner 4) on the slide bars 3) at about
100 mm from the pipe coupling 5) - burner in the position
shown in Fig. 11;
insert the probe and electrode cables, then slide the
burner as far as the pipe coupling - burner in the position
shown in Fig. 17;
refit the screws 2) on the slide bars 3);
fix the burner to the pipe coupling with the screw 1).
refit the split pin into one of two slide bars 3).
re-couple the articulated coupling 6) to the graduated sec-
tor 7).
When fitting the burner on the two guides, it is
advisable to gently draw out the high voltage cable
and flame detection probe cable until they are
slightly taut.
CAUTION
123 4
5
6
7
Fig. 17
D8709

6463
GB15
4.7 Assembly of the gas train
The gas train is type-approved according to standard EN 676 and is
supplied separately from the burner, with the code indicated in Appen-
dix B.
The gas train can enter the burner from the right or left side, depend-
ing on which is the most convenient, see Fig. 18.
The gas train must be connected to the gas attachment 1)(Fig. 18)
with the flange 2), the gasket 3) and the screws 4) supplied with the
burner.
The gas solenoids must be as close as possible to the burner, to
ensure that the gas reaches the combustion head within the safety
time of 3s.
Ensure that the maximum pressure necessary for the burner is
included in the calibration field of the pressure adjuster (colour of the
spring).
The losses of load along the gas supply line are indicated in Appendix C.
See the accompanying instructions for the adjustment of
the gas train.
Fig. 18
D505
WARNING
Fig. 19
D1062
1 - Gas input pipe
2 - Manual valve
3 - Vibration damping joint
4 - Pressure gauge with pushbutton cock
5-Filter
6 - Pressure adjuster (vertical)
7 - Minimum gas pressure switch
8 - Safety solenoid VS (vertical)
9 - Adjustment solenoid VR (vertical)
10 - Two adjustments:
• ignition delivery (rapid opening)
• maximum delivery (slow opening)
11 - Standard issue burner gasket with flange
12 - Gas adjustment butterfly valve
13 - Burner
14 - Valve 8)-9) leak detection control device.
15 - In compliance with the EN 676 standard, gas valve
leak detection control devices are compulsory for
burners with maximum outputs over 1200 kW.
16 - Gas train/burner adaptor
17 - Maximum gas pressure switch
18 - P1-Pressure at combustion head
19 - P2-Pressure down-line from the pressure adjuster
20 - P3-Pressure upline the filter
L - Gas train supplied separately with the code
indicated in Appendix B
L1 - The responsibility of the installer
Installation
4

6463 GB16
Installation
4.8 Electrical wiring
If the hood is still present, remove it and proceed with the
electrical wiring according to the layouts shown in Appen-
dix A.
Use flexible cables in compliance with the EN 60 335-1
standard.
All cables to be connected to the plugs 7 (Fig. 20) of
the burner are passed through supplied cable grom-
mets that must be inserted into the holes of the left-
hand and right-hand plate, after having unscrewed
screws 8), opened the plate in part 9) and 10) and
removed the thin diaphragm that blocks the holes.
The fairleads and hole press-outs can be in various
ways; by way of example we indicate the following
mode:
1-Pg 11 Three-phase power supply
2-Pg 11 Single-phase power supply
3-Pg 9 Remote control TL
4-Pg 9 Remote control TR or probe (RWF40)
5-Pg 11 Gas valves (when RG1/CT or LDU 11 leak
detection control device is not fitted)
6-Pg 11 Gas pressure switch or valve leak detection
control device
Notes on safety for the electrical wiring
The electrical wiring must be carried out with the electrical supply disconnected.
Electrical wiring must be carried out by qualified personnel and in compliance with the regulations currently in force in
the country of destination. Refer to the electrical layouts given in Appendix A.
declines all responsibility for modifications or connections different from those shown in the electrical lay-
outs.
Check that the electrical supply of the burner corresponds to that shown on the identification label and in this manual.
See Fig. 8.
Do not invert the neutral with the phase in the electrical supply line.Any inversion would cause a lockout due to igni-
tion failure.
RS50/M MZ burners have been approved for intermittent operation. This means they should compulsorily be
stopped at least once every 24 hours to enable the control box to perform checks of its own start-up efficiency.
Normally, burner stopping is guaranteed by the boiler's thermostat/pressure switch.
If this is not the case, a time switch should be fitted in series to IN to provide for burner shutdown at least once every
24 hours. Refer to the electrical layouts given in Appendix A.
The electrical safety of the device is obtained only when it is correctly connected to an efficient earthing system,
made according to current standards. It is necessary to check this fundamental safety requirement. In the event of
doubt, have the electrical system checked by qualified personnel. Do not use the gas tubes as an earthing system for
electrical appliances.
The electrical system must be suitable for the maximum input power of the device,as indicated on the label and in the
manual, checking in particular that the section of the cables is suitable for the input power of the appliance.
For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- use an omnipolar switch with an opening of at least 3 mm between the contacts, as indicated by the current safety
standards.
Do not touch the device with wet or damp body parts and/or in bare feet.
Do not pull the electric cables.
DANGER
Fig. 20
5
1098
6
7
4
3
2
1
D8710
4

6463
GB17
4.9 Calibration of the thermal relay
The thermal relay serves to avoid damage to the motor due to an exces-
sive absorption increase or if a phase is missing.
The protection is in any case ensured even if the minimum value of the
thermal relay scale is over the rating absorption of the motor.
This occurs when the motor power supply is 400V.
To reset, in case of an intervention of the thermal relay, press button 1)
of Fig. 21.
• If the motor is star-driven, 400V, the cursor must be positioned on "MIN".
• If it is delta-driven, 230V, the cursor is positioned on "MAX".
Even if the scale of the thermal relay does not include rated motor absorp-
tion at 400V, protection is still ensured in any case.
NOTE
The RS 50/M MZ models leave the factory preset for 400V power supply.
If 230V power supply is used, change the motor connection from star to
delta and change the calibration of the thermal relay as well.
• If the motor is star-driven, 380-460V, the cursor must be positioned on "MIN".
• If it is delta-driven, 208-230V, the cursor is positioned on "MAX".
Even if the scale of the thermal relay does not include rated motor absorption at 380 -460V, protection is still ensured in any case.
NOTE
The RS 50/M MZ models leave the factory preset for 380-460V power supply.
If 208 -230V power supply is used, change the motor connection from star to double star and change the calibration of the ther-
mal relay as well.
Fig. 21
2
1
D8267
Voltage 3 ~ 400 / 230V - 50Hz
Voltage 3 ~ 460 / 230V - 60Hz
(Y)
(YY)
Installation
4

6463 GB18
Start-up, calibration and operation of the burner
5.1 Notes on safety for the first start-up
5.2 Operations before start-up
Ensure that the gas supply company has carried out the supply line vent operations, eliminating air or inert gases from the piping.
Slowly open the manual valves situated upstream of the gas train.
Adjust the minimum gas pressure switch (Fig. 22) to the start of the scale.
Adjust the maximum gas pressure switch (Fig. 23) to the end of the scale.
Adjust the air pressure switch (Fig. 24) to the start of the scale.
Check the gas supply pressure by connecting a
pressure gauge to the pressure test point 1)(Fig. 25)
of the minimum gas pressure switch: it must be low-
er than the maximum allowed pressure of the gas
train, as shown on the characteristics label.
Bleed the air from the piping of the gas train, con-
necting a plastic tube to the pressure test point
1)(Fig. 25) of the minimum gas pressure switch.
Take the vent tube outside the building so you can
notice the smell of gas.
Connect two lamps or testers to the two gas line
solenoids to check the exact moment at which
voltage is supplied.
This operation is unnecessary if each of the two
solenoids is equipped with an indicator light that
signals voltage passing through.
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
Check the correct working of the adjustment, com-
mand and safety devices.
An excessive gas pressure can
damage the components of the gas
train and lead to a risk of explosion.
Before starting up the burner, it is good
practice to adjust the gas train so that
ignition takes place in conditions of
maximum safety, i.e. with gas delivery at
the minimum.
WARNING
WARNING
Fig. 22
Minimum gas pressure switch
Fig. 23
Maximum gas pressure switch
Fig. 24
D3854
Air pressure switch
D3856
D3855
E9331
Fig. 25
1
DANGER
WARNING
5