Riello RS 50/E MZ Quick start guide

20005963 (3) - 06/2010
Installation, use and maintenance instructions
Forced draught gas burners
Code Model Type
3781632 RS 50/E MZ 826 T2
3781633 RS 50/E MZ 826 T2
GB
Progressive two-stage or modulating operation

20005963 GB2
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/E MZ
Theseproductsareincompliancewiththefollowing Technical Standards:
EN 676
EN 292
According to the European Directives:
GAD 2009/142/EC Gas Devices Directive
MD 2006/42/EC Machine Directive
LVD 73/23/EEC - 2006/95/EC Low Voltage Directive
EMC 89/336/EEC - 2004/108/EC Electromagnetic Compatibility
Such products are marked as follows:
Legnago, 22.06.2007
CE-0085XXXXXX
Mr. G. Conticini
Burners Division Department
The quality is guaranteed by a quality and management system
certified in accordance with UNI EN ISO 9001.

20005963 GB3
Contents
Section Page
1Information and general warnings 4
1.1 Information about the instruction manual 4
1.2 Guarantee and responsibility 4
2Safety and prevention 5
2.1 Introduction 5
2.2 Personnel training 5
3Technical description of the burner 6
3.1 Burner designation 6
3.2 Models available 6
3.3 Burner categories - Countries of destination 6
3.4 Technical data 7
3.5 Burner weight 7
3.6 Overall dimensions 7
3.7 Firing rate 8
3.8 Burner components 9
3.9 Burner equipment 9
3.10 Control box for the air/fuel ratio 10
3.11 Servomotors 11
4Installation 12
4.1 Notes on safety for the installation 12
4.2 Handling 12
4.3 Preliminary checks 12
4.4 Operating position 13
4.5 Securing the burner to the boiler 13
4.6 Combustion head adjustment 15
4.7 Assembly of the gas train 17
4.8 Electrical wiring 18
4.9 Calibration of the thermal relay 19
5Start-up, calibration and operation of the
burner 20
5.1 Notes on safety for the first start-up 20
5.2 Operations before start-up 20
5.3 Burner start-up 21
5.4 Final calibration of the pressure switches 21
5.5 Operator panel with LCD display 23
5.6 Visualisation and programming modes 24
5.7 Operation sequence of the burner 29
5.8 Start-up procedure 30
5.9 CALC function 32
5.10 Burner adjustment 32
5.11 Steady state operation 33
5.12 Ignition failure 33
5.13 Burner flame goes out during operation 33
5.14 Stopping of the burner 33
5.15 Measuring the ionisation current 33
5.16 Checking the air and gas pressure on the com-
bustion head 33
5.17 Final checks (with burner operating) 34
5.18 List of parameters 34
6Faults - Probable causes - Solutions 38
6.1 List of error codes 38
7Maintenance 42
7.1 Notes on safety for the maintenance 42
7.2 Maintenance programme 42
7.3 Opening the burner 43
7.4 Closing the burner 43
AAppendix - Electrical panel layout 44
BAppendix - Accessories (on request) 51
CAppendix - Gas supply pressure 53
DAppendix - Firing rate on basis of air density 54

20005963 GB4
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 burner even
if it is transferred to another owner or user, or to another sys-
tem. 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 in-
stallation 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 consigned to the user by the system
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 Assistance
Centre.
The system supplier must carefully inform the user about:
- the use of the system;
- any further tests that may be necessary before the system
is started up;
- maintenance and the need to have the system checked at
least once a year by the manufacturer or another specialised
technician.
To ensure a periodic check, recommends the draw-
ing 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
manual, operating negligence, incorrect installation
and 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
irregularity;
repairs and/or overhauls incorrectly carried out;
modification of the combustion chamber with inserts that
prevent the regular development of the structurally
established 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

20005963 GB5
Safety and prevention
2
2.1 Introduction
The burners have been designed and built in compliance
with current regulations and directives, applying the known tech-
nical rules of safety and envisaging all the potential danger situ-
ations.
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 damaging of the burner
or other items. Inattention, thoughtlessness and excessive confi-
dence 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 therefore dan-
gerous.
In particular:
it can be applied to boilers operating with water, steam, dia-
thermic oil, and to other users expressly named by the man-
ufacturer;
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 desti-
nations is not allowed.
The burner must be used in exemplary technical safety con-
ditions. Any disturbances that could compromise safety must
be quickly eliminated.
Opening or tampering with the burner components is not al-
lowed, apart from the parts requiring maintenance.
Only those parts envisaged by the manufacturer can be re-
placed.
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 re-
sponsible for the machine and for the training of the people work-
ing 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 pre-
sumed 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 indications
shown on the machine.
Personnel must not carry out, on their own initiative, opera-
tions or interventions that are not within their province.
Personnel are obliged to inform their superiors of every prob-
lem 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 com-
promise operating safety. The manufacturer therefore de-
clines any and every responsibility for any damage that may
be caused by the use of non-original parts.

20005963 GB6
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/E MZ TC 3 ~ 400 / 230V - 50Hz 3781632
RS 50/E MZ TL 3 ~ 400 / 230V - 50Hz 3781633
Country of destination Gas category
AT - CH - CZ - DK - EE - ES - FI - GB - GR
HU - IE - IS - IT - LT - LV - NO - PT - SE I2H
DE I2ELL
NL I2L
FR I2Er
BE I2E(R)B
LU I2E
Range : R
Size
Fuel : S
L
LS
Natural gas
Light oil
Light oil / Methane
Adjustment : E Electronic cam
EV Electronic cam with 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 1 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 E TC FS1 3/400/50 230/50/60
BASIC DESIGNATION
EXTENDED DESIGNATION
MZ

20005963 GB7
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 20) (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
3.1 Overall dimensions
Model RS 50/E MZ
Type 826 T2
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 / 230 V 1N ~ 230V +/-10% 50 Hz (See Chap. 3.2)
Fan motor (rating)
Operating current
Acceleration current
rpm
V
kW
A
A
2800
230/400
0,65
3 - 1.7
15 - 8.5
Ignition transformer V1 - V2
I1 - I2 220/240 V - 1 x 15 kV 45 VA - 25 mA
Absorbed electrical power kW max 1.09
Protection level IP 44
Noise level (3) dBA 72,0
Type-approval class 2 (EN 676) EC in progress
The weight of the burner complete with its packaging is shown in table.
(1) Blast tube: short-long
mm kg (1)
RS 50/E MZ 41 - 43
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/E MZ 476 474 565 240 - 375 152 352 140 800 86 168 1”1/2
Fig. 2
D495

20005963 GB8
Technical description of the burner
3
3.1 Firing rate
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

20005963 GB9
Technical description of the burner
3
3.8 Burner components
3.9 Burner equipment
19 203 1256
10
9
8
12
7
14 23 17
22
29
28
16
21
24
15
4
2
18
11
30
13
5
27
26
1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 Pipe coupling
5 Gas servomotor
6 Plug-socket on ionisation probe cable
7Motorrelay
8 1-0 Operation on/off switch
9 Terminal board for electrical wiring
10 Operator panel with LCD display
11 Control box for checking flame and air/
fuel ratio
12 Clean contacts relay
13 Filter to protect against radio distur-
bance
14 Flame inspection window
15 Ignition transformer
16 Cable grommets for electrical wiring
(to be carried out by the installer)
17 Air servomotor
18 Air pressure switch
(differential operating type)
19 Slide bars for opening the burner and
inspecting the combustion head
20 Gas pressure test point and head fix-
ing screw
21 Air pressure socket
22 Flame sensor probe
23 Air damper
24 Fan air inlet
25 Screw securing fan to pipe coupling
26 Gas input pipe
27 Gas regulator
28 Boiler fixing flange
29 Flame stability disc
30 Bracket for application of output power
regulator RWF40
Fig. 5
seen from A
A
D8741
The burner is supplied complete with:
Gas train flange
Flange gasket
4 screws to fix the flange: M8 x 25
4 screws to fix the burner flange to the boiler:
M8 x 25
Thermal insulation screen
N° 4 plugs for electrical wiring
Instruction manual
Spare parts list

20005963 GB10
Technical description of the burner
3
3.10 Control box for the air/fuel ratio
Introduction
The control box for the air/fuel ratio (hereafter referred to simply
as the control box), that equips the burners of the RS range, car-
ries out a series of integrated functions in order to optimise
burner functioning, both for single operation and together with
other units (e.g. double furnace boiler or more than one genera-
tor at the same time).
The basic functions carried out by the control box relate to:
1. flame control;
2. the dosage of air and fuel via the positioning (with direct ser-
vocontrol) of the relative valves, excluding the possible play in
the mechanical cam calibration systems;
3. the modulation of burner output, on the basis of the load
requested by the system, maintaining the pressure or temper-
ature of the boiler at the working values set;
4. the safety diagnostic of the air and fuel circuits, via which it is
possible to easily identify any causes of malfunctioning.
Further interfaces and computer communication functions (for
remote control or integration in central supervision systems) are
available according to the system configuration.
Technical data
Fig. 6
D8266
NOTE
The first start-up, like every further operation
for the internal settings of the control box,
requires access by means of a password and
is only to be carried out by personnel of the
Technical Assistance Service who have been
specifically trained in the internal program-
ming of the tool.
The information for the first start-up is given
below.
WARNING
Electrical supply AC 230V - 15% /
+10%
Frequency 50/60 Hz +/- 6%
Internal fuse 6.3 A T
Operation below the nominal value of electrical supply
Minimum operation value on reduction
of electrical supply below nominal
value
approx. AC 186V
Minimum operation value on increase
in electrical supply towards nominal
value
approx. AC 195V
Maximum load of the contacts:
Fan motor relay
Nominal power supply
Nominal current
Output factor
AC 230V, 50/60 Hz
2A
cos> 0.4
Alarm exit
Nominal power supply
Nominal current
Output factor
AC 230V, 50/60 Hz
1A
cos> 0.4
Ignition transformer
Nominal power supply
Nominal current
Output factor
AC 230V, 50/60 Hz
2A
cos> 0.2
Fuel valves
Nominal power supply
Nominal current
Output factor
AC 230V, 50/60 Hz
2A
cos> 0.4
Operator panel
Nominal power supply
Protection level
Input power
DC 5V
IP 40
< 50 mW
Length of cables
Electrical supply line AC 230V
Display max. 100m (100 pF/m) max. 3m (100 pF/m)
Output regulator
Remote reset button max. 20m (100 pF/m) max. 20m (100 pF/m)

20005963 GB11
3.11 Servomotors
Technical data Fuel
servomotor Air servomotor
Model SQN13.1.. SQN13.1..
Type of motor Stepping motor
Electrical supply AC/DC 24V
Protection level IP40
Firing rate 0 - 90°
Opening time 0 - 90° min: 5 s, max.: 120 s depending on the type of control box
Torque 0.7 Nm 0.7 Nm
Input power 7.5W 7.5W
Rotation Anti-clockwise
Introduction
The servomotors that equip the burners of the RS range work directly on
the air damper and the gas butterfly valve, without mechanical lever-
ages but via the interposition of a coupling.
They are commanded by the control box, which constantly checks their
position by means of a return signal from the optic sensor inside the ser-
vomotor.
For this reason it is absolutely forbidden to remove
the cover of the servomotors.
The position (in degrees) of the servomotors can be seen on the display
of the operator panel. See Ch. 5.18, Parameter 922, index “0” for fuel
servomotor, index “1” for air servomotor.
The servomotors are electrically connected to the control box by means
of RAST 2.5 type connectors.
When servicing or replacing the servomotors, take care not to invert
the connectors. Follow the indications given in the electrical layouts or
the silkscreen printing on the control box cover.
WARNING
Fig. 7
D8083
Technical description of the burner
3

20005963 GB12
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 burner output 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
electricity 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
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
R.B.L.
GAS-KAASU
GAZ-AEPIO
0085
RIELLO S.p.A.
I-37045 Legnago (VR)
CE
Fig. 8 D7738
ABC
EDF
HG
GH
I

20005963 GB13
Installation
4.4 Operating position
The burner is designed to operate only in the positions 1, 2,
3 and 4.
Installation 1is preferable, as it is the only one that allows
the maintenance operations as described in this manual. In-
stallations 2, 3 and 4 permit operation but make mainte-
nance and inspection of the combustion head more difficult.
Any other position could compromise the correct operation
of the appliance.
Installation 5is prohibited for safety reasons.
4.5 Securing the burner to the boiler
2 3 4 51
D3928
Fig. 9
Preparing the boiler
L
3
14 2
9 8
11
12
15
41
13
13
10
5
100 mm
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.
Fig. 11
Length of the blast tube
The length of the blast tube must be selected according to the
indications provided 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 lengths L available are:
Blast tube 10) RS 50/E MZ
• short 216 mm
• long 351 mm
For boilers with front flue passes 13), a protection in refractory
material 11) must be inserted between the boiler refractory 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.
D8743
mm ABC
RS 50/E MZ 160 224 M 8
Fig. 10
D455
4

20005963 GB14
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:
loosen the screw 3) and remove the hood 1);
remove the screws 2) from the two guides 5);
disconnect the plug 14), unscrew the grommet 15);
remove the screw 4);
pull back the burner on the guides 5) by about
100 mm;
disconnect the probe and electrode cables and
remove the entire burner from the guides, after hav-
ing removed the split pin from the guide 5).
Fix the flange 9)(Fig.11) to the boiler plate, interposing
the supplied insulating gasket 8)(Fig.11).
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. 5.8), check there is no leak-
age of flue gases into the external environment.
2
1
3
Probe Electrode
Fig. 13
D613 Fig. 12
D8744
4

20005963 GB15
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. 14
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. 15, 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 its 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. 14.
The loss of pressure in the combustion head is shown in column 1
on page 53.
NOTE
The diagram 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 the pressure indicated on page 53 in MAX gas cannot
be reached.
To continue the preceding example, on page 53, it can be seen
that 5.4 mbar of pressure in socket 6) are needed for a burner
with a 460 kW output. 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.
Important
To facilitate adjustment, loosen the screw 6), adjust
and then lock.
The MINIMUM burner output is lower than 130 kW.
No. of notches
4
6
5
2
3
1
D9099
Fig. 14
Fig. 15
D9091 Maximum burner output
WARNING
CAUTION
4

20005963 GB16
Installation
Once the combustion head adjustment is completed:
reassemble the burner on the guides 3) at about 100 mm from the pipe coupling 4) - 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. 16;
connect the plug of the servomotor 14)(Fig. 11) and tighten the cable grommet 15)(Fig. 11);
refit the screws 2) and the split pin on the guides 3);
fix the burner to the pipe coupling with the screw 1).
When fitting the burner on the two slide bars, it is advisable to gently draw out the high voltage cable and the flame detec-
tion probe cable until they are slightly stretched.
CAUTION
4
2
3 1
5
Fig. 16
D8747
4

20005963 GB17
4.7 Assembly of the gas train
The gas train is type-approved according to standard EN 676 and is sup-
plied separately from the burner, with the code indicated in Appendix B.
The gas train can enter the burner from the right or left side, depending
on which is the most convenient, see Fig. 17.
The gas train must be connected to the gas attachment 1)(Fig. 17) 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 to the burner is within the calibration
range of the pressure adjuster.
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.
D505
Fig. 17
WARNING
Fig. 18
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.
In compliance with the EN 676 standard, gas
valve leak detection control devices are com-
pulsory for burners with maximum outputs over
1200 kW.
15 - Gas train/burner adaptor
16 - Maximum gas pressure switch
17 - P1-Pressure at combustion head
18 - P2-Pressure down-line from the pressure
adjuster
19 - 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

20005963 GB18
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) of the burner
are passed through supplied cable grommets 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.
See Fig. 19.
The use of the cable grommets and the pre-blanked
holes can be done in different manners; By way of exam-
ple we indicate the following mode:
RS 50/E MZ
1 - Pg 11 Three-phase power supply
2 - Pg 11 Gas valves
3 - Pg 9 Thermostat/Pressure switch TL
4 - Pg 9 Thermostat/Pressure switch TR
5 - Pg 11 Gas pressure switch for valve leak detec-
tion
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 layouts.
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 firing
failure.
The RS 50/E MZ burner has been approved for internal use.
This means that it should compulsorily be stopped at least once every 24 hours to enable the control box to per-
form 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 stopping 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 devices.
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 device.
For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- use a multiple pole switch with at least a 3 mm gap between the contacts (overvoltage category: III), as foreseen by
the present safety standards.
Do not touch the device with wet or damp body parts and/or in bare feet.
Do not pull the electric cables.
NOTE - Modulating operation
If connecting the output power regulator kit RWF40,
the TR thermostat/pressure switch and the TL
thermostat/pressure switch must be removed.
DANGER
5
6
109
8
4
3
2
1
7
Fig. 19
D8748
A
4

20005963 GB19
4.9 Calibration of the thermal relay
The thermal relay serves to avoid damage to the motor due to an
excessive absorption increase or if a phase is missing.
Refer to the table in wiring diagram 6 od Appendix A for the calibration.
• If the motor is star-driven, 400 V, the cursor must be positioned on
"MIN".
• If it is delta-driven, 230 V, the cursor is positioned on "MAX".
Even if the scale of the thermal relay does not include rated motor
absorption at 400 V, protection is still ensured in any case.
Fig. 20
2
1
D8267
Installation
4

20005963 GB20
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. 21) to the start of the scale.
Adjust the maximum gas pressure switch (Fig. 22) to the end of the scale.
Adjust the air pressure switch (Fig. 23) to the start of the scale.
Adjust the pressure switch for the valve leak detection control device (PVP kit) (Fig. 24), if present, according to the instructions
supplied with the kit itself.
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 so-
lenoids to check the exact moment at which voltage
is supplied.
This operation is unnecessary if each of the two so-
lenoids is equipped with an indicator light that sig-
nals 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 dam-
age 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. 21
Minimum gas pressure switch
Fig. 22
Maximum gas pressure switch
Fig. 23
D3854
Air pressure switch
D3855
D3856
Fig. 24
Pressure switch PVP kit
D3855 D3855
Fig. 25
1
D8915
DANGER
WARNING
Start-up, calibration and operation of the burner
5