Riello 40 GS20 Quick start guide

2902728 (4) - 11/2008
Manuel d’entretien
Installation, use and maintenance instructions
Montage und Bedienungsanleitung
Instrucciones para la instalación, uso y mantenimiento
Installatie-, gebruiks- en onderhoudsvoorschriften
Gas-Gebläsebrenner
Brûleur gaz à air soufflé
Forced draught gas burner
Gasventilatorbrander
Quemador de gas de aire soplado
CODE
CÓDIGO MODELL - MODELE MODEL - MODELO TYP - TYPE TIPO
3755616 GS20 556T1
D
F
GB
NL
E
Einstufiger Betrieb
Fonctionnement à 1 allure
One stage operation
Eentrapsbranders
Funcionamiento de una etapa

2728 1GB
INDEX
1. BURNER DESCRIPTION
Gas burner with one stage working.
1.1 BURNER EQUIPMENT
Insulating gasket . . . . . . . . . . . . .No. 1 Screws and nuts for flange to be fixed to boiler . . No. 4
Cable grommet . . . . . . . . . . . . . .No. 1 Screw for fixing the cover. . . . . . . . . . . . . . . . . . . No. 1
Hinge. . . . . . . . . . . . . . . . . . . . . .No. 1 7 pin plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
1. BURNER DESCRIPTION . . . . . . . . . . . 1
1.1 Burner equipment . . . . . . . . . . . . . . . . . 1
2. TECHNICAL DATA. . . . . . . . . . . . . . . . 2
2.1 Technical data. . . . . . . . . . . . . . . . . . . . 2
2.2 Overall dimensions . . . . . . . . . . . . . . . . 2
2.3 Working field. . . . . . . . . . . . . . . . . . . . . 2
3. INSTALLATION . . . . . . . . . . . . . . . . . . 3
3.1 Boiler fixing . . . . . . . . . . . . . . . . . . . . . . 3
3.2 Probe-electrode positioning. . . . . . . . . . 4
3.3 Gas feeding line . . . . . . . . . . . . . . . . . . 4
3.4 Electrical wiring. . . . . . . . . . . . . . . . . . . 5
3.4.1 Standard electrical wiring . . . . . . . . . . . 5
3.4.2 Electrical wiring with gas leak control
device . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. WORKING . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Combustion adjustment. . . . . . . . . . . . . . 6
4.2 Combustion head setting. . . . . . . . . . . . . 6
4.3 Air damper setting. . . . . . . . . . . . . . . . . . 7
4.4 Combustion check. . . . . . . . . . . . . . . . . . 7
4.5 Air pressure switch . . . . . . . . . . . . . . . . . 7
4.6 Burner start-up cycle. . . . . . . . . . . . . . . . 8
4.7 Start-up cycle diagnostics . . . . . . . . . . . . 8
4.8 Resetting the control box and using
diagnostics . . . . . . . . . . . . . . . . . . . . . . . 9
5. MAINTENANCE . . . . . . . . . . . . . . . . . . . 10
6. FAULTS / SOLUTIONS . . . . . . . . . . . . . 11
1– Air damper actuator
2– Air dampers
3– 7 pole socket for electrical supply
and control
4– 6 pole socket for gas train
5– Cable grommet
6– Screw for fixing the cover
7– Air pressure switch
8– Control box
9– Reset button with lock-out lamp
CE marking according to Gas Appliance Directive 90/396/EEC; PIN 0063AP6680.
According to Directives: EMC 89/336/EEC, Low Voltage 73/23/EEC and Efficiency 92/42/EEC.
The burner is approved for intermittent operation as per Directive EN 676.
The burner meets protection level of IP X0D (IP 40), EN 60529.
Gas train according to EN 676.
NOTE
The cable grommet (5) and the screw for fixing the cover (6) supplied with the burner, must be fitted to the
same side of the gas train.
Fig. 1
D4185
6 5 3
2
19
8
7
4

2728 2GB
2. TECHNICAL DATA
2.1 TECHNICAL DATA
For gas family 3 (LPG) ask for separate kit.
2.2 OVERALL DIMENSIONS
2.3 WORKING FIELD (as EN 676)
Thermal power (1) 81 – 220 kW - 70,000 – 189,000 kcal/h
Natural gas (Family 2) Net heat value: 8 – 12 kWh/Nm3-7,000 – 10,340 kcal/Nm3
Pressure: min. 20 mbar - max. 100 mbar
Electrical supply Single phase, 230V ±10% ~50Hz
Motor 230V / 1.4A
Capacitor 5 µF
Ignition transformer Primary 230V / 1.8A - Secondary 8 kV / 30 mA
Absorbed electrical power 0.25 kW
(1) Reference conditions: Temp. 20°C - Barometric pressure 1013 mbar – Altitude 0 m above sea level.
COUNTRY AT DE ES - GB-IE LU NL
GAS CATEGORY II2H3B/P II2ELL3B/P II2H3P II2E3B/P II2L3B/P
FlangeBurner
350 120 389 170
155
33 67
45°
45°
37
ø
125
298
11
170
Rp 3/4
230
152

280
Length available using a separate kit.
D4196
200
 379

Combustion head extension, supplied separately.
D5212
0
Thermal power
0.8
1.6
2.4
3.2
4.0
4.8
70,000 90,000 110,000 130,000 kcal/h
80 120100 140 160 kW180
170,000
200 220
150,000 190,000
Pressure in the combustion
chamber – mbar

2728 3GB
TEST BOILER
The working field has been defined according to EN 676 standard.
COMMERCIAL BOILERS
The burner-boiler matching is assured if the boiler conforms to EN 303 and the combustion chamber dimen-
sions are similar to those shown in the diagram EN 676. For applications where the boiler does not conform to
EN 303, or where the combustion chamber is much smaller than the dimensions given in EN 676, please con-
sult the manufacturers.
CORRELATION BETWEEN GAS PRESSURE AND BURNER OUTPUT
To obtain the maximum output, a gas head pressure of 6.9 mbar is measured (M2, see chapter 3.3, page 4) with
the combustion chamber at 0 mbar using gas G20 with a net heat value of 10 kWh/Nm3(8,570 kcal/Nm3).
3. INSTALLATION
THE BURNER MUST BE INSTALLED IN CONFORMITY WITH LEGISLATION AND LOCAL STANDARDS.
3.1 BOILER FIXING
3
D5213
4
5
6
7
8
Thermal power
70,000 90,000 110,000 130,000 kcal/h
80 120100 140 160 kW180
170,000
200 220
150,000 190,000
Gas pressure in the
combustion head – mbar
Boiler door must have a max. thickness of 100 mm,
refractory lining included.
If thickness is greater (max. 260 mm), a combustion
head extension must be fitted, which is supplied
separately.
IMPORTANT Separate the combustion-head assembly
from the burner body by removing nut (1) and
removing group (A).
Fix the head assembly group (B) to the boiler
(2) insert the supplied insulating gasket (3).
HINGE
S7393
ASSEMBLY
132
AB
D5096

2728 4GB
3.2 PROBE - ELECTRODE POSITIONING
3.3 GAS FEEDING LINE
GAS TRAIN ACCORDING TO EN 676
The gas train is supplied separately, for its adjustment see the enclosed instructions.
GAS TRAIN CONNECTIONS USE
TYPE CODE INLET OUTLET
MBDLE 407 B01 3970531 Rp 3/4 Rp 3/4 Natural gas ≤80 kW and LPG
MBDLE 410 B01 3970532 Rp 1 Rp 3/4 Natural gas and LPG
D5104
Ignition electrode
WARNING
2 – 3 mm
Ionization probe
Probe
Electrode
3,7
~
47 mm
Diffuser
=
=
1– Gas supply pipe
2– Manual cock (supplied by the installer)
3– Gas pressure gauge (supplied by the installer)
4– Filter
5– Gas pressure switch
6– Safety valve
7– Pressure governor
8– Adjustment valve
M1 – Gas-supply pressure test point
M2 – Pressure coupling test point
1
D4197 M2
2 3 M1 4 5 6 7 8

2728 5GB
3.4 ELECTRICAL WIRING
Ionization probe
Electrode
Motor
Capacitor
Burner earth
Air pressure
Blue
White
Black
Control box
RMG 88.620A2
Suppressor
Connector
Ignition transformer
3.4.1 STANDARD ELECTRICAL WIRING
KEY TO LAY-OUT
XP6– 6 pole socket
XP7– 7 pole socket
X6 – 6 pin plug
X7 – 7 pin plug
B4 – Working signal
h1 – Hour counter
PG – Minimum gas pres-
sure switch
S3 – Remote lock-out
signal
(230V - 0.5 A max.)
T6A – Fuse
TL – Limit thermostat
TS – Safety thermostat
V10 – Safety valve
V11 – Adjustment valve
Air damper actuator
Blue
Black
Brown
In the case of phase-
phase feed, a bridge
must be fitted on the
control box terminal
board between terminal
6 and the earth terminal.
ATTENTION
TO BE DONE BY
THE INSTALLER
CARRIED-OUT
IN THE FACTORY
230V ~50Hz
D4198
switch
ATTENTION:
Do not swap neutral and phase over, follow the diagram shown carefully and carry out a good earth connection.
The section of the conductors must be at least 1mm². (Unless requested otherwise by local standards and legislation).
The electrical wiring carried out by the installer must be in compliance with the rules in force in the country.
Verify that the burner stops by operating the boiler control thermostats and that the burner locks out by separating
the red ionisation probe lead connector.
NOTES
The burners have been type-approved for intermittent operation. This means they must stop at least once every 24 hours in
order to allow the electrical control box to check its efficiency on start-up. The boiler limit thermostat (TL) normally ensures
the burner halts. If this does not happen a time switch halting the burner at least once every 24 hours must be applied in se-
ries to limit thermostat (TL).

2728 6GB
3.4.2 ELECTRICAL WIRING WITH GAS LEAK CONTROL DEVICE (DUNGS VPS 504)
4. WORKING
4.1 COMBUSTION ADJUSTMENT
In conformity with Efficiency Directive 92/42/EEC the applica-
tion of the burner on the boiler, adjustment and testing must be
carried out observing the instruction manual of the boiler,
including verification of the CO and CO2concentration in the
flue gases, their temperatures and the average temperature of
the water in the boiler.
To suit the required appliance output, choose the proper set-
ting of the combustion head, and the air damper opening.
4.2 COMBUSTION HEAD SETTING
Loose the screw (A), move the elbow (B) so that the rear
plate of the coupling (C) coincides with the set point.
Tighten the screw (A).
Example:
The burner is installed on a 155 kW
boiler with an efficiency of 90%, the
burner input is about 172 kW using the
diagram, the combustion set point is 3.
The diagram is to be used only for initial
settings, to improve air pressure switch
operation or improve combustion, it
may be necessary to reduce this setting
(set point toward position 0).
KEY TO LAY-OUT
X6 – 6 pin plug
X7 – 7 pin plug
B4 – Working signal
h1 – Hour counter
PG – Minimum gas pressure
switch
S3 – Remote lock-out signal
(230V - 0.5 A max.)
T6A– Fuse
TL – Limit thermostat
TS – Safety thermostat
V10 – Safety valve
V11 – Adjustment valve
230V ~ 50Hz
D4199
TO BE DONE BY
THE INSTALLER
S7015
C
A
B
kcal/h kW
Set point
02134
240
140
120
100
80
160
200,000
140,000
120,000
100,000
70,000
D5109
5
180
200
220
80,000
160,000
180,000
172

2728 7GB
4.3 AIR DAMPER SETTING
The air damper (1) is operated by the actuator (2) and assures that
the air damper is fully open before the burner start cycle begins .
The regulation of the air-rate is made by adjusting the fixed air
damper (3), after loosing the screws (4).
When the optimal regulation is reached, screw tight the screws
(4) to assure a free movement of the mobile air damper (1).
4.4 COMBUSTION CHECK
It is advisable to set the burner according to the type of gas used and following the indications of the table:
IONIZATION CURRENT
The minimum current necessary for the control box operation is 3 µA.
The burner normally supplies a higher current value, so that no check is needed. However, if you want to meas-
ure the ionization current, you must open the connector fitted to the red wire and insert a microammeter.
4.5 AIR PRESSURE SWITCH
The air pressure switch is set after all other adjustments have been made. Begin with the switch at the low-
est setting. With the burner working at the minimum output, adjust the dial clockwise, increasing its value
until the burner shuts down. Now reduce the value by one set point, turning the dial anti-clockwise.
Check for reliable burner operation, if the burner shuts down, reduce the value by a half set point.
Attention:
To comply with the EN 676 standard, the air pressure switch must operate when the CO value exceeds 1%
(10,000 ppm).
To check this, insert a combustion analyser in the flue, slowly reduce the burner air setting and verify that
the burner shuts down by the action of the air pressure switch before the CO value exceeds 1%.
EN 676 AIR EXCESS:
max. output λ≤1.2 – min. output λ≤1.3
GAS Theoretical max. CO2
0 % O2
Setting CO2% CO
mg/kWh NOx
mg/kWh
λ= 1.2 λ= 1.3
G 20 11.7 9.7 9.0 ≤100 ≤170
G 25 11.5 9.5 8.8 ≤100 ≤170
G 30 14.0 11.6 10.7 ≤100 ≤230
G 31 13.7 11.4 10.5 ≤100 ≤230
D5036
4
1
2
3
4
Probe
Connector
Terminal board
of control-box
D5006
10

2728 8GB
4.6 BURNER START-UP CYCLE
When flame-failure occurs during working, shut down takes place within one second.
4.7 START-UP CYCLE DIAGNOSTICS
During start-up, indication is according to the followin table:
COLOUR CODE TABLE
Sequences Colour code
Pre-purging           
Ignition phase           
Operation, flame ok            
Operating with weak flame signal.          
Electrical supply lower than ~170V           
Lock-out          
Extraneous light           
Index: Off  Yellow Green Red
3s40s40smax. 2s max. 2s
D4172
Lock-out, due to ignition failureNormal
Thermostat
Motor
Ignition transformer
Valves
Flame
Lock-out