Riello GAS 3 Quick start guide

Installation, use and maintenance instructions
2915858 (3) - 03/2014
Forced draught gas burners
Code Model Type
3751960 GAS 3 519T55
3751961 GAS 3 519T55

5858
1
DECLARATION
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: GAS 3
These products are in compliance with the following Technical Standards:
EN 676
EN 292
and according to the European Directives:
MD 2006/42/EC Machine Directive
LVD 2006/95/EC Low Voltage Directive
EMC 2004/108/EC Electromagnetic Compatibility
The quality is guaranteed by a quality and management system certified in accordance with UNI EN ISO
9001.
Legnago, 10.10.2013 Executive Director
RIELLO S.p.A. - Burner Department
Mr. G. Conticini
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. R. Cattaneo

5858 2
TECHNICAL DATA
BURNER DESCRIPTION
STANDARD EQUIPMENT
OVERALL DIMENSIONS
Thermal output 150 ÷ 350 kW - 130,000 ÷ 300,000 kcal/h
Fuel Natural gas Pci 8 - 10 kWh/m3= 7000 - 8600 kcal/m3
Minimum gas pressure For maximum output 11.1 mbar are needed measured at the coupling with nil pressure in the combustion chamber and gas with calorific val-
ue of 8600 kcal/m3
Maximum gas pressure 35 mbar
Electrical supply Single phase 230 V ±10% ~ 50Hz
Motor 2 A / 230 V
Capacitor 450V - 6.3µF
Ignition transformer Primary: 2A/230V - Secondary: 1 x 9 kV - 33 mA
Absorbed electrical power 0.4 kW
Quantity Description
1 Flange
1 Gasket
8Screws
1 Flange gasket
Fig. 1
1- Air shutter control
2- Air shutter lock-out
3- Control box reset button
4- Fair leads
5- Wiring terminal block
6- Over pressure switch (2)
7- Air pressure switch (1)
8- Gas pressure test-point
* Long combustion head.

5858
3
COMBUSTION CHAMBER PRESSURE - OUTPUT
MINIMUM GAS PRESSURE - OUTPUT
Pressure: Detected at the pressure test-point 8) (fig. 1) with nil mbar into the combustion chamber.
Should the combustion chamber be pressurized, the pressure necessary will be that of the graph
plus the pressurization value.
Example: To obtain 270 kW it is necessary a gas pressure of 8 mbar and the combustion head set as
indicated at page 9. If the combustion chamber is pressurized at 2 mbar, the pressure detected at
the test-point 8) is: 8 + 2 = 10 mbar.
If this value is too high, for very low gas pipework pressures, the gas gear 6) (page 9) could be more
open. Do not decrease the pressure at the coupling under the values shown in the diagram.
Output: The maximum value is obtainable with gas Pci 8600 kcal/m3.

5858 4
FIXING TO THE BOILER
Separate the combustion head from the
burner body by loosening the screws 1)
and 2) and withdrawing the group A) from
the holding bars 3). Fix the group B) to the
boiler front plate 4) using the gasket 5) pro-
vided as accessory.
GAS DISTRIBUTORS
GAS SUPPLY
Please refer to Appliance Technical Instruction for Gas train details.
LPG DISTRIBUTOR
NATURAL GAS DISTRIBUTOR

5858
5
BURNER ELECTRICAL WIRING
(carried out by the factory)
KEY TO LAYOUT
P1 Air pressure switch
P2 Over pressure switch
CCapacitor
F1 RFI Suppressor
K1 Relay
MB Burner terminal strip
MV Fan motor
RMG Control box
SO Ionisation probe
TA Ignition transformer
TB Burner earth
ATTENTION
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.
WIRING TERMINAL STRIP (SEE PAG. 6)
2565

5858 6
ELECTRICAL CONNECTIONS TO THE WIRING TERMINAL STRIP
(to be carried out by the installer)
Warning
Connect gas valves to terminals 10-11-12 only, exactly as shown on the diagram.
KEY TO LAYOUT
MB Terminal strip
CPI Valve position switch
HRemote lock out signal
TB Burner earth
TL Limit load control system
TS Safety load control system
VA Ignition valve
VR Adjusment valve
VS Safety valve
2566

5858
7
FIXING OF THE ELECTRICAL WIRES
All the electrical wires, which are to be connected to the terminal block 5) (fig. 1) shall pass through the fair
leads 4) (fig. 1) as for this scheme.
1- Single phase supply: fair lead Pg 13.5
2- Adjustment thermostat: fair lead Pg 13.5
3- Safety thermostat: fair lead Pg 13.5
4 - 5 - 6 - 7 - 8 - Pre-sheared holes
Further prospective signals or controls can be connected to the burner wiring terminal board by removing the
metal weldnuts from the pre-sheared holes and inserting a commun fair lead for the passage and the clamping
of the leads.
NOTES
-Do not exchange the neutral wire with the phase (avoid the plug-pin connection).
- Carry out a safe earth connection.
- Check the stop of the burner, by opening the boiler thermostat and the burner lock-out, by disconnecting the
lead from the flame probe.
WARNING
When closing the burner on its slide-bars, pull towards the outside the high voltage cable and the cable of the
flame detection probe, till to little tension.

5858 8
START-UP
For Gas train settings, please refer to Appliance Technical Instructions.
AIR PRESSURE SWITCH “1”
The air pressure switch is set after adjustment have been made. Begin with the switch at the lowest setting. With
the burner working at the minimum output, adjust the dial clockwise, increasing its value until the burner locks
out. Now reduce the value by one set point, turning the dial anti-clockwise.
Check for reliable burner operation. If the burner locks out, reduce the value by a further set point.
OVER PRESSURE SWITCH “2”
The over pressure switch must be set after all other adjustments have been made. its purpose is to cause the
burner to shut down if the combustion chamber pressure increases above normal operational values.
Begin with the switch at the highest setting, with the burner working at the maximum output, adjust the dial anti-
clockwise, decreasing its value until the burner shuts down. Now increase the value by one set point and re-start
the burner. If the burner shuts down due to the pressure surge in the combustion chamber caused by the ignition
gas, check that the start gas rate is less than 25% of the main gas rate. If it is, increase the value on the over
pressure switch by a further half a set point and repeat the test.
NOTE
To comply with the Appliance Standard PREN 1020, the CO value must not exceed 0.1% under normal opera-
tional conditions.
CAUTION
Do not turn the ionization probe, maintain the drawing position; should it be close to the ignition electrode, dam-
age may occur to the control box amplifier.
The right positions of the ionisation probe and of the ignition electrode (as shown in the drawing) is obtainable
by coinciding their insulators planes with sloping planes of the fastening support.
Probe position Ignition electrode position