Riello GAS 7 P/M Quick start guide

Installation, use and maintenance instructions
2915245 (5) - 05/2018
Forced draught gas burner
Progressive two-stage or modulating operation
CODE MODEL TYPE
3753781 GAS 7 P/M 537 T80
GB

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 7 P/M
These products are in compliance with the following Technical Standards:
EN 676
EN 12100
and according to the European Directives:
MD 2006/42/EC Machine Directive
LVD 2014/35/UE Low Voltage Directive
EMC 2014/30/UE Electromagnetic Compatibility
The quality is guaranteed by a quality and management system certified in accordance with UNI EN ISO 9001.
Mr. U. Ferretti Mr. F. Comencini

1 2915245
GB
TECHNICAL DATA
ELECTRICAL DATA
BURNER DESCRIPTION
BURNER EQUIPMENT
Thermal power 400 - 1760 kW - 344.000 - 1.513.600 kcal/h
Operation • Two stages progressive
• Modulating (kit with controller available upon request)
Fuel Natural gas Pci 8 - 10 kWh/m3= 7000 - 8600 kcal/m3
Minimum gas pressure For maximum output 14.5 mbar are needed measured at the coupling with nil pressure in the combustion chamber and gas with calorific value of 8600 kcal/
m3
Maximum gas pressure 150 mbar
Electrical supply Three-phase 220V +10% -10% ~ 60Hz without neutral
380V +10% -10% ~ 60Hz with neutral
Motor 10A / 230V - 5.8A / 400V
Ignition transformer Primary: 1.8A / 220V - Secondary: 1 x 8 kV - 30 mA
Absorbed electrical power 4.1 kW
Quantity Burner accessories
1 Flange
1Gasket
8Screws
1 Flange gasket
1 Servomotor controlling air and gas
2 Adjustment cam
3 Power controller (for modulating to be required
separately)
4 Control box re-set button
5 Servomotor connection
6 Fair leads
7 Wiring terminal block
8 Re-set push-button of the motor overload relay
9 Air pressure switch
10 Gas pressure test-point
Fig. 1
D2206

2915245 2
GB
MAXIMUM DIMENSIONS
COMBUSTION CHAMBER PRESSURE - MAXIMUM OUTPUT
(in compliance with DIN 4788)
Min. output: 400 kW - 344.000 kcal/h.
Boiler front-plate
drilling
*Length available with special blast tube to be separately required.
Burner
230
230
230 M12
D1785
D2201
D2202

3 2915245
GB
MINIMUM GAS PRESSURE - OUTPUT
Pressure: detected at the pressure test-point 10) (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 1250 kW it is necessary a gas pressure of 12 mbar and the combustion head set as indicated
at page 8.
If the combustion chamber is pressurized at 2 mbar, the pressure detected at the test-point 9) is: 12 +
2 = 14 mbar.
If this value is too high, for very low gas pipework pressures, the gas gear 6) (page 8) 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.
CORRELATION BETWEEN GAS PRESSURE AND BURNER OUTPUT
D2203

2915245 4
GB
FIXING TO THE BOILER
GAS SUPPLY
1 - Gas pipe line
2 - Cock valve
3 - Filter
4 - Pressure stabilizer
5 - Pressure test-point
6 - Minimal gas pressure switch
7 - Safety valve
8 - Adjustment valve
9 - Adjusting throttle valve
10 - Burner
11 - Gas leak control device
Separate the blast tube from the burner body
by loosening the screws 7) and 3), fix the
blast tube to the boiler front plate 5) using the
gasket 6) provided.
Insert the burner on the holding bars 4) and
fasten the screws 7) and 3).
The combustion head adjustment should be
carried out as follows:
Loosen the screws 2) unhook the tension
rod of the air damper 1) remove the
connecting lead of the servomotor, withdraw
the group A) from the group B).
After the setting, re-assemble and verify that
the tension rod of the air damper was locked.
D2178
D2179
Supplied
upon request To be carried out by the installer

5 2915245
GB
BURNER ELECTRICAL WIRING
(carried out y the factory)
Key to layout
CMV Motor contactor
LFL... Control box
MB Burner terminal strip
MV Fan motor
PA Air pressure switch
RT Thermal cut-out
SM Servomotor
SO Ionisation probe
SP Plug-socket
TA Ignition transformer
TB Burner ground
20152071

2915245 6
GB
ELECTRICAL CONNECTIONS TO THE WIRING TERMINAL BLOCK
(to be carried out by the installer)
NOTICE
- The electric wiring carried out by the installer must be in compliance with the rules in force in the Country.
- Leads minimal section 1 mm2.
- Adjustment for the motor thermal relay:
• at the beginning of the scale for 380 V;
• at the end of the scale for 220 V.
- Burners with non-stop operation.
For safety reasons, this type of burner must be stopped every 24 hours of operation, by means of an hours-
counter to be connected in series with the adjustment devices.
Key to layout
BP - Pressure probe
BT - Temperature probe
MB - Burner terminal strip
PC - Check pressure switch
PG - Min. gas pressure switch
RWF50 - Power controller
TR - High-low mode load remote control sys-
tem: controls operating stages 1 and 2
TL - Load limit remote control system: shuts
down the burner when the boiler temper-
ature or pressure reaches the preset
value.
TS - Safety load control system: operates
when TL is faulty
VR - Adjustment valve
VS - Safety valve
20152143

7 2915245
GB
FIXING OF THE ELECTRICAL WIRES
All the electrical wires, which are to be connected to the terminal block 7) (fig. 1) shall pass through the fair
leads 6) (fig. 1) as per this scheme.
1- Three phase supply : fair lead Pg 21
2- Single phase supply : fair lead Pg 13.5
3- Adjustment thermostat : fair lead Pg 13.5
4- Safety thermostat : fair lead Pg 13.5
5- Gas train : fair lead Pg 13.5, sheath ø 13
6-2nd stage thermostat : fair lead Pg 13.5 (probe for modulating version)
7- Pre-sheared holes : fair lead Pg 13.5 (for power controller - modulating version)
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.
D2184

2915245 8
GB
BURNER START-UP CYCLE
Air-purge: loosen the screw placed on the minimal gas pressure switch mounted on the gas train.
AIR PRESSURE SWITCH
The air pressure switch setting shall be carried out after having set all other
adjustments of the burner and the air pressure switch shall be at its lowest
set-point.
When the burner is operating, increase the adjustment pressure by turning
- slowly - clockwise the knob till reaching the burner lock-out.
Thereafter, turn the knob anticlockwise for 1 mbar and repeat the burner
start-up for checking the regularity: if lock-out intervenes turn the knob an-
ticlockwise for 0.5 mbar.
CAUTION:
do not turn the ionization probe, maintain the drawing position; should it be close to the ignition electrode, damage
may occur to the control box amplifier.
Screw
Plug for pressure measure
Pressure switch
S7506
1 ÷ 10
mbar
Adjustment knob
S7507
D2206