Riello G 24 Quick start guide

2915388 (5) - 10/2013
Installation, use and maintenance instructions
Light oil burner
Two-stage operation
G 24
CODE MODEL TYPE
3473000 G 24 651 M
GB

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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: Light oil burner
Model: G 24
These products are in compliance with the following Technical Standards:
EN 267
EN 12100
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, 19.11.2012 Executive Director
RIELLO S.p.A. - Burner Department
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. I. Zinna Mr. R. Cattaneo

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CONTENTS
1. BURNER DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Standard equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Firing rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. HYDRAULIC SYSTEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Electrical system factory-set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Electrical connection to the terminal strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. BURNER ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1 Combustion head adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.2 Air damper adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.3 Positioning of electrodes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. PRIMING THE PUMP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. BURNER START-UP CYCLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1. BURNER DESCRIPTION
1 - Suction line fitting
2 - Return line fitting
3 - Suction gauge fixing point (G 1/8)
4 - Pressure gauge fixing point (G 1/8)
5 - Pump pressure adjuster
6 - Wiring terminal block
7 - Fairleads
8 - Control box reset-button with signal of
lock-out
9 - Combustion head control shaft
10 - Photoresistance
11 - Flange with thermal insulation screen
12 - Air damper
13 - Screw for fixing air damper and as point of
reference for its adjustment
1.1 STANDARD EQUIPMENT
Flexibles oil-lines with nipples and gaskets . N° 2
Flange with thermal insulation screen. . . N° 1
Screws and nuts for flange . . . . . . . . . . . N° 4
Nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . N° 2
Screws with two nuts for flange. . . . . . . . N° 1
Hinge. . . . . . . . . . . . . . . . . . . . . . . . . . . . N° 1
Fig. 1

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2. TECHNICAL DATA
2.1 DIMENSIONS
2.2 FIRING RATE
MODEL G 24
TYPE 651 M
THERMAL POWER 140 ÷ 237 kW / 120.000 ÷ 240.000 kcal/h
OUTPUT 12 ÷ 24 kg/h
FUEL Gas oil, max. viscosity at 20 °C: 6 mm2/s (1.5 °E)
ELECTRICAL SUPPLY single-phase 220 V +10% -15% ~ 50 Hz
MOTOR 1.85 A / 220 V
CAPACITOR 8 F / 450 V
IGNITION TRANSFORMER Primary 1.6 A / 220 V - sec. 30 mA / 1x8 kV
ABSORBED ELECTRICAL POWER 0.4 kW
WEIGHT 21.6 kg
ELECTRICAL PROTECTION IP 40
Burner
Flange
* with long combustion head kit
OUTPUT - PRESSURE IN THE COMBUSTION CHAMBER

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3. HYDRAULIC SYSTEMS
GRAVITY FEED from the bottom of the oil storage tank
GRAVITY FEED over the top of the oil storage tank
SUCTION FEED
H= Difference in height;
L= Total lenght of the suction line, including the vertical section;
The copper pipes of 8 mm and 10 mm I.D., as shown on the tables above, may be replaced by steel pipes of 1/4” or 3/8” Gas.
The dimension P should not exceed 10 m, to
avoid breakage of pump seals.
H
meters
L meters
øi øi
8 mm 10 mm
0.5 5 10
110 20
1.5 15 30
220 40
The dimension P should not exceed 10 m, to
avoid breakage of pump seals.
H
meters
L meters
øi øi
8 mm 10 mm
032 70
0.5 28 62
124 55
1.5 20 48
216 40
37 25
3.5 - 10
H
meters
L meters
øi øi
8 mm 10 mm
032 70
0.5 28 62
124 55
1.5 20 48
216 40
37 25
3.5 - 10
Oil lines must be perfectly
sealed. The use of cop-
per pipe is therefore rec-
ommended.
The pump suction must
not exceed 4 m w.c. (30
cm Hg) because beyond
this value the pump
becomes noisy.
The return line must ter-
minate at the same level
as the foot valve; other-
wise the pump may
become air-locked.

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4. ELECTRICAL SYSTEM
4.1 ELECTRICAL SYSTEM FACTORY-SET
KEY TO LAYOUT
C- Capacitor
FR - Photoresistance
MB - Burner terminal strip
MV - Motor
TA - Ignition transformer
TB - Burner ground (earth)
connection
V1 - 1st stage solenoid
valve
V2 - 2nd stage solenoid
valve
4.2 ELECTRICAL CONNECTION TO THE TERMINAL STRIP
(installer-set)
NOTE
- Do not exchange the neutral wire with the phase (avoid the
plung-pin connection).
- Carry out a safe earth connection.
- Cable section not indicated: 1 mm2.
- All the electrical wires, which are to be connected to the termi-
nal block shall pass through the fair leads 7 (Fig. 1) to guaran-
tee the electrical protection IP 40.
- Verify the burner stop by opening the boiler thermostat and
the burner lock-out by darkening the photoresistance.
- The burner has been type approved for intermittent operation.
This means it should compulsorily be stopped at least once
every 24 hours to enable the control box to perform checks of
its own efficiency at start-up.
Burner halts are normally provided for automatically by the
boiler load control system.
If this is not the case, a time switch should be fitted in series
to TL to provide for burner shut-down at least once every 24
hours.
(A)
S8981
BLUE BROWN BLACK
KEY TO LAYOUT
MB - Burner terminal strip
S- Remote lock-out signal
TB - Burner ground (earth) connection
TL - Limit control device system
TS - Safety control device system
S8982

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5. BURNER ADJUSTMENT
Establish, on the basis of the output desired, and in accordance with the table and the diagram underneath:
- the type of nozzle;
- the pump pressure;
- the combustion head setting.
EXAMPLE
The burner has to be matched with a boiler of 220 kW.
Assuming an efficiency of 90%, we need to develop approximately 245 kW i.e. burning reughly 21 kg/h.
Starting from 21 kg/h in the delivery column, we find in the other columns the nozzle necessary (two 2.50 GPH - or
one 3.00 GPH and one 2.00 GPH - with 60° atomisation angle), the pump pressure (12 bar), and the position of the
combustion head (notch 5).
(1) The indicated outputs are drawn from the average statistical data of our tests. Real output may well vary by
+10%.
(2) Nozzles of the major existing makers may be used.
It might well be possible however, that for certain specific outputs, one type of nozzle is less suitable than others.
It is recommended not to change the atomizing angle.
(3) The pressure is adjusted by turning screw 5 (Fig. 1) on the pump; it is monitored by installing a pressure gauge
on connection 4 (Fig. 1).
The measurement indicated (12 bar) can be varied by +2 bar (e.g. to adjust the delivery); a pressure of 14 bar
for low temperature firing is advised.
(4) See below.
5.1 COMBUSTION HEAD ADJUSTMENT
This is effected when the nozzle is fitted, with the blast tube disassembled.
The adjustment depends on the required delivery to the burner and it is done by turning adjustment bar 9 (fig. 1)
untill the edge of the blast tube is aligned with the notch indicated by the table on this page (see above).
In figure 3, for example, head is set for a delivery 3.50 GPH at 12
bar; notch 3 on the indicator in fact coincides with the edge of blast
tube.
Head adjustments shown on the table on the previous page are
correct in the majority of cases; adapting the fan delivery to the
burner is normally done only with the air gate valve.
If revision of the head adjustment is required, remember that by
turning the adjustment bar clockwise the air delivery is increased.
By turning the adjustment bar anti-clockwise the air delivery is
reduced.
Do not under any circumstances move the head adjustment more
than one notch either side of the measurement obtained from the
table.
The burner leaves the factory with the head set at notch 4.
Burner delivery (1)
kg/h +10%
Nozzle (2) Pump pressure (3)
bar
Combustion head
setting (4)
Notch
GPH Angle
12 1.50 + 1.50
1.75 + 1.25 60° 12 1
15 1.75 + 1.75
2.00 + 1.50 60° 12 2
17 2.00 + 2.00
2.25 + 1.75 60° 12 3
19 2.25 + 2.25
2.50 + 2.00 60° 12 4
21 2.50 + 2.50
3.00 + 2.00 60° 12 5
24 3.00 + 3.00
3.50 + 2.50 60° 12 6
Fig. 3

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5.2 AIR DAMPER ADJUSTMENT
Adjusting the air delivery effected on the air damper 1 (Fig. 4) after loosening screws 2 and 3.
Once the air damper has been adjusted, tighten 2 and 3 fully down.
5.3 POSITIONING OF ELECTRODES
Make sure that the electrodes are positioned as shown in Fig. 5.
Fig. 4
Fig. 5

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6. PRIMING THE PUMP
In case of a gravity feed system, from the bottom of the oil-storage tank (see page 4), loosen the screw of the
suction-gauge fixing point 3 (Fig. 1), until the fuel flows out.
In the other two cases, start the burner and bleed the air from the pressure gauge connection by loosening
plug 4 (Fig. 1).
Do not illuminate the photoresistance as this would cause an immediate lock-out.
If, during these operations, the burner locks out, reset it and repeat the cycle as many times as necessary.
CAUTION!
Check, before starting the burner, that the return line to the oil-storage tank is not in any way obstructed.
Any obstruction would cause the breakage of the pump seals.
7. BURNER START-UP CYCLE
NORMAL LOCK-OUT BECAUSE NO IGNITION
THERMOSTAT
MOTOR
IGNITION TRANSFORMER
1st VALVE
2
nd
VALVE
LOCK-OUT LAMP

Subject to modifications
RIELLO S.p.A.
I-37045 Legnago (VR)
Tel.: [phone]
http:// www.riello.it
http:// www.rielloburners.com