Riello G20S Quick start guide

2902406 (5) - 09/2014

Installation, use and maintenance instructions

Instrucciones de instalación, montaje y funcionamiento

Light oil burner

Quemador de gasóleo

One stage operation

Funcionamiento de una llama

CODE - CÓDIGO MODEL - MODELO TYPE - TIPO

3748259 G20S 482 T58

2406

ENGLISH

TECHNICAL DATA

■

Burner with CE marking in conformity with EEC Directives: Machine Directive 2006/42/EC, Low Voltage

Directive 2006/95/EC, Electromagnetic Compatibility 2004/108/EC and Efficiency 92/42/EEC.

■

The burner meets protection level of IP 40, EN 60529.

TYPE 482T58

Thermal power – output 95 – 240 kW - 8 – 20 kg/h

Fuel Light oil, viscosity 4 – 6 mm

/s at 20 °C

Electrical supply Single phase, 220V

10%

60Hz

Motor Run current 2.2A – 3250 rpm – 340 rad/s

Capacitor 4 µF

Ignition transformer Secondary 8 kV – 16 mA

Pump Pressure 8 – 15 bar

Absorbed electrical power 0.41 kW

1– Return line

2– Suction line

3– Gauge connection

4– Pump pressure regulator

5– Vacuum gauge connection

6– Hydraulic jack with air-damper

7– Combustion head adjustment screw

8– Reset button with lock-out lamp

9– Flange with insulating gasket

10 – Start delaying device

D8077

Fig. 1

BURNER EQUIPMENT

Quantity Description

Flexible pipes with nipples

Flange with insulating gasket

Screws and nuts for flange

Maintenance assembly

Cable grommet

Screw with two nuts for flange

2406

WORKING FIELD

OVERALL DIMENSIONS

3.6

2.4

Pressure in the combustion

chamber – mbar

8 10 12 14 Fuel output - kg/h

90 120 240 Thermal power - kW

D5797

150 180 210

1.2

16 18 20

0.3

Flange Burner

350 118 295

160

45°

125

298

230

D5283

213

99 99

190

45°

2406

INSTALLATION

BOILER FIXING

• Put on the flange (1) the screw and two nuts, (see fig. 2).

• Widen, if necessary, the insulating gasket holes (5), (see fig. 3).

• Fix the flange (1) to the boiler door (4) using screws (2) and (if necessary) the nuts (3) interposing the

insulating gasket (5), (see fig. 4).

MAINTENANCE POSITION

Access to the combustion head, diffuser disc / electrodes unit and nozzle, (see fig. 5).

• Remove the burner out of the boiler, after loosing the fixing nut to the flange.

• Hook the burner to the flange (1), by removing the combustion head (6) after loosing the fixing screws (7).

• Remove the diffuser disc-holder assembly (9) from the nozzle-holder (8) after loosing its fixing screw.

• Screw the nozzle (10).

D5012

Fig. 2

Fig. 3

E9022

D8058

Fig. 4

Fig. 5

Fig. 6

Verify that the installed burner is lightly leaned towards the

button.

(See figure 6).

The burner is designed to allow entry of the flexible oil-lines

on either side of the burner.

D5572

D8056

D8057

2406

HYDRAULIC SYSTEMS

Warning: before starting the burner make sure that the return pipe-line is not clogged: any obstruc-

tion would cause the pump seals to break.

The pump vacuum should not exceed a

maximum of 0.4 bar (30 cm Hg).

Beyond this limit gas is released from

the oil.

Oil lines must be completely airtight.

The return line should terminate in

the oil tank at the same level as the

suction line; in this case a non-return

valve is not required.

When the return line arrives over the

fuel level, a non-return valve must be

used.

This solution however is less safe than

previous one, due to the possibility of

leakage of the valve.

PRIMING THE PUMP

Start the burner and wait for the priming.

Should lock-out occur prior to the arrival

of the fuel, await at least 20 seconds

before repeating the operation.

A filter must be installed on the suction fuel line.

meters

L meters

I. D.

8 mm I.D.

10 mm

0.5

1.5

100

WARNING

The pump is supplied for use with a two pipe system.

For use on a one pipe system, it is necessary to remove the by-pass

screw (A), (see figure).

meters

L meters

I. D.

8 mm I.D.

10 mm

0.5

1.5

3.5

100

H max. 4 m

max. 4 m

min. 0.1 m

D5219

D5220

D5199

Difference of level.

L= Max.

length of the

suction line.

I.D.=

Internal diameter of the

oil pipes.

PRIMING THE PUMP

Loosen the plug of the vacuum gauge (5, fig. 1) and

wait until the fuel flows out.

2406

ELECTRICAL WIRING

Brown

White (50V)

Blue

Motor

Capacitor

Limit thermostat

Neutral

Main switch

6A max.

Black

NOTES:

– Wires of min. 1 mm

section.

(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.

– To remove the control-box from the burner,

loosen screw (A) (see figure) and pull towards

the arrow.

– The photoresistance is fitted directly into the con-

trol-box (underneath the ignition-transformer) on

a plug-in support.

TESTING

Check the shut-down of the burner by opening

the thermostats.

220V

60Hz

N L

Safety thermostat

Remote lock-out signal

(220V - 0.5A max.)

1 2 3 4 5 6 7 8 9

Blue

Brown

Terminal board of

control-box 530SE

Valve

RUN OF THE ELECTRICAL CABLE

1- Cable grommet N- Neutral

2- Cable-clamp L- Phase

3- Terminal board - Burner-earth

ATTENTION

Do not connect burner’s grounding, to fail-

ure indicator terminal . This may result

the destroy of the control box.

D5228

Black

CARRIED-OUT IN THE FACTORY

WARNING

DO NOT EXCHANGE THE

NEUTRAL WITH THE PHASE.

S7333

2406

COMBUSTION ADJUSTMENT

In conformity with Efficiency Directive 92/42/EEC the application of the burner on the boiler, adjust-

ment and testing must be carried out observing the instruction manual of the boiler, including verifica-

tion of the CO and CO

concentration in the flue gases, their temperatures and the average

temperature of the water in the boiler.

To suit the required appliance output, fit the nozzle then adjust the pump pressure, the setting of the

combustion head and the air damper opening in accordance with the following schedule.

The values shown in the table are measured on a CEN boiler (as per EN 267).

They refer to 12.5% CO

at sea level and with light oil and room temperature of 20 °C.

NOZZLES RECOMMENDED:

Monarch type R - PLP ; Delavan type B - W

Steinen type S - SS ; Danfoss type S - B

Angle

: 60° -

In most cases. Particularly suited to avoid flame-detach-

ment during ignition.

For narrow and long combustion-chambers it is advisable

to use full cone nozzles (e.g. 60° B).

COMBUSTION HEAD SETTING

(See fig. 2 and 3)

This is done when fitting the nozzle, with

the blast tube removed. It depends on

the output of the burner and is carried

out by rotating the regulating rod, till the

terminal plane of the blast tube is level

with the set-point, as indicated in the

schedule.

In the sketch on the right, the combus-

tion head is set for an output of 3.50

GPH at 12 bar, while the shutter is level

with set-point 3.5, as required by the

above schedule.

Combustion head settings indicated in the schedule are valid for most cases.

The setting of the fan output according to the installation should normally be done only through the air

damper. Should one subsequently want to retouch also the setting of the combustion head, with the

burner running, operate on the rod (1) with a 6 mm spanner (2) as follows:

Nozzle

Pump

pressure Burner

output Comb. head

adjustment Air damper adjustment

Low-flame High-flame

GPH Angle bar kg/h ± 4% Set-point Set-point Set-point

2.00 60° 12 8.0 1 1.8 2.0

2.25 60° 12 9.0 1.5 2.1 2.5

2.50 60° 12 10.0 2 2.4 2.8

3.00 60° 12 12.0 2.5 2.8 3.2

3.50 60° 12 14.0 3.5 3.2 4.0

4.00 60° 12 16.1 4 3.6 5.0

4.50 60° 12 18.1 5 4.0 6.0

4.50 60° 14.5 19.9 6 4.5 7.0

Blast tube

Regulating rod

Shutter

Terminal plane of the blast tube

D5284

135

Fig. 2

2406

TURN TO THE RIGHT: (sign

)

In order to increase the volume of air entering the com-

bustion chamber and thus diminishing its pressure.

There is a reduction of CO

and the adhesion of the

flame to the air diffuser disc improves. (Setting advisa-

ble for ignitions at low temperatures).

TURN TO THE LEFT: (sign

–

)

In order to reduce the volume of air entering the com-

bustion chamber and thus increasing its pressure.

The CO

improves and the adhesion of the flame to the

diffuser tends to reduce. (This setting is not advisable

for ignitions at low temperatures).

In any case do not bring the combustion head setting

more than one point away from that indicated in the

schedule. One set-point corresponds to 3 turns of the

rod; a hole (3) at its end facilitates counting the number

of turns.

PUMP-PRESSURE AND AIR-FLOW

(See fig. 4 and 5)

The burner, in order to guarantee good smooth starts,

irrespective of the type of boiler, is fitted with a hydrau-

lic device which, independently of the control-box,

reduces the fuel- and air-flow.

At ignition, the pressure at the nozzle is 9 bar.

After 4 - 6 seconds, it automatically increases to 12 bar.

The air-flow, initially adjusted to the low setting, is, at the

change-over of pressure, automatically brought to the

air-flow required for the big flame.

SETTING FOR THE LOW IGNITION-FLAME

Air-damper adjustment

Loosen the screw (1), by approximately one full turn; in

this way, the burner remains permanently on low flame.

Loosen the nut (2), turn the screw (3), in order to set

the air-damper (4) in the position required.

Then, lock the nut (2) and tighten the screw (1).

Reducer-adjustment

The pressure-reducer is factory set, at 9 bar.

The pressure-gauge should be mounted, in place of

plug (6). Should it be necessary to re-set or alter such

pressure, this can be done, by adjusting screw (5)

(always, after having loosened screw (1) ).

HIGH-FLAME SETTING

Air-damper adjustment

Loosen the nut (7), turn the screw (8), until the air-damper

(4) is in the required position. Then, lock the nut (7).

Pump-adjustment

The pump-pressure is pre-set, during production, at

12 bar. Should it become necessary to re-set or alter

such pressure, this can be done by turning screw (9).

S7334

S7743

2 3

D8068

Fig. 3

Fig. 4

Fig. 5

2406

AIR DAMPER ADJUSTMENT

The settings indicated in the schedule refer to the burner with its metal cover fitted and the combustion

chamber with “zero” depression. These regulations are purely indicative.

Each installation however, has its own unpredictable working conditions: actual nozzle output; positive

or negative pressure in the combustion-chamber, the need of excess air, etc. All these conditions may

require a different air-damper setting.

It is important to take account of the fact that the air output

of the fan differs according to whether the burner has its

metal cover fitted or not.

Therefore we recommended to proceed as follows:

– adjust the air damper as indicated in the schedule (3, page 6);

– mount the cover, simply by means of the upper screw;

– check smoke number;

– should it become necessary to modify the air output,

remove the cover by loosening the screw, adjust the air

damper, remount the cover and finally recheck the smoke

number.

Note: When the burner works at a firing rate higher than

18 kg/h remove the panel fitted inside the metal

cover. (See figure).

ELECTRODES ADJUSTMENTS

BURNER START-UP CYCLE

PANEL

S7335

Attention:

Before assembling or removing the noz-

zle, loosen the screw (A) and move the

electrodes ahead.

4±

0.3 mm

D6313

6.5

0.5 mm

MOVE THE ELEC-

TRODE HOLDER BACK-

WARDS TO THE END

Normal Lock-out, due to light-failure

12s

D5796

Thermostat

Motor

Ignition transformer

Valve

Ignition flame

Lock-out lamp

High flame

12s

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