Riello RL 70/M Quick start guide

2916050 (12) - 10/2021
Installation, use and maintenance instructions
Light oil burners
Low - High or modulating operation
CODE MODEL
C9514300 - C9514301 RL 70/M
C9515300 - C9515301 RL 100/M
C9516300 - C9516301 RL 130/M
GB

Original instructions

1 2916050
GB
Contents
1 Information and general instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Information about the instruction manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.2 General dangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.3 Other symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.4 Delivery of the system and the instruction manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Guarantee and responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Safety and prevention. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Personnel training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Technical description of the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Electrical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Burner models designations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Packaging - weight (Approximate measurements) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 Overall dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6 Standard equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Burner description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.8 Firing rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.8.1 Procedure to refer burner operating condition at an altitude and/or at a combustion supporter air temperature
different to the standard values (328 ft above sea level, 68 °F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.9 Minimum furnace dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.10 Control box for the air/fuel ratio (LAL2...) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Notes on safety for the installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Preliminary checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 Operating position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Preparing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5.1 Boring the boiler plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5.2 Length of the blast tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.6 Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.1 Combustion head calibration (RL 130/M). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7 Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.1 Recommended nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.2 Nozzle assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.3 Choice of nozzle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.4 Adjusting the nozzle flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8 Pressure controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.9 Electrode adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10 Combustion head setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.11 Hydraulic system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.11.1 Fuel supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.11.2 Hydraulic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.11.3 Hydraulic system layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.11.4 Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.11.5 Oil pressure switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.12 Electrical wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.12.1 Factory wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.12.2 Field wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.13 Thermal relay calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.13.1 Electro-mechanical thermal relay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.13.2 Electronic thermal relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.14 Motor connection at 208-230 or 460V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2916050 2
GB
Contents
4.15 Motor connection at 575V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.16 Reversible direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5 Start-up, calibration and operation of the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.1 Notes on safety for the first start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2 Burner calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.1 Combustion head setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.2 Nozzle adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.3 Electrode position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.4 Servomotor, cams I - II - III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3 Burner starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.1 Maximum output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.2 Minimum output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.3 Intermediate outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.4 Servomotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.4.1 Cams and trim potentiometers functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5 Final calibration of the pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5.1 Air pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.6 Burner operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.1 Burner starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.2 Steady state operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.3 Firing failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.4 Firing failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.7 Sequence of operation - LAL control box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.8 Final checks (with the burner working) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1 Notes on safety for the maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2 Maintenance programme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.1 Maintenance frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.2 Checking and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.3 Fuel pump and/or couplings replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3 Opening the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.4 Closing the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7 Faults - Probable causes - Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
A Appendix - Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
B Appendix - Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
C Appendix - Burner start up report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Information and general instructions
3 2916050
GB
1.1 Information about the instruction manual
1.1.1 Introduction
The instruction manual supplied with the burner:
is an integral and essential part of the product and must not be
separated from it; it must therefore be kept carefully for any
necessary consultation and must accompany the burner even
if it is transferred to another owner or user, or to another sys-
tem. If the manual is lost or damaged, another copy must be
requested from the Technical Assistance Service of the area;
is designed for use by qualified personnel;
offers important indications and instructions relating to the
installation safety, start-up, use and maintenance of the
burner.
Symbols used in the manual
In some parts of the manual you will see triangular DANGER signs.
Pay great attention to these, as they indicate a situation of potential
danger.
1.1.2 General dangers
The dangers can be of 3 levels, as indicated below.
1.1.3 Other symbols
Abbreviations used
Ch. Chapter
Fig. Figure
Page Page
Sec. Section
Tab. Table
1 Information and general instructions
DANGER
Maximum danger level!
This symbol indicates operations which, if not car-
ried out correctly, cause serious injury, death or
long-term health risks.
WARNING
This symbol indicates operations which, if not car-
ried out correctly, may cause serious injury, death
or long-term health risks.
CAUTION
This symbol indicates operations which, if not car-
ried out correctly, may cause damage to the ma-
chine and/or injury to people.
DANGER
DANGER: LIVE COMPONENTS
This symbol indicates operations which, if not car-
ried out correctly, lead to electric shocks with lethal
consequences.
DANGER: FLAMMABLE MATERIAL
This symbol indicates the presence of flammable
materials.
DANGER: BURNING
This symbol indicates the risks of burns due to high
temperatures.
DANGER: CRUSHING OF LIMBS
This symbol indicates the presence of moving parts:
danger of crushing of limbs.
WARNING: MOVING PARTS
This symbol indicates that you must keep limbs
away from moving mechanical parts; danger of
crushing.
DANGER: EXPLOSION
This symbol signals places where an explosive at-
mosphere may be present. An explosive atmos-
phere is defined as a mixture - under atmospheric
conditions - of air and flammable substances in the
form of gases, vapours, mist or dust in which, after
ignition has occurred, combustion spreads to the
entire unburned mixture.
PERSONAL PROTECTION EQUIPMENT
These symbols indicate the equipment that must be
worn and kept by the operator for protection against
threats against safety and/or health while at work.
OBLIGATION TO ASSEMBLE THE HOOD AND
ALL THE SAFETY AND PROTECTION DEVICES
This symbol signals the obligation to reassemble
the hood and all the safety and protection devices
of the burner after any maintenance, cleaning or
checking operations.
ENVIRONMENTAL PROTECTION
This symbol gives indications for the use of the ma-
chine with respect for the environment.
IMPORTANT INFORMATION
This symbol indicates important information that
you must bear in mind.
This symbol indicates a list.

2916050 4
GB
Information and general instructions
1.1.4 Delivery of the system and the instruction
manual
When the system is delivered, it is important that:
the instruction manual is delivered to the user by the system
manufacturer, with the recommendation to keep it in the room
where the heat generator is to be installed.
The instruction manual shows:
– the serial number of the burner;
– the address and telephone number of the nearest Assis-
tance Centre.
The system supplier must carefully inform the user about:
– the use of the system;
– any further tests that may be required before activating the
system;
– maintenance, and the need to have the system checked at
least once a year by a representative of the manufacturer or
another specialised technician.
To ensure a periodic check, the manufacturer recommends
the drawing up of a Maintenance Contract.
1.2 Guarantee and responsibility
The manufacturer guarantees its new products from the installation
date, in accordance with the regulations in force and/or the sales
contract. At the moment of the first start-up, check that the burner
is integral and complete.
In particular, the rights to the guarantee and the responsibility will
no longer be valid, in the event of damage to things or injury to peo-
ple, if such damage/injury was due to any of the following causes:
incorrect installation, start-up, use and maintenance of the
burner;
improper, incorrect or unreasonable use of the burner;
intervention of unqualified personnel;
carrying out of unauthorised modifications on the equipment;
use of the burner with safety devices that are faulty, incorrectly
applied and/or not working;
installation of untested supplementary components on the
burner;
powering of the burner with unsuitable fuels;
faults in the fuel supply system;
use of the burner even following an error and/or an irregularity;
repairs and/or overhauls incorrectly carried out;
modification of the combustion chamber with inserts that pre-
vent the regular development of the structurally established
flame;
insufficient and inappropriate surveillance and care of those
burner components most likely to be subject to wear and tear;
the use of non-original components, including spare parts,
kits, accessories and optional;
force majeure.
The manufacturer furthermore declines any and every respon-
sibility for the failure to observe the contents of this manual.
.........................................................................................
.........................................................................................
.........................................................................................
.........................................................................................
WARNING
Failure to observe the information given in this man-
ual, operating negligence, incorrect installation and
carrying out of non authorised modifications will re-
sult in the annulment by the manufacturer of the
guarantee that it supplies with the burner.

Safety and prevention
5 2916050
GB
2.1 Introduction
The burners have been designed and built in compliance with cur-
rent regulations and directives, applying the known technical rules
of safety and envisaging all the potential danger situations.
It is necessary, however, to bear in mind that the imprudent and
clumsy use of the equipment may lead to situations of death risk for
the user or third parties, as well as the damaging of the burner or
other items. Inattention, thoughtlessness and excessive confi-
dence often cause accidents; the same applies to tiredness and
sleepiness.
It is a good idea to remember the following:
The burner must only be used as expressly described. Any
other use should be considered improper and therefore dan-
gerous.
In particular:
it can be applied to boilers operating with water, steam, diathermic
oil, and to other uses expressly named by the manufacturer;
the type and pressure of the fuel, the voltage and frequency of the
electrical power supply, the minimum and maximum deliveries for
which the burner has been regulated, the pressurisation of the
combustion chamber, the dimensions of the combustion chamber
and the room temperature must all be within the values indicated in
the instruction manual.
Modification of the burner to alter its performance and destina-
tions is not allowed.
The burner must be used in exemplary technical safety condi-
tions. Any disturbances that could compromise safety must be
quickly eliminated.
Opening or tampering with the burner components is not
allowed, apart from the parts requiring maintenance.
Only those parts envisaged by the manufacturer can be
replaced.
2.2 Personnel training
The user is the person, body or company that has acquired the ma-
chine and intends to use it for the specific purpose. He is responsi-
ble for the machine and for the training of the people working
around it.
The user:
undertakes to entrust the machine exclusively to suitably
trained and qualified personnel;
undertakes to inform his personnel in a suitable way about the
application and observance of the safety instructions. With
that aim, he undertakes to ensure that everyone knows the
use and safety instructions for his own duties;
Personnel must observe all the danger and caution indications
shown on the machine.
Personnel must not carry out, on their own initiative, opera-
tions or interventions that are not within their province.
Personnel must inform their superiors of every problem or
dangerous situation that may arise.
The assembly of parts of other makes, or any modifications,
can alter the characteristics of the machine and hence com-
promise operating safety. The manufacturer therefore declines
any and every responsibility for any damage that may be
caused by the use of non-original parts.
In addition:
2 Safety and prevention
WARNING
The manufacturer guarantees safety and proper
functioning only if all burner components are intact
and positioned correctly.
the user must take all the measures necessary
to prevent unauthorised people gaining access
to the machine;
the user must inform the manufacturer if faults
or malfunctioning of the accident prevention
systems are noticed, along with any presumed
danger situation.
Personnel must always use the personal pro-
tective equipment envisaged by legislation and
follow the indications given in this manual.

2916050 6
GB
Technical description of the burner
3.1 Technical data
Tab. A
(1) Reference conditions: Ambient temperature 68 °F (20 °C) - Barometric pressure 394” WC - Altitude 329 ft a.s.l.
(2) Sound pressure measured in manufacturer’s combustion laboratory, with burner operating on test boiler and at maximum rated output.
(3) Equivalent Btu values based on 1 USGPH = 140,000 Btu/hr.
3.2 Electrical data
Fan and pump motor IE3 NEMA Premium Efficiency
Tab. B
3 Technical description of the burner
Model RL 70/M RL 100/M RL 130/M
Output (1)
High MBtu/hr (3)
GPH
1792 - 3136
12.8 - 22.4
2688 - 4480
19.2 - 32
3564 - 5824
25.6 - 41.6
Low MBtu/hr (3)
GPH
756 - 1792
5.4 - 12.8
1260 - 2688
9 - 19.2
1568 - 3584
11.2 - 25.6
Fuel # 2 fuel oil
Operation Low - high or modulating
Nozzle number 1 (return flow nozzle)
Standard applications Boilers: water, steam, thermal oil
Ambient temperature °F 32 - 104 (0 - 40 °C)
Combustion air temperature °F max 140 (60 °C)
Pump delivery (at 290 PSI)
pressure range
fuel temperature
GPH
PSI
° F max
60.8
145 - 304.5
194 (90 °C)
Noise levels (3) dB(A) 75 77 78.5
Model RL 70/M RL 100/M RL 130/M
Main electrical supply
Control circuit power supply V/Ph/Hz 208-230/3/60 120/1/60
Fan and pump motor rpm
W - HP
V
A
3490
1100 - 1.5
208-230
4
3480
2200 - 3
208-230
7.6
3480
2200 - 3
208-230
7.6
Ignition transformer V1 - V2
I1 - I2
120 V - 2 X 5 kV
2.7 A - 30 mA
Electrical power consumption W max 1300 2550 2550
Electrical control circuit consumption W750
Total electrical consumption W2050 3300 3300
Electrical protection NEMA 1

Technical description of the burner
7 2916050
GB
Tab. C
Tab. D
3.3 Burner models designations
Tab. E
Model RL 70/M RL 100/M RL 130/M
Main electrical supply
Control circuit power supply V/Ph/Hz 460/3/60 120/1/60
Fan and pump motor rpm
W - HP
V
A
3490
1100 - 1.5
460
2
3480
2200 - 3
460
3.8
3480
2200 - 3
460
3.8
Ignition transformer V1 - V2
I1 - I2
120 V - 2 X 5 kV
2.7 A - 30 mA
Electrical power consumption W max 1250 2550 2550
Electrical control circuit consumption W750
Total electrical consumption W2050 3300 3300
Electrical protection NEMA 1
Model RL 70/M RL 100/M RL 130/M
Main electrical supply
Control circuit power supply V/Ph/Hz 575/3/60 120/1/60
Fan and pump motor rpm
W - HP
V
A
3490
1100 - 1.5
575
1.6
3480
2200 - 3
575
3
3480
2200 - 3
575
3
Ignition transformer V1 - V2
I1 - I2
120 V - 2 X 5 kV
2.7 A - 30 mA
Electrical power consumption W max 1250 2500 2500
Electrical control circuit consumption W750
Total electrical consumption W2000 3250 3250
Electrical protection NEMA 1
Model Code Code RBNA Voltage Flame safeguard
RL 70/M 3477070 C9514300 208-230/3/60 Burner mountedC9514310 460/3/60
3477075 C9514301 575/3/60
RL 100/M 3477270 C9515300 208-230/3/60 Burner mountedC9515310 460/3/60
3477275 C9515301 575/3/60
RL 130/M 3477470 C9516300 208-230/3/60 Burner mountedC9516310 460/3/60
3477475 C9516301 575/3/60

2916050 8
GB
Technical description of the burner
3.4 Packaging - weight (Approximate measurements)
The burners is supplied skid mounted. Outer dimensions of
packaging are indicated in Fig. 1.
The weight of the burner complete with packaging is indicated
in Tab. F.
Tab. F
3.5 Overall dimensions
The maximum dimensions of the burner are given in Fig. 2.
Keep in mind that inspection of the combustion head requires the
burner to be opened and the rear part withdrawn on the slide bars.
The maximum dimension of the burner when open, without casing,
is given in measurement I.
Tab. G
(1) Blast tube: short - long (obtainable with kit).
3.6 Standard equipment
The burner is supplied complete with:
Screws to secure the burner flange to the boiler 1/2 W . . . . . No. 4
Flexible hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 2
Gaskets for flexible hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 2
Adaptor G 1/8” / 1/8” NPT . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Burner head gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Instruction booklet and spare parts list. . . . . . . . . . . . . . . . . . No. 1
inch A B C lbs
RL 70/M 45 9/32” 23 5/8” 31 3/16” 143
RL 100/M 45 9/32” 23 5/8” 31 3/16” 150
RL 130/M 45 9/32” 23 5/8” 31 3/16” 157
D36 Fig. 1
Fig. 2
D1217
inch A B C D E F (1) GH I (1)
RL 70/M 26 1/8” 11 21/32” 14 15/32” 21 27/32” 26 25/32” 10 23/32”-15 5/32” 7 1/16” 16 15/16” 37 7/16”-42 3/4”
RL 100/M 26 1/8” 12 9/32” 14 15/32” 21 27/32” 26 25/32” 10 23/32”-15 5/32” 7 1/16” 16 15/16” 37 7/16”-42 3/4”
RL 130/M 27 3/4” 13 5/16” 14 15/32” 21 27/32” 26 25/32” 10 23/32”-15 5/32” 7 7/16” 16 15/16” 37 7/16”-42 3/4”

Technical description of the burner
9 2916050
GB
3.7 Burner description
1 Ignition electrodes
2 Combustion head
3 Screw for combustion head adjustment
4 Screw for fixing fan to flange
5 Pressure gauge for pressure on nozzle return
6Pump
7 Non-drip nozzle holder
8 Air damper
9 Fan pressure test point
10 Boiler mounting flange
11 Flame stability disk
12 Servomotor, provides adjustment of fuel delivery regulator
and of air damper.
When the burner is not operating the air damper is fully closed
in order to reduce to a minimum heat dispersion from the
boiler.
13 Slide bars for opening the burner and inspecting the combus-
tion head
14 Photocell (cad cell)
15 High oil pressure switch
16 Extensions for slide bars 14) (with kit)
17 Ignition transformer
18 Motor contactor and thermal overload with reset button
19 Power switch for different operations: automatic - manual - off
Button for: power increase - power reduction
20 Valve assembly with pressure regulator on nozzle return
21 Terminal strip
22 Knockouts for electrical connections by installer
23 Flame safeguard with lock-out pilot light and lock-out reset
button
24 Flame inspection window
Two types of burner failure may occur:
Flame safeguard lock-out: if the flame relay 23)(Fig. 3)
pushbutton lights up, it indicates that the burner is in lock-out.
To reset, press the pushbutton.
Motor trip: release by pressing the pushbutton on thermal
overload 18)(Fig. 3).
Fig. 3
D2349

2916050 10
GB
Technical description of the burner
3.8 Firing rates
During operation, burner output varies between:
–minimum output: area A;
–maximum output: area B (and C for model RL 130/M).
The firing rate may be found by plotting a vertical line from the de-
sired delivery and a horizontal line from the pressure in the com-
bustion chamber. The intersection of these two lines is the firing
rate which must lie within area A, for MIN output, and within area
B, for MAX output.
In order to utilize also area C (RL 130/M) it is necessary to perform
the calibration of the combustion head as explained on page 18.
NOTE:
The firing rate areas given in Fig. 4 have been reduced by 10%
with respect to the maximum range that can be reached.
Consult the Procedure below to refer burner operating condition in
high altitude plants.
WARNING
The firing rate area values have been obtained con-
sidering an ambient temperature of 68 °F (20°C),
and an atmospheric pressure of 394” WC and with
the combustion head adjusted as shown on page 7.
D2350
Fig. 4
Combustion chamber
pressure - “WC
Combustion chamber
pressure - “WC
Combustion chamber
pressure - “WC

Technical description of the burner
11 2916050
GB
3.8.1 Procedure to refer burner operating condition
at an altitude and/or at a combustion supporter
air temperature different to the standard values
(328 ft above sea level, 68 °F)
Tab. H
F- correction factor of discharge head and delivery in relation to temperature and altitude.
Reference conditions:
–Air temperature 68 °F (20 °C)
– Barometric pressure 394 ''w.c. (1000 mbar)
– Altitude 328 ft a.s.l. (100 m a.s.l.)
Example
Using the Tab. H , for an altitude of 3,000 ft and an air temperature
of 68 °F, an Ffactor value is obtained equal to 0.908;
if the capacity at the boiler furnace is Qfoc = 4,500 Mbtu/h, the cor-
rect output will be equal to:
Qburner = Qfoc / F = 4,500 / 0.908 = 4,956 Mbtu/h
3.9 Minimum furnace dimensions
The firing rates were set in relation to certified test boilers.
In the Fig. 5 indicates the diameter and length of the test combus-
tion chamber.
Example
Output 2579 MBtu/hr: diameter 24 inch - length 6.6 ft.
AIR TEMPERATURE
Altitude Altitude bar. press. bar. press. 0 5 10 15 20 25 30 40 °C
ft a.s.l. m a.s.l. "w.c. mbar 32 41 50 59 68 77 86 104 °F
00399 1013,00 1,087 1,068 1,049 1,031 1,013 0,996 0,980 0,948
328 100 394 1000,00 1,073 1,054 1,035 1,017 1,000 0,983 0,967 0,936
1.000 305 385 977,40 1,049 1,030 1,012 0,994 0,977 0,961 0,945 0,915
2.000 610 371 942,80 1,012 0,994 0,976 0,959 0,943 0,927 0,912 0,883
3.000 915 358 908,20 0,975 0,957 0,940 0,924 0,908 0,893 0,878 0,850
4.000 1.220 345 875,80 0,940 0,923 0,907 0,891 0,876 0,861 0,847 0,820
5.000 1.525 332 843,50 0,905 0,889 0,873 0,858 0,844 0,829 0,816 0,790
6.000 1.830 320 811,85 0,871 0,856 0,841 0,826 0,812 0,798 0,785 0,760
7.000 2.135 307 779,80 0,837 0,822 0,807 0,793 0,780 0,767 0,754 0,730
8.000 2.440 294 747,80 0,803 0,788 0,774 0,761 0,748 0,735 0,723 0,700
Fig. 5
Diameter (inch)
length (ft)
Furnace dimensions
D2919

2916050 12
GB
Technical description of the burner
3.10 Control box for the air/fuel ratio (LAL2...)
Warning notes
All activities (mounting, installation and service work, etc.)
must be performed by qualified staff.
Before making any wiring changes in the connection area,
completely isolate the plant from mains supply (all-polar dis-
connection). Ensure that the plant cannot be inadvertently
switched on again and that it is indeed dead. If not observed,
there is a risk of electric shock hazard.
Ensure protection against electric shock hazard by providing
adequate protection for the burner control’s connection termi-
nals.
Each time work has been carried out (mounting, installation,
service work, etc.), check to ensure that wiring and parame-
ters is in an orderly state.
Fall or shock can adversely affect the safety functions. Such
units must not be put into operation, even if they do not exhibit
any damage.
Introduction
The control box for the air/fuel ratio, (hereafter referred to simply as
the control box), that equips the burners, carries out a series of in-
tegrated functions in order to optimise burner functioning, both for
single operation and together with other units (e.g. double furnace
boiler or more than one generator at the same time).
The basic functions carried out by the control box relate to:
flame control;
the dosage of air and fuel via the positioning (with direct servo-
control) of the relative valves, excluding the possible play in
the mechanical cam calibration systems;
the modulation of burner output, on the basis of the load
requested by the system, maintaining the pressure or temper-
ature of the boiler at the working values set;
the safety diagnostic of the air and fuel circuits, via which it is
possible to easily identify any causes of malfunctioning.
Installation notes
• Always run high-voltage ignition cables separately while ob-
serving the greatest possible distance to the unit and to other
cables.
• Do not mix up live and neutral conductors (fire hazard, danger-
ous failures, loss of protection against electric shock hazard,
etc.).
Electrical connection of the flame detectors
It is important to achieve practically disturbance- and loss-free sig-
nal transmission:
• Never run the detector cable together with other cables.
– Line capacitance reduces the magnitude of the flame signal.
– Use a separate cable.
• Observe the maximum permissible detector cable lengths.
• The ionization probe is not protected against electric shock
hazard. It is mainspowered and must be protected against ac-
cidental contact.
• Locate the ignition electrode and the ionization probe such that
the ignition spark cannot arc over to the ionization probe (risk
of electrical overloads).
WARNING
To avoid injury to persons, damage to property
or the environment, the following warning notes
must be observed!
The LAL2... is a safety device!
Do not open, interfere with or modify the unit.
Riello S.p.A. will not assume responsibility for
any damage resulting from unauthorized inter-
ference!
WARNING
The first start-up, like every further operation
for the internal settings of the control box, re-
quires access by means of a password and is
only to be carried out by personnel of the Tech-
nical Assistance Service who have been specif-
ically trained in the internal programming of the
tool.

Installation
13 2916050
GB
4.1 Notes on safety for the installation
After carefully cleaning all around the area where the burner will
be installed, and arranging the correct lighting of the environ-
ment, proceed with the installation operations.
4.2 Handling
The packaging of the burner includes a wooden platform, so it is
possible to move the burner (still packaged) with a transpallet truck
or fork lift truck.
4.3 Preliminary checks
Checking the consignment
4 Installation
DANGER
All the installation, maintenance and disassembly
operations must be carried out with the electricity
supply disconnected.
WARNING
The installation of the burner must be carried out
by qualified personnel, as indicated in this manu-
al and in compliance with the standards and reg-
ulations of the laws in force.
WARNING
The handling operations for the burner can be highly
dangerous if not carried out with the greatest atten-
tion: keep any unauthorised people at a distance;
check the integrity and suitableness of the available
means of handling.
Check also that the area in which you are working is
empty and that there is an adequate escape area
(i.e. a free, safe area to which you can quickly move
if the burner should fall).
When handling, keep the load at not more than 20-
25 cm from the ground.
After positioning the burner near the installation
point, correctly dispose of all residual packaging,
separating the various types of material.
CAUTION
Before proceeding with the installation operations,
carefully clean all around the area where the burner
will be installed.
CAUTION
After removing all the packaging, check the integ-
rity of the contents. In the event of doubt, do not
use the burner; contact the supplier.
The packaging elements (wooden cage or card-
board box, nails, clips, plastic bags, etc.) must
not be abandoned as they are potential sources
of danger and pollution; they should be collected
and disposed of in the appropriate places.
WARNING
The output of the burner must be within the boil-
er's firing rate.
WARNING
A burner label that has been tampered with, re-
moved or is missing, along with anything else that
prevents the definite identification of the burner
makes any installation or maintenance work diffi-
cult.

2916050 14
GB
Installation
4.4 Operating position
4.5 Preparing the boiler
4.5.1 Boring the boiler plate
Drill the combustion chamber mounting plate as shown in Fig. 7.
The position of the threaded holes can be marked using the head
gasket supplied with the burner.
4.5.2 Length of the blast tube
The length of the blast tube must be selected according to the indi-
cations provided by the manufacturer of the boiler, and it must be
greater than the thickness of the boiler door complete with its insu-
lation.
The range of lengths available, L (inch), is as in the Tab. I:
Tab. I
For boilers with front flue passes 12)(Fig. 8) or flame inversion
chambers, protective insulation material 10) must be inserted be-
tween the boiler refractory 11) and the blast tube 9).
This protective insulation must not compromise the extraction of
the blast tube.
For boilers having a water-cooled front the insulation 10)-11)(B) is
not required unless it is required by the boiler manufacturer.
Tab. J
WARNING
The burner is designed to operate only in posi-
tions 1, 2, 3 and 4 (Fig. 6).
Installation 1is preferable, as it is the only one
that allows the maintenance operations as
described in this manual.
Installations 2, 3 and 4permit operation but
make maintenance and inspection of the com-
bustion head more difficult.
DANGER
Any other position could compromise the cor-
rect operation of the appliance.
Installation 5is prohibited for safety reasons.
Fig. 6
2 3 4 51
D7739
Model Short blast tube Long blast tube
(with kit)
RL 70/M 10 23/32” 15 5/32”
RL 100/M 10 23/32” 15 5/32”
RL 130/M 10 23/32” 15 5/32”
inch A B C
RL 70/M 7 9/32” 10 27/32” - 12 13/16” 1/2 W
RL 100/M 7 9/32” 10 27/32” - 12 13/16” 1/2 W
RL 130/M 7 21/32” 10 27/32” - 12 13/16” 1/2 W
Fig. 7
D455

Installation
15 2916050
GB
4.6 Securing the burner to the boiler
Disassemble the blast tube 9)(Fig. 8) from the burner 6) by pro-
ceeding as follows:
loosen the four screws 3) and remove the cover 1);
remove the screws 2) from the two slide bars 5);
remove the two screws 4) fixing the burner 6) to the flange 7);
withdraw the blast tube 9) complete with flange 7) and slide
bars 5).
4.6.1 Combustion head calibration (RL 130/M)
At this point check, whether the maximum delivery of the burner is
contained in area B) or in area C) of the firing rate. See Fig. 4 on
page 10.
If it is in area B) then no operation is required.
If, on the other hand, it is in area C):
unscrew the screws 1)(Fig. 9) and disassemble the blast
tube 5);
unscrew the screws 3) and remove the shutter 4);
tighten the screws 3) on the rod 2);
now refit the blast tube 5) and the screws 1).
Once this operation has been carried out (if required):
secure flange 7)(Fig. 8) to the boiler plate inserting the sup-
plied gasket 8).
Use the 4 screws provided after having protected the thread
with an anti-seize product.
WARNING
The burner-boiler seal must be airtight.
Fig. 8
D1219
Fig. 9
D690

2916050 16
GB
Installation
4.7 Nozzle
The burner complies with the emission requirements of the UL 296
Standard.
In order to guarantee that emissions do not vary, recommended
and/or alternative nozzles specified by the manufacturer in the In-
struction and warning booklet should be used.
4.7.1 Recommended nozzles
Type A4 return flow nozzles - 45° angle
4.7.2 Nozzle assembly
At this stage of installation the burner is still disassembled from the
blast tube; it is therefore possible to fit the nozzle with the box
wrench 1)(Fig. 10), inserting the wrench through the central hole in
the flame stability disk.
Finally remount the burner 3)(Fig. 11) on the slide bars 2) and slide
it up to the flange 5), keeping it slightly raised to prevent the flame
stability disk from pressing against the blast tube.
Tighten the screws 1) on the slide bars 2) and screws 4) fixing the
burner to the flange.
If it proves necessary to change a nozzle with the burner already
fitted to the boiler, proceed as outlined below:
pull back the burner on its slide bars as shown in Fig. 8;
remove the nuts 1)(Fig. 12) and the disk 2);
use wrench 3)(Fig. 12) to change the nozzles.
4.7.3 Choice of nozzle
In case an intermediate delivery between the two values indicated
in the diagram (Fig. 13) is required, a nozzle with higher delivery
must be chosen.
NOTE:
the values indicated in the right side of the diagram (Fig. 13),
refer to the data printed on the nozzle.
Delivery reduction will be obtained by means of the pressure regu-
lator.
WARNING
It is advisable to replace nozzles every year during
regular maintenance operations.
CAUTION
The use of nozzles other than those specified by the
manufacturer and inadequate regular maintenance
may result into emission limits non-conforming to
the values set forth by the regulations in force, and
in extremely serious cases, into potential hazards to
people and objects.
The manufacturing company shall not be liable for
any such damage arising from nonobservance of
the requirements contained in this manual.
WARNING
Do not use any sealing products such as gas-
kets, sealing compound, or tape.
Be careful to avoid damaging the nozzle seal-
ing seat.
Fig. 10
D1220
D1221
Fig. 11
D1222
Fig. 12
D2355
Fig. 13
Nozzle flow rate - GPH
Return pressure - PSI

Installation
17 2916050
GB
4.7.4 Adjusting the nozzle flow rate
The nozzle flow rate varies according to the fuel pressure on the
nozzle return.
Diagram (Fig. 13) indicates this relationship for type A4 return flow
nozzles with pump delivery pressure of 290 PSI.
NOTE:
with a pump delivery pressure of 290 PSI, the pressure on the
nozzle return must not exceed 246.5 PSI.
The pressure difference between pump delivery and nozzle return
must be at least 43.5 PSI. With smaller pressure differences, the
pressure on the nozzle return can be unstable.
4.8 Pressure controller
The nozzle return pressure value is indicated by the pressure
gauge 1)(Fig. 14).
The output and the pressure of the nozzle are at maximum when
the servomotor is positioned on maximum.
The fine adjustment of the pressure in the return line may be
carried out by changing the setting of the eccentric 6)(Fig. 14),
of the nut and lock-nut 4)(Fig. 14).
The eccentric setting should be carried out by loosening
screws 7), and turning the screw 5) to obtain the desired
eccentricity.
Turn clockwise, screw 5) to increase the eccentricity, increas-
ing the difference between the min. and max. capacity of the
nozzle.
Turn counter-clockwise, screw 5) to decrease the eccentricity
and, consequently the difference between the min. and max.
capacity of the nozzle.
When the setting is carried out, verify manually that no slow-down
occurs between 0° and 130° and that the maximum and minimum
pressures correspond to those chosen as per diagrams (Fig. 13).
If you wish to check the delivery capacity of the nozzle, open the
burner, attach the nozzle, simulate the start-up and then proceed
with observing of the maximum and minimum pressures of the fuel.
If at the maximum capacity of the nozzle (maximum pressure in the
return line) pressure fluctuations are detected on the gauge 1),
slightly decrease the pressure in the return line until they are com-
pletely eliminated.
Key (Fig. 14)
1 Gauge for pressure in return line
2 Oil pressure switch
3 Ring for piston stop
4 Nut and lock-nut for piston setting
5 Eccentric adjusting screw
6 Variable eccentric
7 Eccentric locking screws
WARNING
The proper setting of the eccentric 6) is possible
when its operation field follows the servomotor op-
eration field (20°-130°): so, that every variation of
the servomotor position corresponds to a pressure
variation.
CAUTION
Do not let the piston bottom out repeatedly: the stop
ring 3)(Fig. 14) determines the max. stroke.
D1227
Fig. 14

2916050 18
GB
Installation
4.9 Electrode adjustment
4.10 Combustion head setting
The setting of the combustion head depends exclusively on the
maximum burner delivery at which it will be operating.
Turn screw 4)(Fig. 16) until the notch shown in diagram (Fig. 17) is
level with the front surface of flange 5)(Fig. 16).
Example:
RL 70/M, maximum light oil delivery = 16 GPH
Diagram (Fig. 17) indicates that for a delivery of 16 GPH the RL 70/
M Model requires the combustion head to be set to approx. three
notches, as shown in Fig. 16.
WARNING
Make sure that the electrodes are positioned as
shown in Fig. 15.
Fig. 15
D2528
Fig. 16
D462
N° notches
Max fuel oil delivery - GPH Fig. 17
D2351