Riello RL 34/1 MZ Quick start guide

GB
Installation, use and maintenance instructions
Instrucciones de Instalación, Funcionamiento y Mantenimiento
Instruções de Instalação, Funcionamento e Manutenção
Light oil burners
E
Quemadores de gasóleo
P
Queimadores a gasóleo
One stage operation
Funcionamiento a una llama
CODE - CÓDIGO MODEL - MODELO TYPE - TIPO
3470110 RL 34/1 MZ 971 T
3470111 RL 34/1 MZ 971 T
Funcionamento a uma chama
2916283 (8) - 01/2017

CONFORMITY DECLARATION A.R. 8/1/2004 & 17/7/2009 – Belgium
Manufacturer: RIELLO S.p.A.
I - 37045 Legnago (VR)
Tel. [phone]
http:// www.riello.com
Put into circulation by: RIELLO NV
Ninovesteenweg 198
9320 Erembodegem
Tel. [phone]
Fax. [phone]
e-mail. [email protected]
URL. www.riello.be
It is hereby certified that the apparatuses specified below conform with the model of the type described n the CE
conformity declaration and they are produced and placed in circulation in conformity with the provisions defined
in L.D. dated January 8, 2004 and 17 July 2009.
Type of product: Light oil burners
Model
971 T
RL 34/1 MZ
VALUES
MAX
NOx (mg/kWh) 169
CO (mg/kWh) 4.8
Standard applied: EN 267 and A.R. Dated 8 January, 2004 - 17 July 2009.
Legnago, 01.12.2015 Executive General Manager
RIELLO S.p.A. - Burner Department
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. U. Ferretti Mr. F. Comencini

The burner has CE marking and conforms to the basic requisites of the following Directives:
– Electromagnetic Compatibility Directive 2014/30/UE;
– Low Voltage Directive 2014/35/UE;
– Machine Directive 2006/42/EC;
The burner meets protection level of IP 40 pursuant to EN 60529 standard.
The following symbols are used in this manual:
ATTENTION = for actions requiring special care and adequate preparation.
FORBIDDEN = for actions THAT MUST NOT be performed.
!
IDENTIFICATION
The Identification Plate on the product gives the serial number, model and main technical and perfor-
mance data. If the Identification Plate is tampered with, removed or missing, the product cannot be
clearly identified thus making any installation or maintenance work potentially dangerous.
GENERAL WARNINGS
The dimension of the boiler’s combustion chamber must respond to specific values, in order to guaran-
tee a combustion with the lowest polluting emissions rate.
You are therefore advised to consult the Technical Assistance Department before choosing this type of
burner for the combination with a boiler.
Qualified personnel are those with the professional and technical requirements indicated by law no. 46 dat-
ed March 5, 1990. The commercial organisation has a widespread network of agencies and technical offic-
es whose personnel participates periodically in instructional and refresher courses at the company training
centre.
This burner must only be used for the application it was designed for.
The manufacturer cannot accept liability for any damage to persons, animals or property due to error in in-
stallation or in the burner adjustment, or due to improper or unreasonable use or non observance of the tech-
nical instruction enclosed with the burner, or due to the intervention of unqualified personnel.
USER INFORMATION
If faults arise in ignition or operations, the burner performs a "safety stop", which is signalled by the red
burner lock out Led. To rearm start up conditions, press the release button. When the burner starts up
again, the red Led goes out.
This operation can be repeated a maximum of 3 times. If the "safety stop" recurs, then the Technical
Assistance Centre must be called out.
BASIC SAFETY MEASURES
 Children or inexpert persons must not use the appliance.
Under no circumstances must the intake grids, dissipation grids and ventilation vents in the installa-
tion room be blocked with cloths, paper or any other material.
 Unauthorised persons must not attempt to repair the appliance
 It is dangerous to pull or twist the electric leads.
 Cleaning operations must not be performed if the appliance is not disconnected from the main power
supply.
 Do not clean the burner or its parts with inflammable substances (e.g. petrol, alcohol, etc.).
The cover must be cleaned with soapy water.
 Do not place anything on the burner.
 Do not leave containers and inflammable products in the installation room.

GB
1
CONTENTS
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Burner description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Packaging - Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Max. dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standard equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Firing rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Test boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Boiler plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Blast tube length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . . . . . . . 5
Choice of nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Nozzle assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Combustion head adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fan gate adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pump priming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Burner calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Burner operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Final checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Burner start-up cycle diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 14
Resetting the control box and using diagnostics . . . . . . . . . . . . 14
Faults - Possible causes - Solutions . . . . . . . . . . . . . . . . . . . . . 15
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
N.B.
Figures mentioned in the text are identified as follows:
1)(A) =Part 1 of figure A, same page as text;
1)(A)p.3 =Part 1 of figure A, page number 3.
INFORMATION ABOUT THE INSTRUCTION
MANUAL
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 nec-
essary consultation and must accompany the burner even if it is
transferred to another owner or user, or to another system. 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 instal-
lation safety, start-up, use and maintenance of the burner.
DELIVERY OF THE SYSTEM AND THE INSTRUCTION
MANUAL
When the system is delivered, it is important that:
- The instruction manual is supplied 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 Assistance
Centre;
- The system supplier carefully informs the user about:
- the use of the system,
-any further tests that may be necessary before the system is
started up,
- maintenance and the need to have the system checked at
least once a year by the manufacturer or another specialised
technician.
To ensure a periodic check, recommends the draw-
ing up of a Maintenance Contract.
..................................................................................
..................................................................................
..................................................................................
..................................................................................

2
TECHNICAL DATA
MODEL RL 34/1 MZ
TYPE 971 T
POWER (1)
OUTPUT (1)
kW 107 - 398
Mcal/h 92 - 342
kg/h 9 - 33.6
FUEL LIGHT OIL
- net calorific value kWh/kg
Mcal/kg
11.8
10.2 (10,200 kcal/kg)
- density kg/dm30,82 - 0,85
- viscosity at 20 °C mm2/s max 6 (1.5 °E - 6 cSt)
OPERATION • Intermittent (min. 1 stop in 24 hours)
• Single-stage (all - nothing)
NOZZLES number 2
STANDARD APPLICATIONS Boilers: water, steam, diathermic oil
AMBIENT TEMPERATURE °C 0 - 40
COMBUSTION AIR TEMPERATURE °C max 60
ELECTRICAL SUPPLY V
Hz
230 ~ +/-10%
50/60 - single-phase
ELECTRIC MOTOR rpm
W
V
A
2800
300
220 - 240
2.4
MOTOR CAPACITOR F/V12.5/450
IGNITION TRANSFORMER V1 - V2
I1 - I2
230 V - 2 x 12 kV
0.2 A - 30 mA
PUMP output (at 12 bar)
pressure range
fuel temperature
kg/h
bar
°C max
45
7 - 14
60
ELECTRICAL POWER CONSUMPTION W max 600
PROTECTION LEVEL IP40
dB(A) 68
79
(1) Reference conditions: Ambient temperature 20°C - Barometric pressure 1013 mbar - Altitude 0 m a.s.l.
(2) Sound pressure measured in manufacturer's combustion laboratory, with burner operating on test boiler and at maximum rated output. The
sound power is measured with the “Free Field” method, as per EN 15036, and according to an “Accuracy: Category 3” measuring accuracy,
as set out in EN ISO 3746.
VARIANTS
Model Code Electrical
supply
Blast tube
length mm
RL 34/1 MZ 3470110
3470111
single-phase
single-phase
216
351
ACCESSORIES (optional):
• KIT LONG HEAD Code 3010426
• KIT CLEAN CONTACTS Code 3010419
• KIT POST-PURGING Code 3010453
• KIT HOURCOUNTER Code 3010450
• KIT GROUND FAULT INTERRUPTER Code 3010448
• RADIO DISTURBANCEPROTECTION KIT
If the burner is installed in places particularly subject to radio disturbance (emission of signals exceeding 10 V/m)
owing to the presence of an INVERTER, or in applications where the length of the thermostat connections exceeds
20 metres, a protection kit is available as an interface between the control box and the burner.
Code 3010386
•DEGASSING UNIT
It may occur that a certain amount of air is contained in the light oil sucked up by the pump. This air may originate from the light oil itself as a con-
sequence of depressurisation or air leaking past imperfect seals.
In double-pipe systems, the air returns to the tank from the return pipe; in single-pipe systems, the air remains in circulation causing pressure var-
iations in the pump and burner malfunctions.
For this reason, we advise installing a degassing unit near the burner in single-pipe installations. Degassing units are provided in two versions:
CODE 3010054 without filter
CODE 3010055 with filter
Degassing unit characteristics
• Burner output : 80 kg/h max
• Light oil pressure : 0.7 bar max
• Ambient temperature : 40 °C max
• Light oil temperature : 40 °C max
• Attachment connectors : 1/4 inch
NOISE LEVEL (2) SOUND PRESSURE
SOUND POWER

(A)
(B)
(C)
A
D
E
F
H
I
L
O
15
8
6
711 21
13
12
10
17 45314
20
18
9
19
21
16
mm A B C kg
RL 34/1 MZ 1000 500 485 32
(1) blast tube: short - long
mm A D E F (1) HIL O (1)
RL 34/1 MZ 442 422 508 216 - 351 140 305 138 780 - 915
D7431
D88
D3937
3
BURNER DESCRIPTION (A)
1 Ignition electrodes
2 Combustion head
3 Screw for combustion head adjustment
4 Photocell for flame presence control
5 Screw for fixing fan to flange
6 Slide bars for opening the burner and
inspecting the combustion head
7 Valve assembly
8Pump
9 Plate prearranged to drill 4 holes for the pas-
sage of hoses and electrical cables.
10 Air inlet to fan
11 Fan pressure test point
12 Boiler mounting flange
13 Flame stability disk
14 Flame inspection window
15 Extensions for slide bars 6)
16 Motor capacitor
17 Control box with lockout pilot light and lock-
out reset button
18 Socket for electrical connections
19 Air damper
20 Pump pressure adjustment
21 Plate prearranged to drill 2 holes for the pas-
sage of hoses.
Two types of burner failure may occur:
Control box lockout: if the control box 17)(A)
pushbutton (red led) lights up, it indicates that
the burner is in lockout.
To reset, hold the pushbutton down for between
1 and 3 seconds.
PACKAGING-WEIGHT (B) - approximate
measurements
• The burners are shipped in cardboard boxes
with the maximum dimensions shown in
table (B).
• The weight of the burner complete with pack-
aging is indicated in table (B).
MAX. DIMENSIONS (C) - approximate meas-
urements.
The maximum dimensions of the burner are
given in (C).
Bear 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, without
casing, when open is given by measurement O.
STANDARD EQUIPMENT
2 - Flexible pipes
2 - Gaskets for flexible pipes
2 - Nipples for flexible pipes
1 - Thermal insulation screen
2 - Extensions 15)(A) for slide bars 6)(A)
(for model with 351 mm blast tube)
4 - Screws to secure the burner flange to the
boiler: M 8 x 25
1 - 7 pin plug for the electrical connection
1 - Instruction booklet
1 - Spare parts list

(A)
(B)
D9412
D454
pressure in combustion
chamber mbar
length of combustion
chamber m
4
FIRING RATES (A)
The burner delivery must be selected within area
of the adjacent diagram.
This area is called firing rate and provides the
delivery of the burner in relation to the pressure
in the combustion chamber.
The work point may be found by plotting a verti-
cal line from the desired delivery and a horizontal
line from the pressure in the combustion cham-
ber. The intersection of these two lines is the
work point which must lie within firing rate.
Important:
the FIRING RATE area values have been ob-
tained considering a surrounding temperature
of 20 °C, and an atmospheric pressure of 1013
mbar (approx. 0 m above sea level) and with
the combustion head adjusted as shown on
page 7.
TEST BOILER (B)
The firing rate was set in relation to special test
boilers in accordance with the methods defined
in EN 267 standards.
Figure (B) indicates the diameter and length of
the test combustion chamber.
Example: Delivery 35 kg/hour:
diameter = 50 cm; length = 1.5 m.
Whenever the burner is operated in a much
smaller commercially-available combustion
chamber, a preliminary test should be per-
formed.

2 3 4 51
D3928
(B)
(C)
6
5
3
1
4
29
8
10
10
7
L
mm A B C
RL 34/1 MZ 160 224 M 8
D455
D7433
(A)
5
INSTALLATION
!
THE BURNER MUST BE INSTALLED
IN CONFORMITY WITH LEGISLATION
AND LOCAL STANDARDS.
OPERATING POSITION (A)
!
The burner is designed to work only in
the positions 1, 2, 3 and 4. 
Installation 1 is preferable, as it is the
only one that allows performing maintenance
operations as described in this manual. Instal-
lations 2, 3 and 4 permit operation but make
maintenance and inspection of the combus-
tion head difficult, page 14.
Any other position could compromise
the correct working of the appliance.
Installation 5 is prohibited for safety
reasons.
BOILER PLATE (B)
Drill the combustion chamber locking plate as
shown in (B). The position of the threaded holes
can be marked using the thermal screen sup-
plied with the burner.
BLAST TUBE LENGTH (C)
The length of the blast tube must be selected
according to the indications provided by the
manufacturer of the boiler, and in any case it
must be greater than the thickness of the boiler
door complete with its fettling. The range of
lengths available, L, is as follows:
Blast tube 7):
• short 216 
• long 351
For boilers with front flue passes 10) or flame
inversion chambers, protective fettling in refrac-
tory material 8) must be inserted between the
boiler's fettling 9) and the blast tube 7).
This protective fettling must not compromise the
extraction of the blast tube.
For boilers having a water-cooled front the
refractory fettling 8)-9)(C) is not required unless
it is expressly requested by the boiler manufac-
turer.
SECURING THE BURNER TO THE BOILER (C)
Dismantle the nozzle assembly 7) and the pipe
coupling 5) from the burner 4):
- Remove the screws 2) from the two slide
bars 3).
- Remove the screw 1) and move the burner on
the guides 3).
Fix assembly 5) and 7) (C) to the boiler plate
and insert the supplied insulating gasket 6) C).
Use the four screws supplied after protecting the
thread with antiseizing products. The burner-
boiler seal must be airtight.

(1) We get the indicated delivery when both nozzles are working and light oil has the follow-
ing characteristics: density 0.84 kg/dm3 - viscosity 4.2 cSt/20 °C - temperature 10 °C
GPH kg/h (1) kW
12 bar
Nozzles
recommended
1° 2° 10 bar 12 bar 14 bar
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.00
3.50
3.50
4.00
4.00
+
+
+
+
+
+
+
+
+
+
+
+
+
1.00
1.00
1.00
1.00
1.50
1.75
1.75
2.00
2.25
2.25
2.50
2.75
3.00
8.7
9.7
10.7
12.5
14.4
16.3
17.3
19.2
20.2
22.1
23.0
25.9
26.9
9.7
10.8
11.8
13.9
15.9
18.0
19.1
21.2
22.3
24.4
25.4
28.6
29.7
10.5
11.7
12.9
15.0
17.3
19.6
20.7
23.0
24.2
26.5
27.7
31.1
32.3
115
128
140
164.8
189
213
226
251
264
289
301
339
352
DANFOS 60 ° B
DELAVAN 60° A
DELAVAN 60° W
(A)
(B)
(D)
(E)
(C)
D458
D590
D3869
1 3 2
D3869
D7434
2
13 4 5
6
CHOICE OF NOZZLES (A)
The burner complies with the emission require-
ments of the EN 267 standard.
In order to guarantee that emissions do not vary,
recommended and/or alternative nozzles speci-
fied by Riello in the Instruction and warning
booklet should be used.
!
Warning: It is advisable to replace noz-
zles every year during regular mainte-
nance operations.
!
Caution: The use of nozzles other than
those specified by Riello S.p.A. and inad-
equate 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 nonobser-
vance of the requirements contained in this
manual.
Choose the couple of nozzles among those giv-
en in table (A).
Use nozzles with a 60° spray angle at the recom-
mended pressure of 12 bar.
When the burner fires only the first nozzle works.
Its delivery is higher than that of the second noz-
zle in order to assure a good flame stabilisation
to the stability disk, though the fan delivery has
been adjusted for both working nozzles.
Whenever ignition takes place with unusual
noise or pulsations, you should reduce the first
nozzle delivery making sure that the flame stabi-
lisation is still satisfactory.
Subsequently also the second nozzle starts
working.
The burner’s operating delivery consists of the
sum of the two nozzles deliveries.
Example
Boiler output = 230 kW
Efficiency 90 %
Output required by the burner =
230 : 0,9 = 255 kW
In table (A) the following nozzles are recom-
mended:
1° = 3,0 GPH + 2° = 2,0 GPH - 60° - 12 bar.
NOZZLE ASSEMBLY
At this stage of installation the burner is still dis-
assembled from the blast tube; it is therefore
possible to fit two nozzles with the box spanner
1) (B) (16 mm), after having removed the plastic
plugs 2)(B), fitting the spanner through the cen-
tral hole in the flame stability disk. Do not use
any sealing products such as gaskets, sealing
compound, or tape. Be careful to avoid damag-
ing the nozzle sealing seat. The nozzle must be
screwed into place tightly but not to the maxi-
mum torque value provided by the wrench.
The firing nozzle is the one lying beneath the fir-
ing electrodes fig. (C)
Make sure that the electrodes are positioned as
shown in fig. (C).
Finally remount the burner 4)(D) to the slide
bars 3) 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 2) on the slide bars 3) and
screw 1) that attaches 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:
- Open the burner on its guides as shown in
fig. (C) p.5.
- Remove the nuts 1)(E) and the diffuser disc
assembly 2)
- Use spanner 3(E) to change the nozzles.

COMBUSTION HEAD ADJUSTMENT
(A)
Light oil output kg/h
3
2
1
D3910
D7435
(B)
Mcal/h
kW
D593
(C)
Notches nr.
7
COMBUSTION HEAD ADJUSTMENT
At this point of the installation, nozzle and pipe
coupling are fixed to the boiler as in fig. (C) p. 5.
The setting of the combustion head depends
exclusively on the output of the burner - in other
words, the combined output of the two nozzles
selected on page 6 is a particularly simple oper-
ation.
Turn screw 1)(A) until the notch on the sheet
2(A) is level with the plate 3)(A).
Example
RL 34/1 MZ with nozzles:
1° = 3.50 GPH + 2° = 2.50 GPH and 12 bar pump
pressure.
Find the delivery of the two nozzles in table
(A)p. 6:
25.4 kg/h (corresponding to 301 kW).
Diagram (B) shows that for an output of 25.4 kg/h
the burner RL 34/1 MZ needs a combustion head
notch regulation 3.5 approx.
Note
If the pressure in the chamber is equal to 0 mbar,
the air must be adjusted with reference to the
hatched line on the diagram (B).
Once the regulation of the head has been con-
cluded, refit the burner 4)(C)p.5 on the guides
3)(C)p.5 at approximately 100 mm from the pipe
coupling 5)(C).5, insert the electrode cables and
then slide the burner as far as the pipe coupling.
Replace the screws 2)p.5 on the guides 3)p.5.
Fix the burner to the pipe coupling with the
screw 1)p.5.
Attention
On closing the burner on the two guides it is
advisable to gently pull the high voltage wires
outwards until they are under slight tension.
FAN GATE ADJUSTMENT
The fan gate is set using the indexed selector
1)(C), after having loosened the nut 2)(C).
The first time the burner is fired, this setting
should be left as originally set by the manufactur-
er: notch 2, see fig. (C).

(A)
(B)
95
7
10
6
6
753
9
4
A
B
2
1
P
+H
8
10 cm
-H V
1
2
3
4
5
+ H
- H
(m)
L (m)
Ø (mm)
81012
+ 4.0 52 134 160
+ 3.0 46 119 160
+ 2.0 39 104 160
+ 1.0 33 89 160
+ 0.5 30 80 160
0 27 73 160
- 0.5 24 66 144
- 1.0 21 58 128
- 2.0 15 43 96
- 3.0 8 28 65
- 4.0 - 12 33
D7437
D7436
8
HYDRAULIC SYSTEM
FUEL SUPPLY
Double-pipe circuit (A)
The burner is equipped with a self-priming pump
which is capable of feeding itself within the limits
listed in the table at the side.
The tank higher than the burner A
The distance "P" must not exceed 10 meters in
order to avoid subjecting the pump's seal to
excessive strain; the distance "V" must not
exceed 4 meters in order to permit pump self-
priming even when the tank is almost com-
pletely empty.
The tank lower than the burner B
Pump depression values higher than 0.45 bar
(35 cm Hg) must not be exceeded because at
higher levels gas is released from the fuel, the
pump starts making noise and its working life-
span decreases.
It is good practice to ensure that the return and
suction lines enter the burner from the same
height; in this way it will be less probable that
the suction line fails to prime or stops priming.
The loop circuit
A loop circuit consists of a loop of piping depart-
ing from and returning to the tank with an auxil-
iary pump that circulates the fuel under
pressure. A branch connection from the loop
goes to feed the burner. This circuit is extremely
useful whenever the burner pump does not suc-
ceed in self-priming because the tank distance
and/or height difference are higher than the val-
ues listed in the table.
Key to lay-out (A)
H = Pump/Foot valve height difference
L = Piping length
Ø = Inside pipe diameter
1 = Burner
2=Pump
3=Filter
4 = Manual on/off valve
5 = Suction line
6 = Foot valve
7 = Rapid closing manual valve remote con-
trolled (only Italy)
8 = On/off solenoid valve (only Italy)
9 = Return line
10 = Check valve (only Italy)
HYDRAULIC CONNECTIONS (B)
The pumps are equipped with a by-pass that
connects return line with suction line. The
pumps are installed on the burner with the by-
pass closed by screw 6)(B)p.11.
It is therefore necessary to connect both hoses
to the pump.
The pump will break down immediately if it is run
with the return line closed and the by-pass
screw inserted.
Remove the plugs from the suction and return
connections of the pump.
Insert the hose connections with the supplied
seals into the connections and screw them
down.
Take care that the hoses are not stretched or
twisted during installation.
Pass the hoses through the holes on the left-
hand plate 5)(B), removing the thin diaphragm
that closes the two holes or as per the following
instructions: unscrew the screws 1), now divide
the insert piece into its two parts 2) and 3) and
remove the thin diaphragm blocking the two
passages 4).
Install the hoses where they cannot be stepped
on or come into contact with hot surfaces of the
boiler.
Now connect the other end of the hoses to the
supplied nipples, using two wrenches, one to
hold the nipple steady while using the other one
to turn the rotary union on the hose.

(A)
AN 57 C
A
B
C
D
E
F
G
H
kg/h
bar
bar
cSt
°C
bar
bar
mm
45
10 - 18
0,45
2 - 75
60
2
12
0,150
PUMP SUNTEC AN 57 C
D602
9
PUMP (A)
1 - Suction G 1/4"
2 - Return G 1/4"
3 - Pressure gauge attachment G 1/8"
4 - Vacuum meter attachment G 1/8"
5 - Pressure adjustment screw
A - Min. delivery rate at 12 bar pressure
B - Delivery pressure range
C - Max. suction depression
D - Viscosity range
E - Light oil max. temperature
F - Max. suction and return pressure
G - Pressure calibration in the factory
H - Filter mesh width
PUMP PRIMING
- Before starting the burner, make sure that
the tank return line is not clogged.
Obstructions in the line could cause the
sealing organ located on the pump shaft to
break. 
(The pump leaves the factory with the by-pass
closed).
- In order for self-priming to take place, one of
the screws 3)(A) of the pump must be loos-
ened in order to bleed off the air contained in
the suction line.
- Start the burner by closing the control devices
and the electrical network switch. The pump
must rotate in the direction of the arrow
marked on the cover.
- The pump can be considered to be primed
when the light oil starts coming out of the
screw 3). Stop immediately the burner and
tighten the screw 3).
The time required for this operation depends
upon the diameter and length of the suction tub-
ing. If the pump fails to prime at the first starting
of the burner and the burner locks out, wait ap-
prox. 15 seconds, reset the burner, and then re-
peat the starting operation as often as required.
After 5 or 6 starting operations allow 2 or 3 min-
utes for the transformer to cool.
Do not illuminate the photocell or the burner will
lock out; the burner should lock out anyway
about 10 seconds after it starts.
Important:
The a.m. operation is possible because the
pump is already full of fuel when it leaves the fac-
tory. If the pump has been drained, fill it with fuel
through the opening on the vacuum meter prior
to starting; otherwise, the pump will seize. When-
ever the length of the suction piping exceeds 20-
30 meters, the supply line must be filled using a
separate pump.

(A)
(B)
AIR PRESSURE IN 1) WITH ZERO PRESSURE IN 2)
kg/h mbar
9
10
12
14
16
18
20
22
24
26
28
30
32
34
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.9
5.6
6.4
7.1
7.9
D593
D7438
10
BURNER CALIBRATION
!
ATTENTION
QUALIFIED PERSONNEL WITH THE RIGHT
INSTRUMENTS MUST HANDLE THE BURN-
ER'S START-UP.
FIRING
During the first firing, when the 2nd nozzle piping
is being filled, a temporary decrease in fuel pres-
sure takes place. This lowering of the fuel pres-
sure can cause the burner to lock-out and can
sometimes give rise to pulsations.
Once the following adjustments have been
made, the firing of the burner must generate a
noise similar to the noise generated during oper-
ation. If one or more pulsations or a delay in firing
in respect to the opening of the light oil solenoid
valve occur, see the suggestions provided on p.
15: causes 29 - 35.
OPERATION
The optimum calibration of the burner requires
an analysis of the flue gases at the boiler outlet
and interventions on the following points:
• 1st and 2nd nozzles
See the information listed on page 6: “Choice of
nozzles”.
• Combustion head
The adjustment of the combustion head already
carried out (see page 7) need not be altered
unless the delivery of the burner is changed.
• Pump pressure
12 bar: This is the pressure calibrated in the fac-
tory which is usually sufficient for most purposes.
Sometimes, this pressure must be adjusted to :
10 bar in order to reduce fuel delivery. This ad-
justment is possible only if the surrounding tem-
perature remains above 0°C;
14 bar in order to increase fuel delivery or to
ensure firings even at temperatures of less
than 0°C.
In order to adjust pump pressure, use the screw
5)(A)p. 9.
• Fan air gate valve
Adjust the fan air gate valve by using the indexed
selector 1)(A) after having loosened the nut
2)(A).
This setting must be adapted case by case to the
burner's delivery (while both nozzles are operat-
ing) and combustion chamber pressure.
Air pressure at attachment 1)(B) must be approx-
imately the same as the pressure specified in ta-
ble (B) plus the combustion chamber pressure
measured at attachment 2). 
Refer to the example in the adjacent figure.

(A)
(B)
D3262
D601
LED
RMO *
D3268
Off Yellow Green Red
For further details see page 14.
*
LED
RMO *
11
BURNER OPERATION
BURNER STARTING (A) - (B)
Starting phases with progressive time intervals
shown in seconds:
• Control device TL closes.
After about 3s:
•0 s : The control box starting cycle begins.
•2 s : The fan motor starts.
•3 s : The ignition transformer is connected.
The pump 3) sucks the fuel from the tank
through the piping 1) and the filter 2) and
pumps it under pressure to delivery. The pis-
ton 4) rises and the fuel returns to the tank
through the piping 5) - 7). The screw 6) closes
the by-pass heading towards suction and the
solenoid valves 8) - 11), de-energized, close
the passage to the nozzles.
Prepurging begins with the max. air delivery.
•2
2 s : The solenoid valve 8) opens and the
fuel passes through the piping 9) and filter 10)
and is then sprayed out through the 1st noz-
zle, igniting when it comes into contact with
the spark. This is the ignition flame.
•29 s: The ignition transformer switches off.
•36 s: The solenoid valve 11) opens, the fuel
passes through the piping 13) and filter 14)
and is then sprayed out through the 2nd noz-
zle. This is the operating flame 
The starting cycle comes to an end.
STEADY STATE OPERATION
When the boiler temperature or pressure
increases until control device TL opens, the
burner shuts down.
FIRING FAILURE
If the burner does not fire, it goes into lock-out with-
in 5 s of the opening of the 1st nozzle valve and 30
s after the closing of control device TL.
The control box red pilot light will light up.
UNDESIRED SHUTDOWN DURING OPERA-
TION
If the flame goes out during operation, the burner
shuts down automatically within 1 second and
automatically attempts to start again by repeat-
ing the starting cycle.
Figure (B)
M = Pressure gauge
V = Vacuum meter

(A) D482
12
FINAL CHECKS
•Obscure the photocell and switch on the con-
trol devices: the burner should start and then
lockout about 5 s after opening of the 1st noz-
zle operation valve.
•Illuminate the photocell and switch on the con-
trol devices: the burner should start and then
go into lockout after about 10 s.
•Obscure the photocell while the burner is oper-
ating, the following must occur in sequence:
flame extinguished within 1 s, pre-purging for
about 20 s, sparking for about 5 s, burner goes
into lock-out.
•Switch off control device TL while the burner is
operating: the burner should stop.
MAINTENANCE
!
The burner requires periodic maintenance
carried out by a qualified and authorised
technician in conformity with legislation and
local standards.
!
Periodic maintenance is essential for the
reliability of the burner, avoiding the
excessive consumption of fuel and consequent
pollution.
!
Before carrying out any cleaning or control
always first switch off the electrical supply
to the burner acting on the main switch of the
system.
Combustion
The optimum calibration of the burner requires
an analysis of the flue gases. Significant differ-
ences with respect to the previous measure-
ments indicate the points where more care
should be exercised during maintenance.
Pump
The delivery pressure must be stable at 12 bar.
The depression must be less than 0.45 bar. Unu-
sual noise must not be evident during pump
operation.
If the pressure is found to be unstable or if the
pump runs noisily, the flexible hose must be
detached from the line filter and the fuel must be
sucked from a tank located near the burner. This
measure permits the cause of the anomaly to be
traced to either the suction piping or the pump.
If the pump is found to be responsible, check to
make sure that the filter is not dirty. The vacuom-
eter is installed upstream from the filter and con-
sequently will not indicate whether the filter is
clogged or not. Contrarily, if the problem lies in
the suction line, check to make sure that the filter
is clean and that air is not entering the piping.
Filters (A)
Check the following filter boxes:
• on line 1) • in the pump 2) • at the nozzle 3),
and clean or replace as required.
If rust or other impurities are observed inside the
pump, use a separate pump to lift any water and
other impurities that may have deposited on the
bottom of the tank.
Fan
Check to make sure that no dust has accumu-
lated inside the fan or on its blades, as this con-
dition will cause a reduction in the air flow rate
and provoke polluting combustion.
Combustion head
Check to make sure that all the parts of the com-
bustion head are in good condition, positioned
correctly, free of all impurities, and that no defor-
mation has been caused by operation at high
temperatures.
Nozzles
Do not clean the nozzle openings.
It is advisable to replace nozzles every year dur-
ing regular maintenance operations.
The change of nozzle requires the combustion to
be controlled.
Photocell
Clean the glass cover from any dust that may
have accumulated. To extract the photocell 4)
(A)p.3 pull it outward forcefully. it is only pressed
in.
Flexible hoses
Check to make sure that the flexible hoses are
still in good condition and that they are not
crushed or otherwise deformed.
Fuel tank
Approximately every 5 years, or whenever nec-
essary, suck any water or other impurities pres-
ent on the bottom of the tank using a separate
pump.
Boiler
Clean the boiler as indicated in its accompanying
instructions in order to maintain all the original
combustion characteristics intact, especially the
flue gas temperature and combustion chamber
pressure.

123 7
456
8
9
10
A
B
11
(A)
(B)
(C)
D3875
D3962
D3877
13
TO OPEN THE BURNER (A)
- Switch off the voltage
- Remove screw 1 and withdraw the casing 2)
- Unscrew screw 3)
- Fit the two extensions 4), on the burner, on the
guides 5) (model with nozzle 351 mm)
- Pull part A backward keeping it slightly raised
to avoid damaging the disk 6) on blast tube 7).
MAINTENANCE OF THE ELECTRICAL
PANEL (B)
If it is necessary to maintain the electrical panel
A)(Fig. A) it is possible just to remove the fan
assembly B)(Fig. A) to get better access to the
electrical components.
With the burner open as in fig. (A), disconnect
the electrode cables and remove the head unit
8)(A) by undoing the two screws 9)(A).
Disconnect the cables relative to the fan motor,
remove the 3 screws 10)(A) on the protective
sheet and the two screws 11)(A) and slide out
the fan assembly B)(Fig. A) from the guides 4) -
5)(A).
Finally it is possible to use 2 of the 3 screws
10)(A) to fix the electrical panel to the pipe cou-
pling in the points indicated on fig. (B), and then
perform the maintenance operations.
POSSIBLE PUMP AND/OR COUPLING
REPLACEMENT (C)
Carry out the fitting following the instructions in
the figure (C).

14
BURNER START-UP CYCLE DIAGNOSTICS
During start-up, indication is according to the following table:
COLOUR CODE TABLE
Sequences Colour code
Pre-purging
Ignition phase
Operation, flame ok
Operating with weak flame signal
Electrical supply lower than ~ 170V
Lock-out
Extraneous light
Key: Off Yellow Green Red
RESETTING THE CONTROL BOX AND USING DIAGNOSTICS
The control box features a diagnostics function through which any causes of malfunctioning are easily identified (indicator: RED LED).
To use this function, you must wait at least 10 seconds once it has entered the safety condition (lockout), and then press the reset button.
The control box generates a sequence of pulses (1 second apart), which is repeated at constant 3-second intervals.
Once you have seen how many times the light pulses and identified the possible cause, the system must be reset by holding the button down for
between 1 and 3 seconds.
Press reset
for > 3s 3sPulses Pulses
RED LED on
wait at least 10s
Interval
Lock-out
The methods that can be used to reset the control box and use diagnostics are given below.
RESETTING THE CONTROL BOX
To reset the control box, proceed as follows:
- Hold the button down for between 1 and 3 seconds.
The burner restarts after a 2-second pause once the button is released.
If the burner does not restart, you must make sure the limit thermostat is closed.
VISUAL DIAGNOSTICS
Indicates the type of burner malfunction causing lockout.
To view diagnostics, proceed as follows:
- Hold the button down for more than 3 seconds once the red LED (burner lockout) remains steadily lit.
A yellow light pulses to tell you the operation is done.
Release the button once the light pulses. The number of times it pulses tells you the cause of the malfunction, according to the coding system
indicated in the table on page 15.
SOFTWARE DIAGNOSTICS
Reports burner life by means of an optical link with the PC, indicating hours of operation, number and type of lock-outs, serial number of control
box etc ...
To view diagnostics, proceed as follows:
- Hold the button down for more than 3 seconds once the red LED (burner lockout) remains steadily lit.
A yellow light pulses to tell you the operation is done.
Release the button for 1 second and then press again for over 3 seconds until the yellow light pulses again.
Once the button is released, the red LED will flash intermittently with a higher frequency: only now can the optical link be activated.
Once the operations are done, the control box’s initial state must be restored using the resetting procedure described above.
BUTTON PRESSED FOR CONTROL BOX STATUS
Between 1 and 3 seconds Control box reset without viewing visual diagnostics.
More than 3 seconds Visual diagnostics of lockout condition:
(Led pulses at 1-second intervals).
More than 3 seconds starting from the visual
diagnostics condition
Software diagnostics by means of optical interface and PC (hours of operation, malfunc-
tions etc. can be viewed)
The sequence of pulses issued by the control box identifies the possible types of malfunction, which are listed in the table on page 15.

SIGNAL FAULT PROBABLE CAUSE SUGGESTED REMEDY
No blink The burner does not
start
1 - No electrical power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . Close all switches - Check fuses
2 - A limit or safety control device is open . . . . . . . . . . . . . . . . . . . Adjust or replace
3 - Control box lock-out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset control box (no sooner than 10 s after
the lock-out)
4 - Pump is jammed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
5 - Erroneous electrical connections . . . . . . . . . . . . . . . . . . . . . . . Check connections
6 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
7 - Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
8 - Defective capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
4 x blinks The burner starts and
then goes into lock-out
9 - Photocell short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace photocell
10 - Light is entering or flame is simulated. . . . . . . . . . . . . . . . . . . . Eliminate light or replace control box
2 x blinks After pre-purge and the
safety time, the burner
goes to lock-out at the
end of the safety time
11 - No fuel in tank; water on tank bottom . . . . . . . . . . . . . . . . . . . . Top up fuel level or suck up water
12 - Inappropriate head and air damper adjustments. . . . . . . . . . . . Adjust, see page 7
13 - Light oil solenoid valves fail to open (1st nozzle) . . . . . . . . . . . Check connections; replace coil
14 - 1st nozzle clogged, dirty, or deformed. . . . . . . . . . . . . . . . . . . . Replace
15 - Dirty or poorly adjusted firing electrodes. . . . . . . . . . . . . . . . . . Adjust or clean
16 - Grounded electrode due to broken insulation . . . . . . . . . . . . . . Replace
17 - High voltage cable defective or grounded. . . . . . . . . . . . . . . . . Replace
18 - High voltage cable deformed by high temperature . . . . . . . . . . Replace and protect
19 - Ignition transformer defective . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
20 - Erroneous valves or transformer electrical connections . . . . . . Check
21 - Control box defective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
22 - Pump unprimed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prime pump and see “Pump unprimes”
23 - Pump/motor coupling broken . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
24 - Pump suction line connected to return line . . . . . . . . . . . . . . . . Correct connection
25 - Valves up-line from pump closed . . . . . . . . . . . . . . . . . . . . . . . Open
26 - Filters dirty: line - pump - nozzle . . . . . . . . . . . . . . . . . . . . . . . . Clean
27 - Defective photocell or control box . . . . . . . . . . . . . . . . . . . . . . . Replace photocell or control box
28 - Dirty photocell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
7 x blinks Flame detachment 29 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust, see page 6
30 - Poorly adjusted or dirty firing electrodes . . . . . . . . . . . . . . . . . . Adjust, see page 6
31 - Poorly adjusted fan air gate: too much air . . . . . . . . . . . . . . . . Adjust
32 - 1st nozzle is too big (pulsation). . . . . . . . . . . . . . . . . . . . . . . . . Reduce 1st nozzle delivery
33 - 1st nozzle is too small (flame detachment) . . . . . . . . . . . . . . . . Increase 1st nozzle delivery
34 - 1st nozzle dirty, or deformed . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
35 - Inappropriate pump pressure . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust
Uneven fuel supply 36 - Check if cause is in pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Feed burner from tank
or fuel supply system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . located near burner
Internally rusted pump 37 - Water in tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Suck water from tank bottom with separate
pump
Noisy pump, unstable
pressure
38 - Air has entered the suction line . . . . . . . . . . . . . . . . . . . . . . . . Tighten connectors
- Depression value too high (higher than 35 cm Hg):
39 - Tank/burner height difference too great. . . . . . . . . . . . . . . . . . . Feed burner with loop circuit
40 - Piping diameter too small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase
41 - Suction filters clogged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean
42 - Suction valves closed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open
43 - Paraffin solidified due to low temperature . . . . . . . . . . . . . . . . . Add additive to light oil
Pump unprimes after
prolonged pause
44 - Return pipe not immersed in fuel . . . . . . . . . . . . . . . . . . . . . . . Bring to same height as suction pipe
45 - Air enters suction piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tighten connectors
Pump leaks light oil 46 - Leakage from sealing organ . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace pump
Smoke in flame
- dark Bacharach
- yellow Bacharach
47 - Not enough air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust head and fan gate, see page 7
48 - Nozzle worn or dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
49 - Nozzle filter clogged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean or replace
50 - Erroneous pump pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust to between 10 - 14 bar
51 - Flame stability spirat dirty, loose, or deformed . . . . . . . . . . . . . Clean, tighten in place, or replace
52 - Boiler room air vents insufficient . . . . . . . . . . . . . . . . . . . . . . . . Increase
53 - Too much air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust head and fan gate, see page 7
Dirty combustion head 54 - Nozzle or filter dirty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
55 - Unsuitable nozzle delivery or angle. . . . . . . . . . . . . . . . . . . . . . See recommended nozzles, page 6
56 - Loose nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tighten
57 - Impurities on flame stability spiral . . . . . . . . . . . . . . . . . . . . . . . Clean
58 - Erroneous head adjustment or not enough air . . . . . . . . . . . . . Adjust, see page 10; open gate valve
59 - Blast tube length unsuited to boiler. . . . . . . . . . . . . . . . . . . . . . Contact boiler manufacturer
10 x blinks 60 - Connection or internal fault
61 - Presence of electromagnetic disturbance . . . . . . . . . . . . . . . . . Use the radio disturbance protection kit)
15

APPENDIX
Electrical wiring
NOTES
Electrical wiring must be made in accordance with
the regulations currently in force in the country of
destination and by qualified personnel.
Riello S.p.A. declines all liability for modifications or
connections other than those shown on these dia-
grams.
Use flexible cables according to standard EN 60 335-1.
All the cables to be connected to the burner are fed
through the grommets.
The use of the grommets can take various forms; by
way of example we indicate the following mode:
1- 7 pole socket for single phase power supply, ther-
mostat/pressure switch TL
2 - 2A Housing for the nozzles
(Drill if 2A nozzles are required)
• The RL 34/1 MZ burners have been type-approved for intermittent operation. This means they 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. Normally the boiler's limit thermostat pressure
switch TL ensures the stopping of the burner. If this is not the case, it is necessary to apply in series with IN a timer switch that turns off the
burner at least once every twenty-four hours.
ATTENTION:
- Do not invert the neutral with the phase wire in the electricity supply line. Any inversion would cause a lockout due
to firing failure.
- Only use original spare parts to replace the components.
NOTES
2
2A
1
D7439
16

1
2 Indexisation of references
Electrical wiring that the installer is responsible for
4
Electrical panel layout
CONTENTS
3Functional diagram
2Indexisation of references
Sheet no.
/1.A1
Coordinates
17