Ferroli RENDIMAX N EL User manual

Appr. Nr. A 9504 A • 0085 AQ 0766
RENDIMAX N EL
gas-fired cast iron boiler for central heating
with electronic ignition and flame control
OPERATING, INSTALLATION AND MAINTENANCE INSTRUCTIONS
cod. 3543742/3 - 05/2005

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Warning
• Read the warnings given in this manual thor-
oughly. They provide important information for
safe installation, use and maintenance
• Keep the manual carefully for future consul-
tation.
• The instruction manual is an integral and es-
sential part of the product and must be kept
by the user.
• If the appliance is sold or transferred to another
owner or if the owner moves, leaving the ap-
pliance behind, always ensure that the manual
is kept with the appliance for consultation by
the new owner and /or installer.
• Incorrect installation or poor maintenance
absolves the manufacturer from all liability for
damage to people or things.
• Installation and maintenance must be carried
out i conformity with current legislation, ac-
cording to the manufacturer’s instructions and
by qualified personnel.
• Before cleaning or maintenance, disconnect the
appliance from the mains via the switch on the
appliance or a suitable isolating device.
• In the event of malfunction or faulty operation,
deactivate the appliance. Do not attempt to
repair or carry out any other operation on the
appliance directly. Contact qualified personnel
only.
• Repairs or the replacement of components must
be carried out exclusively by qualified person-
nel using original spare parts only. Failure to
respect the above my compromise the safety
of the appliance.
• To guarantee efficient operation, the appliance
must be serviced once a year by an authorised
service centre.
• The appliance may not be used for purposes
other than those for which it was explicitly de-
signed. Any other use is considered improper
and therefore dangerous.
• Incorrect installation and use or failure to follow
the instructions provided by the manufacturer
absolve the manufacturer from all liability for
damage.
• After unpacking, check that the contents are
whole and undamaged.
• Keep packing out of reach of children as it is
potentially hazardous.
• To clean external parts, use a damp cloth mois-
tened with soapywater if necessary.Avoid using
abrasive cleaning products and solvents.

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INDEX
OPERATING INSTRUCTIONS
1. Description of the boiler....................................................................................................................... 5
2. Main components ................................................................................................................................. 6
3. Ignition and shut-down......................................................................................................................... 7
4. Checks and maintenance...................................................................................................................... 8
INSTALLATION AND MAINTENANCE INSTRUCTIONS
5. Description of the boiler....................................................................................................................... 9
6. Main components ............................................................................................................................... 10
7. Technical specifications ...................................................................................................................... 11
8. Installation and safety devices............................................................................................................ 16
9. Electrical connections ......................................................................................................................... 18
10. Set-up................................................................................................................................................ 20
11. Settings............................................................................................................................................. 21
12. Gas conversion ................................................................................................................................. 23
13. Checks and maintenance.................................................................................................................. 24
14. Troubleshooting ............................................................................................................................... 26

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5
OPERATING INSTRUCTIONS
1. DESCRIPTION OF THE BOILER
1.01 Presentation of the boiler
The “Rendimax N EL” floor-standing boilers are gas-fired heat generators for central heating systems, with cast-
iron bodies.
They are fitted with electronic ignition devices, automatic operation control (electronic flame control unit) and flue
gas sensors for verifying the correct discharge of the combustion gases.
The “Rendimax N EL PV” models are also pre-fitted with a variable-speed pump, expansion vessel and safety
valve.
The boilers are manufactured as standard for operation on natural gas (G20); For operation on LPG (G31), the
boilers must be converted on-site.
1.02 Instructions and requirements
The assembly, installation, conversion to other type of gas, commissioning and maintenance of the boiler must be
performed by specialist Companies, following all the relative technical requirements and standards. The boiler must
be installed according to the Standards and Laws in force, in particular regarding the size of the boiler room, the
discharge of flue gases, the water piping, the combustible gas supply system and the electrical system.
1.03 Checking and controlling the discharge of flue gases
The boiler is fitted with a flue gas thermostat, which cuts off the supply of gas to the burner in the event of incor-
rect functioning of the flue.
If the flue gas thermostat is activated, unscrew the protective cover on the control panel (3, Fig. 1) and press the
manual reset button; the boiler will then re-ignite.
If the flue gas thermostat is activated frequently, shut-down the boiler and call the Service Department.

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2. MAIN COMPONENTS
Fig. 1
Key
1Boiler thermostat
2Thermal pressure gauge
3Flue gas thermostat cover
4Gas valve
5Cap (ready for mounting electronic control unit)
6Drain valve
7Electrode assembly
8Control panel
9Burner assembly
Front view of the boilers with control panel cover open
5 3 11 10
14
15
13
9
6
7
12
8
1
2
4
8
5 3 11 10 1312
10 Boiler switch
11 Reset button for electronic flame control unit
12 Electronic flame control unit
13 Safety thermostat with automatic reset
14 Heating system pump (PV version)
15 Cap on fitting for filling the system (PV version)
Mod. 16-23 PV Mod. 30-36

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3. IGNITION AND SHUT-DOWN
3.01 Ignition
Place the boiler thermostat in the “minimum temperature” position and power the appliance using the boiler
switch.
To ignite the burner assembly, proceed as follows:
• open the gas cock (fitted by the installer);
• adjust, using the knob, the boiler thermostat to the desired value (not less than 50°C.).
At this stage, the electronic control unit starts operating and will pilot, after a set waiting time, the gas valve and
the spark to the ignition electrode, which in turn will light the burner assembly. The ionisation electrode then checks
the presence of the flame in the burner assembly.
The boiler operates automatically, controlled by the boiler thermostat and/or any other control devices (room
thermostat, electronic temperature control unit, etc.).
Note If after having correctly performed the ignition operation, the burners do not light and the reset button light
on the electronic control unit (11 - Fig. 1) is on, wait around 10 seconds and then press the reset button. The
control unit is reset and will repeat the ignition cycle.
Note In the event of power failure, the burners will shut-down and will be automatically ignited once the power
returns.
3.02 Temporary shut-down
To temporarily shut-down the boiler, simply place the boiler switch (10- Fig. 1) in position ”0”.
3.03 Extended boiler shut-down
To shut the boiler down, proceed as follows:
• turn the knob of the boiler switch to position ”0”;
• close the gas cock upstream from the boiler;
• disconnect power to the appliance.
Note If the boiler is not used for an extended period in winter, to avoid damage from frost, special anti-freeze
should be added to the system, or else the system should be completely emptied (operation to be performed
only by qualified personnel).
3.04 Adjusting the central heating supply temperature
The supply temperature can be set using the boiler thermostat. The field of adjustment for the knob (1 - Fig. 1)
is 30-90 °C. It is not recommended to set the temperature below 50°C, to avoid dangerous condensation from
occurring.

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4. CHECKS AND MAINTENANCE
Attention
Current technical standards envisage periodic maintenance of the appliance, as well as analysis of the composi-
tion of the flue gas, to check correct combustion in the burner assembly. As a result, it is suggested that the user
stipulate a programmed maintenance contract with a specialised company to periodically carry out the operations
listed below.
4.01 General notes on maintenance
Have the correct operation and integrity of the flue checked periodically.
In the event of work or maintenance on structures located near the flues and/or flue gas discharge devices and
accessories, shut the appliance down and, upon completion of the work, have the condition of such parts checked
by professionally qualified personnel.
Do not clean the appliance and/or its parts with easily inflammable substances (e.g. petrol, alcohol, etc.).
Do not leave containers with inflammable substances in the room where the appliance is installed.
4.02 System checks (to be performed once a year)
The system is generally checked at the end of the winter season. Check that the water in the expansion vessel is
pressurised. Verify serviceability and operation of the pumps.
4.03 Boiler checks (to be performed once a year)
• Check the boiler for correct operation by effecting ignition and shut-down tests using the regulation
thermostat.
• Check on the rear wall of the boiler, at the height of the draught diverter, that there are no flue gas leaks, signs
of any blockages in the flue or insufficient draught.
• Check that the connecting pipe between the boiler and flue is perfectly sealed at the joints.
4.04 Cleaning the boiler and the flue
To be performed once every 3 years.
4.05 Cleaning the burner assembly
To be performed once a year.

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INSTALLATION AND MAINTENANCE INSTRUCTIONS
5. DESCRIPTION OF THE BOILER
5.01 presentation of the boiler
The “Rendimax N EL PV” floor-standing boilers are gas-fired heat generators for central heating systems, with
cast-iron bodies.
They are fitted with electronic ignition devices, automatic operation control (electronic flame control unit) and flue
gas sensors for verifying the correct discharge of the combustion gases.
The “Rendimax N EL PV” models are also pre-fitted with a variable-speed pump, expansion vessel and safety
valve.
The boilers are manufactured as standard for operation on natural gas (G20).
The appliance can be converted from operation on natural gas to lpg (G31); refer to the instructions provided in
paragraph 12.
5.02 instructions and requirements
The assembly, installation, commissioning and maintenance of the boiler must be performed by specialist compa-
nies, following all the relative technical requirements and standards. The boiler must be installed according to the
standards and laws in force, in particular regarding the size of the boiler room, the discharge of flue gases, the
water piping, the combustible gas supply system and the electrical system.

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6. MAIN COMPONENTS
6.01 main components
Key
1Boiler thermostat
2Thermal pressure gauge
3Flue gas thermostat cover
4Gas valve
5Cap (ready for mounting electronic control unit)
6Drain valve
7Electrode assembly
8Control panel
9Burner assembly
10 Boiler switch
11 Reset button for electronic flame control unit
12 Electronic flame control unit
13 Safety thermostat with automatic reset
14 Hheating system pump (pv version)
15 Cap on fitting for filling the system (pv version)
16 Flue thermostat bulb
17 Smokebox
18 Safety valve (pv version)
19 Expansion vessel (pv version)
fig. 2
5 3 11 10
14
15
13
9
6
7
12
8
1
2
4
8
5 3 11 10 1312
19
18
17
16
Mod. 16-23-30 PVMod. 16-23 PV Mod. 30-36
Front view of the boilers
with control panel cover open
Rear view

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7. TECHNICAL SPECIFICATIONS
7.01 Table of technical specifications, dimensions and connections (base version)
Maximum boiler operating temperature 100°c.
Injectors
Natural Gas (G20)
MODEL
Rendimax N 16 EL
Rendimax N 23 EL
Rendimax N 30 EL
Rendimax N 36 EL
Injectors
L.P.G. (G31)
Conections
MODEL
Rendimax N 16 EL
Rendimax N 23 EL
Rendimax N 30 EL
Rendimax N 36 EL
Gas supply
pressure
mbar
Dimensions
Heat output Heat input (NET)
MODEL Nominal Adjustable up to: Min.Nominal
Rendimax N 16 EL
Rendimax N 23 EL
Rendimax N 30 EL
Rendimax N 36 EL
kW
16,2
23,0
29,5
36,0
kcal/h
14.000
19.800
25.400
31.000
kW
18,0
25,5
32,8
40,0
kcal/h
15.500
22.000
28.200
34.400
kW
12,7
18,4
23,0
27,6
kcal/h
11.000
15.800
19.800
23.800
Number
of
sections
3
4
5
6
Boiler
water
content
lt.
7,3
9,0
10,7
12,4
Max.
working
pressure
bar
6
6
6
6
Ø injector
mm
2,45
2,35
2,35
2,35
Nominal
pressure
mbar
13,0
15,2
14,2
13,5
Ø injector
mm
1,55
1,50
1,50
1,50
Nominal
pressure
mbar
35
35
35
35
Gas flow
rate
L.P.G. G31
kg/h
Natural G20
m3S/h
VK 4105C1009
VK 4105C1009
VK 4105C1009
VK 4105C1009
Gas valve
Honeywell
kcal/h
9.500
13.800
17.200
20.600
kW
11,0
16,0
20,0
24,0
Number
injectors
2
3
4
5
Natural
G20
18-20
18-20
18-20
18-20
L.P.G.
G31
37
37
37
37
min.
1,16
1,69
2,46
2,95
nom.
1,94
2,70
3,47
4,23
min.
0,90
1,31
1,63
1,96
nom.
1,50
2,08
2,68
3,27
Return
a1
1"
1"
1"
1"
Flow
a2
1"
1"
1"
1"
Gas
inlet
a3
1/2"
1/2"
1/2"
1/2"
400
400
500
600
A
mm
57
62
72
82
B
mm
33
33
33
58
C
mm
62
24
36
47
D
mm
100
110
130
150
Ø
mm
a1
B
A
Ø
a3
a2
D
D
284
850
660
590
600
C
fig. 3a

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7.02 Table of technical specifications, dimensions and connections (pv version)
Maximum boiler operating temperature 100°C
Natural Gas (G20)
MODEL
Rendimax N 16 EL PV
Rendimax N 23 EL PV
Rendimax N 30 EL PV
L.P.G. (G31)
Conections
MODEL
Rendimax N 16 EL PV
Rendimax N 23 EL PV
Rendimax N 30 EL PV
Gas supply
pressure
mbar
Dimensions
Heat output Heat input (NET)
MODEL Nominal Adjustable up to: Min.Nominal
Rendimax N 16 EL PV
Rendimax N 23 EL PV
Rendimax N 30 EL PV
kW
16,2
23,0
29,5
kcal/h
14.000
19.800
25.400
kW
18,0
25,5
32,8
kcal/h
15.500
22.000
28.200
kW
12,7
18,4
23,0
kcal/h
11.000
15.800
19.800
Number
of
sections
3
4
5
Boiler
water
content
lt.
7,3
9,0
10,7
Max.
working
pressure
bar
6
6
6
Ø injector
mm
2,45
2,35
2,35
Nominal
pressure
mbar
13,0
15,2
14,2
Ø injector
mm
1,55
1,50
1,50
Nominal
pressure
mbar
35
35
35
Gas flow rate
L.P.G. G31
kg/h
Natural G20
m
3
S/h
VK 4105C1009
VK 4105C1009
VK 4105C1009
Gas valve
Honeywell
kcal/h
9.500
13.800
17.200
kW
11,0
16,0
20,0
min.
1,16
1,69
2,46
nom.
1,94
2,70
3,47
min.
0,90
1,31
1,63
nom.
1,50
2,08
2,68
L.P.G.
G31
37
37
37
Natural
G20
18-20
18-20
18-20
Return
a1
1"
1"
1"
Flow
a2
1"
1"
1"
Gas
inlet
a3
1/2"
1/2"
1/2"
Capacità
vaso
espansione
6
6
8
lt.
Valvola
di
sicurezza
3
3
3
bar
400
400
500
A
mm
57
62
72
B
mm
33
33
33
C
mm
62
24
36
D
mm
72
34
46
E
mm
622
622
637
F
mm
100
110
130
Ø
mm
Number
injectors
2
3
4
B
A
Ø
a3
a2
a1
D
E
660
590
510
C
F
850
600
fig. 3b

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7.03 output variability characteristics
The heat rate of the boiler furnace and, as a consequence, the heat output delivered to the central heating water,
can be adjusted by simply adjusting the main burner assembly via the gas valve. The diagrams in figs. 4a and 4b
indicate the variation in heat output delivered to the water in relation to the adjustment of the operating pressure
of the burner assembly. The possibility of adjusting the boiler output to the effective needs of the central heating
system, means above all reductions in heat loss and thus savings in gas consumption. Furthermore, with the output
variation feature, governed by the relative standards, the boiler maintains near constant thermal efficiency values
and combustion characteristics.
The instructions for adjusting the gas valve are provided in chapter 11.
Output variability on natural gas (G20)
Output variability on L.P.G. (G31)
1 = Model 16
2 = Model 23
3 = Model 30
4 = Model 36
1 = Model 16
2 = Model 23
3 = Model 30
4 = Model 36
Fig. 4b
Fig. 4a
14
17 18 19 20
21 22 23 24 25 26
27 28 29 30
16
31
15
14
13
12
11
15
kW
10 12 14
kcal/h
x 1000
911 13
29 37
36
35
34
33
32
31
30
28
27
26
25
20
19
18
17
16
mbar
6
2
3
4
5
7
8
9
10
11
12
13
21 22 23 24
16
15
1
2
34
35
25
30
1
mbar
10
29
13
11
9
15
20
27 28
30
kcal|h
x 1000
kW
26
14
12
10
31 32 33 34
25
35 36 37
15
11 12 13 14 15
31
16
30
29
28
27
26
25
24
23
22
21
20
19
18
17
20
19
21 22
18
23 24
17
16
2 3 4

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1, 2, 3 = Positions of the switch on the pump
7.04 characteristics of the pump built into the boiler (models 16 -23 - 30 pv)
The discharge head and the flow-rate can be adjusted on the pump using the speed selector switch on the pump
itself.
7.05 adjusting the thermal head (∆t) of the heating system (models 16-23-30 pv)
The difference between the supply and return temperature in the central heating system can be adjusted using the
speed selector switch on the pump. In this way, the flow-rate and discharge head of the pump itself are adjusted.
Increasing the rpm of the pump, the ∆t decreases, and vice-versa.
Warning A difference between supply and return temperature of over 20°c may endanger the boiler due to
condensation; a lower ∆t value is thus recommended.
fig. 5
Flow-rate Q (m3/h)
Discharge head h (m)

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15
.8.7.6.5.4.3.2.1 1.9
Discharge head h (m)
32
Flow-rate Q (m3/h)
.7
.8
.9
1
2
3
4
5
7.06 pressure drop as a function of heating system water flow-rate
7.07 Residual discharge head available to the heating system (models 16-23-30 PV)
Note The diagram in fig. 7 refers to the maximum heating pump discharge head/flow-rate with the speed selector
switch in position 3.
fig. 6
fig. 7
.03 .04 .05 .07 .08 .09 .1.06 .3 .4 .5 .7 .8 .9 1.6.2
.2
.3
.4
.5
.6
.7
.8
.9
1
2
3
Pressure drop ∆p (m)
Flow-rate Q (m3/h)

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8. INSTALLATION AND SAFETY DEVICES
• The boiler must only be installed by specialist companies according to the instructions, requirements and laws
in force
• This boiler must only be used for the application it has been specifically designed for.
Important
This boiler is used to heat water to temperatures below boiling, at atmospheric pressure. The boiler must
be connected to a central heating system compatible with its performance and output rating.
8.01 preliminary operations
The boiler must be installed in a suitable room complaint with the standards and regulations in force. Before con-
necting the boiler, perform the following operations:
• Carefully clean all the pipe work in the heating system to remove any residues or impurities that may compromise
the correct operation of the boiler;
• Check that the boiler is configured for operation with the type of combustible gas available. This is written on
the packaging and on the rating plate;
• Check that the chimney/flue has a suitable draught, is not choked and that there are no discharges inserted
from other appliances, except where the flue has been created to serve a series of appliances, according to the
specific standards and regulations in force. Only after having performed this check can the joiner pipe between
the boiler and chimney/flue be fitted.
• Check any existing flues to make sure they have been carefully cleaned, as any scale flaking off the side walls
during operation may block the passage of the flue gas, creating extremely dangerous situations for the user.
8.02 On-off valves
It is recommended to fit on-off valves between the boiler and the central heating system; these allow the boiler to
be isolated from the heating system, if necessary.
8.03 Boiler room
Warning This appliance can only be installed and operated in permanently ventilated rooms.
8.04 Connection to the flue
The flue connection pipe must be no smaller in diameter than the fitting on the draught diverter. Starting from the
draught diverter, it must follow a vertical course of no less than half a metre. The dimensions and installation of
the flues and the connecting pipes must respect the standards in force.
8.05 Heating system connection
Perform the connections to the corresponding fittings according to the positions indicated in figs. 3a and 3b. The
discharge of the safety valve must be connected to a collection container, to avoid water spilling on the ground in
the event of over-pressure in the central heating circuit.
Note if the central heating supply and return pipes follow a course in which, at some point, air pockets may be
created, an air valve should be installed at the corresponding points.
When the boiler is installed below the level of the central heating system, a “flow-stop” valve should be fitted to
stop the natural flow of water in the central heating system.

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8.06 Filling the system
The installer must ensure that the system is provided with a manual or automatic filling system.
The filling pressure when the heating system is cold must be between 0.5 and 1 bar. If, during operation, due to
the evaporation of the gases dissolved in the water, the heating system pressure falls below the minimum value
described above, it should be returned to the initial value. For correct operation, the water pressure in the boiler,
when hot, must be around 1.5 bar.
8.07 Gas connection
The gas connection is made using a pipe, with the fitting of a gas cock.
Please note that any flexible connection pipes must be approved for such use.
8.08 Checks
Fill the system as indicated above. Check the water circuits and combustible gas system for tightness. When che-
cking the gas system for tightness, proceed with care using soapy water.
Note The manufacturer declines all liability for damage to persons or things resulting from the failure to electrically
earth the boiler.
8.09 Safety devices
The rendimax el boiler is fitted with appropriate devices to ensure safety in the event of operating anomalies.
Contact an authorised service centre to check the correct operation of these devices.
8.10 Over-pressure safety device (for models 16, 23 and 30 pv)
This device is designed to prevent the central heating system pressure from exceeding 3 bar.
To check the efficiency of this device, open the system fill valve and check that, on exceeding the pressure value
indicated above, the safety valve intervenes to discharge the excess water
8.11 Temperature limiting device (safety thermostat) with automatic reset
The function of this device is to prevent the temperature of the heating system water from exceeding boiling
temperature.
The maximum activation temperature is 110°c.
The temperature limiting device is automatically deactivated only when the boiler has cooled (the temperature
must fall by at least 10°c) and when the problem has been identified and resolved. The safety thermostat (part 13
in fig. 2) is located on the control panel.
8.12 Flue gas safety sensor device (flue gas thermostat)
The boiler is fitted with device for checking the discharge of the products of combustion. If any anomalies arise in
the flue gas discharge system, with the consequent emission of burnt gas into the room, the appliance will shut
down. To measure and control the temperature of the flue gas, the wind-protection hood is fitted with a tempe-
rature sensor bulb (pos. 16 fig. 2).
Any release of burnt gas into the room causes the temperature measured by the bulb to increase, and as a conse-
quence the boiler is shut-down within 2 minutes, by cutting off the supply of gas to the burner assembly.
If the flue gas sensor is activated, unscrew the protective cover (3, fig. 2) on the control panel and manually reset
the device. The boiler will recommence operation.
If, in the event of failure, the sensor needs to be replaced, only use original accessories, and check that the electrical
and bulb connections are performed correctly.
N.B. The flue gas sensor must not be bypassed under any circumstances!

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18
9. ELECTRICAL CONNECTIONS
9.01 electrical connection
The boiler must be connected to a single-phase, 230 volt - 50 hz (phase/neutral) power supply, with 3 a max fu-
ses, and a bipolar switch with minimum contact opening of at least 3 mm fitted between boiler and the source
of power. It is important to always properly earth the boiler. . The control panel is fitted with a terminal block for
connecting the boiler to any room thermostats or electronic temperature control units present (follow the wiring
diagrams in figs. 8 and 9). To access this terminal block and the various components inside the control panel, see
paragraph 9.02.
Note If replacing the power cable, only use “HAR H05 VV-F” 3x0.75 mm2cables, with a maximum external dia-
meter of 8 mm
Diagram of electrical connections
fig. 8
Note Dashed wiring to be handled by the installer
N.B. The manufacturer declines all liability for damage to persons or things resulting from the failure to electrically
earth the boiler.
24 Ignition electrode
32 Heating system pump (models 16-23-30 pv)
44 Gas valve
49 Safety thermostat
63 Boiler thermostat
72 Room thermostat (not supplied)
82 Detection electrode
83 Electronic flame control unit
92 Flue gas thermostat with manual reset
98 Boiler switch
129 Reset button with pilot light
159 Test knob
160 Auxiliary contact
242 Connector for thermostatic control unit

Rendimax N EL
19
fig. 9
Operating principle wiring diagram
Note Dashed wiring to be handled by the installer
N.B. The manufacturer declines all liability for damage to persons or things resulting from the failure to electrically
earth the boiler.
24 Ignition electrode
32 Heating system pump (models 16-23-30 pv)
44 Gas valve
49 Safety thermostat
63 Boiler thermostat
72 Room thermostat (not supplied)
82 Detection electrode
83 Electronic flame control unit
92 Flue gas thermostat with manual reset
98 Boiler switch
129 Reset button with pilot light
159 Test knob
160 Auxiliary contact

Rendimax N EL
20
9.02 opening the control panel
To access the electrical components inside the control panel, follow the sequence in fig. 10.
fig. 10
10. SET-UP
10.01 first ignition
The first ignition and the training of the user for the correct operation of the boiler must be carried out by an
authorised service centre.
10.02 checks to be performed upon first ignition
During the first ignition of the boiler, it is important to check that the on-off valves between the boiler and the
heating system are open; that the heating circuit is filled and vented of air; that there are no gas or water leaks in
the heating system or in the boiler; that the electrical connections are correct and that the earth cable is connected
to an adequate earth system; that there are no inflammable liquids or materials in the immediate vicinity of the
boiler; and that the flue is not blocked.
10.03 ignition
Set the boiler thermostat to the “minimum temperature” position, and power the appliance using the boiler
switch.
To ignite the burner assembly, proceed as follows:
• Open the gas cock (fitted by the installer);
• Vent the air in the gas pipes using the air vent fitted upstream from the gas valve (fig. 11).
• Adjust the knob on the boiler thermostat to the desired value (not less than 50 °C.).
At this stage the electronic control unit starts operating and will pilot, after a set waiting time, the gas valve and
the spark to the ignition electrode, which in turn will light the burner assembly. The ionisation electrode then checks
the presence of the flame in the burner assembly.
The boiler operates automatically, controlled by the boiler thermostat and/or any other control devices (room
thermostat, electronic temperature control unit, etc.).
3
1
5
2
4
Key
1Boiler cover
2Protective cover fastening screw
3Wiring protective cover
4Fastening plate and screw
5Control panel