Baxi Nuvola 3 Comfort User manual

High performance gas-red wall-mounted boiler
operating and installation instructions
GB

2C607215 - GB
INSTRUCTIONS FOR USERS
Dear Customer,
We are condent your new boiler will meet all your requirements.
All BAXI products have been designed to give you what you are looking for: good performance combined with simple and rational use.
Please do not put away this booklet without reading it rst as it contains some useful information which will help you to operate your boiler correctly
and eciently.
Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger
BAXI S.p.A. declares that these models of boiler bear the CE mark in compliance with the basic require-
ments of the following Directives:
- Gas Directive 90/396/EEC
- Eciency Directive 92/42/EEC
- Electromagnetic Compatibility Directive 2004/108/EEC
- Low Voltage Directive 2006/95/EC
1. Instructions prior to installation 3
2. Instructions prior to commissioning 3
3. Commissioning the boiler 4
4. Special functions 9
5. Filling the system 11
6. Turning o the boiler 12
7. Gas conversion 12
8. Prolonged shutdown. Frost protection 12
9. Troubleshooting 12
10. Routine maintenance instructions 13
11. General information 14
12. Instructions prior to installation 14
13. Installing the boiler 15
14. Dimensions of boiler 15
15. Contents of pack 16
16. Installation of ue and air ducts 16
17. Connecting the mains supply 20
18. Installing the climate controller 21
19. Gas conversion methods 23
20. Visualisation of electronic board parameters on boiler display (“info” function) 25
21. Parameters setting 27
22. Adjustment and safety devices 28
23. Positioning the ignition and ame-sensor electrode 29
24. Checking combustion parameters 29
25. Output/pump head performance 30
26. Draining the storage boiler 30
27. Connection of an external storage boiler 31
28. Electrical connection to a zone system 33
29. Annual servicing 34
30. Circuit diagram 35-36
31. Illustrated wiring diagram 37-38
32. Technical data 39
CONTENTS
INSTRUCTIONS FOR USERS
INSTRUCTIONS FOR FITTERS
BAXI S.p.A., a leading European manufacturer of hi-tech boilers and heating systems, has developed CSQ-certied quality management
(ISO 9001), environmental (ISO 14001) and health and safety (OHSAS 18001) systems. is means that BAXI S.p.A. includes among its
objectives the safeguard of the environment, the reliability and quality of its products, and the health and safety of its employees.
rough its organisation, the company is constantly committed to implementing and improving these aspects in favour of customer
satisfaction.

3C607215 - GB
INSTRUCTIONS FOR USERS
is boiler has been designed to heat water to a temperature lower than boiling point at atmospheric pressure. It must be connected to
a central heating system and to a domestic hot water supply system according to its performance and power output.
Before having the boiler installed by a qualied service engineer, make sure the following operations are performed:
a) Make sure that the boiler is adjusted to use the type of gas delivered by the gas supply. To do this, check the markings on the packaging
and the rating plate on the appliance.
b) Make sure that the ue terminal dra is appropriate, that the terminal is not obstructed and that no exhaust gases from other appliances
are expelled through the same ue duct, unless the latter has been specially designed to collect exhaust gas from more than one
appliance, in compliance with current laws and regulations.
c) Make sure that, if the boiler is connected to existing ue ducts, these have been thoroughly cleaned as residual products of combustion
may detach from the walls during operation and obstruct the ow of fumes.
d) To ensure correct operation and maintain the warranty, observe the following precautions:
1. DHW circuit:
1.1. If the water is harder than 20 °F (1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate dispenser or an
equivalent treatment system, compliant with current regulations.
1.2. oroughly ush the system aer installation of the appliance and before use.
2. Heating circuit
2.1. new system
Before proceeding with installation of the boiler, the system must be cleaned and ushed to eliminate residual thread-cutting
swarf, solder and any solvents, using suitable proprietary products. To avoid damaging metal, plastic and rubber parts, only use
neutral cleaners, i.e. non-acid and non alkaline. Recommended cleaning products are: SENTINEL X300 or X400 and FERNOX
Regenerator for heating circuits. Use these products in strict compliance with the manufacturers’ instructions.
2.2. existing plant:
Before installing the boiler, drain the system and clean it to remove sludge and contaminants, using suitable proprietary products
as described in section 2.1. To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-
alkaline such as SENTINEL X100 and FERNOX Protector for heating circuits. Use these products in strict compliance with the
manufacturers’ instructions. Remember that the presence of foreign bodies in the heating system can adversely aect boiler
operation (e.g. overheating and excessive noise of the heat exchanger).
Failure to observe the above will render the guarantee null and void.
1. INSTRUCTIONS PRIOR TO INSTALLATION
Initial lighting of the boiler must be carried out by an authorised Service Engineer who must rst ensure that:
a) the rated data correspond to the supply (electricity, water and gas) data;
b) the installation complies with current laws and regulations;
c) the appliance is correctly connected to the power supply and earthed.
e names of the authorised Service Centres are indicated in the attached sheet.
Failure to observe the above will render the guarantee null and void.
Prior to commissioning, remove the protective plastic coating from the boiler. Do not use any tools or abrasive detergents to do this as
you may damage the painted surfaces.
e instructions shall state the substance of the following:
is appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack
of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person
responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
2. INSTRUCTIONS PRIOR TO COMMISSIONING

4C607215 - GB
INSTRUCTIONS FOR USERS
3. COMMISSIONING THE BOILER
To light the boiler correctly, proceed as follows:
1) power the boiler
2) open the gas tap;
3) press button on the climate controller (gure 1) to set the boiler operating mode (see section 3.2.).
NOTE: if the SUMMER ( ), mode is set, the boiler will only light during a DHW demand.
 section 3.3.
Figure 1
0609_1901
Summer - Winter - Heating
only - O enable
DHW temperature
adjustment
Information and Programming Timer
Ambient temperature
adjustment
Conrm
Programmed operating mode setting
(Heating) Manual/Automatic/O
Economy – Comfort
Daily programming histogram
Operating mode at comfort
temperature
Operating mode at economy
temperature
Communication in progress
between board and remote control
Flame modulation level
(boiler power)
Malfunction during burner lighting
Burner lighting
Board parameter
Battery level
Days of the
week
Time format / information
display
DHw mode
Heating mode
Standby
Automatic function
Manual function
Timer mode enabled
0609_1902
{
{
{

5C607215 - GB
INSTRUCTIONS FOR USERS
4 dierent boiler modulation levels are shown on the climate con-
troller display during boiler operation, as indicated in gure 2.
0605_1802
Figure 2
Press this button to set the following boiler operating modes:




In SUMMER mode, the display shows . e boiler satises requests for DHW only while central heating is NOT enabled (ambient
frost protection function active).
In WINTER mode, the display shows e boiler satises requests for both DHW and central heating (ambient frost protection
function active).
In  mode, the display shows e boiler satises requests for central heating only (ambient frost protection fun-
ction active).
In OFF mode, the display shows neither of the above two symbols ( ) ( ) In this mode only the ambient frost protection function
is enabled, any other request for DHW or heating is not satised.
3.2 DESCRIPTION OF BUTTON 
Press this button to set one of the following heating functions:
AUTOMATIC-MANUAL-OFF as described below.
AUTOMATIC (symbol displayed )
is function enables hourly boiler programming in the heating mode. Heat demand depends on the hourly programming setting (ambient
temperature COMFORT “ ” or ambient temperature ECONOMY “ ” See section 3.6 for hourly programming settings.
MANUAL (symbol displayed )
is function disables hourly programming and the boiler works in the heating mode at the ambient temperature set by pressing +/- .
OFF (symbol displayed )
If the climate controller is set to “O”, the display shows the symbol and operation in the heating mode is disabled (the ambient anti-
freeze function remains active).
3.3 DESCRIPTION OF BUTTON (AUTOMATIC-MANUAL-OFF)
3.1 MEANING OF THE SYMBOL

6C607215 - GB
INSTRUCTIONS FOR USERS
3.4 AMBIENT TEMPERATURE AND DHW TEMPERATURE ADJUSTMENT
Adjust the ambient temperature ( ) and the DHW temperature ( ), buttons (gure 1).
e ignition of the burner is shown on the display with the symbol ( ) as described in section 3.1.
HEATING
While the boiler is operating in the heating mode, the display shows the symbol ( ) and the ambient temperature (°C) (see
gure 1).
During manual ambient temperature adjustment, the display shows “AMB”.
DOMESTIC HOT WATER
While the boiler is operating in the DHW mode, the display shows the symbol ( ) and the ambient temperature (°C) (see
gure 1). During manual DHW temperature adjustment, the display shows the “HW SP”.
NOTE: If a storage boiler is connected, while the boiler is operating in the DHW mode, the display shows the symbol ( ) and the ambient
temperature (°C)..
3.4.1. Climate controller installed in the boiler
If the climate controller is installed in the boiler, press +/- to adjust the delivery temperature of the heating system water.
e temperature displayed is the ambient temperature.
DATE-TIME SETTINGS
Press IP: the display shows PROG (for a few seconds) and the hour starts ashing.
NOTE: if no button is pressed, the function automatically stops aer about 1 minute.

  +/- to adjust the hours;
 
  +/- to adjust the minutes;
 
  +/- to set the day of the week “Day”
(1…7 corresponding to Monday…Sunday);
Press IP to exit DATE-TIME settings.
To enable hourly programming in the heating mode, press (the symbol appears on the climate controller display).
Hourly programming allows you to set the automatic boiler operation in the heating mode during determined time
bands and determined days of the week.
Boiler settings can be made for single days or for groups of consecutive days.
3.6.1. Single days
4 time bands are available every day (4 boiler switching on and switching o cycles in the heating mode, with times that can dier
from day to day), as indicated in the following table:


7C607215 - GB
INSTRUCTIONS FOR USERS
To set a single time band, proceed as follows:
1) press IP and then ;
2) select a day of the week (1 ... 7) by pressing +/- repeatedly;
3) press OK;
4) the display shows on 1 and the four time digits start ashing, as shown
in the following gure;
5) press +/- to set the boiler switching on time;
6) press OK;
7) the display shows of 1 and the four time digits start ashing;
8) press +/- to set the boiler switching o time;
9) press OK;
10) repeat the operations from point 4 onwards to set the remaining three
time bands;
11) press IP to exit the function.
0608_2802

On 1 Of 1 On 2 Of 2 On 3 Of 3 On 4 Of 4
  (Monday)
06:00 08:00 11:00 13:00 17:00 23:00 24:00 24:00
  (Tuesday)
  (Wednesday)
  (ursday)
  (Friday)
  (Saturday)
  (Sunday)
0802_2501
NOTE: If switching on time on ... is set at the same time as switching o time of ... the time band is cancelled and the programme
moves on to the next time band.
(e.g. on1 = 09:00 - of1 = 09:00 the programme “skips” time band 1 and continues to on2...).
Programming
in HEATING
PROGRAMMED TIME BAND
09:00 - 12:00
Day of the week


8C607215 - GB
INSTRUCTIONS FOR USERS
Summary of available groups of days

“MO-FR”  Monday to Friday As per table in section 3.6.1.
“SA-SU”  Saturday and Sunday 07:00 – 23:00
“MO-SA”  Monday to Saturday As per table in section 3.6.1.
“MO-SU”  Every day in the week As per table in section 3.6.1.
3.6.2. Groups of days
is function allows you to programme 4 shared boiler switching on and switching cycles for several days or for the whole week (see
summary below).
To set a single time band, proceed as follows:
1) Press IP and then ;
2) a GROUP of days by pressing +/- ;
3) Press OK;
4) repeat the operations from points 4 to 10 of section 3.6.1.

is function allows you to programme 4 boiler time bands in the
DHW mode during the week (the programmed time bands are
identical for every day of the week).
To set hourly programming in the DHW mode, proceed as
follows:
1) press IP and then to access programming (heating and DHW);
2) select the DHW programme “HW PR” by pressing +/-
repeatedly;
3) press OK:
4) set the time bands in which DHW is to be made available by repeating
the operations from points 4 to 10 of section 3.6.1 (factory setting
06:00 - 23:00).
0608_2803
IMPORTANT: to enable weekly programming, the tter must set the parameter “HW PR” = 2, as described in section 20.1.

9C607215 - GB
INSTRUCTIONS FOR USERS
0802_2502
4. SPECIAL FUNCTIONS

is function is used to set two dierent ambient temperature values:
Economy / Comfort.
For the sake of simplicity, make sure ECONOMY is at a lower temperature than COMFORT.
To set the required ambient temperature, press :
 ECONM” indicates that ambient temperature is set to economy:
the display shows the symbol ;
 COMFR” indicates that the ambient temperature is set to comfort:
the display shows the symbol ;
To temporarily change the ambient temperature, press +/- or see section 4.3. is function can be manual or auto- matic, as de-
scribed below:
AUTOMATIC OPERATION (symbol on display )
e ambient temperature setting depends on the time band (section 3.6). e ambient temperature is set to COMFORT inside the time
band while it is set to ECONOMY outside the time band.
Press to temporarily change ambient temperature (from COMFORT to ECONOMY and vice-versa) until the next set time band
change.
MANUAL OPERATION (symbol on display )
Press and set the boiler to manual.
Press to change ambient temperature (from COMFORT to ECONOMY and vice-versa) until the next time the button is pres-
sed.
Programming
in HOT WATER
PROGRAMMED TIME BAND
09:00 - 12:00
Days of the week

10 C607215 - GB
INSTRUCTIONS FOR USERS
e shower function optimises DHW control, for example, when someone is taking a shower.
e function delivers DHW at a lower than rated temperature.
To modify the maximum temperature of the shower function, proceed as described in section 4.3.
is function can be manually enabled as follows:
 +/- ( ) and then to enable the function
SHOWR appears on the display for a few seconds followed by HW SS);
 OK while the delivery temperature and the symbol ashes on the display;
 60 minutes (the symbol ashes during this time.
At the end of this period, DHW temperature returns to that of the operating mode set before the function activated (the symbol
not longer ashes on the display).
NOTE: to disable the function before the 60 minute period terminates, proceed as follows:
 +/- ( ) and then ;
 OK the display visualises the message “HW S^”.
4.2 SHOWER FUNCTION
To change the temperature value, proceed as follows:
 IP to enable the PROG function;
  to scroll the functions to modify, as described in the following table:
Function Display Description of function
COMFR
e set temperature ashes
(factory value = 20°C)
Boiler in heating mode at rated temperature.
ECONM
e set temperature ashes
(factory value = 18°C)
Boiler in heating mode at reduced temperature
NOFRS
e set temperature ashes
(factory value = 5°C)
Boiler in heating mode at preset antifreeze ambient temperature
SHOWR
e set temperature ashes
(factory value = 40°C)
. Boiler in DHW mode at the preset temperature
 +/- ;
 IP.
4.3 CHANGE TEMPERATURE VALUES OF THE FUNCTIONS ASSOCIATED WITH THE BUTTON

is function allows you to disable hourly programming (section 3.6) for a certain period of time. During this time, mini- mum ambient
temperature is assured (factory setting 5°C). is setting may be modied as described in section 4.3 under “NOFRS”.
To enable the function, proceed as follows:
  and set the “AUTO” function (symbol );
  MM 60 appears on the display and the symbols ash.
4.4 TIMER FUNCTIONS BUTTON )

11 C607215 - GB
INSTRUCTIONS FOR USERS
Press +/- to adjust the duration of the function, the adjustment step is 10 minutes. Duration ranges from 10 minutes
to a maximum of 45 days.
Press +aer 90 minutes, HH 02 appears on the display:
In this case, the time is considered in hours. Duration ranges from 2 to 47 hour.
Press +aer 47 hours, DD 02 appears on the display:
In this case, the time is considered in days. e duration ranges from 2 to 45 days (the adjustment step is 1 day).
OK to enable the function and exit the programming mode
WARNING
aer enabling this function, make sure not to press any other button. If one of the buttons on the climate controller is
pressed, in fact, the manual function may be enabled ashes on the display) and the “Timed shutdown” function is interrupted. In this
case, repeat the function enable procedure as described at the beginning of this section.

is function is used to set a temporary ambient temperature. Aer this period, the operating mode returns to the previously set one.
To enable the function, proceed as follows:
  and set the “MAN” function (symbol ( );
  MM 60 appears on the display and the symbols ash;
 
 AMB” appears on the display) and then +/- .
0610_0201
In this example, the function lasts 60 minutes
IMPORTANT: Regularly check that the pressure displayed on the pressure gauge (Figure 3) is 0.7 - 1.5 bar, with the boiler cold.
In case of overpressure, open the boiler drain tap. In case of insucient temperature, open the boiler lling tap (gure 3).
Open the tap very slowly in order to vent the air.
During this operation the boiler must be “OFF” (press - gure 1).
NOTE: the boiler is equipped with a hydraulic pressure switch which blocks its operation in the event of lack of water.
In case pressure drops occur frequently, have the boiler checked by an authorised Service Engineer.


12 C607215 - GB
INSTRUCTIONS FOR USERS
To switch o the boiler, disconnect the electric power supply. With the gas boiler in “OFF” mode (section 3.2), the electric circuits remain
powered and the anti-freeze function is enabled (section 8).
6. TURNING OFF THE BOILER
e climate controller sends two types of signals: FAULT and BLOCK.
FAULT
In the presence of a fault the display shows the symbols and the ashing <ERROR>
message.
e fault is identied with an error code followed by a letter and cannot be reset by the user.
Call the authorised Service Centre.
0606_2207
9. TROUBLESHOOTING
7. GAS CONVERSION
e boilers can operate both on natural gas and LPG.
All gas conversions must be made by an authorised Service Engineer.
Do not drain the whole system as lling up with water again causes unnecessary and harmful scale to build up inside the boiler and the
heating elements. If the boiler is not used during winter and is therefore exposed to the danger of frost, add some specic anti-freeze to
the water in the system (e.g.: propylene glycol coupled with corrosion and scale inhibitors). e electronic boiler management system
includes a “frost protection” function for the heating system which, when delivery temperature falls below 5°C, operates the burner until
a delivery temperature of 30°C is reached.
e frost protection function is enabled if:
* the boiler is electrically powered;
* the gas tap is open;
* the system is at the correct pressure;
* the boiler is not blocked.
8. PROLONGED SHUTDOWN. FROST PROTECTION
0702_1201 / CG_1891
System lling tap Boiler drain tap
Figure 3
System drain tap

13 C607215 - GB
INSTRUCTIONS FOR USERS
BLOCK
In the presence of a block, the display
shows the symbols the ashing letters
>>>OK which ash alternately (about eve-
ry 2 seconds) with the <ERROR> message.
e block is identied by an error code fol-
lowed by the letter E.
Press OK to reset the electronic board and
restore operation.
e display shows the message <RESET>
and then the message >>>OK.
0608_2805 0812_1904
To keep the boiler ecient and safe, have it checked by the authorised Service Centre at the end of every operating period. Careful servicing ensures
economical operation of the system.
Do not clean the outer casing of the appliance with abrasive, aggressive and/or easily ammable cleaners (e.g.: petrol, alcohol, and so on). Always
switch o the appliance before cleaning it (see section 6 “Switching o the boiler”).
10. ROUTINE MAINTENANCE INSTRUCTIONS
Error code
01e
02e
03e
04e
05e
06e
11e
12e
13e
25e
31e
35e
80e-96e
98e
99e
Description of fault
Failed ignition shutdown
Safety thermostat tripped
Flue thermostat/ ue pressure switch tripped
Safety error for frequent losses of ame
Delivery probe failure
DHW sensor fault
Tripping of safety thermostat for system at low temperature
(if connected)
Lack of consent from hydraulic dierential pressure switch
Hydraulic dierential pressure switch contact faulty
Safety intervention for no water circulation
Communication error between electronic board and climate
controller
Parasite ame (amer error)
Climate controller internal error
Board internal error
Board internal error
Corrective action
Press OK. If this fault occurs repeatedly, call the authorised service
centre.
Press OK. If this fault occurs repeatedly, call the authorised service
centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
Check that the pressure in the system is correct. See section 5. If this
fault persists, call the Authorised Service Centre.
Check that the pressure in the system is correct. See section 5. If this
fault persists, call the Authorised Service Centre.
Call the Authorised Service Centre.
Press OK. If this fault occurs repeatedly, call the authorised service
centre.
Press OK. If this fault occurs repeatedly, call the authorised service
centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
2 seconds

14 C607215 - GB
INSTRUCTIONS FOR FITTERS
is boiler has been designed to heat water to a temperature lower than boiling point at atmospheric pressure. It must be connected to
a central heating system and to a domestic hot water supply system according to its performance and power output.
Do the following before connecting the boiler:
a) Make sure that the boiler is adjusted to use the type of gas delivered by the gas supply. To do this, check the markings on the packaging
and the rating plate on the appliance.
b) Make sure that the ue terminal dra is appropriate, that the terminal is not obstructed and that no exhaust gases from other appliances
are expelled through the same ue duct, unless the latter has been specially designed to collect exhaust gas from more than one
appliance, in compliance with current laws and regulations.
c) Make sure that, if the boiler is connected to existing ue ducts, these have been thoroughly cleaned as residual products of combustion
may detach from the walls during operation and obstruct the ow of fumes.
To ensure correct operation and maintain the warranty, observe the following precautions:
1. DHW circuit:
1.1. If the water is harder than 20 °F (1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate dispenser or an
equivalent treatment system, compliant with current regulations.
1.2. oroughly ush the system aer installation of the appliance and before use.
2. Heating circuit
2.1. new system
Before proceeding with installation of the boiler, the system must be cleaned and ushed to eliminate residual thread-cutting
swarf, solder and any solvents, using suitable proprietary products. To avoid damaging metal, plastic and rubber parts, only use
neutral cleaners, i.e. non-acid and non alkaline. Recommended cleaning products are: SENTINEL X300 or X400 and FERNOX
Regenerator for heating circuits. Use these products in strict compliance with the manufacturers’ instructions.
2.2. existing plant:
Before installing the boiler, drain the system and clean it to remove sludge and contaminants, using suitable proprietary products
as described in section 2.1. To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-
alkaline such as SENTINEL X100 and FERNOX Protector for heating circuits. Use these products in strict compliance with the
manufacturers’ instructions. Remember that the presence of foreign bodies in the heating system can adversely aect boiler
operation (e.g. overheating and excessive noise of the heat exchanger).
Failure to observe the above will render the guarantee null and void.
e following notes and instructions are addressed to tters to allow them to carry out trouble-free installation. Instructions for lighting
and using the boiler are contained in the ‘Instructions for Users’ section.
Additionally, bear in mind the following:
 
sections as usual, though, bearing in mind the available ow-head at the plate, as shown in section 26.
 
 
Failure to observe the above will render the guarantee null and void.
11. GENERAL INFORMATION
12. INSTRUCTIONS PRIOR TO INSTALLATION

15 C607215 - GB
INSTRUCTIONS FOR FITTERS
13. INSTALLING THE BOILER
Aer deciding the exact location of the boiler, x the template to the wall.
Connect the system to the gas and water inlets present on the lower bar of the template. Fit two G3/4 taps (delivery and return) on the
central heating circuit; these taps make it possible to carry out important operations on the system without draining it completely. If
you are either installing the boiler on an existing system or replacing one, as well as the above, t a settling tank under the boiler on the
system return line in order to collect any deposits and scale circulating in the system aer ushing. Aer xing the boiler to the template,
connect the ue and air ducts, supplied as accessories, as described in the following sections.
If installing the boiler with natural draught models 240 i - 280 i make the connection to the ue using a metal pipe which, over time, will
resist normal mechanical stress, heat and the action of the combustion products and any condensate they form.
14. DIMENSIONS OF BOILER
971125_0201
Figura 4
1: G 1/2 DHW outlet
2: G 1/2 cold domestic water inlet
3: G 3/4 heating return
4: G 3/4 heating delivery
5: G 3/4 gas inlet to boiler
020418_1000
DISCHARGE AXIS WITH COAXIAL CURVE
Drill with a Ø 12 bit, fit the rawlplugs and the hooks provided
BOILER WIDTH 60
DHW INLET
DHW OUTLET HEATING RETURN HEATING DELIVERY GAS INLET
FORCED FLOW DISCHARGE AXIS
BOILER HEIGHT 950
Figure 5
0609_0504 / CG_1848
140 Fi - 240 Fi - 280 Fi - 320 Fi 240 i - 280 i

16 C607215 - GB
INSTRUCTIONS FOR FITTERS
15. CONTENTS OF PACK
 





Figure 6
0702_1202 / CG_1892
16. INSTALLING THE FLUE AND AIR DUCTS
e boiler is easy and exible to install thanks to the extensive range of available accessories,
as described below. e boiler has been designed for connection to a vertical or horizontal
coaxial ue-air duct. A splitting kit is also available if separate ducts are required.
Only accessories supplied by the manufacturer must be used for installation!
… Coaxial ue-air duct (concentric)
is type of duct is used to discharge exhaust fumes and draw combustion air both outside
the building and if a LAS ue is tted.
e 90° coaxial bend allows the boiler to be connected to a ue-air duct in any direction
as it can be rotated by 360°. It can also be used as a supplementary bend combined with a
coaxial duct or a 45° bend.
WARNING
To optimise operating safety, make sure the ue ducts are rmly xed to
the wall with suitable brackets.
911231_5500
Figure 7
2 1
MAX. INLET
LENGTH DIAPHRAGM A
(m) (mm)
0 ÷ 2,5 73
2,5 ÷ 5 NO
0 ÷ 0,5 73
0,5 ÷ 2 80
2 ÷ 4 NO
0 ÷ 1 76
1 ÷ 4 NO
0 ÷ 1 80
1 ÷ 3 NO
NUVOLA 3 240 Fi
NUVOLA 3 280 Fi
Figure 8
BOILER MODEL
If fumes are discharged outside the building, the ue-air duct must protrude at least 18 mm from the wall to allow an aluminium we-
athering surround to be tted and sealed to avoid water inltrations. Make sure there is a minimum upward slope towards the outside
of 1 cm per metre of duct.
a 90° bend reduces total duct length by 1 metre.
a 45° bend reduces total duct length by 0.5 metres.
0712_0801
Connector
Concentric ad
A
NUVOLA 3 320 Fi
NUVOLA 3 140 Fi

17 C607215 - GB
INSTRUCTIONS FOR FITTERS
16.1 HORIZONTAL FLUE INSTALLATION OPTIONS
0612_0201
L max = 4 m
L max = 5 m - 140 Fi
L max = 3 m - 320 Fi
L max = 8 m Ø 80/125 mm
L max = 4 m
L max = 5 m - 140 Fi
L max = 3 m - 320 Fi
L max = 8 m Ø 80/125 mm
L max = 3 m
L max = 4 m - 140 Fi
L max = 2 m - 320 Fi
L max = 7 m Ø 80/125 mm
L max = 3 m
L max = 4 m - 140 Fi
L max = 2 m - 320 Fi
L max = 7 m Ø 80/125 mm
16.2 LAS FLUE DUCT INSTALLATION OPTIONS
0607_0601
L max = 4 m
L max = 5 m - 140 Fi
L max = 3 m - 320 Fi
L max = 8 m Ø 80/125 mm
16.3 VERTICAL FLUE INSTALLATION OPTIONS
is type of installation can be carried out on either a at or a pitched roof by tting a ue terminal and a special weathering surround
with sleeve (both available on request.
0802_2503
L max = 4 m L max = 4 m L max = 2 m L max = 3 m

18 C607215 - GB
INSTRUCTIONS FOR FITTERS
For detailed installation instructions, consult the technical data provided with the accessories.
… separate ue and air ducts
is type of installation makes it possible to discharge exhaust fumes both outside the building and into single ue ducts. Comburent
air can be drawn in at a dierent location from that of the ue terminal. e splitting kit comprises a ue duct adaptor (100/80) and an
air duct adaptor. For the air duct adaptor, t the screws and seals previously removed from the cap.
e diaphragm in the boiler must be removed in the event of installation with these types of ducts.
• A 90° bend reduces total duct length by 0.5 metres.
• A 45° bend reduces total duct length by 0.25 metres.
Figure 10

is regulator must be adjusted to optimise combustion eciency and parameters. Aer turning the air intake connecter, which can be
mounted both to the right and the le of the exhaust ue duct, suitably adjust the excess air according to the total length of the combu-
stion exhaust and inlet ue ducts.
0802_2504 / (CG_2022)
0812_1905
0604_2001
NUVOLA 140 Fi
NOTE: e rst 90° bend is not included
when calculating the maximum available
length.
e 90° bend allows the boiler to be con-
nected to a ue-air duct in any direction as
it can be rotated by 360°. It can also be used
as a supplementary bend combined with a
duct or a 45° bend.
Model 240-280 Model 320
Turn this regulator clockwise to decrease the excess of comburent air and
vice versa to increase it.
To ne tune, use a combustion product analyser to measure the amount
of CO2 in the fumes at maximum heat capacity, and, if a lower value is
measured, gradually adjust the air regulator until the amount of CO2 in-
dicated in the following table is measured. To mount this device correctly,
consult the relative instructions.
Index
Opening
Intake coupling
Figure 9
0805_2101 / CG_2023
135 minimum

19 C607215 - GB
INSTRUCTIONS FOR FITTERS
MAX LENGTH POSITION OF CO2%
AIR REGULATOR
  m AFR G20 G30 G31
0 ÷ 10 1
10 ÷ 20 2
20 ÷ 30 3
0 ÷ 20 1
20 ÷ 30 2
0 ÷ 20 1
20 ÷ 30 2
0 ÷ 10 3
10 ÷ 25 4
NUVOLA3 COMFORT 240 Fi6,1 8,7 8,7
NUVOLA3 COMFORT 280 Fi7,1 8,0 8,0
16.4 SEPARATE HORIZONTAL FLUE TERMINALS INSTALLATION OPTIONS
IMPORTANT  Make sure there is a minimum downward slope towards the outside of 1 cm per metre of duct length. If the con-
densate collection kit is installed, the discharge duct must slope down towards the boiler.
(L1 + L2) max = 30 m
(L1 + L2) max = 25 m for model 320 Fi
911231_4805
L max = 10 m
911231_4806
NB: For the C52 type, do not t the ue and air duct terminals on opposite walls of the building. e air duct (for horizontal discharges)
must have a maximum length of 10 metres (6m for model 140 Fi).
If the discharge duct is longer than 6 metres, install the condensate collection kit, supplied as an accessory, near the boiler.
IMPORTANT: if tting a single ue duct, make sure it is adequately insulated (e.g.: with glass wool) wherever the duct passes
through building walls. For detailed installation instructions, consult the technical data provided with the accessories.
NUVOLA3 COMFORT 140 Fi4,0 — 4,3
NUVOLA3 COMFORT 320 Fi6,7 — 7,6

20 C607215 - GB
INSTRUCTIONS FOR FITTERS
16.5 SEPARATE VERTICAL FLUE INSTALLATION OPTIONS
L max = 15 m
911231_4701
17. ELECTRICAL CONNECTIONS
is machine is only electrically safe if it is correctly connected to an ecient earth system in compliance with current safety regula-
tions.
Connect the boiler to a 230V single-phase earthed power supply using the supplied three-pin cable, observing correct LIVE-NEUTRAL
polarity.
Use a double-pole switch with a contact separation of at least 3 mm.
When replacing the power supply cable, t a harmonised HAR H05 VV-F’ 3x0.75mm2 cable with a maximum diameter of 8 mm.
…Access to the power supply terminal block
 
 
 
 


(L) = Live (brown)
(N) = Neutral (blue)
= Earth (yellow-green)
(1) (2) = Contact for ambient thermostat
IMPORTANT:LN
Figure 11
0609_0602 / CG_1853
WARNING: If the appliance is directly connected to an underoor system, install a safety thermostat to prevent the latter from
overheating.