Nova Florida VELA COMPACT Instruction and safety manual

CTN 24/RTN 24 CTFS 24/RTFS 24
CTFS 28/RTFS 28
INSTALLATION
USE AND MAINTENANCE
GB
IST 04 C 167 - 02
VELA
COMPACT

2
Dear Customer,
Thank you for choosing and buying one of our boilers. Please read these instructions carefully in order to install, operate, and
maintain this equipment properly.

3
General information for fitters, maintenance technicians and users
T
his INSTRUCTION MANUAL, which is an inte
g
ral and indispensable part of the product, must be handed over to the user by the
i
nstaller and must be kept in a safe place for future reference. The manual must accompan
y
the boiler should it be sold or its pos
-
s
ession trans
f
erred. Following the boiler installation, the

tter is to advise the user about boiler operation and its sa
f
ety devices
T
his boiler must be used for the
p
ur
p
oses for which it has been intended. An
y
other use shall be considered incorrect and
th
ere
f
ore
d
angerous.
T
he boiler must be installed by qualied personnel, in compliance with applicable laws and standards and accordin
g
to the manu
-
f
acturer’s instructions given in this manual. Incorrect installation may cause injury to persons and
/
or animals and damage to proper
-
t
y. The manufacturer shall not be held liable for any such injury and/or dama
g
e.
D
amage and
/
or injury caused by incorrect installation or use and
/
or damage and
/
or injury due to non-observance of the manufac
-
t
urer’s instructions shall relieve the manufacturer from an
y
and all contractual and extra-contractual liabilit
y
.
B
e
f
ore installing the boiler, check that the technical data correspond to the requirements
f
or its correct use in the system.
C
heck that the boiler is intact and it has not been dama
g
ed durin
g
transport and handlin
g
. Do not install equipment which is dama
-
g
ed and
/
or faulty.
D
o not obstruct the air suction and/or heat dissipation openin
g
s.
O
nly manufacturer approved and supplied accessories or optional kits (includin
g
electric ones) are to be installed.
P
roperly dispose o
f
the packaging as all the materials can be recycled. The packaging must there
f
ore be sent to speci

c waste
m
ana
g
ement sites.
K
eep the packaging out o
f
the reach o
f
children as it may represent a choking and su
ff
ocation hazard.
I
n the event of failure and/or faulty functionin
g
, switch off the boiler. Do not attempt to make repairs: contact qualied technicians.
M
anufacturer a
pp
roved and su
pp
lied
p
arts must be used for all re
p
airs to the boiler.
N
on-observance o
f
the above requirements may a
ff
ect the sa
f
ety o
f
the boilers and endanger people, animals and property.
T
he manufacturer, in order to
g
uarantee efficient and correct functionin
g
of the equipment, recommends the boiler to be
s
erviced and repaired by an authorized
S
ervice
C
entre.
R
outine boiler maintenance is to be performed accordin
g
to the schedule indicated in the relevant section of this manual.
A
ppropr
i
ate
b
o
il
er ma
i
ntenance ensures e
ffi
c
i
ent operat
i
on, env
i
ronment preservat
i
on, an
d
sa
f
ety
f
or peop
l
e, an
i
ma
l
s an
d
o
b
j
ects.
I
n the event o
f
long periods o
f
inactivity o
f
the boiler, disconnect it
f
rom the power mains and close the gas tap.
W
arnin
g
! Should power mains be disconnected, boiler electronic anti-freeze function will not be operative.
S
hould there be a risk of freezing, add antifreeze: it is not advisable to empty the system as this may result in damage; use specic
a
nti-freeze products suitable for multi-metal heatin
g
systems.
I
MP
O
RTANT
I
f you smell
g
as:
-
do not turn on or off electric switches and do not turn on electric a
pp
liances;
-
do not ignite

ames and do not smoke;
-
close the main
g
as tap;
-
o
p
en doors and windows;
-
contact a
S
ervice
C
entre, a qualified installer or the gas supply company.
N
ever use flames to detect
g
as leaks.
T
he boiler is desi
g
ned for installation in the country indicated on the technical data plate: installation in any other
c
ountry may be a source of dan
g
er for people, animals and property.

4
CONTENTS
General information for the Installer, Maintenance Technician and User Page 3
1. Instructions for the User Page 6
1.1 Control panel Page 6
1.2 Operating the boiler Page 7
1.2.1 Switching on Page 7
1.2.2 Operation Page 7
1...3 Boiler shut-down Page 8
1.3.1 Burner shut-down Page 8
1.3.2 Shut-down due to overheating Page 8
1.3.3 Shut-down due to low water pressure Page 8
1.3.4 Shut-down due to incorrect air/ue gas system draught Page 8
1.3.5 Shut-down due to malfunction of temperature probes Page 8
1.4 Maintenance Page 9
1.5 Notes for the User Page 9
2. Technical characteristics and dimensions Page 10
2.1 Technical characteristics Page 10
2.2 Dimensions Page 11
2.3 Hydraulic layouts Page 13
2.4 Operating data Page 14
2.5 General characteristics Page 15
3. Instructions for the Installer Page 16
3.1 Installation Standards Page 16
3.2 Installation Page 16
3.2.1 Packaging Page 16
3.2.2 Choosing where to install the boiler Page 16
3.2.3 Positioning the boiler Page 17
3.2.4 Installing the boiler Page 18
3.2.5 Boiler room ventilation Page 18
3.2.6 Air intake and ue gas discharge system Page 18
3.2.6.1 Natural draught boiler Page 18
3.2.6.2 Forced draught boiler Page 20
3.2.6.2.1 Conguration of air intake and ue gas discharge ducts Page 20
3.2.6.2.2 Air intake and ue gas discharge system via 100/60 mm coaxial pipes Page 21
3.2.6.2.3 Air intake and ue gas discharge system via 80/80 mm split pipes Page 22
3.2.7 Checking combustion efciency Page 23
3.2.7.1 Coaxial pipe system Page 23
3.2.7.2 Split pipe system Page 23
3.2.8 Gas mains connection Page 24
3.2.9 Plumbing connections Page 24
3.2.10 Power mains connection Page 25
3.2.11 Room thermostat connection (optional equipment) Page 25
3.3 Loading the system Page 25
3.4 Starting the boiler Page 26
3.4.1 Preliminary checks Page 26
3.4.2 Switching on and switching off Page 26
3.5 Wiring diagram Page 26
3.6 Adaptation to other gas types and burner adjustment Page 29
4. Testing the boiler Page 30
4.1 Preliminary checks Page 30
4.2 Switching on and switching off Page 30
5. Maintenance Page 31
6. Troubleshooting Page 32

5
PICTURE INDEX
Pic. 1 – Control panel Page 6
Pic. 2 – Loading tap Page 8
Pic. 3 – CTN model dimensions Page 11
Pic. 4 – CTFS model dimensions Page 12
Pic. 5 – CTN model hydraulic layout Page 13
Pic. 6 – CTFS model hydraulic layout Page 13
Pic. 7 – Installation template Page 17
Pic. 8 – Connection to chimney system of CTN model Page 19
Pic. 9 – Dimensions for connection of CTN model to the ue gas discharge duct Page 19
Pic. 10 – Air intake and ue gas discharge coaxial pipe system (CTFS) Page 21
Pic. 11 – Dimensions for connection to air intake and ue gas discharge coaxial pipe system (CTFS) Page 21
Pic. 12 – Air intake and ue gas discharge split pipe system (CTFS) Page 22
Pic. 13 – Dimensions for connection to air intake and ue gas discharge split pipe system (CTFS) Page 22
Pic. 14 – Split pipe system examples Page 23
Pic. 15 – Additional split pipe system examples Page 23
Pic. 16 – Sample areas for combustion efciency measurement Page 23
Pic. 17 – Gas mains connection Page 24
Pic. 18 – Electric layout Page 27
Pic. 19 – Natural gas – Lpg selection jumper Page 29
Pic. 20 – Gas valve adjustment Page 29
CHART INDEX
No. 1 chart – Led signaling – boiler operation status Page 6
No. 2 chart – CTN model adjustment rates Page 14
No. 3 chart – CTFS model adjustment rates Page 14
No. 4 chart – General specications Page 15
No. 5 chart – CTN 24 model combustion rates Page 15
No. 6 chart – CTFS 24 AF model combustion rates Page 15
No. 7 chart – “temperature – nominal resistance” chart of temperature probes Page 28

6
1. Boiler working mode led (multi-color)
See no. 1 chart at the bottom of the page for further details on
color displayed by led in relation to boiler working mode.
2. Boiler working mode led (multi-color)
See no. 1 chart at the bottom of the page for further details on
color displayed by led in relation to boiler working mode.
3. Water pressure gauge
The gauge shows water pressure in the CH system.
4. CH selector and adjusting knob
The knob activates or de-activates CH operation, and adjusts CH
water temperature between a minimum of 35°C and a maximum
of 78°C.
When the knob is set to (fully turned counter-clockwise), the
boiler is set to summer mode and CH operation is de-activated.
4. DHW selector and boiler shutdown reset
The knob sets the boiler to stand-by ( position, fully turned coun-
ter-clockwise), and adjust DHW temperature between a minimum
of 35°C and a maximum of 58°C.
When the boiler has shut down is to be reset by turning the knob
to position.
WARNING
The boiler has a special built-in regulator limiting DHW flow up to
10 liter per minute. In addition to the setting of no. 5 selector,
the temperature of the DHW supplied also depends on the flow
requested by the user and the temperature of the water mains
supply.
1. INSTRUCTIONS FOR THE USER
1.1 CONTROL PANEL
Pic. 1 – Control panel
1
2
3 5
4
No. 1 Chart – Color displayed by led in relation to boiler operation status
LED 1 LED 2
Power connected to boiler n/a GREEN
Flame presence n/a YELLOW
Active CH mode GREEN n/a
Shutdown due to flame absence OFF RED
Flue gas thermostat shutdown (CTN)
Air/flue gas pressure switch shutdown (CTFS) YELLOW OFF
Safety thermostat shutdown RED OFF
Safety thermostat shutdown FLASHING GREEN OFF
Gas valve alarm FLASHING YELLOW OFF
Water pressure switch alarm (>85°) FLASHING RED n/a
CH flow probe alarm FLASHING YELLOW/RED OFF
DHW flow probe alarm FLASHING GREEN/RED OFF
KEY CHART TO ACHRONYMS
OFF LED off
RED LED on, displaying the color stated in the chart
FLASHING RED LED flashing, displaying the color stated in the chart
RED/GREEN LED flashing, displaying in sequence the colors stated in the chart
n/a LED status is not relevant

7
The followin
g
procedures are to be implemented only after the boiler is installed, tested and its installation is certified
by
a
q
ualified fitter.
•
Open the
g
as stop cock.
•
connect
p
ower mains to the boiler
(
no.
2
LED turns on displayin
g
the
g
reen color);
•
choose boiler mode by means o
f
no.
4
selector
(
pic. 1
)
;
•
set the desired central heatin
g
water temperature by means of no.
4
adjustin
g
knob (pic. 1);
•
set the desired domestic hot water temperature by means of no. 5 adjustin
g
knob (pic. 1);
•
set room temperature by means of room thermostat
(
when available
)
.
W
hen CH is required, no. 1 LED turns on (
g
reen ).
W
hen

ame is present no.
2
LED turns on
(
yellow
)
.
S
hould the boiler be left inactive for a lon
g
time, particularly if boiler is lp
g
powered, i
g
nition mi
g
ht be difficult.
B
efore starting the boiler switch on another gas powered device
(
e.g. kitchen range
)
.
B
eware that even by followin
g
that procedure, the boiler mi
g
ht still shut down once or twice.
R
eset the boiler by turnin
g
no. 5 knob to reset
p
osition for a few seconds.
1
.2.2. O
p
eration
T
o prevent
f
requent ignition and switching o
ff
in the heating mode, the boiler has a waiting time o
f
4
m
i
nutes
b
etween su
b
sequent
ig
nitions.
S
hould water temperature in the s
y
stem fall below
4
0
°C, the waitin
g
time is disallowed and the boiler re-i
g
nites.
B
oiler electronics always
g
ives priority to DHW over CH supply.
T
em
p
erature can be ad
j
usted within a
3
5
°C to 58°C ran
g
e.
T
he boiler is tted with a ow-limitin
g
device that allows a maximum DHW ow of 10 liter per minute.
A
vailable DHW liters per minute depend on boiler thermal output and water mains supply temperature, accordin
g
to the followin
g
f
ormula:
l
= DHW lit
e
r =
3
4
0
(
CTFS model
)
o
r
3
1
8/∆t
(
for CTN model
)
∆
t
w
here ∆t = DHW temperature – water mains suppl
y
temperature
E
.g. when water mains supply temperature is 8°
C
and DHW is required at
3
8
°
C
, the value of ∆t is:
∆t
=
3
8
°
C
– 8 °
C
=
3
0
°
C
a
nd DHW liters
p
er minute
)
obtainable at the re
q
uired tem
p
erature of
3
8
°
C
are:
l
=
34
0/
3
0
=
11
.
3
[
liters per minute
]
(
mixed water to the tap - for model
C
TF
S)
.
T
he boiler is equipped with an anti-frost protection s
y
stem which is not active when the boiler is in stand-b
y
mode.
W
hen central heating water temperature sensor detects a water temperature of 5°
C
, the boiler switches on and stays on at its mini
-
m
um heatin
g
output until the temperature of central heatin
g
water reaches
3
0
°C or 15 minutes have ela
p
sed.
S
hould the boiler shut down, pump operation is in any case
g
ranted.
T
he anti-freeze function only protects the boiler and not the central heatin
g
system.
T
he central heatin
g
system must be protected by usin
g
an ambient thermostat, althou
g
h it is disabled when
th
e se
l
ector
i
s set to stan
d
-
b
y.
T
he heatin
g
system can be effectively protected a
g
ainst icin
g
by usin
g
specic anti-freeze products that are suitable for multi-metal
s
ystems. Do not use anti-
f
reeze products
f
or car engines, and check the e
ff
ectiveness o
f
the product used over time.
W
here the boiler is left inactive and still connected to
p
ower the
p
um
p
is activated for
3
0
seconds ever
y
24
hours to
p
revent seizure.
1.2 Operating the Boiler
1.2.1 Switching On

8
1
.
3
. B
o
il
e
r
s
h
u
t-
do
wn
W
hen any mal
f
unction occurs, the boiler automatically shuts down.
R
efer to no. 1 chart (on pa
g
e 6) in order to detect the boiler operation status.
I
n order to identi
f
y plausible mal
f
unction origin, see no.
6
paragrap
h
“T
rou
bl
es
h
oot
i
ng
”
at the end o
f
the manual.
I
n relation to the type o
f
mal
f
unction, proceed as described herea
f
ter.
1
.
3
.1.
B
urner s
h
ut-
d
own
W
hen the burner shuts down
,
no.
2
LED turns on
(
red
)
. Should this ha
pp
en
p
roceed as follows:
- Check the gas stopcock to be open, and gas mains have gas in them e.g. by lighting a kitchen range burner;
-
O
nce gas presence is veried, reset the burner by turning no. 5 selector
(
pic. 1
)
to its reset position : i
f
the equipment does not
r
estart and shuts down a
g
ain, after performin
g
two attempts, contact an authorized Service Centre or qualied personnel for service.
S
hould the burner shut down frequently, signaling a recurrent operation malfunction contact an authorized
S
ervice
C
entre or qualied
p
ersonnel
f
or service.
1
.3.2.
S
hut-down due to overheating
W
hen central heatin
g
ow overheats, no. 1 LED (pic. 1) ashes (red). Should that happen, contact an authorized Service Centre or
q
uali

ed personnel to carry out maintenance work.
1
.3.3. Shut-down due to low water
p
ressure
I
n case of shutdown due to water pressure switch intervention, no. 1 LED ashes
(
yellow
)
.
F
ill up the boiler by openin
g
the loadin
g
tap A (pic.
2
)
, located in the lower area of the boiler, next to the h
y
draulic connections.
W
ater pressure must
b
e 1-1.
3
b
ars w
hil
e t
h
e
b
o
il
er
i
s co
ld
.
I
n order to restore water
p
ressure,
p
roceed as follows:
-
Turn the lling tap counter-clockwise to let water into the boiler and keep it open until no. 5 pressure gauge
(
pic. 1
)
shows that a
p
ressure o
f
1-1,
3
b
ars
i
s reac
h
e
d
; now c
l
ose t
h
e tap
b
y rotat
i
ng
i
t c
l
oc
k
w
i
se.
S
hould boiler shuts down frequently occur it means there is boiler malfunction in progress.
C
ontact qualied personnel or an authori
-
z
ed
S
ervice
C
entre for maintenance.
O
nce the system is filled, close the tap properly. If the tap is not properly closed, as pressure increases,
b
o
il
er sa
f
ety va
l
ve may open an
d
water
fl
ow out.
1
.3.4
S
hut-down due to flue system incorrect draught
S
hould the boiler shut down due to an anomaly in the air intake and
/
or ue gas discharge system, no. 1 LED
(
pic. 1
)
turns on
(
yellow
)
.
S
hould that occur, contact an authorized
S
ervice
C
entre or qualied personnel for maintenance.
1
.3.5
S
hut-down due to malfunction of temperature probes
S
hould the burner shut down due to a malfunction of the tem
p
erature
p
robes, no. 1 LED
(p
ic. 1
)
ashes as follows:
-
yellow
/
red for
C
H probe;
-
red/
g
reen for DHW probe.
W
hen that happens, contact an authorized
S
ervice
C
entre or qualied personnel to carry out maintenance.
Pic. 2 - Loading tap

9
1
.4. M
a
int
e
n
a
n
ce
Have routine boiler maintenance performed accordin
g
to the schedule indicated in the relevant section of this manual
.
A
ppropr
i
ate
b
o
il
er ma
i
ntenance ensures e
ffi
c
i
ent operat
i
on, env
i
ronment preservat
i
on, an
d
sa
f
ety
f
or peop
l
e, an
i
ma
l
s an
d
o
bj
ects.
O
nly qualified personnel are to service the boiler.
The manufacturer recommends
C
ustomers to contact authorized
S
ervice
C
enters for maintenance and repairs, they are best qualified
f
or that
p
rocedure
.
T
he user may only clean the external casin
g
of the boiler, employin
g
common household products.
D
o not use water
!
1
.5.
N
otes
f
or t
h
e
U
ser
T
he user may only access boiler parts which can be reached without using technical equipment and
/
or tools: therefore the user is not
a
uthorized to remove the boiler casin
g
and act upon inside components.
N
obody, including quali

ed personnel, is authorized to modi
f
y the boiler.
T
he manu
f
acturer shall not be held responsible
f
or damage to people, animals, or property due to tampering or improper intervention
to
th
e
bo
il
e
r.
W
hen the boiler remained inactive and disconnected
f
rom power mains supply
f
or a long period o
f
time, pump unblocking procedure
m
ay
b
e necessary.
T
he above mentioned procedure involves boiler casin
g
removal in order to access the inside of the boiler and must therefore be
i
mplemented by quali

ed personnel.
P
ump blocka
g
e may be prevented by addin
g
to the water in the CH system, specic protective, lm-producin
g
products, suitable for
m
ulti-metal
C
H systems.

10
2. Technical Characteristics and Dimensions
2.1. Technical Characteristics
The boiler is equipped with an integrated gas atmospheric burner and the following versions are available:
- CTN 24 AF: open chamber, natural draught boiler with electronic ignition and instantaneous DHW supply;
- CTFS 24 AF: sealed chamber, forced draught boiler with electronic ignition and instantaneous DHW supply;
Both models are equipped with ionization ame detection device.
The boilers meet applicable requirements of laws enforced in the country of destination and shown in their data plate
Installation in a country other than specied might be source of hazard to people, animals and objects.
The principal technical characteristics of the boilers are listed below:
Construction Characteristics
- Bi-thermal, high performance, copper heat exchanger.
- CH pump with integrated air purging device.
- 6-litre expansion vessel.
- Safety pressure switch, preventing low water pressure operation.
- DHW priority ow switch.
- 10 liter/min DHW ow limiting device.
- Boiler loading and unloading taps.
- DHW and CH temperature probes.
- Safety limit thermostat.
- IPX4D electrically protected control panel.
- Integrated safety and modulation electronic board.
- Electronic ignition and ionization ame detection device.
- Air/ue gas pressure switch (CTFS).
- Flue gas thermostat (CTN).
- Twin shutter, modulating gas valve.
User Interface
- Central heating selector/adjusting knob (35°C/78°C range).
- Boiler shutdown reset/DHW adjusting knob ( 35°C/58°C range).
- System water pressure gauge.
- Light emitting indicators for:
• Power ON;
• CH supply;
• ame detection;
• burner shut-down;
• gas valve alarm;
• burner shut-down due to overheating;
• burner shut-down due to air/ue gas pressure switch intervention (CTFS);
• burner shut-down due to faulty chimney draught (CTN);
• insufcient water pressure in the system;
• malfunction of temperature probes.
Functional characteristics
- DHW priority function.
- Electronic ame modulation in CH mode, with timed rising ramp.
- Electronic ame modulation in DHW mode.
- Boiler anti-frost function (ON: 5°C, OFF: 30°C or after 15 minutes operation).
- Flame propagation function during ignition procedure (CTFS).
- Timer controlled ambient thermostat (240 seconds with CH ow temperature > 40°C).
- Post-circulation function of pump in CH and anti-frost modes (30 seconds).
- Post-circulation function of pump in DHW (6 seconds in winter mode, 1 second in summer mode).
- Post-ventilation function in DHW mode and only when boiler is set to summer (10 seconds – CTFS).
- Post ventilation safety function after boiler shutdown of malfunction of probes (1 minute – CTFS).
- Pump anti-blocking function (30 seconds of pump operation each 24 hours of boiler inactivity).

11
2.2 Dimensions
MC
GF
R
0
1
3
6
5
42 bar
1
3
5
42 bar
Model CTN
Pic. 3 – CTN model dimensions
bottom view
top view
GGas inlet (1/2”)
MCH flow (3/4”)
CDHW flow (1/2”)
FCold water inlet (1/2”)
RCH return (3/4”)
Dimensions for connection to base hydraulic kit (option) Dimensions for connection to “plus” hydraulic kit (option)

12
MC
GF
R
0
1
3
6
5
42 bar
1
3
5
42 bar
Model CTFS
Pic. 4 – CTFS model dimensions
top view bottom view
GGas inlet (1/2”)
MCH flow (3/4”)
CDHW flow (1/2”)
FCold water inlet (1/2”)
RCH return (3/4”)
Dimensions for connection to base hydraulic kit (option) Dimensions for connection to “plus” hydraulic kit (option)

13
2.3 Hydraulic layouts
Pic. 5 – Hydraulic layout CTN model
Pic. 6 – Hydraulic layout CTFS model
1. DHW temperature probe
2. Modulating gas valve
3. CH temperature probe
4. Burner nozzles
5. Burner
6. Ignition/ame sensing electrode
7. Safety thermostat
8. Bi-thermal heat exchanger
9. Flue gas hood
10. Flue gas thermostat
11. Expansion vessel
12. Air purging device
13. Pump
14. Water pressure switch
15. 3 bar safety valve
16. Loading tap
17. DHW ow limiting device – 10 liter per
minute
18. Domestic cold water ow switch
19. Domestic cold water inlet lter
M CH ow
C DHW ow
G Gas intake
F Water mains inlet
R CH return
1. DHW temperature probe
2. Modulating gas valve
3. CH temperature probe
4. Burner nozzles
5. Burner
6. Ignition/ame sensing electrode
7. Safety thermostat
8. Bi-thermal heat exchanger
9. Sealed combustion chamber
10. Flue gas discharge fan
11. Flue gas check
12. Air/ue gas safety pressure switch
13. Air/ue gas coaxial ducts
14. Air check
15. Air purging device
16. Domestic cold water inlet lter
17. Expansion vessel
18. Pump
19. Loading tap
20. Water pressure switch
21. 3 bar safety valve
22. DHW ow limiting device – 10 liter per
minute
23. Domestic cold water inlet ow switch
M CH ow
C DHW ow
G Gas intake
F Water mains inlet
R CH return

14
2.4 Operating Data
Below indicated burner pressures are to be checked after a three minute boiler operation.
CTN 24 AF
Function Max. heat
input
Max. heat
output
Min. heat
output
Gas mains inlet
pressure
Diameter of
nozzles Burner pressure
(kW) (kW) (kW) (mbar) (mm) (mbar)
min max
Methane Gas
G20 24.5 22.2 10.8 20 1.30 3.2 12.5
Butane Gas
G30 24.5 22.2 10.8 29 0.78 6.6 27.5
Propane Gas
G31 24.5 22.2 10.8 37 0.78 8.5 35.5
No. 2 chart – CTN model adjustment data
Hot water supply ∆T 45°C = 7,1 l/min
Hot water supply ∆T 40°C = 8,0 l/min
Hot water supply ∆T 35°C = 9,1 l/min
Hot water supply ∆T 30°C = 10,6 l/min*
Hot water supply ∆T 25°C = 12,7 l/min*
*mixed water to the tap
CTFS 24 AF
Function Max. heat
input
Max. heat
output
Min. heat
output
Gas mains inlet
pressure
Diameter of
nozzles Burner pressure
(kW) (kW) (kW) (mbar) (mm) (mbar)
min max
Methane Gas
G20 25,5 23,7 11,2 20 1,35 3,0 12,5
Butane Gas
G30 25,5 23,7 11,2 29 0,80 7,0 28,0
Propane Gas
G31 25,5 23,7 11,2 37 0,80 9,5 36,0
No. 3 chart – CTFS model adjustment data
Hot water supply ∆T 45°C = 7,5 l/min
Hot water supply ∆T 40°C = 8,5 l/min
Hot water supply ∆T 35°C = 9,7 l/min
Hot water supply ∆T 30°C = 11,3 l/min*
Hot water supply ∆T 25°C = 13,6 l/min*
*mixed water to the tap

15
2.5 General Characteristics
CTN 24 AF CTFS 24 AF
Equipment category - II2H3+ II2H3+
Number of burner nozzles installed n° 11 11
Minimum CH ow rate l/h 550 550
Minimum CH pressure bar 0.5 0.5
Maximum CH pressure bar 3 3
Minimum DHW pressure bar 0.5 0.5
Maximum CH pressure bar 8 8
DHW specic capacity (∆t 30 °C) l/min 10.6 11.3
Electric power Supply – Voltage / Frequency V - Hz 230-50 230-50
Power mains supply fuse A 2 2
Maximum power consumption W 80 140
Electric protection rating IP X4D X4D
Net weight Kg 24.9 27.5
Methane gas consumption (*) m3/h 2.59 2.70
Butane gas consumption kg/h 1.93 2.01
Propane gas consumption kg/h 1.90 1.98
Maximum CH working temperature °C 83 83
Maximum DHW working temperature °C 58 58
Total capacity of expansion vessel l 6 6
Maximum recommended CH system capacity (**) l 100 100
No. 4 chart – General characteristics
(*) Value related to 15°C – 1013 mbar condition
(**) Maximum water temperature of 83°C, vessel preloaded at 1 bar.
CTFS 24 AF Max. heat output Min. heat output 30% load
Casing heat loss % 1.2 0.4 -
Flue system heat loss with burner on % 5.8 11.7 -
Flue system mass capacity (methane gas) g/s 16.0 16.9 -
Flue temp.– air temp. °C 107 77 -
CO2(methane - propane - butane) % 6.3 / 7.2 / 7.0 2.7 / 3.3 / 3.2 -
Boiler efciency rating % 93.0 90.2 90.2
92/42/CEE rating
No. 6 chart – Combustion data CTFS 24 AF model
CTN 24 AF Max. heat output Min. heat output 30% load
Casing heat loss % 3.2 2.7 -
Flue system heat loss with burner on % 6.1 9.4 -
Flue system mass capacity (methane gas) g/s 16.7 16.5 -
Flue temp.– air temp. °C 85 66 -
CO2(methane - propane - butane) % 5.7 / 7.4 / 7.3 2.7 / 3.8 / 3.7 -
Boiler efciency rating % 90.6 90.0 90.0
92/42/CEE rating
No. 5 chart – Combustion data CTN 24 model

16
T
he boiler is desi
g
ned as II
2
H
3
+
cate
g
ory and is to be installed in compliance with laws and standards in force in the country of instal
-
l
at
i
on.
3
.
2
.
I
nsta
ll
at
i
on
I
nsta
ll
at
i
on an
d
ma
i
ntenance proce
d
ures are to
b
e
i
mp
l
emente
d
emp
l
oy
i
ng exc
l
us
i
ve
l
y accessor
i
es an
d
spare parts w
hi
c
h
a
re approved and supplied by the manufacturer.
C
orrect boiler operation is not guaranteed when using accessories and
sp
are
p
arts which are not manufacturer a
pp
roved and su
pp
lied.
3
.2.1. Packa
g
in
g
T
he boiler is shipped in a sturd
y
cardboard box.
R
emove boiler
f
rom cardboard box and check its integrity.
T
he packin
g
materials can be recycled: disposal of must be mana
g
ed via specic waste collection sites.
K
eep packa
g
in
g
out o
f
the reach o
f
children, as it may be source o
f
dan
g
er.
T
he manu
f
acturer shall not be held responsible
f
or damage to people, animals, or property due to
f
ailure in
f
ollowing the above men
-
t
i
o
n
ed
in
s
tr
uc
ti
o
n
s
.
P
ac
k
ag
i
ng
i
nc
l
u
d
es one p
l
ast
i
c
b
ag conta
i
n
i
ng:
a)
installation, use and maintenance manual;
b)
wall mounting template
(
pic. 7
)
;
d
) two screws and wall plu
g
s in order to afx the boiler to the wall;
e)
in
C
TF
S
model: one diaphragm for ue gas discharge
(
diameter
42
.
5
)
;
f
) in CTFS model: one sealin
g
caps with
g
asket.
3
.2.2.
C
hoosing where to install the boiler
T
he
f
ollowing must be taken into account when choosing where to install the boiler:
-
the indications
g
iven in … “Flue
g
as dischar
g
e system” para
g
raph;
-
check the wall to be adequately well-built avoiding to

t the boiler on
f
ragile walls;
-
after the installation, check that 1 cm to the ri
g
ht and 1 cm to the left of the boiler was left for casin
g
removal;
-
Do not t the boiler above any equipment that may prejudice proper operation
(
steam and grease vapor emitting kitchen appliances,
w
ashin
g
machines, etc.);
-
D
o not
i
nsta
ll
b
o
il
ers w
i
t
h
a natura
l
d
raug
h
t
i
n rooms w
i
t
h
a corros
i
ve or very
d
usty atmosp
h
ere, suc
h
as
h
a
i
r sa
l
ons,
l
aun
d
r
i
es, etc.,
a
s that may greatly reduce boiler li
f
espan.
3. INSTRUCTIONS FOR THE INSTALLER
3.1 INSTALLATION STANDARDS

17
pic. 7 - Template
3
.2.3. Positionin
g
the Boiler
E
ach unit is supplied alon
g
with a paper template, in
t
he packa
g
e, allowin
g
positionin
g
the pipes connec
-
t
ing
C
H system, DHW system, gas supply, and air
i
ntake/ue
g
as dischar
g
e ducts to the boiler before
i
nstallin
g
the boiler itself.
T
he template is made o
f
highly resistant paper and is
to
be
a
fx
ed
t
o
th
e
w
a
ll
o
n whi
c
h th
e
bo
il
e
r i
s
t
o
be
m
ounted usin
g
a carpenter’s level. It provides all the
i
ndication required in order to drill the holes
f
or

xing
t
he boiler to the wall
,
the boiler is secured to the wall
u
sin
g
two screws and wall plu
g
s.
T
he lower part o
f
the template shows the areas to be
m
arked for the couplin
g
s positionin
g
of boiler con
-
n
ection to the
g
as supply pipe, water mains supply
p
ipe, DHW ow pipe,
C
H ow and return pipes.
T
he u
pp
er
p
art of the tem
p
late shows the areas to
b
e marked for positionin
g
of air intake and ue
g
as
di
sc
h
arge
d
ucts.
S
ince the tem
p
erature of the walls on
whi
c
h
t
h
e
b
o
il
er
i
s mounte
d
an
d
t
h
e
t
em
p
erature of coaxial flue s
y
stem do
n
ot exceed 60°C
,
minimum distances
f
rom
fl
amma
bl
e wa
ll
s
d
o not nee
d
to
b
e
a
rran
g
ed.
F
o
r boilers with s
p
lit
p
i
p
e flue s
y
stem, in
p
resence o
f
fl
amma
bl
e wa
ll
s an
d
p
assa
g
es throu
g
h such walls, provide
i
nsulatin
g
layer between wall and
fl
ue p
i
pes.

18
3
.
2
.4.
I
nsta
lli
n
g
t
h
e
B
o
il
er
B
efore connectin
g
the boiler to the
C
H and DHW pipe systems, clean the pipes carefully and eliminate
a
ny metal left durin
g
manufacturin
g
and weldin
g
process, any oil or
g
rease that may be left and that could dama
g
e
t
he boiler or alter its o
p
eration i
f
it reaches the boiler.
Do not use solvents as they could dama
g
e components
.
E
xclusively employ original and manufacturer supplied, air intake/flue gas discharge systems in order to ensure correct
b
oiler o
p
eration
Th
e manu
f
acturer s
h
a
ll
not
b
e
h
e
ld
respons
ibl
e
i
n case o
f
d
ama
g
e to peop
l
e, an
i
ma
l
s, or property
d
ue to
f
a
il
ure
i
n following the above mentioned information.
I
n order to install the boiler,
p
roceed as
f
ollows:
-
a
fx the template to the wall;
-
c
heck that 1 cm to the right and 1 cm to the left of the boiler is left for casing removal;
-
p
rov
id
e two 1
2
mm Ø holes in the wall for the boiler wall plu
g
s, insert the wall plu
g
s provided with the boiler and place in the screws;
-
w
hen necessary provide holes in the wall to allow air intake and
/
or ue gas discharge pipes to pass through it;
-
P
osition the couplin
g
s for connection to the
g
as supply pipe
(G)
, the cold domestic water supply pipe
(
F
)
, the domestic cold water ow
p
ipe (C), and the central heating ow (M) and return pipes (R), as shown on the template (lower area);
-
H
oo
k
t
h
e
b
o
il
er to t
h
e prev
i
ous
ly
prov
id
e
d
screws;
-
C
onnect the boiler to the feed pipes;
-
C
onnect the boiler to the air intake and ue gas discharge system
(
refer to
3
.
2
.
5. and
3
.
2
.
6. paragraphs
)
;
-
C
onnect power suppl
y
and ambient thermostat (when available).
3
.
2
.
5
.
Boile
r r
oo
m v
e
nt
ila
t
io
n
C
TN boiler model has an open combustion chamber and is desi
g
ned
f
or connection to a chimney: combustion air
i
s drawn directly from the room where the boiler is installed.
C
T
F
S
bo
il
e
r m
ode
l h
as
a
sea
l
ed
co
m
bus
ti
o
n
c
h
a
m
be
r
a
n
d
does
n
o
t with
d
r
a
w
co
m
bus
ti
o
n
a
ir fr
o
m th
e
r
oo
m wh
e
r
e
th
e
bo
il
e
r i
s
i
nstalled, so speci

c recommendations do not need to be applied involving air intake ventilation openings, or concerning boiler room
r
equ
i
rements.
The Manufacturer shall not be held liable for damage resulting in incorrect installation, use, modification of the
e
qu
i
pment or non-o
b
servance o
f
i
nstruct
i
ons prov
id
e
d
b
y t
h
e manu
f
acturer or app
li
ca
bl
e
i
nsta
ll
at
i
on stan
d
ar
d
s
f
or
t
he
p
roduct.
3
.
2
.
6
.
Ai
r
i
nta
k
e an
d
fl
ue gas
di
sc
h
arge system
I
n terms of the ue dischar
g
e into the atmosphere, comply with applicable laws and prescriptions in the country
o
f installation.
T
he boiler is equipped with a safety device which is oversees flue gas exhaustion.
I
n case of malfunction of the air intake
/
flue
g
as dischar
g
e system, the device shuts down the equipment and no. 1
L
ED turns on
(y
ellow
)
.
I
t
i
s str
i
ct
l
y
f
or
bidd
en to tamper or
d
e-act
i
vate t
h
e sa
f
ety
d
ev
i
ce.
S
hould the boiler repeatedly shut down, it is necessary to have the boiler air intake/flue gas discharge ducts checked,
t
hey could be obstructed or incorrectly sized for flue
g
as exhaust into the atmosphere.
3
.
2
.
6
.1.
N
atura
l
d
raug
h
t
b
o
il
er
C
onnectin
g
to the chimney
T
he chimney is indispensable for correct boiler operation; it must therefore comply with the following requirements:
-
it must be made o
f
waterproo
f
material and be resistant to

ue
g
as temperature and related condensate;
-
i
t must
h
ave appropr
i
ate mec
h
an
i
ca
l
c
h
aracter
i
st
i
cs an
d
l
ow t
h
erma
l
con
d
uct
i
v
i
ty;
-
it must be per
f
ectly sealed;
-
it must be as vertical as possible and the roof terminal is to have a removable cap for inspection and cleanin
g
;
-
the chimney diameter is not to be less wide than the boiler ue gas outlet diameter; squared or rectangular section chimneys must
b
ear an internal section, 10
%
lar
g
er than the section connected to the boiler anti-wind
g
ust device;
-
starting from the boiler, the duct connecting to the chimney is to follow a vertical direction and must be long not less than twice its
d
iameter be
f
ore joinin
g
the chimney.

19
Direct emission into the atmosphere
Natural draught boilers can discharge ue gas directly into the atmosphere via a duct which goes through the outside walls of the buil-
ding and ends with an anti-wind gust device terminal.
The ue gas exhaust duct is to comply with the following requirements:
- its sub-horizontal part inside the building must be as short as possible (not longer than 1,000 mm);
- it is not to have more than 2 direction changes;
- it can host only one single boiler ue gas exhaust system;
- its section, which is passing through the wall is to be protected by a sheath duct; the part of the sheath duct facing the inside of the
building is to be sealed, while the part facing outwards is to be left open;
- its end section, on which the terminal is to installed, is to protrude from the wall of the building for a length of a
least twice the diameter of the duct;
- the terminal is to be positioned no less than 1.5 meters higher than the ue gas exhaust duct from the boiler (see pic. 8).
2 Ø min. 2 Ø min.
1,5 m min.
1,5 m min.
Ø
Ø
2 Ø
2 Ø
1 m max. 1 m max.
Pendenza
min. 3 % Pendenza
min. 3 %
> 3 Ø > 3 Ø
0
1
3
6
5
42 bar
1
3
5
42 bar
0
1
3
6
5
42 bar
1
3
5
42 bar
Pic. 8 – Connection to the chimney for CTN model
400
700
250
Ø 130,8
121
200 200
0
1
3
6
5
42 bar
1
3
5
42 bar
Pic. 9 – Dimensions for connection of CTN model to the chimney
Slope
Slope

20
3.2.6.2. Forced draught boiler
3.2.6.2.1 Configuration of air intake and flue gas discharge ducts
Type
C12
Type
C32
Type
C42
Type
C52
Type
C82
Type
B22
B22 This boiler is conceived for connection
to an existing ue system either internal or
external to the boiler room. Combustion air
is taken directly from the boiler room itself
while ue gas is conveyed to the outside.
The boiler is not to be tted with an anti-
wind gust device, while it is to be equipped
with a fan, mounted after the combustion
chamber.
C12 This boiler is designed to be con-
nected to horizontal outlet and intake ducts
connected to the outside by means of
coaxial or split ducts.
The distance between the air intake duct
and the ue gas outlet duct is to be a mini-
mum of 250 mm (refer to the picture on the
lateral area of the page) and both terminals
must be positioned within a squared area
having 500 mm sides.
C32 This boiler is designed to be con-
nected to vertical outlet and intake ducts
connected to the outside by means of coa-
xial or split ducts. The distance between
the air intake duct and the gas ue duct
is to be a minimum of 250 mm (refer to
the picture on the lateral area of the page)
and both ends must be positioned within a
squared area having 500 mm sides.
C42This boiler is designed to be con-
nected to a collective chimney pipe system
that includes two ducts, one for taking in
combustion-supporting air and the other
for removing the products of combustion.
These ducts may be coaxial or split.
The ue gas chimney system must comply
with current standards.
C52 Boiler with separate pipes for the
combustion supporting air intake and for
removal of the products of combustion.
These ues may discharge in areas at a
different pressure. The terminals may not
face each other from opposed walls.
C82 This boiler is designed to be
connected to combustion air terminal
and to a single ue gas terminal or to
collective chimney.
The ue gas chimney must comply with
current standards.