Ferroli ARENA 30 C User manual

ARENA 30 C
WALL-HUNG, PRE-MIX
GAS-FIRED CONDENSING BOILER
INSTALLATION
AND
OPERATING INSTRUCTIONS
Appr. nr. B99.14 A - CE 0063 BL 3475
cod. 3543643/1 ediz. 04/2002

ARENA 30 C
2
IMPORTANT
Your “benchmark” Installation, Commissioning and Service Record Log Book will be enclosed in
your customer information pack.
“This record must be completed and left with the end user”.
Ferroli is a member of the Benchmark initiative and fully supports the aims of the programme.
Benchmarkhasbeenintroducedtoimprovethestandardsofinstallationandcommissioningofcentral
heating systems in the UK and to encourage the regular servicing of all central heating systems to
ensure safety and efficiency.
Please see installation and servicing guidelines.
CE MARK
CE mark documents that the Ferroli gas appliances comply with the requirement contained in
European directives applicable to them.
In particular, the appliances comply with the following CEE directives and the technical specifications
provided from them:
• Gas appliances directive 90/396
• Efficiencies directive 92/42
• Low tension directive 73/23 (modified from the 93/68)
• Electromagnetic compatibility directive 89/396 (modified from the 93/68)
Year 2000 Compliance Declaration
We will guarantee that this products is altogether suitable for the data change in the Year 2000 (boiler
has no dependence from date change) and that no disruptions will occur which is caused by this
product.
• Read the warnings given in this manual thorough-
ly. They provide important information for safe
installation, use and maintenance
• Keep the manual carefully for future consultation.
• The instruction manual is an integral and essential
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 appli-
ance 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 ab-
solves the manufacturer from all liability for dam-
age to people or things.
• Installation and maintenance must be carried out
i conformity with current legislation, according 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 re-
pair 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 personnel
using original spare parts only. Failure to respect
the above my compromise the safety of the appli-
ance.
• 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 soapy water if necessary. Avoid using
abrasive cleaning products and solvents.

ARENA 30 C
3
INDEX
1. CHARACTERISTICS AND TECHNICAL DATA ................................................................ 4
1.1 Introduction ......................................................................................................................... 4
1.2 Structural charateristics ....................................................................................................... 5
1.3 Technical data table ............................................................................................................. 8
1.4 Diagrams .............................................................................................................................. 9
1.5 Functional flow chart ......................................................................................................... 10
2. INSTALLATION ............................................................................................................ 11
2.1 General Instructions .......................................................................................................... 11
2.2 Positioning and wall mounting .......................................................................................... 11
2.3 Connection to the hydraulic system.................................................................................. 12
2.4 Characteristics of the boiler water .................................................................................... 13
2.5 Connection to the gas system........................................................................................... 14
2.6 Condensation discharge connection ................................................................................. 14
2.7 Electrical connections ........................................................................................................ 15
2.8 Room thermostat, external unit and auxiliary controls..................................................... 15
2.9 Positioning the external probe.......................................................................................... 16
2.10 Flues................................................................................................................................. 17
2.11 Connection to concentric pipes ...................................................................................... 17
2.12 Connection to separate pipes ......................................................................................... 19
2.13 Table of losses for piping and accessories ...................................................................... 20
2.14 Terminal Position ............................................................................................................. 23
3. SERVICE AND MAINTENANCE .................................................................................. 24
3.1 Settings .............................................................................................................................. 24
3.2 Commissioning and testing ............................................................................................... 27
3.3 Maintenance ...................................................................................................................... 28
3.4 Replacement of parts ........................................................................................................32
3.5 Troubleshooting................................................................................................................. 36
4. OPERATING INSTRUCTIONS ...................................................................................... 39
4.1 Operation and controls ..................................................................................................... 39
4.2 Boiler control panel ........................................................................................................... 39
4.3 Ignition ............................................................................................................................... 40
4.4 Shut-down.......................................................................................................................... 40
4.5 Operating indications on the display ................................................................................ 40
4.6 Accessing the operating menu.......................................................................................... 40
4.7 Setting the heating system temperature .......................................................................... 41
4.8 Setting the domestic hot water temperature ................................................................... 41
4.9 Summer/Winter Selection ................................................................................................. 41
4.10 Aquafast device ............................................................................................................... 41
4.11 Outside temperature compensation ............................................................................... 42
4.12 Maintenance .................................................................................................................... 42
4.13 Anomalies ........................................................................................................................ 42

ARENA 30 C
4
1.1 Introduction
Dear Customer,
Thank you for having chosen the Arena 30 C, the latest generation FERROLI wall-hung boiler, featuring
advanced design and cutting-edge technology.
The Arena 30 C is a pre-mix condensing thermal generator for heating and the production of domestic hot
water, with very high thermal efficiency and very low emissions, fired by natural gas or LPG.
The boiler body is made up of a prismatic mono-block heat exchanger, with a hexagonal base made from
aluminium alloy, inserted in a cylindrical steel jacket, with water cavity, and insulated externally with high-
density foam. The special design of the heat exchanger allows effective condensation of the water vapour
contained in the flue gases, making the Arena highly efficient. The heat exchanger has been designed to
maintain its characteristics of high thermal exchange over time.
Inside the aluminium mono-block heat exchanger, in a cooled combustion chamber, lies the pre-mix burner
assembly,witharadialshapeand metallic surfaces, featuring electronic ignition withionisationflamecontrol,
which allows extremely low emission values, and at the same time guarantees high reliability and constant
operation over time.
The combustion circuit and the air intake are sealed from the installation environment.
The boiler is fitted with a variable speed fan and built-in modulating gas valve, connected directly to the
outside.
The boiler control and regulation system is microprocessor-based, with advanced self-diagnostics. The user
interface, made up of a keypad and display, is user-friendly, and shows the operating status of the appliance
at all times. The operating parameters and the data logs are saved internally and can be called up using the
Personal Computer interface to simplify Service operations.
The heat output is regulated continuously across the entire operating range, with temperature-scrolling
climate control, which automatically adapts the operating mode to the characteristics of the internal and
external environments, of the building and its location.
Aspecialinternaldeviceallowsultra-fastproductionofdomestichotwater:hotwaterisavailableattheboiler
outlet as soon as the hot water tap is opened.
Completing the fitted devices are a variable-speed heating pump and a fixed-speed domestic hot water
pump, a high-capacity expansion vessel, flowmeter, safety valve, drain cock, water pressure switch, flue gas
sensor, temperature sensors and safety thermostat.
1. CHARACTERISTICS AND TECHNICAL DATA

ARENA 30 C
5
60
220
205
110120
460
760
368
739576,576,59544
108
50
68
12345
6
8
9
7
1.2 Structural charateristics
Dimensions and connections
Key
1Heating outlet
2Domestic hot water outlet
3Gas inlet
4Domestic hot water inlet
5Heating return
6Drain cock
7Safety valve
8Flue gas outlet
9Air inlet
Fig. 1

ARENA 30 C
6
114
213
14
220 16 136 151 194
32
216
56
44
69
70
215
214
179
161
217
191 186
49
34
35
Overall view and main components
Key
14 Safety valve
16 Fan
32 Heating pump
34 Heating temperature sensor
35 Auto air vent.
44 Gas valve
49 Safety thermostat
56 Expansion vessel
69 Flue gas outlet pipe
70 Air intake pipe
114 Water pressure switch
136 Flow-meter
151 System drain cock
161 Condensing heat exchanger
179 Non-return valve
186 Return sensor
191 Flue gas temperature sensor
194 Domestic hot water heat exchanger
213 Flexible inlet air pipe coupling
214 Flue gas outlet reducer
215 Air inlet reducer
216 Domestic hot water pump
217 Boiler body lagging
220 Ignition board
Fig. 2

ARENA 30 C
7
Heating
outlet Domestic hot water
outlet
Gas
inlet Domestic hot water
inlet
Heating
inlet
Air
inlet Flue gas outlet
1644
56
49
191
136
32
34
186
22
82
188
216
114 14
Condensation
discharge
42
221
179
194
179
Key
14 Safety valve
16 Fan
22 Main burner assembly
32 Heating pump
34 Heating temperature sensor
42 Domestic hot water temperature sensor
44 Gas valve
49 Safety thermostat
56 Expansion vessel
82 Detection electrode
114 Water pressure switch
136 Flow-meter
179 Non-return valve
186 Return sensor
188 Ignition electrode
191 Flue gas temperature sensor
194 Domestic hot water heat exchanger
216 Domestic hot water pump
221 Bypass cock
Hydraulic diagram
Fig. 3

ARENA 30 C
8
Heating
Maximum operating temperature, heating °C
Maximum operating pressure, heating bar
Minimum operating pressure, heating bar
Expansion vessel capacity litri
Expansion vessel pre-fill pressure bar
Boiler total water content litri
Domestic hot water
Domestic hot water supply ∆t 25°C l/min
Domestic hot water supply ∆t 30°C l/min
Domestic hot water supply ∆t 35°C l/min
Range of temperature regulation, domestic hot water °C
Maximum operating pressure, domestic hot water bar
Minimum operating pressure, domestic hot water bar
Dimensions, weights, conections
Height mm
Width mm
Depth mm
Empty weight kg
Gas system connections poll.
Heating system connections poll.
Domestic hot water circuit connections poll.
Condensation discharge (flexible pipe) mm
Maximum length separate flues D=80* m
eq
(*Values expressed in equivalent air metres - refer to FERROLI calculation system)
Electrical power supply
Max Electrical Power Consumption W
Pump electrical power consumption (Speed I-II-III) W
Power supply voltage/frequency V/Hz
85
3
0,8
12
1
11,8
17,5
14,6
12,5
40 - 65
6
0,25
760
460
368
55
1/2”
3/4”
1/2”
15x20
100
150
48-67-93
230/50
Power
Heat rate Hi
Heat rate Hs
Natural Gas rate (G20)
Natural gas supply pressure (G20)
LPG Gas rate (G31)
LPG Gas supply pressure (G31)
Pmax Pmin
kW 31,5 8,2
kcal/h 27.090 7.052
nm
3
/h 3,27 0,80
mbar 20 20
kg/h 2,44 0,60
mbar 37 37
Useful heat output 80°C - 60°C
Useful heat output 50°C - 30°C
Combustion
CO2 (Natural Gas - G20) %
CO2 (LPG - G31) %
Flue gas temperature 80°C-60°C°C
Flue gas temperature 50°C-30°C°C
Flue gas flow rate kg/h
Quantity of condensation kg/h
pH of condensation water pH
Pmax
9,5
10,2
70
40
49
3,3
Pmin
9,0
9,5
65
32
13
1,4
4,1
kW 30,9 7,6
kcal/h 26.574 6.536
kW 34,3 8,4
kcal/h 29.498 7.224
kW 30,0 7,4
kcal/h 25.800 6.364
1.3 Technical data table

ARENA 30 C
9
6,0
III
I
I
0,0
1,0
2,0
3,0
4,0
5,0
0 0,5 1 1,5 2 2,5 3
Q (m3/h)
3,5 4
H (m C.A.)
1.4 Diagrams
Heating pump head
Loss of boiler pressure
Fig. 4
Fig. 5
6,0
41,5 2 2,5 3 3,5
Q (m3/h)
1,0
2,0
3,0
4,0
5,0
1
0,0
0 0,5
H (m C.A.)

ARENA 30 C
10
13
12
151412111087654
1245678101112
NL
321
24 V AC
24 V AC
X2
X1
131415
X5
X6
175
X10
X11
PC
3 2
X3
X4
1 2 3 6 7 8 9 10 11 12
S4575B 1033
12 11 10
8 7 5 4 2 1
9 6
16
-
-
+
Output
-
-
DMF04
NL
L N
NL
42 114
121110987654321
X7
----
191
72
32
98
216
186
188 82
34 136
139 138
49
4 5
NL
230 V
50 Hz
230 V
50 Hz
83
101
230V 50Hz Low voltage
Eco/Comfort selection
12
1
DHW disable switch
Key
16 Fan 32 Central heating pump 34 C.H. flow temperature sensor 42 D.H.W. temperature sensor 49 Overheat cut-off thermostat 72 Room thermostat (not fitted) 82 Ionisation electrode 83 Full sequence automatic control 98 Switch
101 Main P.C.B.
114 Water pressure switch 136 Flowmeter 138 Outside temperature sensor 139 Room unit (not fitted) 175 Transformer 186 Return temperature sensor 188 Hot surface igniter 191 Exhaust temperature sensor 216 Domestic hot water pump
1.5 Functional flow chart
Fig. 6

ARENA 30 C
11
2. INSTALLATION
2.1 General Instructions
Gas Safety (Installation & Use) Regulations: 1996
In the interest of safety, it is the law that all gas appliances are installed by a competent person in accordance
with the above Regulations, Building Regulations/Building Standards Scotland, Codes of Practice, current
I.E.E. Regulations and the byelaws of the
Local Water Undertaking. Failure to comply
with the Regulations may lead to prosecution;
it is your responsibility to ensure that the law
is complied with.
N.B. For Northern Ireland the rules in force
apply.
IMPORTANT If the boiler is to be fitted in
a timber framed building it
should be fitted in
accordance with the
Institute of Gas Engineers
document IGE/UP/7. If in
doubt advice should be
sought from the Local
Supplier.
WARNING!! This appliance must be installed
in a room with sufficient ventilation, to avoid
dangerous conditions arising in the event of,
even minor, gas leaks. These safety standards
are imposed by the EEC Directive no. 09/396
for all gas appliances, including the so-called
sealed appliances.
2.2 Positioning and wall
mounting
The installation of the ARENA must be on a
suitable non-combustible load bearing wall
which will provide an adequate fixing for the
boiler mounting bracket assembly. The loca-
tion should be in an area where the water
pipes will not be subjected to frost conditions.
In siting the combination boiler the following
limitations must be observed:
The combination boiler may be installed in any
room or internal space, although particular attention is drawn to the requirements of the current I.E.E. wiring
regulations and in Scotland the electrical provisions of the building regulations applicable in Scotland, with
respect to the installation of the combination boiler in a room or internal space containing a bath or shower.
Where a room sealed appliance is installed in a room containing a bath or shower any electrical switch or
appliance control utilising mains electricity must be situated so that it cannot be touched by a person using
the bath or shower.
The boiler is supplied ready for wall-hung installation. The rear frame of the appliance has a series of slots
> 50 cm
Minimum Recommended
A
B
D
3 cm
15 cm
1,5 cm
(from any openable panel)
15 cm
30 cm
C10 cm 15 cm
A A
B
D
C
Fig. 7a

ARENA 30 C
12
108
68
12345
6
Key
1Heating outlet
2Domestic hot water outlet
3Gas inlet
4Domestic hot water inlet
5Heating return
6Drain cock
Fig. 8
for fastening it to the wall, using screws with metal wall plugs.
The fastening to the wall must provide stable and effective
support of the appliance.
The boiler must be fastened to a closed part of wall, which is
free of apertures or holes behind the frame of the boiler that
mayallowthe internalcomponentsoftheboilertobe reached.
If the appliance is enclosed in a cabinet or alongside another
appliance, space must be allowed for normal maintenance
operations. Fig. 7a shows the minimum and recommended
space to be left free around the appliance.
The boiler is supplied with a paper drilling template used to
trace the holes for fastening the appliance onto the wall.
Furthermore, upon request a metal version of the wall drilling
template is available, which can be reused for more than one
appliance.
Position the drilling template on the part of the wall chosen
for the installation of the boiler; using a spirit level, check that
the lower bracket is perfectly horizontal. Temporarily fasten
the drilling template to the wall using some adesive tape.
Trace the fastening points “A”. Drill two 10 mm holes 90 mm
deep to accept the wall plugs, fit wall plugs. Fit two special
wall plugs on the wall as described in the fig. 7c. Fasten the
wall bracket to the wall using an antitheft nut on the right side
and a standard nut (M8) on the left side. Mount the boiler on
the wall bracket and fix using an antitheft nut on the left side
and a standard nut (M8) on the right side.. The connection for
the water and gas pipes to the boiler are then
defined, from “B” lines (for vertical connections) or
from ”C” holes for horizontal connections (using
optional Ferroli kit).
Note Ifthereisno drilling templateformounting
the appliance, simply fasten the boiler to
the wall using suitable support screws with
metal wall plugs, through the holes in the
boiler frame.
2.3 Connection to the hydraulic system
Make the connections to the corresponding couplings, according to the positions indicated in Fig. 3.
Arena
30 A
748
460
44 109,5 62 62 109,5 73
16 16
11
16
205
220
60
110120
8
9
7511061,561,511045
139
368
760
460
1 2 3 4 5 6
115
Ø 3/4” Ø 1/2” Ø 3/4”
Kit Ferroli
cod. 1KWMA78Y
A
A
B
C
Fig. 7b
Fig. 7c

ARENA 30 C
13
In addition, shut-off valves should be installed between the boiler and the heating system to allow, if
necessary, the boiler to be isolated from the system. If a non-return valve is also installed in the domestic hot
water circuit, a safety valve must be fitted between the boiler and this circuit.
The discharge of the safety valve must be connected to a funnel or collection pipe, to avoid water leaking
onto the ground in the event of excessive pressure in the heating circuit.
Make the connections to the boiler so as its internal pipes are not subject to stress. For proper operation and
long-life of the boiler, the hydraulic system must be correctly proportioned and always complete with all the
accessories required to guarantee regular operation and conduction.
Upon request a connection kit can be supplied, simplifying connection to the system.
2.4 Characteristics of the boiler water
Inthepresenceofwaterwithhardnessabove18Clarke degrees, the water should be suitably treated,toavoid
any deposits in the boiler caused by hard water, or corrosion caused by aggressive water. It should also be
remembered that even minor deposits measuring just a few millimetres thick can cause, due to their low
thermal conductivity, significant overheating of the walls of the boiler, with consequent and serious problems.
The water must always be treated in the case of very large systems (with high water capacity) or systems with
the frequent inlet of recovered water. If, in these cases, the system needs to be partially or completely
emptied, it must be refilled with treated water.
Water System
Note The boiler is designed for sealed systems only and must NOT be used on open vented systems.
Central Heating
Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipework not forming
part of the useful heating surface should be insulated to prevent any heat losses or possible freezing (i.e. in
roof spaces or ventilated underfloor spaces). Drain taps should be positioned at the lowest point of the
system in accessible locations to permit the whole system to be drained down. The drain taps should be in
accordance with BS2879. Copper tubing to BS2871, Part 1 is recommended for water carrying pipework.
Pipework in horizontal runs should have a gradient where possible to facilitate the removal of air. Ensure that
the boiler heat exchanger is not a natural point for air collection.
Make Up Water
Provision must be made for replacing water lost from the sealed system. Reference should be made to
BS6798, for methods of filling and making up sealed systems. There must be no direct connection between
the boiler's central heating system and the mains water supply. The use of mains water to charge and
pressurise the system directly, is conditional upon the Local Water Byelaws. Again any such connection must
be disconnected after use.
Domestic Hot Water
Always fit a scale reducer in "hard water areas" (18 clarke degrees or over)". A 15mm copper connection
point on the boiler for attaching to the main supply is provided. The maximum domestic water pressure for
the inlet supply is 10 bar (145 P.S.I.). If the cold mains supply exceeds 5 bar (72 P.S.I.), a water governor
or pressure reducing valve must be fitted by the installer into the mains supply in an inconspicuous but
accessible position preferable between 3 and 5 metres (10-16ft) before the appliance. Such a valve must be
approved by the Water Research Council.
Attention - is drawn to the Model Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and certain
water undertakings will not accept their use above ground.
Ensure all pipework is adequately supported.

ARENA 30 C
14
2.5 Connection to the gas system
If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to establish
the availability of an adequate supply of gas.
An existing service pipe must not be used without prior consultation with the Local Gas supplier.
A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers Contractor.
Installation pipes should be fitted in accordance with BS6891-1988.
Appliance inlet working pressure must be 20mbar MINIMUM, for NG and 37 mbar minimum for LPG.
Pipework from the meter to the combination boiler must be of an adequate size.
The boiler requires 2.73m3/h of natural gas, and 2,00 kg/h of LPG.
Do not use pipes of a smaller size than the combination boiler inlet gas connection.
The complete installation must be tested for gas soundness and purged as described in BS6981-1988. All
pipeworkmustbeadequatelysupported. Anisolatinggasvalveisprovided and should be fitted on the boiler
gas inlet. Please wait 10 minutes when lighting from cold before checking gas rate. Gas pressures should be
checked after the boiler has operated for 10 minutes to reach thermal equilibrium.
2.6 Condensation discharge connection
Theboilermustbeconnected to the condensationdischargesiphon,suppliedas standard with theappliance.
1) Take out the flexible grey condensation discharge pipe A, already mounted in the boiler, from the proper
slot on the bottom;
2) Place the siphon on the wall, fix it to the wall with a screw + plug through the fixing point B;
3) Connect the grey pipe Ato the hose connector Eon the top of siphon, cutting it to the right length if
necessary;
4) Connect the corrugated pipe Cto the bottom connector D;
5) Before definitively connecting the corrugated pipe Cto the drainage system, fill the siphon with about 0,5
litres of water
Attenzione:
Riempire il sifone con
acqua prima di
collegarlo
A
Fig. 9
B
E
C
D
Attention:
Fill the siphon with
water before con-
necting

ARENA 30 C
15
EDCBA
123456789101112
2.8 Room thermostat, external
unit and auxiliary controls
Below the electrical control box is a multipolar
terminal block, for connecting:
• Room thermostat (1-2)
WARNING: THE ROOM THERMOSTAT MUST
NOT HAVE LIVE CONTACTS. CONNECTING
230V TO THE ROOM THERMOSTAT TERMI-
NALS WILL CAUSE IRREVERSIBLE DAMAGE
TO THE ELECTRONIC BOARD.
When connecting a room thermostat with daily
or weekly program, or a timer, avoid taking the
powersupplytothese devicesfromtheirswitch
contacts. Their power supply must derive from
a direct connection to the mains or using bat-
teries, depending on the type of device.
This appliance can also operate without a room
thermostat, yet the latter is recommended for
increased comfort and greater energy savings.
•Switchforeconomy/comfortremote selection(3-
4). With the switch turned off the boiler is main-
tained in “Comfort”, independently from the
setting on the menu or on the remote control.
•DHW exclusion switch (5-6) for remotely dis-
able the DHW function. Open contact will ex-
clude DHW.
•External temperature probe (7-8)
With the probe (optional) connected, the boiler
works in outside compensation temperature
mode, depending on the compensation curve
settled (ref. 4.11). If none probe is connected,
the boiler works in standard mode and setting
of a compensation curve (parameter 9 of menu)
is ignored by the control system.
•Remote control (9-10), for remote control and regu-
lation of the boiler, with weekly chronothermostat
and climatic regulation functions.
To make these connections, unscrew the four
screws which fasten the lower protective plate
and connect the wires to the terminal block,
respecting the position of the terminals (refer to
the wiring diagrams, chap. 1.5)
Fig. 10 a
Fig. 10 b
Fig. 10 c
A Room thermostat
B Eco/Comfort selection switch
C Domestic hot water exclusion switch
D External temperature sensor
E Remote control
2.7 Electrical connections
Power supply
The boiler must be connected to a single-phase, 230 Volt-50 Hz power line, with max 3A fuses fitted between
boiler and the line, as well as a bipolar switch ON/OFF with contacts whose opening is at least 3 mm. The
boiler must always be properly earthed.
When electrically connecting the boiler to an electrical system with live and neutral, THE POLARITY MUST BE
RESPECTED (LIVE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green). Note: If replacing the electrical
power cable, use only the “HAR H05 VV-F” cable, 3x0.75 mm2, with a maximum external diameter of 8 mm.

ARENA 30 C
16
Fig. 12
Fig. 11
2.9 Positioning the external probe
The external probe is best installed on a wall facing north, north-west or which borders the majority of the
main living area. The probe must never be exposed to the early morning sun, and, in general and where
possible, must not receive direct sunlight; if necessary, it should be shielded.
The probe must not in any case be fitted near windows, doors, ventilation openings, flues, or sources of heat
which may alter the reading.
Note: The maximum length allowed for the electrical cable connecting the boiler to the external probe is
50 m. A common two-lead cable can also be used.
H
1/2H
1/2H
H
N
N W

ARENA 30 C
17
2.10 Flues
Arena is a type-C boiler with forced draught, the air inlet and the flue gas outlet must be connected to one
of the exhaust–intake systems indicated as follows. Using the tables and the methods of calculation
described, first verify, before installation, that the flues do not exceed the maximum allowed length.
2.11 Connection to concentric pipes
An aluminium “60/100 concentric adapter” is available for connecting the boiler to 60/100 mm concentric
pipes. The extreme ease of mounting and the use of double-lip gaskets in the couplings makes this solution
extremely advantageous and safe. Furthermore, an aluminium and plastic concentric kit is available for
discharge using 80/125 concentric pipes.
The total length in linear metres of the concentric pipes must not exceed the maximum length indicated in
the first table below. The second table shows the reductions to be used for any bends in the pipes, excluding
the initial one.
For installation, connect the concentric kit directly to two diameter 80
bell-shaped reducers in the boilers, as indicated in Fig. 13. The
concentric kit can then be connected directly to a concentric bend
using a horizontal pipe or a concentric pipe in the vertical position.
Maximum allowable pipe length
Ø100/60 mm concentric
Arena 30 C 12 m
Vertical
11 m
Horizontal*
Reducers for concentric bends
90°concentric bend
45°concentric bend
1 m
0,5 m
Ø125/80 mm concentric
21 m
Vertical
20 m
Horizontal*
Fig. 13
1KWMA55Y
1KWMA57W
1KWMA35W
Ø 100
Ø 60
Øi 100
Øi 60

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To locate the centre of the hole for the passage of the pipes in the wall, refer to Fig. 14:
Please consider that the horizontal concentric piping must have a slope towards the boiler of at least 3 mm/
m, to allow the condensation which forms in the flues to flow back to the boiler, and avoid external dripping.
The concentric pipes should be sealed with the relative pipe coupling seal at the points of coupling to the
wall. The external piping must protrude from the wall between 10 and 60 mm (Fig.15).
Fig. 14
Fig. 15
3°
60
110
142

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Upon request, a wide range of pipes, bends and accessories can be supplied. For the various components,
refer to tables 1 – 2 – 3 or to the flue accessory catalogue.
A simple calculation can be performed to ensure that the maximum allowable pipe length is not exceeded:
1For each component, table 1 – 2 – 3 lists the loss of pressure in “equivalent air-metres”, depending
on the position of installation of the component itself (air intake or flue gas exhaust, vertical or
horizontal).
The loss is called “equivalent air-metres” as it relates to the loss of a metre of air intake pipe (defined
as being equal to 1). For example, a 90°Ø80 bend in flue gas exhaust has a loss equivalent to 2.5
air-metres, that is equal to 2.5 linear metres of air intake pipe.
2Once having completely defined the layout of the double flue system, add the losses in equivalent-
metres, according to the position of installation of all the components and accessories in the system
3Checkthatthetotal losscalculatedisless than orequalto100 equivalentmetres,thatisthe maximum
allowable for this model of boiler.
If the flue system chosen exceeds maximum allowable limit, some sections of the pipes should be
larger in diameter.
2.12 Connection to separate pipes
The separate Ø60 pipes for air intake and flue gas exhaust can be connected directly to the boiler, as shown
in Fig. 16a. Separate Ø80 pipes can be connected directly, once the two 80/60 (optional) reducers have been
fitted inside the boiler (Fig. 16b).
Ø60 Ø60
Flue Air
Ø80 Ø80
Ø80 Ø80
Flue Air
Fig. 16 a Fig. 16 b Fig. 16 c

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2.13 Table of losses for piping and accessories
KWMA83U
KWMA86A
KWMA85A
KWMA86U
KWMA84U
Air Flue
Vertical Horizontal Vertical Horizontal
KWMA01K
KWMA02K
KWMA05K
KWMA82A
KWMA38A • 0,50 m
KWMA83A • 1,00 m
KWMA06K • 2,00 m
KWMA07K • 4,00 m
Description
Tubo Ø 80
male-female
Female-female
bend 45°Ø 80 mm
Female-female
bend 90°Ø 80 mm
Male-female
bend 90°Ø 80 mm
Pipe fitting M/M/F Ø80
with inspecting
plug+trap for
condensate drainage
system
Description
Airwall terminal
products of
combustion Ø80 mm
Air terminal of inlet
protection Ø80 mm
Outlet flue air inlet
for concentric system
Ø80
Pipe fitting for
outlet flue Ø80 mm
Outlet flue air inlet
for connection with
split end Ø80 mm
0,5
1
2
4
0,5
1
2
4
0,8
1,6
3,2
6,4
1
2
4
8
1,2 1,8
2,0 2,5
1,5 2,0
7
Reduction
KWMA55U
5
2
4
3
Air Flue
Vertical Horizontal Vertical Horizontal
Reduction
12
Condensate flue
outlet
KWMA03U
Spigot and socket
reduction Ø 80/100 mm
0
Accessories Ø 80 Accessories Ø 80
Tab. 2
The loss values listed refer to original FERROLI
pipes and accessories
Tab. 1