Ferroli ARENA 30 A User manual

ARENA 30 A
WALL-HUNG, PRE-MIX
GAS-FIRED CONDENSING BOILER
INSTALLATION
AND
OPERATING INSTRUCTIONS
Appr. nr. B99.15 A - CE 0063 BL 3475
cod. 3543694/1 ediz. 06/2002

ARENA 30 A
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 guidlines.
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.

ARENA 30 A
3
•Read the warnings given in this manual
thoroughly. They provide important in-
formation 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 appliance behind, always
ensure that the manual is kept with the
appliance for consultation by the new
owner and /or installer.
•Incorrect installation or poor mainte-
nance absolves the manufacturer from
all liability for damage to people or
things.
•Installation and maintenance must be
carried out i conformity with current
legislation, according to the manufac-
turer’s instructions and by qualified per-
sonnel.
•Before cleaning or maintenance, dis-
connect the appliance from the mains
via the switch on the appliance or a
suitable isolating device.
•In the event of malfunction or faulty
operation, deactivate the appliance. Do
not attempt to repair or carry out any
other operation on the appliance direct-
ly. Contact qualified personnel only.
•Repairs or the replacement of compo-
nents 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 pur-
poses other than those for which it was
explicitly designed. Any other use is
consideredimproperandthereforedan-
gerous.
•Incorrect installation and use or failure
to follow the instructions provided by
the manufacturer absolve the manufac-
turer from all liability for damage.
•After unpacking, check that the con-
tents are whole and undamaged.
•Keep packing out of reach of children as
it is potentially hazardous.
•To clean external parts, use a damp
cloth moistened with soapy water if nec-
essary. Avoid using abrasive cleaning
products and solvents.

ARENA 30 A
4
INDEX
1. CHARACTERISTICS AND TECHNICAL DATA ............................................................. 5
1.1 Introduction ..........................................................................................................5
1.2 Structural charateristics ........................................................................................6
1.3 Technical data table ..............................................................................................9
1.4 Diagrams .............................................................................................................10
1.5 Functional flow chart ..........................................................................................11
2. INSTALLATION ......................................................................................................... 12
2.1 General Instructions ...........................................................................................12
2.2 Positioning and wall mounting ...........................................................................12
2.3 Connection to the hydraulic system...................................................................13
2.4 Characteristics of the boiler water .....................................................................14
2.5 Connection to the gas system............................................................................14
2.6 DHW storage connection ...................................................................................15
2.7 Condensation discharge connection ..................................................................15
2.8 Electrical connections .........................................................................................16
2.9 Positioning the external probe...........................................................................17
2.10 Flues ..................................................................................................................18
2.11 Connection to concentric pipes .......................................................................18
2.12 Connection to separate pipes ..........................................................................20
2.13 Table of losses for piping and accessories .......................................................21
2.14 Terminal Position ..............................................................................................24
3. SERVICE AND MAINTENANCE ............................................................................... 25
3.1 Settings ...............................................................................................................25
3.2 Commissioning and testing ................................................................................28
3.3 Maintenance .......................................................................................................29
3.4 Replacement of parts .........................................................................................33
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 DHW storage exclusion ....................................................................................41
4.11 Outside temperature compensation ................................................................42
4.12 Maintenance .....................................................................................................42
4.13 Anomalies .........................................................................................................42

ARENA 30 A
5
1.1 Introduction
Dear Customer,
Thank you for having chosen the Arena 30 A, the latest generation FERROLI wall-hung boiler, featuring
advanced design and cutting-edge technology.
The Arena 30 A 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,with a radial shape andmetallicsurfaces, featuring electronic ignition with ionisationflamecontrol,
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 is preset for connection with external DHW storage. An internal circulator for DHW, connection
dedicated to DHW storage, DHW probe make the connection extremely simple.
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 (also with DHW storage), 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.
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 A
6
1.2 Structural charateristics
Dimensions and connections
Key
1Heating outlet
2DHW storage flow
3Gas inlet
4DHW storage return
5Heating return
6Drain cock
7Safety valve
8Flue gas outlet
9Air inlet
Fig. 1
205
220
60
110120
8
9
73109,56262109,544
139
368
760
460
1 2 3 4 5 6
7

ARENA 30 A
7
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
151 System drain cock
161 Condensing heat exchanger
179 Non-return valve
186 Return sensor
191 Flue gas temperature sensor
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
114
213
14
220 16 151
32
216
56
44
69
70
215
214
179
161
217
186
49
34
35
191

ARENA 30 A
8
Heating
outlet Gas inlet DHW storage
inlet
Heating
inlet
Air
inlet Flue gas outlet
1644
56
49
191
32
34
186
22
82
188
216
114 14
Condensation
discharge
221
DHW
storage
outlet
179
179
Key
14 Safety valve
16 Fan
22 Main burner assembly
32 Heating pump
34 Heating temperature sensor
44 Gas valve
49 Safety thermostat
56 Expansion vessel
82 Detection electrode
114 Water pressure switch
179 Non-return valve
186 Return sensor
188 Ignition electrode
191 Flue gas temperature sensor
216 Domestic hot water pump
221 Bypass cock
Hydraulic diagram
Fig. 3

ARENA 30 A
9
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
Dimensions, weights, conections
Height mm
Width mm
Depth mm
Empty weight kg
Gas system connections poll.
Heating system connections poll.
Domestic hot water storage connections poll.
Condensation discharge (flexible pipe) mm
Maximum length separate flues D=80* meq
(*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
760
460
368
55
1/2”
3/4”
3/4”
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
nm3/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 A
10
6,0
III
II
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 A
11
1.5 Functional flow chart
Fig. 6
13
1
2
151412111087654
1245678101112
NL
3
2
1
24 V AC
24 V AC
X2
X1
131415
X5
X6
175
X10
X11
PC
32
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
--
DMF04
NL
L
N
NL
114
12
1110987654321
X7
---
191
72
32
98
130
186
188 82
34
139
138
49
4
5
NL
230 V
50 Hz
230 V
50 Hz
83
101
42
230V 50Hz Low voltage
Eco/Comfort
selection
12
1
Legenda
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
130 D.H.W. pump
138 Outside temperature sensor
139 Room unit (not fitted)
175 Transformer
186 Return temperature sensor
188 Hot surface igniter
191 Exhaust temperature sensor

ARENA 30 A
12
> 50 cm
Minimum Recommended
A
B
D
3 cm
15 cm (20 cm from DHW storage)
1,5 cm
(from any openable panel)
15 cm
30 cm
C10 cm 15 cm
A A
B
D
C
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
Fig. 7a

ARENA 30 A
13
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
AA
B
C
106
16,5
139
2 3 4 51
6
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
mayallowtheinternalcomponentsoftheboilertobereached.
If the appliance is enclosed in a cabinet or alongside another
appliance, space must be allowed for normal maintenance
operations. Fig. 7 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 Ifthere is no drilling template for mounting
the appliance, simply fasten the boiler to
the wall using suitable support screws with
metal wall plugs, through the holes in the
boiler frame.
Key
1Heating outlet
2DHW storage flow
3Gas inlet
4DHW storage return
5Heating return
6Drain cock
Fig. 8
2.3 Connection to the hydraulic system
Make the connections to the corresponding couplings, according to the
positions indicated in Fig. 3.
Fig. 7b
Fig. 7c

ARENA 30 A
14
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
Inthepresence of water with hardness above 18 Clarke degrees,thewater should be suitably treated, to avoid
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.
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.

ARENA 30 A
15
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
pipeworkmustbe adequately supported. An isolating gas valveisprovidedand should be fitted on theboiler
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 DHW storage connection
Connect the DHW storage
directlyto the boiler, follow-
ing the positions indicated
in fig. 8. If the DHW storage
is collocated on the floor,
under the boiler, it is neces-
sary to leave the suggested
space for the extraction of
the burner unit between
DHW storage and boiler, as
showninthefig. 7a. Be care-
ful that connection pipes to
the DHW storage do not
interfere or limit the possi-
bility to extract the burner unit (also see sequence of figures 24a - 24h). It is suggested to leave at least 30 mm.
2.7 Condensation discharge connection
Theboiler must be connectedtothe condensation dischargesiphon,supplied as standard withthe appliance.
1) Take out the flexible grey
condensationdischargepipe
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) Connectthe corrugatedpipe
Cto the bottom connector
D;
5) Beforedefinitively connecting
the corrugated pipe Cto the
drainagesystem,fill thesiphon
with about 0,5 litres ofwater
CWS hot water draw off
AAW
Arena 30A
GAS
PIPE CONNECTIONS ON BOILER
1 - C/H flow
2 - DHW flow
3 - Gas supply
4 - DHW return
5 - C/H return
12 3 45
Fig. 8b
Attenzione:
Riempire il sifone con
acqua prima di
collegarlo
A
B
E
C
D
Attention:
Fill the siphon with
water before
connecting
Fig. 9

ARENA 30 A
16
Room thermostat, external unit and auxiliary controls
Below the electrical control box is a multipolar terminal block, for connecting:
•Room thermostat (1-2)
WARNING:THEROOM THERMOSTATMUST NOT
HAVE LIVE CONTACTS. CONNECTING 230V TO
THE ROOM THERMOSTAT TERMINALS WILL
CAUSE IRREVERSIBLE DAMAGE TO THE ELEC-
TRONIC BOARD.
When connecting a room thermostat with daily or
weekly program, or a timer, avoid taking the power
supply to these devices from their switch contacts.
Their power supply must derive from a direct con-
nection to the mains or using batteries, 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.
•Switch for economy/comfort remote selection (3-
4). With the switch turned off the boiler is main-
tained in “Comfort”, independently from the set-
ting on the menu or on the remote control.
•External temperature probe (7-8)
With the probe (optional) connected, the boiler
worksin outsidecompensation temperaturemode,
depending on the compensation curve settled (ref.
4.10). 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.
•Remotecontrol(9-10),for remotecontrol and regu-
lation of the boiler, with weekly chronothermostat
and climatic regulation functions.
•DHW storage probe (11-12), for the DHW storage
temperature regulation. The probe has to be posi-
tioned in the DHW storage sump.
To make these connections, unscrew the four screws
whichfastenthelower 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
EDB
A
123456789101112
F
Fig. 10 c
A Room thermostat
B Eco/Comfort selection switch
D External temperature sensor
E Remote control
F DHW storage sensor
2.8 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 A
17
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 read-
ing.
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.
12345678910 10 12
Arena 30A connection block
DEF
LHE
230/50 vac supply
fused @ 3amp.
XY
room t/stat
cyl t/stat
X - CH circuit -- MUST be volt free
Y - DHW circuit -- MUST be volt free
they must NOT be connected to any external power source
programmer
Fig. 10 d
H
1/2H
1/2H
H
N
N W
Suggested conection for storage:

ARENA 30 A
18
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
Arena 30 A
Reducers for concentric bends
90°concentric bend
45°concentric bend
1 m
0,5 m
Ø100/60 mm concentric
12 m
Vertical
11 m
Horizontal*
Ø125/80 mm concentric
21 m
Vertical
20 m
Horizontal*
Fig. 13
1KWMA55Y
1KWMA57W
1KWMA35W
Ø 100
Ø 60
Øi 100
Øi 60

ARENA 30 A
19
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

ARENA 30 A
20
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
3Checkthat thetotalloss calculatedis less thanor equalto100 equivalentmetres,that isthe 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