Ferroli T-ONE Troubleshooting guide

'
cod. 3541D730 — Rev. 00 - 05/2013
T-ONE
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
“T-ONE 25 C HE” GC N° 47-267-59
“T-ONE 30 C HE” GC N° 47-267-60

T-ONE C HE
2EN
cod. 3541D730 - Rev. 00 - 05/2013
B• Carefully read the warnings in this instruction book-
let since they provide important information on safe
installation, use and maintenance.
• This instruction booklet is an integral part of the
product and must be carefully kept by the user for fu-
ture reference.
• If the unit is sold or transferred to another owner or if
it is to be moved, always make sure that the booklet
accompanies the boiler so that it can be consulted
by the new owner and/or installer.
• Installation and maintenance must be carried out by
professionally qualified personnel, according to cur-
rent regulations and the manufacturer's instructions.
• Incorrect installation or poor maintenance can cause
damage or physical injury. The manufacturer de-
clines any responsibility for damage caused by er-
rors in installation and use or by failure to follow the
manufacturer's instructions.
• Before carrying out any cleaning or maintenance oper-
ation, DISCONNECT AND ISOLATE the boiler from the
electrical power supply.
• In case the unit breaks down and/or functions poorly,
deactivate it, do not make any attempt to repair it or
directly intervene. Contact professionally qualified
personnel. Any repair/replacement of products must
only be carried out by qualified professional person-
nel using exclusively genuine parts. Failure to com-
ply with the above could affect the safety of the unit.
• Periodical maintenance carried out by qualified per-
sonnel is essential for guaranteeing good operation
of the unit.
• This unit must only be used for the purpose for which
it was designed. Any other use is considered im-
proper and therefore hazardous.
• After removing the packing, check the integrity of the
contents. Packing materials must not be left within the
reach of children as they are potentially hazardous.
•
•
In case of doubt do not use the unit, and contact the
supplier.
• The images shown in this manual are a simplified
representation of the product. In this representation
there may be slight, unimportant differences with the
supplied product.
• Whilst every effort is taken to ensure the accuracy of
the information contained within these instructions,
the details are offered in good faith and the Manufac-
turer accepts no liability for matters arising as a re-
sult of errors and/or omissions.
•
•
Due to the Manufacturers continuous product re-
search and development, the details contained in
this manual may not truly reflect the actual product.
IMPORTANT
•Your "benchmark" Installation, Commissioning and Service Record Log Book is enclosed in the
last pages of this manual. “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.
Benchmark has been introduced to improve the standards of installation and commissioning of
central 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.
•"Ferroli declare that no substances harmful to health are contained in the appliance or used
during the appliance manufacture”.
BThis symbol indicates "Caution" and is placed next to all safety warnings. Strictly follow
these instructions in order to avoid danger and damage to persons, animals and things.
AThis symbols calls attention to a note or important notice.
2009/142
2006/95
2004/108
The unit must not be used by people (including
children) with limited physical, sensory o mental
abilities or without experience and knowledge of it,
unless instructed or supervised in its use by some-
one responsible for their safety.
The unit and its accessories must be disposed of
appropriately, in conformity with the current regula-
tions

T-ONE C HE
3
' cod. 3541D730 - Rev. 00 - 05/2013
1 Instructions .............................................................................................................................. 4
1.1 Introduction............................................................................................................................................. 4
1.2 Control panel .......................................................................................................................................... 4
1.3 Turning ON and OFF..............................................................................................................................5
1.4 Adjustments............................................................................................................................................ 7
2 Installation ................................................................................................................................ 9
2.1 General Instructions ...............................................................................................................................9
2.2 Place of installation .............................................................................................................................10
2.3 Plumbing connections .......................................................................................................................... 10
2.4 Connection to the gas system .............................................................................................................. 12
2.5 Electrical connections........................................................................................................................... 12
2.6 Flue system .......................................................................................................................................... 14
2.7 Condensate drain connection...............................................................................................................18
3 Service and maintenance...................................................................................................... 20
3.1 Adjustments..........................................................................................................................................20
3.2 Start-up................................................................................................................................................. 21
3.3 Commisioning instructions ...................................................................................................................22
3.4 Routine servicing, maintenance & repair..............................................................................................23
3.5 Troubleshooting.................................................................................................................................... 26
4 Technical data and characteristics ...................................................................................... 27
4.1 Dimensions and connections ...............................................................................................................27
4.2 General view and main components ....................................................................................................28
4.3 Water circuit .........................................................................................................................................29
4.4 Technical data table .............................................................................................................................30
4.5 Diagrams ..............................................................................................................................................31
4.6 Wiring diagram ..................................................................................................................................... 32

T-ONE C HE
4EN
cod. 3541D730 - Rev. 00 - 05/2013
1. Instructions
1.1 Introduction
Thank you for choosing the T-ONE C HE, a FERROLI wall-mounted boiler the latest generation appliance, featuring
advanced design and cutting-edge technology.
T-ONE C HE is a high-efficiency condensing pre-mix appliance for central heating and hot water production, running
on natural gas or LPG, generating extremely low emissions.
The boiler is constructed with a stainless steel heat exchanger providing effective condensation of the water vapour con-
tained in the flue gases, permitting extremely high efficiency.
Inside the boiler there is a premix burner with an integral fan, with a large stainless steel surface.
The boiler is totally room sealed from the installation room: the air needed for combustion is drawn from outside. The
boiler also includes a modulating speed fan, modulating gas valve, pump, expansion vessel, safety valve, flow sensor,
safety and control double temperature sensors, a safety thermostat and a low water pressure switch.
Thanks to the microprocessor control and adjustment system with advanced self-diagnosis, unit operation is for the
most part automatic. The power for heating is automatically governed by the control system.
The display continuously provides information on the unit’s operating status and it is easily possible to obtain additional
information on the sensor temperatures, set-points, etc. or configure them. Any operating problems associated with the
boiler or system is immediately signalled by the display and, if possible, corrected automatically.
1.2 Control panel
fig. 1 - Control panel
Key
1 = Domestic Hot Water temperature setpoint de-
creasing push button
2 = Domestic Hot Water temperature setpoint in-
creasing push button
3 = Central Heating water temperature setpoint de-
creasing push button
4 = Central Heating water temperature setpoint in-
creasing push button
5 = Display LCD
6 = Reset / OTC push button
7 = Economy-Comfort / On-Off push button
8 = Domestic Hot Water symbol
9 = Domestic Hot Water mode operation
11 = Multi-function indication (Flashing during heat
exchanger protection)
12 = Economy symbol
13 = Central Heating mode operation
14 = Central Heating symbol
15 = Burner on and actual load indication (Flashing
during flame current supervision)
16 = Service tool connector
915
1312
11 8 1
36
72
16414
Clock
predisposition
5

T-ONE C HE
5EN cod. 3541D730 - Rev. 00 - 05/2013
Indication during boiler operation
Central Heating mode
The Central Heating heat demand (generated by the OpenTherm Remote Control, the Room Thermostat or the Clock)
is indicated by the flashing of the Hot Air symbol over the radiator (part. 13 and 14 - fig. 1). The display indicates the
actual Central Heating water temperature (part. 11 - fig. 1) and during central heating off time the text “d2”.
fig. 2
Domestic hot water mode
The Domestic Hot Water heat demand (generated by the DHW flow sensor or due to a Comfort request) is indicated by
the flashing of the Hot Water symbol under the tap (part. 8 and 9 - fig. 1). The display indicates the actual Domestic Hot
Water temperature (part. 11 - fig. 1) and during domestic hot water off time the text “d1”.
fig. 3
1.3 Turning ON and OFF
Without main power supply
fig. 4 - Boiler without main power supply
BTo avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all water from
the system.

T-ONE C HE
6EN
cod. 3541D730 - Rev. 00 - 05/2013
Ignition
Ensure the power is on to the appliance.
fig. 5 - Ignition fig. 6 - Air purge
• For the firsts 300 seconds, the display shows FH that identifies the Air purge function.
• During the first 5 seconds, the display shows the software version of the pcb.
• Open the gas cock on the boiler and purge the air from the pipework upstream of the gas valve.
• When the FH disappears, the boiler is ready to function automatically whenever the external controls are calling for heat.
Turning off
Press the on/off button (part. 7 - fig. 1) for 5 seconds.
fig. 7 - Turning off
When the boiler is turned off with this key, the p.c.b is still powered, heating operation is disabled and the display is off
however the frost protection will still be active.
To totally isolate close the gas cock ahead of the boiler and disconnect electrical power.
BTo avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all water from
the system.
To turn boiler on again, press the on/off button (part. 7 - fig. 1) for 5 seconds
fig. 8
The boiler is ready to function automatically whenever the external controls are calling for heat.

T-ONE C HE
7EN cod. 3541D730 - Rev. 00 - 05/2013
1.4 Adjustments
Heating temperature setting
To set the system flow temperature, use the CH push buttons (part. 3 and 4 - fig. 1). It can be varied from a minimum
of 20°C to a maximum of 80°C.
fig. 9
Domestic hot water temperature setting
To set the hot water temperature, use the DHW push buttons (part. 1 and 2 - fig. 1). It can be varied from a minimum of
40°C to a maximum of 55°C.
fig. 10
Room temperature adjustment (using a room thermostat)
Using the room thermostat, set the temperature desired. Controlled by the room thermostat, the boiler lights and heats
the system water to the system delivery setpoint temperature. The burner shuts down when the desired temperature in
the room is reached.
AA room thermostat and programmer are a mandatory requirement (Building regulations Doc ‘L’ 2002).
Room temperature adjustment (using an optional Remote Control)
Using the remote control, set the temperature desired. The flow temperature will be controlled by the remote control.
For settings and other informations, see the relative manual.
Economy/Comfort selection
The unit is equipped with a special internal device that ensures a high hot-water delivery speed and excellent user com-
fort. When comfort mode is active the water in the boiler is maintained at a pre-determined temperature, which means
that hot water is available at the boiler outlet as soon as a tap is opened, ie with no waiting.
The user can turn the device off (ECO mode) by pressing economy/comfort button (part.7 - fig. 1).
In ECO mode the display shows the relevant symbol (part. 12 - fig. 1). To turn on COMFORT mode, press economy/
comfort button (part. 7 - fig. 1) again, the ECO symbol will vanish from the display.
Outside temperature compensation
When the (optional) external sensor kit is fitted to the appliance, the system can work in Outside temperature compen-
sation mode. In O.T.C. mode the temperature of the heating system is controlled according to the external climate con-
ditions, this will guarantee a high degree of comfort and energy saving all year round.
By the CH push buttons (part. 3 and 4 - fig. 1) is possible to set the maximum flow temperature for the installation.

T-ONE C HE
8EN
cod. 3541D730 - Rev. 00 - 05/2013
O.T.C. setting
To enter the OTC mode, press OTC button (part. 6 - fig. 1) for 5 seconds.
The display shows CU flashing (fig. 11); to set Curve, use the DHW push buttons (part. 1 and 2 - fig. 1). It can be varied
from 1 to 10, in accordance with the chart (fig. 13). O means no O.T.C. mode.
It is recommended a start point of 20 - 30°C and a flow temperature of 85°C is required for the UK (Curve 9 or 10).
fig. 11
By pressing the CH push buttons (part. 3 e 4 - fig. 1), the display shows OF flashing (fig. 12); to set Offset, use the DHW
push buttons (part. 1 and 2 - fig. 1). It can be varied from 20 to 40, in accordance with the chart (fig. 14).
fig. 12
To exit the OTC mode, press OTC button (part. 6 - fig. 1) for 5 seconds.
fig. 13 - Compensation curves
fig. 14 - Example of compensation parallel curve offset
20
30
40
50
60
70
80
90
85
20 10 0 -10 -20
1
2
3
4
5
68910 7
Maximum oiler flow temperature
Outside Air Temperature
20
30
40
50
60
70
80
90
85
20 10 0 -10 -20
1
2
3
4
5
6
8910 7
20 10 0 -10 -20
20
30
40
50
60
70
80
90
85
1
2
3
4
568910 7
OFFSET = 20 OFFSET = 40
Maximum oiler flow temperature
Outside Air Temperature
Maximum oiler flow temperature
Outside Air Temperature

T-ONE C HE
9EN cod. 3541D730 - Rev. 00 - 05/2013
2. Installation
2.1 General Instructions
BThis unit must only be used for its intended purpose. This unit is designed to heat water to a temperature below
boiling point and must be connected to a heating system and/or a water supply system for domestic use, com-
patible with its performance, characteristics and heating capacity. Any other use is deemed improper.
THE BOILER MUST ONLY BE INSTALLED BY QUALIFIED PERSONNEL, IN COMPLIANCE WITH ALL THE IN-
STRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT LAW, THE REQUIRE-
MENTS OF THE TECHNICAL STANDARDS (BS) AND ANY LOCAL REGULATIONS AND THE RULES OF PROPER
WORKMANSHIP.
Incorrect installation can cause damage or injury for which the manufacturer cannot be deemed responsible.
The unit must be installed in compliance with these instructions and the following standards applicable in
Great Britain.
Gas Safety Regulations (Installations & Use).
Local Building Regulations.
The Building Regulations (Part L).
The Buildings Standards (Scotland - Consolidated) Regulations).British Standards Codes of Practice (BSI):
Model Water By-Laws (Great Britain)
For Northern Ireland the relevant laws in force must be observed.
Safe handling of materials
Pay attention when handling the boiler insulation panels because the material they are made of could irritate the skin.
No part of the boiler contains asbestos, mercury or CFC's.
Advice for transport and handling
For lifting and transport always take suitable safety precautions: keep your back straight, bend knees, do not turn your
body, move feet, avoid bending forward or sideways and keep the load as close as possible to your body.
If possible, use a trolley or other suitable means to carry the boiler.
Grip the boiler firmly and, before lifting it, try and find the point where the load is concentrated in order to establish the
centre of gravity and suitably reposition yourself. Ideally seek assistance in lifting the boiler.
B.S. 5440 Part 1 Flues
B.S. 5440 Part 2 Air flow and ventilation
B.S. 5449 ......... Forced circulation hot water production systems
B.S. 6798 ......... Installation of gas-fired boilers for hot water
B.S. 6891 ......... Gas systems
B.S. 7671 ......... IEE wiring system standards
B.S. 4814 ......... Specifications for expansion tanks
B.S. 5482 ......... LPG systems
B.S. 7593 ......... Water treatment in central heating systems for DHW production
B.S. 5546 ......... Installation of systems for DHW production
B.S. 5955-8 ......... Installation of plastic pipes

T-ONE C HE
10 EN
cod. 3541D730 - Rev. 00 - 05/2013
2.2 Place of installation
The combustion circuit is sealed with respect to the
place of installation and therefore the unit can be in-
stalled in any room. However, the place of installation
must be sufficiently ventilated to prevent the creation
of dangerous conditions in case of even slight gas
leaks. This safety regulation is provided for by EEC Di-
rective no. 90/396 for all gas units, including those with
a sealed chamber.
In any case, the place of installation must be free of dust,
flammable materials or objects or corrosive gases.
The boiler is arranged for wall mounting and comes
standard with a hanging bracket. A paper template for
marking the drilling points on the wall is provided in the
box. The wall fixing must ensure stable and effective
support for the generator.
AIf the unit is enclosed in a cabinet or mounted
alongside, a space must be provided for re-
moving the casing and for normal mainte-
nance operations. The minimum
measurements to be respected are given in
fig. 15.
fig. 15 - Minimum distances around the boiler
AMin. 2,5 cm
BMin. 10 cm
CMin. 30 cm
DMin. 30 cm (via an openable panel)
2.3 Plumbing connections
Important
The heating capacity of the boiler must be previously established by calculating the building's heat requirement according
to the current regulations. To ensure proper operation and long boiler life, the plumbing system must be adequately sized
and complete with all the necessary accessories, including a room thermostat, a thermostatic radiator valve (TRV), etc.
The system flow and return pipes must have a diameter of at least 22 mm for the first 3 m of length from the unit.
If the system delivery and return pipes follow a path where air pockets could form in certain places, it is advisable to
install vent valves at these points. Also, install type "A" drain cocks at the lowest points in the system to allow complete
emptying.
The temperature drop between the delivery manifold and the return to the boiler should not exceed 20 °C.
A flow rate of at least 6 litres/min through the heat exchanger is required. Bypass installed in the boiler guarantees main-
taining of the required flow rate.
BDo not use the water system pipes to earth electrical appliances.
Before installation, carefully flush all the heating system pipes to remove any residuals or impurities that could affect
proper operation of the unit (as required by BS 7593 Building regs Doc L).
Carry out the connections to the unit as indicated in fig. 34.
BThe safety valve discharge must be connected to a 15 mm diameter copper pipe descending from the boiler
to run off system water in case of overpressure in the heating circuit. Otherwise, the boiler manufacturer
cannot be held liable if the discharge valve operates and floods the room. The discharge must be run
to the outside of the building to prevent the risk of damage or injury caused by discharged hot water in case
of overpressure in the system.
Connections to the boiler are to be made in such a way as to ensure that its internal pipes and fittings are free of stress.
If a non-return valve is installed also on the DHW circuit (if provided for), it is necessary to install a safety valve between
the boiler and circuit (with non-return valve at least 3 metres from the boiler) or an expansion tank for domestic use.
D
A A
B
C

T-ONE C HE
11EN cod. 3541D730 - Rev. 00 - 05/2013
Shutoff valve kit
The shutoff valves supplied (see fig. 16) must be installed between the boiler and heating system to allow the boiler to
be isolated from the system if necessary.
fig. 16 - Shutoff valve kit
ADelivery cock 3/4”
BDomestic hot water outlet connection 1/2”
CGas cock 1/2” (yellow)
DCold water inlet connection 1/2”
FSystem return cock 3/4”
MManometer
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 heat-
ing system and the mains water supply. The use of mains water to charge and pressurise the system directly, is con-
ditional upon the Local Water Byelaws. Again any such connection must be disconnected after use. Ensure the filling
point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
Filling system in fig. 17 is supplied with boiler.
B
C
DF
A
M
Key
1. C.H. filling valve
2. Temporary connection
3. Cold water supply valve
4. Double check valve
fig. 17 - Filling system (supplied with boiler)

T-ONE C HE
12 EN
cod. 3541D730 - Rev. 00 - 05/2013
Water treatment
If treatment of the water is necessary, Ferroli recommends the exclusive use of specific products such as Fernox or
Sentinel to be applied in compliance with the producer's instructions. For more information, please contact:
AIf the boiler is installed in an existing system, it is necessary to remove any unsuitable additives by thoroughly
cleaning the system. Cleaning of all the systems must be carried out in compliance with the provisions of
Standard B.S. 7593.
AIn areas characterised by the presence of hard water, treatment may be necessary to prevent the formation
of encrustations in the boiler.
AMake sure to use the water treatment product in the correct concentration, in compliance with the producer's
instructions.
2.4 Connection to the gas system
If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to establish the avail-
ability 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.
Appliance inlet working pressure must be 20mbar MINIMUM, for NG and 37 mbar minimum for LPG.
Do not use pipes of a smaller size than the combination boiler inlet gas connection (22 mm).
BThe complete installation must be tested for gas soundness and purged as described in BS689. All pipework
must be adquately supported. An isolating gas valve is provided and should be fitted on the boiler gas inlet.
Please wait 10 minutes when lighting from cold before checking. Gas pressures should be checked after the
boiler has operated for 10 minutes to reach thermal equilibrium. This appliance has no facility to check the
burner pressure, however if the inlet pressure and the gas rate are correct the boiler should be set correctly,
the gas valve is set and sealed at the factory and should not be adjusted without authorisation from Ferroli
Personnel. A combustion test can be carried out to ensure correct air/gas mix (see page 28 combustion an-
alyser testing).
The isolation kit shown in fig. 16 is supplied as standard.
2.5 Electrical connections
The unit must be installed in conformity with current national and local regulations.
Connection to the electrical grid
BThe unit's electrical safety is only guaranteed when correctly connected to an efficient earthing system exe-
cuted according to current safety standards. Have the efficiency and suitability of the earthing system checked
by professionally qualified personnel. The manufacturer is not responsible for any damage caused by failure
to earth the system. Also make sure that the electrical system is adequate for the maximum power absorbed
by the unit, as specified on the boiler dataplate.
The boiler is prewired and provided with a cable and plug for connection to the electricity supply. The connections to
the grid must be made with a permanent connection and equipped with a bipolar switch whose contacts have a minimum
opening of at least 3 mm, interposing fuses of max. 3A between the boiler and the line. It is important to respect the
polarities (LINE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green wire) in making connections to the electrical
supply. During installation or when changing the power cable, the earth wire must be left 2 cm longer than the others.
BThe user must never change the unit's power cable. If the cable gets damaged, switch off the unit and have it
changed solely by professionally qualified personnel. If changing the electric power cable, use solely “HAR
H05 VV-F” 3x0.75 mm2 cable with a maximum outside diameter of 8 mm.
Fernox Manufacturing Co. LTD.
Cookson Electronics, Forsyth Road
Sheerwater, Woking, Surrey, GU21 5RZ
Tel.: [phone]
Sentinel Performance Solutions Ltd
The Heath Business & Technical Park
Runcorn, Cheshire WA7 4QX
Tel.: [phone]

T-ONE C HE
13EN cod. 3541D730 - Rev. 00 - 05/2013
Accessing electrical terminal block
The electrical connections terminal block can be accessed after removing the casing. The layout of the terminals for the
various connections is given in the wiring diagram in fig. 39.
fig. 18 - Electrical terminal block
Room thermostat (optional)
BCAUTION: THE ROOM THERMOSTAT MUST HAVE VOLTAGE FREE SWITCH CONTACTS.
CONNECTING 240V TO THE SWITCH TERMINALS OF THE BOILER WILL IRREPARABLY DAMAGE THE
BOILER PCB.
When connecting either a room thermostat or remote timer control, remove the jumper on the terminal block
and connect the volt free switch connections across these terminals. If a remote timer control and room ther-
mostat are required then these must be connected in series.
138
ON/OFF
SWITCH
(configura le)
72
1 2 3 4 5 6
139

T-ONE C HE
14 EN
cod. 3541D730 - Rev. 00 - 05/2013
2.6 Flue system
This unit is a "C type" with sealed chamber and forced draught, with air inlet and flue exhaust to be connected to one
of the following flue systems. Before installation, with the aid of the tables and calculation methods given, check that the
pipes of the fume system do not exceed the maximum permissible lengths. The current standards and local regulations
must be observed.
BOnly a Ferroli flue system (with respective accessories) must be used with this unit, as required by BS 5440
and CE standards.
Connection with coaxial pipes
Standard connection with coaxial pipes (code 041049G0)
fig. 19 - Standard connection
Horizontal flue installation
1. Define the position for installing the unit.
2. If using standard flue (041049G0) this must be installed level. For extended horizontal flue lengths over 1m a fall of
3 mm per metre of the flue exhaust should be incorporated back to the boiler.
3. Make a hole of diameter 10 - 20 mm greater than the nominal diameter of the concentric pipe used.
4. If necessary, cut the terminal length to size, ensuring that the external pipe protrudes from the wall by between 10
and 60 mm. Remove the cutting burrs.
5. Connect flue to the boiler, positioning the seals correctly. Seal the flue into the wall with silicone or sand + cement
and cover with wall seals provided.
AFlue seals should be lubricated with a silicone type grease to prevent damage (grease not supplied).
Between
10 e 60 mm
Between
10 e 60 mm
320
125
200
80600
Ø100
125
110
80600
Ø100
Drill the wall 10÷20 mm
more than the
pipe diameter
Rear outlet
Side view
Side outlet
Front view
200
400

T-ONE C HE
15EN cod. 3541D730 - Rev. 00 - 05/2013
Other coaxial connections
fig. 20 - Examples of connection with coaxial pipes ( = Air / = Fumes)
For coaxial connection, fit the unit with one of the following starting accessories. For the wall hole dimensions, refer to
section 4.1 Dimensions and connections.
fig. 21 - Starting accessory for coaxial ducts
Before proceeding with installation, check with table 1 that the maximum permissible length is not exceeded, bearing in
mind that every coaxial bend gives rise to the reduction indicated in the table. For example, a Ø 60/100 duct comprising
a 90° bend + 1 horizontal metre has a total equivalent length of 2 metres.
Table. 1 - Max. length coaxial ducts
Coaxial 60/100 Coaxial 80/125 Coaxial 80/125
T-ONE
25C HE
T-ONE
30C HE
T-ONE
25C HE
T-ONE
30C HE
Max permissible (horizontal)
equivalent flue length 7 m 7 m
28 m 28 m
Max permissible (vertical)
equivalent flue length 8 m 8 m
Reduction factor 90° bend 1 m 1 m 0.5 m 0.5 m
Reduction factor 45° bend 0.5 m 0.5 m 0.25 m 0.25 m
C
13
C
13
C
33
C
33
C
33
C
13
Ø 100
Ø 60
120
142
Ø 80
Ø 127
120
147
Ø 100
Ø 60
041002X0 041006X0 041001X0

T-ONE C HE
16 EN
cod. 3541D730 - Rev. 00 - 05/2013
Connection with separate pipes
fig. 22 - Examples of connection with separate pipes ( = Air / = Fumes)
For the connection of separate ducts, fit the unit with the following starting accessory:
fig. 23 - Starting accessory for separate ducts
Before proceeding with installation make sure the maximum permissible length has not been exceeded, by means of a
simple calculation:
1. Completely establish the layout of the system of split flues, including accessories and outlet terminals.
2. Consult the table 3 and identify the losses in meq (equivalent metres) of every component, according to the instal-
lation position.
3. Check that the sum total of losses is less than or equal to the maximum permissible length in table 2.
Table. 2 - Max. length separate ducts
Table. 3 - Accessories
Separate ducts
T-ONE 25C HE T-ONE 30C HE
Max. permissible length 80 meq 70 meq
Losses in meq
Air
inlet
Fume exhaust
Vertical Horizontal
Ø 80 PIPE 1 m M/F 1.0 1.6 2.0
BEND 45° M/F 1.2 1.8
90° M/F 1.5 2.0
PIPE SECTION with test point 0.3 0.3
TERMINAL air, wall 2.0 -
fumes, wall with antiwind - 5.0
FLUE Split air/fumes 80/80 - 12.0
Ø 81Ø 81
Ø 65
Ø 87
Ø 65
041039X0

T-ONE C HE
17EN cod. 3541D730 - Rev. 00 - 05/2013
Position of terminals
fig. 24
Minimum dimensions of fume exhaust terminals
ADirectly under an opening, air inlet, openable window, etc. 300 mm
BAbove an opening, air inlet, openable window, etc. 300 mm
CHorizontally to an opening, air inlet, openable window, etc. 300 mm
DUnder gutters, drain pipes 75 mm
EUnder cornices or under eaves 200 mm
FUnder balconies or garages 200 mm
GFrom a drain pipe or a vertical drain pipe 150 mm
HFrom an internal or external corner 100 mm
IAbove ground level, a roof or balcony 300 mm
JFrom a surface facing the terminal 600 mm
KFrom a terminal facing the terminal 1200 mm
LFrom a garage opening (e.g. door, window) with access to the home 1200 mm
MVertically from a terminal on the same wall 1500 mm
NHorizontally from a terminal on the same wall 300 mm
OFrom the wall on which the terminal is fitted N/A
PFrom a vertical structure on the roof 150 mm
QAbove the intersection with the roof 300 mm
NOTES
•N/A = Not applicable
• Also, the terminal must be at least 150 mm (in case of forced intake) from an opening made in the structure of the build-
ing to house a fitted element such as a window frame.
• Positions of condensate drain terminals: if the fume exhaust is provided for at a low level, the potential effect of the flue
gas cloud must be considered. Special flue gas management kits are available by request.
• The flue gas cloud must not be directed towards:
- A frequented approach
- A window or door
- An adjacent property
P
D, E
Q
Q
l
BC
A
G
F
L
J
HH
K
N
N
MM
Q

T-ONE C HE
18 EN
cod. 3541D730 - Rev. 00 - 05/2013
Connection to multiple flues or single flues with natural draught
To connect the T-ONE C HE boiler to a multiple flue or a single flue with natural draught, the flue or chimney must be expressly
designed by professionally qualified technical personnel in conformity with the current standards and regulations.
In particular, flues and chimneys must:
• Be sized according to the method of calculation given in the standard.
• Be tight with respect to the products of combustion, resistant to the fumes and heat and impermeable to condensate.
• Have a circular or square cross-section (some hydraulically equivalent sections are permissible), with a vertical pro-
gression and with no constrictions.
• Have the ducts conveying the hot fumes at a suitable distance or separately from combustible materials.
• Be connected to just one unit per floor, for not more than 6 units (8 if there is a compensation duct or opening).
• Have no mechanical suction devices in the main ducts.
• Be at low pressure, all along their length, in conditions of stationary operation.
• Have at their base a collection chamber for solid materials or condensate, of at least 0.5 m, equipped with an airtight
metal door.
2.7 Condensate drain connection
Installation
The boiler is equipped with an internal air-trap to drain off the condensate.
Fit the inspection coupling Aand the hose B, pushing it on for approximately 3 cm and securing it with a clamp.
Fill the air-trap with approximately 0.5 ltrs of water and connect the hose to the waste system, or soakaway.
fig. 25
0,5lt
B
A
3 cm

T-ONE C HE
19EN cod. 3541D730 - Rev. 00 - 05/2013
Condensate drain
If possible, the condensate should be conveyed inside the internal drainage system or pipe. For that purpose, use a
pipe of at least 22 mm diameter and a trap with flexible connection supplied with the unit to facilitate connection of the
condensate drain pipe.
The pipe must be in glue-joined plastic and not in copper, since the condensate has a pH of 4 (slightly acid).
If the condensate drain pipe cannot be ended on the inside, it is advisable to run it outside as shown in the following
figure.
The pipe sections going to the outside are exposed to the risk of freezing in particularly extreme weather conditions. To
prevent this from occurring, it is advisable to reduce the length of the condensate drain pipes and run them on the inside,
as much as possible, before going to the outside. It may also be necessary to insulate the condensate pipe or apply a
trace heating device to prevent freezing of the condensate.
The pipes outside the building must be in glue-joined plastic with increased diameter of up to 32 or 40 mm with a max-
imum run of 3m for connection to a condensate collection soakaway or external drain.
If using a condensate collection soakaway, it must be as indicated in the figure below, or use a specific system (such
as Mc Alpine SOAK1GR) available from the majority of suppliers of products and accessories for plumbing or heating
systems.
fig. 26 - Condensate drain
External
32/40mm Solvent weld pipework 2.5 * Minimum Fall see elow
Cement seal
100mm Dia tu e
Bottom sealed
Lime stone chippings
Ground level (either/Or)
Hole depth 400mm
25mm
2 Rows of
3x12 mm Holes
Internal
-300mm

T-ONE C HE
20 EN
cod. 3541D730 - Rev. 00 - 05/2013
3. Service and maintenance
All adjustment, conversion, startup and maintenance operations described below must only be carried out by Qualified Per-
sonnel (meeting the professional technical requirements prescribed by current regulations).
FERROLI declines any liability for damage and/or injury caused by unqualified and unauthorised persons tampering with
the unit.
3.1 Adjustments
Gas supply conversion
The unit can operate on natural gas or LPG and is factory-set for use with one of these two gases, as clearly shown
onthe packing and on the dataplate. If a gas different from that for which the unit is arranged has to be used, a conver-
sion kit will be required, proceeding as follows (fig. 27):
1. Disconnect the power supply and close the gas cock upstream.
2. Remove the front panel.
3. Turn the control panel.
4. Unscrew the nut “C” and remove gas pipe “A” from the gas valve.
5. Replace injector “B”, inserted in the gas pipe, with that contained in the conversion kit.
6. Reassemble gas pipe “A” with the clip and check the seal of the connection.
7. Apply the label, contained in the conversion kit, near the dataplate.
8. Connect the power supply and open the gas cock upstream
9. Refit the front panel.
10. Modify the parameter for the type of gas:
• put the boiler in standby mode
• press the DHW buttons details 1 and 2 - fig. 1 for 10 seconds: the display shows “b01“ flashing.
• press the DHW buttons fig. 1 details 1 and 2 - to set parameter 00 (for use with natural gas) or 01 (for use withLPG ).
• press the DHW buttons details 1 and 2 - fig. 1 for 10 seconds.
• the boiler will return to standby mode
11. Check the working pressure
12. Using a combustion analyser connected to the boiler fume outlet, check that the CO2content in the fumes, withthe
boiler operating at max. and min. power, matches that given in the technical data table for the corresponding type
of gas.
fig. 27 - Changing the gas nozzle
A
C
B
gasket