Page 1
3540I371
cod. 3540I371 — 06/2008 (Rev. 00)
ECONCEPT TECH 25 C
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
Page 2
ECONCEPT TECH 25 C
2 EN
B
Declaration of conformity
Manufacturer: FERROLI S.p.A.
Address: Via Ritonda 78/a 37047 San Bonifacio VR Italy
declares that this unit complies with the following EU directives:
• Gas Appliance Directive 90/396
• Efficiency Directive 92/42
• Low Voltage Directive 73/23 (amended by 93/68)
• Electromagnetic Compatibility Directive 89/336 (amended by 93/68)
President and Legal Representative
Cav. del Lavoro
Dante Ferroli
B
This 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.
A
This symbols calls attention to a note or important notice.
cod. 3540I371 - 06/2008 (Rev. 00)
• 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 future 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 current regulations and the manufacturer's instructions.
• Incorrect installation or poor maintenance can cause
damage or physical injury. The manufacturer declines any responsibility for damage caused by errors in installation and use or by failure to follow the
manufacturer's instructions.
• Before carrying out any cleaning or maintenance op-
eration, disconnect the unit from the electrical power
supply using the switch and/or the special cut-off devices.
• 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 personnel using exclusively genuine parts. Failure to comply with the above could affect the safety of the unit.
• Periodical maintenance carried out by qualified personnel 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 improper 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.
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ECONCEPT TECH 25 C
3
3540I371
cod. 3540I371 - 06/2008 (Rev. 00)
1 Operating instructions ............................................................................................................4
1.1 Introduction............................................................................................................................................. 4
1.2 Control panel .......................................................................................................................................... 4
1.3 Turning on and off ..................................................................................................................................6
1.4 Adjustments............................................................................................................................................ 7
2 Installation.............................................................................................................................. 11
2.1 General Instructions .............................................................................................................................11
2.2 Place of installation ..............................................................................................................................11
2.3 Plumbing connections .......................................................................................................................... 11
2.4 Gas connection ....................................................................................................................................12
2.5 Electrical connections........................................................................................................................... 12
2.6 Fume ducts........................................................................................................................................... 14
2.7 Condensate drain connection...............................................................................................................18
3 Service and maintenance......................................................................................................19
3.1 Adjustments.......................................................................................................................................... 19
3.2 Start-up.................................................................................................................................................21
3.3 Maintenance......................................................................................................................................... 21
3.4 Troubleshooting.................................................................................................................................... 23
4 Technical data and characteristics ...................................................................................... 25
4.1 Dimensions and connections ...............................................................................................................25
4.2 General view and main components .................................................................................................... 26
4.3 Plumbing circuit .................................................................................................................................... 27
4.4 Technical data table .............................................................................................................................28
4.5 Diagrams .............................................................................................................................................. 29
4.6 Wiring diagram .....................................................................................................................................30
Page 4
ECONCEPT TECH 25 C
4 EN
cod. 3540I371 - 06/2008 (Rev. 00)
1. Operating instructions
1.1 Introduction
Dear Customer,
Thank you for choosing ECONCEPT TECH 25 C, a FERROLI wall-mounted boiler featuring advanced design, cutting-
edge technology, high reliability and quality construction. Please read this manual carefully since it provides important
information on safe installation, use and maintenance.
ECONCEPT TECH 25 C is a high-efficiency and low emissions, sealed chamber premix condensing heat generator
for heating and domestic hot water production, running on natural gas or LPG and equipped with a microprocessor control system.
The boiler shell consists of an aluminium laminar exchanger and a premix burner (ceramic) equipped with electronic
ignition and ionisation flame control, modulating speed fan and modulating gas valve.
1.2 Control panel
fig. 1 - Control panel
Key
1 = DHW temperature setting decrease button
2 = DHW temperature setting increase button
3 = Heating system temperature setting decrease
button
4 = Heating system temperature setting increase
button
5 = Display
6 = "Sliding Temperature" menu - Summer/Winter
mode selection - Reset button
7 = Unit On/Off - Economy/Comfort mode selection
button
8 = DHW symbol
9 = DHW operation
10 = Summer mode
11 = Multifunction indication (flashing during ex-
changer protection function)
12 = Eco (Economy) mode
13 = Heating operation
14 = Heating symbol
15 = Burner On and actual power (flashing during
flame protection function)
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89
15
1314
12
11
10
21
436
75
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ECONCEPT TECH 25 C
5EN
cod. 3540I371 - 06/2008 (Rev. 00)
Indication during operation
Heating
A heating demand (generated by the Room Thermostat or Remote Timer Control) is indicated by flashing of the hot air
above the radiator (details 13 and 14 - fig. 1).
The display (detail 11 - fig. 1) shows the actual heating delivery temperature and during DHW standby time, the message “d2”.
fig. 2
Domestic hot water (DHW)
A DHW demand (generated by drawing domestic hot water) is indicated by flashing of the hot water under the tap (details 8 and 9 - fig. 1).
The display (detail 11 - fig. 1) shows the actual DHW outlet temperature and during DHW standby time, the message
“d1“.
fig. 3
Comfort
A Comfort demand (restoration of temperature inside the boiler), is indicated by flashing of the water under the tap (detail 9 - fig. 1).
The display (detail 11 - fig. 1) shows the actual temperature of the water contained in the boiler.
fig. 4
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ECONCEPT TECH 25 C
6 EN
cod. 3540I371 - 06/2008 (Rev. 00)
1.3 Turning on and off
Boiler lighting
Switch on the power to the unit.
fig. 5 - Boiler lighting
• For the following 120 seconds the display will show FH which identifies the heating system air venting cycle.
• During the first 5 seconds the display will also show the card software release.
• Open the gas cock ahead of the boiler.
• When the message FH disappears, the boiler will be ready to operate automatically whenever domestic hot water
is drawn or in case of a room thermostat demand.
Turning the boiler off
Press the button (detail 7 - fig. 1) for 5 seconds.
fig. 6 - Turning the boiler off
When the boiler is turned off, the electronic board is still powered.
Domestic hot water and heating operation are disabled. The antifreeze system remains activated.
To relight the boiler, press the button (detail 7 fig. 1) again for 5 seconds.
fig. 7
The boiler will be immediately ready to operate whenever domestic hot water is drawn or in case of a room thermostat
demand.
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ECONCEPT TECH 25 C
7EN
cod. 3540I371 - 06/2008 (Rev. 00)
B
The antifreeze system does not work when the power and/or gas to the unit are turned off. To avoid damage
caused by freezing during long idle periods in winter, it is advisable to drain all water from the boiler, DHW
circuit and system; or drain just the DHW circuit and add a suitable antifreeze to the heating system, complying
with that prescribed in sec. 2.3.
1.4 Adjustments
Summer/Winter changeover
Press the button (detail 6 - fig. 1) for 2 seconds.
fig. 8
The display activates the Summer symbol (detail 10 - fig. 1): the boiler will only deliver domestic hot water. The antifreeze system remains activated.
To deactivate Summer mode, press the button (detail 6 - fig. 1) again for 2 seconds.
Heating temperature adjustment
Operate the heating buttons (details 3 and 4 - ) to adjustfig. 1the temperature from a min. of 20 °C to a max.
of 90 °C.
fig. 9
Domestic hot water (DHW) temperature adjustment
Operate the DHW buttons (details 1 and 2 - fig. 1) to adjust the temperature from a min. of 40 °C to a max.
of 55°C.
fig. 10
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ECONCEPT TECH 25 C
8 EN
cod. 3540I371 - 06/2008 (Rev. 00)
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature desired in the rooms. If the room thermostat is not installed the boiler
will keep the heating system at its setpoint temperature.
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the temperature desired in the rooms. The boiler unit will set the system water according to the required room temperature. For information on the remote timer control, please refer to its user's manual.
ECO/COMFORT selection
The unit is equipped with a function that ensures a high domestic hot water delivery speed and maximum comfort for
the user. When the device is activated (COMFORT mode), the water contained in the boiler is kept hot, therefore ensuring immediate availability of hot water on opening the tap, without waiting times.
The device can be deactivated by the user (ECO mode) by pressing the button (detail 7 -
fig. 1
). In ECO mode the display
activates the ECO symbol (detail 12 -
fig. 1
). To activate COMFORT mode, press the button (detail 7 -
fig. 1
) again.
Sliding temperature
When the optional external probe is installed the boiler adjustment system works with "Sliding Temperature”. In this
mode, the temperature of the heating system is adjusted according to the outside weather conditions, in order to ensure
high comfort and energy saving throughout the year. As the outside temperature increases, the temperature of the heating system is decreased according to a fixed “compensation curve”.
With Sliding Temperature adjustment, the temperature set with the heating buttons (details 3 and 4 - fig. 1)
becomes the maximum system delivery temperature. It is advisable to set a maximum value to allow system adjustment
throughout its useful operating range.
The boiler must be adjusted at the time of installation by qualified personnel. Possible adjustments can in any case be
made by the user to improve comfort.
Compensation curve and curve offset
Press the button (detail 6 -
fig. 1
) for 5 seconds to access the "Sliding temperature" menu; "CU" appears flashing (
fig. 11
).
Operate the DHW buttons (details 1 and 2 - fig. 1) to adjust the required curve from 1 to 10 according to the
characteristic (fig. 13). By setting the curve to 0, sliding temperature adjustment is disabled.
fig. 11 - Compensation curve
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ECONCEPT TECH 25 C
9EN
cod. 3540I371 - 06/2008 (Rev. 00)
Press the heating buttons (details 3 and 4 - fig. 1) to access parallel curve offset; "OF" appears flashing
(fig. 12). Operate the DHW buttons (details 1 and 2 - fig. 1) to adjust parallel curve offset according to the
characteristic (fig. 14).
fig. 12 - Parallel curve offset
Press the button (detail 6 - fig. 1) again for 5 seconds to exit the “Sliding Temperature” menu.
If the room temperature is lower than the required value, it is advisable to set a higher order curve and vice versa. Pro-
ceed by increasing or decreasing in steps of one and check the result in the room.
fig. 13 - Compensation curves
fig. 14 - Example of parallel compensation curve shift
A
If the Remote Timer Control (optional) is connected to the boiler, the above adjustments are managed according to that given in table 1.
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20
30
40
50
60
70
80
90
85
20 10 0 -10 -20
1
2
3
4
5
68910 7
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
Page 10
ECONCEPT TECH 25 C
10 EN
cod. 3540I371 - 06/2008 (Rev. 00)
Table. 1
Water system pressure adjustment
The filling pressure with system cold, read on the boiler water gauge, must be approx. 1.0 bar. If the system pressure
falls to values below minimum, the boiler card will activate fault F37 (fig. 15).
fig. 15 - Low system pressure fault
Operate the filling cock (detail 1 - fig. 16) and bring the system pressure to a value above 1.0 bar.
fig. 16 - Filling cock
A
Once the system pressure is restored, the boiler will activate the 120-second air venting cycle indicated on the
display by FH.
At the end of the operation always close the filling cock (detail 1 - fig. 16)
Heating temperature adjustment Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.
DHW temperature adjustment Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.
Summer/Winter changeover Summer mode has priority over a possible Remote Timer Control heating
demand.
Eco/Comfort selection On disabling DHW from the Remote Timer Control menu, the boiler selects
the Economy mode. In this condition, the button (detail 7 - fig. 1) on the
boiler panel is disabled.
On enabling DHW from the Remote Timer Control menu, the boiler selects
the Comfort mode. In this condition it is possible select one of the two modes
with the button (detail 7 - fig. 1) on the boiler panel.
Sliding Temperature Both the Remote Timer Control and the boiler card manage Sliding Tempera-
ture adjustment: of the two, the boiler card Sliding Temperature has priority.
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ECONCEPT TECH 25 C
11EN
cod. 3540I371 - 06/2008 (Rev. 00)
2. Installation
2.1 General Instructions
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL, IN ACCORDANCE WITH
ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRESCRIPTIONS OF NATIONAL STANDARDS AND LOCAL REGULATIONS AND THE RULES OF PROPER WORKMANSHIP
2.2 Place of installation
The combustion circuit is sealed with respect to the place of installation, therefore the unit can be installed in any room.
However, the place of installation must be sufficiently ventilated to prevent the creation of any dangerous conditions in
case of even small gas leaks. This safety precaution is required by EEC Directive no. 90/396 for all gas units, including
those with a so-called sealed chamber.
Therefore the place of installation must be free of dust, flammable materials or objects or corrosive gases. The room
must be dry and not subject to freezing.
The boiler is arranged for wall mounting and comes standard with a hooking bracket. The wall fixing must ensure stable
and effective support for the generator.
A
If the unit is enclosed in a cabinet or mounted alongside, a space must be provided for removing the casing
and for normal maintenance operations
2.3 Plumbing connections
The heating capacity of the unit must be previously established by calculating the building's heat requirement according
to current regulations. The system must be provided with all the components for correct and regular operation. It is advisable to install on/off valves between the boiler and heating system allowing the boiler to be isolated from the system
if necessary.
B
The safety valve outlet must be connected to a funnel or collection pipe to prevent water spurting onto the floor
in case of overpressure in the heating circuit. Otherwise, if the drain valve is activated and floods the room,
the boiler manufacturer cannot be held liable.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the system to remove residuals or impurities that could affect correct
operation of the unit.
B
A filter must be installed on the system return piping to prevent impurities or sludge from the system clogging
and damaging the heat generators.
The filter MUST be installed when replacing generators in existing systems. The manufacturer declines any
liability for damage caused to the generator due to failure to install or inadequate installation of this filter.
Make the relevant connections according to the diagram in sec. 4.1 and the symbols given on the unit.
System water charcteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO3), the use of suitably treated water is advisable in order
to avoid possible scaling in the boiler. The treatment must not in any case reduce the hardness to values below 15°F
(Decree 236/88 for uses of water intended for human consumption). Water treatment is indispensable in the case of
very large systems or with frequent replenishing of water in the system. If partial or total emptying of the system becomes necessary in these cases, it is advisable to refill it with treated water.
Page 12
ECONCEPT TECH 25 C
12 EN
cod. 3540I371 - 06/2008 (Rev. 00)
Antifreeze system, antifreeze fluids, additives and inhibitors
The boiler is equipped with an antifreeze system that turns on the boiler in heating mode when the system delivery water
temperature falls under 6°C. The device will not come on if the electricity and/or gas supply to the unit are cut off. If it
becomes necessary, it is permissible to use antifreeze fluid, additives and inhibitors only if the manufacturer of these
fluids or additives guarantees they are suitable for this use and cause no damage to the heat exchanger or other components and/or materials of the boiler unit and system. It is prohibited to use generic antifreeze fluid, additives or inhibitors that are not expressly suited for use in heating systems and compatible with the materials of the boiler unit and
system.
2.4 Gas connection
B
Before making the connection, ensure that the unit is arranged for operation with the type of fuel available and
carefully clean all the pipes of the gas system to remove any residues that could affect good functioning of the
boiler.
The gas must be connected to the relative connector (see fig. 30) in conformity with current standards, with rigid metal
pipes or with continuous flexible s/steel wall tubing, placing a gas cock between the system and the boiler. Make sure
that all the gas connections are tight. The capacity of the gas meter must be sufficient for the simultaneous use of all
equipment connected to it. The diameter of the gas pipe leaving the boiler does not determine the diameter of the pipe
between the unit and the meter; it must be chosen according to its length and loss of head, in conformity with current
standards.
B
Do not use the gas pipes to earth electrical appliances.
2.5 Electrical connections
Connection to the electrical grid
B
The unit's electrical safety is only guaranteed when correctly connected to an efficient earthing system executed 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 Y-cable and plug for connection to the electricity line. 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
line. During installation or when changing the power cable, the earth wire must be left 2 cm longer than the others.
B
The 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.
Room thermostat (optional)
B
CAUTION: The room thermostat must have clean contacts. CONNECTING 230 V. TO THE TERMINALS OF
THE ROOM THERMOSTAT WILL IRREPARABLY DAMAGE THE ELECTRONIC CARD.
When connecting a remote timer control or a timer switch, do not take the power supply for these devices from
their cut-out contacts. Their power supply must be taken with a direct connection from the mains or with batteries, depending on the kind of device.
Page 13
ECONCEPT TECH 25 C
13EN
cod. 3540I371 - 06/2008 (Rev. 00)
External probe (optional)
Connect the probe to its respective terminals. The maximum permissible length for the boiler - external probe connection electrical cable is 50 m. A normal 2-wire cable can be used. The external probe should preferably be installed on
the North, North-West wall or that facing the largest area of living room. The probe must never be exposed to the early
morning sun or, insofar as possible, direct sunlight; protect it if necessary. In any case, the probe must not be installed
near windows, doors, ventilation openings, flues or heat sources that could affect the reading.
fig. 17 - External probe positioning not recommended
Accessing the terminal block
Follow the instructions given in fig. 18 to access the electrical connection terminal block. The layout of the terminals for
the various connections is given in the wiring diagram in fig. 33.
fig. 18 - Accessing the terminal block
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ECONCEPT TECH 25 C
14 EN
cod. 3540I371 - 06/2008 (Rev. 00)
2.6 Fume ducts
The unit is “C type" with sealed chamber and forced draught; the air inlet and fume exhaust must be connected to one
of the exhaust/inlet systems indicated below. The unit is approved for operation with all the Cxy flue configurations specified on the dataplate (some setups are given by way of example in this section). Some configurations may be expressly
limited or not permitted by local regulations, standards or laws. Before proceeding with installation, check and carefully
observe the above-mentioned prescriptions. Also, comply with the provisions concerning the positioning of wall and/or
roof terminals and the minimum distances from windows, walls, ventilation openings, etc.
B
This C-type unit must be installed using the fume exhaust and inlet pipes supplied by the manufacturer in accordance with UNI-CIG 7129/92. Failure to use them automatically invalidates every warranty and relieves the
manufacturer of any liability.
A
For fume exhaust pipes longer than 1 metre, during installation take into account the natural expansion of the
materials when the boiler is operating.
To prevent deformations leave an expansion space of approx. 2-4 mm for every metre of pipe.
fig. 19 - Expansion
2 ÷ 4 mm
Page 15
ECONCEPT TECH 25 C
15EN
cod. 3540I371 - 06/2008 (Rev. 00)
Connection with coaxial pipes
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
sec. 4.1. Any horizontal sections of the fume exhaust must be kept sloping slightly towards the boiler, to prevent possible condensate from flowing back towards the outside and causing dripping.
fig. 21 - Starting accessory for coaxial ducts
Before proceeding with installation, check with table 2 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. 2 - Max. length coaxial ducts
Coaxial 60/100 Coaxial 80/125
Max. permissible length 5 m 15 m
Reduction factor 90° bend 1 m 0.5 m
Reduction factor 45° bend 0.5 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
Page 16
ECONCEPT TECH 25 C
16 EN
cod. 3540I371 - 06/2008 (Rev. 00)
Connection with separate pipes
fig. 22 - Examples of connection with separate pipes ( = Air / = Fumes)
For connection of separate ducts, fit the unit with 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. Establish the layout of the system of split flues, including accessories and outlet terminals.
2. Consult the table 4 and identify the losses in m
eq
(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 3.
Table. 3 - Max. length separate ducts
Separate ducts
Max. permissible length 75 m
eq
C
53
C
33
C
53
B
23
C
13
041003X0
Page 17
ECONCEPT TECH 25 C
17EN
cod. 3540I371 - 06/2008 (Rev. 00)
Table. 4 - Accessories
Connection to collective flues
fig. 24 - Examples of connection to flues ( = Air / = Fumes)
If you are then going to connect the ECONCEPT TECH 25 C boiler to a collective flue or a single flue with natural
draught, the flue must be expressly designed by professionally qualified technical personnel in conformity with the current standards and be suitable for airtight chamber units equipped with a fan.
In particular, flues must have the following characteristics:
• Be sized according to the method of calculation stated in the current standards.
• Be airtight to the products of combustion, resistant to the fumes and heat and waterproof for the condensate.
• Have a circular or quadrangular cross-section, with a vertical progression and with no constrictions.
• Have the ducts conveying the hot fumes adequately distanced or isolated from combustible materials.
• Be connected to just one unit per floor.
• Be connected to just one type of unit (or all and only forced draught units or all and only natural draught units).
• Have no mechanical suction devices in the main ducts.
• Be at a lower pressure, all along their length, under conditions of stationary operation.
• Have at their base a collection chamber for solid materials or condensation equipped with a metal door with an airtight closure.
Losses in m
eq
Air
inlet
Fume exhaust
Vertical Horizontal
Ø 80 PIPE 1 m M/F 1KWMA83W 1.0 1.6 2.0
BEND 45° M/F 1KWMA65W 1.2 1.8
90° M/F 1KWMA01W 1.5 2.0
PIPE SECTION with test point 1KWMA70W 0.3 0.3
TERMINAL air, wall 1KWMA85A 2.0 -
fumes, wall with antiwind 1KWMA86A - 5.0
FLUE Split air/fumes 80/80 1KWMA84U - 12.0
C
83
C
43
C
43
Page 18
ECONCEPT TECH 25 C
18 EN
cod. 3540I371 - 06/2008 (Rev. 00)
2.7 Condensate drain connection
The boiler is equipped with a trap to drain condensate. Fit the inspection connection A and the flexible tube B, pressing
it in about 3 cm and securing it with a clamp. Fill the trap with approx. 0.5 l. of water and connect the flexible tube to the
elimination system.
fig. 25 - Condensate drain connection
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ECONCEPT TECH 25 C
19EN
cod. 3540I371 - 06/2008 (Rev. 00)
3. Service and maintenance
All adjustment, conversion, start-up and maintenance operations described below must only be carried out by Qualified Personnel (meeting the professional technical requirements prescribed by current regulations) such as those of the Local AfterSales Technical Service.
FERROLI declines any liability for damage and/or injury caused by unqualified and unauthorised people 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
on the packing and on the dataplate. Whenever a different gas to that for which the unit is arranged has to be used, a
conversion kit will be required, proceeding as follows:
1. Remove the casing.
2. Open the sealed chamber.
3. Release the fixing clip C and remove the gas pipeA from the fan - venturi assembly.
4. Replace the nozzle B inserted in the gas pipe with that contained in the conversion kit.
5. Reassemble the gas pipe A with the clip and check the seal of the connection.
6. Apply the plate contained in the conversion kit, near the dataplate.
7. Refit the sealed chamber and casing.
8. Modify the parameter for the type of gas:
• switch the boiler to standby mode
• press the DHW buttons (detail 1 and 2 - fig. 1) for 10 seconds: the display shows “P01“ flashing.
• press the DHW buttons (details 1 and 2 - fig. 1) to set the parameter 00 (for operation with natural
gas) or 01 (for operation with LPG).
• press the DHW buttons (details 1 and 2 - fig. 1) for 10 seconds.
• the boiler will return to the standby mode
9. Using a combustion analyser connected to the boiler fume outlet, check that the CO 2 content in the fumes (with
the boiler operating at max. and min. output) complies with the value given in the technical data table for the corresponding gas type.
fig. 26 - Gas supply conversion
Page 20
ECONCEPT TECH 25 C
20 EN
cod. 3540I371 - 06/2008 (Rev. 00)
Activating TEST mode
Press the heating buttons (details 3 and 4 - ) at the same time for 5fig. 1seconds to activate TEST mode.
The boiler lights at the maximum heating power set as described in the following section.
The heating symbol (detail 14 - fig. 1) and DHW symbol (detail 8 - fig. 1) flash on the display; the heating power will be
displayed alongside.
fig. 27 - TEST mode (heating power = 100%)
To deactivate TEST mode, repeat the activation sequence.
In any case, the TEST mode is disabled automatically after 15 minutes.
Heating power adjustment
To adjust the heating power, switch the boiler to TEST mode (see sec. 3.1). Press the heating buttons (details 3 and 4 - fig. 1) to increase or decrease the power (min. = 00 - max. = 100). Press the RESET button within 5
seconds; the max. power will remain that just set. Exit TEST mode (see sec. 3.1).
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Page 21
ECONCEPT TECH 25 C
21EN
cod. 3540I371 - 06/2008 (Rev. 00)
3.2 Start-up
B
Checks to be made at first lighting, and after all maintenance operations that involved disconnection from the
systems or an operation on safety devices or parts of the boiler:
Before lighting the boiler
• Open any on-off valves between the boiler and the systems.
• Check the tightness of the gas system, proceeding with caution and using a soap and water solution to detect any
leaks in connections.
• Check correct prefilling of the expansion tank (ref. sec. 4.4).
• Fill the water system and make sure all air contained in the boiler and the system has been vented, by opening the
air vent valve on the boiler and any vent valves on the system.
• Fill the condensate trap and check correct connection of the condensate elimination system.
• Make sure there are no water leaks in the system, DHW circuits, connections or boiler.
• Check correct connection of the electrical system and efficiency of the earthing system
• Make sure the gas pressure value for heating is that required.
• Make sure there are no flammable liquids or materials in the immediate vicinity of the boiler
Checks during operation
• Turn the unit on as described in sec. 1.3.
• Make sure the fuel circuit and water systems are tight.
• Check the efficiency of the flue and air-fume ducts while the boiler is working.
• Check the correct tightness and functionality of the condensate elimination system and trap.
• Make sure the water is circulating properly between the boiler and the systems.
• Make sure the gas valve modulates correctly in the heating and domestic hot water production phases.
• Check proper boiler lighting by doing several tests, turning it on and off with the room thermostat or remote control.
• Using a combustion analyser connected to the boiler fume outlet, check that the CO
2
content in the fumes, with the
boiler operating at max. and min. output, corresponds to that given in the technical data table for the corresponding
type of gas.
• Make sure the fuel consumption indicated on the meter matches that given in the technical data table on sec. 4.4.
• Check the correct programming of the parameters and carry out any necessary customization (compensation curve,
power, temperatures, etc.).
3.3 Maintenance
Periodical check
To keep the unit working properly over time, it is necessary to have qualified personnel make an annual check that includes the following tests:
• The control and safety devices (gas valve, flow meter, thermostats, etc.) must function correctly.
• The fume extraction circuit must be fully efficient.
• The airtight chamber must be sealed
• The air-fume end piece and ducts must be free of obstructions and leaks
• The condensate evacuation system must be efficient with no leakage or obstructions.
• The burner and exchanger must be clean and free of scale. When cleaning, do not use chemical products or wire
brushes.
• The electrode must be free of scale and properly positioned.
• The gas and water systems must be airtight.
• The water pressure in the cold water system must be about 1 bar; otherwise, bring it to that value.
• The circulation pump must not be blocked.
• The expansion tank must be filled.
• The gas flow and pressure must correspond to that given in the respective tables.
A
The boiler casing, panel and aesthetic parts can be cleaned with a soft damp cloth, possibly soaked in soapy
water. Do not use any abrasive detergents and solvents.
Page 22
ECONCEPT TECH 25 C
22 EN
cod. 3540I371 - 06/2008 (Rev. 00)
Opening the casing
To open the boiler casing (fig. 28):
1. Undo the screws (1)
2. Open, turning the casing (2)
3. Lift and remove the casing (3)
fig. 28 - Opening the casing
Combustion analysis
It is possible to analyse the combustion through the air sampling (detail 2) and fume sampling (detail 1) points shown
in fig. 29.
To take the measurement:
1. Open the air and fume sampling points
2. Insert the probes
3. Press the"+" and "-" buttons for 5 seconds to activate TEST mode
4. Wait 10 minutes for the boiler to stabilise
5. Take the measurement
For natural gas the CO
2
reading must be between 8.7 and 9 %.
For LPG the CO
2
the reading must be between 9.5 and 10 %.
A
Analyses made with an unstabilised boiler can cause measurement errors.
fig. 29 - Combustion analysis
3
1
2
1
eco
comfort
reset
1
2
3
4
0
B
AR
eco
comfort
reset
1
2
3
4
0
B
AR
2
2
1
1
Page 23
ECONCEPT TECH 25 C
23EN
cod. 3540I371 - 06/2008 (Rev. 00)
3.4 Troubleshooting
Diagnostics
In case of operation faults or problems, the display flashes and the fault identification code appears.
There are faults that cause permanent shutdown (marked with the letter “A”): to restore operation just press the RESET
button (detail 8 - fig. 1) for 1 second or RESET on the optional remote timer control if installed; if the boiler fails to start,
it is necessary to first eliminate the fault.
Other faults (marked with the letter “F”) cause temporary shutdowns that are automatically reset as soon as the value
returns within the boiler's normal working range.
Table. 5 - List of faults
Fault
code
Fault Possible cause Cure
A01 The burner fails to light
No gas
Check the regular gas flow to the boiler and that the air
has been eliminated from the pipes
Ignition/detection electrode fault
Check the wiring of the electrode and that it is correctly
positioned and free of any deposits
Faulty gas valve Check the gas valve and replace it necessary
Insufficient gas supply pressure Check the gas supply pressure
Trap clogged Check the trap and clean it if necessary
A02
Flame present signal with
burner off
Electrode fault Check the ionisation electrode wiring
Card fault Check the card
A03
Overtemperature protection
activated
Heating sensor damaged
Check the correct positioning and operation of the
heating sensor
No water circulation in the sys-
tem
Check the circulating pump
Air in the system Vent the system
A04
Fume exhaust duct safety
activated
Fault F07 generated 3 times in
the last 24 hours
See fault F07
A05 Fan protection activated
Fault F15 generated for 1 hour
(consecutive)
See fault F15
A06
No flame after ignition
stage (6 times in 4 minutes)
Ionisation electrode fault Check the position of the ionisation electrode and
replace it if necessary
Flame unstable Check the burner
Gas valve Offset fault Check the Offset adjustment at minimum power
air/fume ducts obstructed
Remove the obstruction from the flue, fume exhaust
ducts and air inlet and terminals
Trap clogged Check the trap and clean it if necessary
F07 High fume temperature
Flue partially obstructed or insufficient
Check the efficiency of the flue, fume exhaust ducts
and outlet terminal
Fume sensor position
Check the correct positioning and operation of the
fume sensor
F10 Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F11 Return sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F12 DHW sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
Page 24
ECONCEPT TECH 25 C
24 EN
cod. 3540I371 - 06/2008 (Rev. 00)
F13 Fume sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F14 Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F15 Fan fault
No 230V power supply Check the wiring of the 3-pole connector
Tachometric signal interrupted Check the wiring of the 5-pole connector
Fan damaged Check the fan
F34 Supply voltage under 170V Power supply trouble Check the electrical system
F35 Mains frequency fault Power supply trouble Check the electrical system
F37
Incorrect system water
pressure
Pressure too low Fill the system
Water pressure switch not con-
nected or damaged
Check the sensor
F39 External probe fault
Probe damaged or wiring
shorted
Check the wiring or replace the sensor
Probe disconnected after activating the sliding temperature
Reconnect the external probe or disable the sliding
temperature
A41 Sensor positioning
Delivery sensor disconnected
from the pipe
Check the correct positioning and operation of the
heating sensor
F42 Heating sensor fault Sensor damaged Replace the sensor
Fault
code
Fault Possible cause Cure
Page 25
ECONCEPT TECH 25 C
25EN
cod. 3540I371 - 06/2008 (Rev. 00)
4. Technical data and characteristics
4.1 Dimensions and connections
fig. 30 - Dimensions and connections
1 = Heating system delivery
2 = Domestic hot water outlet
3 = Gas inlet
4 = Domestic cold water inlet
5 = Heating system return
6 = Safety valve drain
700
400
82.5 76 54
51 80.5
56
179
231
80
80
120 120
195
330
1 3 6 52 4
Page 26
ECONCEPT TECH 25 C
26 EN
cod. 3540I371 - 06/2008 (Rev. 00)
4.2 General view and main components
fig. 31 - General view
5 Sealed chamber
7 Gas inlet
8 Domestic hot water outlet
9 Domestic cold water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
19 Combustion chamber
22 Main burner
29 Fume outlet manifold
32 Heating circulating pump
36 Automatic air vent
37 Cold water inlet filter
39 Flow regulator
42 DHW temperature probe
44 Gas valve
56 Expansion tank
74 System filling cock
82 Detection electrode
95 Diverter valve
114 Water pressure switch
136 Flowmeter
161 Condensing heat exchanger
186 Return sensor
188 Ignition electrode
191 Fume temperature sensor
193 Trap
194 DHW circuit exchanger
196 Condensate tray
250 System delivery filter
278 Double sensor (Safety + Heating)
201
56
22
161
19
196
186
36
114
32
1197448
74
10
95
193
278
82
188
16
5
29 191
250
14
42
39
136
37
194
Page 27
ECONCEPT TECH 25 C
27EN
cod. 3540I371 - 06/2008 (Rev. 00)
4.3 Plumbing circuit
fig. 32 - Plumbing circuit
7 Gas inlet
8 Domestic hot water outlet
9 Domestic cold water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
32 Heating circulating pump
36 Automatic air vent
37 Cold water inlet filter
42 DHW temperature probe
44 Gas valve
56 Expansion tank
74 System filling cock
95 Diverter valve
114 Water pressure switch
136 Flowmeter
154 Condensate outlet pipe
161 Condensing heat exchanger
186 Return sensor
193 Trap
194 DHW circuit exchanger
196 Condensate tray
241 Automatic bypass
250 System delivery filter
278 Double sensor (Safety + Heating)
56
44
14
32
136
37
1110 78
9
95
241
114
36
186
161
278
193
154
16
194
42
250
196
74
Page 28
ECONCEPT TECH 25 C
28 EN
cod. 3540I371 - 06/2008 (Rev. 00)
4.4 Technical data table
The column on the right gives the abbreviation used on the dataplate.
Data Unit Value
Max. heating capacity kW 25.2 (Q)
Min. heating capacity kW 5.3 (Q)
Max. Heat Output in heating (80/60°C) kW 24.6 (P)
Min. Heat Output in heating (80/60°C) kW 5.2 (P)
Max. Heat Output in heating (50/30°C) kW 26.6
Min. Heat Output in heating (50/30°C) kW 5.7
Max. DHW heating capacity kW 27
Min. DHW heating capacity kW 5.3
Max. Heat Output in hot water production kW 26.5
Min. Heat Output in hot water production kW 5.2
Gas supply pressure G20 mbar 20
Max. gas delivery G20
m
3
/h
2.86
Min. gas delivery G20
m
3
/h
0.56
Gas supply pressure G31 mbar 37
Max. gas delivery G31 kg/h 2.11
Min. gas delivery G31 kg/h 0.41
Efficiency class directive 92/42 EEC -
NOx emission class - 5 (NOx)
Max. working pressure in heating bar 3 (PMS)
Min. working pressure in heating bar 0.8
Max. heating temperature °C 95 (tmax)
Heating water content litres 1.5
Heating expansion tank capacity litres 8
Heating expansion tank prefilling pressure bar 1
Max. working pressure in hot water production bar 9 (PMW)
Min. working pressure in hot water production bar 0.25
Hot water content litres 0.3
DHW flowrate Δt 25°C l/min 15.2
DHW flowrate Δt 30°C l/min 12.7 (D)
Protection rating IP X5D
Power supply voltage V/Hz 230V/50Hz
Electrical absorption W 120
Electrical absorption in hot water production W 120
Empty weight kg 37
Type of unit C13-C23-C33-C43-C53-
C63-C83-B23-B33
PIN CE 0063BR3161
Page 29
ECONCEPT TECH 25 C
29EN
cod. 3540I371 - 06/2008 (Rev. 00)
4.5 Diagrams
Loss of head/Head of circulators
A Boiler losses of head
1 - 2 - 3 Circulator speed
0
1
2
3
4
5
6
7
0 500 1.000 1.500 2.000
Q [l/h]
H [m H
2
O]
A
3
2
1
Page 30
ECONCEPT TECH 25 C
30 EN
cod. 3540I371 - 06/2008 (Rev. 00)
4.6 Wiring diagram
fig. 33 - Wiring diagram
A
Caution: Before connecting the room thermostat or the remote timer control, remove the jumper on the
terminal block.
16 Fan
32 Heating circulator
42 Tap water temperature sensor
44 Gas valve
72 Room thermostat
82 Detection electrode
95 Diverter valve
114 Water pressure switch
136 Flow meter
138 External sensor
139 Remote timer control
186 Return sensor
188 Ignition electrode
191 Fume temperature sensor
278 Double sensor (heating + safety)
A Flow meter ON/OFF contact
72
95
42
114
136
191
16
186
188
82
T°T°
278
139
138A
32
16
44
NL
230V
50Hz
GND
OUT
+5V
123456
DBM04A
Page 31
FERROLI S.p.A.
Via Ritonda 78/a
37047 San Bonifacio - Verona - ITALY
www.ferroli.it
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