Ferroli ECONCEPT TECH 35 A Troubleshooting guide

,cod. 3540I341 — 04/2008 (Rev. 00)
ECONCEPT TECH 35A
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
INSTRUCTIONS D'UTILISATION, D'INSTALLATION ET D'ENTRETIEN
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ECONCEPT TECH35A
2EN
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
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.
cod. 3540I341 - 04/2008 (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 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 op-
eration, disconnect the unit from the electrical power
supply using the switch and/or the special cut-off de-
vices.
• 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 hazard-
ous.
• 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.

ECONCEPT TECH 35A
3
,cod. 3540I341 - 04/2008 (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 ....................................................................................................................................13
2.5 Electrical connections...........................................................................................................................14
2.6 Fume ducts...........................................................................................................................................15
2.7 Condensate drain connection...............................................................................................................19
3 Service and maintenance...................................................................................................... 20
3.1 Adjustments..........................................................................................................................................20
3.2 Start-up.................................................................................................................................................21
3.3 Maintenance.........................................................................................................................................22
3.4 Troubleshooting....................................................................................................................................24
4 Technical characteristics and data ...................................................................................... 26
4.1 Dimensions and connections ...............................................................................................................26
4.2 General view and main components .................................................................................................... 27
4.3 Plumbing circuit ....................................................................................................................................28
4.4 Technical data table ............................................................................................................................. 29
4.5 Diagrams .............................................................................................................................................. 30
4.6 Wiring diagram ..................................................................................................................................... 31

ECONCEPT TECH35A
4EN
cod. 3540I341 - 04/2008 (Rev. 00)
1. Operating instructions
1.1 Introduction
Dear Customer,
Thank you for choosing a ECONCEPT TECH 35 A wall-mounted boiler featuring FERROLIadvanced 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 35 A is a high-efficiency condensation pre-mixed heat generator with an an airtight chamber for
heating and hot water production (with optional external water heater) with extremely low emissions, running on natural
gas or LPG and equipped with a microprocessor control system.
The boiler shell consists of an aluminium laminar exchanger and a ceramic pre-mixed burner equipped with electronic
ignition and ionization flame control, modulating speed fan and modulating gas valve.
The boiler is arranged for connection to an external storage tank for hot water production (optional). In this manual
all the functions relevant to domestic hot water production are only active with the optional hot water tank connected as
indicated in sec. 2.3.
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 = Summer/Winter mode selection - Reset button -
"Sliding Temperature" Menu
7 = Unit On/Off - Economy/Comfort mode selection
button
8 = DHW symbol
9 = DHW circuit operation
10 = Summer mode
11 = Multifunction (blinking during the exchanger pro-
tection function)
12 = Eco (Economy) mode
13 = Heating operation
14 = Heating symbol
15 = Burner On and actual power (blinking during the
flame protection function)
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8 9 15
1314
12
11
10
21
43 6
75

ECONCEPT TECH 35A
5EN cod. 3540I341 - 04/2008 (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 mes-
sage “d2”.
fig. 2
Hot water
A DHW demand (generated by drawing domestic hot water) is indicated by flashing of the hot water under the tap (de-
tails 8 and 9 - fig. 1).
The display (detail 11 - fig. 1) shows the actual hot water outlet temperature and, during DHW standby time, the mes-
sage “d1“.
fig. 3
Exclude hot water storage tank (economy)
Hot water storage tank temperature maintaining/heating can be excluded by the user. If excluded, domestic hot water
will not be delivered.
The hot water tank can be deactivated by the user (ECO mode) by pressing the ECO/COMFORT button (detail 7 -
fig. 1). In ECO mode the display activates the ECO symbol (detail 12 - fig. 1). To activate COMFORT mode, press the
ECO/COMFORT button (detail 7 - fig. 1) again.
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ECONCEPT TECH35A
6EN
cod. 3540I341 - 04/2008 (Rev. 00)
1.3 Turning on and off
Boiler lighting
Switch on the power to the unit.
fig. 4 - 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. 5 - 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. 6
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 35A
7EN cod. 3540I341 - 04/2008 (Rev. 00)
BThe 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. 7
The display activates the Summer symbol (detail 10 - fig. 1): the boiler will only deliver domestic hot water. The anti-
freeze 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. 8
Hot water temperature adjustment
Operate the DHW buttons (detail 1 and 2 - fig. 1) to adjust the temperature from a min. of 10°C to a max. of
65°C.
fig. 9
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ECONCEPT TECH35A
8EN
cod. 3540I341 - 04/2008 (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 ac-
cording to the required room temperature. For information on the remote timer control, please refer to its user's manual.
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 heat-
ing 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. 10).
Operate the DHW buttons (details 1 and 2 - fig. 1) to adjust the required curve from 1 to 10 according to the
characteristic (fig. 12). By setting the curve to 0, sliding temperature adjustment is disabled.
fig. 10 - Compensation curve
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ECONCEPT TECH 35A
9EN cod. 3540I341 - 04/2008 (Rev. 00)
Press the heating buttons (details 3 and 4 - fig. 1) to access parallel curve offset; "OF" appears flashing
(fig. 11). Operate the DHW buttons (details 1 and 2 - fig. 1) to adjust parallel curve offset according to the
characteristic (fig. 13).
fig. 11 - 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. 12 - Compensation curves
fig. 13 - Example of parallel compensation curve shift
AIf the Remote Timer Control (optional) is connected to the boiler, the above adjustments are managed accord-
ing 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

ECONCEPT TECH35A
10 EN
cod. 3540I341 - 04/2008 (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. 14).
fig. 14 - Low system pressure fault
Operate the filling cock (detail 1 - fig. 15) and bring the system pressure to a value above 1.0 bar.
fig. 15 - Filling cock
AOnce 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. 15)
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 35A
11EN cod. 3540I341 - 04/2008 (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 PRE-
SCRIPTIONS OF NATIONAL STANDARDS AND LOCAL REGULATIONS AND THE RULES OF PROPER WORK-
MANSHIP
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.
AIf 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 ad-
visable to install shut-off valves between the boiler and heating system allowing the boiler to be isolated from the system
if necessary.
BThe 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. If this is not done, and the drain valve trips and floods the room,
the boiler manufacturer is not to be held responsible.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully flush all the pipes of the system to remove residues or impurities that could impair the op-
eration of the unit.
BIn addition, a filter must be installed on the system return piping to prevent debris or sludge from the system
clogging and damaging the heat generators.
The filter MUST be installed when replacing generators in existing systems. The manufacturer shall not be
held liable for any damage caused to the generator by failure to install or inadequate installation of this filter.
Make the connections to the corresponding connections as shown on the drawing in sec. 4.1 and by the symbols on the
unit.

ECONCEPT TECH35A
12 EN
cod. 3540I341 - 04/2008 (Rev. 00)
On request, it is possible to supply the connecting kits shown in the figure below.
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 be-
comes necessary in these cases, it is advisable to refill it with treated water.
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 com-
ponents and/or materials of the boiler unit and system. It is prohibited to use generic antifreeze fluid, additives or inhib-
itors that are not expressly suited for use in heating systems and compatible with the materials of the boiler unit and
system.
A - Female sleeve
B - OT 58 nipple
C - O-ring
D - OT 58 clamping ring
E - Copper washer
F - OT 58 fitting
G - Ball cock
fig. 16 - Connection kits
AF
C D E
FEDB CA
G

ECONCEPT TECH 35A
13EN cod. 3540I341 - 04/2008 (Rev. 00)
Connection to a storage tank for domestic hot water production
The unit's electronic board is arranged for managing an external storage tank for domestic hot water production. Make
the plumbing connections according to the diagram of fig. 17. Make the electrical connections as shown on the wiring
diagram in sec. 4.6. It is necessary to use the kit code 1KWMA11W. At the next lighting, the boiler's control system rec-
ognises the presence of the hot water tank probe and automatically configures the DHW function, activating the display
and relevant controls.
fig. 17 - Diagram of connection to external hot water tank
8Sanitary hot water outlet
9Tap water inlet
10 System delivery
11 System return
209 Boiler delivery
210 Boiler return
2.4 Gas connection
BBefore 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. 31) 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.
BDo not use the gas pipes to earth electrical appliances.
8
9
1110
210
209

ECONCEPT TECH35A
14 EN
cod. 3540I341 - 04/2008 (Rev. 00)
2.5 Electrical connections
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 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.
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.
Room thermostat (optional)
BCAUTION: 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 bat-
teries, depending on the kind of device.
External probe (optional)
Connect the probe to its respective terminals. The maximum permissible length for the boiler - external probe connec-
tion 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. 18 - External probe positioning not recommended

ECONCEPT TECH 35A
15EN cod. 3540I341 - 04/2008 (Rev. 00)
Access to the electrical terminal board
Follow the instructions given in fig. 19 to access the electrical connection terminal board. The layout of the terminals for
the various connections is given in the wiring diagram in fig. 34.
fig. 19 - Access to the electrical terminal board
2.6 Fume ducts
The unit is “type C” with an airtight chamber and forced draught, the air inlet and fume outlet must be connected to one
of the following extraction/suction systems. The unit is type-approved to work with all the Cxy flue configurations stated
on the technical data plate (some setups are given by way of example in this chapter). It is however possible that some
setups are expressly limited or not permitted by law, standards or local regulations. Before proceeding with installation,
check and meticulously observe the above-mentioned prescriptions. In addition, comply with the provisions concerning
the positioning of wall and/or roof end pieces and the minimum distances from windows, walls, ventilation openings, etc.
BThis C-type unit must be installed using the fume extraction and outlet ducts supplied by the manufacturer in
accordance with UNI-CIG 7129/92. Failure to use them automatically forfeits all warranty and liability of the
manufacturer.
AFor fume exhaust pipes longer than 1 metre, during installation take in 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. 20 - Expansion
2 ÷ 4 mm

ECONCEPT TECH35A
16 EN
cod. 3540I341 - 04/2008 (Rev. 00)
Connection with coaxial pipes
fig. 21 - 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 pos-
sible condensate from flowing back towards the outside and causing dripping.
fig. 22 - 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

ECONCEPT TECH 35A
17EN cod. 3540I341 - 04/2008 (Rev. 00)
Connection with separate pipes
fig. 23 - Examples of connection with separate pipes ( = Air / = Fumes)
For connection of the separate ducts, fit the unit with the following starting accessory:
fig. 24 - 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 4 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 3.
Table. 3 - Max. length separate ducts
Separate ducts
Max. permissible length 55 meq
C 53
C
33 C 53 B 23 C 13
041003X0

ECONCEPT TECH35A
18 EN
cod. 3540I341 - 04/2008 (Rev. 00)
Table. 4 - Accessories
Connection to collective flues
fig. 25 - Examples of connection to flues ( = Air / = Fumes)
If you are then going to connect the ECONCEPT TECH 35 A 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 cur-
rent 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 air-
tight closure.
Losses in meq
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
C83 C43
C43

ECONCEPT TECH 35A
19EN cod. 3540I341 - 04/2008 (Rev. 00)
2.7 Condensate drain connection
The boiler is equipped with a trap to drain condensate. Fit the inspection connection Aand 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. 26 - Condensate drain connection

ECONCEPT TECH35A
20 EN
cod. 3540I341 - 04/2008 (Rev. 00)
3. Service and maintenance
All adjustment, conversion, start-up and maintenance operations described below must only be carried out by Qualified Per-
sonnel (meeting the professional technical requirements prescribed by current regulations) such as those of the Local After-
Sales 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 Cand remove the gas pipeAfrom the fan - venturi assembly.
4. Replace the nozzle Binserted in the gas pipe with that contained in the conversion kit.
5. Reassemble the gas pipe Awith 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 corre-
sponding gas type.
fig. 27 - Gas supply conversion