Ferroli DOMIcondens HE 26 C Troubleshooting guide

3540Z850
cod. 3540Z850 — 12/2010 (Rev. 00)
DOMIcondens HE 26 C
700
400
196
85 115 200
330
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE

2EN
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”.
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.
EN
cod. 3540Z850 - 12/2010 (Rev. 00)

DOMIcondens HE 26 C
3
EN
cod. 3540Z850 - 12/2010 (Rev. 00)
EN
1. GENERAL INSTRUCTIONS
• Carefully read the instructions contained in this instruction booklet.
• After boiler installation, inform the user regarding its operation and give him this manual, which is an integral
and essential part of the product and must be kept with care for future reference.
• Installation and maintenance must be carried out by professionally qualified personnel, according to current
regulations and the manufacturer's instructions. Do not carry out any operation on the sealed control parts.
• Incorrect installation or inadequate maintenance can result in damage or injury. The Manufacturer declines
any liability for damage due to errors in installation and use or failure to follow the instructions.
• Before carrying out any cleaning or maintenance operation, disconnect the unit from the power supply using
the system switch and/or the special cut-off devices.
• In case of a fault and/or poor operation, deactivate the unit and do not attempt to repair it or directly intervene.
Contact professionally qualified personnel. Repair/replacement of the products must only be carried out by
professionally qualified using original spare parts. Failure to comply with the above could affect the safety of
the unit.
• This unit must only be used for its intended purpose. Any other use is considered improper and therefore
dangerous.
• The packing materials are potentially hazardous and must not be left within the reach of children.
• The images given in this manual are a simplified representation of the product. In this representation there
may be slight and insignificant differences with respect to the product supplied.
2. OPERATING INSTRUCTIONS
2.1 Introduction
Dear Customer,
DOMIcondens HE 26 C is a high-efficiency sealed chamber condensing heat genera-
tor for heating and hot water production running on natural gas or LPG, and equipped
with a microprocessor control system.
2.2 Control panel
Panel
fig. 1 - Control panel
Panel key fig. 1
1DHW temperature setting decrease button
2DHW temperature setting increase button
3Heating system temperature setting decrease button
4Heating system temperature setting increase button
5Display
6"Sliding Temperature" Menu - Summer/Winter mode selection - Reset button
7Unit On/Off - Economy/Comfort mode selection button
8DHW symbol
9DHW mode
10 Summer mode
11 Multifunction
12 Eco (Economy) mode
13 Heating
14 Heating symbol
15 Burner lit and actual power level (flashing during combustion fault function)
16 Service Tool connection
17 Arrangement for clock
Indication during operation
Heating
A heating demand (generated by the Room Thermostat or Remote Timer Control) is in-
dicated by flashing of the hot air above the radiator on the display.
The display (detail 11 - fig. 1) shows the actual heating delivery temperature and, during
heating standby time, the message “d2”.
Domestic hot water (DHW)
A DHW demand (generated by drawing domestic hot water) is indicated by flashing of
the hot water under the tap on the display.
The display (detail 11 - fig. 1) shows the actual DHW outlet temperature and, during
DHW standby time, the message “d1“.
Comfort
A Comfort demand (reinstatement of temperature inside the boiler) is indicated by flash-
ing of the water under the tap on the display. The display (detail 11 - fig. 1) shows the
actual temperature of the water in the boiler.
Fault
In case of a fault (see cap. 4.4) the display (detail 11 - fig. 1) shows the fault code and,
during safety standby times, the messages “d3” and “d4”.
2.3 Lighting and turning off
Connection to the power supply
• During the first 5 seconds the display will also show the card software release.
• Open the gas cock ahead of the boiler.
• The boiler is now ready to function automatically whenever domestic hot water is drawn or in
case of a heating demand (generated by Room Thermostat or Remote Temperature Control).
Turning the boiler off and on
Press the on/off button (detail 7 - fig. 1 ) for 5 seconds.
fig. 2 - Turning the boiler off
When the boiler is turned off, the PCB is still powered. Domestic hot water and heating are disa-
bled. The antifreeze system remains activated. To relight the boiler, press the
on/off button (detail
7
fig. 1 ) again for 5 seconds.
fig. 3
The boiler will be immediately ready to work whenever domestic hot water is drawn or in case of a
heating demand (generated by the Room Thermostat or the Remote Timer control).
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. 3.3 .
2.4 Adjustments
Summer/Winter Switchover
Press the summer/winter button (detail 6 - fig. 1) for 2 seconds.
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 the Summer mode, press the summer/winter button (detail 6 - fig. 1)
again for 2 seconds.
Heating temperature setting
Use the heating buttons (details 3 and 4 - fig. 1) to adjust the temperature from a min. of
30°C to a max. of 85°C; it is advisable not to operate the boiler below 45°C.
fig. 4
DHW temperature adjustment
Use the DHW buttons (details 1 and 2 - fig. 1) to adjust the temperature from a min. of
40°C to a max. of 50°C.
fig. 5
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature required in the rooms. If the room ther-
mostat is not installed, the boiler will keep the system at the set system delivery setpoint
temperature.
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the required temperature in the rooms. The boiler will
adjust the system water according to the required room temperature. For operation with
remote timer control, please refer to the relevant instruction manual.
ECO/COMFORT selection
The unit has a function that ensures a high domestic hot water delivery speed and max-
imum comfort for the user. When the device is activated (COMFORT mode), the water
contained in the boiler is kept hot, thereby ensuring immediate availability of hot water
on opening the tap, without waiting times.
The user can deactivate the device (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 the COMFORT mode, press the eco/comfort button (detail 7 - fig. 1) again.
eco
comfort
reset
915
13
12
11
8
1
36
7102
16414
5
17
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3540Z850

DOMIcondens HE 26 C
4EN cod. 3540Z850 - 12/2010 (Rev. 00)
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 controlled
according to the outside weather conditions, to ensure high comfort and energy saving
throughout the year. In particular, the system delivery temperature is decreased as the
outside temperature increases, according to a specific "compensation curve”.
With Sliding Temperature adjustment, the temperature set with the heating buttons (de-
tail 3 - 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 reset button (detail 6 - fig. 1) for 5 seconds to access the "Sliding temperature"
menu; the display shows "CU" flashing.
Use the DHW buttons (detail 1 - fig. 1) to adjust the curve from 1 to 10 according to the
characteristic. By setting the curve to 0, sliding temperature adjustment is disabled.
Press the heating buttons (detail 3 - fig. 1) to access parallel curve offset; the display
shows "OF" flashing. Use the DHW buttons (detail 1 - fig. 1) to adjust the parallel curve
offset according to the characteristic (fig. 6).
Press the reset button (detail 6 - fig. 1) again for 5 seconds to exit the "Sliding Temper-
ature" menu.
If the room temperature is lower than the required value, it is advisable to set a higher
order curve and vice versa. Proceed by increasing or decreasing in steps of one and
check the result in the room.
fig. 6 - Example of compensation parallel curve offset
Adjustments from Remote Timer Control
AIf the Remote Timer Control (optional) is connected to the boiler, the above ad-
justments are managed according to that given in table 1.
Table. 1
Water system pressure regulation
The filling pressure read on the boiler water gauge with the system cold must be approx
1.0 bar. If the system pressure falls to values below minimum, the boiler stops and fault
F37 is displayed.
3. INSTALLATION
3.1 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, compatible with
its performance, characteristics and its heating capacity. Any other use is
deemed improper.
BOILER INSTALLATION MUST ONLY BE CARRIED OUT BY QUALIFIED PERSON-
NEL, IN ACCORDANCE WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL
MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRESCRIPTIONS OF THE
TECHNICAL STANDARDS (BS), ANY LOCAL REGULATIONS AND THE RULES OF
PROPER WORKMANSHIP.
Incorrect installation can cause damage or injury for which the manufacturer declines
any responsibility.
Installation of this unit must be carried out in strict compliance with the present
instructions and the following regulations 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
For Northern Ireland, observe the current applicable regulations.
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 concen-
trated in order to establish the centre of gravity and suitably reposition yourself.
3.2 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 dangerous conditions in case of even small gas
leaks. This safety standard is required by the EEC Directive no. 90/396 for all gas units,
including those with sealed chamber
The unit is suitable for operation in a partially protected place in compliance with EN 297
pr A6, for temperatures to -5°C. It is advisable to install the boiler under the slope of a
roof, inside a balcony or in a sheltered recess.
Therefore 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 hooking bracket. Fix
the bracket to the wall according to the measurements given in the cover drawing and
hook the boiler on it. A metal template for marking the drilling points on the wall is avail-
able by request. The wall fixing must ensure stable and effective support for the gener-
ator.
AIf the unit is enclosed in a cabinet or mounted alongside, a space must be pro-
vided for removing the casing and for normal maintenance operations
Heating temperature setting Adjustment can be made from the Remote Timer Control menu and the
boiler control panel.
Hot water temperature adjustment Adjustment can be made from the Remote Timer Control menu and the
boiler control panel.
Summer/Winter Switchover Summer mode has priority over a possible Remote Timer Control heat-
ing demand.
Eco/Comfort selection Adjustment can only be made from the boiler control panel.
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
B.S. 5440 Detail 1 Flues
B.S. 5440 Detail 2 Air supply and ventilation
B.S. 5449 ......... Systems for hot water production with forced circulation
B.S. 6798 ......... Installation of gas-fired boilers for hot water
B.S. 6891 ......... Gas systems
B.S. 7671 ......... IEE wiring system regulations
B.S. 4814 ......... Specifications for expansion tanks
B.S. 5482 ......... LPG systems
B.S. 7593 ......... Water treatment in central heating systems for domestic hot water production
B.S. 5546 ......... Installation of systems for domestic hot water production
B.S. 5955-8 ......... Installation of plastic pipes

DOMIcondens HE 26 C
5
EN
cod. 3540Z850 - 12/2010 (Rev. 00)
3.3 Plumbing connections
Important
The heating capacity of the unit 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 thermostattable valve (TRV) etc. The system delivery 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 can form in certain places,
it is advisable to install vent valves at these points. Also, type "A" drain cocks must be installed at
the lowest points in the system to allow complete emptying.
B
An automatic bypass with flow rate of at least 6 l/min. must be installed (connected as
far away as possible from the boiler) if radiators with thermostatic valves have been con-
nected.
fig. 7 - Automatic bypass connection
The temperature drop between the delivery manifold and the return to the boiler should not exceed
20°C.
B
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the heating system 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. 8 .
fig. 8 - Plumbing connections
Shutoff valve kit
Make sure to install the shutoff valves (supplied) between the boiler and the heating system, allow-
ing the boiler to be isolated from the system if necessary.
B
The safety valve outlet must be connected to a copper pipe of 15 mm diameter with con-
tinuous fall from the boiler to run off the system water in case of overpressure in the heat-
ing circuit. Otherwise, if the discharge valve cuts in and floods the room, the boiler
manufacturer cannot be held liable. The drain must be run to the outside of the building
to avoid the risk of damage or injury due to the hot water in case of overpressure in the
system.
Make the boiler connection in such a way that its internal pipes 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 the circuit (with the non-return valve at least 3 m from the boiler) or an ex-
pansion tank for domestic use.
For installation, follow the instructions contained in the kit.
Replenishing water
It is necessary to provide for replenishing of the water lost by the sealed system. Refer
to standard BS6798 for the methods of filling and replenishing water in sealed systems.
There must not be a direct connection between the central heating system of the boiler
and the water mains. For the use of water coming from the water mains and direct pres-
surisation of the system, refer to the local water management by-laws. This connection
must be interrupted after use.
The boiler comes standard with the connection (filling loop) shown in fig. 9. For installa-
tion, follow the instructions given on the instruction sheet enclosed with the kit
To replenish the water in the system:
• Fix the removable connection “1” between the two valves.
• Open the two cocks “2 and 3” until the pressure read on the water gauge is approx.
1 bar.
• Close the two cocks “2 and 3”.
• At the end of the operation, remove the removable connection “1”.
Reference is made to the provisions contained in the water management by-laws.
fig. 9 - Filling loop
Water treatment
If water treatment is necessary, Ferroli recommends the exclusive use of specific prod-
ucts such as Fernox or Sentinel to be applied according to the producer's instructions.
For further information, please contact:
AIf the boiler is installed in an existing system, any unsuitable additives must be
removed by thoroughly cleaning the system. Cleaning of all the systems must
be done in compliance with the requirements of standard B.S. 7593.
AIn areas with hard water, treatment may be necessary in order to prevent scale
from forming in the boiler.
AMake sure to use the water treatment product in the right concentration, accord-
ing to the producer's instructions.
3.4 Gas connection
The gas must be connected to the relevant union (see figure on cover) in conformity with
the current regulations, with a rigid metal pipe or with a continuous surface flexible s/steel
tube, installing a gas cock between the system and boiler. Make sure all the gas connec-
tions are tight.
3.5 Electrical connections
Important
BThe unit must be connected to an efficient earthing system in conformity with
current safety regulations. Have the efficiency and suitability of the earthing
system checked by professionally qualified personnel; the Manufacturer de-
clines any liability for damage caused by failure to earth the system.
The boiler is prewired and provided with a "Y" type cable (without plug) for con-
nection to the electric line. The connections to the power supply must be per-
manent and equipped with a double-pole switch with contact opening distance
of at least 3 mm, installing fuses of max. 3A between the boiler and the line.
Make sure to respect the polarities (LINE: brown wire / NEUTRAL: blue wire /
EARTH: yellow/green wire) in connections to the electric line.
BThe unit's power cable must not be replaced by the user; if damaged, switch
the unit off and have the cable replaced by professionally qualified personnel.
If replacing the power cable, only use "HAR H05 VV-F" 3x0.75 mm2 cable with
max. ext. diameter of 8 mm.
Room thermostat (optional)
BIMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE
CONTACTS. CONNECTING 230 V TO THE ROOM THERMOSTAT TERMI-
NALS WILL PERMANENTLY DAMAGE THE ELECTRONIC BOARD.
When connecting time controls or a timer, do not take the power supply for
these devices from their breaking contacts Their power supply must be by
means of direct connection from the mains or with batteries, depending on the
kind of device.
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Cold water mains
39 60 60 86 95 60
204
158
1 3
6
52 4
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]

DOMIcondens HE 26 C
6EN cod. 3540Z850 - 12/2010 (Rev. 00)
Accessing the electrical terminal block
Follow the instructions given in fig. 10 to access the electrical connections terminal block.
The layout of the terminals for the various connections is also given in the wiring diagram
in fig. 28.
fig. 10 - Accessing the terminal block
3.6 Fume ducts
Important
The unit is “type C” with sealed chamber and forced draught; the air inlet and fume outlet
must be connected to one of the following extraction/suction systems. Before installation,
check and carefully observe the above prescriptions. Also, comply with the provisions
concerning the positioning of wall and/or roof terminals and the minimum distances from
windows, walls, vents, etc.
Expansion
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 any deformation, leave an expansion space of approx. 2 ÷ 4 mm for
every metre of pipe.
Baffles
Boiler operation requires fitting the baffles supplied with the unit, according to that given
in the following tables.
Before inserting the fume exhaust pipe, check the presence of the right baffle (when it is
to be used) and that it is correctly positioned. The boilers are fitted standard with the
smallest diameter baffle. To replace the baffle (ref. 1 - fig. 11), proceed as indicated in
fig. 11.
fig. 11
Connection with coaxial pipes
Standard coaxial installation
fig. 12 - Standard coaxial installation
Other coaxial connections
fig. 13 - Examples of connection with separate pipes ( = Air / = Fumes)
Table. 2 - Typology
For coaxial connection, fit the unit with one of the following starting accessories. For the
wall hole dimensions, refer to the figure on the cover. Any horizontal sections of the fume
exhaust must be kept sloping slightly towards the outside, to prevent condensate from
flowing back towards the unit.
fig. 14 - Starting accessory for coaxial ducts
139
72
56
138
34
3456
1
Type Description
C1X
Wall horizontal exhaust and intake. The inlet/outlet terminals must be concentric or close enough to be
undergo similar wind conditions (within 50 cm)
C3X Roof vertical exhaust and intake. Inlet/outlet terminals like for C12
C5X Wall or roof exhaust and intake separate or in any case in areas with different pressures. The exhaust
and intake must not be positioned on opposite walls.
C6X Intake and exhaust with separately certified pipes (EN 1856/1)
B2X Intake from installation room and wall or roof exhaust
IMPORTANT - THE ROOM MUST BE PROVIDED WITH APPROPRIATE VENTILATION
125
200 200
80
400
700
Ø100
125
196
80
330
700
Ø100
Drill the wall 10÷20 mm
more than the
pipe diameter
Rear outlet
Side view
Side outlet
Front view
Between
10 e 60 mm
Between
10 e 60 mm
041025G0
C5x
C
3x
B2x C1x
max 50 cm
041001X0
041002X0 041006X0
Ø 102
Ø 61.5
Ø 127
Ø 80.5
120 120
90.5
68.5
Ø 100.5
Ø 61.6

DOMIcondens HE 26 C
7
EN
cod. 3540Z850 - 12/2010 (Rev. 00)
Table. 3 - Baffles for coaxial ducts
Connection with separate pipes
fig. 15 - Examples of connection with separate pipes ( = Air / = Fumes)
Table. 4 - Typology
For connection of the separate ducts, fit the unit with the following starting accessory:
fig. 16 - Starting accessory for separate ducts
Before installation, check the baffle to be used and 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 6 and identify the losses in meq (equivalent metres) of every com-
ponent, according to the installation position.
3. Check that the sum total of losses is less than or equal to the maximum permissible
length in table 5.
Table. 5 - Baffles for separate ducts
Table. 6 - Accessories
Position of terminals
fig. 17
Connection to multiple flues or single flues with natural draught
To connect the DOMIcondens HE 26 C boiler to a multiple flue or a single flue with nat-
ural draught, the flue or chimney must be expressly designed by professionally qualified
technical personnel in conformity with the current standards and regulations.
Coaxial 60/100 Coaxial 80/125
Max. permissible length 6 m 12 m
Reduction factor 90° bend 1 m 0.5 m
Reduction factor 45° bend 0.5 m 0.25 m
Baffle to use
0 ÷ 2 m Ø 45 0 ÷ 6 m Ø 45
2 ÷ 4 m Ø 50 6 ÷ 12 m no baffle
4 ÷ 6 m no baffle
Type Description
C1X
Wall horizontal exhaust and intake. The inlet/outlet terminals must be concentric or close enough to be
undergo similar wind conditions (within 50 cm)
C3X Roof vertical exhaust and intake. Inlet/outlet terminals like for C12
C5X Wall or roof exhaust and intake separate or in any case in areas with different pressures. The exhaust
and intake must not be positioned on opposite walls.
C6X Intake and exhaust with separately certified pipes (EN 1856/1)
B2X Intake from installation room and wall or roof exhaust
IMPORTANT - THE ROOM MUST BE PROVIDED WITH APPROPRIATE VENTILATION
Separate ducts
Max. permissible length
55 m
eq
Baffle to use
0 ÷ 15 m
eq
Ø 45
15 ÷ 35 m
eq
Ø 50
35 ÷ 55 m
eq
No baffle
C5x
C
3x
B2x C1x
max 50 cm
Ø 81Ø 81
Ø 65
Ø 87
Ø 65
041039X0
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 010027X0 - 12.0
Fume outlet only Ø80 010026X0 +
1KWMA86U
-4.0
Ø 60
PIPE
1 m M/F 1KWMA89W 6.0
BEND 90° M/F 1KWMA88W 4.5
REDUCTION 80/60 041050X0 5.0
TERMINAL fumes, wall with antiwind 1KWMA90A 7.0
ATTENTION: CONSIDER THE HIGH PRESSURE LOSSES OF Ø60 ACCESSORIES;
USE THEM ONLY IF NECESSARY AND AT THE LAST FUME EXHAUST SECTION.
Minimum dimensions of fume exhaust terminals
A
Directly under an opening, air inlet, openable window, etc. 300 mm
B Above an opening, air inlet, openable window, etc. 300 mm
C Horizontally to an opening, air inlet, openable window, etc. 300 mm
D Under gutters, drain pipes 75 mm
E Under cornices or under eaves 200 mm
F Under balconies or garages 200 mm
G From a drain pipe or a vertical drain pipe 150 mm
H From an internal or external corner 100 mm
I Above ground level, a roof or balcony 300 mm
J From a surface facing the terminal 600 mm
K From a terminal facing the terminal 1200 mm
litres From a garage opening (e.g. door, window) with access to the home 1200 mm
M Vertically from a terminal on the same wall 1500 mm
No Horizontally from a terminal on the same wall 300 mm
O From the wall on which the terminal is fitted N/A
P From a vertical structure on the roof 150 mm
Q Above 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 building 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
F
L
J
HH
K
N
N
MM
Q

DOMIcondens HE 26 C
8EN cod. 3540Z850 - 12/2010 (Rev. 00)
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 progression 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 com-
pensation 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.
3.7 Condensate drain connection
The boiler has an internal trap for draining the condensate. Fit the inspection union Aand
the flexible tube B, pressing it in for about 3 cm. Fill the trap with approx. 0.5 L of water
and connect the flexible tube to the drainage system.
fig. 18 - Condensate drain connection
4. SERVICE AND MAINTENANCE
4.1 Adjustments
Gas 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 gas dif-
ferent from that for which the unit is arranged has to be used, the special conversion kit
will be required, proceeding as follows:
1. Replace the nozzles at the main burner, fitting the nozzles specified in the technical
data table in cap. 5, according to the type of gas used
2. 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“ blinking.
• Press the DHW buttons fig. 1 (details 1 and 2 - ) to set parameter 00 (for nat-
ural gas operation) or 01 (for LPG operation).
• press the DHW buttons details 1 and 2 - fig. 1 for 10 seconds.
• the boiler will return to standby mode
3. Adjust the minimum and maximum pressures at the burner (ref. relevant para-
graph), setting the values given in the technical data table for the type of gas used
4. Apply the sticker contained in the conversion kit, near the dataplate as proof of the
conversion.
TEST mode activation
Press the heating buttons (details 3 and 4 - fig. 1) together for 5 seconds to activate the
TEST mode. The boiler lights at the maximum heating power set as described in the fol-
lowing section.
The heating and DHW symbols (fig. 19) flash on the display; the heating power will be
displayed alongside.
fig. 19 - TEST mode (heating power = 100%)
Press the heating buttons (details 3 and 4 - fig. 1) to increase or decrease the power
(min.=0%, max.=100%).
Press the DHW button "-" (detail 1 - fig. 1) and boiler power is immediately adjusted to
min. (0%). Press the DHW button "+" (detail 2 - fig. 1) and boiler power is immediately
adjusted to max. (100%).
If the TEST mode is activated and enough hot water is drawn to activate the DHW mode,
the boiler remains in TEST mode but the 3-way valve goes to DHW.
To deactivate the TEST mode, press the heating buttons (details 3 and 4 - fig. 1) for 5
seconds.
The TEST mode is automatically disabled in any case after 15 minutes or on stopping of
hot water drawing (if enough hot water is drawn to activate the DHW mode).
Pressure adjustment at the burner
Since this unit has flame modulation, there are two fixed pressure settings: minimum and
maximum, which must be those given in the technical data table according to the type of
gas.
• Connect a suitable pressure gauge to the pressure point "B" downstream of the
gas valve.
• Activate the TEST mode (see cap. 4.1).
• Press the Eco/Comfort button for 2 seconds to access the gas valve Calibration
mode.
• The card goes to the setting “q02”; displaying the actually saved value, by pressing
the DHW buttons .
• If the pressure gauge reading is different from the nominal maximum pressure, pro-
ceed by increases/decreases of 1 or 2 units of parameter “q02” by pressing the
DHW buttons : the value is stored after each modification; wait 10 seconds for the
pressure to stabilise.
• Press the heating button “-” (ref. 3 - fig. 1).
• The card goes to the setting “q01”; displaying the actually saved value, by pressing
the DHW buttons .
• If the pressure gauge reading is different from the nominal minimum pressure, pro-
ceed by increases/decreases of 1 or 2 units of parameter “q01” by pressing the
DHW buttons : the value is stored after each modification; wait 10 seconds for the
pressure to stabilise.
• Recheck both adjustments by pressing the heating buttons and adjust them if nec-
essary by repeating the above procedure.
• Press the Eco/Comfort button for 2 seconds to return to the TEST mode.
• Deactivate the TEST mode (see cap. 4.1).
• Disconnect the pressure gauge.
0.5 l
A
B
3 cm
fig. 20 - Gas valve
A - Upstream pressure point
B - Downstream pressure point
I - Gas valve electrical connection
R - Gas outlet
S - Gas inlet
fig. 21 - Gas valve connection
TYPE SGV100
Pi max 65 mbar
24 Vdc - class B+A
eco
comfort
reset
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
R
B
I
A
S
~ 65Ω
~ 24Ω

DOMIcondens HE 26 C
9
EN
cod. 3540Z850 - 12/2010 (Rev. 00)
Heating power adjustment
To adjust the heating power, switch the boiler to TEST mode (see sec. 4.1). Press the
heating buttons detail 3 - fig. 1 to increase or decrease the power (min. = 00 - max. =
100). Press the reset button within 5 seconds and the max. power will remain that just
set. Exit TEST mode (see sec. 4.1).
4.2 Startup
Before lighting the boiler
• Check the seal of the gas system.
• Check correct prefilling of the expansion tank.
• Fill the water system and make sure all air contained in the boiler and the system
has been vented.
• Make sure there are no water leaks in the system, DHW circuits, connections or boil-
er.
• Check correct connection of the electrical system and efficiency of the earthing sys-
tem.
• Make sure the gas pressure for heating is that required.
• Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler
Checks during operation
• Switch the unit on.
• Check the tightness of the fuel circuit and water systems.
• Check the efficiency of the flue and air/fume ducts while the boiler is working.
• 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 stages.
• Check correct boiler lighting by performing various tests, turning it on and off with
the room thermostat or remote control.
• Make sure the fuel consumption indicated on the meter matches that given in the
technical data table in cap. 5.
• Make sure that with no demand for heating, the burner lights correctly on opening a
hot water tap. Check that in heating mode, on opening a hot water tap, the heating
circulating pump stops and there is regular production of hot water.
• Make sure the parameters are programmed correctly and carry out any required
customisation (compensation curve, power, temperatures, etc.).
4.3 Maintenance
Periodical check
To ensure correct operation of the unit over time, have qualified personnel carry out a
yearly check, providing for the following:
• The control and safety devices (gas valve, flow meter, thermostats, etc.) must func-
tion correctly.
• The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. -The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
• The air-fume end piece and ducts must be free of obstructions and leaks
• The burner and exchanger must be clean and free of deposits. For possible cleaning
do not use chemical products or wire brushes.
• The electrode must be properly positioned and free of scale.
fig. 22 - Electrode positioning
• 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 circulating 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.
4.4 Troubleshooting
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault,
the display will flash together with the fault symbol (detail 11 - fig. 1) indicating the fault
code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation, press the RESET button (detail 6 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to start, it is necessary to eliminate
the fault.
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.
List of faults
Table. 7
3
±
0,5
= =
Fault
code Fault Possible cause Cure
A01
No burner ignition
Excessive condensate level Empty / clean the trap
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 if nec-
essary
Gas valve wiring disconnected Check the wiring
Ignition power too low Adjust the ignition power
A02
Flame present signal with
burner off
Electrode fault Check the ionisation electrode wiring
Card fault Check the card
A03
Overtemperature protection
activation
Heating sensor damaged Check the correct positioning and opera-
tion of the heating sensor
No water circulation in the system Check the circulating pump
Air in the system Vent the system
F04 Fume thermostat fault
Exchangers dirty (clogged on water
side) Clean the exchangers
Faulty water circulation
Fume thermostat contact open Check the thermostat
Wiring disconnected Check the wiring
F05
Fume pressure switch fault
(contact fails to close) Wrong card parameter setting Check the card parameter and modify it if necessary
Fan fault
Wiring disconnected Check the wiring
Faulty fan Check the fan
Card fault Check the card
A06
No flame after the ignition
phase
Low pressure in the gas system Check the gas pressure
Burner minimum pressure setting Check the pressures
F07 Card parameter fault Wrong card parameter setting Check the card parameter and modify it if
necessary
A09 Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve Check the gas valve and replace it if nec-
essary
F10 Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F11 DHW 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
A16 Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve Check the gas valve and replace it if nec-
essary
F20 Combustion control fault
Fan fault Check the fan and fan wiring
Wrong baffle Check the baffle and replace it if neces-
sary
Flue not correctly sized or obstructed Check the flue
A21 Poor combustion fault Fault F20 generated 6 times in the
last 10 minutes See fault F20
A23
Set nominal system water
pressure not reached within 4
minutes
Wrong card parameter setting Check the card parameter and modify it if
necessary
A24 4 fillings within 24 hours Wrong card parameter setting Check the card parameter and modify it if
necessary
F34 Supply voltage under 180V. Electric mains trouble Check the electrical system
F35 Faulty mains frequency Electric mains trouble Check the electrical system
F37
Incorrect system water pres-
sure
Pressure too low Fill the system
Water pressure switch damaged or
not connected 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 or DHW sensor
detached from the pipe
Check the correct positioning and opera-
tion of the sensors
F42 Heating sensor fault Sensor damaged Replace the sensor
F43
Exchanger protection activa-
tion.
No system H
2
O circulation Check the circulating pump
Air in the system Vent the system
F50 Gas valve fault
Modulating Operator wiring discon-
nected Check the wiring
Faulty gas valve Check the gas valve and replace it if nec-
essary
A51 Poor combustion fault Inlet/exhaust flue obstruction Check the flue

DOMIcondens HE 26 C
10 EN cod. 3540Z850 - 12/2010 (Rev. 00)
5. TECHNICAL DATA AND CHARACTERISTICS
Table. 8 - Key of figures cap. 5
5.1 General view and main components
fig. 23 - General view
5.2 Water circuit
fig. 24 - Heating Circuit
fig. 25 - DHW Circuit
5 Sealed chamber 36 Automatic air vent
7 Gas inlet 38 Flowswitch
8 Domestic hot water outlet 42 DHW temperature sensor
9 Cold water inlet 44 Gas valve
10 System delivery 56 Expansion tank
11 System return 72 Room thermostat (not supplied)
14 Safety valve 81 Ignition and detection electrode
16 Fan 114 Water pressure switch
19 Combustion chamber 126 Contact fume thermostat
20 Burner assembly 138 External probe (not supplied)
21 Main nozzle 139 Room unit (not supplied)
22 Burner 145 Pressure gauge (water gauge)
26 Combustion chamber insulation 193 Trap
27 Copper exchanger for heating and hot
water
277 Recuperator
28 Fume manifold 278 Double sensor (Safety + Heating)
32 Heating circulating pump
32
5
27
19
26
81
16
56
278
10 8 9 11
20
21
42
44 38
277
126
14
114
36
193
7
22
28
145
11
9
10 8
278
38
42
16
277
126
27
32
114 36
14
56
11
9
10 8
278
38
42
16
277
126
27
32
114 36
14
56

DOMIcondens HE 26 C
11
EN
cod. 3540Z850 - 12/2010 (Rev. 00)
5.3 Technical data table 5.4 Diagrams
Pressure - power diagrams
fig. 26 - Pressure - power diagram
A =A = LPG - B = NATURAL GAS
Circulating pump head / pressure losses
fig. 27 - Circulating pump head / pressure losses Prodotto_24
A = Boiler pressure losses - 1, 2 and 3 = Circulating pump speed
Data Unit DOMIcondens HE 26 C
Max. heating capacity kW 25.0 (Q)
Min. heating capacity kW 10.0 (Q)
Max. Heat Output in heating (80/60°C) kW 24.4 (P)
Min. Heat Output in heating (80/60°C) kW 9.5 (P)
Max. Heat Output in heating (50/30°C) kW 26.0
Min. Heat Output in heating (50/30°C) kW 10.5
Max. Heat Output in hot water production kW 24.4
Min. Heat Output in hot water production kW 9.2
Efficiency Pmax (80-60°C) % 97.5
Efficiency Pmin (80-60°C) % 95.0
Efficiency Pmax (50-30°C) % 104
Efficiency Pmin (50-30°C) % 105
Efficiency 30% % 107
Efficiency class Directive 92/42 EEC -
NOx emission class - 3 (NOx)
Burner nozzles G20 no.x Ø 11 x 1.35
Gas supply pressure G20 mbar 20.0
Max. gas pressure at burner (G20) mbar 11.0
Min. gas pressure at burner (G20) mbar 2
Max. gas delivery G20 m
3
/h 2.64
Min. gas delivery G20 m
3
/h 1.06
Burner nozzles G31 no.x Ø 11 x 0.79
Gas supply pressure G31 mbar 37
Max. gas pressure at burner (G31) mbar 35.0
Min. gas pressure at burner (G31) mbar 5.0
Max. gas delivery G31 kg/h 1.96
Min. gas delivery G31 kg/h 0.78
Max. working pressure in heating bar 3 (PMS)
Min. working pressure in heating bar 0.8
Max. heating temperature °C 90 (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
DHW flowrate Dt 25°C l/min 14
DHW flowrate Dt 30°C l/min 11.6 (D)
DHW flowrate Dt 35°C l/min 10
Protection rating IP X5D
Power supply voltage V/Hz 230V/50Hz
Electrical power input W 135
Electrical power input in hot water production W 135
Empty weight kg 35
Type of unit C
12
-C
22
-C
32
-C
42
-C
52
-C
62
-C
72
-C
82
B
22
-B
32
PIN CE 0461BU0942
G. C . n o . - -
B
A
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

DOMIcondens HE 26 C
12 EN cod. 3540Z850 - 12/2010 (Rev. 00)
5.5 Wiring diagram
fig. 28 - Electrical circuit
81
1k W
L
N
230V
50 Hz
16
N
L
32
L
N
°
T
°
T
278
°
T
42
4321
44
38114
ABM01
193
126
N
DAY
22:00
04
REMOVE TO CONNECT
THE
CLOCK
139
138 72

Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This
does not affect the customer’s statutory rights.
If yes, and if required by the manufacturer, has a water scale reducer been fitted?
CONDENSING BOILERS ONLY
The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 Yes
If the condensate pipe terminates externally has the pipe diameter been increased and weatherproof insulation fitted? Yes

Service Record
It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.
Service Provider
Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the
manufacturer’s instructions.
Always use the manufacturer’s specified spare part when replacing controls.
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Operative ID No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Date:
Engineer Name:
Company Name:
Telephone No.
Gas Safe Register No.
Comments:
Signature:
Service 1 Service 2
Service 3 Service 4
Service 5 Service 6
Service 7 Service 8
Service 9 Service 10

Before contacting Ferroli please have available the
completed BENCHMARK document (located in the back of this manual),
boiler serial number and model detail.
For Technical assistance during the installation, call our
Technical Service Helpline on 0871 559 2927.
You will be required to provide your Gas Safe Register Number.
Should you require a Service Engineer to visit, call our
Service Centre on 0871 559 2924.
Calls to these numbers are charged at 8 pence per minute from BT landlines.
Calls from mobile networks may be considerable more.
Phone numbers:
Installer
Service Engineer
BECAUSE OF OUR CONSTANT ENDEAVOUR FOR IMPROVEMENT DETAILS
MAY VARY SLIGHTLY FROM THOSE QUOTED IN THESE INSTRUCTIONS.
ALL SPECIFICATIONS SUBJECT TO CHANGE
Please note - to avoid incurring unnecessary expense, in the event of a boiler shut down, check
this is not caused by lack of electricity supply, gas supply or low water pressure before calling our
Customer Service Helpline.