Ferroli DOMIcompact F 24 B Troubleshooting guide

wall-mounted gas fired,
condensing combination boiler
DOMIcompact F 24 B
G C N° 47-267-37
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
FOR THE UNITED KINGDOM &EIRE
cod. 3540B27/3 - 07/2006

Seasonal Efficiency
(SEDBUK)
band B

2
DOMIcompact F 24 B
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.
For EIRE (Southern Ireland) it is necessary to complete a “Declaration of Conformity” to indicate
compliance to I.S. 813. An example of this is given in the current edition of I.S. 813. In addition it is
necessary to complete the “Benchmark” logbook.
• "Ferroli declare that no substances harmful to health are contained in the appliance or used
during the appliance manufacture”.
• Read the warnings given in this manual thoroughly.
They provide important information for safe instal-
lation, use and maintenance
• The instruction manual, by law must be left with the
end user.
• If the appliance is sold or transferred to another
owner or if the owner moves, leaving the appliance
behind, always ensure that the manual is kept with
the appliance for consultation by the new owner
and /or installer.
• Incorrect installation or poor maintenance absolves
the manufacturer from all liability for damage to
persons and property.
• Installation and maintenance must be carried out
in accordance with current legislation, according
to the manufacturer’s instructions and by qualified
corgi registered engineer.
• Before service or maintenance work is carried out
isolate the appliance from the mains electricity
supply.
• In the event of malfunction or faulty operation, iso-
late the appliance. Do not attempt to repair or carry
out any other operation on the appliance directly.
Contact Ferroli or a qualified engineer only.
• Repairs or the replacement of components must be
carried out exclusively by qualified personnel using
original spare partsonly. Failure toadhere to theabove
may compromise the safety of the appliance.
• To guarantee efficient operation, the appliance must
be serviced once a year by a Corgi registered engi-
neer.
• The appliance may not be used for purposes other
than those for which it was explicitly designed.
• Incorrect installation and use or failure to follow the
instructions provided by the manufacturer absolve
the manufacturer from all liability for damage.
• After unpacking, check that the contents are correct
and undamaged.
• Keep packing out of reach of children as it could be
potentially hazardous.
• To clean external parts, use a damp cloth moistened
with soapy water if necessary. Avoid using abrasive
cleaning products and solvents.
This symbol indicates “Caution” and is placed next to all safety information.
Strictly follow these instructions in order to avoid danger and damage to persons
or property.
This symbol calls attention to a note or important information, please read thou-
rougly.
President and Legal Representative
Cav. del Lavoro
Dante Ferroli




Declaration of conformity
Manufacturer: FERROLI .p.A.
Address: Via Ritonda 78/a 37047 an 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)

3
DOMIcompact F 24 B
1. Operating instructions............................................................................4
1.1 Introduction ............................................................................................................4
1.2 Control panel ..........................................................................................................5
1.3 Turning on and off ..................................................................................................6
1.4 Adjustments ............................................................................................................6
1.5 Maintenance............................................................................................................8
1.6 Faults.......................................................................................................................8
2. Installation ..............................................................................................9
2.1 General Instructions................................................................................................9
2.2 Boiler location .......................................................................................................10
2.3 Boiler water connections ......................................................................................12
2.4 Connection to the gas system..............................................................................14
2.5 Electrical Connections ..........................................................................................14
2.6 Flue system ...........................................................................................................15
2.7 Condensate outlet connection .............................................................................23
3. Service and maintenance......................................................................25
3.1 Adjustments ..........................................................................................................25
3.2 Initial start-up........................................................................................................27
3.3 Maintenance..........................................................................................................28
3.4 Troubleshooting....................................................................................................30
4 Technical characteristics and data .........................................................31
4.1 Dimensions and connections ................................................................................31
4.2 General view and main components ....................................................................32
4.3 Hydraulic diagram.................................................................................................33
4.4 Technical data table..............................................................................................34
4.5 Diagrams ...............................................................................................................35
4.6 Time Clock ............................................................................................................36
4.7 Wiring diagram .....................................................................................................37
Benchmark................................................................................................38
cod. 3540B27/3


4
DOMIcompact F 24 B
1. OPERATING INSTRUCTIONS
1.1 Introduction
Dear Customer,
Thank you for choosing DOMIcompact F 24 B, a FERROLI wall-mounting boiler featuring advanced
design and technology, high reliability and quality construction. Please read this manual carefully and
keep it for future reference.
DOMIcompact F 24 B is a high-efficiency condensing appliance for heating and hot water production
running on natural or liquefied petroleum gas (configurable at the time of installation) and regulated by
an advanced microprocessor control system.
The boiler shell consists of a primary copper laminar heat exchanger, a secondary aluminium heat
exchanger providing effective condensation of the water vapour contained in the flue gases, and burner
equipped with electronic ignition and ionization flame control.
The boiler is totally room sealed from the installation room: the air required for combustion is drawn
from outside. The boiler also includes a fan, modulating gas valve, pump, expansion vessel, flow switch,
safety valve, temperature sensors, a safety thermostat and a low pressure switch.
Thanks to the microprocessor control and adjustment system with advanced self-diagnosis, unit ope-
ration is for the most part automatic. The power for heating is automatically governed by the control
system combined with the room thermostat (not supplied). The power for hot water is automatically and
continually governed to ensure a fast delivery and comfort under all operating conditions.
The user only has to set the temperature desired inside the home (by means of an optional room
thermostat or remote control, which is required under the building regulations 2002) or regulate the
temperature of the system, and set the desired outlet temperature for the hot water. The adjustment
and control system will provide optimum operation throughout the year.
The display continuously provides information on the unit’s operating status and it is possible to obtain
additional information on the sensor temperatures, set-points, etc, or configure them. Any operating
problems associated with the boiler are immediately signalled by the display and, if possible, corrected
automatically.

5
DOMIcompact F 24 B
1.2 Control panel
The control panel is composed of a multi-function button, two knobs and a display.
Key
1Heating temperature adjustment and Summer/
Winter/ switch off control
2Hot water temperature adjustment and switch
off control
3Multi-function button (ECO/RESET/TEST)
4Temperature display
During operation or standby in heating mode,
it displays the temperature of the heating
sensor. During hot water operation, it displays
the temperature of the hot water sensor.
5Heating demand symbol
Appears during heating operation or when
adjusting the heating set-point temperature
6Flame symbol
Appears when the burner is on
7ECO symbol
ECO is displayed when the Economy function is on
8Hot water demand symbol
Appears during hot water operation or when adjusting the hot water set-point temperature
Fig. 1
Boiler on stand-by
Boiler on stand-by / ECO
Heating operation
(burner on)
Hot tap water operation
(burner on)
Fault codes ( ee chap. 1.6 or 3.0)
TE T mode operation
(burner on)
Boiler off
Display Type of operation
(Frost protection active)
(No demand from heating or Hot water)
(Displays heating flow temperature)
(Displays Hot water temperature)
(Displays relevant fault code)
(For comissioning purposes only)
Information during operation
During normal operation, the boiler diagnostics display the running information or boiler status on the
control panel (Fig.1).see below.

6
DOMIcompact F 24 B
1.4 Adjustments
Boiler off Boiler in Summer operation
(only hot water production is active)
Boiler with only heating on and hot
water off (Display indicates heating demand)
Boiler in Winter operation
(Display indicates hot water demand)
1.3 Turning on and off
Ignition
• Open the gas isolation valve on the boiler.
• Purge the air from the pipe work to the gas valve.
• Turn on the 3amp electrical switch or insert the plug to the
boiler.
• Turn the heating and hot water control knobs onto their required
temperatures (see par. 1.4).
• The boiler is now ready to function automatically whenever hot
water is drawn or both the time clock and room thermostat call
for heating.
Turning off
Turn the knobs (ref. 1 and 2 Fig. 1) onto minimum.
If the boiler is turned off this way, then the P.C.B is still powe-
red.
Hot water and heating operation are disabled, the display shows
; but the frost protection function remains active
The frost protection will not work if the electricity and/or gas supply to the unit are cut off.
To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the boiler, the tap water and the system water; or drain off just the tap water and
add a suitable antifreeze to the heating system, as prescribed in chap. 2.3.
Summer/winter Switchover
Depending on the position of the control knobs “1” and “2” it is possible to switch off the boiler unit,
switch between summer and winter operation or turn off the domestic hot water .

7
DOMIcompact F 24 B
Switching off the boiler. Switching between summer and winter operation has priority over the
heating only time control (optional) when this is connected to the boiler.
C.H. temperature setting
To set the system delivery temperature, turn the knob (ref. 1- Fig. 1).
It can vary from a minimum of 30 °C to a maximum of 85°C; however, it is advisable not to operate the
boiler below 45 °C. When the knob is turned the display lights up, the radiator symbol flashes and the
temperature displayed will be the temperature actually set. On completing this operation, the display
will stay on for another 5 seconds and then go back to the actual operating temperature providing
there is a demand.
Domestic Hot water temperature adjustment
To set the tap water temperature, turn the knob (ref. 2- Fig. 1).
It can vary from a minimum of 40 °C to a maximum of 55 °C. When the knob is turned the display lights
up, the tap symbol flashes and the temperature displayed will be the temperature actually set. On
completing this operation, the display will stay on for another 5 seconds to then go back to the actual
operating temperature providing there is a demand.
If the boiler is connected to the optional remote open therm control, the above adjustments
(system and hot water temperature) can only be made with the remote control.
ECO/COMFORT selection
The unit is equipped with a special internal device that ensures a high hot-water delivery speed and
excellent user comfort. When comfort mode is active the water in the boiler is maintained at a pre-
determined temperature, which means that hot water is available at the boiler outlet as soon as a tap
is opened, ie with no waiting.
The user can turn the device off (ECO mode) by pressing the multi-function button for 2 seconds with
the boiler on standby. In ECO mode the display shows the relevant symbol. To turn on COMFORT mode,
press the multi-function button again for 2 seconds, the ECO symbol will vanish from the display.
TEST MODE selection
Pressing the multi-function button 3 times in 3 seconds turns on TEST mode (the heating and hot
water symbols flash simultaneously - see par. 3.1). If TEST mode is turned on by accident, press
the button 3 times in 3 seconds again to exit (Test time 15 minutes unless cancelled early).

8
DOMIcompact F 24 B
1.5 Maintenance
It is strongly recommended to carry out annual maintenance on the boiler and the heating system. Please
refer to the “maintenance” section in this manual.
The casing, the control panel and the aesthetic parts of the boiler can be cleaned using a soft and damp
cloth.
Do not use abrasives or solvents.
1.6 Faults
The boiler is equipped with an advanced self-diagnosis system that signals any faults on the display.
Some faults (from F1 to F3) cause a boiler shutdown. In this case, operation must be reset manually by
pressing the multi-function button (RESET) for 1 second
Other faults (from F5 to F37) cause temporary shutdowns that are automatically reset as soon as the
value causing the fault comes back within the boiler’s normal working range.
Listed below are some anomalies that can be caused by simple, user-solvable problems.
If the problem remains after two attempts at resetting, contact the Ferroli Service Centre.
For other faults, refer to section 3.4 “Troubleshooting”.
Boiler shutdown
Low system pressure
Make sure that the gas cocks ahead of the boiler and on the
meter are open. Check condensate discharge, make sure it is
clean and not obstructed.
Press the multi-function button (for 1 second) (fig.1)
In case of repeated shutdowns, contact the nearest assistance
centre.
Fill the 'system to 1-1.5 bar cold by means of the 'filling point
C.h. (see page 11)
Fault CureDisplay code
Before calling a Ferroli service engineer, check that the problem is not due to there being no
gas or electricity, or low system pressure.

9
DOMIcompact F 24 B
2. INSTALLATION
2.1 General Instructions
This device must only be used for the purpose for which it is specially designed. 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 considered improper.
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 RECOMENDATION OF BS STANDARDS, ANY LOCAL REGULATIONS AND THE RULES OF
COMPETENT WORKMANSHIP.
In IE, the installation must be carried out by a Competent Person and installed in accordance with the
current edition of I.S. 813 “Domestic Gas Installations”, the current Building Regulations and reference
should be made to the current ETCI rules for electrical installation.
Incorrect installation can cause damage or physical injury for which the manufacturer declines any
responsibility.
This appliance must be installed strictly in accordance with these instructions and
regulations:
The Gas Safety Regulations (Installations & Use).
The Local Building Regulations.
The Building Regulations (Part L).
The Buildings Standards (Scotland - Consolidated) Regulations.
British Standards Codes of Practice:
B.S. 5440 Part 1 Flues
B.S. 5440 Part 2 Air supply
B.S. 5449 FORCED CIRCULATION HOT WATER SYSTEMS
B.S. 6798 INSTALLATION OF GAS FIRED HOT WATER BOILERS
B.S. 6891 GAS INSTALLATIONS
B.S. 7671 IEE WIRING REGULATIONS
B.S. 4814 SPECIFICATION FOR EXPANSION VESSELS
B.S. 5482 INSTALLATION OF LPG
B.S. 3632 RESIDENTIAL PARK HOMES
B.S. 7593 TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS
B.S. 5546 INSTALLATION OF HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
I.S. 813 DOMESTIC GAS INSTALLATIONS (EIRE ONLY)
Local Water Bye Laws
B.S. 5955-8 PLASTIC PIPEWORK INSTALLATION
For Northern Ireland the rules in force apply

10
DOMIcompact F 24 B
Minimum
A
B
D
5 cm
20 cm
60 cm
(via an openable panel)
C20 cm
Table 1
fig. 2
fig. 3
D
A A
B
C
2.2 Boiler location
The boilers combustion chamber is sealed off from the installation room. The installation room must be
sufficiently well ventilated to prevent any dangerous conditions from forming in the event of even slight
gas leakage. This safety standard is required by the 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 design to be installed on a solid wall. The wall fixing must ensure a stable and effective
support for the appliance, using the bracket and fixings supplied.
If the unit is enclosed in a cupboard or mounted alongside, there must be space for normal maintenance
work. Fig. 2 and tab. 1 give the minimum clearances to leave around the unit.
This appliance does not require compartment ventilation for combustion purposes
Drilling Template
Select suitable mounting position for boiler, using the template mark flue outlet and boiler mounting
points. Drill two 10mm holes 70mm deep to accept the wall plugs. Fit the supplied wall plugs on the
left and right side drill and fit the special wall plug in the middle (fig. 3). Fix the wall bracket to the wall
using standard lock nuts (M8) on both sides. Using a Core drill cut a 118mm diameter hole for the flue
as detailed on page 17. Mount the boiler on the wall bracket and secure using the special antitheft nut
(M8) as described in the fig. 3.

11
DOMIcompact F 24 B
fig. 4
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
fig. 5
3
2
1
4
Cold water mains
Make Up Water
Provision must be made for replacing water lost from the sealed system. Reference should be made
to BS6798, for methods of filling and making up sealed systems. There must be no direct connection
between the boiler's central heating system and the mains water supply. The use of mains water to
charge and pressurise the system directly, is conditional upon the Local Water Byelaws. Again any such
connection must be disconnected after use. The temporary filling loop (Not supplied) is shown in fig. 5.
Ensure the filling point is on the return pipe to the boiler.
Attention - is drawn to the Local Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and certain
water undertakings will not accept their use above ground.
Ensure all pipework is adequately supported
NOTE: An automatic bypass capable of
passing 6 ltrs per minute must be fitted as
far as possible from the boiler if thermosta-
tic radiator valves are fitted thoughout.
As per the building regulations part ‘L’
Key
1 Filling point C.H 15mm
isolation valve.
2 Temporary flexible connection
3 Cold water supply 15mm
isolation valve
4 Double check valve

12
DOMIcompact F 24 B
Key
1 System flow (22 mm with isolation valve fitted)
2 DHW outlet (15 mm with isolation valve fitted)
3 Gas inlet (22 mm with isolation valve fitted)
4 Cold main inlet (15 mm with isolation valve fitted)
5 System return - (22 mm with isolation valve fitted c/w filter)
6 Condense outlet
It is essential to install the isolation valves supplied between the boiler and heating system, allowing the
boiler to be isolated from the system if necessary.
The safety valve outlet must be connected to a 15 mm pipe to allow safe discharge to the outside
ground in the event of over-pressure in the heating circuit. If this is not done, and the drain valve
opens and floods the room, the boiler manufacturer is not to be held responsible. The pipework
must have a continuous fall from the boiler, The outlet should face back against the outer bri-
ckwork or building face to prevent harm or injury from hot water discharging in the evet of an
over-pressuried system.
Make the boiler connection in such a way that its internal pipework is free of stress.
If a check valve is installed on the tap water circuit (where applicable), it is necessary to mount a safety
valve between the boiler and this circuit (check valve minimum 3 meters from boiler).
fig. 6
2.3 Boiler water connections
The heating capacity of the unit should be previously established by calculating the building’s heat
requirement according to current regulations. For efficient operation and long life of the boiler, the
plumbing system must be well designed and always complete with all those accessories that guarantee
regular operation and running, ie room thermostat, trv’s and automatic bypass etc.
If the flow and return pipes follow a path where air pockets could form in certain places, it is esential
to install air vent valves at these points. Also, install a type “A” drain cocks at the lowest points in the
system to allow its complete draining.when required The temperature differential between the flow
manifold and the return to the boiler should not exceed 20° C.
A minimum flow of 6 litres/min is requied through the heat exchanger, it is therefore essential to fit an
automatic by-pass a min of 3 metres away from the appliance, This should be calibrated on site.
Do not use the water system pipes to earth electrical
appliances.
Before installation, carefully flush all the pipes of the heating
system to remove residues or impurities that could affect the
unit’s efficient operation (BS 7593 Building regs Doc L).
Make the connections to the appliance as shown in fig. 6.
36 95 60 60 95 114
149
97
1 2 3 5
4

13
DOMIcompact F 24 B
The connecting kits shown in fig. 7 are supplied as standard.
fig. 7
Water treatment
When treatment is used ferroli limited only recommend the use of proprietary Brands, such as Fernox or
Sentinel water treatment products, which must be used in accordance with the manufacturers instruc-
tions,
For further information contact:
Fernox Manufacturing Co. LTD.
Cookson Electronics, Forsyth Road
Sheerwater,Woking,Surrey GU21 5RZ
Tel: [phone]
Sentinel Division
Betz Dearborn LTD
Widnes, Cheshire WA8 8ND
Tel: [phone]
Note - When the boiler is installed with an existing or new system any unsuitable additives or system
debris must be removed by thorough chemical cleansing. All systems should be cleansed according to
B.S. 7593.
Note - It is important that the correct concentration of the water treatment product is maintained in
accordance with the manufacturers instructions.
Note - In hard water areas it may be necessary to install a scale reducer prior to the boiler on the cold
water inlet.
Key
A = Nut
B = Compression olive
D = 3/4 seal (green)
E = 1/2 seal (green)
F = 1/2 gas seal (blue)
G = Filter
H = Cap
Flow isolation valve
Hot water connection
Return isolation valve
Ø22
Ø22
Ø15
A
A
AB
B
B
D
D
E
Cold water isolation valve
Ø15
AB
E
Gas isolation valve
Ø22
AB
F

14
DOMIcompact F 24 B
2.4 Connection to the gas system
If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to
establish the availability of an adequate supply of gas.
An existing service pipe must not be used whitout prior consultation with the local Gas supplier.
A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers Contractor.
Installation pipes should be fitted in accordance with BS6891.
Appliance inlet working pressure must be 20 mbar MINIMUM, for NG and 37 mbar minimum for pro-
pane.
Do not use pipes of a smaller diameter than the combination boiler inlet gas isolation valve (22 mm).
The complete installation must be tested for gas soundness and purged as described in BS6891.
All pipework must be adquately supported. An isolating gas valve is provided and must be fitted
on the boiler gas inlet. Please wait 10 minutes when lighting from cold before checking the gas
rate, this will ensure thermal equilibrium.
2.5 Electrical Connections
The unit must be installed in conformity with current national and local regulations inc 16th Edition &
B.S 7671.
Connection to the electrical supply.
The boiler must be connected to a single-phase, 230 Volt-50 Hz electrical supply.
The unit’s electrical safety is only guaranteed when correctly connected to an efficient earthing
system installed according to current safety standards and checked by a professionally qualified
person. 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, in particular ensuring that the crossectional area of the
electrical cables are suitable for the power absorbed by the unit.
The boiler is prewired and provided with a cable for connection to the electrical supply The prewired
cable must be connected to the supply with a permanent connection and equipped with a double pole
switch which contacts have a minimum opening of at least 3 mm, and fused at max. 3A between the
boiler and the line. It is important to check the polarities (LIVE: brown wire / NEUTRAL: blue wire /
EARTH: yellow-green wire) and ensure they are correctly connected to the corresponding terminals on
the electrical supply.
The user must never change the boilers power cable. If the cable gets damaged, switch off the unit
and have it changed only by professionally qualified personnel. If changing the electric power cable,
use only “HAR H05 VV-F” 3x0.75 mm2cable with a maximum outside diameter of 8 mm.
5 Core cable must not be used to replace the existing 3 core!

15
DOMIcompact F 24 B
B
Fig. 8c
Fig. 8b
AA
Fig. 8a
1
2
Room
thermostat
1
2
Remote
timer
control
(Opentherm)
Or
Access to the electrical terminal block
To access the terminal block where the room thermostat (Low voltage) or the remote timer control is
to be connected, carry out the following operations:
1Unscrew the two screws “A” (Fig. 8a)
2Lower the instrument panel (Fig. 8b)
3Turn the instrument panel (Fig. 8c)
You can now access the terminal block “B”
(Fig. 8c)
2.6 Flue system
The unit is “type C” with a sealed chamber and forced draught, the air inlet and flue outlet must be
connected to one of the following flue systems. With the aid of the tables and methods of calculation indi-
cated, before commencing installation, it is first necessary to check that the flue system does not exceed
the maximum permissible length. The current standards and local regulations must be observed.
It should be noted that only Ferroli flue system and accessories should be used on this appliance,
as per BS 5440 2000 and C.E. test certification.
Low voltage time
clock or

16
DOMIcompact F 24 B
1
fig. 9
Choice of restrictor:
• With the 2 pipe system:
- Calculate the total flow resistance of the
combined air and flue pipes in metres.
- utilise the table shown below to choose
the most suitable restrictor for the flow
resistance calculated (see page 19)
• With concentric systems:
- Choose correct restrictor from table below.
(see page 17 & 18)
N.B.: the diameter of the hole is
stamped on the restrictor
RESTRICTOR FOR TWO PIPE SYSTEM
Total flow resistance
of flue system
Use
restrictor
size
minimum maximum mm
0 m 20 m 43
20 m 55 m No restrictor
RESTRICTOR FOR CONCENTRIC SYSTEM
Flue lenght up to:
Use
restrictor
size
Concentric
60 / 100
1 bend + 1 metre 43 mm
1 bend + 3 metres No restrictor
Concentric
80 / 125
1 bend + 5 metres 43 mm
1 bend + 12 metres No restrictor
Restrictor
This appliance is factory fitted with the correct restrictor for use with a standard 100mm concentric flue
terminal of less than 1mtr.For different flueing applications choose the correct size restrictor from the
tables below. To change the restrictor please follow the instructions below, shown in figure 9.
Determine the correct size of flue restrictor required, before installing the standard concentric flue kit
onto the boiler, check that the restrictor fitted is 50mm diameter and that it is correctly positioned (see
fig. 9).

17
DOMIcompact F 24 B
* = between
10 and 60 mm
Drill the wall 10÷20 mm
more than the pipe diameter
010008X0
* = between
10 and 60 mm
Drill the wall 10÷20 mm
more than the pipe diameter
95
12550* 12550*
12550*D
L
30
95
254206
L
P
50*
98
98
95
30
254206
30
Fall back to boiler
3mm/metre
Fall back to boiler
3mm/metre
1KWMA56W
Fall back to boiler
3mm/metre
Fall back to boiler
3mm/metre
D
95
30
P
Side view
View from above
fig. 10a
Side Outlet
fig. 10b
Front view
View from above
P = S + 83 mm
Rear Outlet
L = S + D + 239 mm
Horizontal flue installation
1.Define the Suitable position for installing the boiler(See 2.2 Boiler location).
2.When installing a horizontal flue kit, please ensure a 3 mm per metre fall back to the appliance is incor-
porated.
3.Make a hole of diameter 10 - 20 mm greater than the nominal diameter of the concentric pipe used.
4.If necessary, cut the end pipe to size, ensuring that the external pipe protrudes from the wall by between
10 and 60 mm (Fig. 10a and 10b). Remove all cutting burrs and lubricate the seals with a suitable silicone
based grease.
Connection with concentric flue system
The unit can be connected to a concentric air/flue duct with a horizontal or vertical outlet as shown in
the following drawings. Numerous accessories are available on request to meet the various installation
requirements. Please refer to our “flue manual” or the price list for details.
Horizontal concentric flue installation

18
DOMIcompact F 24 B
Vertical Outlet
fig. 10c
The total length in equivalent metres of the
concentric flue must not exceed the maximum
lengths stated in the following table, note that
each bend gives an increase to the stated reduc-
tion. For example, a duct = 60/100 composed of
1 bend of 90° +1 horizontal metre + 2 bends of
45° + 1 horizontal metre has a total equivalent
length of 4 metres. Angled roof tile
1KWMA82U
1KWMA56U
950
50
010009X0
max. 4 metres 60/100 max. 12 metres 80/125
Roof end piece
1KWMA83U
68
95050
50 950
50
1000 125
10
Reduction factors for bends
Concentric bend at 90° - Ø 60/100 mm
Concentric bend at 45° - Ø 60/100 mm
Concentric bend at 90° - Ø 80/125 mm
Concentric bend at 45° - Ø 80/125 mm
1m
0.5 m
0.5 m
0.25 m
Table 2b
Maximum permissible
duct length (Horizontal)
Ø mm
0/100
3 m 12 m
Ø mm
80/125
Table 2a
Maximum permissible
duct length (vertical)
4 m 12 m
5.Connect the flue to the boiler, positioning the seals correctly. Seal the flue into the wall with silicone or
sand & cement and cover with wall seals provided.
Flue seals should be lubricated with a silicone type grease to prevent damage (grease not sup-
plied)

19
DOMIcompact F 24 B
1
3
4
2
1KWMA84U
1KWMA82U
1KWMA83W
Ref.
1
2
3
4
N° Pieces
1
1
1
1
Vertical flue pipe Ø80
Vertical air pipe Ø80
Vertical flue terminal
Two pipe adaption kit (1KWMR54A)
Description Equivalent
loss
25,6 m
16,0 m
12,0 m
0,0 m
53, m
Total
Table 3
fig. 11
fig. 12
2
Ø80
AIR
Ø80
FUMES
Remove
the closing
cap
1
Two pipe adaption
kit cod. 1KWMR54A
Connection with 80 mm pipe system
The unit can be connected to a system of sepa-
rate air/flue pipes for a horizontal or vertical
outlet as shown on the fig. 11- 12. Numerous
accessories are available on request to meet
the various installation requirements.
Please refer to the flue manual catalogue or the
price list for additional components.
To check you do not exceed the maximum per-
missible flue length, it is necessary to make a
simple calculation prior to installation:
1. For each component, tables 4 - 5 (page
20) provide an “equivalent loss in metres”,
depending on theposition of installation ofthe
component (with air intake or flue extraction,
vertical or horizontal).
The loss is called “equivalent length” since it
is compared to the loss of one metre of flue
(defined as equal to 1). For example, a bend
at 90° of Ø80 in flue run has an equivalent loss
of 2.5 linear metres, i.e. it has a loss equal to
that of 2.5 metres of flue length.
2. After designing the layout of the system, add
up the losses in equivalent metres, depending
on the installation position, of all the compo-
nents and accessories in the system.
3. Check that the total calculated loss is less
than or equal to 55 equivalent metres, i.e.
the maximum permissible for this model of
boiler.
For further flue options please contact
FERROLI or check our comprensive flue
manual.

20
DOMIcompact F 24 B
Table of flue and accessories
KWMA86A
KWMA85A
KWMA84U
Air Flue
Vertical Horizontal Vertical Horizontal
KWMA65W
KWMA01W
KWMA83W  1,00 m
Description
Pipe Ø 80
male-female
Bend 45° Ø 80 mm
male - female
Bend 90° Ø 80 mm
male - female
Description
Horozontial
flue terminal
Horozontial
air terminal
Vertical flue
terminal
1 1 1.6 2
1.2 1.8
1.5 2.0
Equivalent losses in
metres (linear)
5
2
Air Flue
Vertical Horizontal Vertical Horizontal
Equivalent losses in
metres (linear)
12
Accessories Ø 80 Accessories Ø 80
Table 4 Table 5
The stated loss values refer to genuine Ferroli flue accessories.
Terminal Position
P
D, E
Q
Q
l
BC
A
G
F
L
J
HH
K
N
N
MM
Q