Ferroli DOMIcompact F 24 B Instructions For Use, Installation And Maintenance

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 Effi ciency

(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 instal­lation, 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, iso­late 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 parts only. Failure to adhere to the above
may compromise the safety of the appliance.

• To guarantee efficient operation, the appliance must
be serviced once a year by a Corgi registered engi­neer.

• 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 thou­rougly.

President and Legal Representative

Cav. del Lavoro

Dante Ferroli







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)

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 ope­ration 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

1 Heating temperature adjustment and Summer/

Winter/ switch off control

2 Hot water temperature adjustment and switch

off control

3 Multi-function button (ECO/RESET/TEST)
4 Temperature 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.
5 Heating demand symbol
Appears during heating operation or when

adjusting the heating set-point temperature
6 Flame symbol
Appears when the burner is on
7 ECO symbol
ECO is displayed when the Economy function is on
8 Hot 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 (See chap. 1.6 or 3.0)

TEST 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 pre­determined 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)

C 20 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 thermosta­tic 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 bri­ckwork 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 point s 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

46

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 Brand s , such as Fernox or
Sentinel water treatment products, which must be used in accordance with the manufacturers instruc­tions,

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

A

B

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 mm2 cable 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

A

A

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:

1 Unscrew the two screws “A” (Fig. 8a)
2 Lower the instrument panel (Fig. 8b)
3 Turn 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 indi­cated, 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

125S 50* 12550*

12550*SD

L

30

95

254206

L

P

50*S

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 S

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 incor­porated .

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 reduc­tion. 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

60/100

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 sup­plied)

19

DOMIcompact F 24 B

1

3

4

2

1KWMA84U

1KWMA82U

1KWMA83W

Ref.

1
2
3
4

N° Pieces

16
16

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

53,6 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 sepa­rate 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 per­missible 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 the position of installation of the
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 compo­nents 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

B

C

A

G

F

L

J

H

H

K

N

N

MM

Q

21

DOMIcompact F 24 B

The plume should not cross:

• a frequently used access route;

• any frequently used area (such as a patio or car parking space);

• a neighbouring dwelling.

Nor should it be directed towards a window or door, or be sited close to a
facing wali or other surface.

There are also other aspects to consider when planning the flue terminal position.

• A free passage of air is needed at all times to aid plume dispersal - which may be difficult in sheltered
locations.

• In cold weather, the condensate could cause a safety hazard if it freezes on pathways, or if it results in
frost damage to surfaces.

• The plume could trigger infra-red security lighting if sited in the wrong place.

• Ensure terminals do not obscure security camera field of vision.

• The terminal guards must be able to resist corrosive properties of the condensate.

Statutory mininum distances for terminai siting

A - minimum distance 600mm - may be a nuisance if it ‘wets’opposite boundary, crosses

main pathway or condensate can drip on pathway.
B - minimum distance 600mm - may be a nuisance as plume could obscure window.
C - minimum distance 600mm - may be a nuisance if plumecrosses door.

A

B

C

Opposite
boundary

Pathway

22

DOMIcompact F 24 B

Minimum Dimensions of Flue Terminal Positions

Directly below an opening, air brick,
opening windows, etc.

Above an opening, air brick,

opening windows, etc.

Horizontally to an opening, air brick,

opening windows, etc.

Below gutters, soil pipes or drain pipes

Below balconies or car port roof

Below eaves

From a vertical drain pipe or soil pipe

From an internal or external corner

From a surface facing the terminal

From a terminal facing the terminal

From the wall on which the terminal is mounted

From a vertical structure on the roof

Above intersection with roof

Horizontally from a terminal on the same wall

Vertically from a terminal on the same wall

From an opening in the car port (e.g. door,
window) into the dwelling

Above ground roof or balcony level

300mm

300mm

300mm

200mm

75mm

200mm

150mm

100mm

300mm

600mm

300mm

300mm

150mm

1200mm

1200mm

1500mm

N/A

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

NOTE

N/A = Not applicable

In addition, the terminal must not be nearer than 300mm to an opening in the
building fabric formed for the purpose of accommodating a built-in element
such as a window frame.

Condensing Terminal Positions: If the flue is to be terminated at low level, then the
potential effect of the plume must be considered.

The plume should not be directed:

across a frequently used access route

across a neighbouring property

towards a window or door

23

DOMIcompact F 24 B

fig. 13

2.7 Condensate outlet connection

Connection to collective flues or single flues with natural draught

If you are then going to connect the DOMIcompact F 24 B 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 standards and rules in force.

In particular, flues must have the following characteristics:

• Be sized according to the method of calculation stated in the standard

• Be airtight to the products of combustion, resistant to the fumes and heat and waterproof for the con­densate

• Have a circular or square cross-section (some hydraulically equivalent sections are permissible), with a
vertical progression and with no restrictions

• Have the ducts conveying the hot fumes adequately distanced or isolated from combustible materials

• Be connected to just one unit per floor, for at most 6 units in all (8 if there is a compensation duct or
opening)

• 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 of at least 0.5 m, equipped
with a metal door with an airtight closure.

The boiler is equipped with an internal siphon -trap to drain off the condensate. Screw on the inspection
bowl A and the push in the flexible hose B (approximately 3 cm), then tighten the compression collar
on the trap .

Fill the siphon-trap with approximately 0.5 ltrs. of water and connect the hose to the waste
system or soakaway

0,5 l.

24

DOMIcompact F 24 B

fig. 14

Condensate discharge

Where possible the condensate should discharge into an internal soil pipe or waste system. The minimum
pipe diameter required is 22 mm, a trap has already been fitted to the appliance with a flexible hose to
facilitate the connection to the condensate discharge pipe.

The pipe should be a solvent weld plastic, not copper, as the condensate has a ph value of 4 (slightly
acidic).

Where it is not possible to terminate internally, the condensate discharge pipe may be run outside (see
below drawing).

Any external run is subject to freezing, in severe weather conditions. To avoid this the pipework should
be installed to dispose of the condensate quickly, with as much as possible run internally, before passing
through the wall.

Pipework external to the building should be increased in diameter to 32 or 40 mm solvent weld. It should
be run to a external drain or soakaway, with a maximum length of 3 metres.

If a soakaway (condensate absorption point) is used, it should be constructed as shown below.

External legth of
pipe 3m max.

32/40Ø min.

500

Ground
(either/or)

25 min.

300 min.

Hole depth 400 min.

Two rows of three
12 mm holes at 25 mm centres
50 mm from bottom of tube and
facing away from house

The gradient of the discarge pipe should be 2.5° (45 mm/m) minimum.

Limestone

cladding

Bottom of

tube sealed

Ø 100

plastic tube

25

DOMIcompact F 24 B

X3

3. SERVICE AND MAINTENANCE

3.1 Adjustments

All adjustment and conversion operations must be carried out by a Qualified and trained engineer such
as a Ferroli Service.engineer

FERROLI S.p.A. declines any responsibility for damage or physical injury caused by unqualified and
unauthorised persons tampering with the device.

Gas supply conversion

The unit can function with either Natural Gas or LPG and is factory-set for use with one of the two gases,
as clearly shown on the packing and on the unit’s dataplate. Whenever a different gas to that for which
the unit is preset has to be used, a conversion kit will be required, proceeding as follows:

1. Replace the injectors at the main burner, by inserting those specified in the technical data table in chap.
4, according to the type of gas used

2. Adjust the burner minimum and maximum pressures (ref.to page 33), setting the values given in the
technical data chart for the type of gas used.

3. How to Adjust the parameter for the specific type of gas to be used:

- turn the boiler onto standby

- press the RESET button for 10 seconds

- P1 will appear on the display

- press the RESET button for 5 seconds

- turn the hot water knob (ref. 2 - fig 1) onto “0” (for Natural Gas operation) or onto “1” (for LPG
operation)

- press the RESET button for 5 seconds

- P2 will appear on the display

- turn the heating knob (ref. 1 - fig 1) onto minimum and then onto maximum

- the boiler will go back onto standby

- turn the heating & hot water knobs onto the set temperatures.

4. Attach the sticker contained in the conversion kit, near the dataplate, as proof of the conversion.

Turning on TEST mode

To turn on TEST mode, press the multi-function button 3 times
in 3 seconds.

The display will show the radiator and hot water symbols flashing,
the current heating power, the ECO symbol (if ECONOMY mode
is on) and the flame symbol.

To exit TEST mode, press the multi-function button 3 times in 3
seconds.

TEST mode turns off automatically after 15 minutes.

26

DOMIcompact F 24 B

fig. 15

Adjusting burner pressure

Since this unit has flame modulation, there are two fixed pressure settings: the minimum and maximum,
which must be as stated in the technical data chart according to the type of gas.

• Connect a suitable pressure gauge to pressure point “B” downstream from the gas valve.,having loo­sened it first

• Disconnect the pressure compensation tube “H”.

• Take off the protective cap “D”.

• Run the boiler in TEST mode (press the multi-function button 3 times in 3 seconds):

- TEST mode on: turn the heating knob (ref. 1 - fig 1) onto maximum.

• Adjust the maximum pressure with the screw “G”, clockwise to increase it and anticlockwise to decrease
it.

• Disconnect one of the two electrical connectors from the modureg “C” on the gas valve.

• Adjust the minimum pressure with the screw “E”, clockwise to decrease it and anticlockwise to increase it.

• Reconnect the electrical connector disconnected from the modureg on the gas valve.

• Check that the maximum pressure has not changed.

• Reconnect the pressure compensation tube “H”.

• Put the protective cap “D” back on.

• To end TEST mode, repeat the sequence for turning it on or wait 15 minutes

• Shut down the boiler

• Remove the pressure gauge

• Re-seal test point ‘B’

• Re-light the boiler and check for gas leaks using a suitable “Leak detection fluid”

Key

B Pressure point
C Modureg electrical connection
D Protective cap
E Minimum pressure adjustment
G Maximum pressure adjustment

Having disturbed test point ‘B’ when
checking or adjusting the gas pressures,
it is considered mandatory to check for
gas leaks using a suitable leak detection
fluid or sniffer.at that connection

27

DOMIcompact F 24 B

Adjusting the maximum heating output

To adjust the heating power, set the boiler on TEST operation (see par. 3.1). Turn the heating tem­perature control knob (ref. 1 - Fig. 1) clockwise to increase the power or anticlockwise to decrease it
(see pressure/power diagram Fig. 21). The display shows the power setting from 0 to 99%. Exit TEST
operation (see par. 3.1). The maximum heating power will remain as set during the TEST mode. (100%
output shown as 99% due to the display only being 2 digits ).

Ignition power adjustment

To adjust the ignition power, set the boiler on TEST operation (see par. 3.1).
Turn the hot water temperature control knob (ref. 3 - Fig. 1) clockwise to increase the power or anti-

clockwise to decrease it (see pressure/power diagram Fig. 21). The display shows the power setting
from 0 to 60%. Exit TEST operation (see par. 3.1). The ignition power will remain as set during the TEST
mode.

NOTE Recomended ignition pressure for standard 100mm concentric horizontal flueing is 30%

3.2 Initial start-up

Commissioning must be performed by Qualified Personnel only!.
Checks to be made at initial start up, and after all maintenance operations that involved discon­necting from the system or an intervention of a safety device.

Before lighting the boiler:

• Open any isolation valves between the boiler and the systems.

• Check the soundness of the gas system, proceeding with caution and using a suitable leak detection
fluid to detect any leaks in connections.after completing a tightness test

• Fill the water system and make sure that all air contained in the boiler and the system has been vented
by opening the air vent valve on the boiler and any vent valves on the system.

• Make sure there are no water leaks in the system, hot water circuits, connections or boiler.

• Make sure the electrical supply is correctly connected.

• Make sure that the unit is connected to a good earthing system.

• Make sure that there is sufficient gas available to produce safe combustion. (min inlet working pressure
= 20mbar).

• Make sure there are no flammable liquids or materials in the immediate vicinity of the boiler.

Lighting the boiler

• Open the gas isolation valve on the boiler.

• Purge the air from the gas pipe work to the boiler.

• Switch on the electrical supply to the boiler.

• Turn control knob “1” (Fig. 1) onto Winter in correspondence with a value greater than 50 °C and ensure
the room thermostat is calling, At this point, the burner will light and the boiler begins to function
automatically, controlled by its software and safety devices.

If, after following the lighting procedure, the burners do not light and fault F1 is generated, press
the RESET button for 1 second and release it. The software will repeat the ignition cycle in the
next 30 seconds. If the burners do not light after the second attempt, consult the “Troubleshoo­ting” paragraph.

In case of an electrical power failure while the boiler is working, the burners will go out and re­ignite automatically when power is restored.

28

DOMIcompact F 24 B

Checks during operation

• Check the soundness of the gas circuit and water systems.

• Check the efficiency of the flue and air-flue ducts while the boiler is working.

• Check that the water is circulating properly between the boiler and the systems.

• Make sure that the gas valve modulates correctly in both the heating and hot water production
modes.

• Check for correct ignition of the boiler by performing various tests, turning it on and off with the room
thermostat or remote control.

• Make sure that the gas consumption indicated on the meter corresponds to that given in the technical
data table in chap. 4.(Input rating)

• Check there is the correct flow rate of hot water with the Δt stated in the technical data chart: The
measurement should be made with specific instruments and as close as possible to the boiler, also con­sidering the heat lost from the pipe work.

• Make sure that with no call for heating the burner ignites correctly upon opening a hot water tap. Check
that during heating operation, on opening a hot water tap, the heating pump stops and there is a con­stant production of hot water.

Turning off

Turn the knobs (ref. 1 and 2 Fig. 1) onto minimum.
When the boiler is turned off, the printed circuit board is still powered.

Hot water and heating operations are disabled, the display shows ; but the frost protection mode

remains active..

The frost protection system will not work if the electricity and/or gas supply to the boiler are
cut off.
To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the boiler, both tap 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.

3.3 Maintenance

The following operations must only be carried out by suitably trained and Qualified Personnel,
such as Ferroli service engineers.

Seasonal inspection of the boiler and flue

It is advisable to carry out the following checks at least once a year:

• The control and safety devices (gas valve, flow switch, thermostats, etc.) must function correctly.

• The air-flue terminal and ducts must be free of obstructions and leaks.

• The gas and water systems must be sound.

• The burner and exchanger must be clean. Follow the instructions in the next paragraph.

• The electrode must be free of debris and correctly positioned.

• The water pressure in the cold water system must be approximately 1 bar; otherwise, bring it to that
value.

• The expansion tank must be filled with air @ 1bar.

• The gas flow and pressure must correspond to that given in the respective tables.

• The circulation pump must be manually spun, vented and not be restricted.

• The condensate discharge must be clean, free of obstructions, leaks and clean out the sediment inspec­tion bowl.

Opening the casing

To open the boiler casing:

1 Unscrew the two screws A
2 Lower the instrument panel
3 Drop down the instrument panel
4 Fully unscrew the two screws B
5 Raise and remove the casing C

29

DOMIcompact F 24 B

Before carrying out any operation inside the boiler, disconnect the electrical power and isolate
the gas supply.

Fig. 16b

A

A

Fig. 16a

B

B

C

Fig. 16c

Fig. 16d

Cleaning the boiler and burner

The body and burner must not be cleaned with chemical products or wire brushes. Special care must be
taken over all the seals pertaining to the sealed chamber (gaskets, cable clamps, etc.).

After performing all these operations, check and carry out all the phases of ignition and thermostat
operation, the gas valve and circulation pump.

After these checks, make sure there are no gas leaks.

Combustion analyser testing

It is possible to analyse the combustion through the air and flue sampling points shown in fig. 17.
To make the measurement, it is necessary to:

1) Open the flue sampling point

2) Insert the probe;

3) Turn on the hot water tap;

4) Turn the domestic hot water stat

to maximum;

5) Allow the boiler to reach thermal
equilibrium (10 - 15 min.);

6) Wait 10 minutes for the boiler
to stabilise

7) Take the measurement.(see the
data table)

Flue

Flue

Air

Air

fig. 17

30

DOMIcompact F 24 B

 No gas

 Detection or ignition

electrode fault

 Defective gas valve

 Ignition power too low

 Condensate discharge

full or dirty

Safety thermostat trips  Heating sensor damaged

 No water circulation in

the system

 Air in the system

Air pressure switch

(fails to close the contacts

within 60 sec. of turning

on the fan)

 Air pressure switch

contact open

 Incorrect wiring to the

air pressure switch

 Incorrect restrictor ring

fitted

 Flue not correctly sized

or obstructed

Fault

No burner ignition

Possible cause

Low system pressure  System empty

 Low Water pressure switch

not connected or damaged

Cure

Flame present with

burner off signal

 Electrode fault

 PCB fault

Delivery sensor fault  Sensor damaged

 Wiring shorted

 Wiring broken

Tap water sensor fault  Sensor damaged

 Wiring shorted

 Wiring broken

 Check the regular gas flow to the

boiler and the air has been purged

from the pipes.

 Check the wiring of the electrode

and that it is correctly positioned and

free of any deposits

 Check and change the gas valve

 Adjust the ignition power

 Check and clean condensate discharge

 Check the correct positioning and

operation of the heating sensor

 Check the circulator

 Vent the system

 Check the system bypass is sufficient

 Check the wiring to the fan
 Check the pressure switch
 Change the restrictor ring
 Check the fan venturi

 Check the wiring or change

the sensor

 Fill the system to 1 - 1,5 bar

 Check the low water pressure switch

 Check the wiring or change

the sensor

Display code

F1

F3

F2

F5

F37

F7

F9

 Check the ionizing electrode wiring

 Check the card

3.4 Troubleshooting

Fault Diagnosis

The boiler is equipped with an advanced self-diagnosis system. In the event of a fault within the boiler,
the display will show the relevant code.

There are faults that cause shutdown (faults from F1 to F3): in order to restore operation it requires the
operator to press RESET for 1 second (ref. 2 - Fig. 1) if the boiler fails to start, it will be necessary to
resolve the fault indicated on the display.

Other faults (from F5 to F37) cause temporary shutdowns that are automatically reset as soon as the
value comes back within the boiler’s normal working range.

31

DOMIcompact F 24 B

4 TECHNICAL CHARACTERISTICS AND DATA

4.1 Dimensions and connections

Fig. 18

Top view

Bottom view

Key

1 Heating system Flow Ø 3/4” (22mm with isolation valve fitted)
2 Hot water outlet Ø 1/2” (15mm with isolation valve fitted)
3 Gas inlet 1/2” (22mm with isolation valve fitted)
4 Tap water inlet Ø 1/2” (15mm with isolation valve fitted)
5 Heating system return Ø 3/4” (22mm with isolation valve fitted)
6 Condense outlet Ø 3/4” (flexible connection supplied)

149

460

706

681

266

97

36 95 60 60 95 114

1 2 3 5

86

120

254

266

98

6 4

32

DOMIcompact F 24 B

4.2 General view and main components

fig. 19

Key

5 Combustion chamber
7 Gas inlet
8 DHW outlet
9 Cold water inlet
10 CH flow
11 CH return
14 Safety valve
16 Fan
19 Combustion chamber
21 Gas injector manifold
22 Burner assembly

26 Combustion chamber

insulation

27 Copper heat exchanger for

c.h. + d.h.w.

32 Heating pump
34 Heating flow sensor
36 Automatic air vent

42 D.h.w. temperature sensor
43 Air pressure switch

44 Gas valve
49 Safety thermostat
56 Expansion vessel

81 Spark ele c trode
114 Low Water pressure switch
126 Flue gas safety thermostat
132 Flue gas deflector

136 Flow switch
154 Condense outlet
193 Condensate Siphon
277 Secondary heat exchanger

32

56

132

27

19

26

81

16

43

5

49

34

10 8 7 9 11

22

21

42

14

114

44 136

277

193 154

126

36

33

DOMIcompact F 24 B

4.3 Hydraulic diagram

Fig. 20

Key
5 Combustion chamber
7 Gas inlet
8 DHW outlet
9 Cold main inlet
10 CH flow
11 CH return
14 Heating safety valve
16 Fan
27 Heat exchanger
32 Heating pump
34 Flow temperature sensor

38 Flow switch
42 D.h.w. temperature sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
56 Expansion vessel

81 Spark electrode
114 Low Water pressure switch
126 Flue gas safety thermostat
277 Secondary heat exchanger

117

9

27

10

8

56

81

32

49

5

38

42

34

43

16

P1

P2

44

277

126

114

14

34

DOMIcompact F 24 B

4.4 Technical data table

Heating

Heating temperature adjustment range °C
Maximum working temperature in heating °C

Heating circuit PMS safety valve (preset) bar
Minimum working pressure in heating bar
Expansion vessel capacity litres

Expansion vessel pre-filling pressure bar
Total boiler water content litres

Hot water

Hot tap water supply Dt 25° C l/min

Hot tap water supply Dt 30° C l/min
Hot tap water supply Dt 35° C l/min
Tap water temperature adjustment range °C
Maximum working pressure in hot water production bar
Minimum working pressure in hot water production bar

Dimensions, weights connections

Height mm
Width mm
Depth mm
Weight with packing kg
Gas system connection mm
Heating system connections mm
Hot water circuit connections mm

Maximum length of separate flues D=80*

m

eq

(*Measurement given in equivalent linear metres  cfr FERROLI calculation system)

Electrical power supply

Max electrical power absorbed W

30 - 85

90

3

0.8
8

1

2,0

13,8

11,5

9,8

40 - 55

9

0.25

681
460
266

38
1/2
3/4
1/2

55

135

Powers

Hi Heating power

Pmax Pmin

kW 25,5 10,3

Useful Heating Power 80° C - 60° C
Useful Heating Power 50° C - 30° C

kW 25,0 10,8

kW 24,1 9,9

Table 10

Protection level

IP X5D

Gas supply

Natural Gas delivery (G20)

Natural Gas main injectors (G20)

Pressure at Natural Gas burner (G20)

Natural Gas supply pressure (G20)

LPG delivery (G31)

LPG main injectors (G31)

Pressure at LPG burner (G31)

LPG supply pressure (G31)

mm 12 x 1,30
mbar 20,0
mbar 11,8 2,5

nm

3

/h 2,65 1,14

mm 12 x 0,77
mbar 37,0
mbar 35,0 7,5

kg/h 1,96 0,84

Efficiency

Seasonal Efficiency (SEDBUK)

87,7 %
88,7 %

Natural gas

LPG

35

DOMIcompact F 24 B

4.5 Diagrams

Head available for the system

Fig. 21

0

0

1

2

3

4

5

6

7

500 1.000 1.500 2.000

Q [l/h]

H [m H

2

O]

3

2

1

A

= Pump speed

321

A

= Pressure loss through boiler

36

DOMIcompact F 24 B

4.6 Time Clock

A 24 hour time clock is fitted to the boiler to control the central heating, this will come into operation
when the selector switch “F“ is turned to the position marked “AUTO”.

AUTO

+

-

R

OVER RIDE

x

x

A

B

E

RDP

AUTO

P

OI

F

P

A Slide switch: set clock - auto - set programme
B Display. Symbol in Display = Timer ON

P Select programme ON/OFF 1.....8

D Push buttons Time + Time

-

E Override: Boiler will switch ON if it is OFF; and OFF if it is ON
F I=Heating continuous - AUTO=Heating timed - O=Heating disabled
R Reset (with pencil) only with switch A in set clock position

1.1 Use buttons + and - to set 1st ON time eg. 6:00

Display

2.1 Use buttons + and - to set OFF time, eg. 9:00

Display

3.1 Use button + and - to set 2nd ON time, eg. 12:30

Display

4.1 Use button + and - to set 2nd OFF time eg. 14:00

Display

5.1 Use button + and - to set 3rd ON time, eg. 16:00

Display

6.1 Use button + and - to set 3rd OFF time eg. 23:30

Display

8. On completion of programming slide switch (A) to
Auto position, the time of day will be displayed and
the central heating will switch ON and OFF according
to the programme set.

1. Slide switch (A) to right position (P)

Display

2. Press button (P)

Display

3. Press button (P)

Display

4. Press button (P)

Display

5. Press button (P)

Display

6. Press button (P)

Display

7. The timer can be programmed with up to 8 ON and
8 OFF times by repeating the above procedure.

6:30

1

8:30

2

12:00

3

12:00

4

6:00

1

9:00

2

12:30

3

14:00

4

16:30

5

22:30

6

16:00

5

23:30

6

Over ride

By pressing the over ride button (E) the timer programme is over ridden ie, if programme is in OFF time it will
come ON and if in ON time will go OFF.
The timer will revert back to it set programme on reaching the next ON or OFF time.
When the programme is on over ride the sign will be shown in the display window (B).

Reset Button

By the use of a pencil the reset button can be pushed (R). This will clear all programmes apart from those factory
pre set.

Reset is only possible with switch (A) in set Clock position!

To set time of day

1. Slide switch (A) to left position

2. Using button + and

-

adjust until the correct time is shown on display (B).

Pre Set Programmes. The timer is pre programmed with 3 ON and 3 OFF times.

6:30 - 8:30
12:00 - 12:00
16:30 - 22:30

If these are suitable no programming is required and the slide switch (A) can be moved to the
Auto position and the central heating will be ON for these periods.
(12:00 - 12:00 will not switch on the boiler)

To Set Own ON and OFF times. Symbol in Display = ON time

37

DOMIcompact F 24 B

4.7 Wiring diagram

Fig. 22

Key

16 Fan

32 Heating circulator

34 Heating temp. sensor

38 Flow switch

42 Tap water temperature sensor

43 Air pressure switch

44 Gas valve

47 Modureg

49 Safety thermostat

72 Room thermostat

81 Ignition/detection electrode

114 Water pressure switch

126 Flue gas safety thermostat

139 Remote timer control (opentherm)

34

43

49

MF08FA.1

TRANSFORMER

42

114

441632

230V 50Hz

X5 X3 X7

X6 X4

1 2 123 1 23 4 123456712345678910 11

FUSE

FUSE

X1

N L

81

47

38

F 3.15A

F 3.15A

72

139

126

Condensate

discharge

full

CAUTION

Before connecting the voltage free room thermostat

or remote timer control, remove the jumper on the

terminal block.

BENCHMARK

CONTROLS To comply with the Building Regulations, each section must have a tick in one or other of the boxes

TIME & TEMPERATURE CONTROLTO HEATING ROOM T/STAT & PROGRAMMER/TIMER PROGRAMMABLE ROOMSTAT

TIME & TEMPERATURE CONTROL TO HOT WATER CYLINDER T/STAT & PROGRAMMER/TIMER

COMBI BOILER

HEATING ZONE VALVES FITTED NOT REQUIRED

HOT WATER ZONE VALVES FITTED NOT REQUIRED

THERMOSTATIC RADIATOR VALVES FITTED

AUTOMATIC BYPASS TO SYSTEM FITTED NOT REQUIRED

FOR ALL BOILERS CONFIRM THE FOLLOWING

THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE BOILER MANUFACTURER’S INSTRUCTIONS?

THE SYSTEM CLEANER USED

THE INHIBITOR USED

FOR THE CENTRAL HEATING MODE, MEASURE & RECORD

GAS RATE ft3/hr

BURNER OPERATING PRESSURE (IF APPLICABLE) mbar

CENTRAL HEATING FLOW TEMPERATURE °C

CENTRAL HEATING RETURN TEMPERATURE °C

FOR COMBINATION BOILERS ONLY

HAS A WATER SCALE REDUCER BEEN FITTED? YES NO

WHAT TYPE OF SCALE REDUCER HAS BEEN FITTED?

FOR THE DOMESTIC HOT WATER MODE, MEASURE & RECORD

GAS RATE ft3/hr

MAXIMUM BURNER OPERATING PRESSURE (IF APPLICABLE) mbar

COLD WATER INLET TEMPERATURE °C

HOT WATER OUTLET TEMPERATURE °C

WATER FLOW RATE

lts/min

FOR CONDENSING BOILERS ONLY CONFIRM THE FOLLOWING

THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS? YES

FOR ALL INSTALLATIONS CONFIRM THE FOLLOWING

THE HEATING AND HOT WATER SYSTEM COMPLIES
WITH CURRENT BUILDING REGULATIONS

THE APPLIANCE AND ASSOCIATED EQUIPMENT HAS BEEN INSTALLED AND COMMISSIONED
IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS

IF REQUIRED BY THE MANUFACTURER, HAVE YOU RECORDED A CO/CO2 RATIO READING? N/A YES CO/CO2 RATIO

THE OPERATION OF THE APPLIANCE AND SYSTEM
CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER

THE MANUFACTURER’S LITERATURE HAS BEEN LEFT WITH THE CUSTOMER

m3/hr

m

3

/hr

COMMISSIONING ENG’S NAME PRINT CORGI ID No.

SIGN DATE

BOILER SERIAL No. NOTIFICATION No.

BENCHMARK No.

GAS BOILER COMMISSIONING CHECKLIST

COLLECTIVE MARK

N/A

N/A

267

Please add the first 4 digits of the Boiler serial No to complete the BENCHMARK No.

SERVICE INTERVAL RECORD

It is recommended that your heating system is serviced regularly

and that you complete the appropriate Service Interval Record Below.

Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service

as described in the boiler manufacturer’s instructions. Always use the manufacturer’s specified spare part when replacing all controls

SERVICE 1

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 2

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 3

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 4

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 5

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 6

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 7

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 8

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNA

TURE

SERVICE 9

DATE

ENGINEER NAME

COMP

ANY NAME

TEL

No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 10

DATE

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

FERROLI TECHNICAL HELPLINE - 08707 282 885

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.

Lichfield Road, Branston Industrial Estate, Burton Upon Trent, Staffordshire DE14 3HD

Tel. [phone] - Fax [phone]

EIRE only:

HEATOVENT Greenhills Industrial Estate,

Greenhills Road, Walkinstown, Dublin 12, IRELAND

Tel [phone] - Fax [phone]

Should you require any assistance during the installation

call our Technical Service Helpline on

08707 282 885 option 1

Should you require a service engineer to visit

call our service centre on

08707 282 885 option 2

(For U.K. and Northern Ireland)

For EIRE only call HEATOVENT on

014508166