Ferroli DOMIcompact F 24 B Parts list manual

wall-mounted gas fired,
condensing combination boiler
FERROLI F 24 B
cod. 3540B29/1 - 04/2005
Seasonal Efficiency
(SEDBUK)
band B
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE

2
Ferroli 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.
• 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, 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 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 symbols 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
Ferroli F 24 B
1. OPERATING INSTRUCTIONS..................................................................4
1.1 Introduction ............................................................................................................4
1.2 Control panel ..........................................................................................................5
1.3 Operating instructions............................................................................................6
1.4 Adjustments ............................................................................................................6
1.5 Maintenance............................................................................................................7
1.6 Faults.......................................................................................................................7
1.7 Time Clock ..............................................................................................................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 .............................................................................22
3. SERVICE AND MAINTENANCE............................................................24
3.1 Adjustments ..........................................................................................................24
3.2 Initial start-up........................................................................................................26
3.3 Maintenance..........................................................................................................27
3.4 Troubleshooting....................................................................................................29
4 TECHNICAL CHARACTERISTICS AND DATA.........................................33
4.1 Dimensions and connections ................................................................................33
4.2 General view and main components ....................................................................34
4.3 Hydraulic diagram.................................................................................................35
4.4 Technical data table..............................................................................................36
4.5 Diagrams ...............................................................................................................37
4.6 Wiring diagram .....................................................................................................38
Benchmark................................................................................................40

4
Ferroli F 24 B
1. OPERATING INSTRUCTIONS
1.1 Introduction
Dear Customer,
Thank you for choosing FERROLI 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.
FERROLI F 24 B is a high-efficiency condensing appliance for heating and hot water production run-
ning 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 needed for combustion is drawn
from outside. The boiler also includes a fan, modulating gas valve, pump, expansion vessel, flow meter,
safety valve, flow sensor, temperature sensors, a safety thermostat and a low pressure sensor.
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 according to the indoor characteristics of the building and its location. 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, 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.

5
Ferroli F 24 B
Fig. 1
1.2 Control panel
The boiler is designed for use with two types of gas: natural gas NG or propane (LPG). The type of
gas can be selected when purchasing the boiler or the appliance can be converted later on site by a
competent person. It operates with technologically advanced systems such as electronic control, safety
and control devices.
The boiler is fitted with automatic electronic ignition so there is no pilot to worry about.
Pull down cover to reveal control facia panel.
KEY DESCRIPTION
ASwitch OFF/ON/RESET
BCentral heating flow
temperature regulation
CD.H.W. temperature
regulation
DWater pressure gauge
ETime clock
bar
RESET
OFF
ON
0
5
1
234
6
bar
ABC D
°C°C
E
Burner on indicator
Boiler shut down warning
Domestic hot water circuit on
Central heating stand-by (Flashing light)
Central heating circuit on (Permanent light)
Insufficient pressure in central heating system (Flashing light)
Electric power supply (Permanent light)
12345
1
2
3
4
5
LED

6
Ferroli F 24 B
1.3 Operating instructions
Ignition
• Open the gas isolation valve upstream of the boiler.
• Purge the air from the pipe upstream of the gas valve.
• Ensure power is on to appliance.
• Turn the switch A(fig. 1) to the ON position.
• The boiler is now ready to function automatically whenever hot water is drawn or the clock and room
thermostat calls for heating.
Turning off
Turn the switch A(fig. 1) to the OFF position.
When the boiler is turned off with this button, the P.C.B. is no longer powered and the frost
protection will be disable.
Close the gas cock upstream of the boiler and disconnect the electrical power supply.
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.
1.4 Adjustments
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature desired in the room. Controlled by the room thermostat,
the boiler lights and heats the system water to the set system setpoint temperature. The burner shuts
down when the desired temperature in the rooms is reached.
A room thermostat is a mandatory requirment (building regulations Doc “L” 2002).
C.H. temperature adjustment
To set the system flow temperature, use the C.H. control knob B(fig. 1).
Turning it clockwise increases the temperature, turning it anticlockwise
decreases it.
Domestic hot water temperature adjustment
To set the hot water temperature, use the D.H.W. control knob C(fig. 1).
Turning it clockwise increases the temperature, turning it anticlockwise
decreases it.
Hot Water Only - “SUMMER” ( )
To obtain hot water only from the boiler, turn switch (Afig. 1) to the on position. The top green light
on the left side of the control panel is illuminated (power on ).
Turn the temperature regulator (Bfig. 1) to the position. Open a hot water tap, green light (tap
symbol) comes on, fan starts and burner will light. Indicated by flame symbol, green light coming on.
The temperature of the hot water can be adjusted by turning the hot water thermostat (Cfig. 1) clockwise
to increase and anti-clockwise to decrease the water temperature.
°C
60
80
50 70
40
°C

7
Ferroli F 24 B
Heating and Hot Water - "WINTER” ( )
To obtain heating from the boiler, turn the temperature regulator (Bfig. 1) clockwise to the maximum
position, ensure that any other heating controls e.g. room thermostats, clock etc. are in the on posi-
tion.
The boiler may be in heating delay of three minutes as indicated by the red light (egg timer symbol) on
the left of the facia panel. When this light goes out the green light (radiator symbol) will come on. The
fan and pump will run and the burner will light indicated by the green flame symbol light. Adjust the
temperature regulator to the desired setting. (In winter do not run boiler below 50°C). If a hot water
tap is opened whilst the boiler is running for heating the pump will stop, suspending the heating phase
and the boiler will give priority to hot water production. When the tap is closed the boiler will go into
a three minute delay cycle before resuming for heating.
Frost Protection
In cold weather the boiler may appear to run when there is no demand for heating (i.e. clocks or room
thermostats turned off). This is due to the central heating sensor going into frost protection mode.
Once the boiler has reached 14°C or more it will close down until either the temperature again falls
below 7°C or the clock or room thermostat is turned on.
For this reason we recommend that the electricity to the boiler is left turned on. If you wish to turn off
the electricity to the boiler in winter you should drain completely the heating and hot water circuits.
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
Low water pressure
Low pressure will be indicated by flashing light in the middle of the facia illuminating (
bar
).
The boiler pressure gauge (Dfig. 1) should read at least 1 bar.
Boiler lock out
In the event of the red lockout light ( ) coming on, the on/off/reset switch (Afig. 1) should be turned
clockwise against the spring tension to the reset position and released (this will put the boiler into three
minute delay if in the heating mode). Check gas supply or condensate discarge. Clean condensate
discharge if dyirty or obstructed. If the lockout light ( ) illuminates repeatedly, contact an approved
Férroli service engineer.
If the problem remains after two attempts at resetting, contact the Ferroli Service Centre.
For other faults, refer to section 3.4 “Troubleshooting.”
Before calling the Ferroli service centre, check that the problem is not due to an installation
error or a problem with the gas/electricity or low water pressure in the system.

8
Ferroli F 24 B
1.7 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 is turned to the position marked “heating timed and hot water”.
AUTO
+
-
R
OVER RIDE
x
x
A
B
E
RDP
AUTO P
OI
F
P
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
To Set Own ON and OFF times. Symbol in Display = ON time
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)
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 Ain 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!

9
Ferroli 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 hea-
ting 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 COMPEDENT WORKMANSHIP.
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. 7593 TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS
B.S. 5546 INSTALLATION OF HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
Model Water Bye Laws
B.S. 5955-8 PLASTIC PIPEWORK INSTALLATION
For Northern Ireland the rules in force apply

10
Ferroli F 24 B
Minimum
A
B
D
5 cm
20 cm
60 cm
(via an openable panel)
C20 cm
Table 1
fig. 2
2.2 Boiler location
The unit’s combustion circuit 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 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.
Drilling Template (Top Flue Application)
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 standard wall plugs on the left and
right side and the special wall plug in the middle (fig. 3). Fix the wall bracket to the wall using standard
lock nut (M8) on both sides. Mount the boiler on the wall bracket and fix using the special antitheft nut
(M8) as described in the fig. 3. Using a core drill cut a 118mm diameter hole for the flue.
Fig. 3
A A
B
D
C