FERROLI F24
INSTALLATION, SERVICE AND USER
INSTRUCTIONS
G.C. NO: 47-267-23
3544015/0 - 07/2001
Appr. nr. B98.01 A - CE 0063 AT 4967
Copper Wall-Mounted Combination,
Gas Fired Boiler for Central Heating
and Domestic Hot Water Production,
Fan Assisted, Room Sealed Compartment,
Electronic Flame Ignition and Control
FERROLI F24
IMPORTANT
Your "benchmark" Installation, Commissioning and Service Record Log Book will be enclosed
in your customer information pack.
"This record must be completed and left with the end user"
"All CORGI Registered Installers carry a CORGI ID card and have a registration number. Both
should be recorded in your central heating log book. You can check to the CORGI registered
by calling CORGI on 01256 372300".
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.
CE MARK
CE mark documents that the Ferroli gas appliances comply with the requirement contained in
European directives applicable to them.
In particular, the appliances comply with the following CEE directives and the technical specifications
provided from them:
• Gas appliances directive 90/396
• Efficiencies directive 92/42
• Low tension directive 73/23 (modified from the 93/68)
• Electromagnetic compatibility directive 89/396 (modified from the 93/68)
Year 2000 Compliance Declaration
We will guarantee that this products is altogether suitable for the data change in the Year
2000 (boiler has no dependence from date change) and that no disruptions will occur which is
caused by this product.
INDE 1
1. DESCRIPTION........................................................................................................................................ 3
2. TECHNICAL AND DIMENSIONAL CHARACTERISTICS........................................................................................ 4
3. INSTALLATION DETAILS ........................................................................................................................................ 9
4. COMMISSIONING AND TESTING.......................................................................................................................26
5. ADJUSTMENT AND GAS CONVERSION ............................................................................................................27
6. MAINTENANCE AND CLEANING ......................................................................................................................29
7. REPLACEMENT OF PARTS...................................................................................................................................31
8. FAULT FINDING ...................................................................................................................................................36
9. ELECTRICAL AND FUNCTIONAL SCHEME ........................................................................................................46
10. USER INSTRUCTIONS ........................................................................................................................................45
2
FERROLI F24
1. DESCRIPTION
1.01 Introduction
The Ferroli F24 is defined as a “room sealed” combination boiler, all air required for combustion is taken from
outside the room in which it is installed. It is a new high performance gas fired heat generator for central heating and
domestic hot water production. A special feature of this boiler is its built-in electronic flame ignition and control unit
making burner operation completely automatic and safe. The main components are as follows:
• Copper heat exchanger consisting of three finned tubes specifically shaped for high efficiency.
• There are three copper coils inserted in the three heating circuit tubes. These represent the domestic
hot water heat exchanger. Their shape and high exchange surface area enable the full output of the
boiler to be absorbed.
• Ceramic fibre insulated combustion chamber
• 12 stainless steel bladed burners specifically designed for this boiler.
• Fan for discharge of combustion products and intake of combustion air.
• Differential air pressure switch. For safety reasons, this ensures the burner ignites only when the fan is functioning
correctly.
• Hermetically sealed compartment made from corrosion-resistant steel enclosing the above components.
• Combination gas safety valve with modulator, complete with pressure stabiliser.
• Flowmeter giving the domestic hot water circuit precedence over the central heating circuit.
• Pressure relief valve for the central heating circuit set to open at 3 bar.
• Built-in Expansion vessel.
• Variable speed pump.
• Central heating flow temperature adjustment thermostat.
• Domestic hot water flow temperature adjustment thermostat.
• Central heating limit thermostat.
• Overheat safety thermostat.
• Electronic control unit for automatic flame ignition and control.
• Central heating low water pressure cut off switch.
• Domestic hot water flow temperature sensor.
• Central heating flow temperature sensor.
1.02 Instructions and regulations
Assembly, installation, first start up and maintenance must be carried out by competent persons only, in accordance
with all current technical regulations and directives.
C.O.S.H.H.
Materials used in the manufacture of this appliance are non hazardous and no special precautions are
required when servicing.
Related Documents
This appliance must be installed strictly in accordance with these instructions.
The Gas Safety Regulations (Installations & Use) 1996.
The Local Building Regulations.
The Building Regulations.
The Buildings Standards (Scotland - Consolidated) Regulations.
British Standards Codes of Practice:
B.S.
B.S.
B.S.
B.S.
B.S.
B.S.
B.S.
B.S.
B.S.
B.S.
7593
5546
5440
5440
5449
6798
6891
7671
4814
5482
1992
1990
Part 1 2000
Part 2 1989
1990
1987
1989
1992
1990
1994
TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS
INSTALLATION OF HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
FLUES
AIR SUPPLY
FORCED CIRCULATION HOT WATER SYSTEMS
INSTALLATION OF GAS FIRED HOT WATER BOILERS
GAS INSTALLATIONS
IEE WIRING REGULATIONS
SPECIFICATION FOR EXPANSION VESSELS
INSTALLATION OF LPG
Model Water Bye Laws
For Northern Ireland the rules in force apply
3
FERROLI F24
2. TECHNICAL AND DIMENSIONAL CHARACTERISTICS
2.01 Technical information
Ferroli F24 boilers are central heating and domestic hot water heat generators and are produced as
standard to function with natural gas or Liquid Petrolium Gas converted appliances.
460
150
25
160
249
178
100 25
270
727
272
760
190
100
Distance between connections
95
60
60
95
114
70
120
120
150
98
110
36
80
84
80
Fig. 1
Top view
1
Key
1
2
3
4
Bottom view
- 3/4" central heating flow outlet
2 - 1/2" domestic hot water flow outlet
3 - 1/2 “ gas inlet
4
5
4 - 1/2" domestic hot water inlet
5 - 3/4" central heating return inlet
6 - Pressure relief outlet
FERROLI F24
Technical Data
Heat output
MODEL
Ferroli F24
Heat input
kW
kW
kW
Litres
Litres
23,8
9,7
25,8
11,5
23,8
1,5
0,8
2
3
4
5
Ø
Ø
Ø
Ø
Ø
Litres
bar
bar
bar
3/4”
1/2”
1/2”
1/2”
3/4”
7
1
3
6
Gas flow rates to main burners
for central heating
G20 - NG G31 -LPG
Ø
Ø
12x1,30
12x0,77
G20 - NG
m3/h
2,73
Gas supply pressures
working
MODEL
Ferroli F24
G20
G31
mbar
20
mbar
37
Domestic hot
water production
with ∆t 30 °C
Gas valve
Ø1/2
G31 -LPG
kg/h
2,00
H. V K4105G
Gas pressure at main burner for central heating
MODEL
Ferroli F24
Max. working
Max.
pressure
working
central
pressure hot
heating
water circuit
circuit
Pre-pressurising
Capacity
value
Expansion vessel
1
Main injectors (mm)
Ferroli F24
Domestic hot
water contents
kW
MODEL
MODEL
Boiler water
contents
kW
Connections
Ferroli F24
Domestic hot
water heat
input
G20
min.
mbar
2,5
Domestic hot
water production
with ∆t 35 °C
Safety valve
G31
m
mbar
11,8
min.
mbar
7,8
Max. working
pressure domestic
hot water
l/min.
l/min.
G20
mbar
11,3
9,7
11,8
G31
mbar
36,0
m
mbar
36,0
Protection
level
bar
Weight
kg
IP44
38
N.B. - The gas pressures at the burner and gas flows during the central heating phase given in the table refer
to nominal boiler output. To reduce this output (where necessary), gas pressure must be reduced until the
required output level is reached (see figures 4 and 5).
During domestic hot water production, gas pressures to the burner must correspond to the maximum
output given in table for the type of gas.
Gas pressure must be adjusted during maximum draw-off of domestic hot water.
• Maximum working temperature for central heating flow: 85°C
• Maximum temperature of domestic hot water: 55°C, adjustable between 40°C and 55°C.
• Minimum domestic cold water pressure required for 95% heat input:
- Flow restrictor fitted (standard) - 1,2 bar;
- Flow restrictor removed - 0,5 bar
5
FERROLI F24
2.02 Boiler main components
2.03 Boiler water flow diagram
FLUE
OUT
AIR
AIR
IN
IN
43
5
56
28
16
90
91
132
27
49
50
19
22
82
26
81
20
21
OUT
36
MIN
IN
32
MIN
IN
OUT
114
34
10
14
136
8 42 84 7 85 44 9
ON
11
2
3
4
T
SE
OF
RE
F
bar
1
5
0
°C
Fig.
Key
5
7
8
9
10
11
14
16
19
20
21
22
26
27
28
32
34
36
42
6
2
98
6
Fig. 3
°C
63
157
145
C.H.
OUT
62
Room sealed compartment
Gas nlet
Domest c hot water outlet
Domest c hot water nlet
Central heat n flow outlet
Central heat n return nlet
Safety valve
an
Combust on chamber
Burner assembly
Ma n njector
Burner
Combust on chamber nsulat on
Copper heat exchan er for central heat n and
domest c hot water
lue collector from heat exchan er
Central heat n pump
Central heat n flow temperature sensor
Automat c a r vent valve
Domest c hot water flow
temperature sensor
i
i
i
i
i
g
i
g
i
F
i
i
i
i
i
i
g
i
i
F
g
i
i
i
g
i
g
i
g
D.H.W. GAS D.H.W.
OUT IN
IN
43
44
49
50
56
62
63
81
82
84
85
90*
91*
98
114
132
136
145
157
C.H.
IN
A r pressure sw tch
Gas valve
Safety overheat thermostat
Central heat n flow l m t thermostat
Expans on vessel
me cloc opt on
Central heat n temperature adjustment
n t on electrode
Sensor electrode
Pr mary as valve soleno d
Secondary as valve soleno d
lue sampl n po nt
A r sampl n po nt
On/Off/Reset sw tch
Low water pressure cut off sw tch
lue as deflector
low meter
Central heat n pressure au e
Domest c hot water temperature adjustment
i
i
i
g
i
g
i
i
i
Ti
k (
Ig
i
)
i i
i
g
i
g
F
i
i
i
i
g
i
g
i
i
i
F
g
F
i
g
g
g
i
* For use with flue gas analysis equipment
FERROLI F24
2.04 Central heating adjustment (not normally required)
To adjust boiler heat input (thus also regulating heat output to the central heating water) simply adjust the main
burner via the electronic control board (fig. 4 and 5 and see paragraph 5.04 page 29).
The diagrams indicate the variation in heat output to the water as burner working pressure is varied.
Adjusting boiler output to the actual requirements of the central heating system will minimise boiler
cycling thus saving fuel, varying the output has virtually no effect on the efficiency and combustion
characteristics of the boiler.
Diagram of pressures and outputs
with LPG (Propane)
Diagram of pressures
and outputs with Natural gas
35
14
13
30
12
11
25
mbar
10
mbar
9
8
20
7
15
6
5
4
10
3
2
kW
kcal/h 8
x 1000
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
9
5
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
kW
kcal/h 8 9 10 11 12 13 14 15 16 17 18 19 20
X 1000
10 11 12 13 14 15 16 17 18 19 20 21
Fig.
Fig. 4
5
Diagram of domestic hot water production
Fig.
6
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
65
Temperature of domestic hot water supply °C
The temperature of the domestic hot water can
be varied from 40 to 55°C by adjusting the boiler
potentiometer.
60
55
50
45
40
39
Temperature of domestic hot water intake 15°C
0
3
4
5
6
7
8
9
10
11
12
13
14
15
Boiler output exchanged kcal/1000
2.05 Domestic hot water variability characteristics
16
Flow of domestic hot water l/min
7
FERROLI F24
2.06 Pump characteristics
The pump head available for circulating the water is given
in fig. 7.
N.B. - The pump is factory set at position 3. The pump is a
Grundfos type 15-50 UPS series.
Grundfos Pump per formance graph
Note - Minimum flow through boiler heat exchanger at any
time should not fall below 6 litres per minute.
If the total volume of water in the system exceeds 40 litres
an additional expansion vessel must be fitted to the central
heating return pipe.
1
A
B
2
3
Speed settings
Boilers pressure drop
Available pump head C.H.
Fig.
SIZING OF ADDITIONAL EXPANSION VESSELS:
Deduct from the value given in the table the 8 litre
vessel supplied.
Note:
1.
Fill C.H. installation to min. 1.5 bar.
2.
Expansion vessel must be fitted to central
heating return pipe.
3.
The standard 7 litre expansion vessel is
charged to 1 bar.
4.
The additional expansion vessel should be
charged to 1 bar.
7
SAFETY VALVE
SETTING (bar)
Pressure loss diagram
mbar x 100
0.5
1.0
1.0
TOTAL WATER
CONTENT of SYSTEM
EXPANSION VESSEL VOLUME (litres)
LITRES
25
50
75
100
125
150
175
200
1.5
2.0
4.7
9.5
14.2
19.0
23.7
28.5
33.2
38.0
10.3
20.6
30.9
41.2
51.5
61.8
72.1
82.4
8.3
16.5
24.8
33.1
41.3
49.6
57.9
66.2
0.140
0.259
0.551
0.190
0.412
0.33
5
4
3
2
1
Q
8
1.5
2
2.5
2.0
13.7
27.5
41.3
55.1
68.9
82.6
96.4
110.2
6
1
2.0
6.5
12.9
19.4
25.9
32.4
38.8
45.3
51.8
7
0.5
1.5
3.5
7.0
10.5
14.0
17.5
21.0
24.5
28.0
8
0
1.5
INITIAL SYSTEM
PRESSURE (bar)
For syst. volumes other than
those given above, mult. the syst.
volume by the factor across
H
3.0
VESSEL CHARGE
PRESSURE (bar)
3
m |h
Fig.
8
FERROLI F24
3. INSTALLATION DETAILS
Gas Safety (Installation & Use) Regulations: 1996
In the interest of safety, it is the law that all gas appliances are installed by a competent person in accordance
with the above Regulations, Building Regulations/Building Standards Scotland, Codes of Practice, current I.E.E.
Regulations and the byelaws of the Local Water Undertaking. Failure to comply with the Regulations may lead to
prosecution; it is your responsibility to ensure that the law is complied with.
N.B. For Northern Ireland the rules in force apply.
Important - If the boiler is to be fitted in a timber framed building it should be fitted in accordance with the Institute of
Gas Engineers document IGE/UP/7. If in doubt advice should be sought from the Local Supplier.
Location of Boiler
The installation of the Ferroli F24 must be on a suitable non-combustible load bearing wall which will provide
an adequate fixing for the boiler mounting bracket assembly. The location should be in an area where
the water pipes will not be subjected to frost conditions. In siting the combination boiler the following
limitations must be observed:
The combination boiler may be installed in any room or internal space, although particular attention is drawn
to the requirements of the current I.E.E. wiring regulations and in Scotland the electrical provisions of the
building regulations applicable in Scotland, with respect to the installation of the combination boiler in a room
or internal space containing a bath or shower.
Where a room sealed appliance is installed in a room containing a bath or shower any electrical switch
or appliance control utilising mains electricity must be situated so that it cannot be touched by a person
using the bath or shower.
Air Supply
The room or compartment in which the boiler is installed does not require a purpose provided vent when
using the standard concentric flue.
Flue System
The boiler allows the flue outlet to be taken from the rear of the boiler, from either side or vertically.
A standard flue length of 0.75 metres is provided. Alternative lengths of two or three metres can be supplied
(equivalent to wall thicknesses of up to 565, 1815 and 2815mm for rear flues, deduct 91mm plus distance from side
wall for side outlet flues). It is absolutely essential, to ensure that products of combustion discharging from the
terminal cannot re-enter the building, or enter any adjacent building, through ventilations, windows, doors,
natural air infiltration or forced ventilation/air conditioning.
Gas Supply
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 without 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 BS6891-1988.
Appliance inlet working pressure must be 20mbar MINIMUM, for NG and 37 mbar minimum for LPG.
Pipework from the meter to the combination boiler must be of an adequate size.
The boiler requires 2.73m3/h of natural gas, and 2,00 kg/h of LPG.
Do not use pipes of a smaller size than the combination boiler inlet gas connection.
The complete installation must be tested for gas soundness and purged as described in BS6981-1988. All pipework
must be adequately supported. An isolating gas valve is provided and should be fitted on the boiler gas inlet.
Please wait 10 minutes when lighting from cold before checking gas rate. Gas pressures should be checked after
the boiler has operated for 10 minutes to reach thermal equilibrium.
Water System
Note - the boiler is designed for sealed systems only and must NOT be used on open vented systems.
9
FERROLI F24
Central Heating
Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipework not forming part of
the useful heating surface should be insulated to prevent any heat losses or possible freezing (i.e. in roof spaces
or ventilated underfloor spaces). Drain taps should be positioned at the lowest point of the system in accessible
locations to permit the whole system to be drained down. The drain taps should be in accordance with
BS2879. Copper tubing to BS2871, Part 1 is recommended for water carrying pipework. Pipework in
horizontal runs should have a gradient where possible to facilitate the removal of air. Ensure that the
boiler heat exchanger is not a natural point for air collection. A typical heating system with domestic
hot water circuit is illustrated in fig. 9.
Important - If thermostatic radiator vales are fitted a bypass must be fitted to ensure a minimum flow rate through
the boiler of 6 l/min. The bypass should be fitted as far as possible from the boiler.
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.
A typical temporary filling loop is shown in fig. 10.
Domestic Hot Water
Always fit a scale reducer in "hard water areas" (18 clarke degrees or over)". A 15mm copper connection point
on the boiler for attaching to the main supply is provided. The maximum domestic water pressure for the
inlet supply is 10 bar (145 P.S.I.). If the cold mains supply exceeds 5 bar (72 P.S.I.), a water governor
or pressure reducing valve must be fitted by the installer into the mains supply in an inconspicuous but
accessible position preferable between 3 and 5 metres (10-16ft) before the appliance. Such a valve must
be approved by the Water Research Council.
Attention - is drawn to the Model 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
Gas
NOTE: A bypass that will ensure a minimum flow rate of
6 l/min. at all all time must be fitted as far as possible
from the boiler if thermostatic radiator valves are fitted
Cold water
thoughout.
Additional expansion
vessel C.H.
Filling
point C.H.
Bypass
Fig. 9
Key
1.
ll n po nt C H
Fi i
g
i
.
.
2. Temporary connection
3. Cold water supply
10
Fig.
10
FERROLI F24
5 min.
460
5 min.
272
50 mm
100 min.
CLEARANCES:
* 600mm minimum clearance for servicing
access
Fig.
760
600* min.
200 min.
900
Top clearance only applies to 100Ø concentric
flue system
11
Terminal Position
Q
l
Q
Q
P
F
D, E
N
B
C
L
G
M
J
N
H
A
M
H
K
Minimum dimensions of flue terminal positions
Dimensions
Aa
Ba
Ca
Terminal position
(kW input expressed in net)
Directly below an opening, air brick, (0-7 kW)
opening windows, etc.
(>7-14 kW)
(>14-32 kW)
(>32-70 kW)
Above an opening, air brick, (0-7 kW)
opening windows, etc.
(>7-14 kW)
(>14-32 kW)
(>32-70 kW)
Horizontally to an opening, air brick, (0-7 kW)
opening windows, etc.
(>7-14 kW)
(>14-32 kW)
(>32-70 kW)
Balanced flues room
sealed
Natural
draught
300 mm
600 mm
1500 mm
2000 mm
300 mm
300 mm
300 mm
600 mm
300 mm
400 mm
600 mm
600 mm
Fanned
draught
300 mm
Open flues
Natural
draught
Not allowed
Fanned
draught
300 mm
Fig.
300 mm
Not allowed
300 mm
300 mm
Not allowed
300 mm
D
Below gutters, soil pipes or drain pipes
300 mm
75 mm
Not allowed
75 mm
E
Below eaves
300 mm
200 mm
Not allowed
200 mm
F
Below balconies or car port roof
600 mm
200 mm
Not allowed
200 mm
G
From a vertical drain pipe or soil pipe
300 mm
150 mmb
Not allowed
150 mm
H
From an internal or external corner
600 mm
300 mm
Not allowed
200 mm
I
Above ground roof or balcony level
300 mm
300 mm
Not allowed
J
From a surface facing the terminal
(also see 6.1.2)
600 mm
600 mm
N/A
600 mm
K
From a terminal facing the terminal
600 mm
1200 mm
N/A
1200 mm
L
From an opening in the car port ( e.g. door,
window) into the dwelling
1200 mm
1200 mm
N/A
1200 mm
M
Vertically from a terminal on the same wall
1500 mm
1500 mm
N/A
1500 mm
N
Horizontally from a terminal on the same wall
300 mm
300 mm
N/A
300 mm
O
From the wall on which the terminal is mounted
N/A
N/A
N/A
50 mm
P
From a vertical structure on the roof
N/A
N/A
See Table 2
and Fig. 6b
N/A
Q
Above intersection with roof
N/A
N/A
See Table 2
and Fig. 4
150 mm
12
300 mm
NOTE N/A = Not applicable
a In addition, the terminal should not be nearer than 150 mm (fanned draucht) or 300 mm (natural draught) to an opening in the building fabric formed for the purpose of accommodating
a built-in element such as a window frame, (see Figure C2). Separation distances are linked to the rated heat inputs as shown.
b
This dimension may be reduced to 75 mm for appliances of up to 5 kW heat input.
11
FERROLI F24
3.01 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. 13a). 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. 13a. Using a core
drill cut a 118mm diameter hole for the flue.
Fig. 13a
Ø118
65
183 min
269
0
150 min
970 min
200
11
Ø3/4"
Ø1/2"
Ø1/2"
Ø1/2"
Ø1/2"
Ø3/4"
1
2
3
4
5
6
2. Safety Valve
3. Domestic hot water outlet
4. Gas supply
5. Domestic hot water inlet
6. CH return
200 min
1. CH flow
5 min
Fig. 13b
12
FERROLI F24
3.02 Restrictor
For boiler operation, the restrictor supplied with the unit must be mounted following the instructions below.
Determine the correct size of flue restrictor required. Before inserting the flue gas duct in the boiler, check that
the restrictor fitted is correct and that it is correctly positioned (see fig. 14).
N.B.: the diameter of the hole is
stamped on the restrictor
No restrictor is required for
back outlet flue
Holes Ø : 45 47 50
Ø
Fig.
14
CH OICE OF REST RICT OR:
• With 2 pipe system:
- Calculate the total flow resistance of the air and
flue pipes in metres (cap. 3.04.2)
• With concentric systems:
- Choose correct restrictor from table below.
- utilise the table shown below to choose the more
suitable restrictor for the flow resistance calculated
RESTRICTOR FOR TWO PIPE SYSTEM
Total flow resistance
of flue system
minimum
0m
13 m
23 m
38 m
maximum
13 m
23 m
38 m
48 m
Use
restrictor
size
mm
45
47
50
No restrictor
RESTRICTOR FOR CONCENTRIC SYSTEM
Flue lenght up to:
Use
restrictor
size
50 mm
Ccncentric 1 bend + 1 meter
60 / 100 1 bend + 3 meters No restrictor
1 bend + 3 meters
45 mm
Ccncentric
1 bend + 4 meters
50 mm
80 / 125
1 bend + 5 meters No restrictor
13
FERROLI F24
3.03 Top Outlet Concentric Flue Connection
3.03.1 Vertical concentric connection
A vertical connector can be supplied for vertical
discharge with concentric pipes.
The simple mounting and use of double lip gaskets
at the joints makes this an extremely easy and safe
option.
For flue length up to 1 m long the 50 mmØ restrictor is
required. Longer than this no restrictor is required.
Concentric
Vertical
Connector
Fig.
15
3.03.2 Horizontal concentric connection
A 90° bend (fig. 16) is supplied for the horizontal connection of air and flue gas pipes. This can be oriented
towards the chosen wall in degrees of 45°.
L
1KWMA31Y
50* 125
95
30
Ø60
Ø80
70
* = between 10 e 60 mm
80
L = S = D = 255
80
190
270
D
S
70 min.
Fig.
14
16
-3 mm/m
FERROLI F24
Notes on concentric horizontal installation
To locate the centre of the hole for passing the
pipes through the wall, refer to fig. 13b. Bear in
mind that the two concentric pipes must slope
downwards away from the boiler at a rate of
about 3 mm/m to avoid rainwater entering the
boiler. The concentric pipes making up the air
- flue gas duct must be sealed with the gasket
where they join the boiler (fig. 17). Outside, the
pipes should protrude from the wall between 10
and 60 mm (fig. 17).
Fig.
Between
10-60mm
17
3.03.3 Maximum concentric flue length
First table below shows the maximum flue lengths available for boilers with concentric systems.
For correct calculation remember to include the reduction for bends on second table. Please refer to
3.02 for use of restrictor.
Maximum flue lenght permissible
Ferroli F24
100 mm concentric
125 mm concentric
Vertical
Horizontal*
Vertical
Horizontal*
4m
3m
5m
5m
*For horizontal Flueing the reduction for appliance bend or turret are already included.
100 mm concentric bend 90°
1m
100 mm concentric bend 45°
0,5 m
125 mm concentric bend 90°
0,5 m
125 mm concentric bend 45°
0,25 m
max. 3 m
max. 4 m
Reduction for bend
concentric
100/60
concentric
100/60
Fig.
18a
Fig.
18b
15
FERROLI F24
3.04 Top Outlet: Two Pipe Flue System
3.04.1 Two pipe connection
Two separate ducts Ø80 for air intake and flue gas discharge can
be directly connected to the boiler. For converson to top outlet
(see 3.05) mount the separate outlet kit 1
Ø80
Ø80
FLUE
AIR
2
1
Insert blanking plate 2
in remaining air intake
Fig.
19
Connect flue duct to central hole Ø80 and air duct to left or right air intake hole Ø80. Insert blanking
plate 2 in remaining air intake.
A varied number of accessories for two pipe systems are available from Ferroli (ref. to page 17). Before
installing your system please check via calculation table at 3.08.2 you are not exceeding the maximum
permissible length for the appliance.
Notes on two pipe system installation:
When using the two pipe system the flue discharge pipe must have a 25mm air gap when passing through
combustible materials.
Where the flue discharge pipe passes through the airing space of an airing cupboard it must be protected by a non
combustible guard or expanded metal giving an annular air gap of at least 25mm.
Where the flue discharge pipe passes through a wall containing cavity insulation, a non combustible sleeve must
be fitted. Additionally a gap of 25mm between the sleeve and the insulation should be provided by cutting back
the insulation or packing loose fill bead insulation with mineral fibre.
Where the flue pipe is run through an unheated roof space it should be insulated with non combustible insulating
material to prevent condensation. The flue pipe should be supported at intervals of not more than 1.8m and
the support should be preferably below a joint.
3.04.2 Two pipe flue system
• Calculating maximum permissible flue length.
The calculation method is based on a standard reference parameter (1 metre of horizontal air flue 80 diameter 80) for
the maximum length permissible for all the pipes + fittings flow resistance coefficient. In other words, for all components
and pipes in the different installation configurations (vertical or horizontal, air or flue, etc.) and for all the fittings, a
flow resistance (reduction) equivalent to x metre of horizontal air induction pipe is indicated. For every boiler
model a maximum pipe length is provided, expressed in n metres of horizontal air pipe. In this way, to calculate
the length of a proposed 2 pipe air-flue system, add the flow resistance (reduction) in equivalent metres-air. For
every component and fitting present in the system, and to check that the total is less than the maximum length
the permissible for the boiler model.
IM
P ORTAN T: the pipes and fittings flow resistance (reduction) have been summarised on the following pages.
The flow resistance values written refer only to Ferroli pipes and fittings.
Calculation routine
1.
Utilise the pipes and fittings flows resistance tables on the following pages and calculate the total flow
resistance in metres-air, by adding the flow resistances of the components in the whole air-flue system, based
on their position (vertical or horizontal, air inlet or flue outlet).
Please note that the same fitting, identified by a one code (i.e. 1 pipe diameter 80, code KWMA83A), can offer
different flow resistances if positioned as air inlet or flue outlet, if placed vertically or horizontally.
The flow resistance of the special two pipe flue-air adapters do not have to be included in the calculation
as they are already included in the maximum length calculation.
2.
For the restrictors, please refer to cap. 3.02 to determinate the correct diaphragm.
3.
Check that the total flow resistance calculated is less or equal to 48 metre, the maximum permissible
for Ferroli F24.
16
8
0
1
2
1
1,2
2
2,2
1,5
2,5
1,5
2,5
3
0
Ø
8
0
7
A
c
c
e
s
s
o
r
i
e
s
5
Ø
1
0
0
Outlet flue air inlet for
connection with split end
Ø80
Pipe fitting for
outlet flue Ø80
Outlet flue air inlet
for concentric system
Ø80
A
c
c
e
s
s
o
r
i
e
s
Male-female Male-female bend Male-female
bend 90° Ø100
45° Ø100
flue Ø100
1
Horizontal
Vertical
Horizontal
Description
Air
0,4
0,4
1,5
Horizontal
Reduction
Vertical
Flue
Horizontal
Vertical
Air
Air wall terminal
products of
combustion Ø100
Description
Vertical
Tab. 1 - Pipes and
fittings reduction table
Air terminal
of outlet
protection
Ø100
Male-female Female-female Female-female Male-female
bend 90° Ø80 bend 90° Ø80 bend 45° Ø80
flue Ø80
3.04.3 (continued)
Spigot and
socket
reduction
Ø 80/100
Ø
Pipe fitting
M/M/F Ø80
with inspecting
plug+trap for
condensate drainage
system
A
c
c
e
s
s
o
r
i
e
s
Airwall terminal
Air terminal of
Spigot and socket Condensate flue
products
inlet protection Ø80 of combustion
outlet
Ø80 reduction Ø80/100
FERROLI F24
Reduction
Flue
4
12
0,4
0,8
0,6
1
0,8
1,3
3
1,5
3
17
FERROLI F24
For further accessories please refer to:
Attention:
"Flue system manual for room sealed
boiler"Example of calculation for wall
inlet/outlet with 2 pipe system
maximum total flue length: 48 metres
Resistance of flue restrictor (if req.)
is included (see table on page 13)
Remove the flue restrictor.
The flue and air pipes must have an inclination
downward equal to 3% from boiler to outside.
Ref.
N° of
pieces
1
1
Air bend 80 mm R/D = 0,75
2
13
Horizontal air pipe
3
1
Air wall terminal
4
1
Air inlet closing flange
5
1
Flue bend 80 mm R/D = 0,75
6
12
Horizontal flue
7
1
Air wall terminal outlet flue
Description
Code
Length or
reduction
1,5 m
13,0 m
2,0 m
—
2,5 m
24,0 m
5,0 m
Fig. 20
Total 48,0 m
3.04.4 Example of other installation with two pipe systems
Example of direct roof flue outlet
and wall air inlet
Example of roof
inlet/outlet
Example of wall inlet/outlet
2 pipe application
Fig. 2
1
Fig. 22
18
Fig. 2
3
FERROLI F24
3.05 For installation (back flue connection):
For direct back flue connection it is necessary to use the optional kit 1KWMR04A, and it is required to
alter the fan direction inside the boiler.
Follow carefully next procedure:
Remove fan by pulling off electrical connections. Pull off air
pressure switch tubes from the air
pressure switch remove 2 screws
b. Rotate the fan downward to
disengage it from the securing
pin a.
a
b
b
Fig. 24
a
Take off the four screws which
fix the back plate on sealed
chamber, remove and rotate the
plate through 90° and fit it to
the top of the boiler to cover
the original flue outlet. Secure
it in place with the four screws
removed previously.
Fig. 24b
Fig. 24c
Fig. 24
d
Remove fan mounting plate by undoing the three fixing screws d. Rotate the fan through 90° so that the fan nozzle
points sideways. Secure the fan to the plate in the new position using screws in position c.
c
For rear
outlet
For upper
outlet
d
d
c
c
c- d
d
c
Common
For upper outlet
For rear outlet
Fig. 24
d
e
c
d
Fig. 24f
Fig. 24g
19
FERROLI F24
Fix with the screws (b). Refit wiring connections to fan and air pressure switch tubes ensuring correct
orientation. I.E. red tube to air pressure switch connection with red dot (+) and clear tube to air pressure
switch connection with no paint marking (-).
Fit the fan into the boiler rotating the front to engage with the pin a. Secure with the screws b.
Rear
b
b
Fig.
Boiler Mounting Plate
149
178
131
24h
Fig.
20
25
FERROLI F24
Drilling Template (Rear Flue Application)
Select suitable mounting position for
boiler, using the template mark flue outlet
and boiler mounting points. Drill two
10mm holes 90mm deep to accept the
wall plugs, fit wall plugs. Fit two special
wall plugs on the wall as described in the
fig. 26a. Fasten the wall bracket to the
wall using an antitheft nut on the right
side and a standard nut (M8) on the
left side. Mount the boiler on the wall
bracket and fix using an antitheft nut on
the left side and a standard nut (M8) on
the right side.
Using a core drill cut a 118mm diameter
hole for the flue.
i
26a
183 min
F g.
125 min
178
254.5
280
270
932 min
Ø118
21 min
2.
3.
4.
5.
6.
CH flow
Safety Valve
Domestic hot water outlet
Gas supply
Domestic hot water inlet
CH return
200 min
1.
295.5 min
Ø 3/4"
Ø 1/2"
Ø 1/2"
1 2 3
Ø 1/2"
Ø 1/2"
Ø 3/4"
4
5
6
5 min
i
F g.
26b
21
FERROLI F24
Back flue outlet (Diagram 1-9)
2. Push through the outer flue.
1. Core drill 127mm hole (5").
Fig.
27a
4. Place wall plate on outer flue
ensuring it is level. Mark and drill
four holes, two top, for expanding bolts and two bottom for
plugs and screws. Fix plate to
wall with the square gasket
between the wall and the plate
use the large diameter washers
for the bolts and screws.
Fig.
Circular Gasket
3. Gently pull back until wall seal
is flush with the wall.
27b
27c
Fig.
Square Gasket
Fig.
27d
Fig.
27e
5. Through plate into air tube,
drill two holes and fix in place
using two self tapping screws
M4 x 6mm long.
6. Cut the outer flue flush with the
flange on the hanging plate.
Fig.
22
27f
7. Insert the aluminium flue pipe
into white plastic outer flue,
making sure the aluminium pipe
sits fully and centrally into the
flue terminal. Mark the aluminium
flue pipe at the point it is flush
with the mounting plate. Add
36mm to this mark and cut the
aluminium inner flue pipe at
this point.
36 mm
Fig.
27g
FERROLI F24
8. Install the inner metal flue into the outlet, up to
the wallplate flange mark.
9. Lift boiler with flue in place, engage inner and
outer flue, slide into position
Fig.
27h
9. Make sure the inner flue is fully engaged in
the flue terminal, secure boiler with two nuts
and washers, sevure bottom of boiler using two
screws and washers.
Fig.
27i
23
FERROLI F24
3.06 Connecting the central heating and domestic hot water circuits
Connect to the relevant connections as indicated in fig. 1.
Connect the pressure relief valve discharge pipe (15mm) to the outside of the building, where possible over a drain.
The discharge must be such that it will not be hazardous to occupants and passers-by or cause damage to external
electric components or wiring. The pipe should be directed towards the wall.
To ensure long life, the heating circuit should be correctly sized and fitted with all the controls necessary to ensure
correct functioning and operation. The differential between the boiler flow and return pipes should not be more
than 20°C. You are advised not to use the boiler with return temperatures of less than 50°C in order to prevent
patches of condensation forming and having a corrosive effect on boiler components.
3.07 Boiler water characteristics
If the water is harder than 18 clarke degrees, the water used should be treated to avoid possible scale in the
boiler caused by hard water or corrosion by aggressive water. It should be remembered that as a result of its
low thermal conductivity, even scale of just a few millimetres thick can lead to considerable overheating of
the boiler walls, resulting in serious problems.
IT IS ABSOLUTELY VITAL THAT THE WATER USED IS TREATED IN THE FOLLOWING CASES:
a) Extensive systems (containing large quantities of water);
b) Frequent additions of water to top-up the system;
c) Domestic hot water circuits
If the system requires partial or total emptying, you are recommended to refill it with treated water.
3.08 Filling
When cold, system pressure should be about 1 bar. If while running venting off of air dissolved in the water causes
the pressure of the central heating system to drop below 0,5 bar, the user must utilise a filling loop to bring it
back to the original value. During operation, water pressure in the boiler when hot should be about 1.5 - 2 bars.
After filling, always close and disconnect the filling loop.
Note - If there is a possibility of air pockets forming in certain points of the central heating system flow and return
pipes, you are recommended to fit an air vent valve at these points.
Note - When the boiler is installed below the level of the central heating a system, single check valve should be
fitted in the flow to prevent gravity circulation around the heating system.
3.09 Gas connection
Gas connection should be carried out using a rigid pipe.
The flow at the gas meter should be sufficient for the simultaneous use at full gas rate of all appliances
connected to it. Connect the gas supply to the boiler according to current regulations. The diameter of
the gas tube leaving the boiler is not the determining factor in choosing the diameter of the pipe between
the appliance and the meter. This must be selected in relation to length and pressure drop and in any
instance should not be less than 22mm.
The whole of the gas installation including the meter should be inspected and tested for soundness and
purged in accordance with BS6891-1988.
N.B. - The filling loop will be fitted by the installer in accordance with water by laws at the time of installing
the system. It is NOT a part of the boiler.
3.10 Electrical connection
The boiler must be connected to a single phase 230 V 50 Hz electricity supply with a 3 A max. fuse and a bipolar
switch with contact opening of at least 3 mm fitted between the boiler and the electricity supply. The boiler must
always be connected to an efficient earth installation. Under the electrical box, there is a 3 pole terminal board for
connecting the boiler to the mains (230 V 50 Hz) and a 2 pole board for connecting a room thermostat (RT). To connect,
undo the screws fixing the terminal board box and connect the wires, ensuring correct polarity of the terminals. It
should be noted that there is low voltage (24 V) between the room thermostat contacts.
When the boiler is connected to an electricity main, it is essential TO OBSERVE CORRECT POLARITIES (LIVE:
brown cable, NEUTRAL: blue cable, EARTH: yellow-green cable).
All wiring must conform to current I.E.E. regulations.
24
FERROLI F24
Note: If the power supply cable has to be replaced, use “0.75mm (24/0.20) heat resisting cable only to BS6500
with a maximum external diameter of 8 mm.
Note - When connecting a room thermostat or external timer, do not link the power supply of these devices
to the switching contacts. The switch contacts must be voltage free. Any mains powered devices must utilise
mains power solely to drive the timer motor.
Applying mains voltage to the switch contacts will irreparably damage the circuit board.
Although this boiler can also be used without a room thermostat, you are recommended to install one
for the following reasons:
Greater comfort conditions due to more accurate control of room temperature.
Greater energy savings.
3.11 Differential air pressure switch (fig. 2 - part 45)
The differential air pressure switch is a safety device which allows the main burner to ignite only after having
verified that the fan is working correctly. If the difference in pressure between the flue gas discharge pipe and the
air intake pipe is not at least equal to the minimum pressure switch calibration value, the pressure switch contacts
do not close and the gas valve is thus prevented from opening.
In addition, the electrical circuit of the boiler is designed so that if for any reason the air pressure switch contacts
remain closed when the fan stops, the burner will not start up again.
3.12 Checks
Fill the central heating system as described previously (3.08) and check there are no leaks in the domestic hot
water and boiler water circuits. Check that there are no gas leaks on the boiler or the supply to the boiler. Also
check that the electrical connections are correct.
3.13 Installing a room thermostat (72) (fig. 42)
To connect the thermostat:
Open the electrical box on the base of the appliance and remove the “jumper cable” between terminals
3 and 4.
Connect the room thermostat (72) as shown in fig. 42.
25
FERROLI F24
4. COMMISSIONING AND TESTING
4.01 Checks to be carried out before starting up for the first time
When starting the boiler up for the first time check:
• that the gate valves between the boiler and central heating systems are open;
• that the central heating system is filled and vented;
• that there are no gas or water leaks from the central heating system or boiler;
• that the electric connections are correct and the earth wire of the boiler is connected to an efficient earthing
installation and a 3amp. fuse is fitted to the isolator;
• that there are no flammable liquids or materials near the boiler;
4.02 Starting up the boiler
•
•
•
•
•
Open the gas cock upstream of the boiler.
Vent air present in the pipe upstream of the gas valve.
Turn on electrical supply to the boiler.
Rotate the ON-OFF RESET switch (fig. 2 - part 98) into the ON position.
Check inlet working gas pressure, burner pressures and gas rate.
At this point, choose whether the boiler is to be used for central heating and domestic hot water production or for domestic
hot water production only. If the former is chosen (central heating and domestic hot water production), turn the knob 63 (fig.
2) to the “Winter” position. Set the knob above 50°C and set the room thermostat (if fitted) to maximum. The burner ignites
and the boiler starts to function automatically, controlled by its control and safety devices.
If the latter is chosen (domestic hot water production only), position the knob 63 (fig. 2) on the “Summer” position. In this
mode the boiler is ready to operate automatically whenever domestic hot water is drawn off.
Note - If after completing the start-up procedure correctly, the burners fail to ignite and the boiler shut down
warning lights up, wait about 15 seconds then rotate the knob 98 (fig. 2) against spring pressure to the RESET
position and release it. The reset electronic control unit will repeat the start-up cycle.
Note - In central heating mode after resetting the boiler will go into it 2 minue delay before starting up again. If after
a second attempt the burners still fail to ignite, consult the paragraph “Troubleshooting”.
Note - If there is a power failure while the boiler is in operation, the burners automatically go out and
re-ignite when the power returns.
4.03 Shutting down
Close the boiler isolation gas cock and turn off the electricity to the boiler.
Important: If the boiler is not to be used for lengthy periods during the winter, to avoid frost damage, you are
recommended to drain the water from the circuits (domestic hot water and central heating). Alternatively, drain the
domestic hot water system only and add special anti-freeze to the central heating system.
4.04 Checks and controls after first start-up
•
•
•
•
•
Check there are no leaks in the gas and water circuits.
Check correct boiler start up by carrying out start up and shut down tests using the boiler stat.
Check the integrity of the air-flue pipes during boiler operation.
Check that the gas consumption indicated on the meter corresponds to that given in Technical Data (page 5).
Check that water is circulating correctly. Balance the radiators to ensure that the flow and return
differential does not exceed 20°C.
• Check that when operating in the “Winter” mode, the pump stops and domestic hot water is produced
correctly when the hot water tap is turned on.
• Check that in the “Summer” mode, the burner lights up and shuts down correctly when the domestic
hot water tap is turned on and off.
• Check that the domestic hot water flow and T correspond to the table. Do not rely on empirical measurements.
Temperature should be measured using thermometers as near as possible to the boiler, bearing in mind
the heat loss from the pipes.
26
FERROLI F24
• Check that the gas valve modulates correctly both during the central heating phase and the domestic
hot water production phase.
• Determine the combustion efficiency and the composition of the flue gases (refer to 6.04)
• If any of the above are not correct refer to Technical Data (page 5). Adjustment (refer to 5) and Fault
finding (page 39).
5. ADJUSTMENT AND GAS CONVERSION
5.01 Adjusting the pressure and flow rate to the main burner
This boiler operates on the flame modulation principle. It has two fixed pressure values, minimum and maximum,
which must be as shown in the table (pages 5), whichever type of gas is used.
Note - Because correct minimum and maximum pressures are critical to the efficient operation
of the boiler it is ESSENTIAL that the following adjustments are carried out by COMPETENT
personnel ONLY.
5.02 Adjusting minimum and maximum pressure
Honeywell V K4105G gas valve
-
Connect suitable pressure gauge to burner test
point “B” downstream of the gas valve.
-
Disconnect the pressure compensation tube «F».
-
Remove the protective cap «C».
-
Adjust potentiometre P3 (on the main board) at
minimum (clockwise).
-
Operate boiler for central heating
-
Adjust minimum pressure by rotating screw «D»
clockwise toreduce pressure and anticlockwise
to increase pressure.
-
Adjust potentiometre P3
(anticlockwise)
-
Adjust max pressure by rotating screw «E»,
clockwise to increase pressure and anticlockwise
to reduce pressure.
-
Reconnect the pressure compensation tube «F».
-
Replace protective cap «C».
at
C
maximum
Maximum + Minimum possible gas pressures are
now set. Range Rating the central heating is not
necessary (see paragraph 5.04).
Key
M
.
dj
.
dj
g
g
g
w
w
OUT
M
F
E
IN
A = Gas inlet test point
B = Gas outlet test point
C = Protection cup
D = in pressure a ustin scre
E = ax pressure a ustin scre
F = Balancin tube
B
A
D
Fig. 28
27
FERROLI F24
5.03 Adjustment
-
+
-
+
potentiometers
P5
P4
-
P1 = C.H. temperature adjustment
P2 = D.H.W. temperature adjustment
P3 = C.H. output adjustment
P4 = Ignition gas pressure adjustment
P5 = Minimum gas pressure adjustment
P1
+CH
P2
+DHW
-
-
+
P3
Fig.
29
5.04 Adjusting maximum output for central heating system (fig. 29)
This adjustment must be carried out electronically using the “P3” adjustment screw starting with a cold central
heating system. Connect a pressure gauge to the pressure test point downstream of the gas valve. Rotate the
temperature adjustment screw to maximum then regulate the pressure to the value required, consulting the diagram
(figs. 4 and 5 - page 7). Once this operation is complete, start up and shut down the burner two or three times using
the thermostat. Check each time that the pressure values remain as adjusted and that the burner ignites correctly.
Otherwise further adjustment is necessary until the pressure remains stable on this value.
N.B. - when carrying out this operation ensure that the boiler thermostat is set to maximum otherwise
the adjustment will not be accurate.
5.05 Adjusting central heating flow temperature
Central heating water temperature is adjusted by rotating the control knob (fig. 2 - part 63). Rotate the knob clockwise
to increase water temperature, anticlockwise to reduce water temperature. Temperature can be varied from a minimum
of 30°C to a maximum of 85°C. However, we recommend not operating the boiler below 50°C.
5.06 Adjusting room temperature (when a room thermostat is fitted)
Room temperature is controlled by positioning the room thermostat knob to the required value. The thermostat automatically
controls the boiler, temporarily interrupting the electrical supply subject to the room heat requirements.
5.07 Adjusting the central heating flow
t by varying pump flow-head
The thermal head t (the difference in temperature between the delivery water and return water in the central
heating circuit) must be less than 20° C. This is obtained by varying pump flow rate and head using the
multi-speed variator (or switch) on the pump itself. Increasing the pump speed reduces t and vice versa. The
minimum differential must not be less than 11°C.
5.08 Adjusting central heating system pressure
The pressure of water in the central heating system, read on the control panel pressure gauge, is adjusted
as described in paragraph 3.08 page 24.
N.B. - To avoid incurring unnecessary expense, in the event of boiler shut down, check that this is not caused by a lack
of electricity or gas, or low water pressure before calling the Customer Technical Service Helpline.
5.09 Gas conversion
The following adjustment and conversion operations must be carried out by competent personnel. FERROLI
Limited accepts no liability for damage to property or personal injury resulting from tampering with the
boiler by unauthorised persons.
To convert the boiler from Nat Gas to LPG and vice versa, the main burner injectors must be replaced. Minimum and
maximum pressures must then be adjusted on the gas valve (see Adjustment page 28).
Note: After converting the boiler from natural gas to liquid gas, fit the orange plate in the conversion
kit near the data plate.
Note: injector diameters and pressures at the main burner are given in Technical Data (page 5).
28
FERROLI F24
6. MAINTENANCE AND CLEANING
The following operations must be carried out by Corgi registered engineers only.
6.01 Annual Servicing
The following should be checked at least once a year:
• Water pressure in the central heating system when cold should be about 1 bar. If this is not the case,
bring it back to this value.
• Check control and safety devices (gas valve, flow meter, thermostats, etc) are functioning correctly.
• The burner and heat exchanger must be clean. To avoid damage, always clean them with a soft brush or
compressed air. Never use chemical products.
• The expansion vessel must be checked (precharge 1 bar).
• Check there are no leaks in the gas and water circuits.
• Check the air-flue gas duct terminal is free from obstructions and sound.
• The electrodes must be free from corrosion build up and correctly positioned.
• Gas flow and pressure must correspond to the values given in the Technical Data (page 5).
• The pump must be free to rotate.
6.02 Cleaning the boiler and burner
The boiler should be serviced annually. The heat exchanger and burner must never be cleaned with chemical
products or steel brushes. Particular attention must be paid to all seals and fixings associated with the room-sealed
compartment (gaskets, grommets, etc). Air leakage would cause pressure inside the compartment to drop, possibly
tripping the differential pressure switch and thus shutting down the boiler. After cleaning particular attention should
also be paid to checking stages of start-up and operation of the thermostats, gas valve and pump.
6.03 Servicing procedure
1.
2.
3.
4.
5.
6.
7.
8.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Visually check boiler for correct intallation and flueing.
Isolate electricity supply + check fuse is 3amp.
Remove case by undoing the two screws locate at the bottom rear corners, lift slightly and pull forward.
Carry out preliminary electrical checks at boiler junction box. This is located in the centre of the
boiler at the bottom and can be accessed be the removal of a single screw. Any faults found must
be rectified before proceeding.
If electrical checks prove O.K. replace cover and secure with screw.
Attach a manometer to the boiler gas inlet test point, turn on electricty and fire boiler for hot water, check
inlet pressure. This should be 20mbar minimum for NG and 37mbar for LPG. If this is not the case there is a
supply problem and this will need to be remedied.
If inlet pressure is O.K. shut down boiler and remove manometer from gas inlet pressure test point and attach
it to the boiler burner pressure test point. Reseal inlet pressure test point.
Fire boiler for hot water and check that the maximum pressure is 11.8mbar for NG and 36.0mbar for LPG.
Turn off tap. Turn P3 on the main circuit board to minimum and fire the boiler for heating, check that the
burner pressure reads 2.5 mbar for NG and 7.8mbar for LPG. Turn P3 back to max position. Shut down boiler,
remove manometer, seal test point. If the pressures are not as specified they will need to be adjusted on the
gas valve(see page 28 - installation manual).
Remove fan by undoing the two fan securing screws tilt the front of the fan upwards (downwards for
rear outlet flue) to detach it from the securing pin and withdraw it from the boiler, disconnect the
wires and air pressure switch tubes.
Take off the combustion chamber cover by removing the three securing screws.
Lift off flue hood and flue baffle plate.
Pull off the ignition and flame rectification leads from their respective electrodes.
Undo the gas union in the centre of burner rail and take out the two securing screws. Remove the burner
rail and clean rail and injectors.
Remove two screws securing the burner assembly and remove the assembly. Clean burners.
Clean heat exchanger with a soft brush.
Re-assemble baffle, flue hood and fan assembly, secure with screws previously removed.
Refit burner assembly and burner rail.
29
FERROLI F24
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
Reconnect ignition and flame rectification leads.
Reconnect gas union and tighten.
Refit combustion chamber cover, secure with screws.
Examine seals on room sealed cover refit cover and secure with screws.
Turn on gas and electricity.
Fire boiler and check all gas joints for soundess.
Check flame picture and all controls for correct operation.
Check room sealed cover for leakage.
Check domestic water flow rate and temperature is within specifications.
Check operation of all safety cut off devices.
If a combustion analyser is to be used there are test points provided on the front of the room sealed cover.
The right hand grommet is for air and the left hand one is for flue gas. The boiler must reach operating
temperature before this test is carried out (normally 10-15 minutes). CO/CO2 ratio should not exceed 0.0080.
Immediately after servicing (0.0040 at any other time)
30. Refit case and secure with screws.
31. Leave boiler set to customers requirements.
6.04 Flue Gas Analysis
1.
2.
The appliance should be checked visually for obvious defects.
After removing the jacket on the boiler there
are two test point, one for flue gas and the
other for air.
3. Open the air and flue gas test points;
4. Introduce the probes as far as the retainer;
5. Turn on the hot water tap;
6. Turn the domestic hot water stat to maximum;
7. Allow the boiler to reach thermal equilibrium
(10 - 15 min.);
8. Take reading;
9. The CO/CO2 ratio should be 0.0040 or below.
If the reading is above this then a full strip
down service must be carried out and the
cause remedied.
10. Following a full strip down service and after
reaching thermal equilibrium the permissible
reading is 0.008 or below.
N.B.: To ensure correct readings the boiler must
have reached normal operating temperature.
Testing the boiler before thermal equilibrium
has been attained will give incorrect readings.
N.B.:
30
FLUE
AIR
Fig. 30
If you have only 1 probe, measure separately air and flue gas, close the test point not in use.
FERROLI F24
7. REPLACEMENT OF PARTS
7.01
Initial procedure
a) The boiler is cold, electricity supply is isolated, and the gas supply is turned off at the inlet of the boiler
b) For replacement of parts where water connections are broken, it will be necessary to isolate and drain either
or both the central heating or domestic hot water circuits of the boiler only. The cold water mains inlet is
isolated at the inlet cock. The D.H.W. is drained by opening a hot tap.
The C.H. flow and return cocks are turned off at the isolation cocks. The C.H. is drained via the pressure
relief valve (twist about 1/2 of a turn).
c) Remove components following special notice below and replace in reverse order.
d) Ensure water and gas washers are in good condition.
7.02 Final procedure
• Re-open cocks and re-charge the system to about 1 bar, and vent boiler and radiators.
Re-charge to 1 bar if necessary.
• Upon completion of the work the following. Should be checked:
I) Gas soundness of all joints
II) Water soundness of all joints
III) The electricity supply.
IV) The pressure of the sealed system and top up where necessary.
7.03 To lower the control panel (fig. 31)
• Remove the two fixing screw (fig. 31) "A"
• Rotate down the front panel "C"
C
Fig.
A
7.04
Remove and re-presurising of C.H. expansion
vessel (fig. 32)
31
B
• Refer to 7.01 a, b
• Isolate electricity and water supplies
• Remove outer case (two screws bottom
rear corners)
• Loosen the "A" connections to expansion vessel
• Remove "B" screw
• Remove the expansion vessel
• Re-assemble in reverse order
• Re-pressure expansion vessel
(charge pressure 0,8-1 bar) through the valve "C"
• Ensure pressure relief value is open
(twist about 1/2 of a turn) when repressurizing
A
Fig.
32
C
31
FERROLI F24
F
7.05 Gas valve (fig. 33)
• Isolate gas and electricity supplies
• Remove outer case (two screws bottom rear corners)
• Remove the two securing screws
and lower control panel
• Disconnect electrical connections from valve ("A")
• Disconnect plastic tube "C"
• Loosen the connection "D" on gas pipe and the gas
inlet connection of the boiler "E"
• Remove the two fixing screw "E" below gas valve
• Slide out gas valve
• Remove four fixing screw "F" on top of
the valve and disconnect the gas pipe
• Remove bottom connection from gas valve.
• Fit top + bottom gas connections to the new gas valve
and replace in reverse order
D
C
A
Fig.
E
33
A
7.06 Air pressure switch (fig. 34)
•
•
•
•
•
•
•
Isolate electricity
Remove outer case (two screws bottom rear corners)
Open room sealed department
Remove the two screw "A" fixing air pressure switch
Disconnect electrical leads "B"
Remove pressure sensing tubes (white=D; Red=C)
Note relevant positions of all connections and
replace in reverse order.
B
7.07.1 D.H.W. temperature sensor or Central Heating Temperature Sensor
(fig. 35)
• Isolate electricity and water supplies
• Remove outer case (two screws bottom rear corners)
• Remove the two securing screws and lower control panel
• Identify the sensor from figure 35
• Disconnect electrical connection to the sensor
• Drain the affected service either D.H.W. or C.H.
• Unscrew the sensor
• Replace in reverse order
C
D
Fig.
7.07.2 Water Pressure Switch (fig. 35)
•
•
•
•
•
•
•
•
Isolate electricity and water supplies
Remove outer case (two screws bottom rear corners)
Remove the two securing screws and lower control panel
Identify the switch from figure 35
Disconnect electrical connections + note positions to the switch
Drain the boiler
Unscrew the sensor
Replace in reverse order
Water pressure switch
34
D.H.W.
sensor
7.07.3 Safety Valve (fig. 35)
•
•
•
•
•
•
Isolate electricity and water supplies
Remove outer case (two screws bottom rear corners)
Remove the two securing screws and lower control panel
Identify valve from fig. 35
Drain the boiler
Release the outlet union to the valve and undo the valve
union connection
C.H. sensor
• Remove the valve outlet fitting
• Replace in reverse order
32
Safety valve
Fig.
35
FERROLI F24
7.08 Removal of burner (fig. 36)
• Isolate gas and electricity supplies
• Remove outer case (two screws bottom rear
corners)
• Remove room sealed cover
• Disconnect ignition and flame rectification
leads "A"
• undo gas rail union "B"
• Undo two screws securing the burner assembly
to the boiler combustion chamber "D"
A
• Withdraw the burner assembly
7.09 Injectors (fig. 36)
D
D
C
B
• Proceed as 7.08
• Remove fixing screw "C" on both
sides of gas collector
• Remove gas collector
• Unscrew and remove injectors;
• Clear or change injectors
Fig.
36
7.10 Removal of fan (fig. 37)
• Isolate gas and electricity supplies
• Remove outer case (two screws bottom rear
corners)
• Remove room sealed cover
• Disconnect fan electrical leads "A"and note
positions
• Disconnect air pressure tubes from air pressure
switch "B" + note positions
• Undo two screws securing fan assembly "C"
Overheat cut off
• Remove fan from boiler
• Swap mounting plate over to new fan + replace
in reverse order
C
A
Limit thermostat
7.11 Limit thermostat, or overheat cut off
thermostat (fig. 37)
• Isolate electricity
• Remove outer case (two screws bottom rear
corners)
• Remove room sealed cover
• Identify the location of thermostat from fig. 37
• Pull out thermostat from tube, with its spring
• Remove electrical connections from thermostat
• Remove spring from thermostat
• Replace in reverse order
B
Fig.
37
33
FERROLI F24
7.12
Spark or flame detect electrode
(fig. 38)
• Isolate gas and electricity supply
• Remove outer case (two screws bottom rear
corners)
• Open room sealed compartment and
combustion chamber
• Identify electrode from fig. 38
• Unplug electrical connection "A" from sensing
electrode
• Remove fixing screw and remove flame detect
electrode
• Remove the two fixing screw from spark
electrode plate and remove it.
Flame
detect
Spark
A
Fig.
38
7.13 D.H.W. flowmeter
• Isolate electricity and water supplies
• Open a hot water tap to release water pressure
from the domestic side of the heat exchanger,
close tap.
• Remove outer case (two screws bottom rear
corners).
• Remove two screws from control panel and tilt
forward
• Take off protective cover from main PCB and
unplug flow meter lead from terminal X6
• Place a piece of cloth or some other absorbent
material over rear of control panel to catch
any drops of water that may be released when
removing the flow meter
• Using a 24mm open ended spanner, undo flow
meter unions "A" and "B" taking care not to
twist the copper tubing (access through base
panel).
• Remove flow meter, check + clean filter +
restrictor + fit to new flow meter.
• Reassemble in reverse order.
A
B
Fig.
39a
Fig.
39b
Take care on correct position of
components as reported in fig. 39b
Key
37 Cold water inlet filter
38 Gasket
39 Cold water flow limiter
34
37
38
39
38
FERROLI F24
7.14
Pump (fig. 40)
Replacement of pump head
• Isolate electricity and flow and return pipes
• Remove casing (two screws bottom rear corners).
• Remove the two securing screws and lower control
panel
• Release pressure from boiler via pressure relief valve
• Unplug the pump lead "A" from the pump head
• Place a piece of cloth or other absorbent material
over the rear of the control panel to catch any
drops of water that may fall when the pump head
is removed.
A
• Using a 4mm allen wrench undo the four allen screws
"B" in the pump head, lift away pump head from
the pump body
• fit new head into pump body and secure with the
allen screws tightening evenly.
• Replace electrical connection.
B
F
E
Replacement of pump body (fig. 40)
• Proceed as for removal of pump head
• Disconnect the expansion vessel connecting pipe "E"
from the rear of the pump body by removing the clip
from the left hand side
• Disconnect the boiler return pipe
• Disconnect the pump to heat exchanger connection
by removing the clip "F"
• Unscrew the nut on bottom of pump "D"
• Turn the pump body through 90°, pull the bottom
forward and withdraw the pump body
• Reassemble in reverse order taking care to ensure the
O-rings are in place and undamaged.
Fig. 40
D
7.15 Removal of heat exchanger
•
•
•
•
•
•
•
•
•
•
•
Isolate gas, water and electricity supplies
Remove casing (2 screws bottom corners)
Remove the two securing screws and lower control panel
Drain heat exchanger for both CH + DHW
Remove sealed compartment front panel
Disconnect the overheat thermostat and central heating limit thermostat
Remove the main burner, fan, flue hood and flow meter as described previously
Remove the pump to heat exchanger flow connection and locknut
Undo the domestic water outlet connection and locknut
Lift out heat exchanger
Re-assemble in reverse order
35
FERROLI F24
8. FAULT FINDING
Before beginning any fault finding ensure that gas, water and electricity are available.
WARNING: DO NOT link any terminals on block X10 or X11 as this will damage the PCB beyond repair.
8.01 Operating Sequence
With the power established the boiler is in its stand-by mode i. e. power on but no demand. The operational
sequence for C.H. and D.H.W. are as follows:
Central Heating Mode
External Call for Heat: The temperature regulator, built in or remote clock and room thermostat, if fitted, must
all call for heat. This will cause the pump to run.
Internal Call for Heat: C.H. flow temperature sensor, 88°C high limit and low water pressure switch all calling for
heat. If both external and internal calls for heat are present the MF03 PCB will energise.
In demand the fan will go to high speed causing the air pressure switch to operate. If the overheat (100°C) stat is
closed circuit the ignition will operate and the gas valve will be energised.
The burner will light at ignition burner pressure, automatically range rating itself up to the heating load, then
modulating down when the boiler reaches the desired flow temperature. When the central heating is satisfied the
burner will go off and the fan stops i.e. stand-by mode.
Note - If the boiler thermostat is set to maximum than the burner pressure will go to maximum effectively
bypassing the auto range rating facility
Domestic Hot Water Mode
External Call for D.H.W: Flow meter registers at least 2.5 litres/min flow to the hot water taps.
Internal Call for D.H.W: Hot water flow temperature sensor 88°C high limit stat and low water pressure
switch calling for heat.
If both internal and external calls are present the boiler follows the same sequence as for C.H. to light the burner.
However, for D.H.W. the burner will go straight to maximum and then modulate once the water reaches the set
temperature of the control thermostat. Turning the tap off will return the boiler to stand-by mode.
Note: Following shut down of the D.H.W. or C.H. the boiler will go into a three minute central heating delay.
8.02 Limit thermostats
T/Stat
Location
Function
Nominal
Operating
Temperature
Circuit
Wiring
Colours
C.H. Limit
Top RHS
of Heat
Exchanger
Shuts downmain
burner if boiler
thermostat fails
88°C
Low voltage
DC
Blue
Brown
Frost
Incorporated
in C.H.
Sensor
Fires the boiler
and runs pump to
maintain minimum
water temperature
7°C - 14°C
Low voltage
DC
Red
Red
Overheat
Top LHS
of Heat
Exchanger
Protect boiler by
stopping ignition
and cuts power
to gas valve
100°C
240V AC
Brown
Blue
The MFO3 PCB has fivediagnostic lights, each light corresponds to a particular function and will light in turn as
the boiler goes though its sequence of operations.
36
FERROLI F24
In order, the five lights indicate:
1
2
3
4
Boiler On Indicate
Boiler Shut down warning
Domestic Hot Water circuit ON
Central Heating standby (Flashing Light)
Central Heating circuit ON (Permanent Light)
5 Insufficient pressure in Central Heating System (Flashing Light)
Electric power supply ON (Permanent Light)
Note: Always check for sufficient gas supply (20mbar inlet working pressure for NG and 37mbar for LPG).
Minimum of 22 mm diameter pipework on C.H. flow and return with adequate by-pass. A correctly installed
flue system and a 3 amp fuse.
8.03 MF03 PCB
When operating the C.H. the following lights should be on: 4, 5 and flame on light. For D.H.W. the following
lights should be on: 3, 5 and flame on light.
If the boiler works for C.H. but not D.H.W., or vice versa, a number of components must be functioning and
can, therefore, be eliminated as being at fault.
Boiler will not light for D.H.W.
If boiler works for C.H. but not for D.H.W. the fault is most likely to be the flow meter or D.H.W. sensor.
If the tap symbol light is on the fault is the D.H.W. sensor. If this light is not on then suspect the flow
meter has not operated.
Boiler will not light for C.H.
If the boiler works for D.H.W. but not for heating the fault is most likely to be external controls (i.e. clocks or room
thermostats). Integral clock if fitted or C.H. sensor.
If the heating demand light is on the fault is most likely the C.H. sensor. If this light is not on suspect either
a clock or room thermostat not calling.
To override/eliminate any external controls disconnect them from terminal 3 and 4 underneath the boiler
and refit the link wire (see fig. 42).
Boiler will not light for D.H.W. or C.H.
The fault is likely to be a component common to both services. Open a hot tap to create a demand - is
there a spark at the ignition electrode?
Yes
Suspect gas supply, pressure or gas valve.
No
Is fan running?
Yes
Suspect air pressure switch or overheat stat (if boiler locks out without sparking go to overheat stat)
No
Is low water pressure light Flashing?
Yes
Top up water to above 1 bar. Does the light go out? (if water pressure o/k suspect high limit stat)
Yes
Does fan start?
Yes
Does boiler light?
Yes
Is hot water OK?
Try heating, if heating does not work follow guide for heating faults. Does low water pressure
light go out?
No
Suspect low water pressure switch.
If boiler still does not fire see comprehensive fault finding chart.
37
FERROLI F24
8.04 Temperature sensors (thermistors)
Identical, but individual, negative temperature co-efficient (NTC) thermistors are fitted in the C.H. and D.H.W. outlets
from the heat exchanger. As the water temperature increases the resistance in the thermistor decreases. This causes
the PCB to reduce the voltage to the modureg, in turn reducing the burner pressure. The wiring for each thermistor
is colour coded red for C.H. and blue for D.H.W. The sensors are fitted in wet pockets.
8.05 Limit thermostats
Two surface mounted auto reset bi-metal thermostats are located on the heat exchanger secured by spring
clips. Heat sink compound is used.
8.06 Ignition PCB
Located to the right hand side of the electrical control compartment accessed by lowering the facia then
removing the rear cover.
8.07 Main printed circuit board
Secured by flour plastic tabs the PCB is situated inside the control compartment. The transformer for low voltage
AC is attached to the PCB as is the DC rectifier. Potentiometers control C.H. output and maximum D.H.W.
temperature, both are adjustable by the controls on the facia and because the boiler features automatic
range rating no adjustments need to be made. Electro mechanical relays control pump operation and
put switched live to the ignition PCB (demand relay), they have transparent plastic covers so that their
contacts can be seen moving.
8.08 Air pressure switch
Operating at 230 V AC and situated next to the fan. Different coloured tubes connect the switch to the fan. It is a
make on pressure switch and only uses two terminals, the middle terminal is not used.
8.09 Short spares list
KEY NO.
(from fig 2 )
DESCRIPTION
PART NO.
G.C. NO.
14
Safety Valve
800130
386-816
16
Fan
800480
E23-851
34
Central Heating Flow Temperature Sensor
800320
E23-839
42
Domestic Hot Water Flow Temperature
Sensor
800320
E23-839
43
Air Pressure Switch
800150
E23-840
44
Honeywell Gas Valve
800266
E23-768
49
Overheat Safety Thermostat 100°C
801270
386-815
50
High Limit Thermostat 88°C
800160
386-577
81
Ignition Electrode C/N fixing Bracket
806460
82
Flame Sensing Electrode
801438
E23-855
136
Flow Meter
803430
E03-340
Main PCB MF02
801873
E23-862
Ignition PCB
800655
E23-848
Heat Exchanger
802180
E23-919
27
38
FERROLI F24
8.10 General test and fault finding
Chart 1
Check electrical supply - C.H. water pressure and frost protection
Chek the following carefully before starting
• Gas supply is turned on, is adequate and purged
• Electricity supply is turned on
• Polarity is correct
• CH pressure is set between 1 - 1,5 bar
• CH pump spins freely
D.H.W. taps closed
CH Selector to
Summer “ ” position
Put main switch to on
Is LED5 on?
NO
YES
YES
Water pressure
is not set
between
1 - 1,5 bar?
NO
Check and if necessary
replace 2A fuse
NO
Is LED5 ON now?
Set pressure to
1 - 1,5 bar
Check water
pressure
switch wiring
connection
YES
Does fan run at full speed?
YES
NO
YES
Is LED5 flashing?
YES
Is 230V present across
terminals X1-1 X1-2?
Repair external
wiring fault
NO
Replace
main board
NO
Go to CHART 2
Does CH Pump run? NO
Check and if
necessary
replace water
pressure switch
YES
If the boiler temperature
is less than 5°C
frost protection is activated
Disconnect
CH flowtemp sensor
YES
Has fan speed stopped?
NO
Change main board
39
FERROLI F24
Chart 2
Check Domestic Hot Water operation
Open DHW taps
NO
DHW flow rate at
least 2,5 litre/min?
YES
Check cold water
inlet pressure
Is LED3 on?
Check if water
filter is clean
NO
Check and if necessary
replace DHW Sensor
YES
Check and if necessary
replace Flow Sensor
YES
Is LED4 flashing?
NO
YES
Check and if necessary
replace main board
Is relay RY100 switch on?
NO
Go to
chart 4
Check and if necessary
replace limit thermostat
Chart 3
Check Central Heating operation
DHW taps closed
Does pump run?
NO
YES
Put CH temperature selector
to maximum
Go to chart 4
NO
YES
Check and if
necessary replace
main board
YES
Check and if is necessary
replace CH sensor
40
NO
YES
Wait 2 minutes
Is LED4 flashing?
Is relay RY100
switch on
Go to chart 4
NO
YES
NO
Ensure external controls
are calling for heat
Is LED4 flashing?
Is relay RY101
switch on
Check
limit thermostat
Check and if
necessary
replace pump
FERROLI F24
Chart 4
Check fan/flue gas system
Does fan run?
NO
YES
Is relay RY100 switch ON?
YES
Is air pressure switch
activated?
NO
NO
Go to chart 5
Differential air pressure
across the air pressure YES
switch is greater than
180 Pascal?
Go to charts 2-3
Is 230V present across
fan terminals?
YES
NO
YES
Check and if
necessary replace
air pressure switch
Check and clean fan
NO
Check air pressure
Check and if
switch wiring connection necessary replace fan
Check flue and air
intake are correct
and clean
NO
Check Venturi and
air pressure switch
tubes are clean
Check and if
necessary replace
air pressure switch
Check restrictor
is correct
Chart 5
Check D.H.W. and C.H. modulation
YES
Normal operation
carry out
Boiler operated
on central heating mode
Boiler operated
on DHW mode
Does burner
flame modulate?
Does burner
flame modulate?
NO
NO
Check wiring connection
to CH sensor
Check wiring connection
to DHW sensor
Check CH sensor
and replace it if necessary
Check DHW sensor
and replace it if necessary
YES
Normal operation
carry out
41
FERROLI F24
Chart 6
Check ignition system
Is LED1 light on?
Does sparking start
at burner?
Is LED2 on
without
the boiler sparking
NO
YES
Does burner light?
YES
YES
Go to chart 6
NO
NO
Check and if necessary
replace P.C.B.
Check electrodes and
leads for damage
and correct connection
YES
Reset lockout
YES
Check and if necessary
replace P.C.B.
NO
Is flame present before
lockout condition?
NO
YES
Adjust with P4 ignition
burner pressure
Check and if necessary
clean burner
Check and if necessary
clean injectors
Check and if necessary
clean flame electrode
Check right position
of spark electrode
Check wires
42
Re-check
air pressure switch
Check and if necessary
replace safety thermostat
Is LED2 on
after 10 seconds?
Does burner light now?
NO
Check gas supply
is live and purged
Check and if necessary
replace gas valve
FERROLI F24
9. ELECTRICAL AND FUNCTIONAL SCHEME
9.01 Main components layout on electronic boards
Potentiometer adjustment
P1
P2
P3
P4
P5
= Central heating flow temperature adjustment
= Domestic hot water temperature adjustment
= Central heating flow output adjustment
= Ignition gas pressure adjustment
= Minimum gas pressure adjustment
PC
PNO
L
10
9
8
FAN
N
HL
HL
7
6
5
X1
MV1 MV2 MV3 MV4
N
L
2
1
X2
X3
X4
13 12 11
5
4
X6
4
3
2
1
-
+
-
+
2
1
3
1
10
9
8
7
6
3
2
1
JP03
P5
P4
X8
P1
+CH
-
P2
+DHW
-
RY101
X11
X12
2
1
98 7654321
L1
L2
L3
+
P3
L4
1
RY100
X5
2
X10
L5
Nat/LPG
Transformer
X7
JP02
JP01
MF03F
Fig.
JP01 ON = Delay between shutdown and re-ignition disabled
JP01 OFF = Delay between shutdown and re-ignition enabled
JP02:
Temp.
sensor
NTC
(34) (42)
temp.
10 °C
25 °C
60 °C
80 °C
41
Ohm
20
10
2,5
1,25
kOhm
kOhm
kOhm
kOhm
Jumper on for natural gas
Jumper on for LPG
JP03 ON = Max temperature D.H.W. 62°C
JP03 OFF= Max temperature D.H.W. 55°C (standard)
43
16
32
34
42
43
44
49
50
62
Y/G
Y/G
BL
BL
T
a
n
a
a
a
n
a
a
n
k (
a
a
a
X7
X8
n
a
n)
a
BR
a
8
a
7
BR
n
6
Blue
5
W MV1
n
4
n
n
a
72
81
82
98
114
136
MF03F
1
MV2
O
2
MV3
V
3
MV4
R
BR
Ce tr l he ti g pump
Ce tr l he ti g flow temper ture se sor
Domestic hot w ter flow temper ture se sor
Air pressure switch
G s v lv e
S fety thermost t
Ce tr l he ti g limit thermost t
ime cloc optio
Fan
82
9
Blue
10
Blue
2
BR
1
BR
1
3
Blue
X3
1
230V
98
1
Blue
R
R
V
R
n
Red
Violet
Gree
an
Or ge
G
6
-
G
5
4
+
3
1
JP03
2
BL
X5
62
3 2
M 1
IMPORTANT
TEST
5
3
4
72
F
ig
.
42
USE A ROOM THERMOSTAT (24 V)
WITHOUT VOLTAGE TO THE CONTACTS.
CONNECTING 230 V TO THE ROOM
THERMOSTAT TERMINALS WILL
IRREPARABLY DAMAGE THE
ELECTRONIC BOARD.
JP02
JP01
7
Blue
Nat/LPG
8
O
X11
9
O
White
13 12 11 10
Blue
Brown
Blue
B la c k
X4
BR
34 42 114 50 136
O
BR
BLUE
BL
W
Key
X10
98 7654321
2
24V
X12
230V 24V
2
Blue
X2
BR
Room thermostat
Ignition electrode
Sensor electrode
Off/On/Reset switch
Low water pressure switch
Flow meter
X1
32
W
44
R
49
9.02 General wiring diagram
Key
81
X6
16
Blue
43
BL
2
44
1
230V
50Hz
FERROLI F24
FERROLI F24
10. USER INSTRUCTIONS
bar
RE
OF
F
ON
SE
2
3
4
T
1
5
0
°C
6
°C
Fig.
A
1
2
B
3
4
C
5
LED
1
Burner on indicator
2
Boiler shut down warning
3
Domestic hot water circuit on
4
5
bar
Central heating stand-by
Central heating circuit on
Insufficient pressure in central heating system
Electric power supply
D
43
E
KEY DESCRIPTION
A
Switch OFF/ON/RESET
B
Central heating flow
temperature regulation
C
D.H.W. temperature
regulation
D
Water pressure gauge
E
Time clock (option)
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.
Make sure that the gas, water and electricity supplies to the boiler are turned on.
The boiler pressure gauge (D) should read at least 1 bar.
Low pressure will be indicated by flashing light in the middle of the facia illuminating ( bar ).
Hot Water Only - “SUMMER” (
)
To obtain hot water only from the boiler, turn switch (A) to the on position. The top green light on the left side of
the control panel is illuminated (power on
).
Turn the temperature regulator (B) 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 (C) clockwise to increase and anti-clockwise
to decrease the water temperature.
Heating and Hot Water - "WINTER” (
)
To obtain heating from the boiler, turn the temperature regulator (B) clockwise to the maximum position, ensure that
any other heating controls e.g. room thermostats, clock etc. are in the on position.
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.
45
FERROLI F24
Boiler lock out
) coming on, the on/off/reset switch (A) should be turned clockwise against
In the event of the red lockout light (
the spring tension to the reset position and released (this will put the boiler into three minute delay if in the heating
mode). If the lockout light (
) illuminates repeatedly, contact an approved Férroli service engineer.
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.
Cleaning
The casing requires no special cleaning, a wipe with a soft duster or damp cloth will suffice.
Maintenance
Férroli recommend that the appliance is serviced at least once every twelve months by a competent
engineer.
Gas Supply
It is the law that all gas appliances are installed and serviced by a competent person in accordance with
the Gas Safety Regulations (Installation & Use) 1996, and the manufacturers instructions. Failure to observe
these requirements may lead to prosecution.
Electrical Supply
WARNING - This appliance must be earthed.
The electrical wiring must be carried out by a competent electrician.
The colours of the wires in the mains lead of this appliance may not correspond with the coloured markings
identifying the terminal in the plug. Therefore, proceed as follows:
The wire coloured green and yellow must be connected to the terminal in the plug marked with either the letter
E or by the earth symbol or coloured green or green and yellow. The wire coloured blue must be connected to
the terminal marked either with the letter N or coloured black. The wire coloured brown must be connected to
the terminal marked either with the letter L or coloured red.
MINIMUM CLEARANCE
The minimum clearance around the appliance should be as follows:
Sides
Front
Below
Above
46
5mm
600mm
200mm
100mm
Top Flueing
FERROLI F24
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”.
I
F
AUTO
O
AUTO
P
B
x
x
+
P
-
A
B
P
D
E
F
R
A
E
OVER RIDE
R
P
D R
Slide switch: set clock - auto - set programme
Display. Symbol
in Display = Timer ON
Select programme ON/OFF 1.....8
Push buttons Time + Time Override: Boiler will switch ON if it is OFF; and OFF if it is ON
I=Heating continuous - AUTO=Heating timed - O=Heating disabled
Reset (with pencil) only 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.
6:30 - 8:30
12:00 - 12:00
16:30 : 22:30
The timer is pre programmed with 3 ON and 3 OFF times.
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
1. Slide switch (A) to right position (P)
Display
2. Press button (P)
Display
6:30
1
8:30
2
12:00
1
9:00
2
Display
12:30
3
4.1 Use button + and - to set 2nd OFF time eg. 14:00
12:00
4
Display
14:00
4
5.1 Use button + and - to set 3rd ON time, eg. 16:00
16:30
5
Display
16:00
5
6.1 Use button + and - to set 3rd OFF time eg. 23:30
6. Press button (P)
Display
Display
3
5. Press button (P)
Display
6:00
3.1 Use button + and - to set 2nd ON time, eg. 12:30
4. Press button (P)
Display
Display
2.1 Use buttons + and - to set OFF time, eg. 9:00
3. Press button (P)
Display
1.1 Use buttons + and - to set 1st ON time eg. 6:00
22:30
6
7. The timer can be programmed with up to 8 ON and
8 OFF times by repeating the above procedure.
Display
8.
23:30
6
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.
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!
47
Should you require help with any difficulties
call our Technical Service Helpline on
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 in 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. 08707 282 885 - Fax 08707 282 886
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