Ferroli Divatop ST F 24 Manual

Appr. nr. B98.01 A - CE 0063 AT 4967
FERROLI F24
INSTALLATION, SERVICE AND USER
INSTRUCTIONS
G.C. NO: 47-267-31
3544015/0 - 07/2002
Gas Combination Boiler for Central Heating
andHot Water Production,Wall Mounted,
Copper Heat Exchanger,Fan Assisted,
Room Sealed,
Electronic Flame Ignition andControl

FERROLI F24
2
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)
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 aCORGI ID card and have aregistration number. Both
should be recorded in your central heating log book. You can check to the CORGI register
by calling CORGI on 01256 372300".
Ferroliisamember oftheBenchmarkinitiativeand fullysupportstheaimsof theprogramme.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.
INDE
1 DESCRIPTION
2TECHNICAL AND DIMENSIONAL CHARACTERISTICS 4
INSTALLATIN DETAILS
4COMMISSIONIN AND TESTIN 26
ADUSTMENT AND ASCONVERSION 2
6MAINTENANCE AND CLEANIN 2
REPLACEMENTPARTS 1
AULTINDIN 6
ELECTRICAL AND NCTINAL SCHEME4
1USERINSTRCTINS4

FERROLI F24
3
1 DESCRIPTION
1.01 Introduction
The Ferroli F24 is definedas a“room sealed” combination boiler, all air requiredfor combustion is takenfrom
outsidetheroominwhichitisinstalled.Itisanewhighperformancegasfiredheatgeneratorforcentralheatingand
domestichotwaterproduction.Aspecialfeatureofthis boilerisitsbuilt-inelectronicflame ignitionandcontrolunit
making burneroperation completely automatic and safe.The main components are as follows:
•Copperheat exchangerconsisting of three finnedtubesspecifically shapedfor high efficiency.
•There are three coppercoils insertedin the three heating circuit tubes. These represent the domestic
hot waterheat exchanger. Their shape and high exchange surface areaenable the full output of the
boilerto be absorbed.
•Ceramic fibre insulatedcombustion chamber
•12 stainless steelbladedburners specifically designedfor this boiler.
•Fan for discharge of combustion products and intake of combustion air.
•Differential air pressure switch.For safety reasons, this ensuresthe burnerignitesonly whenthe fan is functioning
correctly.
•Hermetically sealedcompartment made from corrosion-resistant steelenclosing the above components.
•Combination gas safety valve with modulator, complete with pressure stabiliser.
•Flowmetergiving the domestic hot watercircuit precedence overthe central heating circuit.
•Pressure reliefvalve for the central heating circuit setto openat 3bar.
•Built-in Expansion vessel.
•Variable speedpump.
•Central heating flow temperature adjustment thermostat.
•Domestic hot waterflow temperature adjustment thermostat.
•Central heating limit thermostat.
•Overheat safety thermostat.
•Electronic control unit for automatic flame ignition and control.
•Central heating low waterpressure cut off switch.
•Domestic hot waterflow temperature sensor.
•Central heating flow temperature sensor.
1.02Instructionsand regulations
Assembly,installation, firststartup andmaintenance mustbecarriedout bycompetentpersons only,in accordance
with all current technical regulations and directives.
OSHH
Materials usedin the manufacture of this appliance are non hazardous and no special precautions are
requiredwhenservicing.
Related Documents
Thisappliancemust beinstalled strictlyin accordancewiththeseinstructions.
The Gas Safety Regulations (Installations &Use)1996.
The Local Building Regulations.
The Building Regulations.
The Buildings Standards (Scotland -Consolidated)Regulations.
British Standards Codesof Practice:
B.S.75931992TREATMENT OF WATERINDOMESTIC HOT WATERCENTRALHEATING SYSTEMS
B.S.5546 1990 INSTALLATIONOF HOT WATERSUPPLIESFORDOMESTIC PURPOSES
B.S.5440 Part 12000 FLUES
B.S.5440 Part 21989 AIRSUPPLY
B.S.5449 1990 FORCED CIRCULATIONHOT WATERSYSTEMS
B.S.6798 1987 INSTALLATIONOF GASFIRED HOT WATERBOILERS
B.S.68911989 GASINSTALLATIONS
B.S.76711992IEE WIRING REGULATIONS
B.S.48141990 SPECIFICATIONFOREXPANSIONVESSELS
B.S.54821994 INSTALLATIONOF LPG
ModelWaterBye Laws
For Northern Ireland the rulesin force apply

FERROLI F24
4
Fig. 1
Top view
Distance between connections
178
190 270
Bottom view
272
760
249
98
609536 60 95
460
100
727
114
160100 25 150 25
84
80 80
12070 120 150
110
5
34
2
1
2TECHNICAL AND DIMENSIONAL CHARACTERISTICS
2.01 Technical information
Ferroli F24 boilers are central heating and domestichot water heat generators and are produced as
standard to function with natural gas or LiquidPetrolium Gas converted appliances.
Key
1 -3/4"central heating flow outlet
2-1/2"domestichot water flow outlet
3-3/4“gas inlet
4 -1/2"domestichot water inlet
5-3/4"central heating return inlet
6-Pressure relief outlet

FERROLI F24
5
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 untilthe
required output levelis reached (see figures 4and 5).
During domestic hotwater production,gas pressures to the burner must correspondtothe maximum
outputgiven in table forthe type ofgas.
Gas pressure must beadjustedduring maximum draw-off ofdomestic hotwater.
•Maximum working temperature forcentral heating flow:85°C
•Maximum temperature ofdomestic hotwater:55°C, adjustable between 40°C and55°C.
•Minimum domestic coldwater pressure requiredfor95%heat input:
- Flowrestrictorfitted(standard)- 1,2 bar;
- Flowrestrictorremoved- 0,5bar
MODEL Heat output Heat input Domestic hot
water output Boiler water contents Domestic hot water contents
kW kW kW kW kW Litres Litres
Ferroli F24 23,8 9,7 25,8 11,5 23,8 1,5 0,8
MODEL
Connections Expansion vessel Max. working
pressure
central
heating
circuit
Max.
working
pressure hot
water circuit
12345Capacity Pre-pressurising
value
Ø Ø Ø Ø Ø Litres bar bar bar
Ferroli F24 3/4” 1/2” 3/4” 1/2” 3/4” 7 1 3 6
MODEL Main injectors (mm) Gas flow rates to main burners
for central heating Gas valve
Ø1/2
G20 - NG G31 -LPG G20 - NG G31 -LPG
ØØ m
3
/h kg/h
Ferroli F24 12x1,30 12x0,77 2,73 2,00 H. V K4105G
MODEL
Gas supply pressures
working Gas pressure at main burner for central heating Safety valve
G20 G31 G20 G31
min. m min. m
mbar mbar mbar mbar mbar mbar bar
Ferroli F24 20 37 2,5 11,8 7,8 36,0
MODEL
Domestic hot
water production
with ∆t 30 °C
Domestic hot
water production
with ∆t 35 °C
Max. working
pressure domestic
hot water Protection
level Weight
G20 G31
l/min. l/min. mbar mbar kg
Ferroli F24 11,3 9,7 11,8 36,0 IP44 38
TechnicalData

FERROLI F24
6
2.03 Boiler water flow diagram
OUT
IN
MIN
AIR
IN
AIR
IN
FLUE
OUT
C.H.
OUT D.H.W. OUT GAS IN D.H.W. IN C.H. IN
Fig. 3
2.02 Boiler maincomponents
Key
5Room sealed compartment
7Gas inlet
8Domestichot water outlet
9Domestichot water inlet
10 Central heating flowoutlet
11 Central heating return inlet
14Safetyvalve
16Fan
19Combustion chamber
20 Burner assembly
21Maininjector
22 Burner
26Combustion chamber insulation
27Copper heat exchanger for central heating and
domestichot water
28Fluecollector from heat exchanger
32 Central heating pump
34Central heating flowtemperature sensor
36Automaticairvent valve
42 Domestichot water flow
temperature sensor
Fig. 2
43
16
27
50
19
49
28
5
20
21
26
132
90 91
818222
56
IN OUT
MIN
RESET
OFF
ON
05
1234
6
bar
98 63 157 145
°C°C
62
10 8 784 85 44 136
32
36
114
34
14 42 9 11
43 Airpressure switch
44 Gas valve
49Safetyoverheat thermostat
50 Central heating flowlimitthermostat
56Expansion vessel
62 Time clock
63Central heating temperature adjustment
81Ignition electrode
82Sensor electrode
84Primarygas valvesolenoid
85Secondarygas valvesolenoid
90*Fluesampling point
91*Airsampling point
98On/Off/Reset switch
114Lowwater pressure cutoff switch
132 Fluegas deflector
136Flowmeter
145Central heating pressure gauge
157Domestichot water temperature adjustment
*For use withfluegas analysisequipment

FERROLI F24
7
2.04 Central heating adjustment (not normally required)
To adjust boiler heat input (thusalso regulatingheat output to the central heatingwater) simply adjust the main
burner via the electroniccontrol board (fig. 4and 5and see paragraph 5.04 page 29).
The diagramsindicate the variation in heat output to the water asburner workingpressure isvaried.
Adjustingboiler output to the actual requirementsofthe central heatingsystem will minimise boiler
cyclingthussavingfuel,varyingthe output hasvirtually no effect on the efficiency and combustion
characteristics ofthe boiler.
Diagram of pressures
and outputs with Natural gas
Fig. 4Fig. 5
Diagram of pressures and outputs
with LPG (Propane)
2
3
4
5
6
7
8
9
10
11
12
13
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
8 9 10 11 12 13 14 15 16 17 18 19 20 21
kW
kcal/h
x 1000
mbar
14
kW
kcal/h
X 1000
m
b
ar
18 19 20 21 22 23
5
10
15
20
25
30
35
9 1011121314151617
91011121314 18192015 16 178
2.05Domestichot water variabilitycharacteristics
The temperature ofthe domestichot water can
be varied from 40 to 55°C by adjustingthe boiler
potentiometer.
Diagram of domestichot water production
0 345678910111213141516
39
40
45
50
55
60
65
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Temperature of domestichot water intake 15°C
Flow of domestichot water l/min
Temperature of domestichot water supply°C
Boiler output exchanged kcal/1000
Fig. 6

FERROLI F24
8
Fig. 8
Pressure loss diagram
SIZING OF ADDITIONAL EXPANSION VESSELS:
Deduct from the value given inthe table the 8litre
vessel supplied.
Note:
1. Fill C.H. installation to min. 1.5bar.
2.Expansion vessel must be fitted to central heating
return pipe.
3.The standard 7litre expansion vessel ischarged
to 1bar.
4.The additional expansion vessel should be charged
to 1bar.
SAFETYVALVE
SETTING (bar)
VESSEL CHARGE
PRESSURE(bar)
INITIAL SYSTEM
PRESSURE(bar)
TOTAL WATER
CONTENT ofSYSTEM
3.0
0.51.01.5
1.01.52.01.52.02.0
EXPANSION VESSEL VOLUME(litres)
LITRES
253.56.513.74.710.38.3
507.012.927.59.520.616.5
7510.519.441.314.230.924.8
100 14.025.955.119.041.233.1
12517.532.468.923.751.541.3
15021.038.882.628.561.849.6
17524.545.396.433.272.157.9
200 28.051.8110.238.082.466.2
0.1400.2590.551 0.1900.4120.33
For syst.volumes other than
those givenabove,mult.the syst.
volume bythe factor across
m |h
3
Q
8
7
6
5
4
3
2
1
00.5 1.5 2.512
H
mbar x 100
2.06 Pumpcharacteristics
The pump head available for circulating the water isgiven
infig. 7.
N.B.-The pump isfactoryset at position 3. The pump isa
Grundfos type 15-50UPSseries.
Grundfos Pumpper formance graph
Note -Minimum flowthroughboiler heat exchanger at any
time should not fall below6litres per minute.
Ifthe total volume of water inthe system exceeds 40litres
an additional expansion vessel must be fitted to the central
heating return pipe.
Fig. 7
123Speed settings
ABoilers pressure drop
BAvailable pump head C.H.

FERROLI F24
9
3 INSTALLATIONDETAILS
Gas Safety (Installation & Use) Regulations: 1996
In the interest of safety, it is the lawthat all gas appliances are installedby a competent person in accordance
with the above Regulations, BuildingRegulations/BuildingStandards Scotland, Codes of Practice, current I.E.E.
Regulations andthe byelaws of the LocalWater Undertaking. Failure to comply withthe Regulations may leadto
prosecution;it is yourresponsibility to ensure that the lawis compliedwith.
N.B.For Northern Irelandthe rules in force apply.
Important-If theboiler isto befittedina timberframedbuildingit shouldbefittedin accordancewiththeInstituteof
Gas Engineers document IGE/UP/7.If in doubt advice should be sought fromthe LocalSupplier.
Location of Boiler
The installation of the Ferroli F24 must be on a suitable non-combustible loadbearingwall which will provide
an adequate fixingfor the boiler mountingbracket assembly.The location should be in an area where
the water pipes will not be subjectedto frost conditions.In sitingthe combination boiler the following
limitations must be observed:
The combination boiler may be installedin any roomor internalspace, although particular attention is drawn
to the requirements of the current I.E.E. wiringregulations andin Scotlandthe electricalprovisions of the
buildingregulations applicable in Scotland, with respect to the installation of the combination boiler in a room
or internalspace containinga bath or shower.
Where a roomsealedappliance is installedin a roomcontaininga bath or shower any electricalswitch
or appliance controlutilisingmains electricity must be situatedso that it cannot be touchedby a person
usingthe bath or shower.
AirSupply
The roomor compartment in which the boiler is installeddoes not require a purpose providedvent when
usingthe standardconcentricflue.
Flue System
The boiler allows the flue outlet to be taken fromthe rear of the boiler, fromeither side or vertically.
Astandardflue length of 0.75metres is provided. Alternative lengths of two or three metres can be supplied
(equivalent to wall thicknesses of up to 565, 1815 and2815mm for rear flues, deduct 91mm plus distance fromside
wall for side outlet flues).It is absolutely essential, to ensure that products of combustion discharging fromthe
terminal cannot re-enterthe building,orenterany adjacent building,throughventilations,windows,doors,
natural airinfiltration orforcedventilation/airconditioning.
Gas Supply
If necessary the localGas supplier should be consulted, at the installation planningstage, in order to establish
the availability of an adequate supply of gas.
An existingservice pipe must not be usedwithout prior consultation with the LocalGas supplier.
Agas meter can only be connectedby the LocalGas supplier, or by a LocalGas suppliers Contractor.
Installation pipes should be fittedin accordance with BS6891-1988.
Appliance inlet workingpressure must be 20mbar MINIMUM, for NGand37mbar minimum for LPG.
Pipeworkfromthe meter to the combination boiler must be of an adequate size.
The boiler requires 2.73m3/h of naturalgas, and2,00 kg/h of LPG.
Do not use pipes of a smaller size than the combination boiler inlet gas connection.
The complete installation must be testedfor gas soundness andpurgedas describedin BS6981-1988.All pipework
must be adequately supported. An isolatinggas valve is providedandshould be fittedon the boiler gas inlet.
Please wait 10 minutes when lightingfromcold before checkinggas rate.Gas pressures shouldbe checkedafter
the boilerhas operatedfor10minutes to reachthermal equilibrium.
WaterSystem
Note -the boileris designedforsealedsystems only andmust NOT be usedon open ventedsystems.

FERROLI F24
10
Fig. 9
Central Heating
Detailed recommendations are given inBS6798, 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. inroof spaces
or ventilated underfloor spaces). Draintaps should be positioned at the lowest point of the system inaccessible
locations to permitthe whole system to be drained down. The draintaps should be inaccordance with
BS2879. Copper tubing to BS2871,Part 1isrecommended for water carrying pipework. Pipework in
horizontal runs should have agradient where possible to facilitate the removal of air. Ensure that the
boiler heat exchanger isnot anatural point for aircollection. Atypical heating system with domestic
hot water circuitisillustrated infig. 9.
Important -Ifthermostaticradiator vales are fitted a bypass must be fittedtoensure a minimumflowrate through
the boiler of6l/min. The bypass should be fitted as far as possible from the boiler.
Make UpWater
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 chargeand pressurise the system
directly, isconditional upon the Local Water Byelaws. Againany such connection must be disconnected after use.
Atypical temporary filling loop isshown infig. 10.
DomesticHot Water
Always fitascale reducer in"hard water areas"(18clarke degrees or over)". A15mm copper connection point
on the boiler for attaching to the mainsupply isprovided. The maximum domesticwater pressure for the
inlet supply is10 bar (145 P.S.I.). Ifthe coldmainssupplyexceeds 5bar (72 P.S.I.), a water governor
or pressure reducing valve must be fittedby the installer into the mains supply inan inconspicuous but
accessible position preferable between 3and 5metres (10-16ft) before the appliance. Such avalve must
be approved by the Water Research Council.
Attention -isdrawn to the Model Water Byelaws.
Fittingsmanufactured from duplex (alpha-beta) brass are
not acceptable for underground use and certainwater
undertakingswill not accept theiruse above ground.
Ensure all pipework isadequately supported
NOTE: Abypass that will ensure aminimum flow rate of
6l/min. at all all time must be fitted as far as possible
from the boiler ifthermostaticradiator valves are fitted
thoughout.
Gas
Cold water Additional expansion
vessel C.H.
Filling
point C.H.
Bypass
Fig. 10
Key
1.Filling point C.H.
2. Temporary connection
3.Cold water supply