Ferroli GFN K Technical manual

,
cod. 3540I190 — 10/2007 (Rev. 00)
GFN K
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
INSTRUCTIONS D'UTILISATION, D'INSTALLATION ET D'ENTRETIEN
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ȅǻǾīǴǼȈ ȋȇdzȈǾȈ,ǼīȀǹȉDZȈȉǹȈǾȈ Ȁǹǿ ȈȊȃȉdzȇǾȈǾȈ
UPUTE ZA UPORABU, POSTAVLJANJE I ODRŽAVANJE
INSTRUCğIUNI DE UTILIZARE, INSTALARE ùI ÎNTRETINERE
NAVODILA ZA UPORABO, INSTALIRANJE IN VZDRŽEVANJE

GFN K
30 GB
B
Declaration of conformity
Manufacturer: FERROLI S.p.A.
Address: Via Ritonda 78/a 37047 San Bonifacio VR Italy
declares that this unit complies with the following EU directives:
• Low Voltage Directive 73/23 (amended by 93/68)
• Electromagnetic Compatibility Directive 89/336 (amended by 93/68)
President and Legal Representative
Cav. del Lavoro
Dante Ferroli
BThis symbol indicates "Caution" and is placed next to all safety warnings. Strictly follow
these instructions in order to avoid danger and damage to persons, animals and things.
AThis symbols calls attention to a note or important notice.
cod. 3540I190 - 10/2007 (Rev. 00)
• Carefully read the warnings in this instruction book-
let since they provide important information on safe
installation, use and maintenance.
• This instruction booklet is an integral part of the
product and must be carefully kept by the user for fu-
ture reference.
• If the unit is sold or transferred to another owner or if
it is to be moved, always make sure that the booklet
accompanies the boiler so that it can be consulted
by the new owner and/or installer.
• Installation and maintenance must be carried out by
professionally qualified personnel, according to cur-
rent regulations and the manufacturer's instructions.
• Incorrect installation or poor maintenance can cause
damage or physical injury. The manufacturer de-
clines any responsibility for damage caused by er-
rors in installation and use or by failure to follow the
manufacturer's instructions.
• Before carrying out any cleaning or maintenance op-
eration, disconnect the unit from the electrical power
supply using the switch and/or the special cut-off de-
vices.
• In case the unit breaks down and/or functions poorly,
deactivate it, do not make any attempt to repair it or
directly intervene. Contact professionally qualified
personnel. Any repair/replacement of products must
only be carried out by qualified professional person-
nel using exclusively genuine parts. Failure to com-
ply with the above could affect the safety of the unit.
• Periodical maintenance carried out by qualified per-
sonnel is essential for guaranteeing good operation
of the unit.
• This unit must only be used for the purpose for which
it was designed. Any other use is considered im-
proper and therefore hazardous.
• After removing the packing, check the integrity of the
contents. Packing materials must not be left within
the reach of children as they are potentially hazard-
ous.
• In case of doubt do not use the unit, and contact the
supplier.
• The images shown in this manual are a simplified
representation of the product. In this representation
there may be slight, unimportant differences with the
supplied product.

GFN K
31
cod. 3540I190 - 10/2007 (Rev. 00)
1 Operating instructions .......................................................................................................... 32
1.1 Introduction...........................................................................................................................................32
1.2 Control panel ........................................................................................................................................32
1.3 Turning on and off ................................................................................................................................33
1.4 Adjustments..........................................................................................................................................34
2 Installation.............................................................................................................................. 35
2.1 General Instructions .............................................................................................................................35
2.2 Place of installation ..............................................................................................................................35
2.3 Plumbing connections ..........................................................................................................................36
2.4 Conversion for use with an oil or pellet burner .....................................................................................36
2.5 Electrical connections...........................................................................................................................36
2.6 Connection to the flue ..........................................................................................................................37
3 Service and maintenance...................................................................................................... 38
3.1 Adjustments..........................................................................................................................................38
3.2 Startup..................................................................................................................................................38
3.3 Maintenance.........................................................................................................................................38
4 Technical data and characteristics ...................................................................................... 40
4.1 Dimensions and connections ...............................................................................................................40
4.2 Plumbing circuit ....................................................................................................................................41
4.3 Technical data table .............................................................................................................................42
4.4 Diagrams ..............................................................................................................................................42
4.5 Wiring diagram .....................................................................................................................................43

GFN K
32 GB
cod. 3540I190 - 10/2007 (Rev. 00)
1. Operating instructions
1.1 Introduction
The GFN K is a new boiler in cast iron for heating and domestic hot water production, using solid fuels (coal and wood),
oil (with optional kit) or pellets (with optional kit). The boiler shell consists of elements assembled with nipples; the profile
of the elements is particularly careful and the optimum finning ensures high heat efficiency, performance and consider-
able energy saving. The combustion chamber is specially designed to take large pieces of wood; loading is by means
of the large top door. The combustion chamber is completely wet, to ensure long life and high efficiency. The hot water
tank is equipped with an electric heater to ensure domestic hot water production even in summer.
1.2 Control panel
fig. 1 - Control panel
1On switch
2Summer/Winter switch
3DHW temperature adjustment knob
4Arrangement for oil burner kit thermostat
5Water gauge
6Draught thermostatic control
12 3 54
min
onoff
max
6

GFN K
33GB cod. 3540I190 - 10/2007 (Rev. 00)
1.3 Turning on and off
Fuel
The boiler must be used with coal or natural and untreated wood. Pressed fuels and briquettes can be used, provided
they are entirely in wood. An oil or pellet burner can be installed on the boiler with the special optional conversion kit.
Refer to the instructions supplied with the burner.
BThe burning of waste, plastic or liquids can create poisonous burnt gases with the risk of poisoning, death or
explosion.
• Only use the fuels indicated.
• In the presence of risk of explosion, fire, burnt gases or fumes, put the boiler out of service.
• The boiler must only be operated by adults who have read the instructions and how to use it.
• The user is only authorised to start the boiler, set the temperature, clean and decommission it.
• Make sure unsupervised children keep away from the boiler when it is operating.
• Do not burn flammable liquids or use them to increase boiler performance.
• Clean the boiler surface with non-flammable agents only.
• Do not place flammable objects on or near the boiler.
• Do not store flammable materials (e.g. wood, paper, petroleum, gas oil) in the boiler installation room.
Wood is an extremely heterogeneous fuel for type, moisture content, shape and size. Boiler efficiency also depends on
the type of wood used and its moisture content, as well as by its size and method of loading. Excellent quality woods
are oak, ash, beech, maple and fruit trees except cherry; good quality woods are chestnut and birch; sufficient quality
woods are limewood, poplar and willow. In general, resiniferous woods are mediocre fuels. The higher the moisture con-
tent, the lower the heating power. The use of damp fuels causes a loss of efficiency. Use wood logs dried outdoors and
in the natural state (stored for 2 years with max. humidity of 20%).
Boiler lighting
• Open the bottom door and remove any ash present in the combustion chamber. Close the bottom door.
• Switch on the power to the unit. Turn the lighting switch to ON and the Summer/Winter switch to .
• Turn the thermostatic control knob 6 to the required temperature value.
• Fully open the draught control on the flue.
• Open the top door. Place a little paper and dry kindling on the burner grate.
• Light the fuel and add a few pieces of slightly larger wood.
• Close the door and wait for a first bed of embers to form.
• Open the top door slowly.
• Spread the embers evenly on the burner with a poker.
• After the bed of embers has formed, load small and medium-size pieces of wood or coke coal.
B- Pieces that are too long do not fall regularly, causing empty spaces with the creation of areas of unburnt
wood.
- Pieces that are too short cause uneven air passages, with a decrease in power and efficiency
- Always open the top door slowly in order to prevent puffs and smoke.
- Do not open the bottom door during operation.
- During the loading stage avoid keeping the top door open for long periods.
- In case of operation with reduced performance, distilled gases at low temperature may form, which can cause
smoke poisoning if breathed.
- If dense smoke is visible, do not breathe.
- Make sure the installation room is well-ventilated.
- Clean the boiler and exhaust gas ducts as prescribed.
Boiler shutdown
To shut down the boiler, allow all the fuel to be burned.
Shutdown for short periods
For short shutdown periods, turn the lighting switch to OFF after the fuel has finished and the boiler has cooled.
• Clean the loading door support surfaces and the loading compartment.
• Remove the ashes and clean the combustion chamber.
• Close the ash compartment door and the loading door.

GFN K
34 GB
cod. 3540I190 - 10/2007 (Rev. 00)
Shutdown for long periods
To put the boiler out of service for long periods (e.g. at the end of the cold season), carefully clean the boiler to prevent
corrosion.
BTo avoid damage caused by freezing during long idle periods in winter, it is advisable to drain all water from
the boiler, or add a suitable antifreeze to the heating system, in compliance with that prescribed in sec. 2.3.
1.4 Adjustments
Summer mode
Turn the Summer/Winter switch 2to and the knob 3to the required temperature value. The hot water tank heating
element is activated. The boiler is ready to deliver domestic hot water only, without having to load wood.
BIn Summer mode the circulating pumps are deactivated. The boiler must not be loaded with fuel and lit since
the heat produced may not be properly dissipated.
Winter mode
Turn the Summer/Winter switch to . The hot water tank heating element is deactivated. To deliver heat or domestic
hot water the boiler must be loaded with fuel and lit. Turn the knob 3 to the required domestic hot water temperature
value and the draught thermostatic control knob to the required temperature value.
To prevent condensation in the combustion chamber, it is advisable to turn the adjustment knob to 60°C; turning it to
80°C and adjusting the heating water temperature by means of the mixer valve would be optimum.
Load the combustion chamber with combustible material (paper and wood) and after obtaining a good bed of fire and
embers, add small and medium-size pieces of coke coal: when lit, boiler operation will be automatic.
The only manual operations necessary are:
- Periodical cleaning of the firebox through the front grill, with emptying of the ashpan, opening the bottom door.
- Periodical loading of the firebox with coal coke through the special top door. Remember that with a complete load
of coke coal, operation without reloading varies from a minimum of approx. 4 hours (at nominal output) to a maxi-
mum of approx. 12 hours (at reduced output) with draught control set to a temperature value of between approx. 80°
and 40°C respectively.
- Adjustment of the damper shutter opening in order to adapt the flue draught to the value necessary for balanced
combustion, that is neither too fast nor too slow (e.g. open for normal operation, closed for reduced output, with var-
iable openings at intermediate powers and according to flue draught).
System pressure adjustment
Periodically check that the system is full of water. These checks must be carried out cold, checking the expansion tanks
(open types must have water at the initial level, whereas in closed types the pressure must be equal to or higher than
the initial prefilling pressure).

GFN K
35GB cod. 3540I190 - 10/2007 (Rev. 00)
2. Installation
2.1 General Instructions
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL, IN ACCORDANCE WITH
ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRE-
SCRIPTIONS OF NATIONAL AND LOCAL STANDARDS AND THE RULES OF PROPER WORKMANSHIP.
2.2 Place of installation
The boiler must be installed in a special room with ventilation openings towards the outside in conformity with current
regulations. If there are several burners or extraction units that can work together in the same room, the ventilation open-
ings must be sized for simultaneous operation of all the units. The place of installation must be free of flammable objects
or materials, corrosive gases, volatile substances or dusts that can be sucked by the fan. The room must be dry and
not exposed to rain, snow or frost.
AA space must be provided around the unit for removing the casing and for normal maintenance operations In
particular, make sure there is sufficient room at the front of the boiler for loading fuel.
For installation, proceed as follows:
1. Unpack the boiler.
2. Fit the thermostatic control "H"fig. 2.
3. Fit the draught control "M"fig. 2 and connect the boiler to the flue.
4. Connect the boiler delivery and return to the heating system.
5. Adjust the air inlet door adjustment screw so that in any case there remains an air passage of not more than 1 - 2
mm. With the boiler cold, set the thermostat to 60°. Hook the chain “C“ to the special air inlet door eyelet “D“, ad-
justing its length so that the air passage "L" (fig. 2) is approx. 15 mm for "coke III" and 2 mm for "wood".
fig. 2 - Installation
M
C
D
H
L

GFN K
36 GB
cod. 3540I190 - 10/2007 (Rev. 00)
2.3 Plumbing connections
The heating capacity of the unit must be previously established by calculating the building's heat requirement according
to current regulations. The system must be provided with all the components for correct and regular operation. It is ad-
visable to install on-off valves between the boiler and heating system allowing the boiler to be isolated from the system
if necessary.
BThe safety valve outlet must be connected to a funnel or collection pipe to prevent water spurting onto the floor
in case of overpressure in the heating circuit. Otherwise, if the drain valve is activated and floods the room,
the boiler manufacturer cannot be held liable.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the system to remove residuals or impurities that could affect correct
operation of the unit.
Carry out the relevant connections according to the diagram in cap. 4.1 "Dimensions and connections" and the symbols
given on the unit.
Characteristics of the water system
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO3), use suitably treated water in order to avoid possible
scaling in the boiler. Treatment must not reduce the hardness to values below 15°F (Decree 236/88 for uses of water
intended for human consumption). Treatment of the water used is indispensable in case of very large systems or with
frequent introduction of replenishing water in the system.
Antifreeze system, antifreeze fluids, additives and inhibitors
If necessary, antifreeze fluids, additives and inhibitors can be used only if the manufacturer of these products guaran-
tees that they are suitable for this use and do not cause damage to the boiler exchanger or other components and/or
materials of the unit and system. Do not use antifreeze fluids, additives or inhibitors that are not specific for use in heat-
ing systems and not compatible with the boiler materials and system.
2.4 Conversion for use with an oil or pellet burner
An optional kit is available for use with an oil or pellet burner.
For installation, refer to the instructions contained in the kit.
2.5 Electrical connections
Accessing the electrical terminal block
To access the electrical terminal block 1fig. 3 lift the boiler cover.
fig. 3 - Accessing the terminal block
1

GFN K
37GB cod. 3540I190 - 10/2007 (Rev. 00)
Connection to the electrical grid
BThe unit's electrical safety is only guaranteed when correctly connected to an efficient earthing system exe-
cuted according to current safety standards. Have the efficiency and suitability of the earthing system checked
by professionally qualified personnel. The manufacturer is not responsible for any damage caused by failure
to earth the system. Also make sure that the electrical system is adequate for the maximum power absorbed
by the unit, as specified on the boiler dataplate.
The boiler is prewired and provided with a Y-cable and plug for connection to the electricity line. The connections to the
grid must be made with a permanent connection and equipped with a bipolar switch whose contacts have a minimum
opening of at least 3 mm, interposing fuses of max. 3A between the boiler and the line. It is important to respect the
polarities (LINE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green wire) in making connections to the electrical
line. During installation or when changing the power cable, the earth wire must be left 2 cm longer than the others.
BThe user must never change the unit's power cable. If the cable gets damaged, switch off the unit and have it
changed solely by professionally qualified personnel. If changing the electric power cable, use solely “HAR
H05 VV-F” 3x0.75 mm2 cable with a maximum outside diameter of 8 mm.
2.6 Connection to the flue
The unit must be connected to a flue designed and built in compliance with current regulations. The pipe between the
boiler and flue must be made from material suitable for the purpose, i.e. heat and corrosion resistant. Ensure the seal
at the joints and insulate the entire pipe between boiler and flue, to prevent the formation of condensate.

GFN K
38 GB
cod. 3540I190 - 10/2007 (Rev. 00)
3. Service and maintenance
All adjustment, commissioning and periodical control operations described below must only be carried out by Qualified Per-
sonnel (meeting the professional technical requirements prescribed by current regulations).
FERROLI declines any liability for damage and/or injury caused by unqualified and unauthorised persons tampering with
the unit.
3.1 Adjustments
Secondary air adjustment
The secondary air control device must be set during the commissioning stage.
Adjust the air inlet door adjustment screw so that in any case there remains an air passage of not more than 1 - 2 mm.
With the boiler cold, set the thermostat to 60°. Hook the chain to the special air inlet door eyelet, adjusting its length so
that the air passage "L" (fig. 2) is approx. 15 mm for "coke III" and 2 mm for "wood".
3.2 Startup
BChecks to be made at first lighting, and after all maintenance operations that involved disconnecting from the
systems or operations on safety devices or parts of the boiler.
Before lighting the boiler
• Open any on-off valves between the boiler and the systems.
• Check correct prefilling of the expansion tank
• Fill the water system and make sure that all air contained in the boiler and the system has been vented.
• Make sure there are no water leaks in the system, connections or boiler.
• Check correct connection of the electrical system and efficiency of the earthing system
• Make sure there are no flammable liquids or materials in the immediate vicinity of the boiler
Checks during operation
• Turn the unit on as described in sec. 1.3.
• Check the seal of the water systems.
• Check the efficiency of the flue and air-fume ducts while the boiler is working.
• Check that the water is circulating properly between the boiler and the systems.
• Check the seal of the wood loading and combustion chamber doors.
• Check combustion and correct setting of the secondary air control device.
3.3 Maintenance
Instructions
B- Before carrying out any maintenance operation, disconnect the power to the boiler and wait until it is at room
temperature.
- Never drain (even partially) the water from the system unless absolutely necessary.
- Do not clean the boiler and/or its parts with easily flammable substances (e.g. petrol, alcohol, etc.).
- Do not leave containers of flammable substances in the room where the boiler is installed.
- Do not clean the heating system when the boiler is operating.
- Use tube brushes and aspirators for cleaning; if rags are used, make sure they are not left inside the boiler.
- If the ash is still hot, wear protective gloves.
- Put the ashes in a non-flammable container provided with lid.
Regularly or the end of every period of operation, carefully clean the boiler, and also the flue if necessary. To clean the
boiler, open both cast-iron doors, remove the coal grate then, with a flexible metal tube brush, carefully clean the com-
bustion chamber and the various flueways. Then remove any soot deposited in the ashpan. Also make sure the fume
exhaust pipes and flue are clean and perfectly tight.

GFN K
39GB cod. 3540I190 - 10/2007 (Rev. 00)
Periodical check
To ensure correct operation of the unit over time, have qualified personnel carry out a yearly check, providing for the
following:
• Check and if necessary clean the boiler and flueways as described above.
• Check the state of the burner plates.
• Check the seal of the ash compartment and loading door; replace the seal if necessary.
• The control and safety devices must work properly.
• The fume exhaust circuit must be perfectly efficient.
• The fume ducts must be free of obstructions and leaks
• The water pressure in the cold water system must be about 1 bar; otherwise, bring it to that value.
• The circulating pump must not be blocked.
• The expansion tank must be filled.
• A possible oil or pellet burner (with optional kit) must be checked according to the instructions supplied with it.
BPeriodically (at least once a year) check the magnesium anode. Replace it when necessary.

GFN K
40 GB
cod. 3540I190 - 10/2007 (Rev. 00)
4. Technical data and characteristics
4.1 Dimensions and connections
fig. 4 - Dimensions
10 System delivery
11 System return
36 Automatic air vent
56 Expansion tank
74 System filling cock
97 Magnesium anode
130 Hot water tank circulating pump
178 Hot water tank thermometer bulb
180 Hot water tank
192 Recirculation
209 Hot water tank delivery
210 Hot water tank return
233 Hot water tank drain cock
239 Electrical heating element
275 Heating system drain cock
303 Thermostatic control
742
500
1492
250 250
170 170
651
97
239
178
275
180
74
233
130
36
10
11
209
192
210
56
36
10
11
130
303
209
192
210
252
533 137 171
345
137

GFN K
41GB cod. 3540I190 - 10/2007 (Rev. 00)
4.2 Plumbing circuit
fig. 5 - Plumbing circuit
10 System delivery
11 System return
36 Automatic air vent
56 Expansion tank
74 System filling cock
97 Magnesium anode
130 Hot water tank circulating pump
178 Hot water tank thermometer bulb
180 Hot water tank
192 Recirculation
209 Hot water tank delivery
210 Hot water tank return
233 Hot water tank drain cock
239 Electrical heating element
275 Heating system drain cock
303 Thermostatic control
56
74
233
275
180 97
178
239
303
209
210
192
10
11
36
130

GFN K
42 GB
cod. 3540I190 - 10/2007 (Rev. 00)
4.3 Technical data table
The column on the right gives the abbreviation used on the dataplate.
4.4 Diagrams
Pressure loss
fig. 6 - Pressure loss
Data Unit Value
Nominal heating capacity kW 30.6 (Q)
Nominal heat output kW 19.9 (P)
Efficiency Pn %65
Efficiency class Directive 92/42 EEC -
Max. working pressure in heating bar 3 (PMS)
Max. heating temperature °C 95 (tmax)
Heating water content litres 28
Heating expansion tank capacity litres 10
Heating expansion tank prefilling pressure bar 1
Max. working pressure in hot water production bar 9 (PMW)
Min. working pressure in hot water production bar 0.1
Hot water content litres 100
Protection rating IP X0D
Power supply voltage V/Hz 230V/50Hz
Electrical absorption W 90
Heater electrical absorption W 1000
Empty weight kg 320
Type of unit
PIN CE
14
12
10
8
6
4
2
0
mbar
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
lt/h

GFN K
43GB cod. 3540I190 - 10/2007 (Rev. 00)
4.5 Wiring diagram
Connection wiring diagram
fig. 7 - Connection wiring diagram
Main wiring diagram
fig. 8 - Main wiring diagram
32 System circulating pump (not supplied)
72 Room thermostat (not supplied)
98 Switch
130 Hot water tank circulating pump
143 Hot water tank control thermostat
185 Summer/Winter switch
239 Electrical heating element
LNLN
72
32
130
LN 456789101112131415161718
230V
50Hz
239
19
LN
Fuse
43
21
43
21
1
2
C
143
185
98
T
N
L
43
21
16
21
4
6
34
15
5
C
12
14
13
10
11
12
7
8
9
18
19
F
239
98
230V
50Hz
185
143
130
72
32

FERROLI S.p.A.
Via Ritonda 78/a
37047 San Bonifacio - Verona - ITALY
www.ferroli.it