Ferroli Domina Plus F 24-30 E User manual

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DOMINA PLUS F 24-30 E FERELLA EXTRA F 24-30 MEL
Wall-Mounting Gas
Boiler with antifreeze
for tap water
Airtight Chamber, for
Hot Water and Heating
TECHNICAL
MANUAL


EDITION
092002

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
1. Technical characteristics and data ........................................................ 3
1.1 Introduction .............................................................................................................. 3
1.2 Dimensions and connections .................................................................................. 4
1.3 General view and main components ....................................................................... 8
1.4 Technical data table ............................................................................................... 10
2. Hydraulic circuit - heating ................................................................... 11
2.1 H draulic circuit - heating ...................................................................................... 11
2.2 H draulic circuit - tap water ................................................................................... 15
2.3 Gas circuit ............................................................................................................. 17
2.4 Burner unit ............................................................................................................. 21
2.5 Fume circuit .......................................................................................................... 23
2.6 Electrical circuit ..................................................................................................... 27
3. Operation ............................................................................................ 30
3.1 Operating principle ................................................................................................ 30
3.2 Operating diagram................................................................................................. 32
3.3 Control panel ......................................................................................................... 33
3.4 Adjustments........................................................................................................... 35
3.5 Operating parameter adjustment .......................................................................... 38
4. Unit self-diagnosis .............................................................................. 43

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
1. TECHNICAL CHARACTERISTICS AND DATA
1.1 Introduction
Our unit is a high-efficiency heat generator for heating and hot water production running on natural or liquefied
petroleum gas (configurable at the time of installation) and regulated by an advanced microprocessor control
system.
The boiler shell consists of a copper laminar exchanger whose particular shape guarantees high exchange
efficiency under all operating conditions and an open-flue burner equipped with electronic ignition and ionization
flame control.
The boiler is totally sealed off from the installation room the air needed for combustion is drawn from outside
and the flue gases are expelled by a fan. The boiler outfit moreover includes a variable speed circulator,
expansion tank, flow meter, safety valve, filler cock, air pressure switch, water pressure switch, temperature
sensors, safety thermostat and an antifreeze thermostat with the relevant heating elements.
Thanks to the microprocessor control and adjustment system with advanced self-diagnosis, unit operation is
for the most part automatic. The power for heating is automatically governed by the control system according
to the indoor and outdoor characteristics (with an optional outdoor sensor installed), the characteristics of the
building and of its location. The power for hot water is automatically and continually governed to ensure a fast
delivery and comfort under all operating conditions.
The display continuously provides information on the unit's operating status and it is easily possible to obtain
additional information on the sensor temperatures, set-points, etc. or configure them. Any operating trouble
associated with the boiler or system is immediately signalled by the display and, if possible, corrected
automatically.
General Warnings
·Installation and maintenance must be carried out by professionally qualified personnel, according
to current regulations and the manufacturer's instructions.
·Incorrect installation or poor maintenance can cause damage or physical injury. The manufacturer
declines any responsibility for damage caused by errors in installation and use or by failure to
follow the manufacturer's instructions given in the instructions manual.
·Before carrying out any cleaning or maintenance operation, disconnect the unit from the electrical
power supply using the switch and/or the special cut-off devices.
Certification
The CE marking demonstrates that Ferroli gas units conform to the requirements contained in the
applicable European directives.
In particular, this unit complies with the following EU directives
·Gas Appliance Directive 90/396 assimilated with Italian Presidential Decree DPR 15.11.96 no. 661
·Efficiency Directive 92/42 assimilated with Italian Presidential Decree DPR 15.11.96 no. 660
·Low Voltage Directive 73/23 (amended by 93/68)
·Electromagnetic Compatibility Directive 89/336 (amended by 93/68) assimilated with Italian
Presidential Decree DPR 15.11.96 no. 615

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
1.2 Dimensions and connections
Domina Plus F 24 E version
1149560609536
100
Connections axis
720
725
Connections axis 100
270 460
16025
10
175100
15012012070
110
80 80
80
460
12345
Key
1 System delivery
2 Tap water outlet
3 Gas inlet
4 Tap water inlet
5 System return
Top view
Bottom view

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Ferella Extra F 24 MEL version
Key
1 System delivery
2 Tap water outlet
3 Gas inlet
4 Tap water inlet
5 System return
Top view
Bottom view
1149560609536
100
Connections axis
720
725
Connections axis 100
270 460
16025
10
175100
15012012070
110
80 80
80
460
12345

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Key
1 System delivery
2 Tap water outlet
3 Gas inlet
4 Tap water inlet
5 System return
Top view
Bottom view
733
460
430362
189
Connections axis
460
120120110
80
110
8080
36 95 60 60 155 54
4
23 5
1
200
420
189
175
14
Domina Plus F 30 E version

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Ferella Extra F 30 MEL version
Key
1 System delivery
2 Tap water outlet
3 Gas inlet
4 Tap water inlet
5 System return
Top view
Bottom view
460
430
362
189
460
120120110
80
110
8080
36 95 60 60 155 54
4
23 5
1
200
720
189
175
14
733
Connections axis

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
19 Combustion chamber
20 Burner assembly
21 Main nozzle
22 Burner
26 Combustion chamber insulation
27 Copper e changer for heating and
tap water
28 Fume manifold
29 Fume outlet manifold
32 Heating circulator
34 Heating temp. sensor
36 Automatic air vent
42 Tap water temperature sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
56 E pansion tank
63 Heating temperature setting
73 Antifreeze thermostat
74 System filler cock
81 Ignition electrode
82 Detection electrode
84 1st gas valve operator
85 2nd gas valve operator
90 Fume detection point
91 Air detection point
98 Off-On-Reset switch
114 Water pressure switch
132 Fume deflector
136 Flow meter
145 Water gauge
157 Tap water temperature setting
187 Fume diaphragm
R1-R2-R3-R4 Antifreeze heating elements
1.3 General view and main com onents
F 24 E/MEL version
29 43
16
27
19
49
28
5
20
21
26
132
187
90 91
81
8222
56
IN OUT
MIN
R1
R4
36
0
5
1
234
6
145
R2
R3
10 874 784 85 44 136
114
34
14 42 9 11
32
73
98 63 157
RESET
°C °C

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
F 30 E/MEL version
R1
R4
R2
818222
29 43187
0
5
1
234
6
145
20
21
90
16
28
26
19
49
132
5
56
27
91
IN OUT
MIN
GRUNDFOS
74
73
R3
34
10 8 784 85 44 136 14 42 9 11
36
114
32
98 63 157
RESET
°C °C
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
19 Combustion chamber
20 Burner assembly
21 Main nozzle
22 Burner
26 Combustion chamber insulation
27 Copper e changer for heating and
tap water
28 Fume manifold
29 Fume outlet manifold
32 Heating circulator
34 Heating temp. sensor
36 Automatic air vent
42 Tap water temperature sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
56 E pansion tank
63 Heating temperature setting
73 Antifreeze thermostat
74 System filler cock
81 Ignition electrode
82 Detection electrode
84 1st gas valve operator
85 2nd gas valve operator
90 Fume detection point
91 Air detection point
98 Off-On-Reset switch
114 Water pressure switch
132 Fume deflector
136 Flow meter
145 Water gauge
157 Tap water temperature setting
187 Fume diaphragm
R1-R2-R3-R4 Antifreeze heating elements

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
1.4 Technical data table
Gas supply Pmax Pmin
Heating Power (Net Heat Value Hi)
Useful Heating Power 80°C 60°C
Tap Water Heating Power
Powers Pmax Pmin
kcal/h 20,400 8,300
kW 23.8 9.7
kcal/h 20,400 8,300
kW 23.8 9.7
kcal/h 22,200 9,900
kW 25.8 11.5
Dimensions, weights connections
Depth mm 272
Width mm 460
Height mm 760
Tap water
Minimum working pressure in hot water production bar 0.25
Maximum working pressure in hot water production bar 9
Maximum hot water production Dt 30°C l/min 11.3
Maximum hot water production Dt 25°C l/min 13.6
Boiler water content litres 0.8
Expansion tank pre filling pressure bar 1
Expansion tank capacity litres 7
Minimum working pressure in heating bar 0.8
Maximum working pressure in heating bar 3
Maximum working temperature in heating °C 90
Electrical protection rating IP 44
Electrical power supply
Power voltage/frequency V/Hz 230/50
Max electrical power absorbed W 125
Hot water circuit connections inches 1/2
Heating system connections inches 3/4
Gas system connection inches 1/2
Weight kg 38
Heating
Natural Gas delivery (G20) nm3/h 2.73 1.22
DOMINA P US - FERE A EXTRA
Natural Gas main nozzles (G20) mm 12 x 1.30
Pressure at Natural Gas burner (G20) mbar 11.8 2.5
Natural Gas supply pressure (G20) mbar 20.0
LPG delivery (G31) kg/h 2.00 0.89
LPG main nozzles (G31) mm 12 x 0.77
Pressure at LPG burner (G31) mbar 36.0 7.8
LPG supply pressure (G31) mbar 37.0
Safety valve bar 3
Hot water content litres 0.8
24kW 30kW
Pmax Pmin
Pmax Pmin
25,800 10,900
30.0 12.7
25,800 10,900
30.0 12.7
28,500 12,500
33.1 14.5
363
460
760
0.25
9
14.3
17.2
1.5
1
10
0.8
3
90
44
230/50
125
1/2
3/4
1/2
48
3.50 1.53
16 x 1.25
13.0 2.5
20.0
2.60 1.14
16 x 0.75
35.5 7.0
37.0
3
0.8

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
2. PRODUCT FRAMEWORK AND INTERNAL
COMPONENTS
2.1 Hydraulic circuit - heating
Hydraulic diagram for heating
When there is a call for heat, the room thermostat or control system make the burners ignite and the circulation
pump come into operation. The heat contained in the products of combustion is transferred to the water by the
system via the exchanger. For more details on the operating logic, refer to chap.3.
1110
-+
7
89
49
5
34
73
43
56
81
44
32
20
82
27
29-187
16
74
14
114
136
42
R1 R2
R3 R4
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
27 Heat e changer
29 Fume outlet collar
32 Heating circulator
34 Heating temperature sensor
42 Tap water temperature sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
56 E pansion tank
73 Antifreeze thermostat
74 System filler cock
81 Ignition electrode
82 Detection electrode
114 Water pressure switch
136 Flow meter
187 Fume diaphragm
R1-R2-R3-R4 Antifreeze heating elements

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Circulator (230v/50Hz)
Located on the heating circuit return, it is connected directly to the exchanger
via special forks and connected to the system via a threaded brass section. It has
three delivery/head levels (see diagram). Changing the delivery/head changes
the speed of the water flowing through the boiler exchanger and as a result the
temperature difference (DT) between heating delivery and return. Clearly,
increasing the delivery of the circulator decreases DT and vice versa. If it is not
used for a long time, the impeller might "jam" due to debris in the water. With the
front screw it is possible to access the impeller, which can be freed with the aid
of a screwdriver. The connection to the expansion tank and the air separator is
installed on the pump casing.
Chec s
If the pump doesn't work
·Check that the impeller is free to turn by turning the screw on the front with a
screwdriver.
·Check that both the card and the pump connection are powered.
·If there is no power supply, check the card.
·If there is power, change the pump.
Air separator
This is used to expel the air in the heating circuit automatically. On boilers with
a twin heat exchanger, it is located on the pump casing. It is normally accessible
either via the fork or by simply unscrewing it from its seat.
Key
1 - 2 - 3 = Pump selector position
A = Losses of head 24kW version
B = Losses of head 30kW version
mC.A.
5.5
4.5
5
6
4
3
2
1
3.5
2.5
1.5
0.5
0
0 0.25 0.75 1.25 1.75 2.25 2.752.51.50.5 1 2 3
m
3
/ h
B
A
3.2 3.4 3.6 3.8 4
3
2
1

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Expansion tan
It is connected to the pump casing via a pipe with a fork connection. On the 24kW version, it is located above
the pump, while on the 30kW version it is located behind the exchanger, inside the frame. The expansion tank
contains a diaphragm in contact, on one side, with the system water and, on the other side, with the air under
pressure (pre-loaded to 1 bar) inside the tank. By the expansion of the diaphragm and ensuing compression
of the air, the tank compensates for the thermal expansion of the water in the heating system.
Twin Heat Exchanger
The exchanger is a copper laminar assembly. It comprises a thickly finned portion, three circular pipes
containing the heating water and, inside them, another three pipes in the form of a spiral containing the tap water.
The heating water exchanges directly with the burnt gases, while the tap water does not have this kind of
exchange, it receives heat indirectly from the water in the three heating pipes. In this way, the surface of the
coil does not reach very high temperatures so less scale gets formed. In addition, being very small, it makes
the water speed very high over its entire section, making mineral deposits of any kind negligible. The typical
"omega" shape of the finning ensures an even distribution of the heat over all the finning, with consequent
benefits in terms of exchange efficiency and the life of the exchanger. A special surface treatment protects the
exchanger against oxidation and corrosion.
Version 30kW
10 litre
Version 24kW
7 litre

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Hydraulic unit
This is a single piece of brass to which the exchanger
delivery is connected for ease of access. It
accommodates a number of safety and adjustment
components.
The hydraulic unit includes
- safety valve
- water pressure switch
- heating sensor
- filler cock
- tap water sensor
- tap water check valve
Filler coc
This is located between the heating delivery and the tap water outlet. It is not fitted
on the boiler for some markets such as the British and Belgian ones.
Chec valve
This is necessary to ensure no water returns from the heating system to the tap
water circuit.
Safety valve
It opens if the pressure exceeds 3 bars, making boiler operation safer and
protecting it against overpressure. You are strongly recommended not to use this
valve to drain the system; once open, dirt could remain inside it, preventing it from
closing completely.
Water pressure switch
It ensures a minimum pressure for the system. It is normally open (NO) and
closes the contact when the pressure exceeds 0.5 bar. It works on low voltage.

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
2.2 Hydraulic circuit - ta water
Hydraulic diagram for tap water
1110
-+
7
89
43
56
81
44
32
20
82
27
29-187
16
74
14
114
34
136
42
R1 R2
R3 R4
49
5
34
73
When the card receives a signal from the flow meter indicating a tap-water draw of over 2.5 l/min, the boiler starts
working normally for tap water. If heating was in operation, or the pump was anyhow working, the boiler will in
any case give priority to the tap water, stopping the pump. The tap water does not exchange directly with the
products of combustion, but via the heating water in the exchanger, avoiding sudden changes in temperature.
The boiler is equipped with 4 heating elements and an antifreeze thermostat in order to protect the tap water
pipes if the temperature drops under 6°C. The heating elements heat the pipes up to a temperature of 15°C
measured by the thermostat.
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
27 Heat e changer
29 Fume outlet collar
32 Heating circulator
34 Heating temperature sensor
42 Tap water temperature sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
56 E pansion tank
73 Antifreeze thermostat
74 System filler cock
81 Ignition electrode
82 Detection electrode
114 Water pressure switch
136 Flow meter
187 Fume diaphragm
R1-R2-R3-R4 Antifreeze heating elements

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Flow-rate restrictor
This is a diaphragm downstream from the flow meter. Its task is to limit the tap-
water flow rate; the boiler modulates its capacity to keep the tap-water
temperature set by the user, but since the boiler capacity is limited to its rated
capacity, it is necessary to limit the tap-water flow rate to obtain high T.
Flow meter
Located at the cold water inlet, its task is to provide the card with a signal at a
frequency (7 Hz per litre) in direct proportion to the tap-water flow rate. It is
composed of a body (stator) and a rotor inside it. There is a filter on its inlet to
prevent foreign bodies damaging it. It should be remembered that to turn on the
boiler for tap-water operation, the tap-water pressure must be at least 0.25 bars
and the draw flow rate must be greater than 2.5 l/min.
Chec
To check it works properly, you need to make sure the flow rate is at least
2.5 l/min and then test the signal to the electric card with a frequency meter. This
makes it possible to understand whether the problem lies with the flow meter,
incorrect contacts, or the card.
In this case, above the flow-
rate limit m, even though the
boiler is working at its rated
capacity, it is not able to
maintain the set temperature
of 50°C
*
0 345678910111213141516
39
40
45
50
55
60
65
Tap water delivery temperature °C
Tap-water low rate dm /min
Exchanged boiler capacity kcal/h
x1000
3
17
10
12
13
14
15
16
17
18
19
20
21
11
22
23
24
25
26
27
28
29
30
31
18
Tap water inlet temp. 15°C
m
*
24 kW version
30kW version

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Key
5Airtight chamber
7Gas inlet
8Tap water outlet
9Tap water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
27 Heat e changer
29 Fume outlet collar
32 Heating circulator
34 Heating temperature sensor
42 Tap water temperature sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
56 E pansion tank
73 Antifreeze thermostat
74 System filler cock
81 Ignition electrode
82 Detection electrode
114 Water pressure switch
136 Flow meter
187 Fume diaphragm
R1-R2-R3-R4 Antifreeze heating elements
1110
-+
7
89
43
56
81
44
32
20
82
27
29-187
16
74
14
114
34
136
42
R1 R2
R3 R4
49
5
34
73
2.3 Gas circuit
Gas circuit diagram

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
IN OUT
COMMON
25±50V DC
80±110V DC
B
Gas valve
It supplies gas to the nozzles between a minimum and maximum pressure. For
the valve to work correctly, it is necessary for the pressure upstream from it to
be stable and suited to the type of gas being used, while the valve will supply a
regular pressure to the nozzles. The gas valve contains two operators. The
function of the first one is to open or close, while the task of the second one is
to modulate the capacity according to the system's requirements. The signal
comes from the card and is in the form of continuous voltage. The first operator
receives fixed voltage that may be between 80 and 110V DC, for the second
operator the voltage will vary between 25 and 54V DC according to the need of
the main card.
Chec s
If the valve doesn't work
·The only possible check is to see whether gas comes out of the screw "B" at
the rated pressure when setting the boiler on "test" with the boiler at full power
(see "Test Functions" chap. 3.1).
Modulation
The control system governs its boiler capacity so as to keep the delivery temperature constant in accordance
with the settings on the control panel. The nozzle gas pressure is modulated by the valve and specifically via
the 2nd operator. The card provides a change in continuous voltage (between 25 and 54 V DC) according to the
difference between the delivery temperature and the set point.
Chec s
Modulation can be checked in three ways
·Visually, by checking the flame.
·Using a pressure gauge to check the gas pressure downstream from the valve.
·Checking the voltage on the card (X6, 3/4) that should vary between 25 and 55V DC.
Note that with very low pressure upstream from the valve, opening the valve may be slow and the boiler
could shut down due to failed ignition.

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Adjusting burner pressure
Since this unit has flame modulation, there are two fixed pressure settings the minimum and maximum, which
must be as stated in the technical data chart according to the type of gas.
·Connect a suitable pressure gauge to pressure point "B"
downstream from the gas valve.
·Disconnect the pressure compensation tube "F" .
·Take off the protective cap "C".
·Run the boiler in TEST mode (pressing RESET 3 times
consecutively within 5 sec.).
·Set knob 2 on minimum.
·Adjust the minimum pressure with the screw "D", clockwise to
decrease it and anticlockwise to increase it.
·Set knob 2 on maximum (clockwise).
·Adjust the maximum pressure with the screw "E", clockwise to
increase it and anticlockwise to decrease it.
·Reconnect the pressure compensation tube "F".
·Put the protection screw "C" back in.
N.B. The test lasts 5 minutes. It is advisable to open 1 or 2 taps to
get rid of the excess capacity.
C
IN OUT
F
E
B
A
DCOMMON
25±50V DC
80±110V DC
Key
APressure point upstream
BPressure point downstream
CProtection screw
DMinimum pressure adjustment screw
EMaximum pressure adjustment screw
FPressure compensation tube
After checking or
adjusting the pressure,
it is mandatory to seal the
adjustment screw with paint or
a specific seal.
kW
mbar
18 19 20 21 22 23
5
10
15
20
25
30
35
9101112 13 14 15 16 17
8
24 25 26 27 28 29 30 31 32 33 34
G31
PG
G20
Nat. Gas
24 kW version
30kW version

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DOMINA PLUS F 24 - 30 E
FERELLA EXTRA F 24 - 30 MEL
Version - 09.2002
Gas supply conversion
The unit can function with either Natural Gas or LPG and is factory-set for use with one of the two gases, as
clearly shown on the packing and on the unit's dataplate. Whenever a different gas to that for which the unit
is preset has to be used, a conversion kit will be required, proceeding as follows
1 Replace the nozzles at the main burner, inserting
the nozzles specified in the technical data
table, according to the type of gas used.
2 Using the remote control, edit parameter 3 of
the boiler parameter menu.
3 Adjust the burner minimum and maximum
pressures, setting the values given in the
technical data chart for the type of gas used.
4 Apply the sticker, contained in the conversion
kit, near the dataplate as proof of the conversion.