Ferroli Domitop HF 24-30 E, Ferella Gold HF 24-30 MEL Technical Manual
Supplied by HeatingSpares247.com
Wall-Mounting Gas
Boiler
Airtight Chamber,
Heating
DOMITOP HF 24 - 30 E
FERELLA GOLD HF 24 - 30 MEL
TECHNICAL
MANUAL
EDITION
09ï2002
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
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. Product framework and internal components..................................... 11
2.1 Hydraulic circuit - heating ...................................................................................... 11
2.2 Hydraulic circuit - tap water via external boiler...................................................... 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 ................................................................................................ 31
3.3 Control panel ......................................................................................................... 32
3.4 Adjustments ........................................................................................................... 32
3.5 Operating parameter adjustment .......................................................................... 33
4. Troubleshooting ................................................................................. 34
2
Version - 09.2002
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
1. TECHNICAL CHARACTERISTICS AND DATA
1.1 Introduction
Our appliance is a high-efficiency heat generator for central heating running on natural gas or LPG
(configurable at the time of installation).
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, safety valve, filler cock, air pressure switch, water pressure switch,
temperature sensor and a safety thermostat.
Thanks to the control and adjustment system, unit operation is for the most part automatic. The power
for heating is automatically governed by the control system according to the indoor characteristics, the
characteristics of the building and of its location.
There are 5 LEDs on the control panel providing information on the units operating status.
General Warnings
Installation and maintenance must be carried out by professionally qualified personnel, according
to current regulations and the manufacturers 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 manufacturers 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
Version - 09.2002
3
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
1.2 Dimensions and connections
Domitop HF 24 E version
Top view
12070 120 150
110
8480 80
460
725
272
249
CONNECTIONS AXIS
CONNECTIONS AXIS
100
760
160100 25 150 25
4
321
Key
1 System delivery
2 Gas inlet
3 System return
4 System filler inlet
4
98
15536 155
Bottom view
114
Version - 09.2002
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
Ferella Gold HF 24 MEL version
70 120 120 150
Top view
110
271
271
762
80
705
135
80
460
80
1602515025100
Top view
1 System delivery
2 Gas inlet
3 System return
4 System filler inlet
Version - 09.2002
15536 155 114
98
123
4
Bottom view
5
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
Domitop HF 30 E version
Top view
120 120
110
202
Ø80 Ø80 Ø80
460
15 430 15
110
692
363
760
36 215 54
155
1
23
77
189
Key
1 System delivery
2 Gas inlet
3 System return
4 System filler inlet
6
1
2
4
Bottom view
175
3
Version - 09.2002
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
Ferella Gold HF 30 MEL version
Top view
110 110120120
200
362
80 80 80
460
362
760
692
13 5
36 155 215 54
189
1543015
175
Key
1 System delivery
2 Gas inlet
3 System return
4 System filler inlet
Version - 09.2002
4
12 3
Bottom view
7
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
1.3 General view and main components
HF 24 E/MEL version
5
28
49
20
21
114
34
29 187 43
22 82 81
56
16
27
50
19
26
36
32
Key
5 Airtight chamber
7 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 exchanger
28 Fume manifold
29 Fume outlet manifold
32 Heating circulator
34 Heating temp. sensor
36 Automatic air vent
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank
63 Heating temperature adjustment
74 Heating system cock
81 Ignition electrode
82 Detection electrode
84 1st gas valve operator
85 2nd gas valve operator
98 Off-On-Reset switch
114 Water pressure switch
145 Water gauge
187 Fume diaphragm
117 4485841410
ON
RESET
OFF
°C
98 63 145
bar
3
4
2
1
5
0
6
DOMITOP - FERELLA GOLD version
8
Version - 09.2002
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
HF 30 E/MEL version
28
49
20
21
114
34
29 187
43
Key
5 Airtight chamber
7 Inlet
5
10 System delivery
11 System return
14 Safety valve
16
16 Fan
19 Combustion chamber
20 Burner assembly
21 Main nozzle
22 Burner
27
50
26 Combustion chamber insulation
27 Copper exchanger
28 Fume manifold
29 Fume outlet manifold
32 Heating circulator
34 Heating temp. sensor
36 Automatic air vent
43 Air pressure switch
22 82
19
26
81
44 Gas valve
56
49 Safety thermostat
50 Heating thermostat
56 Expansion tank
63 Heating temperature adjustment
74 Heating system cock
81 Ignition electrode
36
82 Detection electrode
84 1st gas valve operator
32
85 2nd gas valve operator
98 Off-On-Reset switch
114 Water pressure switch
145 Water gauge
187 Fume diaphragm
10
74
14 784 114485
ON
RESET
OFF
°C
98 63 145
bar
3
4
2
1
5
0
6
DOMITOP - FERELLA GOLD version
Version - 09.2002
9
FERELLA GOLD HF 24 - 30 MEL
Supplied by HeatingSpares247.com
1.4 Technical data table
DOMITOP HF 24 - 30 E
DOMITOP - FERELLA GOLD
Powers Pmax Pmin
Heating Power (Net Heat Value - Hi)
Heating Power (Gross Heat Value - Hi)
Useful heating power 80°C - 60°C
Gas supply Pmax Pmin
Natural Gas main nozzles (G20) mm 12 x 1.30
Natural Gas supply pressure (G20) mbar 20.0
Pressure at Natural Gas burner (G20) mbar 11.8 2.5
Natural Gas delivery (G20) nm
LPG main nozzles (G31) mm 12 x 0.77
LPG supply pressure (G31) mbar 37.0
Pressure at LPG burner (G31) mbar 36.0 7.0
LPG burner (G31) Kg/h 2.00 0.87
Heating
Maximum working temperature in heating °C 90
Maximum working pressure in heating bar 3
Safety valve bar 3
Minimum working pressure in heating bar 0.8
Expansion tank capacity litres 8
Expansion tank pre-filling pressure bar 1
Boiler water content litres 1.5
Dimensions, weights connections
Height mm 760
Width mm 460
Depth mm 272
Weight with packing kg 35
Gas system connection inches 1/2
Filling system connection 1/2
Heating system connection 3/4
Electrical power supply
Max electrical power absorbed W 125
Power voltage/frequency V/Hz 220/50
Electrical protection rating IP 44
kW 25.8 11.2
kcal/h 22,200 9,900
kW 28.7 12.4
kcal/h 24,700 10,700
kW 23.3 9.7
kcal/h 20,000 8,300
3
/h 2.73 1.19
inches
inches
24 KW
30 KW
Pmax Pmin
33.1 14.5
28,500 12,500
36.8 16.1
31,600 13,800
30.0 12.7
25,800 10,900
Pmax Pmin
16 x 1.25
20.0
11.8 2.5
3.50 1.53
16 x 0.75
37.0
35.5 7.0
2.57 1.13
90
3
3
0.8
10
1
1.7
760
460
363
45
1/2
1/2
3/4
125
220/50
44
10
Version - 09.2002
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
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.
29-187
16
49
222
82
20
-
+
5
43
50
56
81
44
Key
5 Airtight chamber
7 Inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
20 Burner assembly
29 Fume outlet manifold
32 Heating circulator
34 Heating temp. sensor
43 Air pressure switch
44 Gas valve
49 Safety thermostat
50 Heating thermostat
56 Expansion tank
74 Heating system cock
81 Ignition electrode
82 Detection electrode
84 1st gas valve operator
114 Water pressure switch
187 Fume diaphragm
222 Copper exchanger
34
114
14
74
10
Version - 09.2002
7
11
32
11
DOMITOP HF 24 - 30 E
Supplied by HeatingSpares247.com
FERELLA GOLD HF 24 - 30 MEL
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 ( T) between heating delivery and return.
Clearly, increasing the delivery of the circulator decreases T 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.
Checks
If the pump doesnt 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.
Key
1 - 2 - 3 = Pump selector position
A = Losses of head 24kW version
m
C.A.
6
5,5
5
4,5
4
3,5
3
2,5
2
1,5
1
0,5
0
3
2
1
0,6 0, 1 1, 1, 1, 1, 2 2, 2, 2,6
B = Losses of head 30kW version
A
B
2,8 3 3,2 3,4 3,6 3,8 40,40,20
Air separator
This is used to expel the air in the heating circuit automatically and is located
on the pump casing. It is normally accessible either via the fork or by simply
unscrewing it from its seat.
m3/h
12
Version - 09.2002
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