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31
Ferroli F 30 B
Ferroli F 30 B
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:
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.
Limit thermostats
T/Stat
Location
Function
Nominal Operat-
ing Temperature
Circuit
Wiring Colours
Flue gas
safety
thermostat
Secondary
heat
Exchanger
Protects boiler by
stopping ignition
and cuts power
to gas valve
100°C
240V AC
Grey
Grey
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
Protects boiler by
stopping ignition
and cuts power
to gas valve
100°C
240V AC
Grey
Grey
The MFO3 PCB has five diagnostic lights, each light corresponds to a particular function and will light in turn as the
boiler goes though its sequence of operations.
In order, the five lights indicate:
1
Flame On Indicator
2
Boiler Shut down warning
3
Domestic Hot Water circuit ON
4
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.
Summary of Contents for DOMIcompact F 30 B
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