Ferroli F24 Installation, Service And User Instructions Manual page 28

5.03 Adjustment
potentiometers
= C H temperature adjustment
P1
. .
= D W
H temperature adjustment
P2
. . .
= C H utput adjustment
P3 o
. .
= n t n as pressure adjustment
P4 o
Ig i i g
M
= n mum as pressure adjustment
P5
i i g
5.04 Adjusting maximum output for central heating system (fi g. 29)
This adjustment must be carried out electronically using the "P3" adjustment screw starting with a cold central
heating system. Connect a pressure gauge to the pressure test point downstream of the gas valve. Rotate the
temperature adjustment screw to maximum then regulate the pressure to the value required, consulting the diagram
(fi gs. 4 and 5 - page 7). Once this operation is complete, start up and shut down the burner two or three times using
the thermostat. Check each time that the pressure values remain as adjusted and that the burner ignites correctly.
Otherwise further adjustment is necessary until the pressure remains stable on this value.
. . hen carrying out this operation ensure that the
the adjustment ill not e accurate.
5.05 Adjusting central heating o
Central heating water temperature is adjusted by rotating the control knob (fi g. 2 - part 63). Rotate the knob clockwise
to increase water temperature, anticlockwise to reduce water temperature. Temperature can be varied from a minimum
of 30°C to a maximum of 85°C. However, we recommend not operating the boiler below 50°C.
5.0 Adjusting room temperature (when a room thermostat is fi tted)
Room temperature is controlled by positioning the room thermostat knob to the required value. The thermostat automatically
controls the boiler, temporarily interrupting the electrical supply subject to the room heat requirements.
5.0 Adjusting the central heating o
The thermal head t (the difference in temperature between the delivery water and return water in the central
heating circuit) must be less than 20° C. This is obtained by varying pump fl ow rate and head using the
multi-speed variator (or switch) on the pump itself. Increasing the pump speed reduces t and vice versa. The
minimum differential must not be less than 11°C.
5.0 Adjusting central heating system pressure
The pressure of water in the central heating system, read on the control panel pressure gauge, is adjusted
as described in paragraph 3.08 page 24.
. . To avoid incurring unnecessary expense, in the event of boiler shut down, check that this is not caused by a lack
of electricity or gas, or low water pressure before calling the Customer Technical ervice Helpline.
5.09 Gas con ersion
The following adjustment and conversion operations must be carried out by competent personnel. FERROLI
Limited accepts no liability for damage to property or
boiler by unauthorised persons.
To convert the boiler from Nat Gas to LPG and vice versa, the main burner injectors must be replaced. Minimum and
maximum pressures must then be adjusted on the gas valve (see Adjustment page 28).
t
o e After con erting the
it near the data plate.
ote injector diameters and pressures at the main urner are gi en in echnical
28
+
-
P5
+
-
P4
temperature
t
y arying pump o
oiler from natural gas to li uid gas
P1
- + CH
oiler thermostat is set to maximum other ise
head
personal injury resulting from tampering with the
t the orange plate in the con ersion
P2
- + DHW
+
-
P3
2
Fig. 9
ata page 5 .