MODENA 80 E
24
5.04 Adjusting maximum output for central heating system
(fi g. 28)
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.
N.B.
- when carrying out this operation ensure that the boiler thermostat is set to maximum otherwise
the adjustment will not be accurate.
5.05 Adjusting central heating fl ow temperature
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.
5.06 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.
5.07 Adjusting the central heating fl ow
t
by varying pump fl ow-head
T
he 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
8 Adjusting central heating system pressure
Th
e
pressure of water in the central heating system, read on the control panel pressure gauge, is adjusted
as described in paragraph 3.07 page 19.
N.
B
. -
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 Service Helpline.
5.
0
9 Gas conversion
Th
e
following adjustment and conversion operations must be carried out by competent personnel. FERROLI
Limited accepts no liability for damage to property or personal injury resulting from tampering with the
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 23).
No
t
e
: After converting the boiler from natural gas to liquid gas, fi t the orange plate in the conversion
kit near the data plate.
No
t
e: injector diameters and pressures at the main burner are given in Technical Data (page 5).
Fig. 28
5.03 Adjustment
potentiometers
P1
= C.H. temperature
adjustment
P2
= D.H.W. temperature
adjustment
P3
= C.H. output adjustment
P4
= Ignition gas pressure
adjustment
P5
= Minimum gas pressure
adjustment
+
-
+
-
P2
DHW
+
-
P3
+
-
P5
+
-
P4
P1
CH
