Ferroli optima 2001 VMF7 Installation Instructions Manual page 23

Burner Pressure C.H. and D.H.W.
8.6 To Range Rate the Boiler C.H. (not required for standard installations).
The boiler can be range rated for an output from 9.7 kW (33,000 btu/h) up to 22.6 kW (77,000 Btu/h). When the boiler is supplied
it is factory set at the maximum output 22.6 kW (77,000 Btu/h).
Procedure
a. Release the control panel fixing screws (fig. 30) and lower panel.
b. Loosen the screw in the burner pressure test point (fig. 22) and attach a gauge.
c. Switch on the electricity supply to relight the main burner.
Balance tube
Fig. 22
12 11 10 9 8 7 6 5 4 3 2 1 4 3 2 1
X1 X2
13 12 10 9 7 6 5 3 2 1
X3
P1 P2
JP1
X8
63 157
172
LED
Fig. 24
1 2 3
174
Test point burner pressure
Gas valve
Modureg
Gas inlet pressure test point
6 5 4 2 1
230V
X4 50Hz
9 8 7 6 5 4 3 2 1
X5
3 1
2 1
X6
X7
2AT
L7 F1
RY4
RY1
RY2
JP4
TR1
4
P1
2001
Fig. 23
Note 1 - Modulation is available on central heating, so the
procedures must be carried out while the system is relatively
cold. Recheck boiler thermostat is set to maximum.
d. Adjust the potentiometer P1 on the PCB (fig. 24) in the
control panel until the required burner pressure is obtained
(Anticlockwise to reduce the pressure).
Note 2 - Short circuit 12-13 only on connector X3 on the P.C.B.
- Boiler starts for C.H.
- Waiting time is excluded
Note 3 - The range of inputs with corresponding burner
pressure is given on the Data badge which is situated behind
the top front panel. Further informations is on (fig. 23).
e. With the pressure set, turn off the electrical supply and mark
the set input on the Data badge (with sticker supplied).
Burner Pressure C.H. and D.H.W.
P1 = C.H. range rating to be set on site (if required)
P2 = D.H.W. temperature (factory set, not to be adjusted)
P1 Adjust with screwdriver!
JP1 Not Fitted
JP4 Not fitted
P2
Btu/h x 1000
23