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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 11.8 kW up to 27.9 kW. When the boiler is supplied
it is factory set at the maximum output 27.9 kW.
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
Black cable
White cable
Fig. 22
P1
Burner pressure test point
Gas valve
Modureg
Inlet pressure test point
P2
Fig. 23
901
Pressure
Minimum
settings
Natural Gas
L.P.G.
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 - 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
P2 = D.H.W. temperature (factory set, not to be adjusted)
P1 Adjust with screwdriver!
12
11 10
9 8 7 6 5 4 3 2 1
4
3
2
X1
13
12
10
9
7
6
5
3
P1
X8
Maximum
mbar
mbar
3.0
15.0
6.9
34.5
6
5
4
2
1
X4
X2
9
8
7
6
5
4
X5
2
1
3
2
1
X7
X3
L7
P2
RY1
RY2
JP1
TR1
1
230V
50Hz
3
2
1
1
X6
2AT
F1
RY4
JP4
21
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