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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.
Fig. 22
Balance tube
Modureg
Gas valve
Test point burner pressure
Gas inlet pressure test point
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 - 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 1
TR1
X4
X6
234
X2
RY1
X1
2AT
230V
50Hz
1
1110
7263512 910
12
P1
X3
6 5
3
4
1
F1
987654321
X8
123456789
X5
1
2
X7
JP4
13
L7
RY2
RY4
JP1
P2
P2P1
MIN
MAX
MIN
MAX
Pressure Minimum Maximum
settings mbar mbar
Natural Gas 3.0 15.0
L.P.G. 6.9 34.5