5.6 To Range Rate the Boiler C.H. (not required on standard installation)
The boiler can be range rated for an output up to 23.3 kW. When the boiler is supplied it is factory set
at an output 23,3 kW.
Procedure
a. Release the control panel fixing screws (fig. 23) and lower panel.
b. Loosen the screw in the burner pressure test point (fig. 17) and attach a gauge.
c. Ensure C.H./D.H.W. selector switch is set for heating continuous and hot water.
d. Adjust room thermostat to maximum (if fitted).
e. Turn boiler thermostat to maximum.
Fig. 18
Fig. 17
Key
44 Combination gas valve
45 Knob gas valve
46 operator gas valve
47 Modulating regulator (Modureg) gas valve
48 Burner pressure test point
66 Microswitch
158 Gas inlet pressure test point
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!
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. 19) 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.
18).
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.
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