
2001
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.
Fig. 22
Balance tube
Modureg
Gas valve
Test point burner pressure
Fig. 24
Btu/h x 1000
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
Gas inlet pressure test point
Fig. 23
12
1
TR1
X4
X6
2
3
4
X2
RY1
X1
2AT
230V
50Hz
1
11 10
7
2
6
3
5
12
9
10
1
2
P1
X3
6
5
3
4
1
F1
9 8 7 6 5 4 3 2 1
X8
1
2
3
4
5
6
7
8
9
X5
1
2
X7
JP4
13
L7
RY2
RY4
JP1
P2
4
3
172
2
1
174
63
LED
157
P2
P1
MIN
MAX
MIN
MAX