1001
Burner Pressure C.H. and D.H.W.
8.6To 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
Test point burner pressure
Gas valve
Modureg
Fig. 22 | Gas inlet pressure test point |
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 | 1 | 6 | 5 | 4 |
| 2 | 1 |
| 230V |
X1 |
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| X4 |
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| 50Hz |
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| X2 |
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| 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
MIN |
| P1 |
| MAX | MIN | P2 | MAX |
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Pressure |
| Minimum |
| Maximum |
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settings |
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Natural Gas |
| 3.0 |
| 15.0 |
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L.P.G. |
| 6.9 |
| 34.5 |
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13 12 | 10 9 | 7 | 6 | 5 | 3 | 2 | 1 | X5 |
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| 2 | 1 |
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| X3 | X7 |
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L7
P1 | P2 | RY1 |
RY2
JP1
X8
TR1
31
X6
2AT
F1
RY4
JP4 
Fig. 23
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