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Pressure Test Point
Sealing Screw
Fig. 33
Plastic
Protection
Cap
Modulator
Wire
Maximum Rate
Adjustment Nut
Minimum Rate
Adjustment Nut
Fig. 34
Selector Switch
30° 40° 50° 60° 70° 80°
Power On Neon
Temperature Control
Fig. 36
Gas Valve
bar
Fig. 35
9.0
9.2
1. Turn on the gas and electrical supplies to the
boiler and ensure that all external controls are
calling for heat.
2. Set the temperature control to maximum and
the selector switch to the Off position (Fig. 36).
3. Slacken the pressure test point sealing screw
on the gas valve and connect a pressure gauge
(Fig. 33).
4. Undo the screws securing the inner door panel.
Lift the panel slightly to disengage it from the
studs on top of the case.
5. Turn the selector switch fully anticlockwise
against the spring pressure to position R and hold
for 2 seconds to reset the boiler.
6. Turn the selector switch to the Cental Heating
and Domestic Hot Water position (
power On neon (
7. The pressure should be as quoted in Section
4.0 Technical Data. If not, check that the gas
supply pressure is correct (Natural Gas 20mbar,
Butane 30mbar and Propane 37mbar).
8. The pressure can be adjusted if required.
2
9. To check and set minimum pressure first
remove one of the modulator wires.
Adjusting the Pressure (Fig 34)
Pressure
10. Remove the plastic protection cap from the
Gauge
pressure adjustment nuts on the valve.
11. The smaller nut (5mm) adjusts minimum
2
pressure and the larger nut (8mm) maximum
pressure.
bar
12. Using a suitable spanner adjust the relevant
nut until the correct pressure is achieved.
13. Once the pressure has been set turn the
boiler off and disconnect the pressure gauge.
14. Tighten the pressure test screw and refit the
modulator to the valve. Reassemble in reverse
order.
Commissioning the Boiler
Checking the Burner Pressure
) will illuminate (Fig. 36).
). The
27
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