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11.0 Commissioning the Boiler
33
© Baxi Heating UK Ltd 2007
OUT
MIN
Pressure Test Point
Sealing Screw
Gas Valve
Fig. 48
Selector Switch
Central Heating
Temperature Control
Hot Water
Temperature Control
2
1
0
4
3
bar
Reset
Fig. 51
Power On
Neon
Pressure Gauge
2
1
0
4
3
bar
Fig. 50
11.2 Checking the Burner Pressure
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 controls to maximum and the
selector switch to the Off position (Fig. 51).
3. Slacken the pressure test point sealing screw on the
gas valve and connect a pressure gauge (Fig. 48).
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 the reset position and hold for 2
seconds to reset the boiler (Fig. 51).
6. Turn the selector switch to the Cental Heating and
Domestic Hot Water position ( ). The power On
neon ( ) will illuminate (Fig. 51).
7. Turn a hot water tap on to give a flow rate of at least
10l/min.
8. The pressure should be :-
NG 12.1mbar
Propane 32.3mbar
If not, check that the gas supply pressure is correct
(Natural Gas 20mbar, and Propane 37mbar).
9. The pressure can be adjusted if required.
10. To check and set minimum pressure first remove
one of the modulator wires.
Adjusting the Pressure (Fig 49)
11. Remove the plastic protection cap from the
pressure adjustment nuts on the valve.
12. The smaller nut (5mm) adjusts minimum pressure
and the larger nut (8mm) maximum pressure.
13. Using a suitable spanner adjust the relevant nut until
the correct pressure is achieved.
14. Once the pressure has been set turn the boiler off
and disconnect the pressure gauge.
15. Tighten the pressure test screw and refit the
modulator to the valve. Reassemble in reverse order.
Fig. 49
Plastic
Protection
Cap
Modulator
Wire
Maximum Rate
Adjustment Nut
Minimum Rate
Adjustment Nut
NOTE: Gas Valve Electrical
Plug/Igniter not shown for clarity.