Checking The Burner Pressure - Baxi Combi 80e Installation And Servicing Instructions

Pressure Test Point
Sealing Screw
Fig. 34
Locknut
Adjuster Tube
Minimum Rate
Adjuster Screw
Spring Clip
Modulator
Fig. 34a
Selector Switch
30° 40° 50° 60° 70° 80°
Power On
Neon
Central Heating
Temperature Control
Fig. 36
24
Gas Valve
2
bar
Fig. 35
Hot Water
Temperature Control
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 controls 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 the reset position
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. Turn a hot water tap on to give a flow rate of at
least 10l/min.
8. The pressure should be :-
NG
Butane
Propane
If not, check that the gas supply pressure is
correct (Natural Gas 20mbar, Butane 30mbar and
Propane 37mbar).
9. The pressure can be adjusted if required.
Pressure
Gauge
10. To check minimum pressure first remove one
of the modulator wires.
Adjusting the Pressure (Fig. 34a)
2
11. Prise apart the spring clip retaining the
bar
modulator. Draw the modulator off the valve.
12. Slacken the adjuster tube locknut. Rotate the
tube until the correct maximum pressure is
achieved. Tighten the locknut.
13. Rotate the minimum rate adjuster screw until
the correct minimum 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.
Commissioning the Boiler

Checking the Burner Pressure

) will illuminate (Fig. 36).
80e 105e
12.2mbar 13.4mbar
28.3mbar n/a
36.2mbar 35.8mbar
). The