Potterton Performa 30 HE Installation & Service Instructions Manual page 25

9.0 COMMISSIONING
9.2 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. 37).
3. Slacken the pressure test point sealing screw on
the gas valve and connect a pressure gauge
(Fig. 34).
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. 37).
6. Turn the selector switch to the Cental Heating and
Domestic Hot Water position (
neon ( ) will illuminate (Fig. 37).
7. Turn a hot water tap on to give a flow rate of at
least 10 l/min.
8. 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, 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. 35)
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.
Publication No. 5111815
Fig. 34
Plastic
Protection
Cap
). The power On
Modulator
Wire
Fig. 35
Selector Switch
Reset
Power On Neon
Fig. 37
Pressure Test Point
Sealing Screw
Gas Valve
Maximum Rate
Adjustment Nut
Minimum Rate
Adjustment Nut
NOTE: Gas Valve Electrical
Plug/Igniter not shown for clarity
30° 40° 50° 60° 70° 80°
Temperature Controls
2
bar
Fig. 36
Pressure
Gauge
2
bar
25