Potterton Performa 24i HE Installation And Service Instructions Manual page 26

Pressure Test Point
Sealing Screw
Fig. 34
Plastic
Protection
Cap
Modulator
Wire
Maximum Rate
Adjustment Nut
Minimum Rate
Adjustment Nut
Fig. 35 NOTE: Gas Valve Electrical
Plug/Igniter not shown for clarity
Selector Switch
30° 40° 50° 60° 70° 80°
Reset
Power On
Neon
Central Heating
Temperature Control
Fig. 37
26
Gas Valve
2
bar
Fig. 36
Off
2
On
Preheat
bar
Hot Water
Temperature Control
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 control to maximum and the
selector switch to the OFF position (Fig. 37).
3. Slacken the pressure test point sealing screw (Fig.
34) on the gas valve and connect a pressure gauge.
4. Undo the screws securing the inner door panel. Lift
the panel slightly to disengage it from the studs on
top of the case and remove the panel.
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 Central Heating and
Domestic Hot Water position (
neon ( ) will illuminate (Fig. 37).
7. Turn on a hot water tap 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.
Pressure
Gauge
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.
). The power ON
Publication No. 5111813