Ensure that system and boiler are water filled and correctly vented.
Shut the gas valve, remove the inlet pressure test point screw on the valve and connect a pres-
sure gauge. Open service cock and check with pressure gauge at inlet pressure point, that
pressure value is as quoted in technical data sheet.
Warning: if pressure value is more than 35 mbar (350 mm. w.c.) it would be necessary to fit
a reducing governor at gas inlet.
FIRST LIGHTING AND BOILER CONTROL
2.13
ROBERTSHAW 1" GAS VALVE
BURNER PRESSURE ADJUSTMENT
PILOT BURNER PRESSURE ADJUSTMENT
To regulate the boiler proceed as follows:
Select the ON-OFF mode.
Turn the boiler thermostat knob to the required temperature setting. Turn on the main
switch and the front burner switch: as soon as gas flows out from front pilot burner, the
ignition electrode shall spark for 10 seconds (check that spark is approx. 5 mm. in length).
The ignition electrode shall stop sparking.
Should the front pilot burner not light in spite of electrode sparking ensure that:
-
gas system is completely purged of air
-
pilot coil of front gas control valve is energised (24Vcc).
Should the front pilot burner light and ignition electrode should continue to spark and if
after a few seconds the ionisation control goes to “lockout”, then check:
-
at the control panel: that the phase is connected to terminal 1 and neutral to terminal 2
-
the ionisation electrode is not broken or incorrectly positioned or malfunctioning
because of humidity
-
installation has been correctly earthed and the earth cable connected to the front pilot
burner is adequately secured.
After 20 seconds of front pilot burner ignition, the main front burner should light.
Should the main front burner not light, ensure that main coil of front gas control valve is
energised (24Vcc) .
Should front pilot flame reduce or fail when main front burner is ignited, ensure that there
is not a consistent pressure reduction, indicated by the pressure gauge. In this case check
for cause of gas rate fall into gas feed pipe and its components.
Turn off the boiler through the front burner switch. Turn off the gas supply and remove the
manometer from the inlet pressure test point and refit test point screw.
23
BURNER COIL