20
fully to the “PILOT/IGN” position. A spark should be generated at the pilot
while turning. The spark should ignite the pilot.
9.6.6
When pilot ignition has been achieved, keep the control knob depressed
for approximately ten seconds to allow the thermocouple probe to warm up and
then release it. If the pilot does not remain alight, ensure that the air has been
purged, that the pilot orifice is clear and that the thermocouple connections are
sound. Replace the pilot unit if necessary (see servicing section of this manual).
9.6.7
When the pilot is alight and stable, partially depress the knob and turn to
“LOW”. The pilot should then light the main burner at its low setting. There
may be a delay of up to four seconds between the pilot lighting and ignition of
the gas at the main burner. This is normal and is due to the time required to fill
the main burner compartment with sufficient gas for ignition.
9.6.8
With the burner at “LOW”, partially depress the control knob and
gradually turn it anti-clockwise. The burner flames should gradually increase
until the knob reaches the “HIGH” position.
When the above checks have been
completed partially depress the control knob and turn to “OFF”.
9.6.9
Press the “off” switch. The fan should stop and the indicator light
should come on.
9.6.10
If the above checks are satisfactory, continue with the installation. If not,
check the control and ignition circuitry and components as described in the
servicing section of this manual.
9.7
Check Reference Pressure
The appliance is pre-set to give the correct heat input at the inlet
pressure shown in part 1 of this manual. No adjustment is necessary.
Check the burner pressure by fitting a pressure gauge at the test
point. The test point is on the pipe situated below the bottom right
corner of the burner unit (See figure 17). Check the pressure with
the fan on, the appliance alight and set at maximum output.
After checking, turn off the appliance. Remove the pressure gauge
and replace the test point sealing screw. Relight the appliance. Turn
to the maximum output position and test around the sealing screw
for gas soundness with a suitable leak detection fluid (
Do not use a
liquid detection spray See section 9.5 )
.
Figure 17 Pressure test point
