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21
COMMISSIONING
Manual No. 405/0101
COMMISSIONING - PAGE 21
2.
Check the ignition sequence
With the gas supply isolated check the ignition sequence as follows:
a.
Set the test switch on the top of the control box to 1 (on) and check that all system controls are calling for heat.
b.
Switch on the electricity supply and turn the boiler thermostat fully clockwise [
]. The automatic ignition sequence
will start. The fan will start and after a purge period of about 10 seconds a click will be heard indicating that the start
gas solenoid has opened, the ignition sparks will also be heard. The ignition sparks continue until the pilot is lit. As
the gas supply is not yet turned on the ignition sparks will continue until either the electricity supply is switched off or
the boiler thermostat is turned off (fully anticlockwise [
]).
c.
Turn the boiler thermostat fully anticlockwise (
) to terminate the ignition sequence.
3.
Check the pilot flame and test the pilot supply for gas soundness
a.
Ensure that the gas and electricity supplies are on, the boiler thermostat is turned fully anticlockwise (
) and the
test switch on the top of the control box is set to 1 (on).
b.
Turn boiler thermostat fully clockwise (
). The unit will go through the ignition sequence. The pilot will light and a
second or so after the pilot has lit the main gas solenoid will open and the main burner will light.
c.
Check that the flame (35 to 40 mm long) envelops the electrode and extends 10 mm past it.
The pilot throttle is factory set fully open (turning the throttle clockwise reduces the flame).
d.
Test the pilot supply connections at the gas valve and pilot assembly for gas soundness using a suitable leak
detecting fluid.
e.
Turn the boiler thermostat fully anticlockwise (
).
4.
Test the main burner supply for gas soundness
a.
Ensure that the gas and electricity supplies are on, the boiler thermostat is turned fully anticlockwise (
), the test
switch on the top of the control box is set to 1 (on) and check that all system controls are calling for heat.
b.
Turn the boiler thermostat fully clockwise (
). The unit will go through the automatic ignition sequence and the
pilot will light. A second or so after the pilot is lit the main gas solenoid will open and the main burner will light.
c.
Test the main burner manifold connection at the gas valve for gas soundness using a suitable leak detecting fluid.
5.
Check the main burner setting pressure
After the main burner has been alight for 10 minutes:
a.
Turn the boiler thermostat fully anticlockwise (
). Remove the burner setting pressure test point screw on the gas
valve and connect a pressure gauge.
b.
Turn the boiler thermostat fully clockwise (
) and check the burner setting pressure.
Turn the adjusting screw clockwise (
) to decrease the setting pressure.
The adjusting screw is covered by a plastic cap, carefully prise this off with a suitable screwdriver and replace after
adjusting the pressure.
Note:
The boiler is factory set to the maximum input. See Technical Data, page 4, for the boiler ratings and setting
pressures.
c.
Turn the boiler thermostat fully anticlockwise (
), disconnect the pressure gauge and replace the pressure test
point screw. Turn the boiler thermostat fully clockwise (
) to light the main burner and test for gas soundness
around the pressure test point screw using a suitable leak detecting fluid. Turn the boiler thermostat fully
anticlockwise (
) to turn the boiler off.
6.
Check that the arrow on the data label (positioned on the left hand side of the chassis next to the gas valve) is against
the correct boiler rating.
7
.
For a new boiler, check the water system then balance and adjust the by-pass as described in sections 4.4 and 4.5
before replacing the inner case front panel and expansion vessel.
8.
Switch off the electricity supply to the boiler.
9
.
Set the test switch to O (off) if a programmer is used.
Note:
The pilot burner is turned off every time the main burner is off. The ignition sequence is automatically activated
when the boiler thermostat requires heat. The boiler is fitted with a neon, see Fig. 28, which will light whenever the
main burner is on. The neon is to be fitted to the case bottom assembly when (re)fitting the case.
