23
220683B
Remove the combustion chamber front, see diagram 6.3.
WARNING. The fan operates on mains voltage,
terminals will become live.
Turn the electrical supply on and check that all remote
controls are calling for heat.
Check that the pump is circulating water through the
system.
To complete the test it is necessary to operate the boiler
without its case, but UNDER ALL OTHER
CIRCUMSTANCES the case must be correctly fitted
and sealed.
Turn the control thermostat knob fully clockwise and the
fan will work.
Note. There will be no sparks at the pilot. Take care and
light the pilot with a match.
Test the pilot supply and connections for gas soundness,
using a suitable leak detection fluid.
Very cold weather may delay the operating sequence.
The pilot rate is preset and must not be adjusted.
The step adjustment screw must not be touched.
The pilot flame length should be as shown in
diagram 6.4.
Turn the control thermostat knob to “O” and isolate the
boiler from the electrical supply.
Fit the combustion chamber front.
Reconnect the ignition lead to the PCB.
Stick the self adhesive arrow indicator to the data label,
against the rating that the boiler is going to be set to, for
future reference. The arrow is in the loose items pack.
Loosen the main burner pressure test point screw and
connect a suitable pressure gauge, see diagram 6.2.
Make sure that any remote controls are calling for heat.
Switch on/connect the electrical supply to the boiler and
heating system, neon 1 will light.
Diagram 6.3
VIEWING
WINDOW
SECURING
SCREW (4)
4138
6 C o m m i s s i o n i n g
Diagram 6.4
SPARK GAP
2 to 4mm
10 to 20mm FLAME LENGTH
NOTE:
PILOT SHIELD
REMOVED FOR
CLARITY
4146
4139
