Glow-worm Swift flow 120 Installation Instructions Manual page 23

11.3 Preparation for Lighting
Isolate the boiler from the mains electrical supply at the
external isolator.
Test for soundness and purge air from the gas supply in
accordance with the rules in force in the countries of
destination. Turn on the gas service cock, slot in line
with the length of the cock.
Slacken the burner pressure test point screw and connect
a suitable pressure gauge, see diagram 11.3.
11.4 Initial Lighting of the Pilot
Identify the boiler controls, see diagram 11.1.
Fully push in and hold in gas control knob "D".
Press and release piezo button "E" until the pilot burner
lights, at this stage, air may be present in the gas
components of the boiler and this operation may need to
be repeated. When the pilot burner has lit and the flame
is stable, keep knob "D" fully pushed in for 15 seconds,
then release. The pilot burner should stay alight.
IF THE PILOT FLAME GOES OUT NOW OR AT
ANY TIME, A SAFETY DEVICE PREVENTS
IMMEDIATE RELIGHTING. WAIT 4 MINUTES
BEFORE ATTEMPTING TO RELIGHT.
If the pilot flame goes out on releasing knob "D", repeat
the lighting procedure but now keep knob "D" depressed
for a little longer after the pilot has lit.
If the pilot burner will not stay alight, refer to
"Thermocouple and Overheat Cutoff" in Fault Finding
section of the Servicing Instructions.
The pilot flame size is factory preset and should envelop
the thermocouple to about the size given in diagram
11.4. If the flame size is incorrect, refer to diagram 11.3
and "Pilot Burner" in the Servicing Instructions.
Check for gas soundness of the pilot supply using a leak
detection fluid.
Test the operation of the flame supervision system by
turning knob "D" clockwise to release, to make sure that
it shuts down within 60 seconds, indicated by a "click"
from the valve.
Fit the cover of the inner case, make sure that it is fitted
and seals correctly, using the four screws previously
removed, see diagram 6.2.
Make sure that all hot water draw off taps are closed then
set switch "C" to the "Off" position, see diagram 11.1.
Supplied By www.heating spares.co Tel. 0161 620 6677
1 1 C o m m i s s i o n i n g
23
MULTI-FUNCTIONAL
CONTROL
BURNER
PRESSURE TEST
POINT SCREW
SPARK GAP
4.5mm to 5.5mm
FLAME
LENGTH
25mm
PILOT FLAME
ADJUSTMENT
SCREW
Diagram 11.3
Diagram 11.4
220674B