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Fig. 7.4
7.7
lighting the boiler
Some products incorporate an anti cycling
time delay. It is normal when first switch-
ing the boiler on for the boiler to operate on
heating for a few seconds then switch off.
After 3-4 minutes has elapsed the boiler will
then re ignite and operate perfectly normal-
ly. The ignition delay cycle does not prevent
normal operation of the boiler to provide
d.h.w.
If external controls are fitted (e.g. Timeclock,
room thermostat) ensure they "call for heat".
• Turn on the electricity supply to the boil-
er, switching on the fused spur isolation
switch. The appliance operation light 10
will flash every 4 seconds.
• Turn the function selector 8 as in Fig. 7.5.
The appliance operation light 10 will flash
every 2 seconds.
10
Fig. 7.5
CoMMISSIoNING
Sampling points
Flue exhaust
8
7 6
The boiler will now go through an ignition
sequence and the burner will light.
If during the ignition attempt period the
boiler fails to light, the full sequence control
p.c.b. will go to lockout and the lock-out sig-
nal lamp 6 will appear.
To reset the boiler press and release the
boiler reset button 7.
7.8
Checking the gas pressure at
the burner
This boiler has been factory tested to the
highest quality control standards.
The maximum and minimum gas pres-
sures are already set during this quality
control process however the checking
procedure must be followed to ensure
maximum operating efficiency from the
boiler.
• Remove the front panel of the case (see
section "Dismantling the external panels"
to page 53) and the sealed chamber lid.
• Loosen the internal screw 33 (Fig. 7.6) on
the Outlet Pressure Test Point of the Gas
Valve and connect a pressure gauge us-
ing a suitable hose.
• Set the d.h.w. and c.h. temperature con-
trol knobs to their maximum position. If
external controls are fitted (e. g. Time-
clock, room thermostat) ensure they "call
for heat".
• Switch on the boiler and open at least one
hot water tap fully.
• Check the maximum gas pressure and
compare the value on the gauge with the
value indicated in the sections "Technical
Data" on pag. 24 or pag. 27 (gas pres-
sures at the burner), accordingly with the
model of boiler installed.
- 47 -
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