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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 59) and the sealed chamber lid.
• Loosen the internal screw 32 (Fig. 7.8) 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. 30 or pag. 34 (gas pres-
sures at the burner), accordingly with the
model of boiler installed.
• Check the maximum gas flow at the gas
meter and compare the value indicated in
the sections "Technical Data" on pag. 30
or pag. 34 (gas rate), accordingly with the
model of boiler installed.
• Switch off the boiler.
• Disconnect the gas modulator coil by re-
- 54 -
COMMISSIONING
moving the electrical connector A (Fig.
7.8).
Fig. 7.8
• Switch on the boiler.
• Check the minimum gas pressure and
compare the value on the gauge with the
value indicated in the sections "Technical
Data" on pag. 30 or pag. 34 (gas pres-
sures at the burner), accordingly with the
model of boiler installed.
• Switch off the boiler and re-connect the
electrical connector A to the modulator
coil.
• Switch on the boiler.
• Check that the boiler lights up uniformly. If
not refer to section "Ignition gas pressure
adjustment" of the Service Manual for the
necessary adjustment procedures.
• Switch off the boiler, turn off the hot water
tap(s) and disconnect the pressure gauge.
• Reassemble the sealed chamber lid and
the front panel of the case (see "Disman-
tling the external panels" to page 59).
If the maximum and minimum gas pres-
sures measured above are not in accord-
ance with the technical data (sections
"Technical Data" section pag. 30 or pag.
34) then adjustment will be necessary. A
full explanation of the gas pressure ad-
32
A
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