Technical data

18
Linea 24 & 28
6.5.5 If during the ignition attempt period (10 secs
approx.) the boiler fails to light, the ignition
control circuit will go to lockout. This is indi-
cated by the status LED (14) flashing red
accompanied by a flashing error code 01
shown in the temperature indicator (15). The
gas valve is de-energised, but leaves the fan
and pump running for approximately 2 min-
utes after lockout.
6.5.6 In the event of the boiler going to lockout turn
the mode selector switch to the reset position
for approximately 10 seconds, then back to
the original position. The two main causes of
the boiler going to lockout during commissioning
are electrical supply polarity reversed, or air in
the gas supply. Check polarity and that the gas
supply is completely purged of air, and that
gas is reaching the boiler, then repeat from
6.5.2.
6.6 Checking Burner Pressures
6.6.1 The heat inputs for high and low gas rates are
factory set to the maximum values given in
section 3.6 for domestic hot water and central
heating but it is necessary to check them when
commissioning.
6.6.2 Turn off the main electricity supply. Gain ac-
cess to the interior as instructed in 5.7.2.
6.6.3 Locate the main burner pressure test point
(Fig. 20) and slacken the screw half a turn in an
anti clockwise direction . Attach a suitable U
gauge tube between the test nipple and ma-
nometer (see fig. 23).
IMPORTANT: Before measuring gas pres-
sures it is imperitive that the protective cover
over the gas valve adjustment screw is re-
moved. (Fig. 37)
Turn on electricity supply and fully open a
domestic hot water tap to operate boiler in dhw
mode. Adjust hot water control knob to it's
maximum setting.
Allow boiler to operate for approximately 5
- 10 minutes before checking gas pres-
sures.
6.6.4 The pressure reading for maximum rate should
be:
24 (N/G)
10.1mbar
( plus or minus 1.0mbar)
28 (N/G)
10.1mbar
(plus or minus 1.0mbar)
If the pressure is wrong it should be adjusted
as instructed in 8.23 (N.B. Whenever the
maximum rate is adjusted, check and adjust
the minimum rate too)
6.6.5 Reduce the domestic water flow rate to approx.
3-4 litres/min, turn the domestic control knob
slowly to minimum. The boiler output will
reduce to the minimum setting. If low flame
cannot be established in this way, turn off the
electricity supply and remove one of the grey
wires connecting to the modulator coil on the
front of the gas valve. Switch on the electricity
supply. The boiler will now light at the mini-
mum setting.
6.6.6 When low flame is established, the pressure
reading should be:
24 (N/G)
1.5mbar
(plus or minus 0.15mbar)
28 (N/G)
1.3mbar
(plus or minus 0.13mbar)
If it is different adjustment should be made in
accordance with the instructions in 8.23.
6.6.7 If the grey wire from the modulator coil was
removed to check the minimum setting, turn
off the electricity supply and replace the wire
onto the modulator coil.
Fig.23
U Gauge Tube
Manometer
Gas Valve