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28
-Turn control knob 4 (Fig.50) down to
its
minimum
setting.
-Push the power main switch to on (Fig.50)
-The digital display will show water set point
temperature in central heating .
-The fan start and after a few second the
digital led display will show that the ignition
commence.
-NOTES : It maybe necessary to reset the
Digital Timer on boiler (if fitted) to start.
Put the timer to on position (Fig.50)
-The ignition control will automatically have
three attempts , but initially this may be due
to air in the gas supply line.If the burner fails
to light, the digital led display and fan will
stop, and the display will show
the lockout code.
-If necessary push the boiler Reset
button (Fig.50) and the boiler will
restart automatically.
-After the boiler has light , allow to
warm at minimum temperature setting
to purge any air from the system.
-Once the system has been purged of
air turn the control knob 4 Fig.50 to the
desired position.
With leak detection fluid test for gas
soundness of all gas components and
joints.See paragraph 6.14 for regulating
the heating circuit control knob.
6.8
CHECK THE GAS PRESSURE
Check the gas mains pressure at
at the gas valve test nipple
UPSTREAM ( Fig.51 ) with boiler operating
Check with the Local Gas supplier if the
pressure differ significabntly from 20 mbar
G20 (natural gas), 37 mbar G31 (propane)
and 29 mbar G30 (butane)
IMPORTANT :The Gas Valve Throttle
adjuster is required to be sealed with
tamper proof paint after adiustment.
6.9
COMBUSTION CHECK :
If a gas carrying
components has been replaced, the
combustion of the appliance should be
checked as follows.
Remove the front panel of the case.
Ensure the boiler and external controls are
calling for heat. Turn on electrical supply.
Open the Hot water tap at maximum flow rate.
Wait at least five minutes or until the unit has
reached its operating temperature.
Unscrew the test sample screw on flue
manifold (Fig.1 item 8 ) Measured the level of
CO
2
. Check the reading against the
corresponding value in sect.3 TECHNICAL
DATA If adjustment proves necessary
then proceed as follows.
IMPORTANT :
Any adjustement to the
gas valve should only be carried out by a
qualified person
Refer to table 6.10 adjust the maximum level
of CO
2
by turning the Throttle on the gas
valve ( Fig.51).
Anti-clockwise to increase CO
2
Clockwise to decrease CO
2
After any new regulation wait to stabilise
about one minute.
- Replace the sample point screw on the
flue manifold ( Fig.1 item 8)
- Replace the front panel of the case.
RATIO BETWEEN FAN SPEED AND HEAT INPUT
Fig. 52
ELECTRODES POSITION
Once the process of commissioning the boiler
is complete, the commissioning engineer
MUST complete his section in the Benchmark
log book.
Fig. 52B
