24
OPTIMAX HE PLUS S
Cod. 3540R543 - 08/2012 (Rev. 00)
Setting the Air/Gas Ratio valve
There are two adjustments possible on the air/gas ratio valve, the throttle setting at maximum rate and the offset setting
at minimum rate. If either setting is adjusted the combustion values must be rechecked at both rates.
At Maximum Rate:
Adjust the boiler to maximum rate in section 3.3 Test Mode.
Wait 10 minutes to allow the boiler to stabilize.
Now adjust the
Throttle setting
(
fi
g. 28 - screw
A
) until the CO
2
is at the correct
SETTING LEVEL
(see table 4),
con
fi
rm that the CO/CO
2
ratio is within limits.
NOTE:
ADJUST IN STEPS OF
NO MORE THAN 1/8 OF A TURN
AND WAIT 1 MINUTE AFTER EACH ADJUSTMENT
TO ALLOW THE SETTING TO STABILISE.
In the event that the CO
2
setting level with an acceptable CO/CO
2
ratio cannot be obtained please contact the
helpline number.
Should you require any assistance during the set up procedure call our Technical service helpline
or should you
require a service engineer to visit call our service centre at numbers listed on last page of this manual.
At Minimum Rate:
Adjust the boiler to minimum output and allow the boiler to stabilize.
Now adjust the
offset pressure setting
(
fi
g. 28 - cup
B
) until the CO
2
is at the correct
SETTING LEVEL
(see table
5), con
fi
rm that the CO/CO
2
ratio is within limits.
NOTE: ADJUST IN STEPS OF
NO MORE THAN 1/8 OF A TURN
AND WAIT 1 MINUTE AFTER EACH ADJUSTMENT
TO ALLOW THE SETTING TO STABILISE.
Re-check the Minimum Rate
Turn off the boiler and then turn it back on and put in Test Mode at maximum for 1minute. Reduce to minimum and re-
check the minimum rate output ensuring the CO
2
setting level has remained unchanged and con
fi
rm that the CO/CO
2
ratio is within limits.
In the event that the CO
2
setting level with an acceptable CO/CO
2
ratio cannot be obtained please contact the
helpline number.
Should you require any assistance during the set up procedure call our Technical service helpline
or should you
require a service engineer to visit call our service centre at numbers listed on last page of this manual.
A =
Throttle
B =
Offset adjustment
NOTE:
In the event that an acceptable setting level cannot
be obtained it will be necessary to change the Air/Gas
Ratio Valve.
fi
g. 28 - Opening the casing
3.5 Troubleshooting
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault, the display will
fl
ash together
with the fault symbol (detail 11 -
fi
g. 1) indicating the fault code.
Certain faults cause permanent boiler shutdowns (marked with the letter “A”): to restore operation, press the RESET
button (detail 6 -
fi
g. 1) for 1 second or RESET on the optional remote timer control if installed; if the boiler fails to start,
it is necessary to
fi
rstly eliminate the fault.
other faults (indicated with the letter “F”) cause temporary shutdowns that are automatically reset as soon as the value
returns within the boiler’s normal working range.
1.
2.
3.
1.
2.
