41
BOILER TYPE
UNICA MAX 35C
G
UNICA MAX 40C
H
- Select COMBUSTION OFFSET
RESTORE
- Press OK to confirm.
COMBUSTION OFFSET
RESTORE
RESET
SERVICE
COMBUSTION SELF-CALIBRATION
Function used by the after sales service to make an automatic
combustion curve correction if the CO
2
values (shown in the
technical data) are outside the permitted range.
- Power the boiler electrically by bringing the main switch to
“ON”.
- Set the boiler status to OFF.
- Select TECHNICAL
COMBUSTION CONTROL
SELF-CALIBRATION.
- Set the values to:
RESTORE = use the old curve (if the CO
2
value is too high)
RESET = use the new curve (if the CO
2
value is too low).
This parameter is only available when the system is OFF.
6.18 MAINTENANCE
b
In case where, after the replacement of the electronic
board or the maintenance of the detection electrode or
the burner, the combustion analysis would restore out of
tolerance values, it may be necessary to take action on
the parameter COMBUSTION OFFSET as described in
the section 6.17.
Note:
in case of replacement of the electrode, slight
variations of the combustion parameters can not be
excluded. These data wil return to nominal values after
a few hours of operation.
b
Do not clean the appliance or its parts with inflammable
substances (e.g. petrol, alcohol, etc.).
b
Do not clean panels, painted parts and plastic parts with
paint thinner.
b
Panel cleaning must be carried out only with soapy
water.
Cleaning the siphon
- Disconnect the tubes (
A
) and (
B
), remove the clip (C) and
remove the siphon.
- Unscrew the bottom and top caps, then remove the float.
- Clean the parts of the siphon from any solid residues.
b
Do not remove the syphon float or seal as these items
are integral in preventing the possibility of flue gases
escaping to atmosphere if/when the syphon is devoid of
any condensate fluid.
b
Once the operations have been completed, reassem-
ble the components by operating in the reverse order to
what is described, checking the floating seal and replace
it if necessary. If replacing the float gasket, make sure it
is correctly positioned in its seat (see figure in section).
b
At the end of the cleaning sequence, fill the siphon with
water before restarting the boiler as follows:
- Slowly open the de-aeration valve (8 - fig. 3) and leave
it open until the amount of water contained in the
siphon reaches the maximum level.
- Close the de-aeration valve (8 - fig. 3).
- Check that the condensate siphon connection is tight.
- Check that the system pressure has not dropped
below 1 bar. If necessary, fill the system.
CHECK THAT THE CONDENSATE DRAIN OUTLET
SIPHON CONTAINS WATER, IF IT WAS NOT FILLED
PROCEED AS DESCRIBED ABOVE.
b
At the end of the siphon maintenance operations, it is
recommended to bring the boiler to condensing mode
for a few minutes and to check for leaks from the entire
condensate evacuation line.
A
B
C
Cleaning the air filter
A
- Unscrew the fixing screw
A
and remove the air filter.
- Blow compressed air on the filter to remove any impurities.
- In case of persistent dirt wash with water.
Maintenance of the combustion control system
Maintenance electrode
The detection electrode/ionization sensor has an important
function in the boiler ignition phase and in the maintenance of
optimal combustion; in this context, in the event of replacement,
it is necessary to
always ensure
that it is correctly positioned
and to strictly observe the reference shown in the figure.
detector electrode/
ionisation sensor
flame ignition
electrode
a
Do not clean the electrode with sandpaper or any other
abrasive material.
b
The ‘Iono’ electrode will degrade over a period of
time and continued usage; it is therefore strongly
recommended that it be replaced after 5-years of use; in
order to ensure continued performance and efficiency,
and avoid appliance malfunction.
