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5. In order to determine the actual control pressure, Proceed as follows:
a) Set the boiler to holiday mode (
the rotary button, to supress any heating demand.
b) Use an electronic pressure gauge, which will allow to
measure a negative pressure (depression). Connect the
pressure gauge pipe on its tip marked with (-).
c) Connect the pressure gauge to the upper measuring
connection of the gas valve.
Caution: Do not forget to open the screw in the nipple!
d) Operate the boiler in chimney-sweeping mode at DHW full
load (PMAX setting) and wait until the fan has reached its
maximum speed.
e) Press key ESC to exit the chimney-sweeping mode PMAX
and read off the highest measured value displayed on the
pressure gauge during the post-operation time of the fan: the
gas valve closes and the burner goes out.
Note: if a heating request remains (antifreeze mode or
DHW demand), the burner will not go out.
6. Read off the highest measured value displayed on the
pressure gauge during the fan post-operation time (burner
off): This is the measured control pressure.
Important: The control pressure should only be measured during the post-operation time of the fan
when leaving chimney-sweeping mode PMAX, when the burner is no longer operating.
7. Compare the measured control pressure to the minimum control pressure given in the table above (Point 4).
•
If the measured control pressure is equal to or higher than this value, the heat exchanger is working properly
and no further step is necessary.
•
If the measured control pressure is lower than the minimum control pressure given in the table above (point
4), go to step 8.
8. Dismantle the burner to determine if it is dirty. If possible, clean the burner using compressed air (Maximum 2 bar).
If this is not possible, the burner must be replaced by a new one.
9. After cleaning or replacing the burner: repeat steps 5 to 7.
10. If this value is lower, the heat exchanger is dirty and needs to be replaced by a new one.
See hereafter: : 3. Spare parts.
Q
) using the MODE key and
5/7
IT2652C-en
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