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7.3 Air flow sensors
ATTENTION: Unplup the heating system!
With a torch you can control the sensors. If there isany deposit, clean them as follows:
When dismantling the secondary air fan, you canclean the sensor carefully with a long brush.
If you want to take out the sensor for cleaning, remove the plug and pull out the sensor with great caution.
Now you can clean the sensor with an appropraite brush. Build-in the sensor hermetically afterwards. Then, connect it
correctly and fasten it with a wire strap on the wind tube. After visual ispection and/or cleaning, control the air mass
sensors with an agregate test.
ATTENTION for Model PZ 35:
Don‘t confuse the sensors for primary and secondary air!
7.4 Verify air mass sensors with an aggregate test
At a tension of 15 Volts the primary fan should reach a value of approx. 160-200 (depends on type of system). Information
for Model PZ 35: the set value of the primary air mass sensor first rises to 200 and then changes to zero at full
performance.
With the button
you can now set back the tension to 0,00 V in order to repeat this procedure with the secondary fan.
Consider plug-in direction:
Sensors in the wind tube must face to the external side of the boiler!
When assembling the air mass sensor
and the wind tube, ensure 100 % leak tightness
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