Commissioning
Air pressure switch
21
Adjustment Air pressure switch
Connect a pressure gauge to the
indicated measuring points on the
switch (1). Start the boiler at service
mode for minimum load operation (
W1
).
Measure the pressure differential
across the switch, this should be
≈
0.8
mbar. Turn the dial on the switch (2)
counter-clockwise until the end.
Reduce the setting on parameter P17
step by step until the pressure
differential is 0.4 mbar. Slowly turn the
dial on the switch clockwise until the
boiler goes to lockout. Set P17 back to
its original setting!! Reset the lockout.
Restart the boiler and check if the
switch contact closes at 0.4 mbar
(indicator at DW in display of the boiler
controller (3). If required, repeat the
above procedure.
1
2
3