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6.9.5
Oil pressure switch
Check that the oil pressure switches have intervened correctly.
Turn the adjustment screw (Fig. 41) to check that the pressure
switches have intervened. The check should be carried out by in-
dividually varying the calibration of each pressure switch.
Decreasing the maximum calibration of the oil pressure switch,
the burner should go into lockout.
Increasing the minimum calibration of the oil pressure switch, the
burner should not start.
While the minimum oil pressure switch must be calibrated to ap-
prox. 16-18 bars.
With the control carried out, restore the factory setting of the max-
imum oil pressure switch to approx. 4-5 bar.
Any other pressure values should be adjusted to the burner out-
put.
6.10
Final checks (with burner operating)
Open the thermostat/pressure switch TL
Open the thermostat/pressure switch TS
Turn the gas maximum pressure switch knob to the mini-
mum end of scale position
Turn the air pressure switch to the maximum end of scale
position
Turn the oil maximum pressure switch knob to the mini-
mum end of scale position
Turn the oil minimum pressure switch knob to the maxi-
mum end of scale position
Turn off the burner and cut off the power
Disconnect the minimum gas pressure switch connector
Disconnect the QRI flame sensor wire
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.
WARNING
20099672
Start-up, calibration and operation of the burner
The burner must stop
The burner must stop in lockout
The burner must stop in lockout
The burner must not start
The burner must stop in lockout due to ignition failure
34
GB
20079898
Fig. 41
Tab. L
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