Riello 1135T1, Installation, Use And Maintenance Instructions, Page: 39 / 68

37 20173117 GB
Start-up, calibration and operation of the burner
6.5.3 Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 31) after perform-
ing all the other burner adjustments with the pressure switch set
to the start of the scale.
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise until
the burner stops.
Now turn the knob anticlockwise by 0.2 kPa (2 mbar) and repeat
burner start-up to ensure it is uniform.
If the burner locks out again, turn the knob anticlockwise again by
0.1 kPa (1 mbar).
6.5.4 PVP pressure switch kit
Adjust the pressure switch for the leak detection control (PVP
kit)(Fig. 32) according to the instructions supplied with the kit.
6.6 Final checks (with burner operating)
Tab. O
6.7 Motor lockout
If the motor does not start, it could be because of a thermal relay
intervention due to its incorrect calibration or problems with the
motor or the main power supply, to release press the button of the
thermal relay, see “Calibration of the thermal relay” on pag. 21.
WARNING
1 kPa = 10 mbar
Fig. 31
D3855
Fig. 32
D3855

Open the thermostat/pressure switch TL

Open the thermostat/pressure switch TS

The burner must stop

Turn the gas maximum pressure switch knob to the mini-
mum end of scale position

Turn the air pressure switch knob to the maximum end of
scale position

The burner must stop in lockout

Turn off the burner and cut off the power

Disconnect the minimum gas pressure switch connector

The burner must not start

Disconnect the connector of the ionisation probe

The burner must stop in lockout due to ignition failure
WARNING
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.