Burner Start-Up; Pressure Switch Adjustment; Air Pressure Switch - Riello RS 50/E Installation, Use And Maintenance Instructions

5.4

Burner start-up

Feed electricity to the burner via the disconnecting switch on the
S
boiler panel.
Close the thermostats/pressure switches, set the parameters on
the RWF 40 regulator.
Please refer to the spacific manual for this operation. Turn the
switch of Fig. 27 to position "ON" and turn the switch of Fig. 27 to
position "LOCAL".
Make sure that the lamps or testers connected to
the solenoids, or indicator lights on the solenoids
themselves, show that no voltage is present. If volt-
age is present, stop the burner immediately and
DANGER
check the electrical wiring. When the burner starts,
check the direction of the motor rotation, as indicat-
ed in Fig. 27.
As the burner is not fitted with a device to check the
sequence of the phases, the motor rotation may be
incorrect. As soon as the burner starts up, go in front
of the cooling fan of the fan motor and check it is ro-
tating anticlockwise.
If this is not the case:
 place the switch of Fig. 27 in position "OFF"
and wait for the control box to carry out the
switch-off phase;
 disconnect the electrical supply from the
burner;
 invert the phases on the three-phase power
supply.
5.5

Pressure switch adjustment

5.5.1

Air pressure switch

The air pressure switch is connected in differential (Fig. 29) and is
activated by both the negative pressure of the air intake and the air
pressure from the fan.
Adjust the air pressure switch (Fig. 28) after having performed all
other burner adjustments with the air pressure switch set to the
min. of the scale.
With the burner operating at low fire, adjust the pressure switch by
slowly turning the relative knob clockwise until the burner locks out.
Then turn the knob counter-clockwise about 20% of the set point
and start-up the burner again to ensure the set point is correct.
If the burner locks out again, turn the knob counter-clockwise a little
bit more.
Start-up, calibration and operation of the burner
D3854
Fig. 28
For the start-up procedure and the parameters
calibration, refer to the specific instruction man-
ual of the LMV37... electronic cam supplied with
WARNING the burner.
OFF ON LOCAL REMOTE
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25
D11969
Fig. 27
Fig. 29
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