Maximum Gas Pressure Switch; Minimum Gas Pressure Switch; Flame Signal Measurement; Final Checks (With The Burner Working) - Riello RS 160/EV BLU Installation, Use And Maintenance Instructions

5.5.2

Maximum gas pressure switch

Adjust the maximum gas pressure switch (Fig. 35) after having per-
formed all other burner adjustments with the maximum gas pres-
sure switch set to the end of the scale.
With the burner operating at MAX output, reduce the adjustment
pressure by slowly turning the adjustment dial anticlockwise until
the burner locks out.
Then turn the dial clockwise by 0.8" WC and repeat burner firing.
If the burner locks out again, turn the dial again clockwise by
0.4" WC.
5.5.3

Minimum gas pressure switch

Adjust the minimum gas pressure switch (Fig. 36) after having per-
formed all the other burner adjustments with the pressure switch
set at the start of the scale.
With the burner operating at MAX output, increase adjustment
pressure by slowly turning the relative dial clockwise until the burn-
er locks out.
Then turn the dial anti-clockwise by 0.8" WC and repeat burner
starting to ensure it is uniform.
If the burner locks out again, turn the dial anti-clockwise again by
0.4" WC.
5.6

Flame signal measurement

Check the flame signal through the parameter 954, as indicated in
Fig. 37. The displayed value is expressed in percentage.
The value during the operation must be higher than 24%. If at the
burner start-up the value is higher or equal of 18%, the burner locks
out due to the extraneous light.
For further and specific information, please refer to the specific in-
struction manual. The display (Fig. 37) shows parameter 954:
flashing on the left.
5.7

Final checks (with the burner working)

 Open the control limit operation
 Open the high limit operation
 Rotate the maximum gas pressure switch knob to the mini-
mum end-of-scale position
 Rotate the air pressure switch knob to the maximum end of
scale position
 Switch off the burner and disconnect the voltage
 Disconnect the minimum gas pressure switch
 Cover the UV flame sensor
Make sure that the mechanical locking systems on
the different adjustment devices are fully tightened.
WARNING
20094580
Start-up, calibration and operation of the burner
30
On the right, the flame's intensity is displayed as a percentage.
Example: 954: 0.0
S8171

The burner must stop

The burner must stop in lockout

The burner must not start

The burner must stop in lockout due to firing failure
GB
D9272
D9290
P
V h min s %
Fig. 35
Fig. 36
Fig. 37