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Start-up, calibration and operation of the burner
5.4.2
Maximum gas pressure switch
Adjust the maximum gas pressure switch after having performed
all other burner adjustments with the maximum gas pressure
switch set to the end of the scale (Fig. 36).
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.Minimum gas pressure switch
Adjust the minimum gas pressure switch after having performed
all the other burner adjustments with the pressure switch set at
the start of the scale (Fig. 37).
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.
5.4.3
Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 37) 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.
5.5
Flame signal measurement
Check the flame signal through the parameter 954, as indicated in
Fig. 38. 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
instruction manual.
The display (Fig. 38) shows parameter
954
: flashing on the left.
On the right, the flame’s intensity is displayed as a percentage.
Example:
954: 0.0
5.6
Final checks (with the burner working)
Open the thermostat/pressure switch TL:
Open the thermostat/pressure switch TS:
The burner must stop
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.
The burner must stop in lockout
Switch off the burner and disconnect the voltage.
Disconnect the minimum gas pressure switch connector.
The burner must not start
Cover the UV flame sensor.
The burner must stop in lockout due to firing failure
Make sure that the mechanical locking systems on the differ-
ent adjustment devices are fully tightened.
Fig. 36
D9272
Fig. 37
D9290
S8171
P
V
h
min s
%
Fig. 38
WARNING
After the installation, verify all the safety conditions:
pipe-line leakage, draft, adequacy and stability of
main flame at all allowable firing rates and sudden
changes in firing rate, performance and gas tight-
ness of all safety shut-off valves.
Cover plates, enclosures, and guards must be
mainteined in place at all times, except during
maintenance and servicing.
Summary of Contents for RS 120/EV LN
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