20008113
28
GB
Start-up, calibration and operation of the burner
5.4.3
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. 34).
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.
5.4.4
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. 35).
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
Final checks (with the burner working)
³
Open the thermostat/pressure switch TL:
³
Open the thermostat/pressure switch TS:
The burner must stop
³
Rotate the maximum gas pressure switch knob to the mini-
mum end-of-scale position.
³
Rotate the air pressure switch knob to the maximum end-of-
scale position.
The burner must stop in lockout
³
Switch off the burner and disconnect the voltage.
³
Disconnect the minimum gas pressure switch connector.
The burner must not start
³
Disconnect the UV flame sensor.
The burner must stop in lockout due to firing failure
³
Make sure that the mechanical locking systems on the differ-
ent adjustment devices are fully tightened.
Fig. 34
D9272
Fig. 35
D9290
Summary of Contents for RS 200/E LN
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