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5.5
Adjustments before first firing (gas operation)
Adjustment of the combustion head has been illustrated on
page 26.
In addition, the following adjustments must also be made:
open manual valves up-stream from the gas train.
Purge the air from the gas line.
Adjust the min gas pressure switch (Fig. 50 at page 44) to the
start of the scale.
Adjust the max gas pressure switch (Fig. 49 at page 44) to the
upper limit of the scale.
Adjust the air pressure switch (Fig. 48 at page 44) to the zero
position of the scale.
Fit a U-type manometer (Fig. 46) to the gas pressure test point
on the sleeve. The manometer readings are used to calculate
MAX. burner power using the Tab. L at page 34.
Before starting up the burner it is good practice to
adjust the gas train so that ignition takes place in
conditions of maximum safety, i.e. with gas delivery
at the minimum.
CAUTION
5.6
Burner start-up
Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the thermostats/pressure switches.
Turn the switch to position "LOCAL" and turn the switch to position
"OIL" for oil operation and "GAS" for gas operation (Fig. 47).
Make sure that the lamps or testers connected to
the solenoids, or indicator lights on the solenoids
themselves, show that no voltage is present.
DANGER
If voltage is present, stop the burner immediately
and check the electrical wiring.
When the burner starts, check the direction of the
motor rotation, as indicated in Fig. 47.
As soon as the burner starts up, look at the cooling
WARNING
fan of the fan motor and check it is rotating anti-
clockwise.
If this is not the case:
place the switch of Fig. 47 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 inverter output.
NOTE:
for further information, please refer to the specific instruction
of the control box.
20102963
Start-up, calibration and operation of the burner
42
D10092
D11479
GB
Fig. 46
OFF
OIL
GAS
LOCAL
OFF
REMOTE
S8366
S8362
Fig. 47
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