17
20029918
GB
Operation
6.1
Notes on safety for the first start-up
6.2
Adjustments prior to ignition
The following adjustments must be carried out:
open manual valves upline from the gas train.
Bleed the air from the gas line using the screw on the socket
START.
Check the trimmer settings on the control box (Fig. 14).
6.3
Burner start-up
Close the thermostat and switch on the burner's power.
The burner starts up under pre-purging conditions to the START
and the ignition occurs.
If the fan starts up, but no flame appears by the end of the safety
time, the control box allows the start-up programme to be repeat-
ed up to 3 times.
If ignition does not occur upon the third attempt, the burner goes
into lockout mode. Reset and wait for a new start-up attempt.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 5 seconds.
Turn the screw V1 on the gas valve mixer slightly anticlockwise.
Once the burner has ignited, proceed with the global adjustment
of the burner.
6.4
Fan adjustment
Modulation is based on variable-speed technology.
Combustion air delivery can be adjusted by varying the motor's
speed (rpm).
The proportioning gas train delivers the right amount of fuel, de-
pending on the pressure detected in the purging circuit.
Hence the output delivered is adjusted by varying the motor's
speed of rotation.
The speed of the motor can be adjusted by means of three “Trim-
mers” (Fig. 14).
Definition of the adjustment for the fan:
The adjustments are carried out means on three potentiometers
on board of the motor control box.
START
Determine the pover during the start
MIN
Determine the minimum modulation
MAX
Determine the maximum modulation
The adjustment of “MIN” takes place outright at finishing the pre-
purging outlined by the valve opening and by the presence of the
discharge.
The authorisation to the maximum modulation with “MAX” occurs
about 10 sec by the valve opening.
6
Operation
WARNING
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
Check the correct working of the adjustment, com-
mand and safety devices.
min
start max
Fig. 14
D10505
Maximum power
Minimum power
