5858 8
START-UP
For Gas train settings, please refer to Appliance Technical Instructions.
AIR PRESSURE SWITCH “1”
The air pressure switch is set after adjustment have been made. Begin with the switch at the lowest setting. With
the burner working at the minimum output, adjust the dial clockwise, increasing its value until the burner locks
out. Now reduce the value by one set point, turning the dial anti-clockwise.
Check for reliable burner operation. If the burner locks out, reduce the value by a further set point.
OVER PRESSURE SWITCH “2”
The over pressure switch must be set after all other adjustments have been made. its purpose is to cause the
burner to shut down if the combustion chamber pressure increases above normal operational values.
Begin with the switch at the highest setting, with the burner working at the maximum output, adjust the dial anti-
clockwise, decreasing its value until the burner shuts down. Now increase the value by one set point and re-start
the burner. If the burner shuts down due to the pressure surge in the combustion chamber caused by the ignition
gas, check that the start gas rate is less than 25% of the main gas rate. If it is, increase the value on the over
pressure switch by a further half a set point and repeat the test.
NOTE
To comply with the Appliance Standard PREN 1020, the CO value must not exceed 0.1% under normal opera-
tional conditions.
CAUTION
Do not turn the ionization probe, maintain the drawing position; should it be close to the ignition electrode, dam-
age may occur to the control box amplifier.
The right positions of the ionisation probe and of the ignition electrode (as shown in the drawing) is obtainable
by coinciding their insulators planes with sloping planes of the fastening support.
Probe position Ignition electrode position
