5866
6
FIXING OF THE ELECTRICAL WIRES
All the electrical wires, which are to be connected to
the terminal block 4) (fig. 1) shall pass through the fair
leads 3) (fig. 1) as for this scheme.
1- Single phase supply : fair lead Pg 13.5
2- Adjustment thermostat : fair lead Pg 13.5
3- Safety thermostat : fair lead Pg 13.5
4- Gas train : fair lead Pg 13.5,
sheath ø 13
5-2
nd
stage thermostat : fair lead Pg 13.5
6 / 7 - Pre-sheared holes
Further prospective signals or controls can be connected to the burner wiring terminal board by
removing the metal weldnuts from the pre-sheared holes and inserting a commun fair lead for the
passage and the clamping of the leads.
NOTES
- Do not exchange the neutral wire with the phase (avoid the plug-pin connection).
- Carry out a safe earth connection.
- Check the stop of the burner, by opening the boiler thermostat and the burner lock-out, by
disconnecting the lead from the flame probe.
WARNING
When closing the burner on its slide-bars, pull towards the outside the high voltage cable and the
cable of the flame detection probe, till to little tension
BURNER START-UP CYCLE
Air-purge: loosen the screw placed on the
minimal gas pressure switch mounted on the
gas train
.
AIR PRESSURE SWITCH
The air pressure switch 6)(fig. 1) setting shall
be carried out after having set all other adjust-
ments of the burner and the air pressure
switch shall be at its lowest set-point.
When the burner is operating, increase the
adjustment pressure by turning - slowly -
clockwise the knob till reaching the burner
lock-out.
Thereafter, turn the knob anticlockwise for 1
mbar and repeat the burner start-up for
checking the regularity: if lock-out intervenes
turn the knob anticlockwise for 0.5 mbar.
Screw
Plug for pressure
Pressure switch
S7506
measure
1 ÷ 10
mbar
Adjustment knob
S7507
