Immergas EOLO Star Export Manual page 12

Technical documentation
- OPERATION
The products of combustion, after investing the water-gas exchanger (1), are conveyed to a hood (2) on
top of which the gas extractor (3) is fitted.
Fan operation ensures forced expulsion of the gases and, at the same time, creates a vacuum in the
sealed chamber (6) so the combustion air can be aspirated from outside.
Correct gas extraction is controlled by a special pressure switch (5), the operation of which enables or
prevents the burner from igniting.
- AIR/FLUE SAMPLING TRAPS (7-8)
In the top part of the sealed chamber are two traps
with screw closing. These are accessible from the
front and can be used to sample combustion air (7)
and gases (8).
- SIGNAL PRESSURE POINTS
FLUE PRESSURE SWITCH (9-10)
In the top outer part of the sealed chamber, two
pressure points are located. These feature screw
fastening and make it possible to measure the signal
at the ends of the flue pressure switch (5).
The negative pressure point (10) is connected to a
"Y" pipe (11) which in turn is connected to the
negative pressure point of the flue pressure switch
(5) and to the pressure point positioned at the
outlet of the venturi pipe (12) fitted in the end of
the fan exhaust.
The positive pressure point (9) is connected directly
inside the sealed chamber.
STES ed. 07/01
FLUE GAS CIRCUIT
10
Technical documentation
EOLO STAR