Immergas EOLO Mini - Safety devices and checks; Automatic system by-pass; System filling unit; Automatic air vent

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STEMkW Special ed 01/08 EOLO Mini kW Special
Technical DocumentationTechnical Documentation
8
4
1
2
3
5
8
EOLO Mini 24 kW Special
EOLO Mini 28 kW Special
6
7
2
Safety devices and checks.
Automatic system by-pass (3).
is device guarantees the circulation of water in the central
heating circuit even when it would be prevented by the high
resistance of the system.
It works between the central heating ow and return, inserted
inside the by-pass tting (4) that connects the pump unit (2)
to the 3-way unit.
System lling unit (7).
is is a valve positioned between the boiler circuit and the
domestic cold water inlet and makes it possible to pressurise
the heating system.
is unit is connected to the d.h.w. ow switch (6) by means
of a threaded tting and to the pump unit (2) by means of
an O ring.
Automatic air vent (1).
It automatically expels gaseous substances from the boiler
circuit.
It is mounted on the circulator ow, directly on the pump
unit (2).
3-bar safety valve (5).
is valve prevents the safety pressure being exceeded in the
primary circuit (3 bar).
It tted on the front of the pump unit (2) and xed on the
outside by means of a fork.
When this valve triggers, water exits from the boiler return
pipe.
Expansion vessel (8).
It compensates for variations in volume as a result of heating
the water which also limits pressure variations.
It has a 6-litre capacity (4.5 useful litres) for the 24 model and
7.5 litres (4.5 useful litres) for the 28 model and a preload
pressure of 1.0 bar.
In the 24 model it is rectangular in shape and located on the
right-hand side of the boiler, by the side of the sealed cham-
ber while, in the 28 model it is circular in shape and located
at the rear of the boiler, behind the sealed chamber; in both
models a copper pipe connects the expansion vessel to the
pump unit (2).