5
STESkW ed 05/06 EOLO Star 23 kW
Technical Documentation
Technical Documentation
Boiler circulator (1).
e pump works on the primary circuit return and is located
on the brass manifold assembly.
It is connected to the enbloc and primary exchanger by means
of threaded fittings.
e automatic valve vent is housed on the body (2).
Primary exchanger.
is is a water-gas bithermal type blade exchanger with pipes
and fins in copper for the production of hot water for central
heating and domestic use.
(until serial number 3078554) number of fins = 79.
(from serial number 3078555) number of fins = 86.
It therefore works directly on both circuits to which it is con-
nected by pipes with threaded fittings (3) with a flat gasket
seal (4).
e 6 oval pipes it consists of, inside which flows the water of
the central heating circuit, contain an equal number of “cross-
shaped” pipes for the direct transit of domestic hot water (see
illustration below).
ese pipes are plumbed in parallel in groups of three on the
central heating circuit and in series on the d.h.w. circuit.
e overheating safety thermostat (2) is fixed on the side of
the exchanger exit with a fork (1).
e relevant NTC delivery probe is screwed into place on the
central heating delivery pipe (5).
Head flow rate graph.
e available head the appliance is able to guarantee to the
system in the central heating mode depends on the flow rate
which is shown in the following graph where we can see the
characteristic curve with the pump working at second and
top speed.
Head (m H
2
O)
A = Head available to the system at third speed
B = Head available to the system at second speed
Head (kPa)
A
2
1
Domestic
cold
water
inlet
Domestic
hot
water
outlet
Domestic
hot
water
outlet
System
deliv
ery
System
return
Exchanger pipe section
System
central
heating circuit
D.h.w.
circuit
B
Flow rate (l/h)
http://serviceimmergas.ro
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