32
In the fig. 35 the typical connection of the boiler
to C.H. system with two heating zones, of which
one is with motorized mixing valve.
Both, the heating zones are controled by an
outer compensator.
The electrical connections of the heating pumps
and the mixing valve motor must be connected
strictly according to the schema shown in fig. 33.
The temperature sensors will be connected
according to the schema shown in fig. 34.
Remember that all the ELLPREX boilers are
for forced circulation.
It is suggested to adopt a shunt pump "Pr" to
guarantee the circulation through the boiler in
any possible open condition of the mixing valve
(see fig. 34).
The shunt pump “Pr”, which will have a
throughput equal, at least, at 50% of the C.H.
pump and a manometric of of 1m W.G., will
perform also an anticondensation function,
limiting the too cold returns into the boiler.
The hydraulic schemas shown in the figs. 35
& 36 are principle schemas; in case of different
system circuits, contact, please, our after sale
service dept., which will supply you with all the
necessary informations.
3.7 - ELECTRICAL AND HYDRAULIC CONNECTIONS OF C.H.
fig. 35
In a C.H. installation equipped with a D.H.W.
storage tank, the hydraulic schema, shown in
fig. 36, can be used.
Note: Also in this case the remarks made in
the previous paragraph are applicable, i.e.: the
adoption of a shunt pump (Pr).
The electrical connections of the storage tank
loading pump will follow the schema shown in
fig. 33.
3.8 - ELECTRICAL AND HYDRAULIC CONNECTIONS OF C.H.
AND D.H.W. PRODUCTION CIRCUITS
C
P1
P2
Pr
VM2
KF
VF
C
B
P1
P2
Pb
Pr
VM2
SPF
KF
VF
fig. 36
Boiler
C.H. pump for direct zone
PC.H. pump for mixed zone
Shunt pump
Mixing valve
Boiler temperature sensor
Flow temperature sensor
Boiler
Storage tank
C.H. pump for direct zone
C.H. pump for mixed zone
Storage tang loading pump
Shunt pump
Mixing valve
Storage tank temperaturesensor
Boiler temperature sensor
Flow temperature sensor
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