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VM2
P1
P2
VFAS
Pr
FLOW
SENSOR 2 (VFAS)
OUTER
SENSOR (AFS)
ROOM
SENSOR 2 (FBR1)
ROOM
SENSOR 1 (FBR1)
BOILER
SENSOR (KFS)
D.H.W. TANK
SENSOR (SPFS)
KFS
C
2345671
8910
2345
1
IV
II
1
NL1L1'
1
1
1
2
2
2
M
M
2T1T2
43 21
3
21
21 2 1
4321
876 5
10 9
21
VII
I
V
VIII
III
IX
+- L
3
Bus
H
1
FBR1
VFAS
VFAS
AFS
KFS/SPFS
VFAS
3
1
FBR1
DCF
1
2
3
2
1
VI
1
2
T3 T4
In the fig. 31 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. 29.
The temperature sensors will be connected
according to the schema shown in fig. 30.
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. 30).
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. 31
& 32 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. 31
In a C.H. installation equipped with a D.H.W.
storage tank, the hydraulic schema, shown
in fig. 32, 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. 29.
3.8 - ELECTRICAL AND HYDRAULIC CONNECTIONS OF C.H.
AND D.H.W. PRODUCTION CIRCUITS
C
P1
P2
Pr
VM2
KFS
VFAS
C
B
P1
P2
Pb
Pr
VM2
SPFS
KFS
VFAS
fig. 32
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
FLOW
SENSOR 2 (VFAS)
OUTER
SENSOR (AFS)
ROOM
SENSOR 2 (FBR1)
ROOM
SENSOR 1 (FBR1)
BOILER
SENSOR (KFS)
D.H.W. TANK
SENSOR (SPFS)
VM2
P1
P2
VFAS
Pr
Pb
B
SPFS
KFS
C
2345 671
8910
2345
1
IV
II
1
N L1 L1'
1
1
1
2
2
2
M
M
2T1T2
43 21
3
21
21 2 1
4321
876 5
10 9
21
VII
I
V
VIII
III
IX
+- L
3
Bus
H
1
FBR1
VFAS
VFAS
AFS
KFS/SPFS
VFAS
3
1
FBR1
DCF
1
2
3
2
1
VI
1
2
T3 T4
27


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