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A flow switch safety valve intervenes, block-
ing the operation of the burner if the boiler
is without water due to the formation of an
air lock in the heat exchanger or if the cir-
culator is not working.
NOTE: If replacing the flow switch valve,
make sure that the arrow stamped on the
valve points in the same direction as the
flow of water.
3.5
SYSTEM AVAILABLE HEAD
The head available for the heating plant is
shown as a function of the flow in graph in
fig. 17.
3.6
MAINS ELECTRICITY
CONNECTION
Use a separate electricity supply to connect
the room stats and relative zone valves or
pumps. The micro or relay contact connec-
tion is made to TA-CR-SE (J2) connector of
the circuit board after having removed the
jumper (fig. 18).
SIME SUPPORT
J2 connector
Connettore J2
KEY
TA-TA1
VZ-VZ1
600
500
400
300
200
100
0
CIRCUITO CON VALVOLE DI ZONA
CIRCUIT WITH ZONE VALVES
L
CR1
CR
TA
VZ
TA
N
NOTA: I relé vengono impiegati solo
NOTE: The relays are only used where
nel caso le valvole di zona siano
the zone valves are not fitted with
prive di micro.
micros.
Zone room stat
Zone gas valve
200
400
600
TA
TA
1
R
VZ
R
1
1
R-R1
Zone relay
CR-CR1
Zone microvalve or relay contact
P-P1
Zone pump
with boiler by-pass
con by-pass
without boiler by-pass
senza by-pass
800
1000
1200
1400
PORTATA (l/h)
FLOW RATE (l/h)
CIRCUITO CON POMPE DI ZONA
CIRCUIT WITH ZONE PUMPS
L
TA
TA1
P1
P
R
N
1600
Fig. 17
R1
Fig. 18
13
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