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3.8 HEAD AVAILABLE
TO SYSTEM
Residual head for the heating system is
shown as a function of rate of flow in the
graph in fig. 17.
To obtain the maximum head available to
the system, turn off the by-pass by turning
the union to the vertical position (fig. 17/a).
3.9 ELECTRICAL WIRING
OF ZONE HEATING SYSTEMS
When installing a system of this type, use a
separate electrical line to which room ther-
mostats with their local valves will be con-
nected.
Connect micro switches or relay contacts
on terminals 15-16 of the "TA" connector
of the electronic card after removing the
existing jumper (fig. 18).
KEY
TA-TA1 Zone room stat
VZ-VZ1 Zone valve
R-R1 Zone relay
CR-CR1 Relay contact or micro zone valve
600
500
25
400
300
200
100
0
200 400
By-pass inserito By-pass on
"TA" connector
Connettore "TA"
CR
CR
1
By-pass on
By-pass inserito
30-35
By-pass escluso
By-pass off
25
30-35
600 800 1000 1200
FLOW RATE (l/h)
PORTATA (l/h)
By-pass off
By-pass escluso
TA
VZ
R
N
NOTA: I relé vengono impiegati solo nel cas
NOTE: Relays are used only if the area
valves have no microswitches.
ES
PT
GB
GR
RO
RUS
1400
1600
Fig. 17
Fig. 17/a
TA
1
VZ R
1 1
Fig. 18
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