24
ENG
FR
the system, turn off the by-pass by turning
the union to the vertical position (fig. 17/a).
3.7 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 exi-
sting jumper (fig. 18).
NOTE: Relays are used only if the
area valves have no microswitches.
“TA” connector
KEY
TA-TA1 Zone room stat
VZ-VZ1 Zone valve
R-R1 Zone relay
CR-CR1 Relay contact or micro zone valve
Figure 18
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