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External 3-way valve wiring diagram.
By setting relay 1 as "3-way external system" it's
possible to obtain on the K1 control the replica-
tion of the 3-way status inside the boiler. Relay
K1 will be energized (by closing contacts 54-56)
when a heating request is active (CH), while it
RELAY BOARD
RELAY BOARD
Phase
Phase
230V Connection terminal board
230V Connection terminal board
230 Vac 50 Hz
230 Vac 50 Hz
power supply
power supply
Fig. 1-2
Wiring diagram with 2 zones.
The control unit is set up for the direct manage-
ment of a maximum of 2 zones, which is carried
out with relay 1 and 2. Relay 1 must be config-
ured as the "Main zone control", whereas relay
RELAY BOARD
RELAY BOARD
230V Connection terminal board
230V Connection terminal board
230 Vac 50
230 Vac 50
Hz power
Hz power
supply
supply
Fig. 1-3
will be at rest (closing contacts 54-55) both with
boiler in stand-by and during DHW operation
(DHW ). The diagram shows as an example
the possible connections of an external 3-way
valve with 230 V power supply: if it's necessary
to use an external 3-way valve on the boiler, the
Very low
Very low
safety
safety
voltage
voltage
3-WAY VALVE
3-WAY VALVE
Phase
Phase
Phase
Phase
Neutral
Neutral
Low voltage connection terminal board
Low voltage connection terminal board
2 must be configured as the "Secondary zone
control". Relay 3 can be used for one of the func-
tions indicated in the boiler instruction booklet.
INTEGRATED P.C.B.
INTEGRATED P.C.B.
Very low
Very low
safety
safety
voltage
voltage
RELAYS K1, K2
RELAYS K1, K2
and K3 CAN BE
and K3 CAN BE
CONFIGURED
CONFIGURED
Low voltage connection terminal board
Low voltage connection terminal board
hydraulic system must be adapted, excluding
the action of the 3-way valve inside the boiler.
In cases where it's necessary to have a signal
corresponding to the boiler's DHW operation,
it's necessary to "add" both the '3-way status in
DHW' and the 'boiler circulator active' signal.
INTEGRATED P.C.B.
INTEGRATED P.C.B.
The CAR
and 44 complying with the polarity and elimi-
nating the X40 jumper. Moreover, it must be set
with On/Off operation and must control zone
1, while the room thermostat controls zone 2.
Zone 2 valve
Zone 2 valve
32
must be connected to terminals 41
V2
Zone 2 room
Zone 2 room
thermostat
thermostat
Zone 1 valve
Zone 1 valve
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