31
Instruction for the installer
Layout of the electrical connections for zone control systems
Note: The terminal connections 3 and 4 in-
dicated in the diagram refer to the
valve’s internal limit stop, when the
same valve is in the “low tempera-
ture” position.
The microswitch on the 3-way valve closes whilst the room
thermostat is demanding heat when the diverter valve
reaches the “low temperature” position and sends the
request to the boiler.
The 3-way valve has to use the limit switch contact in order
to simulate this type of request.
When the thermostat’s contact (On-Off) is closed, the 3-
way valve opens the high temperature zone and closes
the low temperature zone (controlled by the digital room
controller “Regolafacile”).
With the thermostat’s contact (On-Off) open, the 3-way
valve deviates towards the low temperature zone (the
temperature value can be adjusted with the digital room
controller).
M
3
L
N
TA
4
LT zone
HT zone
Flow
Return
External voltage line
To the terminals 3 and 4 on the Y2 connector
M
3
LT zone
HT zone
Flow
Return
External voltage line
L
N
TA
4
To the terminals 3 and 4 on the Y2 connector
M
3
Low temperature zone
High temperature zone
Boiler flow
Boiler return
Y1
Y2
1L 2N
1
2
3
4
5
6
7
3
4
1
0
2
3
24
18
6
12
Digital room controller
(low temperature
zone controller)
External voltage line
L
N
Room thermostat
(high temperature
zone controller)
ON
OFF
4
Summary of Contents for ALKON R 24
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