Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 33

Electrical connection
Plug
sXG
Terminals Function
225.1 Heating circuit pump of the heating
circuit with mixer M2/HC2
M2
r
225.2 Mixer motor control, heating circuit
M2/HC2
M2
Mixer CLOSE signal
225.3 Mixer motor control, heating circuit
M2/HC2
M2
Mixer OPEN signal
Luster terminals (message and safety connections)
Set the required parameters during commissioning:
See page 51 onwards.
Clamps Function
F1 Fuse 6.3 A (slow)
X1 Earth conductor X1.
X2 Neutral conductor X2.N
X3.1 Switched phase
(cont.)
?
Explanation
Connect a temperature limiter in series to restrict the
maximum temperature of underfloor heating circuit (if
installed).
Note
In systems without heating water buffer cylinder the
temperature limiter is connected to X3.2/X3.14 at the
luster terminals: See chapter "Temperature limiter to re-
strict the maximum temperature of underfloor heating
circuit".
Connection values:
Output: 100 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connection values:
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 0.2(0.1) A
■
Connection values:
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 0.2(0.1) A
■
Explanation
Note
Observe the total load 1000 W of all connected compo-
nents.
Terminals for earth conductors of all associated system
components
Terminals for neutral conductors of all associated sys-
tem components
Via control unit ON/OFF switch
Note
Observe the total load 1000 W of all connected compo-
nents.
Installation sequence
33