Viessmann Vitocal 300-G Series Installation And Service Instructions Manual page 29

Electrical connection
Terminals Function
F1 Fuse 6.3 A (slow)
X1 Earth conductor X1.
X2 Neutral conductor X2.N
X3 Power supply terminals of control
■
unit "L1" and auxiliary components
Switched phase L1:
■
X3.1, X3.2, X3.3, X3.7, X3.11,
X3.13
X3.1 Switched phase
X3.2 "External blocking" signal: External
X3.14 blocking of compressor and pumps,
mixer in control mode or CLOSE
X3.3 Flow switch
X3.4
X3.6 Power-OFF
X3.7
G
(cont.)
?
Explanation
Note
Observe the total load 1000 W of all connected compo-
nents.
Terminals for earth conductor of all associated system
components
Terminals for neutral conductor of all associated sys-
tem components
Terminals for signal and safety connections
Switched phase L1:
Switched phase can be used for on-site system com-
■
ponents.
Observe the total load 1000 W of all connected com-
■
ponents.
Requires floating contact:
Closed: Power-OFF enabled
■
Open: No power-OFF
■
Breaking capacity 230 V~, 2 mA
■
Note
The system may no longer be protected against frost.
■
These and further external functions (e.g. provision of
■
external set values) can alternatively be connected
via the external EA1 extension.
See "EA1 extension" installation instructions
Requires floating contact:
Closed: Heat pump in operation
■
Open: Heat pump shut down
■
Breaking capacity 230 V~, 0.15 A
■
Jumper is used in some devices.
■
No jumper should be installed if a flow switch is con-
■
nected.
Requires floating contact:
Closed: No blocking (safety chain continuous)
■
Open: Blocking enabled
■
Breaking capacity 230 V~, 0.15 A
■
Installation sequence
29