Viessmann BW 301.B06, Installation And Service Instructions Manual

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36
Cross connect PCB (signal and safety connections)
Set the required parameters during commissioning:
See page 55 onwards.
Terminals Function Explanation
F1 Fuse 6.3 A (slow) Note
Observe the total load 1000 W of all connected compo-
nents.
X1 Earth conductor X1.
?
Terminals for earth conductor of all associated system
components
X2 Neutral conductor X2.N Terminals for neutral conductor of all associated sys-
tem components
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
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.
X3.1 Switched phase
X3.2
X3.14 "External blocking" signal: External
blocking of compressor and pumps,
mixer in control mode or CLOSE 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
X3.3
X3.4 Flow switch 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.
X3.6
X3.7
G
Power-OFF Requires floating contact:
■
Closed: No blocking (safety chain continuous)
■
Open: Blocking enabled
■
Breaking capacity 230 V~, 0.15 A
Installation sequence
Electrical connection
(cont.)
5516461
Installation