Viessmann Vitocal 300 AWO-M-AC 301.A, Installation And Service Instructions Manual

Page: 90 / 152

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Terminals Function Explanation
X3 ■ Power supply terminals
of the control unit "L1"
and auxiliary compo-
nents
■ Switched phase L1:
X3.1, X3.2, X3.3, X3.7,
X3.11, X3.13
Terminals for message and safety connec-
tions
Note
Switched phase can be used for on-site
system components. Observe max. load.
X3.1 Phase switched
X3.2
X3.14
or at exter-
nal exten-
sion H1 Signal "External blocking"
(external blocking of com-
pressor and pumps, mixer
in control operation or
CLOSED)
Note
The system may no longer
be protected against
frost.
Requires zero volt N/O contact:
■ Closed: Blocking enabled
■ Open: No blocking
■ Breaking capacity 230 V~, 2 mA
Note
■ These and further functions, such as
swimming pool water heating, cascade
or external set value default can alterna-
tively be connected via external exten-
sion H1.
Installation instructions "External
extension H1"
■ If a swimming pool water heating facility
is connected to external extension H1,
no other external function can be con-
nected to external extension H1.
X3.6
X3.7
G
Power-OFF Requires zero volt N/C contact:
■ Closed: No blocking (safety chain has
continuity)
■ Open: Blocking enabled
■ Breaking capacity 230 V~, 0.15 A
There must not be a jumper when the
power-OFF contact has been connected.
Installation sequence
Electrical connections in the heat pump control…
(cont.)
5692 875 GB