Viessmann BW 301.A090, Installation And Service Instructions Manual

Page: 65 / 160

65
Signal and safety connections
Terminals
Function Explanation
PE/X1. Earth conductor Terminals for earth conductor of all asso-
ciated system components
LP1.X2.N Neutral conductor Terminals for the neutral conductor of the
heat pump control unit.
Wired at the factory.
LP1.X3.16 Phase L1 Control unit power supply.
Wired at the factory.
LP1 X3.2
LP1 X3.14
or at H1 ex-
ternal ex-
tension Signal "External blocking"
(external blocking of com-
pressor and pumps, mixer
in control operation or
CLOSE)
Note
The system may no longer
be protected against
frost.
Requires floating N/O contact:
■ Closed: Power-OFF enabled
■ Open: No power-OFF
■ Breaking capacity 230 V~, 2 mA
Note
■ These and further external functions,
such as swimming pool water heating,
cascade or external set value default
can alternatively be connected via H1
external extension (see installation in-
structions "H1 external extension").
■ If a swimming pool heating facility is con-
nected to H1 external extension, no oth-
er external function can be connected to
H1 external extension.
LP1 X3.3
LP1 X3.4 Flow switch, well circuit Requires floating contact:
■ Closed: Heat pump operational
■ Open: Heat pump shut down
■ Breaking capacity 230 V~, 0.15 A
There should be no jumper if a flow switch
is connected.
LP1 X3.6
LP1 X3.7
G
Power-OFF Requires floating N/C contact:
■ Closed: No power-OFF (safety chain
has continuity)
■ Open: Power-OFF enabled
■ Breaking capacity 230 V~, 0.15 A
No jumper should be installed if a power-
OFF contact is connected.
Installation sequence
Overview of electrical connections
(cont.)
5848 164 GB
Installation