Viessmann 301.BS090, Installation And Service Instructions For Contractors

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Danger
If system components are not earthed, serious
injury from electric current can result if an elec-
trical fault occurs.
■ Remake all earth connections inside the heat
pump.
■ Heat pump and pipework must be grounded
to the equipotential bonding of the building.
Danger
Incorrect core allocation can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
■ Consult your power supply utility, which may offer dif-
ferent supply tariffs for the power circuits.
Observe the technical connection requirements of
the power supply utility.
■ The power-OFF assignment is made via the type of
connection.
In Germany, the power supply can be cut off for up to
3 x 2 hours per day (24 h).
■ The heat pump control unit/PCB must be supplied
with power
without being interrupted by the power
supply utility. Tariffs subject to possible shutdown
must not be used here.
Install the power supply of the heat pump control unit
and the cable for the power-OFF signal in accord-
ance with the separate "Connection and wiring dia-
gram".
■ Protect the power cable to the heat pump control unit
with an MCB/fuse of max. 25 A.
Information on the compressor power supply
(power circuit)
■
!
Please note
Incorrect phase sequence can cause damage
to the appliance.
Make the compressor power supply
only in
the phase sequence specified (see terminals)
with a
clockwise rotating field.
■ The compressor power MCB/fuses must have C
characteristics.
Control circuit power supply (230 V~) and power circuit (400 V~)
Make connection in accordance with the separate
"Connection and wiring diagram". Recommended power cables
Note
■ The specified cross-sections and max. cable lengths
apply to routing in empty pipes or ducts at an ambi-
ent temperature of up to 25 °C.
■ In the case of routing in the vicinity of heating pipes
or encapsulated routing, the cross-sections and max.
cable lengths must be recalculated (on site).
Power circuit (400 V~) on site, control circuit (230 V~) factory-fitted
Type
Cable cross-section Max. cable length
BW 301.BS090
BW 302.BS090
WW 301.BS125
WW 302.BS125
5 x 35 mm
2 40 m
BW 301.BS120
BW 302.BS120
WW 301.BS155
WW 302.BS155
5 x 50 mm
2 40 m
BW 302.BS150
WW 302.BS200
5 x 70 mm
2 40 m
BW 302.BS180
WW 302.BS250
5 x 95 mm 2
With cable lug for M8
40 m
BW 302.BS250
WW 302.BS300
5 x 120 mm 2
With cable lug for M8
40 m
Installation sequence
Power supply
(cont.)
5549 991 GB
Installation