Viessmann AWT 221.A04, Installation And Service Instructions For Contractors

Page: 41 / 140

41
Connecting indoor and outdoor units
Type AWT/AWT-AC
221.A04
221.A05/A07 221.A10/A13 221.B10/B13/B16
230 V~ 230 V~ 230 V~ 400 V~
A
B
12V COM COM 43V
C N L
?
C
Fig. 34
12VCOM COM43V
COM
Ni
?
Li N
0
L
0
A
C
B
?
Fig. 35
?
N L
?
N L
C2 C1
12VCOM COM43V
A
B
C
Fig. 36
?
N L
?
N L3
C2 C1
L2L1
12V COM COM 43 V
A
B
C
Fig. 37
A
Outdoor unit wiring chamber: see page 40.
B
Bus cable between the outdoor and indoor unit
Recommended cable: 3 x 1.5 mm
2
The cores are not interchangeable.
C
AVI PCB in the indoor unit: see page 34.
Note
Route the bus cable for the indoor/outdoor unit in the
230 V~ voltage area.
Power supply
Isolators for non-earthed conductors
■ Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage category
III (3 mm) for full isolation. This isolator must be fitted
in the permanent electrical installation in line with
installation requirements, e.g. mains isolator or
upstream circuit breaker.
■ We additionally recommend installing an AC/DC-
sensitive RCD (RCD class B
) for DC (fault)
currents that can occur with energy efficient equip-
ment.
■ Residual current devices to DIN VDE 0100-530
selecting and sizing.
Danger
Incorrect electrical installations can lead to seri-
ous injury from electrical current and result in
appliance damage.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■ IEC 60364-4-41
■ VDE regulations
■ Technical connection requirements specified
by the local power supply utility
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
The appliance and pipework must be connected
to the equipotential bonding of the building.
Danger
Incorrect core assignment can lead to serious
injury from electrical current and result in appli-
ance damage.
Never interchange cores "L" and "N".
■ In negotiations with your power supply utility, differ-
ent supply tariffs for the main power circuits may be
offered.
Observe the technical connection conditions of the
power supply utility.
■ If the compressor and/or instantaneous heating
water heater are operated at an economy tariff
(power-OFF), either provide an additional cable (e.g.
3 x 1.5 mm
2 ) for the power-OFF signal from the dis-
tribution board (meter box) to the heat pump control
unit.
or
Combine the cables for the power-OFF signal and
for the heat pump control unit power supply
(3 x 1.5 mm
2 ) in a 5-core cable.
Installation sequence
Electrical connection
(cont.)
5776 028 GB
Installation