Midea MV8M-160WV2N1 - Page 116

V8 Mini R410A VRF 50Hz
114
Midea
V8 Mini
Series Engineering Data Book
8.3.3 Outdoor unit and indoor units’ M1, M2 communication-IDUs uniform power supplied
Communication wiring design and installation should adhere to the following requirements when all IDUs uniform power
supplied:
 0.75mm
2
two-core cable should be used for communication wiring when all the indoor units are uniform power
supplied.
 All indoor units in the system are V8 indoor units.
 After the final indoor unit, the communication wiring CAN be continued back to the outdoor unit to ensure
communication in case of disconnection point. In this situation, M1 M2 are polarized and M1 should connect to M1,
M2 should connect to M2.
 Applicable standards: EN 55014-1 and EN 55014-2. The communication line must be shielded wire.
Figure 3-8.7: M1 M2 communication wiring configuration – IDUs uniform power supplied
8.3.4 Outdoor unit and indoor units’ M1, M2 communication- IDUs with separate power supply
Communication wiring design and installation should adhere to the following requirements when IDUs separate power
supplied.
 1.5mm
2
two-core cable should be used for communication wiring when there is indoor unit separate power supplied.
 All indoor units in the system are V8 indoor units.
 If the total distance is less than or equal to 200m and the total number of IDUs is less than or equal to 10 sets, the valve
is powered and controlled by the master ODU.
 If the total distance is longer than 200m or the total number of IDUs is more than 10 sets, a repeater is required to
increase the bus voltage. The load capacity of the repeater is the same as that of the ODU, and it can load a bus length
of 200m or 10 IDUs.
 Maximum one repeater can be installed in the same refrigerant system.
 The number of IDUs requiring power supply in the same refrigerant system is less than or equal to 11 sets.
 Keep the power on/off for both the repeater and the ODUs, or the repeater use an uninterruptible power supply.
 For repeater installation, please refer to the repeater installation manual. Do not reversely connect the upstream and
downstream IDU ports of the repeater; otherwise, it will cause a communication failure
 After the final indoor unit, the communication wiring should NOT be continued back to the outdoor unit – that is, do
not attempt to form a closed loop.
 Applicable standards: EN 55014-1 and EN 55014-2. The communication line must be shielded wire.
L1+La+Ln≤2000m,Communication wiring 2*0.75mm
2
Communication wire
Power wire
M1
M2
ODU
···
L1
La
M1 M2
L
L
Ln
L
L
Distribution box
Distribution box
Circuit breaker
N L
n# IDU
M1
M2
(n-1)# IDU
M1
M2
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L
L
N
N
L
L
N
1# IDU
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