Midea ATOM MDV-V28WDHN1 Manual page 100

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Notes for installers
The power supply should be connected to the outdoor unit power supply terminals as shown in Figure 3-8.2.
8.3 Communication Wiring
Communication wiring design and installation should adhere to the following requirements:
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 0.75mm three-core shielded cable should be used for communication wiring. Using other types of cable can lead to
interference and malfunction.
 Indoor communication wiring:
 The P Q E communication wires should be connected one unit after another in a daisy chain from the outdoor
unit to the final indoor unit. At the final indoor unit, a 120Ω resistor should be connected between the P and Q
terminals. 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.
 The P and Q communication wires should NOT be grounded.
 The shielding nets of the communication wires should be connected together and grounded. Grounding can be
achieved by connecting to the metal casing adjacent to the P Q E terminals of the outdoor unit electrical control
box.
Figure 3-8.1: Indoor unit power supply wiring
Single-phase 220~ 50/60Hz
Leakage protector
Manual switch

Figure 3-8.2: Outdoor unit 1-phase power supply terminals
Atom B Series VRF 50/60Hz
Branch box
Indoor unit
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