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5.2 Power Cord Connection
NOTICE!
All indoor units must be unified of power supply so that they can be powered
ON/OFF at the same time.
Fig 5.2
●
For units with single-phase power supply.
（
1
）
Detach the electric box lid.
（
2
）
Let the power cord pass through the wiring through-holes.
（
3
）
Connect the power cord to terminal "L, N, ".
（
4
）
Fix the power cord with wiring clamp.
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit (or indoor unit)
(1) Detach the electric box lid.
(2) Let the Communication cable pass through the wiring through-holes.
(3) Connect the communication wire to terminal D1 and D2 of indoor 4-bit wiring board, as
shown in fig5.3.1.
Fig 5.3.1
Fig 5.3.2
(4) Fix the communication cable with clamp of electric box.
(5) For more reliable communication, make sure connect the terminal resistor to the most
downstream IDU of the communication bus (terminal D1 and D2), as shown in fig 5.3.2,
terminal resistor is provided with each ODU.
5.4 Connect Communication Wire of Wired Controller
(1) Open electric box cover of indoor unit.
(2) Let the communication wire go through the rubber ring.
(3) Connect the communication wire to terminal H1 and H2 of indoor 4-bit wiring board.
Lennox VRF Air Handler Indoor Unit
