Multi Variable Air Conditioners Duct Type Indoor Unit
15
5.2 Power Cord Connection
Notes:
All indoor units must be unified of power supply so that they can be powered ON/OFF at the
same time.
power supply
Outdoor unit
Indoor
unit 1
Indoor
unit 2
Indoor
unit n
connection
wire (match
with resistance)
Wired Controller
Wired Controller
Wired Controller
Note: indoor unit quantity n is according to the outdoor unit capacity.
Wiring board of power XT1
Wiring board of
communication XT2
Wiring board of power XT1
Wiring board of
communication XT2
Wiring board of power XT1
Wiring board of
communication XT2
QF
QF
PE
QF
PE
QF
PE
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 card 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.
wiring screw
terminal board
1
D1
D1
D2
H1
H2
D2
H1
H2
IDU PCB
indoor unit
previous IDU
match resistance
for communication
communication
interface CN12
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.
(4) Fix the communication wire with wire clip on the electric box.
