VRF Air-Conditioner IOM
7
7.3
Connection of indoor unit power line
The power supply connection for indoor unit is detailed in electric schematic diagram on electric control box.
Wiring specification is RVV2X2.5+1.5.
7.4
Type setting
Type setting is detailed in the electric schematic diagram on the electric control box.
7.5
Communication wire connection
Note: Inlet and outlet lines (TB2 inlet and TB3 outlet) of indoor unit shall not be reversed,
otherwise
, there will be fault and
the unit can't be started.
Recommended model of communication wire is RVSP2X 0.75.
"TB2 inlet" connects the communication wire from outdoor unit communication terminals (A and B) or from the
former indoor unit (TB3).
Communication wire of "TB3 outlet" connects to the communication port of the next indoor unit (TB2 inlet).
Inlet and outlet lines (TB2 inlet and TB3 outlet) of indoor unit shall not be reversed, otherwise, there will be fault
and the unit can't be started.
Connect according to the diagram, do not allow A and B polarity connection error, otherwise, communication
failure or controller damage may be caused.
In order to avoid signal interference, the communication wire must use shielding wire, and the shielding layer
shall be earthed.
The communication wire exceeding the specific length may cause air conditioner out of service due to
communication problem: communication wire length ≤500m and total length ≤1000m.
7.6
Install the controller
Install the wire controller on the pre-reserved site on the wall.
Carcassing for communication wiring should be ready before installation the controller. The recommended
Outdoor unit
