40
(2) All communication wires of
VRF
are connected by screws.
Fig.50
(3) If a single communication wire is not long enough and needs to be connected, the
connected joint must be welded or pressure-welded. Do not simply twist the wires
together.
4.6.4 Communication address
Auto addressing technology is adopted for
VRF
IDU and ODU. No need to set address
codes manually. Only the addresses of master unit and central control are needed to be set
(address of central control is only needed when there are multiple refrigeration systems).
NOTICE!
When installing remote monitor or central controller, displacement on indoor
units’ project codes must be made. Otherwise, there will be collision malfunction of the project
codes. For detail operation methods, please refer to the
VRF
Installation and Maintenance
Manual.
4.7 Connection Method and Steps for System Communication
4.7.1 Communication connection between IDU and ODU
NOTICE!
The centralized controller can be installed when it is necessary.
Connect IDU and ODU via terminal D1/D2 of wiring board XT2. Below are the connection
graphics of single unit and modular units:
Lennox
VRF Unit
