Part 1. Overview
DCM014A51 Design Guide 9
2.2 DIII-Net System and Group Addresses
1. The DIII-Net system consists of the following:
a. Up to 10 VRV outdoor units (daisy chained).
b. Up to 128 indoor units.
2. The iTM (central controller) and DIII-Net system consists of the following:
a. Up to 10 VRV outdoor units (daisy chained).
b. Up to 64 indoor unit groups (128 indoor units).
c. Up to 7 iTM Plus Adaptors can be connected to a single iTM. Each adaptor can contain up to
64 group addresses and 10 outdoor units.
3. When a centralized controller is connected to the DIII-Net system, a unique group address
must be created for each indoor unit to be monitored and controlled by the central controller.
4. Group Address:
a. Indoor units are assigned unique group addresses (up to 64 per DIII-Net system) manually
during the VRV commissioning.
b. Addresses are as follows: 1-00 to 1-15, 2-00 to 2-15, 3-00 to 3-15, 4-00 to 4-15.
c. With the use of the iTM Plus Adaptor, up to 8 DIII-Net systems can be connected to a single
iTM. Each DIII-Net system will be assigned a port number with the iTM being port 1. For
example, an indoor unit connected to the iTM will have the complete group address of 1:1-
00. Similarly, each additional system will be assigned a port number 2 to 8 (2:1-00, 3:1-00,
etc.).
2.3 Remote Controller Group and Group Address
1. A remote control group consists of 1 -16 indoor units connected (via P1P2 daisy chain) to the
same remote controller. The indoor unit group allows for a maximum of 2 remote controllers
to be connected to the same remote controller group. It is not required to have a remote
controller connected to an indoor unit. If no remote controllers are used there should be a
centralized method for monitoring and controlling the indoor units.
2. Assigning a group address to a single indoor unit (typical configuration):
* F1F2 = DIII-Net ** P1P2 = Remote Controller line
Figure 5. Assigning Group Address to a Single Indoor Unit
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