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When you use a remote controller less unit to connect indoor units that are compatible with TU2C-LINK, you need to use one
of the following methods to do remote controller less settings for the indoor unit. If these settings are not done, a Check Code
E03 (Indoor - Remote controller communication error) is detected.
• On the wired remote controller or energy-saving neo remote controller, change DN [103] from 0 (with remote controller) →
1 (remote controller less)
• On the System Controller being used, change DN [103] from 0 (with remote controller) → 1 (remote controller less) for the
relevant indoor units*
*Limited to compatible Central Control Devices.
3-11.Comm software update
This screen is not used. Do not operate it.
When you connect the System Controller, set a central management address (DN03) for each indoor unit. Central management
addresses require that you register separate numbers for each indoor unit, but if you mistakenly register the same central
management address for different indoor units, an L20 (duplicated central control addresses) warning will be detected by
System Controller or the local remote control.
With TU2C-LINK, the System Controller detects an L20. With TU2C-LINK, the remote controls belonging to the individual indoor
units detect an L20. The System Controller, which is incompatible with TU2C-LINK, may not be able to detect an L20, depending
on conditions*, if the indoor unit is compatible with TU2C-LINK. Be sure to do a one-to-one test for the System Controller and
indoor units.
There are some models on which you can check for duplications on the central management address list screen, depending on
the model of the System Controller.
* Central Control Devices whose model name does not contain "U"
[Conditions]
When the same central management address is set for indoor units using different coolant systems in a system of outdoor units
and indoor units that are compatible with TU2C-LINK and a Central Control Device that is incompatible with TU2C-LINK.
Settings to Connect a Machine That Has No Remote Control
About L20 (Duplicated central control addresses) Warnings
Remote controller
less devices
System Controller
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