Hitachi RAS-5HVRNM1E Service Manual page 112

4 Electrical Wiring
System example of H-LINK II
There are two typical cases of using H-LINK system:
1 Using H-LINK system with air conditioners only
2 Using H-LINK system with air conditioners with a central control device. The system examples are shown below.
a Using H-LINK system for air conditioning systems without a central control device (CSNET WEB or PSC-5S).
Line connection for all units (including Utopia and DC inverter).
Line connection for each floor
Connection with one main line and with the branch lines for the units
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SMGB0060 rev. 1- 12/2010