The wiring should be from the T-Link to the thermostats in a daisy chain fashion. The X1 and X2 connections from the T-Link should have a single twisted cat5 pair connecting to X1 and X2 connections on the thermostats. This should continue in a daisy chain fashion to the last thermostat. Note: 18awg will not work. The wire must be 24awg twisted pair.
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