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Tn2 vs Tn4
JL_2
Member Posts: 17
Does anyone know the difference between Tn2 402 and Tn4 422? Or just the Tn2 and Tn4 in general?
0
Comments
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TN's
TN4 is an older bus, but supports both controller to controller interconnection as well as controller to thermostat. It requires 4 wires.
TN2 is new, and (so far) is only used for controller to thermostat connections. It requires only 2 wires. This can sometimes save a lot of work on retrofits.0
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