
The number of adapters required to convert existing RJ-11 wiring (used with multi-zone CCC and CCC2 systems) will vary depending on the specific installation. Key factors include: The total number of rooftop units being replaced and the position of each unit within the daisy-chain wiring sequence. In general, an adapter is required when connecting an RJ-11 cable to a Connect Essential control board or CMC wall thermostat or Replacing a CCC2 10-button wall thermostat with a Connect Essential CMC thermostat
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