3
Compatibility and common wire
(c-wire) requirement
No common wire
required
•
Conventional heating
and cooling systems
Common wire required
•
Apple HomeKit
•
Heat only or Cool
only (2 wire)
•
Heat pumps
Not compatible
•
Millivolt systems
*External 24 VAC Transformer
is an option
•
Communicating
systems
•
Line voltage systems
•
Accessory control
