Patent ID: 7648077

Claim:
A method of communicating across an HVAC system, the method comprising the steps of: a. providing a first communication device coupled serially with at least one wire of the HVAC system; and b. providing at least a second communication device coupled serially with the at least one wire of the HVAC system; and c. providing an HVAC load device having a coil winding coupled to the at least one wire, and disposed serially between the first communication device and the second communication device; and d. inducing a current in the at least one wire for communicating a signal thereon; wherein the current comprises an AC current having a frequency of between 5 and 50 MHz that is selected such that the signals are able to pass, unfiltered and unaltered, through the winding capacitance associated with the coil winding of the HVAC load device.