	US 7,537,172 B2
	HVAC communication system
John F. Rossi, Mendham, N.J. (US); Paul Michael Huddleston, Sandy Springs, Ga. (US); Mark Lee Barton, Lilburn, Ga. (US); Bradley A. Smith, Buford, Ga. (US); Howard Ng, Towaco, N.J. (US); Carl J. Mueller, St. Louis, Mo. (US); James P. Garozzo, St. Louis, Mo. (US); Cecil H. Barrett, Lawrenceville, Ga. (US); and Russell Thomas House, Ball Ground, Ga. (US)
Assigned to Comverge, Inc., Duluth, Ga. (US)
Filed on Dec. 06, 2006, as Appl. No. 11/567,641.
Application 11/567641 is a division of application No. 11/301447, filed on Dec. 13, 2005, granted, now 7,163,158.
Prior Publication US 2007/0131787 A1, Jun. 14, 2007
Int. Cl. G05D 23/00 (2006.01); G05B 11/01 (2006.01); G08B 1/08 (2006.01); H04M 11/04 (2006.01)

U.S. Cl. 236—51 [340/310.17; 340/538; 340/538.16]

10 Claims

1. A HVAC system comprising:

a. at least one HVAC load;

b. an air handler coupled to the at least one HVAC load; and

c. a communication device coupled between the at least one HVAC load and the air handler, the communication device comprising:

i. an input terminal electrically coupled to the air handler;

ii. a Y-terminal electrically coupled to the HVAC load;

iii. a power supply module coupled to the input terminal;

iv. a communication module coupled to the power supply module;

v. a first signal transformer coupled to the communication module, wherein one winding of the first signal transformer is coupled serially with the Y-terminal; and

vi.a switch, wherein when the switch is closed, the HVAC load actuates.