G - Physics
05
D
G05D 23/19 (2006.01) F24F 11/00 (2006.01)
Patent
CA 2120043
Abstract of the Disclosure A twinning controller or control circuit (10) for use in an HVAC system is coupled between a system thermostat (3) and at least two HVAC units (4, 5) coupled to a common duct. The HVAC units (4, 5) are heating, cooling or heating and cooling appliances such as heating furnaces, air conditioners, fans, other forced air systems, or other devices for heating and/or cooling an environment. The twinning controller (10) is capable of operating in a single-stage mode (single mode) or a double-stage mode (dual mode). When operating in the double-stage mode, the twinning controller (10) alternately operates the first HVAC unit (4) and the second HVAC unit (5) in order to extend the operating life of the HVAC units (4, 5). The twinning controller (10) includes a microcomputer (84) which receives inputs from the system thermostat (3) and provides outputs (30, 31) to the first (4) and second (5) HVAC units in order to efficiently control the temperature in an environment such as a living space. The twinning control (10) includes LED indicators (42, 44, 62, 64) which provide fault codes and blower sense inputs (94, 96) for receiving signals indicative of the status of blowers (6, 7) in the HVAC units (4, 5).
Klaus J. Michael
Lucas Marvin A.
Bereskin & Parr
Johnson Service Company
LandOfFree
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