Patent ID: 7918407
Filing Date: 2011-04-05
Classification: F24F,Y02B

Abstract:
1. A retrofit control system for controlling the speed of a fan motor for a forced air conditioning system having interlaced coils operable in heating, ventilation, deadband, and part load cooling modes, respectively, to control supply for speed during operation of said air conditioning system to reduce energy consumption, and provide CO 2 air quality control, said control system comprising: (a) a suction [/] pressure sensor located on a suction refrigerant line exiting a direct expansion cooling coil; (b) a control mode input relay digital input circuit; (c) a power output circuit for controlling the speed of said motor as a function of said output signal to vary the speed of said motor in accordance with a control mode input signal; (d) a CO (e) a heating operation and cooling operation selection circuit operably connected to said power output circuit and input relay circuit and suction [/] pressure sensor for varying the air flow in each of the cooling, heating, and ventilation deadband modes, controlling refrigerant suction pressure, and modulating the ventilation rate as required to maintain a maximum of 1000 ppm of CO