||01-23-2010 02:27 PM
Wiring a Ruud RGTK-06E series furnace for 2-ton cooling
I’m trying to determine if the air handler can be wired for use in an existing 2-ton cooling system. Since I would need approximately 800 CFM for cooling, is there a way to use the same motor winding (M-LO) for both high fire and cooling? I’m using a 2-stage thermostat, and anticipating this change because the HI motor winding, which is factory connected to COOL, supports a 3-ton system (1300 CFM). Of course, the final settings for all the motor speeds would be determined by measuring the amount of superheat during cooling and the heat rise during heating.
Without seeing a schematic for the IFC board, I don’t know if it’s okay to simply jumper the COOL terminal to the HEAT terminal. The HI and M-HI motor windings would not be used, and the LO and M-LO windings would be connected to the LOW and HEAT terminals on the IFC board, respectively.