The manual definetly doesn't show that at all though. Only read from DIP switches.Without a jumper on the Y1 to Y2 connection you only got the lower fan speed values for cooling mode.It's definitely some kind of mixed system (looking at Control Board inputs and communications from the T-Stat) in this configuration for cooling operations. The manual does show only the 4 wires (R,C,Com1 and Com2) to the T-stat and then the C and Y1 to the condenser for the wiring diagram on this configuration of equipment, but as the installer found out that's not the whole story.Without a jumper on the Y1 to O connection, none of the ramping or fan speed control from the T-Stat worked on cooling mode. No need for the jumpers shown in the conventional stat wiring section, as the ComfortNet stuff handles all that with the furnace. That's how they can support a non-communicating condenser unit. When the stat calls for cooling, it appears that the furnace control board just activates the condenser on the Y connection. The proper 4 pin connector should have been used.Sounds like he isn't totally 'communicating' your system.That's what I was thinking but I'm just a HO so was reluctant to comment.Looking at the installation manual, it looks like in this kind of mixed configuration, the stat talks to the furnace control via ComfortNet.
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