[Tones]

Hello everyone,

I just had a York 80k BTU two stage 1200 CFM furnace installed in March of this year and have been very please with it since. I became accustomed to the two stage operation in the heating season, with the first stage kicking into the second stage after some time, but am curious as to how the furnace will operate now that cooling season is here.

I have a 2011 Goodman single stage 13 SEER AC. With my previous furnace, a Carrier 58SX Weathermaker from 1990, the AC would kick on in one speed only, high, and remain that way until the temperature was met. With my new furnace, i'm not sure what's happening. It seems that the blower will be on for a VERY long time before the set temp is met, much longer than it used to be with my old furnace. I can't detect any blower "stages" or even different air speeds when listening or placing my hand to the vent.

Question is, what normally happens with a two stage furnace when hooked up to a single stage AC? Is it normal for the blower to run longer and and lower velocity? Are there more than one blower stages when using a single stage AC with a variable speed blower?

Thanks,

Tones.

 

[dougfamous]

We see this a lot. It sounds like the installer didn't connect the thermostat to the furnace properly. A two stage furnace with a single stage AC should only be operating on one blower speed for AC. It should not be low speed, either.

 

[BaldLoonie]

The blower will run at a preset speed. If you have a 3 ton A/C likely the blower will be set for full 1200 CFM. Now, we often see installers who don't wire up the single stage A/C right and hook it up so the blower runs on a lower setting thinking you have a 2 stage A/C running on low. We sell Rheem and they just changed how its done so our guys have been tripped up on wiring.

 

[2old2rock]

TM9V will have 4 different blower profiles for cooling. it's called geo track.

 

[NCHeat]

TM9V will have 4 different blower profiles for cooling. it's called geo track.

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