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oba97 10-10-2012 05:12 PM

can you tell what stage your furnace is running in?
I just had a york tm9v furnace installed and am surprised about how loud it is. Is it possible that it is firing in the 2nd stage and not the first. I was under the impression that I would barely hear the thing. Also, they installed a single stage thermostat. Is that a big deal? Last question, should I be able to tell if the speed on the blower is changing (i.e. the variable speed is working)?



diyorpay 10-11-2012 11:25 AM

This page shows "taps" for heating and cooling settings for various models:

gregzoll 10-11-2012 12:16 PM

Yep every time. The lower fan speed when it comes on is 1st stage, higher fan speed is 2nd stage. As for the Single stage thermostat, the computer on the furnace circuit board is doing all of the work to determine what stage. Where as with a two stage thermostat, the thermostat would be doing the work to determine when to ramp up or down.

beenthere 10-11-2012 05:50 PM

If they didn't jumper W1 and W2 together.

gregzoll 10-11-2012 08:06 PM

There should be a jumper or switch on the circuit board to change for Single or two stage thermostat attached.

raylo32 10-12-2012 08:19 AM

I have the same furnace and it is pretty easy to notice the difference in the stages. Pretty darned quiet and not so quiet... as to the variable speed you see that every cycle startup and shutdown as the blower ramps up from zero to its run speed for the stage and back again at the end of the cycle. Also ramps up and down smoothly between stages.

If you want definite indication of stage (and more control over operations) get a real 2-stage t-stat. They indicate what stage they are in and you can make settings that control when the shifts occur. Otherwise the onboard computer should make those decisions... unless as noted by BT they set it up for pure one one stage operation... but not sure why they would do that.

If you really want to understand how this is setup look at the manual here. Then look at your furnace circuit board to see how they have it wired up and where the jumpers are.

oba97 10-12-2012 12:45 PM

Thanks Raylo, Im going to take a peak tonight. What are your opinions on the furnace? Happy with it?

raylo32 10-12-2012 01:55 PM

I got it last year and did a DIY install with a little advice from the guys here. I like it just fine so far. Haven't had a single issue, but then it is essentially new. Very quiet in low stage. I am running it with a 3M50 wifi 2 stage thermostat. To get it as quiet as possible you can (or have the HVAC tech) adjust the blower speed jumpers to slow it down (of course depending on how it's set now) keeping in mind the specified temp differences to avoid approaching the high limit.

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