Trane XV95 question


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Old 12-10-08, 06:15 PM
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Trane XV95 question

I had a XV95 furnace installed and was told by installer to have the Fan setting changed to ON instead of AUTO. What is the proper setting? Benefits of using the Fan ON 100%? Also, at the time of installation to save some money I opted to use my existing t-stat instead of 2-stage t-stat. Now I would like to utilize all the benefits of this furnace and have 2-stage t-stat installed. What would you recommend for this purpose? My current thermostat has 4 conductors used for t-stat and 2 more are not used. My set up consist of XV95 furnace, humidifier (manual), and a/c. Any recommendations? Thanks
 
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Old 12-10-08, 07:07 PM
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Smile

I think the fan setting is a personal preferance. Keeping it set to "on" only keeps air movement through your house at all times.I think the downfall is that you will feel room temperature air coming out of your diffusers which is around 70 degrees when the burners are not on compared to around 130 degree air when the furnace is running. As far as thermostats, I really like Honeywell 7000 series. If you feel like splurging, the 8000 series is a touch screen series.you should only have to hook one of the two unused wires to the w2 terminal on both the thermostat and the furnace. Hope this helped.
 
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Old 12-10-08, 08:34 PM
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Thanks for quick reply info. As far as for Honeywell 7000 series t-stat, would you happen to have model number, there are so many different thermostats on their web site? Kind of hard to decide. I just need it to be programmable, utilize two stages of XV95. Thanks
 
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Old 12-10-08, 08:58 PM
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RTH 7500D or RTH 7400D. Both are very good.
 
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Old 12-14-08, 03:05 PM
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Originally Posted by ek79989
I had a XV95 furnace installed and was told by installer to have the Fan setting changed to ON instead of AUTO. What is the proper setting? Benefits of using the Fan ON 100%?
It's up to you.

I run my fan ON in the winter, and in the summer leave it on AUTO. Reason I don't run it in the summer is when the A/C shuts off, the coil is "wet", and as that warms up the humidity is put back into the home.

In the winter, with the fan ON, it helps move the air around and provides better comfort in the home, and if you have a Media air filter, the is is being filtered all times. Also the fan use very little power to run vs a standard blower like your furnace had.



Now I would like to utilize all the benefits of this furnace and have 2-stage t-stat installed. What would you recommend for this purpose? My set up consist of XV95 furnace, humidifier (manual), and a/c.
if the budget allows you, I would suggest the Honeywell IAQ (TH9421).

The stat can do many things.
-control the humidifer
-can use outdoor sensor to conro humidity level in the winter.
-two stage heating
-can slow down the blower in the summer to help remove the humidity on a hot humid day.
-can be wired to an air exchanger (HRV)

You can control when you want the blower in the ON, AUTO, or CIRC mode.

If the budget don't allow you to do the IAQ, then you can get a nice one from retail like Home Depot.

They are the RTH7600 or RTH7500 models.
 
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Old 01-03-09, 06:48 PM
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Jay, thanks for your information. I still did not replace the thermostat and before I do this I was wondering if you could suggest regarding something I noticed happening with my furnace. I'm in Michigan and its not that cold right now but for some reason my furnace would start running full blast all of a sudden then stop and go with less speed, just for like 30 sec. Or starts off normal, with slower speeed and then kicks in high speed. What could be cousing this behaviour? Thanks
 
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Old 01-03-09, 09:02 PM
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[QUOTE=ek79989;1494664for some reason my furnace would start running full blast all of a sudden then stop and go with less speed, just for like 30 sec.[/quote]
I've never heard of this before....


Or starts off normal, with slower speeed and then kicks in high speed. What could be cousing this behaviour?
When does this happen? After say 10 min of run time?

If you are on a single stage stat, after X amount of time the furnace is going to run in 2nd stage no matter what...
 
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Old 01-03-09, 09:46 PM
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I'm on the single stage t-stat and I understand how that works. Thats why I was puzzled, the blower actually starts full speed right away and then quits in less than 30 sec.
 
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Old 01-04-09, 05:15 AM
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On the furnace, what wires are hooked up on the t-stat hook up?

Red to R, Green to G.. ect. Any jumpers?
 
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Old 01-04-09, 09:02 AM
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On the furnace there is a jumper between W2&W1 and these terminals are connected: W1, R, G, B/C, Y. On t-stat I have a jumper between Rc&R, and these trminals are connected: R, W, Y, G. Also, the dip switches on the furnace control board configured as follows: 1,2,3,4 - off ; 5,6 - on; 7 - off; 8 - on. And the staging delay is set for 10 min, heat off delay is at 100 sec.
 
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Old 02-02-09, 08:44 AM
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Looks like it was a thermostat that was causing this behaviour. I replacd my stat with TCONT802 and everything is good now. On the side note of this I have a question - is 20 min of furnace runtime ok? Thanks
 
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Old 02-02-09, 09:07 AM
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20 min sounds right.

is there still a jumper between W1 and W2 at the furnace?

Isn't W2 wired up at the t-stat? If not, do you have an extra unused wire in the wall?
 
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Old 02-02-09, 02:12 PM
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No, there is no jumper between W1&W2 at the furnace. W2 from the t-stat goes to W2 on the furnace. Everything working the way its supposed to, at least it appears like it is. Sems like you are th man to ask questions. So here it is - is there anything I ned to do to enable Comfort R feature, besides enabling two dip switches, 5&6? There is confusing info if I need to put a jumper for Y&O.
 
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Old 02-02-09, 03:02 PM
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yeah, a jumper wire is needed between Y and O to get the full Comfort-R profile.

Make sure the dip switch are set to 400 cfm /ton. and how many ton the A/C is.
 
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Old 02-02-09, 07:00 PM
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Ok, sounds simple enough. SoI just jumper Y to O, right? As for the dip switchs I think its ok, I have them set to Normal airflow @ 400 cfm/ton for 3 ton unit. That is all I have to do? If I don't put a jumper, how will it function?
 
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Old 02-02-09, 08:27 PM
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Yep, add a jumper, and you're good!

I am not sure what happens when the jumper is not there.... Guess I've been around it when it was wired up right.. I'll have to see what mine does in the morning.

I am guessing the blower starts off at 50% speed, then goes right to 100% rather than 50%, 80%, then 100%.

Do you have extra wires tucked into the wall? There is a couple of things we can do to take advantage of.

Is your A/C new as well?
 
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Old 02-03-09, 07:51 AM
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My A/C is not new and I do have one extra wire. Why are you asking about these extra wires, what I can do with this extra wire? If all is need is the jumper at the furnace I can do it right away. This jumper (Y-O) does something for heating too, right?
 
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Old 02-03-09, 06:02 PM
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Do you know if your A-coil inside the duct work have a TXV valve?

If you do, I am going to help you wire the t-stat to the furnace to run the blower at a slower speed in cool mode, and if the house gets warm, then the blower speeds up to help cool the home.
 
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Old 02-03-09, 06:47 PM
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I have no clue. Is an easy way to find this out?
 
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Old 02-03-09, 07:14 PM
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TXV is something like this.


It may not be seen outside of the duct work.. It is inside near the coil most of the time.
 
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Old 02-03-09, 07:16 PM
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I guess I can call the installer who put my furnace in and ask him.
 
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Old 02-03-09, 07:19 PM
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How old is the A/C? if it's older or a basic model, then chances are it don't have it.

My next game plan, do you some time wish you could tell if the furnace is in 2nd stage?
 
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Old 02-03-09, 07:29 PM
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A/C is older than 10 years. I did not quite understand what you were asking re my furnace 2nd stage? It does goes in 2nd in the morning when I wake up but most of the time it runs on low, 1st stage
 
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Old 02-04-09, 02:09 PM
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Ok, we are going to leave the A/C alone since it's an older model.

What I was plan on doing if you did have a TXV on the coil, we would wire it up to run the blower at 80% speed for normal cooling/dehumidifying, then if the house get warm, we can speed up the blower to help cool it down.

As for 2nd stage heating, some people can't tell, and wish to know when it's in 2nd stage.. be able to wire the t-stat to light up the red LED light on the corner, so they know it's running 2nd stage. We can leave it be if you don't wish that.
 
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Old 02-04-09, 04:25 PM
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Sounds like a cool idea, how do you wire this t-stat to show its in the 2nd stage?
 
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Old 02-04-09, 07:39 PM
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Make sure you have a wire on "B" (common).

If you have that, then add a small jumper wire from F to W2
 
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Old 02-04-09, 08:00 PM
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I'm assuming this is on the t-stat, right? I don't have a wire on "B". Does it mean it can not be done? Or since I have one xtra wire in th wall I can connect it to "B" on t-stat and somewhere on the furnace?
 
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Old 02-04-09, 08:13 PM
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You will need "B"(com) wired up for the LED to light up. so, yes match that same colored wired on the furnace B/Com.

And you could have the back light stay on all times with the common hooked up.
 
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Old 02-04-09, 08:16 PM
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Stupid question but B/C on the furnac is th common, correct?
 
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Old 02-04-09, 08:18 PM
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Correct. B/C on furnace is Common, and B on t-stat is Common.
 
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Old 02-04-09, 08:34 PM
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If I do this, will it damage anything? May be I'm too cautious? Just wanted to make sure its safe and won't cause any damage.
 
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Old 02-05-09, 06:34 AM
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Oh no, Nothing to worry about.. Just turn off the power for the furnace when you do this.
 
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Old 02-05-09, 08:59 PM
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Did everything as you suggested. Works great! I was able see red light while the system was in recovery mode. Thank you very much, this is great information.
 
 

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