Waldrop

What is your location?

Post mdl number of outside condenser. You can find it on the data plate.

Purchase a cheap digital thermometer/humidity gauge at a big box store.

Take several supply readings at different locations upstairs as well as return readings both morning and late afternoon. Take second floor humidity readings as well.

I am not certain what tech is measuring. On a new system like yours, you would want a temperature differential between 15-20 degrees.

I assume ductwork for upstairs system has been checked for leaks.

The two major possibilities that come to mind are bad refrigerant charge and the possibilitybthat you might be undersized.

The idea that your system runs continuous from the morning to the evening is not normal unless you are in area having extreme daytime temps.

Post back.

IMO

My Trane does this: it starts slow. It runs at a slow speed for a few minutes. Then the speed increases to a higher (high) speed. Then it turns off whereby it runs at a very slow speed for about 30 seconds. Then it quits.

We are in Alabama. It is very hot. It was just my thought that a brand new, 6 month old unit should not be running 15-16 hour days especially with closed cell foam and open cell between the 9th ceiling and attic storage. Our humidity reads 56% on the wall thermometer now and 76 degrees. I will post numbers in a few.

Tech said he adjusted the freon. I did know they still made units with freon. He said that the freon should be at a ten for the distance from furnace/blower/inside unit and he put it at a 11. I feel like I'm undersized considering our downstairs can hold at 69 and cycle on and off.

Mwaldop

Weed made a good explanation of variable speed and what Trane calls Comfort-R which is the proper setting for ramp up/ramp down of the var speed blower.

What thermostats for new systems were installed?

Certainly install tech should return to see if Comfort R was set correctly as well as amount of airflow/CFM setting. A lower airflow setting can improve humidity level as well as Comfort R. Make certain your fan for AC mode is set at "auto" not "fan on". Fan on setting can reintroduce humidity off the coil back into the home.

Can't think of any other suggestions.

wdc

I will look up that post.

Trane thermostats were used. It is the TCONT803

The fan is set to auto.

Here are the numbers for both units.
4TTR3030D1000AA model number
103747SM3F serial number

4TTR3042D1000AA model number
10374RBP5F serial number

courtesy of weed

Posted by weedmeister (My Page) on Wed, Aug 3, 11 at 15:54

My Trane does this: it starts slow. It runs at a slow speed for a few minutes. Then the speed increases to a higher (high) speed. Then it turns off whereby it runs at a very slow speed for about 30 seconds. Then it quits.

those are 2 1/2 and 3 1/2 ton XR13 Trane AC condensers.

good thermostat.

IMO

Thank you for the information.

I'm now thinking that since we have a 2.5 ton and were to have a 3 ton that maybe we have the XR95 (multi speed) rather than the XV95 (variable speed). I would assume that is why my "system" doesn't ramp up from a slow speed fan to a high speed, it just stays at the same speed all the time.

Now what do we do if we have been sold something that is less than what we paid for and were expecting? why can't people just be honest and be forth coming with correct information? How would I ever trust this company again? Ugh!!!

Lots and lots of companies that install new systems in homes just install the equipment, turn it on, take a few temperature readings and wish the customer luck on their new system. They rely on knowing that furnaces and air handlers are rated at 400 cfm of airflow per ton of cooling. So they install a 4 ton system and automatically think the air handler or furnace is putting out 1600 cfm of air, when it might be alot less. Depending on fan speed settings, type of evaporator coil, return air size, filter size and construction and duct system size all contributes to the overall cfm of the unit. With out liquid column gauge or a manometer to actually verify the cfm output of the unit, then the installer is really just guessing. Something to think about.

Is the 2.5 ton unit connected to the upper floor? It may be undersized for your climate. What hot has it been?

I seems unusual to have a 56% humidity if your units are running for many hours. Is your fan set to auto or do you set to the on position (fan runs continuously).

We are in Alabama and the temps have been 95-105. It is a 2.5 ton, but our invoices says we paid for a 3 ton. As for the fan being variable have no idea, I just know that the installer said he could not make it go at different speeds, but variable is what is on our invoice and what we though we where getting when we did the upgrade. The 3.5 downstairs for the entire 2200 square feet with a 20x20 den with a 18 foot vault is cool as a cucumber and keep the temp at 68, 70, 72 74 and not run for more than about 40-50 mins at a given time if it was on 72 and we move it to 68. Vents are in the floor of the main level. Upstairs the vents are in the ceiling and I have to go to a vent, and see if I can feel the air moving. There are are 3 bedrooms, large playroom and heated and cooled storage. Each bedroom has an intake and and one flow vent in the bedroom and one flow vent in the bathroom. Playroom has 2 flow vents and 2 intakes and storage has two flow vents (storage seems to be the least cooled area, that is ok).

My husband just went under the house to look at the furnace numbers but said the tag is messed up, but the numbers he got are. I looked them up but they make no sense to me and I cannot find anything on any of these numbers

xv95

model # 4TXC8048BC3hCAA the first 8 could be a b

serial # 10294X0B5G

date of manufacturer 7/2010

Does your invoice give the model numbers of what was installed?

The 2.5 ton unit is 4TTR3030D. A 3-ton would have been 4TTR3036D.

I think the 4TXCB048B is a coil number, not the furnace/blower number. The coil is a 4-ton coil. I suppose it is being used with your 3.5ton condenser. Others can speak to whether this is a good combination or not.

No, the invoice just states that we purchased a 3 ton AC with a 60,000BTU variable speed furnace and a 3.5 ton AC with a 1000,000BTU variable speed furnace.

I called the company today and asked them to send an email containing all the model numbers and serial numbers for the outside units, cols, and furnaces. My husband is not sure exactly what is going on or why they have installed a 2.5 ton and not a 3 ton. I assume that this is why the AC isn't cooling upstairs because it is undersized, but chances are there is more to this story, unfortunately! The biggest thing that bothers us the most is that we upgraded both upstairs and downstairs unit to variable speed, because we "got sold" on the humidity control and the cost savings of the ramping up speeds and that isn't something we are getting. The blowers blow at a very low speed all the time. Very quiet and you actually have to feel for air to know that it is on both up and down. The company is or we thought had a good reputation and actually does a lot of commercial installation.

Hopefully it will all get figured out. Once I get all the numbers I'll post them, I'm suppose to get them tomorrow. Thank you for all the feed back. If anyone has any other information or suggestions with the situation we will gladly take them!