Have them enable Comfort-R for humidity control. The tech can set the airflow at what he wants, but with Comfort-R, the system will ramp up (in terms of airflow).

You should have 4 selectable air speeds: Low, Med-Low, Med-High, and High. If I understand Comfort-R correctly, the blower will start out at 50%, then go to 80%, then to 100% (if needed). This really helps remove humidity, and it's a hallmark feature of Trane's variable-speed air handlers. I'm not so sure they have Comfort-R enabled. If you REALLY want good humidity control, leave Comfort-R off and have them install a VisionPRO IAQ thermostat. With this, you set the humidity level you want, and unlike the TCONT803, it actually slows the blower down to dehumidify on demand. I believe this thermostat was recommended to you previously. How many square feet does your home have? 4 minute run times? That thing's gotta be oversized...

My Goodman furnace came with paperwork that included how to change the speed settings on the blower. Plus it had a jumper wire with it if needed.

"My Goodman furnace came with paperwork that included how to change the speed settings on the blower. Plus it had a jumper wire with it if needed."
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However, it is important to keep in mind that you cannot voluntarily change the blower speed always; there are other factors to consider while doing this (i.e. ductwork, cfm/ton, etc.)

If you have a variable-speed air handler, there are dipswitch settings that need to be set based on system size. The combination of settings determines fan speed for cooling, heating, and fan-only.

Only if you have a non v-s air handler do you actually swap wires.

Hello Ray and all.
I have tried to get them to install the Honeywell but to no luck yet. This is the oldest Trane dealer in area around 25 years in county. I asked the difference of the tec when he was out of the 803 ans 804 Stat. He had no idea. Lady in the office sort of snooty also. On the 803 say I have Humidity set at 50%. How high should it go before it turns on system to try and deal with it? We had tem at 77 humidity at 50% . Came home it was 77 but humidity at 53% and not running. Shouldn't it attempt to control humidity no mater where it is set?, Oh Ray to answer your question house is 1640 SF including the 240 sf insulated glass room we added on. They installed a 3 ton HP. Up from 2.5 ton we had before adding room. Could it also be because the tem outside is not high yet but humidity is. Thought system not needing to cool long enough to bring down humidity. Couls it be son takes long hot showers and doesn't always turn bathroom fan on? Sorry all the questions, just after $6000 want the thing to work the way it should.

It's absolutely understandable that you want the system to work the way it should. From what you describe, it doesn't sound oversized, but rather misconfigured. The "IAQ" thermostat would be the Trane 900 stat, not 804 (no such stat exists as far as I know). As far as the humidity control and when it turns the system on, I don't know. To me, it should maintain what you set. Hopefully someone with experience with these thermostats can jump in (I don't have the humidity control). I would: 1. make sure Comfort-R is enabled if you want to keep the current thermostat and 2. have a competent tech come out to set the blower speed to an acceptable setting. It may be time to call another company. Pepster, try posting your problem on HVAC-Talk.com (register and go to Residential HVAC). They have pro members who deal with this type of equipment day in and day out. Good luck.

Yes... you REALLY need to tune in your son, too!
Tell him no fan = no dinner.