We have a 3.5 ton Trane heat pump with a 4 ton Tempstar variable speed air handler (both units new in 2004). In January we were told that "all the dip switches were OFF"; so they had to have been that way since the unit was installed. The air flow has always been too strong so, at our request, last week an HVAC repairman came to lower the air flow. He said he "changed the dip switches to lower the air flow 300 cfm"; I could tell no difference in the air flow so he went back and "lowered the dip switches 300 cfm again". He told me the air flow "had been lowered to 1400" and then he left. There is still no difference in the air flow, it is still full strength. I checked the dip switch settings yesterday. They are as follows:
1 (Time Delay Select) ON
2 (Time Delay Select) OFF

3 (Heat CFM Select) ON
4 (Heat CFM Select) OFF
5 (Heat CFM Select) OFF

6 (Cool CFM Select) OFF
7 (Cool CFM Select) OFF
8 (Cool CFM Select) OFF

I would like to know if these settings indicate that the air flow has been lowered from 2000 to 1400 as I was told. If they do indicate the air flow has been lowered, then why is the air still at high speed? Thank you for your help

In response to your question,you can change the dip switches in the control center but that will not help the fan speed because the control center program will need to be adjusted for the cfm's to be increased or decreased.

Now for the real question. How do you know there is no difference in the air flow. Did you test it with a velocity meter? OR are you just listening with your ears. If you are using your ears to tell the difference that could be the problem. Get your unit tested with a air velocity meter or better yet call the company back and ask them to bring the meter with them so they can show you the difference.

It is best if YOU do not start to play with your dip switches
Sometimes the air flow/noise is strong because it is needed to get the job done. The duct could be to small causing a high velocity noise and other variables.

No, no, no, I would never attempt to play with the dip switches; I'm wanting to know if the HVAC man actually did change the velocity. How do I know there is no difference?. I know because for over three years the vent has been blowing on me while I'm in bed; AND I can tell by the way that same register also blows the drapes at the window... I've watched these drapes being blown for over three years! SO, it seems to me if he lowered the speed from 2000 to 1400, I would know it. BUT, I will heed your suggestion and ask tha the velocity be tested with a meter. So you're telling me that the position of the dip switches could mean that the fan velocity has been lowered??
Thanks for responding!

((So you're telling me that the position of the dip switches could mean that the fan velocity has been lowered?? ))

Here is what I told you

In response to your question,you can change the dip switches in the control center but that will not help the fan speed because the control center program will need to be adjusted for the cfm's to be increased or decreased.

I would not want air to be blowing on me while in bed either.They may be able to lower the fan speed and keep the unit working within the specifications or not. That will be the job for the service techs when they come to your house to tell you. I am not there. I cannot really tell what your system is doing or how it is performing. It takes temp readings/humidity levels/blower fan speeds all to work together for the system to operate as designed. All you can do is see what they say when they come out. If you are unhappy with there service call someone else.

Two things, kindly post the model number of the fan unit, and if the tech did NOT power off the unit when he made the dip switch changes... it did not register on the fan /control boards logic chip. And the unit will operate as before. ( like there was no dip switch change, you will still have same blower speed and air flow)

tsa7man: The model number of the fan unit is: EBV4800A (Tempstar). Yes, I read in the literature that the power had to be off for the changes to take effect and that was not done. However, when we turned off the power to look at the switches, about 2 weeks later, then the change DID take effect. NOW the fan is actually going into a slower speed when the auxiliary heat is on, but still blowing full force otherwise. We have asked them to come back and adjust the air flow. When they call to tell us they are coming, we will ask them to bring a velocity meter. Thank you for your response.