Heat Pumps and Electric Heating - Tempstar Variable Speed AH Dip Switches

Tempstar variable speed, 4 ton, air handler installed in '04. Fan blows only on high. Dip switches were never adjusted. Last spring we called the installer back to adjust the dip switches; he set 1 and 3 ON and left all the others OFF; that did not change the speed of the fan. From what I'm reading, a lower fan speed would create more warmth; is that correct?

What is the model # of your air handler? Then we can try to look it up to see what it should be at.

What do you have for t-stat? (make and model as well)

Yes, slowing down the air flow will hep with warmth, but don't want to slow it down too much.

Jay, it is Tempstar Model EBV4800A variable speed air handler. We have a Honeywell Programmable Thermostat RTH 7500.

Is your outdoor unit a single stage or two stage? If not sure, model on that as well.

Ok, I looked at the manual,

Dipswitch 1-2 is Ok, leave that be.

3-4 is heating speed. 5-8 is cooling speed. The manual says refer to the blower chart for speed.

Can you post back what it says on your chart, or take a photo to share with us.

Jay, Cannot send the picture of the Motor Speed charts. It does say that:
1 & 2 are "Time Delay Select";
3, 4, & 5 are "Heat CFM Select" and
6, 7 & 8 are "Cool CFM Select".

Below that it says:
Time Delays:
00 0sec. on/60 sec. off (default)
01 0 sec. on/90 sec. off
10 0 sec. on/30 sec. off
11 0 sec. on/0 sec. off

Is this what you need? I did scan the pictures, but don't know how to get them into this space.

Jay, Cannot send the picture of the Motor Speed charts. It does say that:
1 & 2 are "Time Delay Select";
3, 4, & 5 are "Heat CFM Select" and
6, 7 & 8 are "Cool CFM Select".

That I saw in the install manual, but says see blower chart for heating and cool CFM.


Is this what you need? I did scan the pictures, but don't know how to get them into this space.
shoot me an e-mail

jaymarking at gmail dot com

Jay, Motor speeds sent to you by email, were they legible?

Sorry for not getting back to you. I thought I did reply.

Your heating (electric) speed is fine. we so leave that be.

The cooling/heat pump speed is cranked all the way up there. so you can set the switch 6 to 0, 7 to 1, 8 to 0.

I was wondering if the T-stat Aux, and E is wired by itself, and at the air handler Aux is to W1 at air handler, and E to W2 at the air handler?

Jay, On the thermostat, Aux and E have separate wires. Is that correct?

I don't know how the air handler is wired. I can't check it now since my husband has just had surgery and the air handler is in our crawl space.

When the heat is on the air coming out of the register is too strong. Will lowering the cooling/heat pump speed (by setting switch 6 to 0, 7 to 1 and 8 to 0) lower the velocity of the air coming out of the register when heat is on?

Jay, On the thermostat, Aux and E have separate wires. Is that correct?
Ok, sounds like it's wired up right.

I don't know how the air handler is wired. I can't check it now since my husband has just had surgery and the air handler is in our crawl space.
Wish him quick recovery.

When the heat is on the air coming out of the register is too strong. Will lowering the cooling/heat pump speed (by setting switch 6 to 0, 7 to 1 and 8 to 0) lower the velocity of the air coming out of the register when heat is on?
Correct. Right now, your blower is moving a lot of air, and when the speed is changed to the new set point the air flow is going to be a little bit slower, so it will help warm up the air flow a little bit better.

Thank you so much for your help. It has taken me 4 years to solve this problem - first to convince my husband that there WAS a problem, then to find someone to solve it. Really appreciate your information!

Glad to help.

We could go one more notch lower if we have to, but I don't want to do it unless we must have to do it.

Jay, Thanks, will touch base with you after the adjustment.

Jay, Yesterday we did the adjustment to the dip switches as you suggested (changed 7 to 1 position). If there is any difference, it is only very slight. Agree that we need another adjustment to lower the speed of the blower. What adjustment should be made to the dip switches to further slow the speed of the blower?

Thank you for your help!!

We have adjusted the #7 dipswitch to position No. 1 (on) as suggested by Jay. However, there is very little or no difference in the flow of air from the air handler. We would like to adjust the air flow down some more and would like to know how to do that. We live in Kentucky and lowering the flow will hopefully make our house feel warmer. The dip switches are now set at: #1 is on;
#2 is off;
#3 is on;
#4 is off;
#5 is off;
#6 is off;
#7 is on;
#8 is off.

Thank you for your help.

Welcome back.

I didn't get your last reply, and sorry I didn't catch it right away.

I"ll have to go back and find the manual for your unit.

Will post back when I find it.

Ok, set 8 to 1.

I won't go any lower than that..

I am guessing your system is oversized, or ductwork is undersized.

Jay, Thanks for your reply. Will let you know the results of this adjustment. Appreciate your help!!

Jay, we made the adjustment as you suggested and the heat pump/air handler is finally working perfectly. Thank you so much for your help!!!

Glad to help, and good to hear things are better now.

Thanks for the update!