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Upgrading thermostat on Carrier HP packaged 5 ton unit. 38YCBD6D-301 Outside: FB4ANF060 Air Handler: TSTA1CCNAHPO1 Thermostat New T-Stat: Diversitech 675-ts21 Wiring legends do not agree! Old T-Stat used S1 S2 O/W2 R Y/Y2 G C and W/W1 New Stat: Terminal Equipment Wire Y1 1ST HP & AC Yellow G Fan Green W2 1ST stage Furnace White OBW Reverse Valve Orange RH 24v RED Y2 2nd HP & AC Unknown C Common Blue H Humidity Control Unknown DH Dehumididity Control, Variable Fan Unknown RC 24v Unknown I1 & I2 Not Used The A/H does not list any heat installed. Thanks for any help, CLEVE

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  • Richard Johnson PE
    Richard Johnson PE May 11, 2010

    s1 and s2 are for the outside air temperature sensor. Not sure if you have one installed. Quck question: Could the model of the air handler be FK4 not FB4? Does this air handler have an electric heating unit installed? As soon as you post the answers, I can post the wiring diragram.

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6ya6ya
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Posted on Jan 02, 2017

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  • 233 Answers

SOURCE: Wiring Trane/Honeywell TH8320U

use the outside designations for heat pump, and inside for standard, I would assume a heat pump since you have more than five wires attached to it now. Use the colors of the wire to match to the designations, use tan for y2, black for w2 rc and rh should already have a factory jumper. I would have to trace out the "U" and see where it terminates, I have not seen a bare wire on a stat in 27 years of doing this. before powering, verify the tan and black at the indoor unit circuit board and see if they are landed on the terminals designated at the stat. hope this helps

Posted on Jul 27, 2009

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billyvangogh
  • 108 Answers

SOURCE: Installing thermostat - extra wire?

you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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Posted on Nov 01, 2009

heatman101
  • 43501 Answers

SOURCE: No Auxiliaty heat with new thermostat

The Vision Pro is a great t-stat and I have installed many of them with great results. I am wondering though if it is set up correctly. Did you go in and make sure that it is set for heat pump and for 2 stage heating? Look on the instructions how to get into the advance installer options. Go through that meanu and make sure that everything ig set correctly for your type of heating system and that it is set for 2 stage heating. From what you have here and I can tell the wiring should be okay that is why I think that it is in the t-stat programming.

Posted on Nov 16, 2009

heatman101
  • 43501 Answers

SOURCE: Do not know what color codes of the new thermostat

Hi,
I can give you a general idea, but unless I know what colors you have and where they are hooked at the furnce/airhandler I am shooting in the dark here.
The R is usually red, the W1 would be white, the Y would be yellow and the G green. in your case where the Y and W1 are together the W2 is probably the white. The X3 is whatever is left over, probably black or blue.
If you shorted the wires you probably tookout a fuse or the transformer in the airhandler/furnace. That will need to be replaced before anything will work.
The R and the X are the ones that you really need to watch that they don't short out, and the R needs to not touch anything metal.
It is best to kill the power to the airhandler/furnace before changing any t-stat then you don't need to worry abut killing anything.

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

Posted on Nov 27, 2009

  • 149 Answers

SOURCE: where does the W2 wire go?

w2 wire is second stage heat does your furnace have two stages.look at gas valve it would have 2 valves/ sol w2 will go to w2 on stat. if a single stage furnace w2 is not used

Posted on Jan 25, 2010

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