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Old 12-13-2009, 09:11 PM   #1
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Thermostat wiring question


I have a carrier heat pump with a honeywell thermostat. I just purchased a digital, programable thermostat and needed assistance on how to wire the new thermostat.
Current Honeywell thermostat wiring is as follows:

Terminal Wire_Color
-------- -------------------
G Green
C Blue
R Red
W1-Y Yellow (W1 & Y terminals are jumpered)
W2-E White (W2 & E terminals are jumpered)
B Black
O Orange
===================================

New TS21 thermostat
Terminals
I2
I1
RC
DH
H
C
Y2
RH
OBW
W2
G
Y1
============================
here's a link to the TS21 manual:
http://www.diversitech.com/literatur...hermostats.pdf

Help please
Ken

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Old 12-13-2009, 10:22 PM   #2
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Thermostat wiring question


Post the model number of your old stat.
If the subbase has a Q674?-???? number, post that as well.

Is this controlling a zone system? It is unusual for both O and B to be in use unless B is actually E or C , and this is not your case.

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Old 12-14-2009, 05:58 AM   #3
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Thermostat wiring question


The old thermostat model number is T8411R (Honeywell).

Here's a link to the manual for it.

http://customer.honeywell.com/Techli...0s/69-1037.pdf

Ken
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Old 12-14-2009, 07:25 PM   #4
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Thermostat wiring question


Quote:
Originally Posted by Houston204 View Post
Post the model number of your old stat.
If the subbase has a Q674?-???? number, post that as well.

Is this controlling a zone system? It is unusual for both O and B to be in use unless B is actually E or C , and this is not your case.
No, this is not controlling a zone system.
See my other response for more details on the existing Honeywell thermostat.
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Old 12-14-2009, 07:32 PM   #5
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Thermostat wiring question


RH (jumpered to RC-red
C-blue
Y1-yellow(DO NOT JUMPER TO W)
W2-white
OB/W-orange
G-green


Check your air handler. You should not need the wire that was attached to B on your old thermostat.
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