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Old 10-14-2008, 03:37 PM   #1
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Wiring/Programming of a Honeywell TH8320 Thermostat


I recently purchased a Honeywell TH8320 programmable thermostat to bring a little energy efficiency to my new home. I have a Carrier 25HBA3 Base Series split system heat pump with a unit outside, and one indoors (installed up in the attic space above my garage). I detached the previous thermostat and made note of the wire colors and connections, and followed the instructions in the Honeywell manual to the best of my understanding, though I am not finding success in getting the heater to operate.

Here are the connections as per the previous thermostat:

W* --
O -- White Wire
G -- Green Wire
R -- Red Wire
C -- Blue Wire
Y* -- Yellow Wire

*There is a small length (about 1.5") of green wire that seems to be acting as a jumper going from the W terminal to the Y terminal.

When I try connecting my Honeywell TH8320, I am not able to get the heat to turn on. I did something last night that had heat coming on when I had it set to cool, but I decided to completely disconnect all wires from their terminals and start from scratch, though to no avail.

Based on my heat pump, I am assuming that it is a 1H/1C Heat Pump with no auxiliary heat, though perhaps I am mistaken.

My connections to the Honeywell terminal are as follows:
RC and R are connected by a jumper, with the red wire from the wall connected to the R terminal.
C -- Blue Wire
Y -- Yellow Wire
G -- Green Wire
O/B -- White Wire
The small length of green wire is connected to both the Y terminal and the O/B terminal (Since for conventional systems, it shows that the O/B terminal is actually the W terminal).

As for programming, I have the following:
0170 (System Type) = 2 - 1H/1C Heath Pump (No Aux Heat)
0190 (O/B Terminal) = 1 - O/B Terminal controls valve in heating

I think I am so close to having this correct, and I am seeking a little help to get me to a more energy efficient home. Thank you for any assistance and guidance!

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Old 10-14-2008, 04:20 PM   #2
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Wiring/Programming of a Honeywell TH8320 Thermostat



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Old 10-15-2008, 06:19 AM   #3
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Wiring/Programming of a Honeywell TH8320 Thermostat


If you want to use that jumper, put your old stat back on.

If you want to use the new stat, wire it as per its directions.

NO jumper from O/B to Y.

On Carrier, O/B does NOT control valve in heating.
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Old 10-15-2008, 09:45 AM   #4
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Wiring/Programming of a Honeywell TH8320 Thermostat


Quote:
Originally Posted by beenthere View Post
If you want to use that jumper, put your old stat back on.

If you want to use the new stat, wire it as per its directions.
This is where I'd start.
Quote:
Originally Posted by homrjheath View Post
Here are the connections as per the previous thermostat:

W* --
O -- White Wire
G -- Green Wire
R -- Red Wire
C -- Blue Wire
Y* -- Yellow Wire

*There is a small length (about 1.5") of green wire that seems to be acting as a jumper going from the W terminal to the Y terminal.
From my research just this past weekend installing an Aprilaire 4400 air cleaner I had to refresh myself of the colored wires of my thermostat.

W-Controls heating
Y/O-Controls AC (O-heatpump only)
R-Power (RC/Cooling Power & RH/Heating Power) Mine has jumper
C-Common Ground
G-Fan

I also have switches on the back of my thermostat for: Heating system selector, Furnace or Heat Pump selector, & Auto Recover selector.

Consult your manual.
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Old 10-15-2008, 01:30 PM   #5
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Wiring/Programming of a Honeywell TH8320 Thermostat


The TH8320 has no switches.
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