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Old 01-01-2010, 10:46 AM   #1
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Thermostat wiring help


I have a new 2h/1c heat pump goodman system and am trying to install a honeywell Th6220D thermostat.
I currently have a honeywell RTH6400 thermostat that I replaced myself last spring and wired the 7 wires as the following:
White-W
Green-G
Yellow-Y
Red-R
Blue-Taped off
Orange Taped off
Brown Taped Off

My HVAC installer said the RTH6400 won't allow heat. It ran cool all summer long no problems, but now Im trying to install the new TH6220D thermostat so I can have heat.
The new thermostat has the following
Page 5 (2h/1C section):
http://customer.honeywell.com/techli.../69-1920ES.pdf
RC--Power--Red (this is also on a jumper to R)
Y compressor contractor ?????
C 24Vac Common ?????
O/B changeover Valve ????
G Fan Relay Green
Aux Auxilary heat Relay ????
E Emergency heat ????
L Sends output to emerg. heat ?????
I need to know where to connect the remaining 5 wires.

my house is 12 years old and the hvac was installed last year if that helps.

Thank you for any help

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Old 01-01-2010, 11:05 AM   #2
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Thermostat wiring help


Need to write down which colors go to which terminals in the heat pump and furnace then connect the same to the thermostat. Compressor contactor is Y. C is common on the furnace and HP boards. O is reversing valve. Aux is W on the furnace,also run w from HP back to W on furnace for defrost. Put a jumper between E and aux so the emergancy setting brings on the back up heat.

Also make sure the installer didn't put a jumper between O and R or O and Y on the heat pump. Has to have something in there or the heat pump would have been in heat mode all summer.


Last edited by Marty S.; 01-01-2010 at 11:09 AM. Reason: added info
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Old 01-01-2010, 11:08 AM   #3
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Thermostat wiring help


No furnace I am in FL.

Air handler, heat pump and heat strip with outside condenser.

I have no idea where to get the info you asked to write it down. Would it be noted on my air handler somewhere?
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Old 01-01-2010, 11:22 AM   #4
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Thermostat wiring help


Air handler with heat strips is also known as an electric furnace. Inside the heat pump and air handler are wiring diagrams. Take the access doors off and you will see them.
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Old 01-01-2010, 12:13 PM   #5
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Thermostat wiring help


I unscrewed the front panel but it wasnt budging off of there and I dont really want to mess something up.

If my existing thermostat has

Green-G(stays the same)
Yellow-Y compressor contactor this should stay the same.
Red-R(will connect to Rc(it is jumped))

So I just need help with the Blue, Brown, Orange and White wire
I have the following terminals left
C(optional with batteries)
Aux
E
L


Im thinking Orange goes to the O/B
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Old 01-01-2010, 12:42 PM   #6
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Thermostat wiring help


O to orange would be a safe assumption. W to aux with a jumper between aux and and E would also be likely. Hopefully those wires are hooked to something in the air handler and heat pump or it won't work .
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Old 01-01-2010, 12:50 PM   #7
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Thermostat wiring help


Ok, I opened the panel, I was opening the wrong one initially

Inside the panel it looks like this
White-E
Blue-C
Yellow-Y
Green-G
Orange-O
Red-R

The only question seems to be the brown wire. It was connected to a W/W2

I cant get the pic to show in this picture, check the pic please:
http://img682.imageshack.us/i/img1727q.jpg/
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Old 01-01-2010, 12:51 PM   #8
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Thermostat wiring help


Goodman heat pumps energize O on cooling,as do most brands. Since you had cooling this summer the O terminal has to be jumpered in the heat pump or air handler. That will need to be corrected or the system will be cooling when you're trying to heat. Sorry to say it but you need to get those pannels off for propper wiring.
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Old 01-01-2010, 01:09 PM   #9
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Thermostat wiring help


You will notice the orange wire twisted in the picture, the HVAC tech told my wife when he informed us the thermostat installed now wouldnt work is we could undo the orange cord to get heat and plug it back in to get cold in the summer with the current therm I am replacing. This was reiterated to me by the wife so it might not be exactly what he said but maybe this helps the assessment

So if the brown wire is connected to w/w2 inside the handler would that translate to the Aux terminal on the thermostat?

Last edited by sords; 01-01-2010 at 01:20 PM.
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Old 01-01-2010, 01:44 PM   #10
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Thermostat wiring help


W1 is one bank of electric elements and W2 is a second bank. Wire nut those two together with aux from the thermostat.
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Old 01-01-2010, 01:45 PM   #11
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Thermostat wiring help


I wouldn't hook any wires up. Until I KNEW FOR SURE where they were connected in both units.

To do so. is risking burning OUT some EXPENSIVE controls that WOULD NOT be covered under warranty.

Work on taking the panel off. Sure it could take a little time. But it may also save you several hundred dollars in parts. And keep your wife from smacking you when she is cold on a holiday weekend.

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