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Old 12-23-2011, 09:40 PM   #1
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New Thermostat wiring


Currently I have a Honeywell 3220D1028 here is the manual http://www.thermostatshop.com/manual...n%20manual.pdf

I have 6 wires coming into it. (Y2, W2 Jumpered) G, W, C, Y , (R, RC Jumpered)


My new thermostat is a little different the O/B terminals are separate. But on the old one the O/B is the same terminal

The new thermostat has the following: O, B, G, C, R, Y1, E/Y1

Where do I hook the wires on the new one? Does the Orange go on O or B now?


Last edited by jake556; 12-23-2011 at 10:03 PM.
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Old 12-23-2011, 11:44 PM   #2
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The O and the B are the terminals that engage the heat pump's reversing valve. I believe that Ruud and Rheem are the only heat pump system's that require B which means while on call for heat the reversing valve is energized through the B terminal, all other brands use O and energize the reversing valve on cool.

You may need to verify that. Do you have the manual for the heat pump?

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Old 12-23-2011, 11:52 PM   #3
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Y to Y1, W2 to E, emergency heat which acts as either emergency all on it's own when you set emergency heat on or second stage to back up first. Not sure about your second stage cooling/Y2. Not even sure why they're jumpered together in the first place as Y(2) is cool and W(2) is heat.
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Old 12-24-2011, 07:23 AM   #4
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Quote:
Originally Posted by Doc Holliday View Post
The O and the B are the terminals that engage the heat pump's reversing valve. I believe that Ruud and Rheem are the only heat pump system's that require B which means while on call for heat the reversing valve is energized through the B terminal, all other brands use O and energize the reversing valve on cool.

You may need to verify that. Do you have the manual for the heat pump?
I have an Trane XL13c model # 2WCX3036A1000AA. So this mean I need to hook up to O instead of B?

I had is on B it heated fine moved it to O and it is still heating fine? Can someone explain this please!

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Originally Posted by Doc Holliday View Post
Y to Y1, W2 to E, emergency heat which acts as either emergency all on it's own when you set emergency heat on or second stage to back up first. Not sure about your second stage cooling/Y2. Not even sure why they're jumpered together in the first place as Y(2) is cool and W(2) is heat.
Yeah i don't understand why they jumpered them either. but y2 and w2 were jumpered.

Last edited by jake556; 12-24-2011 at 07:48 AM.
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Old 12-24-2011, 08:26 AM   #5
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when you switched the o to the b was the outside unit running or was it the second stage heat?
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Old 12-24-2011, 06:40 PM   #6
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when you switched the o to the b was the outside unit running or was it the second stage heat?
I think it's only single stage I could be wrong
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Old 12-24-2011, 07:11 PM   #7
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I think it's only single stage I could be wrong
Electric air handler or gas furnace, where the blower is? Inside unit.

usually heat pumps systems have a back up aka second stage. W2 is the terminal for this. You had it wired on the old stat.
All you need to do to check is move the wire from O to B and back again and each time when it's heating go outside and see if the unit is running. Whichever terminal that is not bringing on the outside unit yet your home is heating would determine that the back up heat is initiated. Whichever terminal that brings on the outside unit is what it's supposed to be on, most likely O. That is factory default according to the manual.

Now if the outside unit comes on right away with either of those two then I'd still leave it on O.

I'm betting you have electric heat strips in your air handler, back up. Could be natural gas but most times it's electric.
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Old 12-24-2011, 10:01 PM   #8
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Quote:
Originally Posted by Doc Holliday View Post
Electric air handler or gas furnace, where the blower is? Inside unit.

usually heat pumps systems have a back up aka second stage. W2 is the terminal for this. You had it wired on the old stat.
All you need to do to check is move the wire from O to B and back again and each time when it's heating go outside and see if the unit is running. Whichever terminal that is not bringing on the outside unit yet your home is heating would determine that the back up heat is initiated. Whichever terminal that brings on the outside unit is what it's supposed to be on, most likely O. That is factory default according to the manual.

Now if the outside unit comes on right away with either of those two then I'd still leave it on O.

I'm betting you have electric heat strips in your air handler, back up. Could be natural gas but most times it's electric.
It is definetely electric heat strips, no gas
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Old 12-24-2011, 10:17 PM   #9
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How that works is if the system has been running in heat mode for ten minutes yet still hasn't satisfied the stat then the stat calls for second stage stage to come on to get the temperature up. I think it's ten minutes, something like that. Not sure if that time alloted before second stage comes on can be changed or not and not sure of the temperature rise the stat requires or has to obtain either but you get the general idea. If first stage runs too long without bringing the temp up, second stage kicks in to assist.

Or you can manually turn on emergency heat, electric heat strips. Good to have seeing as how things have been known to go wrong with heat pumps such as the defrost board goes bad or the reversing valve quits working.

You still have heat without the heat pump.
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Old 12-25-2011, 05:26 AM   #10
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I'm confused. You said you currently have a TH3220D. But posted a link to a TH6220. The 3220 uses a separate B and O terminal, the 6220 uses a combined W1/O/B terminal.

Post the model number of your old thermostat, and the model number of your new thermostat. Along with its brand, if its not a Honeywell.
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Old 12-25-2011, 10:09 AM   #11
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Originally Posted by beenthere View Post
I'm confused. You said you currently have a TH3220D. But posted a link to a TH6220. The 3220 uses a separate B and O terminal, the 6220 uses a combined W1/O/B terminal.

Post the model number of your old thermostat, and the model number of your new thermostat. Along with its brand, if its not a Honeywell.
Sorry if I was confusing here is the info:

OLD Thermostat: Honeywell TH6220D1028

NEW Thermostat: Robertshaw Model 9701i
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Old 12-25-2011, 10:31 AM   #12
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Looks like that Robertshaw is a single stage stat...

http://www.thermostatsales.com/9701i.pdf
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Old 12-25-2011, 10:34 AM   #13
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Why did you change it in the first place?
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Old 12-25-2011, 10:44 AM   #14
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Why did you change it in the first place?
I was suspect that it was faulty at times it was 74+ degrees in the house with the thermostat set at 72 and still calling for heat.

Ever since I changed to the RS one it seems to be working like a dream.
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Old 12-25-2011, 10:49 AM   #15
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Has running Aux heat with the heatpump increased the electric bill?

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