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Old 04-16-2012, 05:51 PM   #1
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O or B reversing valve on my heat pump?


I'm trying to find the answer to something that sounds so simple, but not easily found (at least for me.)

I have a 2004 (I believe) Trane XB12 heat pump model number: 2TWB2060A1000AA

I would like to replace my current thermostat with a Venstar T1700 thermostat. I have seven wires, all different colors, going to the existing thermostat which I took note where they were connected. I have an orange wire going to a "O/B" terminal because it is a heat pump and the same terminal exists on the new thermostat, however the new thermostat has a jumper the original thermostat does not that is to tell the thermostat whether it is for an O reversing valve or a B reversing valve.

Now, for the life of me, I cannot find anything in the heat pump owner's manual that tells me whether I have an O or B reversing valve. The thermostat manual just says:

"…the thermostat jumper is set for an O reversing valve (energized in
cooling) or a B reversing valve (energized in heating)"

How can I find out the simple answer so I know how to set this jumper? Thanks!

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Old 04-16-2012, 07:37 PM   #2
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O or B reversing valve on my heat pump?


Your O terminal needs to be energized with a call for cooling, or as you put it, an "O reversing valve"

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Old 04-16-2012, 07:40 PM   #3
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O or B reversing valve on my heat pump?


On Trasne units your reversing valve is powered by the "O" teerminal.
It was explained to me that it is so incase the SOV coil failed you would still have heating.
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Old 04-16-2012, 11:09 PM   #4
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O or B reversing valve on my heat pump?


funny, my package unit here in Phoenix, acuates the reversing valve only on heat.... I was told it was becuase you never want to be without AC... different parts of the country and different MFGRs do this different!!! LOL
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Old 04-17-2012, 05:06 AM   #5
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O or B reversing valve on my heat pump?


Quote:
Originally Posted by bobinphx View Post
funny, my package unit here in Phoenix, acuates the reversing valve only on heat.... I was told it was becuase you never want to be without AC... different parts of the country and different MFGRs do this different!!! LOL

You have a Rheem/Ruud unit. All of them(residential atleat) energize the RV for heat no matter where in the country it was made for. All other major brands energize the RV for cooling, again it doesn't matter where in the country it was made for.
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Old 04-18-2012, 09:21 AM   #6
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O or B reversing valve on my heat pump?


Thanks for the replies. I just wanted to make sure I understood how to set this thing up correctly before doing the job. I appreciate the input.
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Old 04-18-2012, 09:46 AM   #7
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O or B reversing valve on my heat pump?


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Originally Posted by beenthere View Post
You have a Rheem/Ruud unit. All of them(residential atleat) energize the RV for heat no matter where in the country it was made for. All other major brands energize the RV for cooling, again it doesn't matter where in the country it was made for.

The guys at Century Supply (Rheem/Ruud dealer) say they are the only one's who got it right.
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Old 04-18-2012, 03:53 PM   #8
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O or B reversing valve on my heat pump?


Quote:
Originally Posted by doc holliday View Post
the guys at century supply (rheem/ruud dealer) say they are the only one's who got it right.
lol...
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Old 04-18-2012, 03:57 PM   #9
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O or B reversing valve on my heat pump?


well, for Phoenix, where 80 percent of the heat pump use is in the summer, Rudd/Rheem did indeed get it right!!! LOL

p.s. should be 100 degrees here in Phoenix on april 21st

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