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  1. #1
    Join Date
    Aug 2004
    Location
    Chapel Hill
    Posts
    73

    Heat pump thermostats

    I am working on a Goodman 3 ton heat pump and
    I notice there is a B port and O port for heat pump t-stat.
    I know that O will be energized the 3 ways reversing valve during cooling mode. Does B work the other way around? which B will energized during heat mode??
    Is all reversing valve work the same way, which only energized during cooling mode?

  2. #2
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,512
    yes b energizes the rv in heat mode mainly ruud/rheem
    We really need change now

  3. #3
    Join Date
    Jul 2013
    Location
    Harrisburg, PA
    Posts
    257
    Depends on the manufacturer. Rheem, Ruud, and their subdivisions were notorious for the reversing valve energizing in heating. I think they've switched and pretty much any new heat pump reversing valve energizes in cooling, which is the "O" terminal. The "B" terminal was used on older stats for energizing in heat. Now, pretty much all stats give you the option of how the reversing valve energizes in the installer options.

  4. #4
    Join Date
    Aug 2004
    Location
    Chapel Hill
    Posts
    73
    Thanks guy.

  5. #5
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Last Ruud unit I worked on still energized the reversing valve in heat. Rheem too.
    Remember, Air Conditioning begins with AIR.

  6. #6
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    3,948
    Quote Originally Posted by Kevin O'Neill View Post
    Last Ruud unit I worked on still energized the reversing valve in heat. Rheem too.
    +1, I have yet to run into a Rheem/Ruud that energizes in cool.

  7. #7
    ive got a question very similar to this. installed a new comfortsense tstat with new lennox heat pump and air handler. reversing valve wouldnt energize ( allow cooling). i double checked wiring and programming and didnt find anything wrong. condemned tstat and replaced with same thing, all seems to work fine
    but here is the kicker. very next week did essentially same system changeout and it does same deal. am i missing something obvious or did i find two bad tstats in a row?

  8. #8
    Join Date
    May 2008
    Location
    OKLAHOMA
    Posts
    99
    Somewhere a jumper may need clipped...

  9. #9
    Join Date
    Jun 2009
    Location
    South Carolina
    Posts
    403
    Quote Originally Posted by 54regcab View Post
    +1, I have yet to run into a Rheem/Ruud that energizes in cool.
    x2 weatherking also

    Also some of the older amana models energized in heat. I think.

  10. #10
    Join Date
    Jul 2013
    Location
    Harrisburg, PA
    Posts
    257
    Quote Originally Posted by klee7013 View Post
    x2 weatherking also

    Also some of the older amana models energized in heat. I think.
    I found out about weathering the hard way haha! They're a sub company of rheem/ruud I think?

  11. #11
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    3,948
    Quote Originally Posted by CoolShowers View Post
    I found out about weathering the hard way haha! They're a sub company of rheem/ruud I think?
    Also Thermalzone and a few others.

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