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  1. #1
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    Default heat pump or not?

    I reported this unit as an AC unit. Not a heat pump. An HVAC guy later told the client it was a heat pump that was not functioning in the heat mode. During the initial, inspection, I concluded AC only mainly because I did not see a reversing valve anywhere on the unit, not even in the service panel area. Also, the unit responded to the Tstat for AC but not for heat, and, the Tstat did not have an aux heat setting. These things combined made my initial conclusion as AC only.

    I researched the label an my conclusion is that I was correct, it is an AC only, not heat pump.

    Am I correct?

    http://www.rheem.com/documents/rakb-...ication-sheets

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  2. #2
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    Mar 2007
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    Spring Hill (Nashville), TN
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    Default Re: heat pump or not?

    Looks like AC only....

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
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    Mar 2007
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    Ormond Beach, Florida
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    26,248

    Default Re: heat pump or not?

    Maybe, at some time in the past, some tech (the one saying it is a heat pump) added a reversing valve, changed the thermostat, etc and said he changed it to a heat pump?

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  4. #4

    Default Re: heat pump or not?

    Quote Originally Posted by John Dirks Jr View Post
    I reported this unit as an AC unit. Not a heat pump. An HVAC guy later told the client it was a heat pump that was not functioning in the heat mode. During the initial, inspection, I concluded AC only mainly because I did not see a reversing valve anywhere on the unit, not even in the service panel area. Also, the unit responded to the Tstat for AC but not for heat, and, the Tstat did not have an aux heat setting. These things combined made my initial conclusion as AC only.

    I researched the label an my conclusion is that I was correct, it is an AC only, not heat pump.

    Am I correct?

    http://www.rheem.com/documents/rakb-...ication-sheets
    I look for 4 lines, if 2 than AC only, 4 heat pump.

    Steve


  5. #5
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    Default Re: heat pump or not?

    Do all heat pumps have reversing valves and should they always be visible to us? I did an inspection a few months ago that had a new system. It was heat pump with natural gas as aux heat. Its weird because in my area that doesn't really make sense.

    But anyway, I originally thought it was an AC because I could not see a reversing valve. It was in fact a heat pump. So, if it has a reversing valve, where was it hiding?


  6. #6

    Default Re: heat pump or not?

    The Rheem site information seems to indicate it is an AC unit. No mention of heat pump capabilities. Googled "Rheem rakb-024jaz"


  7. #7
    Join Date
    Jul 2013
    Location
    Arkansas
    Posts
    5

    Default Re: heat pump or not?

    It is the condenser for a conventional split ac (not heat pump) system with a cooling capacity ranging from 22,800 btu to 23,800 btu depending on which evaporator coil it is matched with.
    These are now hecho in Mexico.


  8. #8
    Join Date
    May 2011
    Location
    Clarkesville, Georgia
    Posts
    35

    Default Re: heat pump or not?

    Quote Originally Posted by Stephen Gaudet View Post
    I look for 4 lines, if 2 than AC only, 4 heat pump.

    Steve
    4 of what kind of lines?


  9. #9
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    Mar 2007
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    Philadelphia PA
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    Default Re: heat pump or not?

    Quote Originally Posted by John Dirks Jr View Post
    ...It was in fact a heat pump....
    How did you become convinced that it really is a heat pump?

    - - - Updated - - -

    So, was there no heat in this house? Or just straight electric in the air handler?

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  10. #10
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    Nov 2011
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    Oregon, USA
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    333

    Default Re: heat pump or not?

    Quote Originally Posted by Stephen Gaudet View Post
    I look for 4 lines, if 2 than AC only, 4 heat pump.
    Steve
    Sorry, but that's not necessarily true. I had a new Trane heat pump installed last year, and it has zero exterior lines, other than electrical and thermostat. Heats and cools like the dickens.


  11. #11
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    Mar 2007
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    Philadelphia PA
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    3,177

    Default Re: heat pump or not?

    Quote Originally Posted by BridgeMan View Post
    Sorry, but that's not necessarily true. I had a new Trane heat pump installed last year, and it has zero exterior lines, other than electrical and thermostat. Heats and cools like the dickens.
    The unit in question is part of a split system. Are you saying you had a similar unit installed that didn't have any refrigerant lines outside? Not sure how that would work.

    Also, not sure about the "four lines" post. All the heat pumps I've seen have two lines, just like a split system AC condenser.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  12. #12
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    Default Re: heat pump or not?

    Quote Originally Posted by John Arnold View Post
    The unit in question is part of a split system. Are you saying you had a similar unit installed that didn't have any refrigerant lines outside? Not sure how that would work.

    Also, not sure about the "four lines" post. All the heat pumps I've seen have two lines, just like a split system AC condenser.
    I believe he is referring to the low voltage control lines. (Red-28v, Yellow-compressor, Orange-four way valve, blue-common).

    The beatings will continue until morale has improved. mgt.

  13. #13
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    Default Re: heat pump or not?

    Quote Originally Posted by Vern Heiler View Post
    I believe he is referring to the low voltage control lines. (Red-28v, Yellow-compressor, Orange-four way valve, blue-common).
    Alright then. Thanks.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  14. #14
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    Default Re: heat pump or not?

    Quote Originally Posted by John Dirks Jr View Post
    Do all heat pumps have reversing valves and should they always be visible to us? I did an inspection a few months ago that had a new system. It was heat pump with natural gas as aux heat. Its weird because in my area that doesn't really make sense.

    But anyway, I originally thought it was an AC because I could not see a reversing valve. It was in fact a heat pump. So, if it has a reversing valve, where was it hiding?
    Dual fuel, is what I have in my home; heat-pump with gas furnace. Makes a lot of sense to have as I can use the heat-pump in the spring and fall when there is little load and the gas furnace in the cold winter. The wife forces it to the gas all the time as she likes the fast heat. Trane hides the valve behind the cowling and you have to stand on your head to see it through the slits.
    This might have been a dual fuel system and the heat-pump did not come on because; the t-stat was either not configured correctly, wasn't dual fuel capable, or was broken.

    The beatings will continue until morale has improved. mgt.

  15. #15
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    Default Re: heat pump or not?

    Quote Originally Posted by John Arnold View Post
    How did you become convinced that it really is a heat pump?

    - - - Updated - - -

    So, was there no heat in this house? Or just straight electric in the air handler?
    Just so the situation does not get confused. The original unit of which I started this thread over was an AC unit. (post #1) The air handler had electric resistance as the only heat source.

    The other situation I mentioned (post #5) was a heat pump. I confirmed so when it came on during the heat mode of the thermostat. There was a delay as often the case and threw me off guard.

    In the end, both systems were properly identified in the reports.


  16. #16
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    May 2011
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    Clarkesville, Georgia
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    Default Re: heat pump or not?

    Quote Originally Posted by Vern Heiler View Post
    I believe he is referring to the low voltage control lines. (Red-28v, Yellow-compressor, Orange-four way valve, blue-common).
    Ok makes sense now.


  17. #17
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    Oregon, USA
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    Default Re: heat pump or not?

    Quote Originally Posted by John Arnold View Post
    The unit in question is part of a split system. Are you saying you had a similar unit installed that didn't have any refrigerant lines outside? Not sure how that would work.
    I didn't say I had a "similar system" installed, just a new Trane heat pump. It's a Model 4WCY4-1G-12, 14 SEER Single Packaged Heat Pump. Rated at 2.5 ton, but convertible up to 5 ton. No exposed refrigerant lines of any kind on the exterior; they are all buried inside the sheet metal housing.


  18. #18
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    Southern Vancouver Island
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    Default Re: heat pump or not?

    Hey John, re: your question is the reversing valve always visible I say No, sometimes it is not visible without removing sheet metal or a vinyl jacket over the components. One more thing to be wary of.

    Throw in a programable thermostat and you can really get bewildered. What I do then is hit the mode button and see what the system has to offer. (My little secret which I now share with y'all).

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  19. #19
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    Mar 2007
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    Corpus Christi, TX
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    615

    Default Re: heat pump or not?

    The only reason some people get lost in thought is because it's unfamiliar territory.
    - Paul Fix

  20. #20
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    Jan 2014
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    FL
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    1

    Default Re: heat pump or not?

    Quote Originally Posted by Thom Walker View Post
    Easy way to verify if its a heat pump or not. Check the thermostat. If it has "heat, cool and emergency heat" settings, it's a heat pump. If it has heat and cool only, it isn't

    - - - Updated - - -

    Quote Originally Posted by Thom Walker View Post
    Easy way to verify if its a heat pump or not. Check the thermostat. If it has "heat, cool and emergency heat" settings, it's a heat pump. If it has heat and cool only, it isn't.


  21. #21
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    Default Re: heat pump or not?

    Quote Originally Posted by Desmond Langton View Post
    Easy way to verify if its a heat pump or not. Check the thermostat. If it has "heat, cool and emergency heat" settings, it's a heat pump. If it has heat and cool only, it isn't

    - - - Updated - - -



    Easy way to verify if its a heat pump or not. Check the thermostat. If it has "heat, cool and emergency heat" settings, it's a heat pump. If it has heat and cool only, it isn't.
    And then pray some home owner/handyman hasn't installed the wrong thermostat, cause you may be asked to install a heat pump you said was working fine when it was an A/C unit .

    The beatings will continue until morale has improved. mgt.

  22. #22
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    Nov 2011
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    Oregon, USA
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    Default Re: heat pump or not?

    Correction: Make that "homeowner/unhandyman."

    There are thousands of them out there. Some of whom even charge a tidy fee for their misdeeds. I think I could write a book about all of the junk work I've come across in the last 40+ years.


  23. #23
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    Default Re: heat pump or not?

    Quote Originally Posted by BridgeMan View Post
    Correction: Make that "homeowner/unhandyman."

    There are thousands of them out there. Some of whom even charge a tidy fee for their misdeeds. I think I could write a book about all of the junk work I've come across in the last 40+ years.

    Amen, amen, amen. Check the model number when available.

    • I also do the following: set to off.
    • Check that the outside unit is off.
    • Set to heat and crank it up. Walk outside and the condensing unit should be running. Record air temperature at register after about 10 minutes.
    • Turn it off. Walk outside and the unit should be off.
    • Set it to em heat. Verify that you have heat. Walk outside and the unit should not be running.


    The only reason some people get lost in thought is because it's unfamiliar territory.
    - Paul Fix

  24. #24
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    Mar 2007
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    Ormond Beach, Florida
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    Default Re: heat pump or not?

    Quote Originally Posted by Thom Walker View Post
    Set it to em heat. Verify that you have heat. Walk outside and the unit should not be running.
    ... unless it is a heat pump, then it should be running, and it should be blowing cold air instead of hot air out the condenser unit fan discharge.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  25. #25
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    Maryland
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    Default Re: heat pump or not?

    On heat pump systems, I always test the electric resistance heat of the air handler first. If you run the heat pump first, it's sometimes hard to tell if the aux is adequate or not since the heat pump has already warmed system components up.


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