Intermittent Compressor problem
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  1. #1

    Lightbulb Intermittent Compressor problem

    Thanks ahead for any advice you can offer. In April, our fan blower motor and inside coil was bad so we ended up replacing the entire air handler. The new air handler is is a RUUD 5 ton unit RHLL series. Our outer unit is an Amana Heat Pump. RHE48a2D. Soon after the air handler was installed, we would notice periods of time where it did not seem to be cooling. This has gone on since April. Service techs have been sent out. They have checked the coolant, everything is fine, the compressor is not "overamping" (not sure what that means) One technician felt that the outside fan motor was going out, so we replaced that at $ dollars and it is still doing it. I've replaced the thermostat. Many times by the time the technician gets her it has started working again. I have determined that when I notice this occurring the air temperature out of the register is 75 degrees. When the AC is working fine, the air temp out of the register is about 68. This is based on a candy thermometer that now resides in the register in the kitchen. I saw a similar problem on Youtube regarding a Carrier brand and a hard start kit due to a TXV valve. I am an ER nurse by trade, so I could tell you the physiology of the heart, but have no idea what this stuff means. Hats off to you that do. The dealer is talking that we may just need to buy a new outdoor unit, but if I am going to spend $$ on a new outdoor unit, I want a good reason why I need to. So far, they say that the compressor is good. No one has even mentioned anythiing about an expansion valve, etc. If anyone could point me in the right direction, I would be grateful.
    Last edited by beenthere; 07-13-2012 at 05:11 AM. Reason: price

  2. #2
    Join Date
    Dec 2002
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    are you sure they didn't mix a r-22 system with a r-410 system?
    how old is the heat pump (o.d. unit)?
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  3. #3
    Join Date
    Jul 2006
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    Very well could need a real start kit ,And if the dealer cant sort it out i would call somebody else,

  4. #4
    Yes the outdoor unit is an R22 and the indoor is R410. They said that they were compatable. Is this not the case? It did the same thing last night and I turned the unit off. Waited about ten minutes and turned it on again. (this has helped in the past) When it came back on I went outside and confirmed that the compressor was running. I came back inside and was in the bathroom which is right next to the outdoor unit. I heard the compressor kick off but the indoor unit kept running. It seemed like the compressor tried to start again and stopped immediateely with a loud thud. When I went outside, nothing was running on the outdoor unit. I went back inside. Turned the thermostat to heat and let it run for about 2 minutes. (worked fine) I then switched the therm over to cool. It went through its wait period and the ac began to work. It worked all night and kept the house at 67 degrees. I am grateful for any advice you can give. Thank you.

  5. #5
    Join Date
    Jun 2005
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    Quote Originally Posted by HotNpissedNTX View Post
    Yes the outdoor unit is an R22 and the indoor is R410. They said that they were compatible. Is this not the case? It did the same thing last night and I turned the unit off. Waited about ten minutes and turned it on again. (this has helped in the past) When it came back on I went outside and confirmed that the compressor was running. I came back inside and was in the bathroom which is right next to the outdoor unit. I heard the compressor kick off but the indoor unit kept running. It seemed like the compressor tried to start again and stopped immediately with a loud thud. When I went outside, nothing was running on the outdoor unit.

    I went back inside. Turned the thermostat to heat and let it run for about 2 minutes. (worked fine) I then switched the therm over to cool. It went through its wait period and the ac began to work. It worked all night and kept the house at 67 degrees. I am grateful for any advice you can give. Thank you.
    You have a 5-Ton air handler, what's the tonnage of the heat pump?

    What large city do U live near? So, we know the summer design.

    What is the temp of the indoor air temp & humidity when the supply air is a high 68F? The airflow CFM might be set too high.

    The heat pump check-valves may not be opening & closing as they should, when you cycled to heat mode they may have worked okay; that problem could cause compressor problems.

    If U don't have one, get a humidity gauge, that is very important information U need.

    To be comfortable, Normally U should never have to operate cooling mode below 70F, usually 75F at 50% relative humidity.

  6. #6
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    Quote Originally Posted by HotNpissedNTX View Post
    Yes the outdoor unit is an R22 and the indoor is R410. They said that they were compatible. Is this not the case? .
    That Ruud air-handler comes with 410A expansion valve "welded on" if they did not change it out to a R-22 valve there's your issue.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  7. #7
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    As Cat mentioned, you probably need a start kit added to outside unit.

  8. #8
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    Quote Originally Posted by wahoo View Post
    As Cat mentioned, you probably need a start kit added to outside unit.
    Yes, and that should also help fix the expansion valve issue if they did not change it out, but they said that they were compatible
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  9. #9
    Join Date
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    Quote Originally Posted by Mr Bill View Post
    That Ruud air-handler comes with 410A expansion valve "welded on" if they did not change it out to a R-22 valve there's your issue.
    X2

  10. #10
    Thank you for all of the feedback. This will give me various possibilities to go back to the dealer. What I do depends on what they do. To answer some of the questions, I live in san antonio. The outdoor unit is a 4 ton unit. The house is about 2000 sq ft. In regards to the temp. What we determine as "comfortable"might not be what the normal person considers comfortable. My wife and I used to be OR nurses, where the temp usually is kept about 65 degrees. You get used to this and come home to a 75 degree house and it feels hot. So we usually keep the temp at 68 through the night and 73 during the day. When the compressor stops, we first notice the humidity, the temp will be the same, but u can tell a difference in the humidity. So far today, it hasn't acted up at all. I am going to talk to the owner on Monday. I'm tired of this. Thanks to all of you. Wish there was some way to repay, but unless you need Health advice or advice on a Harley, I wouldn't be much help.

  11. #11
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    This is one reason that its best to replace the system both indoor and outdoor units at the same time

  12. #12
    If it turns out that it needs a hard start kit, is there one you would reccomend? The original manual called for one with the model number HSK12a, but this is no longer being made. Does anyone know of one that may be compatable? How are these things sized?
    Thank you.

  13. #13
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    Quote Originally Posted by HotNpissedNTX View Post
    If it turns out that it needs a hard start kit, is there one you would recommend? The original manual called for one with the model number HSK12a, but this is no longer being made. Does anyone know of one that may be compatible? How are these things sized?
    Thank you.
    Are you working on this yourself? and did you verify that you have a R-22 TXV on your air handler? I am a Ruud dealer and I know that AH come with a 410A TXV, if you don't verify this, your can stick in 20 Start Assist's and there never going to fix your problem. The 410A TXV works off a LOT! "higher pressures".
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

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