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  1. #1
    Join Date
    Apr 2005
    Location
    Kingston Ontario Canada
    Posts
    1,210
    HI: Recently had my Carrier 38YZA heat pump serviced. It was still cool enough here(south eastern Ontario) that the heat pump was in heating mode. The tech and his apprentice did the usual things like pressure washing out door condensor etc. They hooked up the gauges and to check pressures. They felt it needed a smidgen of 410A. After that I didn't run the system for week and a half until the weather turned much warmer and much more humid. The heat pump went into cooling mode when I fired it up. That's when the problem started. The compressor started to cycle off and on and the unit had trouble bringing the temp down to set point. I believe the compressor was going off on high pressure. Called the company again and they sent a different tech. He said the pressures were not right for cooling. He played with adding more refridgerant, but stated he didn't want to put too much in and would rather have a little less, then too much. He also said he didn't know very much about the system I have Carrier 38YZA and FV4A Fan coil. So they sent a different tech over to check it out. He determined it was the TXV that was shot. They replaced it today and they had the system running for about 20 mins and seemed ok. They charged me 3.5 hours labour to change it. Does this all sound reasonable to you guys?

    Thorton

  2. #2

    charge

    Since freon amount is so critical in these units the best way to charge the system is by weight. Recover all freon and read the neame tag for how many ounces..

    regards
    Kelvin

  3. #3
    Join Date
    Apr 2003
    Location
    California
    Posts
    634
    i agree , recover all 410 and check for leaks with nitro or use existing refrigerant, repair leaks if found. pull vac and have tech weigh in charge compensating for lineset.. I have always totally recharged system with 410 when a leak has occured due to the type of refrigerant [blend]. no leaks great vac no restrictions proper charge..have a nice cool day

  4. #4
    Join Date
    Aug 2003
    Posts
    83
    To answer your question... yes, it sounds reasonable.




  5. #5
    Join Date
    Jun 2005
    Posts
    3
    3.5 hours sounds fair. He would have had to run and get the part. I doubt he would have that on his truck.

  6. #6
    Join Date
    Apr 2004
    Location
    Midwest
    Posts
    2,682
    Sounds right to me also...

    Cant understand how a tech can use "I am not familar with 410-A" as an excuse though.

    Diagnosing a bad TXV would be the same regardless of the type of refrigerant.
    Live each day like it is your last, for one day you will be right!

  7. #7
    Join Date
    Jul 2005
    Posts
    40
    This particular unit is well known to me. Carrier has issued a bulletin recently for that TXV. 410 SHOULD NOT be topped up as it is a blended gas and depending on the leak will leak out at different rates causing a host of other problems in the future. The rate he charged to fix the TXV sounds pretty good. As for the tech that was unsure, there are some guys that just don't see heat pumps.The best way to charge it is by subcooling or superheat. Here in Canada we have to account for every ounce of R22 and 410 that we reclaim or use. So it gets weighed either way. In Canada you have to be a licensed HVAC technician with an ODP card to get your hands on 22 or 410, so reclaiming and filling with new 410 (if there was a leak) as a DIY project is not really an option.

  8. #8
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Can you share the Carrier bulletin number,and content?

  9. #9
    Join Date
    Jul 2005
    Posts
    40
    dash, bulletin #: SMB05-0012, keep in mind this is a Canadian bulletin so you may want to check with Carrier in the U.S. If you want I can scan this and email it to you, just drop me a note at my email address. It is 6 pages long.

  10. #10
    Join Date
    Apr 2004
    Location
    Midwest
    Posts
    2,682
    I also have never heard of this bulletin? factory issued SMB05-0012 is in regards to heat pump reversing valve coils?
    Live each day like it is your last, for one day you will be right!

  11. #11
    Join Date
    Apr 2005
    Location
    Kingston Ontario Canada
    Posts
    1,210
    Originally posted by gha
    This particular unit is well known to me. Carrier has issued a bulletin recently for that TXV. 410 SHOULD NOT be topped up as it is a blended gas and depending on the leak will leak out at different rates causing a host of other problems in the future. The rate he charged to fix the TXV sounds pretty good. As for the tech that was unsure, there are some guys that just don't see heat pumps.The best way to charge it is by subcooling or superheat. Here in Canada we have to account for every ounce of R22 and 410 that we reclaim or use. So it gets weighed either way. In Canada you have to be a licensed HVAC technician with an ODP card to get your hands on 22 or 410, so reclaiming and filling with new 410 (if there was a leak) as a DIY project is not really an option.
    GHA: Would you mind making sure that this is the correct bulletin # from Carrier. I would love to discuss this with the dealer who worked on my heat pump. When I went over to pay him for replacing the TXV, I said to him that the heat pump worked fine until they came to do the general maintenance on it. Like I said in my post they washed the condenser and added a smidgen of 410A. Next time I turned on the heat pump it didn't work properly anymore. Also when I went to pay him he said that I should have got the extended warranty and it wouldn't have cost me a cent to fix the TXV. I said that I guess I should have, although, being a Carrier I thought I was getting the best, and being assured it would be installed properly, I didn't think I would have any problems for a long time.After all, I have owned three refridgerators in my life and never had any problems, and I have a 1989 Olds Touring sedan and the air conditioner has neve been touched.The heat pump is only 3 years old. What I think is going on is, the dealers anticipalte that most buyers will purchase the extended warranty and then they don't have to worry about a real good installation as Carrier will pay on the extended warranty for any problems down the road. Would a poor install have showed up before 3 years?
    GHA if you would like to email me, please do dkirkham2@cogeco.ca

    Thanks, Thorton

  12. #12
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Anything that is man made WILL break.

    The question is when?
    How tall are you Private???!!!!

  13. #13
    subcooling is used to check the charge on any expansion valve system. type of refrigerant has nothing to due with it. subcooling tells you how much refrigerant is in the system. if charge is low subcooling will be low if charge is high subcooling will be high.

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