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  1. Just wanted to post an update on this. Its been...

    Just wanted to post an update on this. Its been working great for a couple of months (since my last post at the end of July 2013).

    This is the first time in years, that it has worked properly...
  2. Bristol two stage reciprocating - Carrier Infinity

    I've posted many messages here over the years about this problem, and its been so strange I haven't been able to get it fixed. But I've confirmed that it is an intermittent problem.

    24ANA7...
  3. Carrier Infinity - A/C - Supply Air Temp goes up 2nd stage

    I've posted about this issue before, and unfortunately I still don't have it fixed.

    Carrier Infinity, 24ANA7, when running A/C, my supply air temp goes up 5-8F when it shifts from low to hi stage....
  4. Checking in for the new cooling season. This...

    Checking in for the new cooling season. This never got fixed (mediocre performance 2nd stage, supply air temp goes up about 5F from low to hi stage). Last season, TXV was replaced, 4" spacer...
  5. The latest on this - a new company (paid for by...

    The latest on this - a new company (paid for by Carrier) came out a couple of weeks ago, and measured CFM by measuring gas flow at the gas meter outside and return/supply air temps. They were...
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    Yea, its a Carrier Infinity, so I can see it...

    Yea, its a Carrier Infinity, so I can see it logged on the controller interface. Suction pressure is about 150psi when it trips, so its not even close to the set point of 50psi for low pressure...
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    Compressor pump down - high pressure trips

    R410a with TXV - After a 4" spacer was installed between my evaporator and furnace, the tech added a little 410a, but I suspect he overcharged. Subcooling is about 17F (nameplate calls for 15F, so...
  8. Nothing yet, but I'll have an update next Wed. ...

    Nothing yet, but I'll have an update next Wed. I'm working with the same Carrier rep, and have been able to communicate directly with him. But I decided to go with another HVAC contractor. I...
  9. King valve - does it require cooling when brazing

    Another observation when my evaporator was replaced. King valve at the condenser had no cooling when the filter dryer was brazed in, but he did do a good job of cooling the TXV. Whats the best...
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    Compressor pump down

    My Carrier Infinity has a 50psig low pressure cutout. When the tech did a pump down a couple of weeks ago, to replace my evaporator, I noticed that he didn't bypass the cutout, and I don't think he...
  11. OK, another update. 4" spacer installed between...

    OK, another update. 4" spacer installed between the air handler and the N coil evaporator. No difference. And unfortunately, they didn't bring a new compressor.

    I'm standing by for round 3.
  12. This is the Ask Our Pro's forum, and only Pro...

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and...
  13. First he looked at the furnace and coil, and had...

    First he looked at the furnace and coil, and had pretty much concluded that spacer was the problem, but he also talked about moving the txv sensing bulb outside the coil case.

    Went outside to...
  14. Another update, and hopefully we are moving in...

    Another update, and hopefully we are moving in the right direction. Finally got the Carrier service rep out here, and I was impressed - he definitely seemed to know his stuff.

    He said that I...
  15. Yea, I probably could have been a little more...

    Yea, I probably could have been a little more diligent about finding a company who does more thorough testing. Every time I complained, we attributed poor performance to flex duct temperature...
  16. OK, here is the latest on this issue. Based on...

    OK, here is the latest on this issue. Based on the info my local HVAC contractor passed to Carrier, Carrier concluded the TXV was bad. It was just in the 5 year parts warranty, so Carrier paid...
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    Carrier CNPVP Tin Coated vs Aluminum Evap

    I'm probably having my Carrier CNPVP evaporator replaced. Contractor says I can get the aluminum coil at the same price as the copper. Someone else mentioned the tin coated copper coil - I see...
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    CNPVP4821ACAABAA

    CNPVP4821ACAABAA
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    Replace evaporator instead of just TXV

    I'm getting an in-warranty replacement of the TXV in a Carrier CNPVP N coil which has been in use for 5 years.

    I'm not that concerned about the rusty evaporator (see attached pic) because I...
  20. The latest on this. My local HVAC company has...

    The latest on this. My local HVAC company has conferred with Carrier, and they believe the TXV is bad. Carrier had them come back out and double check the amp draw on the compressor, since these...
  21. Beginning to wonder that myself. I know this...

    Beginning to wonder that myself. I know this company has had some turnover lately, so I'm not sure how good their Carrier expertise is anymore (not a big company, so I know that must be a...
  22. I got similar numbers (about 26,000 btu/hr) for...

    I got similar numbers (about 26,000 btu/hr) for both. I'm using that Psychometrics app for iphone/android (maybe the same one your using), which also seems to match the regular enthalpy charts that...
  23. Interesting thought there - I knew that about the...

    Interesting thought there - I knew that about the Bristol/reverse direction compressor, but never thought about the mechanism that picks up the 2nd cylinder - being broken. I wonder if the amp draw...
  24. I think on the Infinity systems with Infinity...

    I think on the Infinity systems with Infinity controller, that 1400 is by design, and is not adjustable other than 350cfm/ton when set to efficiency, 400cfm/ton when set to maximum. (this is a 4 ton...
  25. Yea - long thread on that topic, and I guess that...

    Yea - long thread on that topic, and I guess that is what has prevented them from being able to quickly fix this. (and going to local Carrier for help). They've already noted that compressor amp...
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