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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...
  10. Replies
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    1,576

    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...
  17. Replies
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    1,366

    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...
  18. Replies
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    658

    CNPVP4821ACAABAA

    CNPVP4821ACAABAA
  19. Replies
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    658

    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...
  26. Digital Psychrometer Supco DSP-1000 vs Testo 605-H2..my observations

    After purchasing both of these, here are my quick observations:

    Supco DSP-1000
    CON:
    - Display is smaller and harder to read
    - Short probe (not as suitable for sticking in duct work)
    PRO:
    -...
  27. Carrier Infinity - poor performance high stage

    Just an update on this, or lack of update. (Carrier Infinity supply air temp goes up from low to high stage, suction pressure goes up - good performance at low stage) Original thread:...
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    Still working good today - no complaints, but I...

    Still working good today - no complaints, but I bet it will be back. I just have to figure out how to present this to the HVAC contractor so that they believe me.

    I can comprehend "debris...
  29. Replies
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    Its still working fine this evening. I watched...

    Its still working fine this evening. I watched it shift from 1st to 2nd stage, supply air temp went down (opposite of what I usually experience). At the evap: Return Air Temp: 79, Supply Air...
  30. Replies
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    Yea - I was thinking about that. Bottom line,...

    Yea - I was thinking about that. Bottom line, the blower speed didn't "seem" to change, based on my unscientific observation of noise at the register (blows pretty hard at the particular one where I...
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    Dramatic shift in supply air temp

    OK, this goes along with my original Carrier Infinity thread (poor performance)
    http://hvac-talk.com/vbb/showthread.php?t=1113821

    The summary is, when it shifts to 2nd stage, supply air temp was...
  32. Probably 2 hours. Did the other usual things,...

    Probably 2 hours. Did the other usual things, cleaned the condenser coil (was already clean), the cursory spraying of cleaner on the upper surface of the evap coil, looked at the bottom side as best...
  33. He completed the "tune-up", but wants to come...

    He completed the "tune-up", but wants to come back Monday to take some airflow readings. He said the compressor is shifting to 2nd stage, but the suction pressure is increasing when it goes from 1st...
  34. Original installer is coming out today since I...

    Original installer is coming out today since I agreed to a year on the maintenance contract. As part of today's maintenance he agreed to check all those temps that the other guy checked Thursday. ...
  35. No, that was blower RPM CFM always reads...

    No, that was blower RPM
    CFM always reads 1400CFM, except when running 1st stage (can't remember that off the top of my head)
  36. Here are the three pics from the original thread:...

    Here are the three pics from the original thread:
    1. http://hvac-talk.com/vbb/attachment.php?attachmentid=248481&d=1330740981

    2....
  37. Yea, thats what he told me, and I see it here...

    Yea, thats what he told me, and I see it here (attached)
  38. I'll double check those line temperatures...

    I'll double check those line temperatures tomorrow afternoon after the outdoor ambient warms up. Yea, those were running temps (I've questioned that LL temp at the condenser for a long time)
    I...
  39. Yea, good catch, I typo'd that. RPM was 1036

    Yea, good catch, I typo'd that. RPM was 1036
  40. Today: Outdoor ambient: 91.5 Liquid line temp...

    Today:
    Outdoor ambient: 91.5
    Liquid line temp @ condenser: 92-93
    Liquid line temp @ evap (just before entering casing): 92

    Used my old k-type, which seems to be accurate when compared to the...
  41. Carrier Infinity 4 Ton - will I ever be happy

    (Subject should have been: "Carrier Infinity 4 Ton - will I ever be happy)

    Air Handler/Furnace: 58VA110-1-20
    Evaporator: CNPVP4821ACA

    7/8 Suction Line
    3/8 Liquid Line
    (these were previously...
  42. Carrier Infinity 4 Ton - will I ever be happy

    I've been complaining about my 4 ton Carrier Infinity (24ANA748 condenser, Infinity thermostat) for years. Basic complaint - its just doesn't seem as cold as the old Goodman R22 system that it...
  43. Thanks, I didn't realize that fixing a kink was a...

    Thanks, I didn't realize that fixing a kink was a possible option. I'll have them check it out.

    Your right, the kink does seem to be not too severe. I've known about it for a couple of years,...
  44. Kink in lineset - is this worth having fixed?

    Attached are a few photos of a kink that I discovered in my lineset where it enters the crawl space and curves up to head for the attic. I believe its a 7/8" line, 4 ton carrier (410a). I would...
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    Janitrol Collector Box Cover Crack

    I noticed that the collector box cover on my Janitrol GMPN060-3 furnace was cracked (see attached picture - vertical crack in the center). Should I be calling a tech in to have this cover replaced? ...
  46. R410a - Charge w/cylinder upside down or not?

    I've noticed that some guidance says that R410a cylinders have a dip tube, and they do not have to be turned upside down to allow liquid refrigerant to flow. But, I notice the techs turn the...
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    Cool down draft from return grille

    My air handler for 2nd floor is in the attic, Carrier gas furnace. Two return grilles 14X30 (ceiling) running through about 20 feet of 18" flex duct to bottom of air handler. The other is a 14X14...
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    OK, when they get back out here (I had to...

    OK, when they get back out here (I had to postpone today's visit), I'll make note of which wire he is checking.

    The air handler is a 58CVA with a Carrier N coil on top. There is talk of lowering...
  49. Replies
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    OK, one more question and I'll close the book on...

    OK, one more question and I'll close the book on this one.

    I think the consensus is that this thing is working as designed. The only things I can measure myself are supply/return air temps and...
  50. Replies
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    3,396

    Oh yea..I see now! I typo'd that, and didn't...

    Oh yea..I see now! I typo'd that, and didn't catch it. It ws 66.3.

    Funny thing about that big temp increase to probe 5. I noticed that earlier in the summer, so I had them remove the original...
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