Search:

Type: Posts; User: nexsen

Page 1 of 2 1 2

Search: Search took 0.01 seconds.

  1. I may have partially answered my own question...

    I may have partially answered my own question about the DZK not having a 3 foot straight duct section before dampers: I watched a video on UTube and see that the FXMQ fan coil has its fan between...
  2. Daikin FXMQ48PVJU question (and DZK question)

    Can anyone tell me if the Daikin FXMQ_PVJU DC powered fan coils operate at infinitely variable speeds or 3 fixed speeds?

    The specs show 3 speeds: 1377 / 1165 / 988 cfm for the 4 ton model but...
  3. Replies
    20
    Views
    9,989

    pecmsg: If you think it is relevant perhaps...

    pecmsg:

    If you think it is relevant perhaps you can delete my post and re-post this to this old thread (I'm not a professional member but this information may be of use to members):

    I...
  4. Ok, we'll leave it at that. Thanks

    Ok, we'll leave it at that. Thanks
  5. I think it was 22 degrees here today so it will...

    I think it was 22 degrees here today so it will be awhile before I get a chance to do that.

    One last try at convincing you: When you suddenly un-cap the pressurized 200 foot hose in your example...
  6. If you have actually done this and gotten a...

    If you have actually done this and gotten a different reading there are two possibilities:
    1. There was some leakage so therefore "flow" causing a pressure drop, or
    2. You used a different pressure...
  7. If there was no flow it actually will read the...

    If there was no flow it actually will read the same pressure at the faucet and at the end of the long hose. Not while it's flowing but once the capped hose is filled and flow stops the pressure will...
  8. Right, I think the very long tubes are masking...

    Right, I think the very long tubes are masking the pulsating pressure reducing it to a very tiny vibration of the gauge needles. Of course if this were a case of truly "static" pressure (as it...
  9. Exactly! But I have seen my system running the...

    Exactly!

    But I have seen my system running the compressor at 100% with all but one zone satisfied and that one within one degree of its set point. But I blame that on "misinformation" the system...
  10. It's actually not a communication problem. There...

    It's actually not a communication problem. There is no feedback signal they can look at to determine if a damper is open or not. It is an "open loop" control. The system applies 24 vac to the...
  11. Thanks for your reply. I will definitely...

    Thanks for your reply. I will definitely consider the Trane. Incidentally my duct system met the Carrier guidelines when the system was installed and has been enlarged "several" times and each time...
  12. Can you recommend the next best variable speed condenser based zoning system?

    I will soon be replacing Carrier 5 ton and 3 ton Infinity Greenspeed systems with 4 zones each which I still think is probably the best zoning system made "when it works" but my 5 ton hasn't for 3...
  13. Replies
    0
    Views
    289

    Question for a Daikin expert!

    We had a Daikin 4 ton condenser with 4 ducted air handlers totalling 5 tons installed on my daughter's house of about 2500 square feet. It's well insulated with foam in walls and roof.

    It seemed...
  14. Contact with owners of the same system

    Thank you for your suggestion. I will try creating a new thread and summarize all that's been done trying to solve this problem over the past two years but it still won't solve the problem I was...
  15. A question and suggestion for the moderators:

    First let me remind you I started this thread (since I've had posts deleted in the past even in threads I started).

    This is an OLD thread I started "before" buying two Carrier Infinity Greenspeed...
  16. There isn't any visibly noticeable change when...

    There isn't any visibly noticeable change when the damper actuators have been damaged by the system. They just stop opening when the system applies 24 volts and when they are replaced the dampers...
  17. Unfortunately no. Carrier for nearly two years...

    Unfortunately no. Carrier for nearly two years has insisted it is caused by high static pressure and they have demanded duct size increases but every increase has made the problem worse.

    What I...
  18. Replies
    25
    Views
    12,651

    I appreciate your input but I would apprecaite...

    I appreciate your input but I would apprecaite even more an explanation.

    How can you conclude the duct system is too small if it only develps a total static pressure (measured from supply to...
  19. Replies
    14
    Views
    2,885

    Brent, Tahnks for those thoughts but this...

    Brent,

    Tahnks for those thoughts but this problem has been happenning since these systems were installed in the summer two years ago. The problems in cooling are the same - dampers aren't open...
  20. Replies
    14
    Views
    2,885

    I meant we've been through 4 sets of damper...

    I meant we've been through 4 sets of damper "actuators".. Thay are Carrier actuators. But most actual dampers have been replaced to at one time or another.
  21. Replies
    14
    Views
    2,885

    Brent, Thanks. It's a 5 ton condenser with a...

    Brent,

    Thanks. It's a 5 ton condenser with a 5 ton air handler. Upstairs we have a 3 ton condenser with the same 5 ton AHU so are you saying that could be a problem on the 3 ton system? My 3...
  22. Replies
    14
    Views
    2,885

    I do appreciate the comments and wanted to let...

    I do appreciate the comments and wanted to let everyone know the wiring was replaced and the problem persists.

    I now know it is NOT a firmware problem either. I watched a zone open and...
  23. We are still trying to determine what is causing...

    We are still trying to determine what is causing the dampers to fail to open or re-close and my contractor (who is great) has done everything humanly possible including:

    Everything in the system...
  24. Replies
    25
    Views
    12,651

    Update on Infinity Greenspeed dampers failing problem

    We are still trying to determine what is causing the dampers to fail to open or re-close and my contractor (who is great) has done everything humanly possible including:

    Everything in the system...
  25. Has anyone seen Carrier Infinity dampers close immediately after opening?

    I've had a problem with my 5 ton Infinity Greenspeed system that we "thought" was due to dampers failing to open becaue of high static pressure but I recently observed one opening and then...
  26. Replies
    14
    Views
    2,885

    Just a quick update: The only cables that were...

    Just a quick update: The only cables that were not alrready shielded have been replaced with shielded cables and it did not cure the problem.

    In addition the 5 ton system experienced a problem...
  27. Replies
    14
    Views
    2,885

    Thank you very much for your response and I...

    Thank you very much for your response and I definitely agree the cabling from control board to dampers should be a suspected source of this problem.

    I did ask them to check the cabling and I have...
  28. Replies
    14
    Views
    2,885

    Thanks for the responses. I "assume" they are...

    Thanks for the responses.

    I "assume" they are Carrier (or Bryant) dampers.

    Bur Carrier tells me the zone damper positioning commands sent via their protocol from the controller to the zone...
  29. Replies
    14
    Views
    2,885

    Carrier Infinity Greenspeed Zoining Problem

    If anyone can advise on this complex problem I would greatly appreciate your input.

    We had two 25VNA systems installed about 8 months ago. A 5 ton with 5 zones and a 3 ton with 4 zones.

    We have...
  30. Replies
    25
    Views
    12,651

    Carrier Greenspeed problem update

    Update on my Infinity Greenspeed system problems:

    We discovered zone dampers are failing to open many times per day. Sometimes the system will show Zone 1 and 2 at position 15 (wide open) and...
  31. Replies
    7
    Views
    1,128

    Thanks Bob. I had hoped you had an Infinity...

    Thanks Bob. I had hoped you had an Infinity Greenspeed with zoning system like mine and we could compare the system event logs. This system uses proportional dampers like the old Parker system...
  32. Replies
    7
    Views
    1,128

    This is offtopic for this thread but I could not...

    This is offtopic for this thread but I could not figure out how to contact HotRodRob another way so please forgive me for posting off topic. I will start a new thred for this but would greatly...
  33. Replies
    25
    Views
    12,651

    Thank you. I have emailed Carrier and my...

    Thank you. I have emailed Carrier and my installer about the model plug. Maybe they overlooked that but the blanks in those fileds was included in my first report of this problem 2 weeks ago when I...
  34. Replies
    25
    Views
    12,651

    Thank you for making it a separate post. Sorry I...

    Thank you for making it a separate post. Sorry I did not understand. The company who installed the system is great and is coming tomorrow to take static pressure meausrements from the ducts to...
  35. Replies
    25
    Views
    12,651

    Sorry, I did not see your question until after I...

    Sorry, I did not see your question until after I made the follow-up post. Both the 3 ton and 5 ton have the same AHU - FE4ANB006T00 except the 5 ton was a slightly different model from 2 years ago...
  36. Replies
    25
    Views
    12,651

    More on the Carrier Greenspeed Problems

    Here's an observation on our 3 ton 25VNA system supporting my concerns that the control algorithms are seriously flawed:

    This is the system that has had 254 "Zone I airflow limited stage downs"...
  37. Replies
    25
    Views
    12,651

    Carrier Greenspeed/Infinity problems

    This reply is to ask ISUREDO for his insight into my problems with two new Carrier 25VNA systems with variable speed compressors.

    The 5 ton unit is experiencing excessive 161 code (Excess Static...
  38. The current issue (actually last week's) of "The...

    The current issue (actually last week's) of "The News" (www.achrnew.com) had an article confirming Carrier uses the Copeland Variable Speed compressor in this product. I am anxiously awaiting pricing...
  39. I think "all" the old school knowledge is...

    I think "all" the old school knowledge is definitely needed to understand and service these new variable refrigerant flow systems. Just think of them as what you already know so well - but capable...
  40. Thanks for all the advice. Since this is a...

    Thanks for all the advice. Since this is a rooftop I guess line length shouldn't matter so the consensus seems to be that it should work (as long as it is installed right).

    One thing I wanted to...
  41. Thanks. So you don't see any inherent problem...

    Thanks. So you don't see any inherent problem with such a replacement?

    We have gotten a price from a trusted HVAC company but they called back today and told us they had spoken with Carrier and...
  42. Replacing reciprocating compressors with scroll?

    Our church has some 25 year old RTU's that will be replaced after our next capital campaign but one 6 ton compresor in a 12 ton Carrier 48DP serving our dining room just failed. The Carrier...
  43. Thanks Bartdude, Here in SC I would never need...

    Thanks Bartdude,

    Here in SC I would never need heat strips. Our Brayden demand limiting system has them off during peak hours anyway and we've survived OK. (not noticing cold air when in defrost)...
  44. I am in Columbia, SC - close to 50/50 cooling and...

    I am in Columbia, SC - close to 50/50 cooling and heating but maybe a little more cooling. Normal rates here are about 12-13 cents per KWH but I have a demand limiting system and get a rate of about...
  45. Does anyone have information on the new Carrier Variable Speed Compressor Condensers

    Carrier has announced a new series of variable speed compressor based Infinity systems called the Infinity 20 HP with Greenspeed Intelligence. All I have found is at AHRI (search for Infinity HP...
  46. Replies
    81
    Views
    23,326

    Why is a SCW not viable for a home?

    fsq4cw: Why is a standing column well not a viable option for a home? Is that just in your area where bedrock may be too deep or a general statement that would apply everywhere?

    I am actually...
  47. Replies
    20
    Views
    9,989

    I've always felt a water to water system would be...

    I've always felt a water to water system would be more efficient - and theoretically it "should be" - but as I look at the efficiency (EER) of most water to water units none that I have found...
  48. Replies
    20
    Views
    9,989

    Water sourced mini-splits

    I have not found any water sourced mini-splits but the commercial versions of mini-splits labeled VRF or VRV (for variable refrigerant flow or volume) offer water sourced condensers. Look at the...
  49. Replies
    81
    Views
    23,326

    Justifying GEO

    Even with the 30% tax credit you don't see a payback from a geothermal system with EER's approaching 30?

    I think it depends largely on how large the power bill is. The larger it is the easier it...
  50. Replies
    49
    Views
    6,948

    Aaon condenser fan question

    TechO7,

    Were all those condenser fan failures on VCC compressor units with the fan "cycling" option?

    Aaon offers a very low cost fan cycling option that will turn the condenser fan off and on...
Results 1 to 50 of 72
Page 1 of 2 1 2

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event