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  1. Replies
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    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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
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    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...
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    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...
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    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.
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    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...
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    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...
  11. 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...
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    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...
  13. 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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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"...
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    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...
  26. 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...
  27. 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...
  28. 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...
  29. 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...
  30. 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...
  31. 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)...
  32. 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...
  33. 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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    Arzel Evergreen

    Arzel has a zoning system called Evergreen Zoning in which they sell a replacement ECM supply fan motor and control its speed in conjunction with their damper system. It might be worth a look since...
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    I thank all of you for your advice and will...

    I thank all of you for your advice and will appreciate any further thoughts any of you have on our church's best choice in replacement rooftop units.

    We're now looking at Aaon's modulating...
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    We are in Columbia, South Carolina. The church...

    We are in Columbia, South Carolina. The church is Trenholm Road United Methodist Church. We would very much appreciate your advice. I am a mechanical engineer by degree but spent my career in the...
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    Thank you. Lennox is one I've been loooking at. ...

    Thank you. Lennox is one I've been loooking at. They have some new units with a 17 SEER rating (but only the 5 ton is that high as far as I can see and we need 10 ton units) but they aren't heat...
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    Bruce, Our church has almost the same problem...

    Bruce,

    Our church has almost the same problem you posed 2 years ago - choosing more efficient rooftop replacements. If you are willing to share what you found out - whether you found a company...
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    Who makes the most efficient rooftop units?

    Our church needs to replace two 23 year old 10 ton gaspacks on our gym and we would like to consider the most efficient options available since the gym runs more hours than any other area on our...
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    Need a lot more info than cubic feet. Like wall...

    Need a lot more info than cubic feet. Like wall and roof areas, R-factors, window areas and type glass, occupancy, outside and inside temperatures and humidity, required ventillation and temperature...
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    We don't have any willing to do all the design...

    We don't have any willing to do all the design work up to make such a proposal.
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    THANK YOU, Pneuma! This is exactly the type of...

    THANK YOU, Pneuma! This is exactly the type of advice I had hoped I would get on this forum. I understand that 30% or more of the energy can be lost in duct work (when in an unconditioned space...
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    Responding to MARAUDERX: I have suggested...

    Responding to MARAUDERX:

    I have suggested exactly that - engaging a consulting engineer who is independent and not associated with any particular contractor or manufacturer - (as recently as last...
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    Responding to JAYGUY: I fully agree and don't...

    Responding to JAYGUY:

    I fully agree and don't believe SEER really works in residential either. Especially not here in SC with our high humidity and relatively high temperature environment.
    ...
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    Sorry I have been away from the forum a few days...

    Sorry I have been away from the forum a few days and did not respond to "CHESEHD's" question as to where in SC I am and I wanted you to understand why I am reluctant to post that.

    Looking over my...
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