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  1. Replies
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    Steve, they drop to 65 on the inside. Outside,...

    Steve, they drop to 65 on the inside. Outside, it will be 20's or 30's. Not too bad, but not Hawaii.

    Teddkidd, my gas and electric cost average $100 a month total. According to Duke Energy's...
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    Thanks again, Teddkid, Beenthere, and Gravity. I...

    Thanks again, Teddkid, Beenthere, and Gravity. I will take some of all your advice, and the debate has been instructional.

    I will see if I can lower cfm, first, just to 1000 from 1033, and then...
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    [/COLOR] Thanks

    [/COLOR]

    Thanks
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    In this case and for my specific application, I...

    In this case and for my specific application, I agree with Gravity, even over Beenthere and Tedkidd, both of whom I respect very much and have learned a lot from.

    The reason is that I like to do a...
  5. No, I just use the 2 inch pleat. What is written...

    No, I just use the 2 inch pleat. What is written on it, is "Flanders 40 Prefilter". It was probably intended to be a part of a commercial system filter bank in front of bag filters. But it is just...
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    Thanks, I did not know I could do that. It...

    Thanks, I did not know I could do that. It sounds like good advice.

    I understand why locked into high fire would be economical, but why do I want to lower the cfms? Just wondering what the...
  7. I don't know if these filters have a merv rating....

    I don't know if these filters have a merv rating. I use a 2 inch pleated Flanders 40 prefilter. I figure two inches is going to be better than one inch pleats. It should not be too restrictive used...
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    Interpret my static air pressure numbers

    Today I ran a system check on my furnace for the first time, a Carrier 80% two stage (54k btu output on high and 36 k output on low, oversized I know, but about as small as I could get, and probably...
  9. I think I found the problem. My wife replaced...

    I think I found the problem. My wife replaced the filter two days ago, and because we use 2 inch pleats, it is a tight fit. So she installed it behind the filter box instead of in the filter box,...
  10. Carrier dual fuel performance series limit fault

    Two years ago I put in a carrier dual fuel system. Uses infinity thermostat. Has performed well.

    Yesterday my son noticed the thermostat said "system malfunction". When I pushed the button to get...
  11. Thanks everyone, for the great advice. I was...

    Thanks everyone, for the great advice. I was skeptical whether Mechanical Engineering consultants would have the sort of hands-on knowledge that I get from HVAC mechanics, but if you all are...
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    Thanks everyone, for the great advice. It...

    Thanks everyone, for the great advice.

    It looks like the size will be 275 tons. It is for a 100,000 sf building in Georgia. That is what is there now, and I thought about reducing the size a...
  13. Best place to get advice on replacement options

    When I have to make a big decision to make, spending $200 to $300k, what is the best kind of consultant to use? This site is great, and I greatly appreciate the opinions I get here, but occasionally...
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    Yes, I probably should have given that...

    Yes, I probably should have given that information.

    Between 250 and 300 tons.
  15. Replies
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    Replacement chiller

    I need to replace an old chiller. It is designed to be an indoor water-cooled chiller. I am curious if it matters whether it is centrifugal or screw type.

    What are the advantages and...
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    Thanks, that is a great explanation. I...

    Thanks, that is a great explanation. I appreciate you following up on my comment with this advice.
  17. Replies
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    Well, I understand that it is a 20 ton unit made...

    Well, I understand that it is a 20 ton unit made in 1993, anyway.

    I could not follow most of the rest of the posts.

    It is working well, and like I said, it is pretty quiet. It is getting old...
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    What kind of chiller is this?

    This chiller, it looks like it is an aircooled chiller.

    How does it compress the refrigerent? It does not make the typical chiller sound I am used to hearing, much quieter.

    How old is it, and...
  19. Two a/c units, can you tell me age and tonnage? Thanks

    Attached are two photos of labels with model number and serial numbers.

    Would anyone be so kind as to tell me the age and tonnage of these condensing units?

    I appreciate having this forum to...
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    Thank ya'll very much!

    Thank ya'll very much!
  21. Replies
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    What can you tell me about this Lennox unit

    Can anyone tell me the age and tonnage of the Lennox unit in the photo?

    Thanks298921
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    McQuay Unit how many tons

    Good afternoon everyone.

    Attached is a photo of a unit nameplate. Can anyone tell me how many tons of cooling this is? I am guessing it does not do any heating.

    Model #MPS050AE4DV1CYBV...
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    OP responding again

    Thanks all, for the lively debate and information on this question. Sounds like a number of opinions out there, and a number of variables to consider.

    In this building, the boiler actually can't...
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    Question on boilers in Summertime

    I am a Southerner and do not have a lot of experience with boilers and steam heat or hot water heat, but recently I went to inspect a building for general operating issues--not HVAC--up north in a...
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    Specking Rooftop York gaspak A/C

    At one building, we are replacing an old rooftop gaspack unit, 7.5 tons cooling, 90,000 btu heating.

    We are being quoted a York ZF090N10N2AAA5. They are replacing a York with a York, like for...
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    Thanks very much! I appreciate the help.

    Thanks very much! I appreciate the help.
  27. Replies
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    Yet another carrier model #

    Please help me with deciphering this unit's model and serial number.

    50TCQA05A2A5A0A0A0

    Serial # 2409G20292

    Is this a package unit or a split system? What year was it built?

    Is it 4 tons?
  28. Replies
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    Thanks for the responses. I checked lifetime...

    Thanks for the responses.

    I checked lifetime runtimes this morning and for A/C, it has run in low stage 1902 hours, and 274 hours in high stage. So 87% of the time has been low stage. I don't...
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    Results of downsizing from 3 to 2 tons

    Want to provide a data point, results of advice received here 2 years ago.

    A couple of years ago I first came to this site to learn what I should look for as I was replacing my old A/C that died....
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    thanks

    Thanks, everyone, for the help.
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    Carrier Rooftop Gaspack Model #s

    Hello, I have some Carrier rooftop gaspack AC units at an old building. Some look newer, some look older. Below are model #s and Serial numbers.

    48TJE004---511GA 4199G20460...
  32. Replies
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    How long will a cooling tower last?

    I just looked at a building my company owns in a warm humid climate. The building is 27 years old, uses water source heat pumps installed in the ceilings, that are fed from closed loops cooled by a...
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    Thanks everyone for the help. I know a whole lot...

    Thanks everyone for the help. I know a whole lot more now than I did before.

    I could not make out a serial number on the York.

    I may have gotten some of the numbers slightly wrong, so if...
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    Would anyone decode these model Numbers?

    Would anyone be so kind as to decode these model numbers for me?

    I mainly want to know how old they are, but will gladly take any other description offered.

    I assume all the Carriers are 4 ton...
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    Thanks for all the answers. I appreciate the...

    Thanks for all the answers. I appreciate the help.
  36. Replies
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    What SEER would an 18 year old unit be?

    I am trying to do a rough calculation of how much I would save replacing 18 year old heat pumps.

    A sample would be a 3.5 ton split system heat pump. A basic new one would be 13 SEER. What would...
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    Heating costs for comparison

    I canít post in reply to other posts, but would like to give some perspective to utility costs posted in other threads. I am shocked by what some people are paying.

    I am located in Charlotte, NC,...
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    insulation and air-sealing

    I am a big believer in air-sealing. I did not do a blower door test, just air-sealed up in the attic myself.

    Besides keeping the heat in, I have had two other benefits I did not expect.

    One, my...
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    A 190-ton in place of 2 70-ton chillers?

    Thanks as always for your great advice.

    I have a property where multiple air handlers are fed by three chillers, a 110 ton unit, and 2 70-ton units. The 110 ton is only about 2 years old. The...
  40. Thanks for the reply, I am glad to get...

    Thanks for the reply, I am glad to get confirmation from an independant source.

    Here is what I learned from Carrier when I asked them. Interestingly even from Carrier I got a slightly different...
  41. Are these Carrier compressors rebuildable?

    I have a 175 ton air cooled screw chiller by Carrier. It has two compressors. One company said the compressors were overdue for being rebuilt, and rebuilding them would reduce vibration.

    Another...
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    It is a 26,000 sf old school. But with very high...

    It is a 26,000 sf old school. But with very high ceilings, maybe 15 feet, so more volume than you would expect from the square footage, and a lot of windows.

    The building heats and cools pretty...
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    What can you tell me about this boiler?

    Attached is a photo of the name plate of a boiler in the basement of an old schoolhouse.

    How old is this boiler?

    I don't know much about radiator heat or boilers. Are water radiators still...
  44. Thanks for the replies. I realize that a 3 ton...

    Thanks for the replies. I realize that a 3 ton unit now puts out the same BTU's as a 3 ton unit then, at the rated temperature. I also expect to get higher efficiency, as long as I pay for it. ...
  45. Are newer heatpumps more effective at lower temperatures?

    I am looking at replacing some heatpumps at a small 7000 sf building ranging from 1993 to 1996. Location in West Virginia.

    I have heard that in general, newer units will put out more heat at lower...
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    OK, thanks very much. I certainly defer to your...

    OK, thanks very much. I certainly defer to your expertise, just wanted to make sure. The last time I asked about a unit, I got a variety of answers, but this time it appears everyone agrees how to...
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    Thanks for that reply, but I am a bit skeptical...

    Thanks for that reply, but I am a bit skeptical on the outside unit. The building was not built until 96. I would be surprised if a 1993 unit was installed outside, and the unit did not look that...
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    Dating units and insulation not supported

    Happy new year to all and thanks to all you who offer your help to amateurs like me.

    Attached are photos of two indoor units and one outdoor units nameplates.

    Can you tell me the age of them?
    ...
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    How old is this 2nd unit?

    I have this unit at another building. Can you tell me how old it is?

    Model #CHP16-413-7Y

    Serial #5698F-01257

    Thanks!
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    How old is this unit?

    Attached is a photo of the nameplate of a rooftop heatpump (I think).

    Can anyone tell me how old this unit is, how many tons, and what sort of backup heat it has?

    If you don't want to open the...
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