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    Sweating Ductwork

    Hello,

    I live in New Orleans and my Supply Air Ducts sweat. The unit is in a vented attic. An HVAC contractor came out yesterday and[he said my metal duct 3" R8 insulation installation was poor....
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    I had a HVAC contractor out to look into my duct...

    I had a HVAC contractor out to look into my duct sweating problem and he said my metal duct 3" R8 insulation installation was poor. Insulation of was compressed, 1" in places ( need 2.25" installed...
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    I will also get a contractor to perform a...

    I will also get a contractor to perform a combustion analysis before and after the foam installation. That's a great idea I hadn't thought about.
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    Thanks guys for confirming there is no factory...

    Thanks guys for confirming there is no factory authorized method to implement this. I think my method is sound to accomplish the interlock, and in addition I will wire the call for heat and damper...
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    I understand that. It is an expensive...

    I understand that. It is an expensive alternative. That's what I meant by not an option.
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    Not an option. The attic was not foamed because...

    Not an option. The attic was not foamed because my HVAC contractor said the HVAC was fine without it.
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    I know how to read the wiring diagrams. What...

    I know how to read the wiring diagrams. What seems the only way to implement this interlock is to install a relay on the gas valve and use contacts on this relay to energize the damper and to put in...
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    It is a Carrier 58CVA110---1--20

    It is a Carrier 58CVA110---1--20
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    Unfortunately I have not found a HVAC...

    Unfortunately I have not found a HVAC contractor/professional in New Orleans who knows how to implement this interlock on a Carrier communicating Infinity System. And I agree a damper limit switch...
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    Could you elaborate. :putergreet:

    Could you elaborate. :putergreet:
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    Combustion Air Damper/Furnace Interlock

    Hello,

    I have a Carrier Infinity Variable Speed Induced Combustion Gas Furnace (58CVA) installed in my vented attic with Carrier Infinity 2 speed outside condensing unit, Infinity Zone Control...
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    OK all is well. Drilled another whole for my...

    OK all is well. Drilled another whole for my temperature probe (next to LAT) and read in mid 50's. The thermister is not reading the correct temperature.

    thanks again for the responses.
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    LAT 61; RAT 76, Rel Humidity 44%

    LAT 61; RAT 76, Rel Humidity 44%
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    Hi I'm back. Finally had 70+ degree day that...

    Hi I'm back. Finally had 70+ degree day that both contractor and I could be at house. He checked all the cfm's with flow hood, and adjusted dampers to get more air to study. He tried to check the...
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    Success

    Return Air Modifications were completed today, and my EST is now running .43 inWC at 1750 CFM. Was chilly today so contractor is going to return on a warmer day to check charge and air flows.
    ...
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    I had a ductblaster duct leakage test at...

    I had a ductblaster duct leakage test at Rough-In, 1.7CFM/100SqFt. I did not do a duct leakage test at trim-out, but had the painter caulk the ceiling registers to mitigate leakes between drywall...
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    Once the RA mods are made, the AC contractor...

    Once the RA mods are made, the AC contractor needs to commission the system. If we assume the RA mods reduce the static pressure to acceptlve values, could ya'll outline what the contractor should...
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    Each is 22 1/2" W x 18" H, stacked. The 1020 is...

    Each is 22 1/2" W x 18" H, stacked. The 1020 is the model no. for the larger of the 2 media filters carrier makes.

    http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/ezcb-3pd.pdf
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    Well, there will be 2 Media Filters Stacked. A...

    Well, there will be 2 Media Filters Stacked. A single filter at 2000CFM is rated .22 inWC drop, so with 2 in parallel, I figure .1 drop. Since each filter will take 1/2 the air flow, 1000CFM,...
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    New Return Air Design

    Attached is the design of the return air to remove the tortoruos path. It got the blessing of the local Carrier technical rep. Hope it works. Will be implementing in the next few weeks.

    thanks...
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    I will be correcting the RA undersizing and...

    I will be correcting the RA undersizing and mitigating the tortorous path:

    Increase RA grille. Question....I have the opportunity to install a Media Filter instead of a filter in the RA grille. ...
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    Yes, my guy is clueless. Thanks for all the...

    Yes, my guy is clueless. Thanks for all the input and hanging with me.
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    Great catch, have advised my AC contractor of...

    Great catch, have advised my AC contractor of this and he gave me some mumbo jumbo about calcs rs real world.

    The infinity system has the following setting selections for CFM (System is 5 Ton):...
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    Could you explain your comment that load calc...

    Could you explain your comment that load calc indicates the blower should be set lower than 2000CFM? Is it that the calc show 1579 CFM? Thanks, that would be an important system setting.
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    63 EWB is 75 DB at 50% Rh., 63 EWB is also what...

    63 EWB is 75 DB at 50% Rh., 63 EWB is also what is used in Manual S, ACCA spreadsheet. 95/75 25/72, These are all temperatures that seem to used for my area, New Orleans.
    AED, geeez had to google...
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    All zones need to be 75 anytime I want them to...

    All zones need to be 75 anytime I want them to be.

    No, I may be taking a nap while wife is working out.
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    Yes it is. And to put more salt in my wound, the...

    Yes it is. And to put more salt in my wound, the net cost difference would have been $ thousound up front cost, with real $ payback over time, and the intangible $ better HVAC operation, as I sat...
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    I thought the benefits of a zoned system for my...

    I thought the benefits of a zoned system for my house were:
    It allows capacity reduction by allowing setback in less occupied zone, even if not 100% of the time.
    It allows seperate temperature...
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    Sorry, not a full answer. One zone (Work Out...

    Sorry, not a full answer. One zone (Work Out Room) is not occupied as much as the other 2, and can be set back for more time in the day than the other 2. To put some numbers on it, that one zone...
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    But there are no unoccupied zones.

    But there are no unoccupied zones.
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    I understand a 4 ton system cost less than a 5...

    I understand a 4 ton system cost less than a 5 ton system. I just don't understand how the Manual J determines the load, than the Manual S is used to see what equipment can be selected to meet that...
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    Not sure how that is the case. But its taken me...

    Not sure how that is the case. But its taken me awhile to understand what the pros here have said. Thanks.
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    I would think the AC contractor has to guarantee...

    I would think the AC contractor has to guarantee the system will meet the design specs, for my case 75 deg indoor, 95 deg outdoor, for the whole house, which is what I specified. I didn't give the...
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    Ok now I understand the why a Manual S needs to...

    Ok now I understand the why a Manual S needs to be done, and the 80 deg comment if nominal/nameplate etc. are used.

    Ok so for my system I found the Carrier "Detailed Cooling Capacity" tables,

    @...
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    AC contractor has provided the below information...

    AC contractor has provided the below information over the phone.

    Manual J Calc: 39,794 Sensible, 9,574 Latent
    Performance for Equipment Selected: 41,000 Sensible 16,000 Latent
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    Load is based on Manual J, and I am trying to get...

    Load is based on Manual J, and I am trying to get the equipment performance specifications from the AC contractor for the equipment installed. Will report back when I receive the data.
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    ADP is a manufacturer, and I have carrier...

    ADP is a manufacturer, and I have carrier equipment, unless you are saying ADP makes coils for carrier. But all I'm hearing is without a Manual S I won't know the capacities my carrier equipment...
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    i've read alot of post on this site from the pros...

    i've read alot of post on this site from the pros and all they say is Manual J and Manual D. Geeeeez more homework to do:gah:
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    I'll let others weigh in on Man J not good...

    I'll let others weigh in on Man J not good without Man S comment, Maybe that deserves its own thread.
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    I have a 2 stage compressor (70% - 100%, scroll)....

    I have a 2 stage compressor (70% - 100%, scroll). Yes house is 2 stories and our discussion is on the 1st floor system. 2nd floor is a 1.5 ton. 1st floor has its own roof and does not communicate...
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    Load is based on Manual J. Don't know about...

    Load is based on Manual J. Don't know about Manual S.
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    My plan will not completely remove the tortorous...

    My plan will not completely remove the tortorous path, more like mitigate it. If you look at the picture looking up into the RA plenum you will see 2nd floor decking, and the offset to the attic...
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    Yes I am certain that the drywall was completely...

    Yes I am certain that the drywall was completely installed encasing the fireplace cavity, and it was mudded and taped, just not sanded or textured. There is a 4" fresh air duct to the outside soffit...
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    Ok, so the existing system must be set to 2000CFM...

    Ok, so the existing system must be set to 2000CFM (400CFM/Ton, 5 ton). CFM cannot be lowered to 1750 CFM (350CFM/Ton) since this causes Supply Air Ductwork Sweating (Ductwork installed in ventilated...
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    The fireplace framing is drywalled to seal its...

    The fireplace framing is drywalled to seal its cavity. Those are Engineered I Joists, and there is duct cut to fit and mastic'd to the wood I Beams. Its actually very well done to provide a sealed...
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    All SA are Ceiling registers. TruAire 3 way (...

    All SA are Ceiling registers. TruAire 3 way ( 103M) or 4 way (104M) ( <Links to direct purchase sites are not permitted>) installed a few feet from the outside walls. Register duct boots are inner...
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    Understandable about the heat, but what about the...

    Understandable about the heat, but what about the AC. If you do a manual J and you are confident in the numbers, Sq footage, R values, window sizes and E values, Do you use the manual J results, or...
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    Oversized system too???

    OK could an oversized system be an issue also.
    All 3 contractors said I needed a 5 ton based off the manual J calculation.
    I bought HVAC-Calc and ran the Manul J and it shows 4 tons. I am...
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    yes that is the offset, but its all the way up...

    yes that is the offset, but its all the way up the RA verticle chase. It goes up the chase 10' offsets thru the Wood I Beams (16" high) then enters the bottom opening of the RA duct plenum box,...
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    OK enough complaining, I need to solve this. The...

    OK enough complaining, I need to solve this. The OSB board you are seeing in the picture is my 2nd floor floor decking. The 2nd story RA is above it.

    If I raise the 2nd story RA, I could cut...
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