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  1. Replies
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    The BD is now correctly oriented and functioning...

    The BD is now correctly oriented and functioning correctly. Setpoint is somewhat less than 0.2". It was partially open with only one zone calling in 1st or 2nd stage and fully closed with both zones...
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    The BD is supposed to be corrected soon, will...

    The BD is supposed to be corrected soon, will revisit the job next week and measure pressures, and will report observations on CRPD operation.
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    LOL. EWC had a problem with the gaskets...

    LOL.

    EWC had a problem with the gaskets detaching from their BD's and I found one where a piece of the gasket had jammed between the blade and the round housing rendering the BD useless.

    Do you...
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    Many thanks. True story: I once saw an SPRD...

    Many thanks.

    True story: I once saw an SPRD lying on an attic floor with flex duct in and out - it didn't work too well.
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    Honeywell CRPD Bypass Damper

    I have a job where the BD is installed with the arrow pointing to the supply main. I informed the customer, who contacted the installer asking him to correct the installation. The installer replied...
  6. Cheez! Why are you even considering 500...

    Cheez!

    Why are you even considering 500 SF/Ton???

    Kick these guys to the kerb and find someone else. Three tons would probably do it.
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    If you're not providing a pump, you won't need...

    If you're not providing a pump, you won't need the aquastat or time clock to control it. I didn't know a recirc would work without a pump, thanks for the tip.
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    Hello again! If you put in the recirc line,...

    Hello again!

    If you put in the recirc line, you'll need to insulate the HW and HWR (I'd go 1"). Provide an aquastat - and perhaps a time clock - to limit energy losses.

    Brass or SS circulator,...
  9. Go to naima.org and download "AH139" for...

    Go to naima.org and download "AH139" for "stretchout" dimensions. It's actually 8" for 2" wrap on rectangular ducts.
  10. OMG - "Summer-Winter" is archaic at today's fuel...

    OMG - "Summer-Winter" is archaic at today's fuel prices!

    Buy a water heater. Then reduce the boiler temperature as much as you can and still heat the home in cold weather (provide a T475 reset...
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    I've been enduring heat pumps since 1993, so my...

    I've been enduring heat pumps since 1993, so my hydronic experience is not recent.

    Rereading my 2142 post, I realized I used the RA832's for multiple circulators when I didn't know any better. I...
  12. Thread: XL18i vs XR17

    by ferd1942
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    I'm not surprised to hear 5/6 of the bidders...

    I'm not surprised to hear 5/6 of the bidders relied on their "experience" to size the replacement instead of performing the required cooling load calculation. Having said that, 750 SF/Ton is not out...
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    Agreed, but we're talking houses, not high rises....

    Agreed, but we're talking houses, not high rises.

    Did we meet at B&G's "Little Red School House" when I attended in the late 60's?

    Nice car, BTW!
  14. ??? A bigger system because of long duct runs ???...

    ??? A bigger system because of long duct runs ???

    Why don't you look for a contractor who knows something about duct design and cooling load?
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    You're at 600 SF/Ton, which should be good (even...

    You're at 600 SF/Ton, which should be good (even excessive) in a new home anywhere in the CONUS. Airflow from the "vents" (not sure if you have "floor diffusers", "wall registers" or "ceiling...
  16. Cheez! Why are you even considering 400...

    Cheez!

    Why are you even considering 400 SF/Ton???

    ACCA says "500...to more than 1,200" SF/Ton in Manual J, and that's with outdoor design as high as 110F (you didn't say where you live, so I...
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    Au Contraire: I spent 24 of my earlier years in a...

    Au Contraire: I spent 24 of my earlier years in a hydronically heated home (how I've missed the comfort, having lived with heat pumps since then), and learned any circulator is good enough, the lower...
  18. Thread: XL18i vs XR17

    by ferd1942
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    2,685

    Why are you even considering "High Efficiency"?...

    Why are you even considering "High Efficiency"? Do you live in the desert?

    Did your contractor explain about the increased repair costs when it breaks? Did he estimate the incremental savings vs....
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    You need to hire a contractor to install zone...

    You need to hire a contractor to install zone valves, remove all but one circulator and modify the controls accordingly. I always used Honeywell #RA832A1066 for each thermostat/valve, with the "X=X"...
  20. WOW! Rarely do I find systems that are high on...

    WOW! Rarely do I find systems that are high on airflow, let alone six in one place. Were they PSC's or ECM's?
  21. BBB: I'd rather balance the supply side: That...

    BBB: I'd rather balance the supply side: That will increase duct pressure and duct leakage between the furnace and damper(s); increasing inleakage on the return side increases the risk of circulating...
  22. There are things called "dampers", often...

    There are things called "dampers", often installed in branch ducts. The process of adjusting them to regulate flow is called "balancing".

    :<)
  23. You're running 450 CFM/Ton at 900 CFM. That...

    You're running 450 CFM/Ton at 900 CFM. That increases sensible and total cooling, and reduces latent. Why not balance to 400 CFM/Ton or less (don't go below 350)? That'll increase latent and promote...
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    I see a lot of older jobs with restricted duct...

    I see a lot of older jobs with restricted duct systems where the replacement contractor grew mold by providing the same size 16 SEER equipment: The new system delivered rated airflow for the first...
  25. Manuals J & RS require at least two zones in a...

    Manuals J & RS require at least two zones in a two story home. Additional zones are required for a room over a garage, sunroom, etc.

    Having said that, I'm able to control my single zone, two story...
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    Return location is not critical so long as the...

    Return location is not critical so long as the supplies are balanced. My "fix" is to provide a central floor grille at the first floor connected directly to the return plenum (where the air mover is...
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    Only measured SP at HP-01, operating at...

    Only measured SP at HP-01, operating at +0.08"/-0.04" and delivering 285 CFM vs. 550 CFM Design.

    Mains are sized at 900 FPM supply and 700 FPM return, so I'd be real surprised if that was an issue...
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    It should reduce the SP at the inlet, thereby...

    It should reduce the SP at the inlet, thereby increasing airflow. It's one of my favorite "fixes".
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    So they finally cleaned the blowers, coils and...

    So they finally cleaned the blowers, coils and blower compartments. Now I have two systems delivering about 15% less than rated flow (sum of outlets measured with Alnor LoFlo). Ducts are tight, and...
  30. That's a whole lot of outside air! 100 x [(79...

    That's a whole lot of outside air!

    100 x [(79 - 70)/(89 - 70)] = 47%
  31. It's quite refreshing to see people acknowledge...

    It's quite refreshing to see people acknowledge 500 SF/Ton is not cast in stone.

    I went from a 2-1/2 ton 10 SEER to a 2 ton 14.5 SEER in my townhouse, saved about 15% of KWH and noticed a big...
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    You're absolutely right. I see it on nearly every...

    You're absolutely right. I see it on nearly every job, to include those by one home builder who proudly boasts their homes exceed EPA's Indoor AirPlus program, and provide MERV 13 filtration while...
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    Thanks, people! Hard to see in the image, but...

    Thanks, people!

    Hard to see in the image, but the EZ Trap is installed without the trap. I guess it's now just an "EZ".
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    ECM vs. Drywall Dust

    365291

    I just looked at six geothermal heat pumps being used for temporary heating that've been circulating drywall dust for a few weeks now, wondering if I should be concerned about their ECM's....
  35. Thread: Flow Hood

    by ferd1942
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    T45: The Shortridge CFM-88L looks like what I...

    T45: The Shortridge CFM-88L looks like what I need, thanks. By any chance, do you know who sells it at the best price?
  36. Thread: Flow Hood

    by ferd1942
    Replies
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    958

    Flow Hood

    So I'm thinking about retiring my Alnor (analog) Balometer that's older than some of you reading this (I may have used it a couple of times a month over the 20-odd years I've had it). I need a 2x2 to...
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    Thanks catman! I just remembered I have two of...

    Thanks catman!

    I just remembered I have two of these, neither of which is controlling humidity as well as (I think) it should. The one I wrote about is controlling at 54% with a 50% setting, with...
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    Thanks catman! Talk me through this: Top right...

    Thanks catman!

    Talk me through this: Top right corner of screen? If I look at ISU 220 1st stage cool CPH is set "E" for auto discover, and there's a number displayed that tells me how many CPH the...
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    Mark: Thanks, I do have that document. There are...

    Mark: Thanks, I do have that document. There are more than 50 settings required - WOW!

    JBM: That was my first thought, it's good to hear it from someone who knows what he's about!

    Thanks for...
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    Auto Discover Mode - Honeywell Vision Pro

    I'm looking at a job with Amana two stage gas furnace and AC (AMVC/CHPF), find multiple ISU's (180, 220, 230, 240, 250, 348, 365, 372b & 500) are set "E" for Auto Discover. This is my "honeymoon"...
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    When I started out, I was taught to stratify heat...

    When I started out, I was taught to stratify heat in high ceiling areas, but you don't hear much about that today. Instead, there seems to be an emphasis on selling tons, and I hear a lot of concern...
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    You sliced it OB on that reply, need to retee:...

    You sliced it OB on that reply, need to retee: Are the ducts all flex?
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    Thanks garya! I can't answer, but I too would...

    Thanks garya!

    I can't answer, but I too would like to hear from those who can.

    I finally realized I didn't know it all 40 tears ago, now I eagerly anticipate Learning Experiences.
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    You didn't say the ducts are flex, but if they...

    You didn't say the ducts are flex, but if they are:
    14" flex @ 700 FPM = 740 CFM
    16" flex @ 700 FPM = 970 CFM

    Those numbers are for perfectly installed flex with compression 4% or less and NO...
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    I love Learning Opportunities! I thought CPH...

    I love Learning Opportunities!

    I thought CPH set the cycle length: 3 CPH = 20 minute cycles, 4 CPH = 15 minute cycles, etc. I also thought a cycle was the sum of on and off time, so a 5 minute run...
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    2,000 KWH/month is way too much for 1,000 SF,...

    2,000 KWH/month is way too much for 1,000 SF, even in Florida (it's probably too much anywhere on the planet). I'm thinking duct problems, possibly inleakage of attic air to the return duct. Ask the...
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    3,700 SF/ 9 Tons = 411 SF/Ton means you probably...

    3,700 SF/ 9 Tons = 411 SF/Ton means you probably have too much capacity. The only homes that require that much are those with inefficient duct systems, to paraphrase Manual J (it's a book, you know)....
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    Check the Digital Psychrometer Recommendation...

    Check the Digital Psychrometer Recommendation thread.
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    I've had the Fieldpiece PRH2 and the GE Psyclone...

    I've had the Fieldpiece PRH2 and the GE Psyclone for about three weeks and am pleased with both: Readings are quite consistent between the two and both appear to be well within their respective...
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    Thank you. "uneven airflow across the coil"...

    Thank you.

    "uneven airflow across the coil" prompts another question: Could it be pulling moisture off the coil and discharging it into the supply duct? I ask because there's what appears to be...
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