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  1. 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,...
  4. 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.
  5. 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...
  7. Thread: XL18i vs XR17

    by ferd1942
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    821

    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!
  9. ??? 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...
  11. 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...
  13. Thread: XL18i vs XR17

    by ferd1942
    Replies
    14
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    821

    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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    287

    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"...
  15. 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?
  16. 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...
  17. 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".

    :<)
  18. 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...
  20. 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...
  25. 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%
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