Search:

Type: Posts; User: amd

Page 1 of 20 1 2 3 4

Search: Search took 0.05 seconds.

  1. Why two mid efficiency furnaces? Was the capacity...

    Why two mid efficiency furnaces? Was the capacity actually needed?

    Why not install one large 95%+ 2 stage and zone the supply ducts? Better efficiency, probably similar cost.
  2. Replies
    0
    Views
    138

    HVAC calc duct sizing questions.

    I've been playing with the hvac-calc trial.

    It's capable of generating room by room cfm reports; however, there doesn't seem to be control over heating cfm relative to cooling cfm.

    The program...
  3. Replies
    14
    Views
    2,591

    ^The road to hell i paved with good intentions. ...

    ^The road to hell i paved with good intentions.

    Maybe they should focus on other things for gw like the actual burning of oil and gas.

    If a r22 machine isn't leaking, it's best to just keep it...
  4. Replies
    53
    Views
    1,792

    When coils have nominal tonnage ratings, it's for...

    When coils have nominal tonnage ratings, it's for 13 seer matches to my knowledge. Get a 14-15 seer and the indoor nominal tonnage could be 1/2 to a full ton above the condenser.

    Get 16-18+ seer...
  5. Replies
    53
    Views
    1,792

    i don't think ac systems have to engineered if...

    i don't think ac systems have to engineered if there's an existing duct system, just properly sized and commissioned.

    350-500 cfm per ton depending on the application, then proper charge?
  6. Replies
    24
    Views
    2,554

    Nice until the repair costs come. What would...

    Nice until the repair costs come.

    What would one of those controller boards cost?
  7. Replies
    14
    Views
    2,591

    Are you saying you can't run existing r22...

    Are you saying you can't run existing r22 equipment in sweden? If yes, that's pretty messed up, especially with having to change out working machines. Manufacturing new stuff destroys the earth too.
  8. Replies
    0
    Views
    222

    john michael greer - false promises

    https://www.youtube.com/watch?v=hkwjTa3Wdn4
  9. Replies
    9
    Views
    482

    Don't even think about it! Attic systems are...

    Don't even think about it! Attic systems are inefficient as hell for obvious reasons.

    Mini-splits were invented for a reason.
  10. Replies
    7
    Views
    371

    Goodman gsx13 and 14 compressors

    qiuck and simple question out of curiosity:

    goodman used to advertize thier 13-14 seer models as coming copeland scrolls exlusively.

    now online it just says "energy efficient compressor."
    ...
  11. Replies
    6
    Views
    568

    The north american consumer...

    Behold:
  12. Replies
    37
    Views
    1,932

    I forgot to mention that it's a tad bit...

    I forgot to mention that it's a tad bit underfired according to the gas meter, so the house is heating at design with maybe 34-35k. Small house, insulated but not well (nothing in the basement) and...
  13. Replies
    37
    Views
    1,932

    Two-stage stat still helps even when oversized. ...

    Two-stage stat still helps even when oversized.

    Where i am:

    60k btu furnace, 39k on low.

    Runs 8-12 minutes at a time in typical winter weather below freezing, 40-60 minutes below -20c/-4f.
    ...
  14. Replies
    37
    Views
    1,932

    I've seen it happen, but only in extreme cold....

    I've seen it happen, but only in extreme cold. (below design)

    Plus, i've seen operation on low fire for much longer than the short time delay.

    Bad contractors have no business installing high...
  15. Replies
    37
    Views
    1,932

    Most furnaces are oversized and low fire is...

    Most furnaces are oversized and low fire is sufficient.

    Two stage furnace with a two-stage stat can run for hours on low, shifting to high and back down as needed.

    Two-stage is for comfort, not...
  16. Replies
    3
    Views
    667

    No one has access to this info?

    No one has access to this info?
  17. Replies
    3
    Views
    667

    Old keeprite units information, pre-1994

    This question is just out of curiosity since i've seen a lot of these units still in use:

    Does anyone have info (like seer ratings, literature, when they went into production or anything else) on...
  18. Replies
    1
    Views
    1,145

    hvac charlges - nsfw, bad langauge

    https://www.youtube.com/watch?v=V8JvRKq_mc4
  19. Thread: A/C Leak Sealants

    by amd
    Replies
    14
    Views
    2,366

    Don't the newer sealants (like this -...

    Don't the newer sealants (like this - http://www.cliplight.com/hvacr/chemical-tools/super-seal-total/) have some moisture neutralizing chemical in them.
  20. Replies
    10
    Views
    1,317

    You need to damper off the vents that are getting...

    You need to damper off the vents that are getting a lot of airflow.

    Be careful though - closing too many vents can cause problems with the equipment.
  21. Replies
    10
    Views
    1,317

    You can put two thermostats in parallel on one...

    You can put two thermostats in parallel on one system, but I don't recommend it:

    You need to balance the system - partially close off the vents in the kids rooms.

    You could also try a...
  22. ..................................delete this...

    ..................................delete this post.
  23. While we're on the topic of old units does anyone...

    While we're on the topic of old units does anyone have any info or literature (spec sheets, seer ratings, service manuals) on the older keeprite condensers? Before keeprite of bought out and really...
  24. Were there two different refrigeration circuits...

    Were there two different refrigeration circuits or was it just like a stage?
  25. ...

    ...
  26. Old heatpumps in ontario canada and other cold climates

    I came across these ads in an old ottawa newspaper:

    556361

    It seemed like carrier (...and maybe other manufacturers) was really pushing heatpumps in the late 70s and early 80s here. Must have...
  27. Replies
    12
    Views
    1,106

    Check the pilot orifice - maybe its plugged

    Check the pilot orifice - maybe its plugged
  28. Replies
    12
    Views
    3,236

    120k input, 95% is HUGE for 3500 sq ft house...

    120k input, 95% is HUGE for 3500 sq ft house unless it's leaky as hell and/or the exterior walls have no insulation. Could be one or two sizes too large.
  29. Thread: Rooftop unit coils

    by amd
    Replies
    5
    Views
    800

    Thanks

    Thanks
  30. Thread: Rooftop unit coils

    by amd
    Replies
    5
    Views
    800

    Is it possible to adapt a commercial opening...

    Is it possible to adapt a commercial opening (existing is a 20+ year old york sunline) to a residential cabinet?

    Can you get an economizer and stainless steel heat exchanger in a residential...
  31. Thread: Rooftop unit coils

    by amd
    Replies
    5
    Views
    800

    Rooftop unit coils

    Does anyone still make a 3-5 ton rooftop without micro channel coils?

    Everything I've seen listed is microchannel.
  32. The purpose of ventilation is to purge the...

    The purpose of ventilation is to purge the moisture and heat from the attic that leaks in from the house. (excess moisture condenses on cold surfaces and heat melts the snow and causes ice dams)
    ...
  33. Replies
    7
    Views
    857

    I'll believe it when I see it.

    I'll believe it when I see it.
  34. Personally I would let it run and let the aux...

    Personally I would let it run and let the aux heat cycle automatically. Resistance heat will always cost you more than the heatpump.

    You can get a t-stat that brings on the resistance heat as soon...
  35. Thread: SAW DUST!!!

    by amd
    Replies
    5
    Views
    703

    He should get a good dust collection system if...

    He should get a good dust collection system if there isn't one and look into a standalone air cleaner to get the dust down to begin with.

    Washables generally aren't good enough to take out fine...
  36. Replies
    56
    Views
    8,425

    Well, it drains, doesn't it?

    Well, it drains, doesn't it?
  37. Replies
    91
    Views
    9,669

    ^Without the subsidies they wouldn't be doing it.

    ^Without the subsidies they wouldn't be doing it.
  38. Hint 1: If you're using an exhaust fan for...

    Hint 1:

    If you're using an exhaust fan for cooling, humidity isn't a factor, so disregard the latent part of the manual j.

    Hint 2:

    What are your design temperatures?

    The lower the delta-t...
  39. Replies
    91
    Views
    9,669

    If alternative energy was viable, you would think...

    If alternative energy was viable, you would think that fossil fuel suppliers would get into the business. They could buy up, put install solar arrays, and sell the energy at a huge profit.
  40. Replies
    91
    Views
    9,669

    Solar is a pain in the neck for utilities because...

    Solar is a pain in the neck for utilities because there's no way to control the output - you can't depend on the power when you need it, but you've gotta buy it when it's produced under contract.
    ...
  41. Replies
    1
    Views
    311

    Basic things to know about two stage furnaces: ...

    Basic things to know about two stage furnaces:

    1. They have the ability to run at 60-70% capacity. The gas valve in two stage furnaces supplies gas to the burners at a lower pressure on low.

    2....
  42. Replies
    20
    Views
    1,937

    ^I'm no fan of ul actually -> selling an alarm...

    ^I'm no fan of ul actually -> selling an alarm which only goes off at 70ppm is crazy, but at least the better models display lower levels, right?

    I know that they've done similar things with smoke...
  43. Replies
    20
    Views
    1,937

    The cheapest kidde alarm on the market has an...

    The cheapest kidde alarm on the market has an electrochemical sensor: http://www.kiddecanada.com/utcfs/Templates/Pages/Template-53/0,8062,pageId%3D2725%26siteId%3D463,00.html

    Care to explain?
  44. Replies
    36
    Views
    10,737

    ^I don't think pressure has anything to do with...

    ^I don't think pressure has anything to do with it though - condensers run at much greater pressure than evaps do, yet leaks are rare, right?
  45. Replies
    5
    Views
    814

    Man, why does vb4 suck so much? The search in vb3...

    Man, why does vb4 suck so much? The search in vb3 worked great.
  46. Replies
    5
    Views
    814

    Google only finds things on the open forums...

    Google only finds things on the open forums anyhow. My things have been moved around.
  47. Replies
    5
    Views
    814

    Searching this board using google.

    Hi,

    I've found that ever since the software upgrade, the internal search doesn't always pick up all the threads it should and list them in the right order.

    Somethings I use google instead - ie...
  48. You can calculate heating BTUs more easily on the...

    You can calculate heating BTUs more easily on the water side; mass flow rate and temp differential required.

    I think accurately measuring cfm is tricky.
  49. Thread: Insulating 90's

    by amd
    Replies
    12
    Views
    1,344

    Keep the ductwork out of the damn attic - then...

    Keep the ductwork out of the damn attic - then you won't have to insulate 90s. :p

    Such installs should be illegal.
  50. Replies
    12
    Views
    1,990

    Try Hot2000 - simulates energy performance but...

    Try Hot2000 - simulates energy performance but also calculates load.

    Not a professional opinion:

    I can see a new, tight 2400 sq ft house built with r-20 walls only needing 42 000 btu/hr of...
Results 1 to 50 of 1000
Page 1 of 20 1 2 3 4

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.
Quality Home Comfort Awards