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  1. Replies
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    If 76k wont heat 3200sqft @ a 13f design temp...

    If 76k wont heat 3200sqft @ a 13f design temp then you need to find and fix the leaks in the house. 76k is a LOT of heat leakage, if you have MORE than that, then the large leaks should be easy to...
  2. Look at KWH and Therms, your use probably dropped...

    Look at KWH and Therms, your use probably dropped more than 10%. A lot of utilities have rate increases in the past year. What city is the house located? I would have used the extra $$ to split...
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    871

    What happens if the system can't keep up on those...

    What happens if the system can't keep up on those design days? The temp will slip a few degrees, thermal mass will normally prevent the house from getting too hot. Humidity will be low due to LONG...
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    977

    Double RPM is 8 times the HP. It's CUBED, not...

    Double RPM is 8 times the HP. It's CUBED, not squared.
    http://www.freecalc.com/fansfram.htm
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    977

    I doubt he'll even spend the $$$ on the motor...

    I doubt he'll even spend the $$$ on the motor unless the original doesn't provide enough CFM to stop the coil from freezing up.
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    977

    I'm sure it can be done, it will just be noisy...

    I'm sure it can be done, it will just be noisy and inefficient. Large blades moving at slower speeds tend to be more efficient than small blades turning at high speeds. But larger wheels cost more as...
  7. Where I'm CA are you? If heat isn't used very...

    Where I'm CA are you? If heat isn't used very much I question the need for a 70k furnace.
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    977

    Probably has a 10x7 or 10x8 wheel, getting...

    Probably has a 10x7 or 10x8 wheel, getting 1600cfm through it at a decent static pressure using any type of motor is gonna be fun... 1600cfm normally needs at least a 10x10 wheel.
  9. 4ton cool/70k heat is way overkill for a typical...

    4ton cool/70k heat is way overkill for a typical 1307sqft house. Unless your house is extremely leaky or in an extreme part of CA, it shouldn't need that large of a system.
  10. Replies
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    517

    70 degree DRY or HUMID air?

    70 degree DRY or HUMID air?
  11. Thread: DEC Star ECM

    by 54regcab
    Replies
    3
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    698

    Why no backward inclined blades? That's where the...

    Why no backward inclined blades? That's where the REAL savings are, forward curved blades are only about 65% mechanically efficient vs 85% for backward curved.
  12. Replies
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    977

    With a low enough static enough pressure the...

    With a low enough static enough pressure the larger motor running at 1075RPM may deliver the 1600CFM. Keep in mind that lower static = higher airflow, but requires more HP from the motor to keep the...
  13. Replies
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    751

    117f is an OCCASIONAL temp, what is design temp...

    117f is an OCCASIONAL temp, what is design temp for your area? Dropping for a 5ton down to a 4ton (20% reduction) will save you the same as a 2 point SEER increase (20% increase). Don't go too small...
  14. Replies
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    1,443

    A 100k furnace is a complete waste for Oklahoma. ...

    A 100k furnace is a complete waste for Oklahoma. If you can cool the house with a 5 ton AC, you can heat it with an 80k furnace.
  15. Replies
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    1,443

    60k furnace with outdoor temps below zero. Must...

    60k furnace with outdoor temps below zero. Must be either a small or tight house.

    Says a lot about how stupid a 100k furnace looks in a climate that doesn't even get below freezing. We have a...
  16. Replies
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    1,443

    You have to be less than 30% oversized on order...

    You have to be less than 30% oversized on order to have the ideal high/low switching during cold weather. This means a furnace that's about 1/2 the size typically installed. How many furnaces have...
  17. Replies
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    1,443

    Old thermostats had a 1 or 2 degree differential...

    Old thermostats had a 1 or 2 degree differential to kick in 2nd stage. Newer stats are normally timed and watch how quickly the temp rises with just stage 1 calling. If the difference is over 3...
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    688

    Looks like a simple amp clamp. Make sure the TED...

    Looks like a simple amp clamp. Make sure the TED knows it's hooked to a 240v source. AC units average about 1,000W per ton @ 95f outdoor temp. Newer units less, older units more. Cooler temps reduce...
  19. Replies
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    1,443

    Most 2 stage furnaces have low fire thats about...

    Most 2 stage furnaces have low fire thats about 70% of full capacity. Most furnaces are oversized by at least 30% so the 2nd stage never kicks in unless the system is recovering from setback. The...
  20. Replies
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    4,646

    Want reliability? Install BASIC models that don't...

    Want reliability? Install BASIC models that don't have ECM motors or fancy control boards. Correctly size them with proper airflow and heat exchangers/compressors will last a LONG time.

    I'm on...
  21. Replies
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    7,479

    Silly car manufacturers developing ideas to save...

    Silly car manufacturers developing ideas to save MPG when all they have to do is add a magnet to the fuel line. The amazon reviews are mind boggling, people actually believe it works...
  22. Replies
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    7,479

    You can buy some of those gas saver magnets that...

    You can buy some of those gas saver magnets that attach to your fuel line.... ...
  23. 2200/4.5 = 489sqft per ton. Agreed it looks like...

    2200/4.5 = 489sqft per ton. Agreed it looks like a "reverse engineered" load calc to hit 500sqft per ton.
  24. Replies
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    363

    Modulating furnace with PSC? I'm surprised they...

    Modulating furnace with PSC? I'm surprised they can get blower speed low enough when at minimum firing rate.
  25. udarrell I doubt his original system was...

    udarrell I doubt his original system was delivering 4 tons, much less 5. Most likely sized "500sqft per ton" but actually needs much less.
  26. Replies
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    7,479

    It's all good. Every time they bump the tread we...

    It's all good. Every time they bump the tread we call out the product...
  27. Replies
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    7,479

    Going from a 5 ton to a 4 ton will save 20% on...

    Going from a 5 ton to a 4 ton will save 20% on your bill. Most of the time you won't notice the smaller unit since it's rare to find a 5 ton system that actually delivers the full 2,000cfm. Most are...
  28. Replies
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    7,479

    Replacing the fan relay with a 20-110 sequencer...

    Replacing the fan relay with a 20-110 sequencer accomplishes the same thing.
  29. Replies
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    2,514

    There you have it. Out of the 3.5tons on your...

    There you have it. Out of the 3.5tons on your current system you may only be getting 70% or 2.5 delivered tons.

    My house is not super tight but I have fixed all the big leaks. Leaks are easier to...
  30. Replies
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    2,514

    And that's why the oversizing madness continues....

    And that's why the oversizing madness continues. With a correctly sized system no shortcuts allowed. It must operate at its rated capacity, not the 2/3's that's typically delivered. If your condenser...
  31. Replies
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    2,514

    Absolutely you can "precool" to get ahead. My old...

    Absolutely you can "precool" to get ahead. My old AC was a 3 ton, way oversized. Run the ceiling fans on high speed if need be. It amazes me how many crank the thermostat down and leave the fans on...
  32. Replies
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    2,514

    Wall insulation is standard 1999 construction,...

    Wall insulation is standard 1999 construction, 2x4 wall R11 or R13, not sure which. No tree cover at all, medium Grey shingles.

    Slip is how much the house falls behind Thermostat Setpoint. My AC...
  33. Replies
    96
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    2,514

    Plain 14 SEER AC with gas furnace. No VS motor.

    Plain 14 SEER AC with gas furnace. No VS motor.
  34. Replies
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    2,514

    Yup. 500sqft per ton reverse engineered into the...

    Yup. 500sqft per ton reverse engineered into the "Man J". Keep in mind my own 1600sqft house is 2 tons and good for 95/75 (20 degrees). "Slip" is not proportional to outdoor temp due to thermal mass....
  35. Replies
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    If you want even heating on both floors, then...

    If you want even heating on both floors, then install a small system on each floor instead of trying to do it all with 1 large system.
  36. I haven't either. All the MH parks around here...

    I haven't either. All the MH parks around here are electric resistance heat. Mobile homes out in the country use propane sometimes.
  37. Replies
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    Properly installed the 2.5 ton should be plenty...

    Properly installed the 2.5 ton should be plenty to keep you warm/cool. Should save some $$$ also with plenum repairs.
  38. Are you thinking improper LP conversion?

    Are you thinking improper LP conversion?
  39. AIRFLOW!!! AIRFLOW!!! AIRFLOW!!! How many...

    AIRFLOW!!! AIRFLOW!!! AIRFLOW!!!

    How many times do we have to tell you?
    You AREN’T GETTING THE REQUIRED 1500CFM through the furnace, that's why it's tripping limit. OVERSIZING or IMPROPER...
  40. Replies
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    2,514

    Yes that will work. It won't account for ductwork...

    Yes that will work. It won't account for ductwork losses.
  41. Replies
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    1,389

    Know your electric and NG rates before deciding.

    Know your electric and NG rates before deciding.
  42. Replies
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    2,514

    Buy a thermometer with a wire lead/sensor. They...

    Buy a thermometer with a wire lead/sensor. They aren't very expensive.
  43. Thread: CFM

    by 54regcab
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    913

    Must have been exceptionally Crappy ductwork.

    Must have been exceptionally Crappy ductwork.
  44. Replies
    96
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    2,514

    If the system falls too far behind it's too long....

    If the system falls too far behind it's too long. On 105f days my system will run 5 hours non-stop and loose about 3 degrees from setpoint (set @ 75, gets to 78). 78f feels great when it's 105f...
  45. Replies
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    330

    Happens all the time, especially with oversized...

    Happens all the time, especially with oversized (4+ burners in our area) systems. Carrier gas furnace give "33" and kills 24v, Goodman gives "4". We don't do oil in Oklahoma, but it wouldn't surprise...
  46. Thread: CFM

    by 54regcab
    Replies
    14
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    913

    On larger systems (over 3 tons) the ductwork...

    On larger systems (over 3 tons) the ductwork rarely delivers rated airflow. Most ductwork (especially returns) is too small.
  47. Replies
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    330

    I see it happen all the time. Homeowner never...

    I see it happen all the time. Homeowner never notices with mechanical or battery power thermostats.
  48. Why is expanded performance data a big secret...

    Why is expanded performance data a big secret that manufacturers normally keep "behind closed doors"? What is a homeowner going to do with it that would create a liability issue? Install/charging...
  49. Does the heat pump run constantly? Are you aware...

    Does the heat pump run constantly? Are you aware of how much AUX heat you are using? What is temp of the air from the registers when only the HP is running? How much does it increase when AUX kicks...
  50. Try installing commercial registers that can be...

    Try installing commercial registers that can be pointed at the floor. Low cost solution that may work well enough for you.
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