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  1. Replies
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    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.
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    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...
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    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...
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    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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    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...
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    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...
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    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...
  8. Replies
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    6,845

    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...
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    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.... ...
  10. 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.
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    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.
  12. 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.
  13. Replies
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    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...
  14. Replies
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    6,845

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

    Replacing the fan relay with a 20-110 sequencer accomplishes the same thing.
  16. Replies
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    2,136

    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...
  17. Replies
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    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...
  18. Replies
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    2,136

    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...
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    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...
  20. Replies
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    2,136

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

    Plain 14 SEER AC with gas furnace. No VS motor.
  21. Replies
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    2,136

    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....
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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.
  23. 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.
  24. 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.
  25. Are you thinking improper LP conversion?

    Are you thinking improper LP conversion?
  26. 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...
  27. Replies
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    Yes that will work. It won't account for ductwork...

    Yes that will work. It won't account for ductwork losses.
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    Know your electric and NG rates before deciding.

    Know your electric and NG rates before deciding.
  29. Replies
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    Buy a thermometer with a wire lead/sensor. They...

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

    by 54regcab
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    Must have been exceptionally Crappy ductwork.

    Must have been exceptionally Crappy ductwork.
  31. Replies
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    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...
  32. Replies
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    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...
  33. Thread: CFM

    by 54regcab
    Replies
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    806

    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.
  34. Replies
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    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.
  35. 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...
  36. 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...
  37. 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.
  38. Being 10% short on rated capacity isn't your...

    Being 10% short on rated capacity isn't your issue. I doubt the system is even delivering the full rated 3.5tons.
  39. Replies
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    Have the house tested and fixed/air sealed if you...

    Have the house tested and fixed/air sealed if you want to see real savings on your utility bills. ManJ is a calculated guess if you don't have the actual ACH number.
  40. Replies
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    That's what happens when you actually deliver the...

    That's what happens when you actually deliver the rated capacity....
  41. Replies
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    What do you consider a conservative setting? Was...

    What do you consider a conservative setting? Was that factored into the calculation? Conservative (77f or higher) settings tend to make the AC not run enough to remove humidity. 75f is ASHRAE...
  42. Replies
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    You're really close to the 500sqft "rule of...

    You're really close to the 500sqft "rule of thumb", 3 tons should be more than enough. A tight house should be closer to 750sqft per ton if ManJ is done accurately.
  43. Replies
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    Gas is cheap, delivery fees continue to rise....

    Gas is cheap, delivery fees continue to rise. Delivery fees cost more than the gas does !!
  44. I'm thinking the system isn't operating at...

    I'm thinking the system isn't operating at capacity or the insulation contractor missed something big.
  45. At what point do you go up to the next size? If...

    At what point do you go up to the next size? If net output of the 1.5 ton system is 1.3 tons do you go up a size? Will being 0.13 tons short make that much of a difference? How much of the shortage...
  46. If load calculations call for 1.43 ton a 1.5 ton...

    If load calculations call for 1.43 ton a 1.5 ton single stage should be perfect.
  47. Replies
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    What default temps for summer/winter did...

    What default temps for summer/winter did www.loadcalc.net use?
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    How much does running your current fan help with...

    How much does running your current fan help with circulation?
  49. Replies
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    In most cases it will work, but leaves a lot of...

    In most cases it will work, but leaves a lot of comfort and energy savings on the table when compared to a proper ManJ calculation.
  50. Replies
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    50 degree split is 20f @ 70f indoors. How often...

    50 degree split is 20f @ 70f indoors. How often do you get below 20f?
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