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  1. Thread: New HVAC Help

    by 54regcab
    Replies
    10
    Views
    247

    Dog and Pony show. I'll bet your current unit is...

    Dog and Pony show. I'll bet your current unit is also a 4 ton. It's difficult to find somebody to break away from the "500sqft per ton" rule. What is their incentive to install a smaller unit?...
  2. Replies
    5
    Views
    166

    I question the accuracy of a 3 ton system short...

    I question the accuracy of a 3 ton system short cycling with a 32k load. Smells a lot like "500sqft per ton" was used to determine unit size.
  3. Thread: New HVAC Help

    by 54regcab
    Replies
    10
    Views
    247

    Looks like yet another "500sqft per ton" sizing...

    Looks like yet another "500sqft per ton" sizing job...
  4. Thread: New HVAC Help

    by 54regcab
    Replies
    10
    Views
    247

    The upside down settings on your thermostat (set...

    The upside down settings on your thermostat (set higher in winter than summer) suggest your house either has high humidity in summer is is drafty in winter. If it's spring/fall and 75f in your house...
  5. If your house had all these energy upgrades, why...

    If your house had all these energy upgrades, why are you being quoted the standard "500sqft per ton"? Your house should have a MUCH lower heat gain and take considerably less tonnage to cool it.
    ...
  6. Why do you need 80,000BTU to heat a 1600sqft...

    Why do you need 80,000BTU to heat a 1600sqft house in Austin? A 40k should be more than enough unless your house has a crazy amount of leakage. If your house leaks that much, FIX THE LEAKS instead of...
  7. Replies
    4
    Views
    197

    It depends. If your house is tight and you don't...

    It depends. If your house is tight and you don't have Time Of Use electric rates setbacks don't save much. Especially not worth it if somebody is home all day.

    If you have a leaky house and/or TOU...
  8. Replies
    34
    Views
    708

    "500sqft per ton is the most common "rule of...

    "500sqft per ton is the most common "rule of thumb" for sizing HVAC systems. It's the way many contractors have been doing it for years and some aren't willing to do an Honest man J for fear of...
  9. Replies
    34
    Views
    708

    Looks a lot like "500sqft per ton"

    Looks a lot like "500sqft per ton"
  10. How much heat did does it show from internal...

    How much heat did does it show from internal loads?
  11. Did you use 90/79 in your man j program? Smaller...

    Did you use 90/79 in your man j program? Smaller units will run a LOT which helps with dehumidification.
  12. Cracked heat exchanger could have very well been...

    Cracked heat exchanger could have very well been caused by low airflow. Low airflow will cause furnace to cycle on high limit and not deliver it's rated capacity.
  13. Look at your indoor/outdoor design temps. Are you...

    Look at your indoor/outdoor design temps. Are you OK with the system slipping a few degrees during the most extreme weather? Some people want it 72 indoors when it's 102 out doors, other are OK with...
  14. Replies
    13
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    428

    Trane = American Standard.

    Trane = American Standard.
  15. Replies
    186
    Views
    5,159

    Do I see a backward inclined blower wheel in the...

    Do I see a backward inclined blower wheel in the Daikin or is it just my imagination?
  16. Replies
    145
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    6,849

    Vacuum tubes haven't been used since the 1970's...

    Vacuum tubes haven't been used since the 1970's on a mainatream basis. Solid state improved reliability dramatically and a lot of "tube jockeys" went out of business.
  17. Replies
    186
    Views
    5,159

    What happens if you install a single speed motor...

    What happens if you install a single speed motor (won't be in the chart)? Same HP requirement as the multi speed on high, but should use less wattage since single speed motors are more efficiency...
  18. Replies
    186
    Views
    5,159

    Never would have thought that Goodman of all...

    Never would have thought that Goodman of all people would be the ones to do it. Several of their models have the higher min temp rises. The blowers seem stronger than most newer PSC stuff, many get...
  19. Replies
    186
    Views
    5,159

    40 degree min ended right before the 33" high...

    40 degree min ended right before the 33" high furnaces came out? Were the blowers capable of enough CFM to get below 40f? Post back if you can find one, ive not seen it.
  20. Replies
    34
    Views
    708

    Ive got a 1600sqft house im cooling with 2tons....

    Ive got a 1600sqft house im cooling with 2tons. Design temp 75f indoors/97f outdoors.
  21. Replies
    186
    Views
    5,159

    Did you account for the lower static pressures...

    Did you account for the lower static pressures generated at a lower speed?
  22. Replies
    145
    Views
    6,849

    SMPS has been common in TV's since the 1990's. I...

    SMPS has been common in TV's since the 1990's. I haven't seen a TV this century that doesn't have SMPS. The "old" big box HDTV's had them. Some of those did run 500W, you could FEEL the heat coming...
  23. Replies
    186
    Views
    5,159

    Icanhas, I see your point about CFM/watt...

    Icanhas, I see your point about CFM/watt remaining stable with various PSC speed taps. My question is what is the difference in CFM/watt for a single speed PSC vs multi-HP PSC? Keep in mind 90% of...
  24. Replies
    186
    Views
    5,159

    I've seen the 40f min rise, but they are on...

    I've seen the 40f min rise, but they are on furnaces that are least a decade old. Small blower/high BTU models of yesteryear, I'm not sure if even those were able to get below min temp rise on high...
  25. Replies
    186
    Views
    5,159

    I'm not seeing where the blowers produce enough...

    I'm not seeing where the blowers produce enough CFM on high speed to get the furnace under the 30f high fire/15f-20f low fire min temp rise spec. Can you give a specific temp rise on a particular...
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