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  1. Replies
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    I've never seen a gas furnace that DIDN'T have...

    I've never seen a gas furnace that DIDN'T have some sort of blower off delay unless it was hacked. 90 seconds is the MINIMUM delay time for most furnaces, many can be set as high as 3 minutes.
  2. Replies
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    Better yet, lets have homeowners opening their...

    Better yet, lets have homeowners opening their air handlers and hooking this thing up. What are the odds of the typical HO getting it right?
    https://www.youtube.com/watch?v=hsXDfII40h8#t=137
  3. Replies
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    4,097

    How many thermostats even have the common wire...

    How many thermostats even have the common wire ran? 2 out of 10? The thermostat in the video looks like a typical battery powered model, yet there just happens to be a common wire ran. How about...
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    528

    Why not get a single stage 40k instead?

    Why not get a single stage 40k instead?
  5. Replies
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    190

    You may have to go back to the manufacturer for...

    You may have to go back to the manufacturer for the OEM part. A tech may be able to sub a generic replacement.
  6. Is the house currently comfortable? Are room...

    Is the house currently comfortable? Are room temps even and do they hold reasonably steady between cycles? If the install is done right you won't notice when the furnace cycles on/off unless you are...
  7. (2) 240v appliances on a 60A service? Are you...

    (2) 240v appliances on a 60A service? Are you sure there isn't a 2nd breaker box somewhere? Check near the electric meter, that’s where they often mount them.
  8. Replies
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    http://vimeo.com/108391422

    http://vimeo.com/108391422
  9. Replies
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    528

    Since you are heating a relatively small space...

    Since you are heating a relatively small space look into a minisplit. It might make sense to can the gas meter and the monthly fees that go with it.
  10. The blower could be causing the water heater to...

    The blower could be causing the water heater to backdraft. Try just turning the blower on w/o heat and see if that makes any difference.
  11. Replies
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    Until they prohibit dry units, minimum SEER...

    Until they prohibit dry units, minimum SEER doesn't matter. Too many landlords that don't care what the delivered efficiency is.
  12. Replies
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    8,045

    Going to single speed PSC motors would help a...

    Going to single speed PSC motors would help a lot, efficiency is close to that of ECM on high speed. When they do a tapped winding for multi HP PSC motors it kills efficiency. In the south they are...
  13. Replies
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    1,211

    How does the board know if a 2 stage stat is...

    How does the board know if a 2 stage stat is connected and simply not calling for W2 vs. having a single stage stat hooked only to W1? Or does the board go into high fire after a delay regardless?
  14. Replies
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    The way I read it the 2nd stage NEVER fires the...

    The way I read it the 2nd stage NEVER fires the way it's currently hooked up. I see no option such as a DIP switch to tell the board if it's a single or 2 stage thermostat. The board has no way to...
  15. Replies
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    498

    Some will lock out the compressor at relatively...

    Some will lock out the compressor at relatively high outdoor temps because the object to the relatively cool air coming from the registers. Some have older heat pumps that don't work well when it...
  16. Replies
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    498

    Spend the money and get a thermostat with an...

    Spend the money and get a thermostat with an outdoor sensor. Worth every penny on a heat pump system. Most have 2 settings, 1 for locking out the strips above a certain temp, 1 for locking out the...
  17. Replies
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    515

    Without knowing the length and size of the duct...

    Without knowing the length and size of the duct going to each return it’s hard to say. The 320 is an average, some more, some less.
  18. Replies
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    498

    Some thermostats have the option for an outdoor...

    Some thermostats have the option for an outdoor sensor that locks out the strips below a certain outdoor temp.
  19. Replies
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    515

    4ton heat pump needs 1600CFM. You're expecting...

    4ton heat pump needs 1600CFM. You're expecting about 320CFMfrom each of those skinny returns which is why they are whistling.
  20. Sounds to me like it's a crappy design rather...

    Sounds to me like it's a crappy design rather than low entering air temps. WTF where they thinking with this design?
  21. Replies
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    413

    Lower setpoints save money, setbacks do not.

    Lower setpoints save money, setbacks do not.
  22. Replies
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    1,127

    Won't work on an AC circuit.

    Won't work on an AC circuit.
  23. Replies
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    Install a media filter and eliminate the need for...

    Install a media filter and eliminate the need for cleaning the blower/coil over the systems lifetime.
  24. Replies
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    515

    How many BTU is the furnace and what are it's...

    How many BTU is the furnace and what are it's minimum CFM requirements? How many returns and what size is each one? How many total sqft for the house?
  25. Does anybody happen to have photos of the header...

    Does anybody happen to have photos of the header failing from condensation in the exchanger?
  26. Replies
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    1,211

    Turn off all other gas appliances and clock the...

    Turn off all other gas appliances and clock the gas meter for the appliance in question. Take the number of seconds to burn 1cu ft and divide by 3600. 3600/42k = 86 seconds 3600/60k = 60 seconds. If...
  27. Low airflow and oversizing is what kills most...

    Low airflow and oversizing is what kills most heat exchangers.
  28. Replies
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    1,211

    The majority of furnace installs are oversized...

    The majority of furnace installs are oversized enough that the 2nd stage of heat isn't needed. Only when sizing is close to the actual load (rare) does W2 need to be hooked up. How many BTU is your...
  29. If your house really needs 4 tons to cool it you...

    If your house really needs 4 tons to cool it you have MAJOR insulation/heat gain problems. Fix the house and get heat gain to 3 tons or less.
  30. Replies
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    The furnace SHOULD run 24/7 on a design day.

    The furnace SHOULD run 24/7 on a design day.
  31. Replies
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    60k is more than enough for 3100sqft @ 30f if...

    60k is more than enough for 3100sqft @ 30f if it's built tight. You are under 20BTU per sqft, that in itself helps a lot with the hot/cold issues every time the system cycles. The mod unit is icing...
  32. Replies
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    444

    Depending on your heat loss, you may be better...

    Depending on your heat loss, you may be better off with a small 2 stage. Mod units start at 60K in many brands which means "forced oversizing" in some cases. A small 2 stage may be close on "low...
  33. Replies
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    5,630

    Id let the gas run in the small window that the...

    Id let the gas run in the small window that the HP can't keep up. With a 23c heat setpoint go over your house and check for drafts/leaks. High heat setpoints normally are indicators of drafts....
  34. Replies
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    5,630

    23c heat temp. What do you set your AC at in the...

    23c heat temp. What do you set your AC at in the summer?
  35. Replies
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    1,267

    The coils don't look that bad considering thier...

    The coils don't look that bad considering thier age, I think your problem is elsewhere. What were the results of your gas meter clocking?
  36. Replies
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    1,267

    AC coils can "look clean" but be clogged deep...

    AC coils can "look clean" but be clogged deep inside the fins. Especially possible is somebody has recently "cleaned the coil" without pulling it. Static pressure test is the only way to know for...
  37. Replies
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    Commercial still has belt drive on some of their...

    Commercial still has belt drive on some of their blowers. Not sure it makes sense for residential due to increased material costs.
  38. Replies
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    1,267

    With a 67f temp rise you are only within 8f of...

    With a 67f temp rise you are only within 8f of max. Plenum limit switch could be getting to 210f due to radiant heat from the heat exchanger. Are the burners staying lit the whole hour your house is...
  39. Replies
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    37c/67f temp rise isn't unusual for an older...

    37c/67f temp rise isn't unusual for an older furnace. If you are changing the furnace you will need to improve airflow and/or downsize the furnace. Newer furnaces run closer to 50f rise. The good...
  40. Most 4" to 6" media filter cabinets will work...

    Most 4" to 6" media filter cabinets will work fine. Use whatever your contractor sells.
  41. Replies
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    1,267

    Sure that it's newer than the coil?

    Sure that it's newer than the coil?
  42. Replies
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    287

    Why is the heat gain so high compared to heat...

    Why is the heat gain so high compared to heat loss? You're in VA, not TX. With a 25k heat loss, heat gain should be 15-20k for VA.

    All-electric Heat Pump is a great idea if you plan on eventually...
  43. Replies
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    360

    Are you getting a 33 degree rise? Use the closest...

    Are you getting a 33 degree rise? Use the closest return/register if you can't do it right at the unit. Keep in mind there will be some heat loss in the ductwork.
  44. Replies
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    940

    The test MUST be done between coil and furnace in...

    The test MUST be done between coil and furnace in order to account for a plugged coil. Blower wheel probably needs cleaning also.
  45. Replies
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    940

    Coil must REALLY be plugged up to make a 40k trip...

    Coil must REALLY be plugged up to make a 40k trip limit.
  46. You can get 1600 CFM through the opening, just...

    You can get 1600 CFM through the opening, just not through a single 25x25x1" filter. A 4" 20x25 filter can flow 1600CFM at a reasonable static pressure.
  47. Replies
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    940

    How many BTU on that York?

    How many BTU on that York?
  48. No way a single 25x25 1" filter is flowing...

    No way a single 25x25 1" filter is flowing 1600CFM, especially a merv 12. Sure the system will work, it will just be at a much reduced capacity. Oversizing normally hides the lost capacity, but your...
  49. Replies
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    453

    I've seen Carrier's that tap the inducer motor...

    I've seen Carrier's that tap the inducer motor for the HUM terminal. HUM terminal energized any time the inducer is powered. "Normal Operation".
  50. Replies
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    Is this a package unit or air handler? If so,...

    Is this a package unit or air handler? If so, external static pressure should already have coil figured in. You can measure temp rise and get close on CFM IF the heat is operating at rated output.
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