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  1. Replies
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    Seems like they put a LOT into the "sales EER"....

    Seems like they put a LOT into the "sales EER". Have you thought about charge level vs. Sales EER? Charging procedure could be optimized to increase sales EER, but loose real EER. With a typical...
  2. FWIW I have a 44k furnace in my 1600sqft house....

    FWIW I have a 44k furnace in my 1600sqft house. Was still cycling when it was 5 degrees outdoors last winter. My house is a LOT newer though, 1999 construction. Unless your house is really leaky an...
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    14-16 SEER is worth buying IMHO, you do actually...

    14-16 SEER is worth buying IMHO, you do actually get a bigger outdoor coil and TXV. Once you go beyond 16 SEER sales EER takes over with silly hat tricks that don't save the homeowner on their power...
  4. 100,000BTU is a LOT of heat loss on a 1800sqft...

    100,000BTU is a LOT of heat loss on a 1800sqft house. Think about how much heat the furnace is pumping out and that ALL of it is leaking to the outside. Is it better to install a giant furnace or fix...
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    3.5 tons for 1700sqft sounds like '500sqft per...

    3.5 tons for 1700sqft sounds like '500sqft per ton' sizing. The 4 ton quotes are based on the averaging of the 5ton condenser with 3 ton furnace blower.
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    ECM's also have value for real energy savings...

    ECM's also have value for real energy savings when used with smaller systems. A furnace with a "3 ton blower" (the smallest you can buy from many manufacturers) installed with a 2 ton condenser will...
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    To get the rated SEER requires a certain air...

    To get the rated SEER requires a certain air handler and tonnage to begin with which rarely happens. The "up to" tonnage is typically awarded to the smaller units (under 3 ton) which are rarely...
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    1400CFM ton at 0.3" static? I'd like to see that...

    1400CFM ton at 0.3" static? I'd like to see that outside of lab conditions!! The factory default "green tap" is more appropriate for real world conditions, that's why it ships as such. Customer will...
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    2,870

    Most systems don't deliver the full 400CFM/ton...

    Most systems don't deliver the full 400CFM/ton with either motor due to ductwork issues. Dumping the multi speed PSC and going with a single high speed would get PSC efficiency closer to that of an...
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    2,870

    A too large duct system is a rare find indeed......

    A too large duct system is a rare find indeed... At what static pressure would you consider a duct system too large?
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    Depends on how bad the ductwork actually is. If...

    Depends on how bad the ductwork actually is. If ductwork is tight but can only deliver 800CFM at a reasonable static pressure, swapping a 3ton out with a 2ton may be a good solution if the customer...
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    If a customer can't/doesn't want to fix the...

    If a customer can't/doesn't want to fix the ductwork why not install a smaller system? It's not like the larger system will deliver it's rated capacity anyway..
  13. Think about all the failed heat exchangers you...

    Think about all the failed heat exchangers you have seen in the field. How many are 4 or more burners? How many 3 burners? Have you ever seen a 2 burner with a bad heat exchanger?

    90%+ furnaces...
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    I have yet to find a study that proves/disproves...

    I have yet to find a study that proves/disproves the east/west energy difference. East/West placement is NOT the same as simply shading the condenser. The air temp of a thermometer shielded from...
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    Considering most people keep their stat at 75F,...

    Considering most people keep their stat at 75F, not 80F then 77F ODB is the appropriate temp for SEER. Same 2 degree hill, right? I dunno about you, but 80f indoors is a service call for me, most...
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    EWB @ 60F/ODB @ 85F is close to the same "hill"...

    EWB @ 60F/ODB @ 85F is close to the same "hill" as the standard 95F ODB /67F EWB standard used to test EER. 12 EER is decent for most systems, your input/output is close to my own 2 ton system. Do...
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    X3 In the spring/fall one floor may need...

    X3

    In the spring/fall one floor may need heating/cooling and the other floor wont need anything.
    If one system goes down, you can go to the cool/warm part of the house until normal business hours...
  18. Thread: Low humidity

    by 54regcab
    Replies
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    348

    Verify that your hydrometer is accurate, set it...

    Verify that your hydrometer is accurate, set it outside and compare to local weather data. Most have a tolerance of +/- 5%, I've seen them be off 10-15%
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    Orfice is less work?

    Orfice is less work?
  20. Thread: R22 vs 410

    by 54regcab
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    652

    Which specific units are you looking at? Each...

    Which specific units are you looking at? Each brand has it's entry, mid, and high level units.
  21. Thread: R22 vs 410

    by 54regcab
    Replies
    24
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    652

    R22 is already expensive and I don't see the...

    R22 is already expensive and I don't see the price dropping in the future.

    A matched system is required to get the rated efficiency out of the unit.
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    TXV offers superior humidity control at low...

    TXV offers superior humidity control at low outdoor temps. Keeps more of the coil surface working by maintaining constant superheat. Net result is a colder coil at lower outdoor temps. Better...
  23. Setting the thermostat higher isn't the same as...

    Setting the thermostat higher isn't the same as not being able to keep up. When it's not able to keep up, humidity is LOW and there is a continuous cool draft. When thermostat is simply set higher,...
  24. My FIL does roofing. 2 types of flat roofs, ones...

    My FIL does roofing. 2 types of flat roofs, ones that leak and those that will leak. Sloping so that water doesn't puddle helps considerably, but is difficult to do after the roof is already built.
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    Non-condensibles in the system will also cause...

    Non-condensibles in the system will also cause poor performance.
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