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Type: Posts; User: dx

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  1. Replies
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    Problem resolved. He replaced coil with correct...

    Problem resolved. He replaced coil with correct one. TXV was correct already.
  2. Don't count on it. You can read more about it...

    Don't count on it.

    You can read more about it on the internet, all I'll say is it doesn't mean anything. We contractors are constantly solicited by BBB and there have been many accusations that...
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    Yes that is a red flag. I believe even a 15 SEER...

    Yes that is a red flag. I believe even a 15 SEER would not qualify for the tax credit, but you don't need to take anyone's word for it. Ask them to give you a copy of the AHRI Certificate for that...
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    Yes, I looked that up myself before I posted....

    Yes, I looked that up myself before I posted. Just wanted to see if any of the pros here might know something I don't.
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    Goodman A/C coil match

    Having a bit of a "confusion" with my installer. If someone familiar with the Goodman line can comment, I'd appreciate it.

    Installed Goodman SSX16024 A/C and indoor coil. Coil is CAPF1824. If I...
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    I would think your dealer/installer should be...

    I would think your dealer/installer should be able to tell you in minute detail why he chose the one they recommend. And what the differences are. If he can't or won't, then I would look for another...
  7. Thread: Defrost cycle heat

    by dx
    Replies
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    1,084

    This is not a DIY question and there is nothing...

    This is not a DIY question and there is nothing to "do" or take care of. There isn't any specific equipment involved. It's a general "can it be done?" question.

    So I will rephrase it: Do most (or...
  8. Thread: Defrost cycle heat

    by dx
    Replies
    14
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    1,084

    Thanks but neither post explains HOW. I assume...

    Thanks but neither post explains HOW.

    I assume the thermostat does the "locking out" or crossover, so only the HP or the furnace runs at one time, not both. I am assuming a t-stat with crossover...
  9. Thread: Defrost cycle heat

    by dx
    Replies
    14
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    1,084

    Defrost cycle heat

    In a dual fuel system, is there a way to kick the furnace on during defrost so you don't get cold air? I mean, without having to jury-rig your own control board, with umpteen relays and stuff.
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    Skipped, The load requirements were determined...

    Skipped,

    The load requirements were determined largely from the existing equipment, which works fine and doesn't short-cycle. I will do a load calc, but don't expect any surprises.

    As a GC I...
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    The most common type of controller: ...

    The most common type of controller:

    http://en.wikipedia.org/wiki/PID_controller
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    Heat pump requirements and sizing

    I am replacing a gas furnace/conventional A/C with a dual fuel heat pump. My cooling requirement is 2.5 ton. My heating is 70kBTU.

    I can realize savings running the HP down to about 30F. However,...
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    Thanks guys. That will work great and a lot...

    Thanks guys. That will work great and a lot cheaper than rewiring.
  14. Replies
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    Thermostat wiring requirements

    Trying to figure out my wiring limitations before I get too far into selecting equipment.

    Current thermostat wiring is a 4-wire cable. Layout is such that it would be expensive to replace the...
  15. Thread: Dual fuel question

    by dx
    Replies
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    1,057

    Help me understand how that can happen. The air...

    Help me understand how that can happen. The air gets cooled and dehumidified as it goes through the coil. Then it hits the heat exchanger, which cannot be at a lower temp.

    You normally get...
  16. Thread: Dual fuel question

    by dx
    Replies
    23
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    1,057

    I didn't quite get that one either. How would it...

    I didn't quite get that one either. How would it cause condensate on the heat exchanger? In heating mode, you would have warm air exiting the coil and hitting the heat exchanger. Granted, the heat...
  17. Thread: Dual fuel question

    by dx
    Replies
    23
    Views
    1,057

    Dual fuel question

    We rarely do dual fuel (heat pump w/gas furnace) in this area, but I have an inquiry for one and my HVAC guy says they normally set it up with a lockout point so only one system is on at a time.
    ...
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    dan_sw_fl, I think you are missing the point. I...

    dan_sw_fl, I think you are missing the point. I work on a lot of houses where the basement is too cold in the summer. Even with all duct leaks sealed and no registers, I routinely see basements at...
  19. Thread: Motor Drag On Rheem

    by dx
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    1,154

    Well, does it still drag with the heavier wire?

    Well, does it still drag with the heavier wire?
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    Dan, what is the R value of that 3/8" foam? :)

    Dan, what is the R value of that 3/8" foam? :)
  21. Thread: p traps

    by dx
    Replies
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    1,014

    RoBo, hvac contractors around here install a...

    RoBo, hvac contractors around here install a simple, cheap clear PVC line routed in the shape of a trap. Seems to work OK, easily inspected for blockage and easily cleaned and/or replaced.
    I looked...
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    DEC, thank you. Precisely. Just look at it. Just...

    DEC, thank you. Precisely. Just look at it. Just aluminum foil. Aluminum is a good heat conductor, not insulator. Only good for radiant barrier, as aluminum has very good reflectivity.
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    Bubble foil is radiant barrier and needs airspace...

    Bubble foil is radiant barrier and needs airspace for the R ratings stated. Read the rfoil site carefully. A better product for ducts in the basement is the 6" and 8" fiberglass/foil sleeves...
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    While you certainly have a number of issues, be...

    While you certainly have a number of issues, be advised that making a return duct by attaching sheetmetal to the bottom of the joists, when done properly, is not an issue. It is called joist spanning...
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    Yup, the old Cadillac example only proves the...

    Yup, the old Cadillac example only proves the OP's point. The cylinder cut-off is alive and well in several brands today and works perfectly. Cadillac had the right idea with the old V8-6-4, but the...
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