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  1. Replies
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    Have the installer that says the install is...

    Have the installer that says the install is correct, show you the install manual that says that.

    It will greatly shorten the life of the furnace heat exchanger. By causing condensate to form...
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    No it wouldn't. It would be in the normal air...

    No it wouldn't. It would be in the normal air stream, and would never get hot enough to create phosgene gas.
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    The front of the return plenum should have been...

    The front of the return plenum should have been simply cut shorter to butt against the furnace. And it still should be sealed to the furnace to prevent return leakage.

    The sealtite is ran...
  4. While every so often a new digital stat will be...

    While every so often a new digital stat will be out of calibration. Fairly far a few between.

    What you might want to try. Is raise the set temp 1 degree and see how it feels to you in a day or...
  5. Lower RH. A 2% drop in RH can make a room feel...

    Lower RH. A 2% drop in RH can make a room feel much cooler than your use to.
  6. Won't matter if its 2 amps less. Your genny is...

    Won't matter if its 2 amps less. Your genny is too small. Since the condenser fan and indoor unit's fan will also be starting.
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    Wow. All that over how to pull a vacuum.

    Wow. All that over how to pull a vacuum.
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    Its running low pressures due to outside temp....

    Its running low pressures due to outside temp. Its going to have gurgling noise. Not unusual.
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    Actually, at 60 outside temp, the refrigerant is...

    Actually, at 60 outside temp, the refrigerant is condensing rather rapidly. And the head pressure is a bit too low. So that when the refrigerant reaches the indoor unit, it is already starting to...
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    Ah, its most likely the running in cooling mode...

    Ah, its most likely the running in cooling mode when its only 60 outside causing the gurgling.
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    Okay, that makes sense for it then.

    Okay, that makes sense for it then.
  12. Replies
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    Mechanical noise then. Won't matter what furnace...

    Mechanical noise then. Won't matter what furnace you have then. You'll still have some mechanical.

    Does the furnace room door face a hallway? If so, might be possible to relocate the return to...
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    Okay, you currently have a 4 ton system. A new...

    Okay, you currently have a 4 ton system.

    A new 4 ton could have a compressor rated at 40,000 or 42,000 BTUS . Depending on unit SEER/EER rating.

    You never go by compressor rating only.
  14. Replies
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    Okay. Is it mechanical noise, or air noise that...

    Okay. Is it mechanical noise, or air noise that you hear? If air noise, its too small. 20x30 would be better for 3 tons. Allows the air to move slower through the grille.

    What size is the duct...
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    I'd wonder why the EEV is at 100% when the air...

    I'd wonder why the EEV is at 100% when the air handler is only at 300 CFM.
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    Then neither line size will have any real effect...

    Then neither line size will have any real effect on oil return.

    The 7/8" line size is just to get closer to the SEER/EER rating, and won't have any noticeable effect on cooling performance. Its...
  17. Replies
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    Post the actual model number of the condenser. ...

    Post the actual model number of the condenser.

    A 42,000 BTU compressor. May be rated that at 105, or 130 condensing temp. So the condenser model number is important.
  18. Replies
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    Could be that the return is under sized, and...

    Could be that the return is under sized, and causing the noise, not the furnace itself.
  19. Probably because the evap coil is not dry when...

    Probably because the evap coil is not dry when the heat comes on after a dehumidify call.
  20. Replies
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    Nope, won't harm it.

    Nope, won't harm it.
  21. Depends on what your area's outdoor temps are. If...

    Depends on what your area's outdoor temps are. If outdoor temps are above 35C, then fans can't cool the area to 35C.
  22. https://i.ibb.co/CWRmZqB/IMG-6947.jpg May have...

    https://i.ibb.co/CWRmZqB/IMG-6947.jpg

    May have rubbed through.
  23. With them keeping it at 72/73 doubt they will...

    With them keeping it at 72/73 doubt they will have much increase in indoor humidity.

    Not thinking moisture getting into duct. But maybe they aren't running the bathroom exhaust fan long enough....
  24. Have the contractor increase the blower...

    Have the contractor increase the blower speed/CFM.

    Could also be the insulation of the ceiling can is loose and sweating.
    '
    Does the tenant have an aquarium near the area with condensate?
    ...
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    Could be they didn't set the blower to proper...

    Could be they didn't set the blower to proper speed/CFM.
  26. Sorry, we're not a DIY site. Thread closed.

    Sorry, we're not a DIY site.

    Thread closed.
  27. Replies
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    Wow R410A itself is slightly more efficient. It...

    Wow R410A itself is slightly more efficient. It doesn't make a 25. ton R410A unit have a higher capacity then an R22 2.5 ton unit. So they were blowing smoke at you about it being that its more...
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    Is the condenser above the evap. If not, the...

    Is the condenser above the evap. If not, the larger vapor line has no virtually no effect on oil return. It simply gets you about 500 BTUs an hour more cooling than a 3/4" vapor line.
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    Not very likely. How are you going to get to the...

    Not very likely. How are you going to get to the job site.
  30. Replies
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    Your opening post seems to be asking what model...

    Your opening post seems to be asking what model line that furnace and A/C are from. And he answered that question.
  31. Replies
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    Yep, needs more than 1 ton. Going just by the...

    Yep, needs more than 1 ton.

    Going just by the time increase it would take compared to the current 2.5 ton.
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    1 ton wouldn't be enough.

    1 ton wouldn't be enough.
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    Prices are not allowed.

    Prices are not allowed.
  34. Replies
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    Then a 2 ton shouldn't need to run more than 25...

    Then a 2 ton shouldn't need to run more than 25 to 30 minutes. A 1.5 ton, about 40 to 45 minutes.
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    Okay. If your current unit had to run 30 minutes...

    Okay. If your current unit had to run 30 minutes on a 90 day, a 2 ton would then in theory have to run37 minutes.
  36. Replies
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    When your current unit was working. On the...

    When your current unit was working. On the hottest days, did it run 24/7, and still not maintain thermostat set temp. Or did it cycle on and off, and maintain thermostat set point.
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    Number of vents, isn't as important as the size...

    Number of vents, isn't as important as the size of those 3 vents is.

    I've put 10 tons in a place that only had 8 vents. Of course, they were sized to handle 10 tons.
  38. Replies
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    Manual T does select the registers and type of...

    Manual T does select the registers and type of register.

    Even with good windows. Washing the outside walls counts. Helps prevent you from feeling the radiant effect of losing body heat to the...
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    Sorry, we're not a DIY site. Thread closed.

    Sorry, we're not a DIY site.

    Thread closed.
  40. Replies
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    It may be possible to zone it. Depends how the...

    It may be possible to zone it. Depends how the trunk line is ran.
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    See his other thread from 2019, you posted in it....

    See his other thread from 2019, you posted in it.

    https://hvac-talk.com/vbb/threads/2206427-Evaporator-Coils-freezing
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    At 54 outside temp, your going to be running...

    At 54 outside temp, your going to be running close to LP trip pressure. Next time its that cool outside, cover part of the condenser coil to keep the head pressure up, to get a longer run time....
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    So when the standing pressure was 155. It was...

    So when the standing pressure was 155. It was 54F outside?
  44. Replies
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    Sorry, we're not a DIY site. Thread closed.

    Sorry, we're not a DIY site.

    Thread closed.
  45. Replies
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    Does the VAV have a reheat in it. If so, is that...

    Does the VAV have a reheat in it. If so, is that coming on when it shouldn't.
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    Prices removed, they are not allowed here.

    Prices removed, they are not allowed here.
  47. The 10-2 romex is not ran compliant with...

    The 10-2 romex is not ran compliant with electrical code. It needs to be protected.

    Line set should be off the ground/floor.
  48. Hire an engineer. He can spec out everything that...

    Hire an engineer. He can spec out everything that needs done.
  49. Identifying what components could cause it, and...

    Identifying what components could cause it, and what ones can't. Would be aiding in DIY diagnostics.

    Thread closed.
  50. Replies
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    Actually. A bypass humidifier(Aprilaire 600) only...

    Actually. A bypass humidifier(Aprilaire 600) only uses 6 gallons to put .75 gallons into the air, and clean itself. So 12 gallons to put 1.5 gallons into the air, and clean itself.
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