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  1. Yep, thatís liquid migration.

    Yep, thatís liquid migration.
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    Sorry, this is not a DIY site. Thread closed.

    Sorry, this is not a DIY site.

    Thread closed.
  3. Merged your threads.

    Merged your threads.
  4. The LL is sweating due to liquid migration when...

    The LL is sweating due to liquid migration when the outside temp is lower then the indoor temp.

    How cold outside is it when you have the varying line temp while it runs.
  5. That doesn’t work if the damper is stuck closed.

    That doesn’t work if the damper is stuck closed.
  6. If the register is in the middle of the ceiling...

    If the register is in the middle of the ceiling then a one way throw would give good air mix.
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    I believe the post edit time limit is 30 minutes.

    I believe the post edit time limit is 30 minutes.
  8. Might need to switch to a smaller register to get...

    Might need to switch to a smaller register to get better throw.
  9. Do NOT do a way with the hotel’s chiller...

    Do NOT do a way with the hotel’s chiller redundancy.
  10. Will the room have its own return or will it use...

    Will the room have its own return or will it use an under cut door?
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    Does it do this if you leave the air filter panel...

    Does it do this if you leave the air filter panel open.
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    You have a 23,000 BTU air handler on a 1.5 ton...

    You have a 23,000 BTU air handler on a 1.5 ton condenser. Wonder why they choose to go with such a large air handler for a 18,000 BTU condenser.

    Sounds like the blower is working against too high...
  13. I believe the 21 cents was the OP's utility...

    I believe the 21 cents was the OP's utility electric rate at night time when he isn't getting power from his panels.
  14. Be cheaper to just always use the nat gas...

    Be cheaper to just always use the nat gas furnace. And only use the heat pump if the gas furnace stops working.
  15. When I enter the numbers in Carrier software. I...

    When I enter the numbers in Carrier software. I come up with 48,278 sensible, and 69,257 latent. Not possible for a 5 ton. Either the air state readings are wrong, or the CFM.
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    If that horizontal run under the slab is as long...

    If that horizontal run under the slab is as long as the drawing makes it look. It will be real hard to unclog it down the road.
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    It is now.

    It is now.
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    Moved to AOP.

    Moved to AOP.
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    https://hvac-talk.com/vbb/forumdisplay.php?12-Refr...

    https://hvac-talk.com/vbb/forumdisplay.php?12-Refrigeration-amp-Ice-Making
  20. If your doing set back to save on cost. Then you...

    If your doing set back to save on cost. Then you will save very little if you use any electric off of the grid. Maintaining temp with the heat pump without set back is probably your best bet. Since...
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    What was the outdoor temp. Piston or TXV system?...

    What was the outdoor temp. Piston or TXV system? LLFD inside condenser or outside.
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    Yep, made the third week of 2002.

    Yep, made the third week of 2002.
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    Sorry, this is not a DIY site. Thread closed.

    Sorry, this is not a DIY site.

    Thread closed.
  24. Replies
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    No, an under loaded PSC motor doesn't do well....

    No, an under loaded PSC motor doesn't do well. They tend to over heat.
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    Poll: It might have had an effect, it might not have. ...

    It might have had an effect, it might not have.

    The outdoor unit control wiring short does not actually go through the circuitry of the board.
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    Poll: A large service company.

    A large service company.
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    Poll: Fixed thread.

    Fixed thread.
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    Did you replace 1/3 HP motors with 3/4 or 1 HP...

    Did you replace 1/3 HP motors with 3/4 or 1 HP motors. Or visa versa.
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    In your opening post, I don't see where you say...

    In your opening post, I don't see where you say verified the thermostat was actually working. By checking the terminals or thermostat wires to see if the Y had 24 volts on it.
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    Post the serial number of the outdoor unit, and...

    Post the serial number of the outdoor unit, and we can probably tell you how old it is.
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    Sorry, this is not a DIY site. Thread closed.

    Sorry, this is not a DIY site.

    Thread closed.
  32. TESP measured. Along with the coil's pressure...

    TESP measured. Along with the coil's pressure drop checked. If coil is dirty, having it cleaned, and then the TESP and pressure dropped rechecked. Will also tell you if your duct work is suitable.
    ...
  33. That can be difficult for some areas. Might...

    That can be difficult for some areas.

    Might want to try the Contractor Locator Map link in my sig.
  34. Its easy to tall if the indoor coil is dirty or...

    Its easy to tall if the indoor coil is dirty or not. A Static PD check often confirms its condition one way or the other.

    Depends if he wrote in the contract that you get the info or not. As to...
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    While your at it, replace the existing LLFD. It...

    While your at it, replace the existing LLFD. It could be restrictive and caused it to look like the system was low on charge when the other tech was there.
  36. Actually, EPA regs always required R410A to be...

    Actually, EPA regs always required R410A to be recovered. Even though it didn't specifically list R410A. It said ALL Chemicals used as a Refrigerants.

    PS: We don't talk prices here.
  37. An actual TESP measurement would tell you how...

    An actual TESP measurement would tell you how much air the furnace is moving. The install manual has a chart in it to check against.

    Again, your current coil may be very dirty, and should be...
  38. Well, if he measured the supply static in the...

    Well, if he measured the supply static in the plenum after the A/C coil. He didn't get a very useful reading. The reading should have been taken between the A/C coil and the furnace. Then a reading...
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    Submittal sheet for it says: Enhanced mufflers –...

    Submittal sheet for it says: Enhanced mufflers – help to dissipate vibration energy for quieter unit operation
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    What is the full model number of your outside...

    What is the full model number of your outside unit. Or at least the tonnage of it.
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    While the former owner could have covered up lint...

    While the former owner could have covered up lint problems. With all the return air coming through the basement, the chemicals would be diluted very similar as if the laundry room was a separate...
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    Sorry, this is not a DIY site. Thread closed.

    Sorry, this is not a DIY site.

    Thread closed.
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    Okay, now that you listed several of the possible...

    Okay, now that you listed several of the possible reasons he didn't doesn't talk to you.

    Other than you don't believe he would have listened to you. What good reason do you have for not warning...
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    Safe, yes. Efficient, not really.

    Safe, yes.

    Efficient, not really.
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    OBL uses an ECM blower motor. OVL uses a VS...

    OBL uses an ECM blower motor.

    OVL uses a VS ECM blower motor.

    Both are furnaces are rated at .5 static.
  46. How evasive varies with the house. If a tech...

    How evasive varies with the house.

    If a tech evaluates a system just by checking refrigerant pressures, he really isn't checking properly. Needs to go by SC and SH. He should also check actual air...
  47. Like many things in new construction. The actual...

    Like many things in new construction. The actual HVAC job was subbed out to an HVAC sub contractor. Probably the lowest bidding one. So yes the duct work could be that bad. And often is.

    Depending...
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    The RTU the OP is working on. Has 2-7.5 ton...

    The RTU the OP is working on. Has 2-7.5 ton circuits/compressors.

    When the Rawal valve is maintaining the evap pressure/saturation. The compressor is not working as hard as it would if it was...
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    Moved to AOP.

    Moved to AOP.
  50. Way back in the 70s. It was all pipe dope around...

    Way back in the 70s. It was all pipe dope around here. Didn't hear of thread sealant being used on pipes until the mid to late 80s.
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