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  1. #183
    Join Date
    Sep 2019
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    On a different note, I was asked by TRHVAC via a thread from this site, which I can not yet post on, if the stat failures can cause a frozen coil and damage that coil. Others have chimed in on that thread saying no, this can not cause a coil to freeze. Actually, it depends on which coil TRHVAC is asking about, indoor or outdoor. We have had 3 indoor coils frozen in the past couple weeks due to the outdoor unit reversing valve being energized in cooling mode while the system was calling for heat. The homeowners finally called us when no air was coming out of their registers, due to the indoor coil being covered in ice, and they were getting cold. This issue is caused by the T6 stat energizing the reversing valve to cooling mode when it should not be. Basically, the outdoor unit is running in cooling mode in 20 degree weather. So, yes this issue can cause a frozen indoor coil. However, in 32 years as a service tech and HVAC educator, it is very rare to have an indoor coil build up enough ice to actually be damaged. I have seen hundreds of outdoor coils that were damaged by ice, usually because of being set below snow level or failed defrost controls or poor drainage. Hope this helps and gets to TRHVAC.

  2. #184
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,183
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    Okay.

    When you post about a frozen coil in January, the outdoor is going to be the assumption unless you post that you are in a warm climate and the unit is operating in AC mode.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  3. #185
    Join Date
    Sep 2019
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    Yes, I totally agree. And with so many heat pumps in our area, that is why I train our techs to say outdoor or indoor coil rather than evaporator or condenser coil.

  4. #186
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    44,340
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    Quote Originally Posted by outdoor junkie View Post
    Yes, I totally agree. And with so many heat pumps in our area, that is why I train our techs to say outdoor or indoor coil rather than evaporator or condenser coil.
    You are probably already aware of this...

    However may I suggest to read TimeBuilders post above (with the airplane mishap picture), specifically his sig line...

    And get your posts up...
    Then apply for PRO status!

    Your experience would be much appreciated in the PRO section!

    THX
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

  5. #187
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,183
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    He only needs 11 more posts to be able to apply, and he can use the blue link in the bottom of my signature area...which reads, "how to become a professional member."
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  6. #188
    Join Date
    Aug 2018
    Location
    Piedmont Triad, NC
    Posts
    791
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    Quote Originally Posted by outdoor junkie View Post
    Yes, I totally agree. And with so many heat pumps in our area, that is why I train our techs to say outdoor or indoor coil rather than evaporator or condenser coil.
    I refer to them the same way but it’s funny when you’re trying to explain to a customer which coil is which in a package unit ”but they’re both outdoors”


    Sent from my iPhone using Tapatalk

  7. #189
    Join Date
    Sep 2019
    Posts
    11
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    Thanks Timebuilder. Many years ago I used to be on this site regularly, and then life got busy and I stopped using and helping this resource. Shame on me.
    Once I reach the prescribed number of posts, I will apply for pro status.
    I also appreciate your life verse. mine is 1 Corinthians 10:13.
    Have a great day and remember, we should learn from the past, but today is the first day of the rest of your life.

  8. #190
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,183
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    Cool. Temptation is ever present.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  9. #191
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,183
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    NEWS:

    I have just picked up a Series 6, T6 stat at the supply house and tested it for the W1 output, and it works.

    This suggests to me that they may have fixed their issues.

    I had a total if 15 defective stats in the past 8 weeks.

    This is really good news.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  10. #192
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    44,340
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    Quote Originally Posted by timebuilder View Post
    NEWS:

    I have just picked up a Series 6, T6 stat at the supply house and tested it for the W1 output, and it works.

    This suggests to me that they may have fixed their issues.

    I had a total if 15 defective stats in the past 8 weeks.

    This is really good news.
    What is the serial number???

    Yeah, black out a few digits... interested in the last 4 + the sideways number...
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

  11. #193
    Join Date
    Sep 2019
    Posts
    11
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    Thank you for that info. We have not yet seen a version 6. Make sure there is no output on the "O" terminal during heating mode with a heat pump.
    That has been our biggest problem.

  12. #194
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    44,340
    Post Likes
    Given the 'O' and 'B' modes of HP operation...

    Wonder if the factory in China had a 'fubar'...
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

  13. #195
    Join Date
    Sep 2019
    Posts
    11
    Post Likes
    The story that I got was that they got one of the components, they called it a relay but I doubt if that is what it was, that they use in the stat from a different vendor and it is allowing voltage to pass through to the "O" terminal during the heating mode of a heat pump. Our rep says this issue has caused Resideo to change the way they test their stats to assure that they function correctly. That is encouraging. I have not yet asked if Resideo is going to help cover our costs to go back to all these homes that are having issues. They are all under 1 year old and we have a 100% quality assurance to our clients, so we cover the cost. Time will tell on that question.

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