Should indoor fan shut down when Heat Pump on defrost? - Page 2
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  1. #14
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    @ beenthere,
    Actually, I did not get a reply from post #6

    I can changed the time --- I have built and programmed my own control board.

    pilko

  2. #15
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    barbar. Read this post.
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  3. #16
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    Quote Originally Posted by pilko View Post
    @ beenthere,
    Actually, I did not get a reply from post #6

    I can changed the time --- I have built and programmed my own control board.

    pilko
    I believe he means the "average guest" would have the probes to check temps to make the graphs you did.
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  4. #17
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    Quote Originally Posted by pilko View Post
    @ beenthere,
    Actually, I did not get a reply from post #6

    I can changed the time --- I have built and programmed my own control board.

    pilko
    So why would you want to shut off the indoor fan, and then make a timer to make it run in defrost even longer yet, using more electric for defrost? A bit counter productive to what you would want.
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  5. #18
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    Only the Thread starter, and pro members that have an * in their titles may post in a thread in the AOP forums.
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  6. #19
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    This is from the AOP forums rules.


    THE ONLY PEOPLE allowed to REPLY in the Owner Assistance Forums will be a Pro Member with a * by their user title and the one who started the thread. No others may post a reply.
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  7. #20
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    barbar.

    You have worn out your newb grace. If you continue to post in this thread, I will take action. And that action will cost you your posting privileges.
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  8. #21
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    In an attempt to settle the argument I have recorded a defrost at 1000 CFM and a second defrost at 500 CFM.

    Red = Discharge air temp From "A" coil
    Dark blue = Return air temp to "A" coil
    Green = Outdoor temp
    Light blue = Frost level on outdoor coil
    Attached Images Attached Images  

  9. #22
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    What did you use to measure the amount of frost on the coil?
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  10. #23
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    I designed the sensor myself. Have been using it for about 8 years.

    pilko

  11. #24
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    And it senses/measures how?

    Has anyone taken pressure and temp readings while its in defrost with the indoor fan running, and without the indoor fan running.

    Is that other guy comparing a unit designed/made to defrost without the fan running to your unit which is designed/made to defrost with the fan running.

    The Japanese brands are designed to shut off the fan, your Carrier isn't. With the indoor fan off, your compression ratio is higher the longer its in defrost then if the fan was running. So the compressor uses more electric during defrost, and will run in defrost longer.

    Keep in mind, that the COP in defrost is not as high as you were told it would be. Since the indoor coil isn't getting a full head of liquid. You can listen to the refrigerant flow, and hear the surging. The surging will be from vapor entering the indoor coil along with liquid during defrost.
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  12. #25
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    @ beenthere,
    thanks for the response.

    And it senses/measures how?
    sorry, cannot disclose that info.

    Has anyone taken pressure and temp readings while its in defrost with the indoor fan running, and without the indoor fan running.
    I have only taken air temp readings as per the chart at 1000 CFM and 500 CFM


    Is that other guy comparing a unit designed/made to defrost without the fan running to your unit which is designed/made to defrost with the fan running.
    I will ask

    pilko

  13. #26
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    So you may also be doing a lot of un-needed defrost then.
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