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  1. Replies
    8
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    149

    Thatís close to rule of thumb sizing. Which is...

    Thatís close to rule of thumb sizing. Which is wrong.
    Equipment can use excessive energy. And not perform well. Plus not be as reliable as it should be.
  2. Replies
    8
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    154

    How did you come into ownership of this Sharp...

    How did you come into ownership of this Sharp unit?
    Did you find it on the internet?
    Who installed it?
    What does Sharp have to say about the issues?
  3. Replies
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    216

    I’ve had about a 92% failure rate with the Nest...

    I’ve had about a 92% failure rate with the Nest thermostat in the ones I’ve encountered in the field.
    Not that it’s positively your current issue.
  4. Replies
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    180

    Your not looking to put the largest outdoor unit...

    Your not looking to put the largest outdoor unit possible.
    Your not looking to buy the largest outdoor unit possible.
    Demand an accurate manual J be done for sizing.

    www.loadcalc.net

    The...
  5. Replies
    6
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    157

    What advice does your service technician have to...

    What advice does your service technician have to to fix the issue?
    Pressure alone doesnít mean very much.
  6. Replies
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    199

    Is the installing contractor unwilling to...

    Is the installing contractor unwilling to fabricate a transition?
  7. The freezing is abnormal. Charge may be wrong. ...

    The freezing is abnormal. Charge may be wrong.
    Lack of proper evacuation will kill the unit.
  8. Replies
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    264

    Get a second opinion. It doesn’t sound like that...

    Get a second opinion. It doesn’t sound like that tech is interested in fixing anything.
  9. Replies
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    253

    Iíve never witnessed a PTAC that incorporates a...

    Iíve never witnessed a PTAC that incorporates a gas furnace.
    What kind of heat do you have now?
  10. Replies
    11
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    289

    Likely oversized equipment, undersized duct, or a...

    Likely oversized equipment, undersized duct, or a combination of both.
    Your duct will have to be modified to accommodate 5 tons of airflow, or smaller equipment installed.
    How was 5 tons...
  11. Actually, the OPs description indicates a very...

    Actually, the OPs description indicates a very large possibility that the equipment is oversized even for daytime load.
    The sizing per square foot is extreme here, to say the least.
  12. Replies
    6
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    277

    Sorry, but you posted on a site that doesn’t...

    Sorry, but you posted on a site that doesn’t allow DIY instruction. Per the bright red banner at the top of the page.
    I’d say just wait it out till tomorrow.
  13. Again, your unit is displaying every sign of...

    Again, your unit is displaying every sign of oversizing.
    Running the blower constantly will increase humidity more.
    You likely need smaller equipment.
  14. It sounds like an oversized units behavior.

    It sounds like an oversized units behavior.
  15. Replies
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    219

    I’ve heard of DIYers mentioning that brand, but...

    I’ve heard of DIYers mentioning that brand, but in 18 years I’ve never seen nor worked on one.
  16. Replies
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    219

    This is why itís ill advised to order your own...

    This is why itís ill advised to order your own equipment. Your left with a brand new system of unknown quality with no support and possibly no warranty.
    Iíd say your best bet right now is to bring...
  17. Thread: Control boards

    by rider77
    Replies
    13
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    287

    You could have asked him to temporarily wire it...

    You could have asked him to temporarily wire it to allow for cooling operation, if possible.
    We are unable to instruct you how to do it yourself. Per the site rules.
  18. Thread: Control boards

    by rider77
    Replies
    13
    Views
    287

    Let him return with the part and do his thing....

    Let him return with the part and do his thing. Just make sure he tests the equipment before leaving.
  19. Thread: Control boards

    by rider77
    Replies
    13
    Views
    287

    What does your service technician suggest to fix...

    What does your service technician suggest to fix the problem?
  20. Replies
    5
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    179

    Do not use those restrictive allergy filters. ...

    Do not use those restrictive allergy filters.
    The purpose of the filter is not to be a whole house air cleaner. It’s to prevent dirt build up in the equipment.
  21. Replies
    11
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    236

    I would not operate it like that. Without a...

    I would not operate it like that. Without a professional looking things over and giving the ok.
  22. Manual J takes that into account. Sizing isn’t an...

    Manual J takes that into account. Sizing isn’t an estimation or opinion. It’s a detailed calculation.
  23. Replies
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    265

    Brand doesn’t much matter- ...

    Brand doesn’t much matter-

    https://www.angieslist.com/articles/difference-between-best-hvac-brands.htm

    It is of high importance that the unit is sized correctly-
    ...
  24. Replies
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    236

    Could cause backdraft issues for other fuel...

    Could cause backdraft issues for other fuel burning appliances in the area. Could cause freeze ups if the blower is downstream of the coil.
  25. Sizing isn’t done via square footage. Basements...

    Sizing isn’t done via square footage.
    Basements often only need dehumidification and a small amount of heat. And shouldn’t be on the main hvac system.
  26. You have 3.5 tons for a 2,000 square foot well...

    You have 3.5 tons for a 2,000 square foot well insulated house in Canada?
    I’d say you have oversized equipment.
  27. Thread: What to buy?

    by rider77
    Replies
    5
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    205

    There is no such thing as a best brand. The...

    There is no such thing as a best brand.
    The installer means the most when it comes to the outcome.
    Please remove your pricing. It’s against site rules.
  28. There is a contractor locator map here on the...

    There is a contractor locator map here on the site that includes the volunteers here.
    Maybe see if someone is in your area that can help.
  29. Please note the bright red banner at the top of...

    Please note the bright red banner at the top of the page. We cannot assist in DIY instruction here.
  30. Replies
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    205

    Should come on with the outdoor fan.

    Should come on with the outdoor fan.
  31. Dave was this a furnace you bought and installed...

    Dave was this a furnace you bought and installed yourself?
  32. What does the installing company/technician have...

    What does the installing company/technician have to say about the problem?
  33. Replies
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    254

    Could be old ceiling radiant electric heaters.

    Could be old ceiling radiant electric heaters.
  34. No, this would not help the problem your...

    No, this would not help the problem your experiencing.
  35. Replies
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    230

    What motor is your service technician suggesting?

    What motor is your service technician suggesting?
  36. Replies
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    332

    The sticker on the unit that most miss says “up...

    The sticker on the unit that most miss says “up to” before giving a seer number.
    The AHRI match number will show the true efficiency and capacity ratings.
    Mismatched equipment true efficiency and...
  37. If I remember correctly R-407C has a capacity...

    If I remember correctly R-407C has a capacity loss when compared to R22.
  38. Replies
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    321

    You’ll likely going to have to hire an...

    You’ll likely going to have to hire an engineering service to do them.
    What’s your current static and CFM?
  39. Replies
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    321

    There is no such rule of thumb

    There is no such rule of thumb
  40. Replies
    14
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    321

    You don’t have anywhere near enough duct for your...

    You don’t have anywhere near enough duct for your proposed new unit.
    In fact, you don’t have enough duct for your existing unit. Which may be causing your poor performance.
    Do not, under any...
  41. Replies
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    486

    Sounds like a sizing and possible duct issue. ...

    Sounds like a sizing and possible duct issue.
    Ideally you should never “feel” the air flowing around the house while the systems running.
  42. Replies
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    234

    Do you have a packaged unit or split system? Is...

    Do you have a packaged unit or split system?
    Is it located in the attic or on the roof?
  43. Replies
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    243

    The cheap no name units sold on the internet are...

    The cheap no name units sold on the internet are usually just cheap disposable knockoffs that may last a couple years and need replacement. Their performance reflects on the price paid-cheap.
  44. Replies
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    486

    Hire the installer. Not the brand. The hands...

    Hire the installer. Not the brand.
    The hands working on the equipment, means a lot more then brand name.
    Brand means almost nothing.
  45. Running the fan all the time can increase indoor...

    Running the fan all the time can increase indoor humidity.
  46. Replies
    12
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    281

    That’s a 3.5 ton unit. Capacitors aren’t sized...

    That’s a 3.5 ton unit.
    Capacitors aren’t sized via tonnage. Compressors and motors are specific to what their capacitor requirements are.
    A compressor tonnage difference with the outdoor unit...
  47. Replies
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    438

    Goodway has several options that would probably...

    Goodway has several options that would probably work. Some will require a separate water supply.
  48. Not wise to assume it was sized correctly. Most...

    Not wise to assume it was sized correctly. Most are not.
    How often does the unit run in a very hot day?
  49. Replies
    5
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    213

    Sorry, but we can’t offer DIY instruction here. ...

    Sorry, but we can’t offer DIY instruction here.
    Not wise to try repairs without the proper tools.
  50. Replies
    5
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    213

    Don’t think you have the right amount in? Are...

    Don’t think you have the right amount in?
    Are you not using a scale?
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