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  1. Replies
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    When I size equipment properly it NEEDS to run...

    When I size equipment properly it NEEDS to run during peak load conditions. I do not want a smart grid or smart thermostat interfering with my designed operation.

    For those who are not my...
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    Check the links in my sig to find good...

    Check the links in my sig to find good contractors.
  3. Replies
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    Under a year since installation. It should be...

    Under a year since installation. It should be covered by their installation warranty.
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    Nest sucks. Choose a different thermostat. ...

    Nest sucks. Choose a different thermostat.

    Prices are not allowed.
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    Sure they are. They were the lowest bidder, so...

    Sure they are. They were the lowest bidder, so they’re still driving the same truck, too. :angel:
  6. There are some pumps that have two parts, a...

    There are some pumps that have two parts, a sensor and a pump. I don’t know if they will fit in a ceiling cassette.
  7. From your description, the home inspection was a...

    From your description, the home inspection was a dog and pony show, no substance. There’s no point to making expensive improvements if they don’t address the problems. To borrow a phrase from the...
  8. It is possible for the machinery to be working...

    It is possible for the machinery to be working properly but for the distribution system to be undersized or leaky. Or for the apartment to itself to be leaky {not the same as under-insulated.)
    You...
  9. Except for cleaning filters, these units are not...

    Except for cleaning filters, these units are not intended for owner service. I recommend calling for a visit by a service tech.
  10. Why has the company that tried to remove it not...

    Why has the company that tried to remove it not been held responsible? They should fix it or pay to have it fixed.
  11. Other links for techs in my sig.

    Other links for techs in my sig.
  12. STOP! The "diagnosis" sounds like a scare tactic...

    STOP! The "diagnosis" sounds like a scare tactic to make a sale. He has succeeded in scaring you. Hire a technician who has been trained in combustion analysis and carbon monoxide to actually test...
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    All the heat from the lower level will go to the...

    All the heat from the lower level will go to the upper level.
    Are any of the contractors using a load calculation for their recommendations? They might guess right but YOU have to live with the...
  14. I notice several things, any one or several...

    I notice several things, any one or several things could be factors in the problem. Air flow and static pressure should be measured. Blower speed should be verified.
    Then some information from the...
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    #1. Nest sucks. Do yourself a favor and cross it...

    #1. Nest sucks. Do yourself a favor and cross it off the list.
    #2. 4 conductors for ION. 6 or 8 needed for Ecobee.
    #3. Communicating equipment works best with communicating controls. If you don't...
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    Normal standard is 75 indoors at outdoor design...

    Normal standard is 75 indoors at outdoor design temperature. If, and that's an important thing, if you're at outdoor design temperature, the heat pump SHOULD be running almost constantly. Long cycles...
  17. Thread: Vacuum Pumps

    by kdean1
    Replies
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    2,294

    It depends on how wet the system is. I followed...

    It depends on how wet the system is. I followed someone on a vounteer project after they had brazed the lines. The oil looked like milk after a couple of minutes. I changed oil 5 times or more. I...
  18. Thread: Vacuum Pumps

    by kdean1
    Replies
    86
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    2,294

    Your entire rig is important. Do NOT evacuate...

    Your entire rig is important. Do NOT evacuate through a manifold. Use 3/8" or 1/2" vacuum rated hoses, Appion or Trublue are outstanding. Removing valve cores will speed up evacuation enormously....
  19. Google dew point. You MUST avoid reaching dew...

    Google dew point. You MUST avoid reaching dew point inside the walls.
  20. Just because the fan has a 4" collar does not...

    Just because the fan has a 4" collar does not mean that 4" duct is the right size. Length and turns on the duct increase resistance and may limit air flow. It is not uncommon to have better...
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    1. Bigger equipment is not better, it's worse....

    1. Bigger equipment is not better, it's worse.
    2. AIRFLOW! 20x20 is too small even for a smaller furnace.
    3. Load calculation? How was size selected? Square footage is the wrong answer.
  22. What is the original ceiling height? I'm inclined...

    What is the original ceiling height? I'm inclined to agree with you but don't want the ceiling too low.
  23. Replies
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    Be less concerned about WHAT the speeds are and...

    Be less concerned about WHAT the speeds are and more concerned about the AIR FLOW and temperature rise.
    Why has your contractor not answered the question?
  24. I just noticed the electric air purifier gadget...

    I just noticed the electric air purifier gadget in your picture. I suggest you investigate the reported problems these things pose. Then get rid of it. ...
  25. I wasn’t aware that air conditioners have a...

    I wasn’t aware that air conditioners have a defrost cycle.
  26. Replies
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    This appears that you are replacing the motor...

    This appears that you are replacing the motor yourself. Site rules prohibit giving technical advice for DIY.
  27. Replies
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    I replaced an Ecobee this week that had constant...

    I replaced an Ecobee this week that had constant 17V output on Y1, even when the stat was set to off. New stat, no more frozen evaporator.
  28. A blower wheel that is not perfectly clean will...

    A blower wheel that is not perfectly clean will reduce air flow significantly and give low static pressure readings.
    There are a couple more links in my sig for finding skilled contractors.
  29. Side of the house. Though it will fit under the...

    Side of the house. Though it will fit under the deck, it is likely to work harder if the heat does not dissipate completely.
  30. Ideally, the return ducts should be .1" WC;...

    Ideally, the return ducts should be .1" WC; supply ducts .1" WC; coil could be from .2" to .3" depending on wet or dry and the model. That leaves only .1" for the filter.

    Here's a link with some...
  31. I have had customers change from MERV 11 to MERV...

    I have had customers change from MERV 11 to MERV 8 to reduce noise and reduce pressure drop. I find most high efficiency filters to be restrictive, with just the following exception.
    I removed my...
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    Any contractor should be able to sell you a...

    Any contractor should be able to sell you a couple. Or see about a nearby supply house.
  33. Replies
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    The ONLY way to know is to measure static...

    The ONLY way to know is to measure static pressure. The equipment has a specification on it stating the maximum ESP (external static pressure) recommendation. Aprilaire does make great filters but so...
  34. How is it that you are listed as a professional...

    How is it that you are listed as a professional member on the site? You seem to have a better grasp of this information than some who post frequently (usually asking for help on basic things).
  35. With this sort of content, doesn't this thread...

    With this sort of content, doesn't this thread belong in the tech-to-tech forum instead of AOP?
  36. Pictures? What combustion appliances are in the...

    Pictures? What combustion appliances are in the room?
  37. Replies
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    More information is needed. Are these coils in...

    More information is needed. Are these coils in your house? Are there any corrosive chemicals, VOCs? I have heard that Chinese drywall used in the Midwest contributed to chemicals in the air which...
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    Ask an HVAC contractor to measure static...

    Ask an HVAC contractor to measure static pressure. All that flex duct going in all directions concerns me.
  39. Get a technician who is willing to do more than a...

    Get a technician who is willing to do more than a gas-n-go. But a repair will cost more than just “topping it off.”
    BTW, that’s not a technical term. We charge refrigerant by pressures,...
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    Mitsubishi says says dry mode is cooling all the...

    Mitsubishi says says dry mode is cooling all the time, no temperature control. You’ll notice the display on the remote turns the numbers off in dry mode mode. It will never cycle off on temperature.
  41. OP, as an equipment owner or manager you can do...

    OP, as an equipment owner or manager you can do anything you want to the equipment. We just won’t help you f*** it up.
  42. I say he’s a homeowner. No tech would use this...

    I say he’s a homeowner. No tech would use this terminology “a sort of new forced hot air system”. His description displays ignorance of the components and their function.

    He is purposely avoiding...
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    Chances are your air conditioner is oversized,...

    Chances are your air conditioner is oversized, which is common.

    Are your furnace and water heater gas? From your description of them in a closet, I would be concerned about lack adequate...
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    Air conditioners are designed to MAINTAIN a...

    Air conditioners are designed to MAINTAIN a temperature, not to LOWER It. Try setting it for the temperate you want and leaving it there.
    Machines do not need to “rest.”
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    No. The fin spacing is different for mobile home...

    No. The fin spacing is different for mobile home coils because of the small ducts and higher velocity over the coil. There's a good chance water will blow off the coil and you'll be dealing with...
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    Get the Navac NEF6LM battery flaring tools. It is...

    Get the Navac NEF6LM battery flaring tools. It is easier to use than the earlier model, and less expensive.
    I use Nylog on flare faces and the back of flare nuts.
  47. Replies
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    He’s giving you a snow job. High static pressure...

    He’s giving you a snow job. High static pressure will cause motor failure. Is he covering labor for 10 years or will he bill you for motor replacements in years 2,3,4,5,6,7,8,9,and 10?
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    Thanks for the information. What should I do with...

    Thanks for the information. What should I do with it?
  49. It appears you intend to replace this yourself. I...

    It appears you intend to replace this yourself. I wish you well but you're on your own.
    This site does not permit giving advice for DIY, as stated in the rules and at the top of the post.
  50. Replies
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    From an authoritative reply on the Green Building...

    From an authoritative reply on the Green Building Advisor site-
    "1% cooling, means 1% of the time it has been hotter historically (over something like the last 25-50 years). There are 8760 hours in...
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