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Type: Posts; User: lynn comstock

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    The latest image I see is Post 115. As Drawn, I...

    The latest image I see is Post 115.
    As Drawn, I would expect any liquid in bottle 1 t freely drain into bottle 2 until it was liquid full. In this case bottle 2 is simply an extension of the...
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    Video link failed. Being in a brazed joint, the...

    Video link failed. Being in a brazed joint, the leak could easily be a manufacturing defect. I have created a few defects myself. :angel:
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    Bottle 2 is essentially an enlargement of the...

    Bottle 2 is essentially an enlargement of the liquid line and will always be liquid full by gravity as drawn, below the liquid level maintained in the condenser (bottle 1).

    If you construct...
  4. From article at...

    From article at http://www.achrnews.com/articles/104661-troubling-pinhole-leaks-in-evaporator-coils-cause-corrosion-issues 6-7-2007

    "Formicary corrosion has been common on R-22 systems for over a...
  5. My thoughts were limited to the application. The...

    My thoughts were limited to the application.
    The environment of the evaporator coil is much more aluminum friendly than salt water. Sorry bout that.
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    Deepen the trap. Buyer beware.

    Deepen the trap.
    Buyer beware.
  7. We will know in 20 years. Aluminum has the best...

    We will know in 20 years.
    Aluminum has the best track record at this point.
    Aluminum corrosion is self healing. It is invisible and one molecule thick.
  8. So, you are already making manual seasonal...

    So, you are already making manual seasonal adjustments. That will not change with the smaller furnace or 2 stage furnace.
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    Polyurethane foam in a can and paint it. Super...

    Polyurethane foam in a can and paint it. Super sticky stuff. Most any hardware store has it.
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    Andy, Your atavar (or self portrait?) could use a...

    Andy, Your atavar (or self portrait?) could use a smile.:)
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    Is your P trap a running trap? The air...

    Is your P trap a running trap?

    The air handler cabinet is in a vacuum created by the indoor fan. It is the FAN stopping that allows the water to drain.

    Install a true P trap that has enough...
  12. Is the basement heated and cooled as a part of...

    Is the basement heated and cooled as a part of the 3500 sq ft living space?
    They agree on AC sizing. Good. Did anyone do a heat load calculation?

    Do you see any comfort reason to change your...
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    That reminds me:

    Back in the day, our company converted an R12 AC to R22 by replacing the condensing unit and TXV. It didn't work well. It was flooding severely and the valve adjustment didn't change a thing.
    ...
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    Over sizing and cycling wastes energy and money....

    Over sizing and cycling wastes energy and money.
    Help save the planet. :grin2:
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    Back in the dark ages, we bought R12 and R22 in...

    Back in the dark ages, we bought R12 and R22 in 125# drums about five feet tall with vapor only valves on top. We inverted the drums on a home made rack that protected the valve and refilled our...
  16. Sounds good to me.

    Sounds good to me.
  17. You may want to consider replacing the air...

    You may want to consider replacing the air handler as an option. While it is out, the return and supply ductwork can be inspected and cleaned more effectively than if the air handler is present.
    ...
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    Data collection

    I created a spreadsheet to analyze the data collected on every service invoice. I did not include ID RH as that is a non-factor in AZ. I have attached the form. The data block and some system...
  19. The supply air ductwork is oversized for a 4 ton....

    The supply air ductwork is oversized for a 4 ton. (Not a capacity problem) Is this a rooftop packaged unit installation? The return duct system may be a problem.

    A simple test: cover the...
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    Did it work?

    Did it work?
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    See the definition below: "where energy is...

    See the definition below: "where energy is transferred only as work." Perhaps Andy can explain how this happens in the operating receiver's when the receiver physical volume is a constant. I think...
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    The PV explanation must agree with molecular behavior in an operating receiver

    In Post #37 I tried to explain origin and sustaining of the vapor above the vapor-liquid interface in a receiver, at a molecular level, in an operating system. Rather than using a mathematical...
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    That is around 10 cubic feet. The size of the...

    That is around 10 cubic feet. The size of the expansion tanks and their air cushion should be considered. Mistakes and shortcuts happen.
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    Safety concern:

    With the makeup valve setup that you describe, there also must be a check valve in each makeup to prevent system water from ever backflowing and contaminating the domestic water supply
  25. I think your high temperature drop out of the...

    I think your high temperature drop out of the second plenum is due to low velocity caused by the high pressure drops that are the result of the duct system design.
    OR it may be that the ID fan is...
  26. A mistake will damage the coil inside. Too big a...

    A mistake will damage the coil inside. Too big a risk, even if the drill penetration is limited to 1/16th of an inch.
  27. As long as you bench drill the hole.

    As long as you bench drill the hole.
  28. Probably not. I liked using a bead of cheap,...

    Probably not. I liked using a bead of cheap, latex calking for sealing access doors. It seals well and strips off clean when you access the doors. Looks good too. Washes off your hands, easily, with...
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    I take it the third pump is a backup pump for a...

    I take it the third pump is a backup pump for a single water circuit.
  30. Does the new system work better, worse or about...

    Does the new system work better, worse or about the same as your prior system?

    You did not indicate what the attic insulation is. Increasing the attic insulation, if possible is always a good...
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    Do you know about subcooling and superheat? There...

    Do you know about subcooling and superheat? There is no substitute for knowledge.
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    Or they may install an auxiliary drier outside at...

    Or they may install an auxiliary drier outside at the condenser. I have seen 3 LLFD's on a single unit (including the little one inside of the condenser cabinet.)
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    Why is there ANY vapor above the subcooled refrigerant in a receiver?

    So then, where does the vapor come from that fills the space over the liquid in the receiver of an operating system.

    I postulate that this vapor comes from the most energetic random molecules...
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    The Headmaster is not a part of the simple...

    The Headmaster is not a part of the simple refrigeration cycle with a receiver.

    Doesn't the Headmaster function to drive inactive (stored) liquid refrigerant out of the receiver so that it "backs...
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    Somehow I think the specific heat of the liquid...

    Somehow I think the specific heat of the liquid will dominate the shell of the receiver and at least partially mask any temperature difference.
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    Your thinking seems very close to mine. Do you...

    Your thinking seems very close to mine. Do you agree with my expanded notes? The source of the vapor is the subcooled liquid. The energy to "vaporize" it comes from the kinetic energy of the...
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    Good article, but the link only brought up page 1...

    Good article, but the link only brought up page 1 to view. I googled "Subcooling, but Correctly" to view the entire article.
    Lots of good material, my best takeaway is:
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    Because of the complexity of the argument, I...

    Because of the complexity of the argument, I commented on the details in Red.
  39. Living with a deluge of Immigration

    Social services are a big business in Yuma, AZ. Immigrants, in poverty by USA standards, live very well compared to the poverty across the border a few miles away. Social services subsidize workers...
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    Local weather forecast: (Captured on line using...

    Local weather forecast: (Captured on line using Microsoft snipit tool, that allows you to capture all or any part of the screen on your computer. I recommend it. It is not easy to find, google it.)
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    Jerk? I can believe that. :yes:

    Jerk? I can believe that. :yes:
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    I have a half formed idea that the source of the...

    I have a half formed idea that the source of the higher temperature vapor above the subcooled liquid is not vapor entrained in the liquid coming from the condenser, especially as subcooling may need...
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    Look at the left side of the extended performance...

    Look at the left side of the extended performance chart.:grin2:
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    I don't know. The principle stands, though. A TXV...

    I don't know. The principle stands, though. A TXV is a variable orifice which limits flow to prevent overfeeding the evaporator coil when the heat load is low and opens wider when the heat load is...
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    I hope you can access the extended system...

    I hope you can access the extended system performance chart to confirm what I see on the chart. (Post 214...converted to GIF format.)
  46. Thoughts:

    Odors originating in the evaporator or ductwork will concentrate during an off cycle and be most noticeable when the system first turns on.
    Smells like plastic, melted plastic? I don't know. Many...
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    Andy, I know you know this, but don't give up: ...

    Andy, I know you know this, but don't give up:
    The P/T chart only applies only when the liquid and its own vapor are in contact with one another in STABILITY or equilibrium (at the same temperature...
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    The gauges and the P/T chart are your window into the evaporator and condenser.

    Water is also a refrigerant #718. Its use is limited because it turns into a solid at 32 deg. F. However, the steam table and saturation curves look like the diagram in post #221. The explanation of...
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    Good questions. The performance chart is heat...

    Good questions.
    The performance chart is heat load dependent, and part of the total heat is hidden in the water vapor contained in the air.
    The PT chart applies to the refrigerant contained in a...
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    I don't know how to chart what I have witnessed twice.

    On 2 occasions over a long career and thousands of systems, I witnessed refrigerant flooding so severe and out of control that there was heavy frost on the DISCHARGE line.
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