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  1. Replies
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    I want to learn more about refrigeration. Not a...

    I want to learn more about refrigeration. Not a licensed tech but I'm interested in this stuff. I like to study technical problems and their solution.

    Re "What other people think?", I just want to...
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    very interesting. Why the original 4T TXV...

    very interesting.

    Why the original 4T TXV (with proper charge refrigerant) seemed to be blocking the line (150 psi on one side and 0 the other side)? Should it cause 'flood' to the the compressor...
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    I kept thinking about this. Compressor flooded:...

    I kept thinking about this. Compressor flooded:
    a) bc it ingested liquid, or
    b) bc it cannot compress fast enough the volume of gas output by the Ecoil?

    (a) makes no sense because if 5 ton TXV...
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    They are similar in using close loop feedback...

    They are similar in using close loop feedback control.
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    On it, I had apologized.

    On it, I had apologized.
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    A typo in my previous post: "Thinking about in...

    A typo in my previous post:
    "Thinking about in the shower (I have warm water now), it occurred to me that the oscillation is totally because of the high gain of 5 ton TXV, but rather it's mostly...
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    "then can a smaller TXV be able to adjust its...

    "then can a smaller TXV be able to adjust its rate to match the bulb temperature feedback of a larger Ecoil? The injector has a wider operating range: from 0% to 100% duty cycle, and engine load...
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    Thinking about in the shower (I have warm water...

    Thinking about in the shower (I have warm water now), it occurred to me that the oscillation is totally because of the high gain of 5 ton TXV, but rather it's mostly due to the long delay from TXV to...
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    OK, a high gain (5 ton TXV) close loop system...

    OK, a high gain (5 ton TXV) close loop system causing oscillation. Thank you.
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    Sorry to be a pest, but a 5 ton TXV capable of...

    Sorry to be a pest, but a 5 ton TXV capable of close the valve to zero, then why it allows the bulb to be so warm and not react to the bulb feedback? If the 5 ton TXV cannot close to zero then it is...
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    Dad, Please allow me to have a question: an...

    Dad,

    Please allow me to have a question: an analogy between a larger Ecoil with matching larger TXV and smaller compressor and a larger engine with matching injectors and smaller fuel pump. "A...
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    It depends on how bad the mismatch are. Says...

    It depends on how bad the mismatch are.
    Says for a stock system: 50 psi pump and x rated injector having 50% duty cycle at 70 mpg speed
    Now someone switched out the x injector with a y rated...
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    Total agree on this. However in this case the OP...

    Total agree on this. However in this case the OP said "I will say system is a 3 ton condenser with 5 ton Evap coil with 3 ton TXV", then we have to live with a mismatch between Ecoil and condenser....
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    But all of these B,C,D,E parts ended up at the...

    But all of these B,C,D,E parts ended up at the final Ecoil temperature where the TXV picked up as a feedback for metering the refrigerant. It is like regardless the fuel hose diameter, fuel pump...
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    "Yes, it should be sized to the condenser." ...

    "Yes, it should be sized to the condenser."

    TXV should be sized for Ecoil, not condenser.

    The season: TXV feedback bulb senses the temperature at the exit end of the Ecoil for metering the...
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    Even if there's restriction in condensing unit,...

    Even if there's restriction in condensing unit, with nothing to compress (LL = 0psi) the motor not necessary drawing high amp.
    It would be interesting to see what pressure in the condensing unit.
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    RLA = 7.3A? I think OP meant Running Amp...

    RLA = 7.3A?
    I think OP meant Running Amp instead of RLA (Rated Load Amp). RLA is the minimum current the installed electrical circuit can handle before damaged (one cannot measure RLA but read it...
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    This is why the highest court in the land has 9...

    This is why the highest court in the land has 9 members and not just one.
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    Do you have an explanation of why the 150 psi...

    Do you have an explanation of why the 150 psi liquid line did not decrease while the suction line was zero? Due to 150 was not high enough to overcome the TXV threshold?
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    "One reason the high side 150 unchanged when...

    "One reason the high side 150 unchanged when compressor running: a restriction somewhere from condenser to liquid line."
    So why this was so wrong if it came from me?
    I got it: he went to HVAC...
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    Sine the OP stated the E-coil TXV has bypass...

    Sine the OP stated the E-coil TXV has bypass valve (for heat cycle I think), then does this unit have 2 or just 1 TXV? The 2nd TXV if blocked could be the source of the issue leading to 150 psi...
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    From this member: "f you have a full charge and...

    From this member: "f you have a full charge and 150 psi at liquid service valve, amp draw will be high and restriction is in condensing unit."
    So he is OK but mine are ramblings?
  23. Replies
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    One reason the high side 150 unchanged when...

    One reason the high side 150 unchanged when compressor running: a restriction somewhere from condenser to liquid line. You need to prove that N2 flows freely from condenser input to liquid line...
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    Maybe the fixed orifice is too small. Replaced a...

    Maybe the fixed orifice is too small. Replaced a restricted TXV with an unknown opening fixed orifice is just a trial error, which does not warrant a change in the right direction. What if a larger...
  25. For those, they think money is just an exchange...

    For those, they think money is just an exchange medium and carry less real value than a healthy planet. You can't print the earth as money.
  26. Replies
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    Come on, one doesn't have to go to HVAC school to...

    Come on, one doesn't have to go to HVAC school to learn about Conservation of Mass. If the compressor pulled in all the vapor gas from the low side, where do these compressed vapor gas goto -- into...
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    ...and minimum waste to landfill. Even only...

    ...and minimum waste to landfill.

    Even only for 3 units, I bought roll of non-metal flex conduit and connectors and made my own whips.
  28. Replies
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    Sorry but let’s think again. In a normal running...

    Sorry but let’s think again. In a normal running system the total refrigerant mass is divided Into low and high side plumbing, and so with a restriction within the evaporator for example, then all of...
  29. Re energy storage, this should work in theory but...

    Re energy storage, this should work in theory but the system is a complex and high maintainence cost.

    Why not using all of the readily available electric cars batteries around the country for...
  30. I don't totally blame the politicians; they are...

    I don't totally blame the politicians; they are pressured by the voters put them in offices. Until the majority of voters understand the PROs out weights the CONs then we make progresses. We easily...
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    410a saturated at 150 PSIG & 53F. But in this...

    410a saturated at 150 PSIG & 53F. But in this case its temperature was held at 65F by ambient due to restriction, and so it's in super heated state and might not be due to incorrect charged.
  32. But why the noise if Running on SC?

    But why the noise if Running on SC?
  33. Still noisy spinning without load means it needs...

    Still noisy spinning without load means it needs rebuilt or replaced. But then I don’t expect it to spin freely and smoothly by hand with noise.
  34. When engaged, do you mean motor already spinning...

    When engaged, do you mean motor already spinning and turning the load? Try to differentiate stalled noise (S cap related) of spinning noise which could just mean gear train locked up creating heavy...
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    As a 13 years old I was trouble shooting a 220v...

    As a 13 years old I was trouble shooting a 220v light bulb socket. The bulb socket was the kind that had 2 spring loaded contacts for bayonet bulb base. After 5 minutes checking the voltage on the 2...
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    You enjoyed too much beef; high in iron. I...

    You enjoyed too much beef; high in iron. I wouldn't feel a thing on 24v unless using tongue.
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    240v single phase is more efficient but also more...

    240v single phase is more efficient but also more dangerous.
  38. Replies
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    The statistic because people exposed to 120v more...

    The statistic because people exposed to 120v more than 240v or higher. It's not because 120 is more dangerous than 240.
    Same body part under 240v gets more current flow than when under 120v. Then...
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    I think 120v was used in US because it is safer...

    I think 120v was used in US because it is safer than 240v. One would die by the high voltage before the fingers were vaporized.

    I once almost lost my index finger trying to jump start a dual V8...
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    I'm 5'8" 135 lbs in 1990 and my boss said I will...

    I'm 5'8" 135 lbs in 1990 and my boss said I will be 150 lbs in 10 years. 132 lbs this morning.

    I enjoy eating any kind of foods that I like. I don't like soft drink, processed foods, junk foods....
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    Torque wrench on line set flare nuts and service...

    Torque wrench on line set flare nuts and service valve caps.
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    For low voltage as 24v, you can use alligator...

    For low voltage as 24v, you can use alligator clip or clothespin to hold the wires at one end and hold the other end with fingers to measure current.

    Amp clamp is for measuring high current. The...
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    Higher ohms circuit uses less current and will...

    Higher ohms circuit uses less current and will not hurt the transformer. I think you were thinking the other way.
    Lower resistance, i.e., 5 Ohms will burn the transformer because 24v / 5 ohms =...
  44. Does it have a metal conduit served as equipment...

    Does it have a metal conduit served as equipment grounding?
  45. Please point out if I was wrong. Thank you.

    Please point out if I was wrong. Thank you.
  46. Replies
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    I'm not here to argue; I'm here to learn and...

    I'm not here to argue; I'm here to learn and share. The fact is the OP didn't say the com has SC or not and Goodman schematics show a SC as an option installed by factory. What if there was a SC...
  47. If a flexible metal conduit is used as ground (no...

    If a flexible metal conduit is used as ground (no ground conductor in the conduit) then the conduit is limited to 6' max and must be connected with listed (approved) fittings, regardless it's Seal...
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    We all don’t know because the OP didn’t say the...

    We all don’t know because the OP didn’t say the part number, but it could have a SC because most Goodman wiring diagrams show The SC and relay as option.
  49. I can't think of a situation that any appliances...

    I can't think of a situation that any appliances with metal enclosure that has 240v circuit inside that not require a ground conductor for grounding the equipment, regardless if it is on the roof or...
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    I fully understand the functions of run and start...

    I fully understand the functions of run and start caps. How do you know so sure that the said compressor has no starting cap that it needs the assistance of the hard start kit? The OP did not...
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