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  1. Replies
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    Wow! Turning off JavaScript worked like a champ!...

    Wow! Turning off JavaScript worked like a champ!
    It was so damn annoying I was not really using the site anymore because it would freeze and load pages sooooo slow. Without script it's back to...
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    2,169

    All I can say is 100% deposit, including labor...

    All I can say is 100% deposit, including labor and misc materials.

    If the homeowner was willing to pay for the repair why would 2 other contractors walk away?

    9 times out of 10 the customer is...
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    Why not just replace the air handler?

    Why not just replace the air handler?
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    972

    Circulation systems can be configured in many...

    Circulation systems can be configured in many ways. Switches, motion sensors , timers, etc.

    The explanation of you're troubles leads me to believe there is a great misconception of how the unit...
  5. When did Testo fix the 550's static discharge issue?

    Was there a model date range when they improved the circuitry to help protect against static discharge damage, or do they still need a grounding clamp?
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    I have the otterbox on my iPhone 6, so I bought...

    I have the otterbox on my iPhone 6, so I bought this kit with the extension.
    http://www.tequipment.net/FLIR/One-iOS-KIT/Building-and-Industrial-Thermal-Imagers/
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    Last week I ordered a Flir One for iOS from...

    Last week I ordered a Flir One for iOS from Tequipment and it was at my door the very next day.
    I figured it was a good way to break into the thermal camera world.

    I have to say I'm shocked that...
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    If you're using 1 as a multiplier in your...

    If you're using 1 as a multiplier in your sensible heat calc, your ADCF would be 0.926.

    Question is, why are you using ~100°-110° air, at a specific volume of 14.4?

    Are you saying the supply...
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    Note: When measured separately, current is not...

    Note:
    When measured separately, current is not linear in regards to power due to power factor change when load is increased or decreased.
    Reactive power does no work. Higher static = low load = low...
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    That looks good to me. Sp2 = Sp1 x (CFM2/CFM1)˛ ...

    That looks good to me.
    Sp2 = Sp1 x (CFM2/CFM1)˛ is the same as Sp2/Sp1 = (CFM2/CFM1)˛

    You're just multiplying both sides by Sp1.
    You can derrivate the formula any way you wish as long as you...
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    896

    Is this the one you're talking about? dp1 /...

    Is this the one you're talking about?

    dp1 / dp2 = (n1 / n2)˛ (d1 / d2)˛


    http://www.engineeringtoolbox.com/fan-affinity-laws-d_196.html

    This has to do with the rpm of the wheel though.
    I...
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    1,443

    No worries my friend, you can put me on the spot....

    No worries my friend, you can put me on the spot. Sometimes things change and we need to rethink certain product lines.

    I haven't worked on the furnaces. So I cannot comment, but the AC/heat pump...
  13. Replies
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    1,443

    The Ameristar equipment is nothing like...

    The Ameristar equipment is nothing like Trane/American standard. Not sure where you are coming up with this comparison.

    They're more along the lines of Coleman, or an outdated version of Bryant.
    ...
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    I'm thinking along these lines.

    I'm thinking along these lines.
  15. Replies
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    992

    Ok, I see you've multiplied the density with the...

    Ok, I see you've multiplied the density with the specific heat of air to get .018.
  16. Replies
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    992

    Just a question, shouldn't you be using constant...

    Just a question, shouldn't you be using constant pressure Cp 0.24 instead of constant volume for the specific heat of air?
    Actually, Cv would be .17, why is yours .018.

    For starters your cfm...
  17. The silver side is used for a vapor retarder and...

    The silver side is used for a vapor retarder and radiant heat shield. On a return in a conditioned space, I wouldn't be too concerned with either. So, flipping it with the foil side in is fine. Just...
  18. I have to laugh, I remember finding a house...

    I have to laugh, I remember finding a house flipper had replaced the PRV with an expansion tank on a cast iron boiler. He wanted me to start it up and test it out.

    To answer the question though,...
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    X2 With the exception of never too much air...

    X2

    With the exception of never too much air flow. A lot of mfg's install 1/3hp blowers in their smallest furnace. With a 1.5-2 ton match up its usually way too much air flow. A high static...
  20. Nope, 940, or zone sensor. A 2nd 950 will cause...

    Nope, 940, or zone sensor. A 2nd 950 will cause confusion with the communication. As the 1st 950 is the main controller. There's no way to tell it to be a slave at this point. I agree, they should...
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    By the time you charge for the research, travel...

    By the time you charge for the research, travel time, wire cost, and labor, you might as well just order a new heat kit. Not to mention the customer will have a much longer part warranty, and you...
  22. Replies
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    2,288

    Drills are very important for service and...

    Drills are very important for service and install. I would get both mini 12v impact and the larger 18v hammer drill. Whatever brand is fine.
    I have the Makita 10.8v/12vmax impact/ LED flash light...
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    1,576

    Remove the DF board, flip it over. Grab your...

    Remove the DF board, flip it over. Grab your soldering iron and repair the cold solder joint behind the CC terminals.

    If it's not that, you may have two loads in series, which again would lead to...
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    Why do people get so upset when they are asked to...

    Why do people get so upset when they are asked to follow a procedure for help?
    Why do people think you should get DIY information on a site that explicitly forbids it in the RULES section.
    Why do...
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    They were used on the Pulse furnace. Why would...

    They were used on the Pulse furnace. Why would you use them on any other furnace?
    ...
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    I recently installed a modulating Trane XC95m for...

    I recently installed a modulating Trane XC95m for my downstairs. I love it. I don't know why someone that can afford it, would not want one.
    We've installed quite a few of them, and customers rave...
  27. Cordless drill chuck wobble, radial runout

    Just got a new Ridgid brushless cordless hammer/drill and watched the chuck wobble.
    I don't remember this issue with old drills back when they were made in the USA.
    So, I tested some of my recent...
  28. Replies
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    lib·er·al ˈlib(ə)rəl/ adjective 1. open to...

    lib·er·al
    ˈlib(ə)rəl/
    adjective
    1.
    open to new behavior or opinions and willing to discard traditional values.

    Not to be confused with Democrat or Republican.
    You're right, the lines are very...
  29. Replies
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    Sounds like you gave them a free diagnostic. ...

    Sounds like you gave them a free diagnostic.

    Second opinions should be limited to compressors and heat exchangers.
    If you go any further at no charge, you can site your code violations and advise...
  30. I don't know what your floor level is, but this...

    I don't know what your floor level is, but this code may help you to get a back water valve installed by the super.

    IPC 715.1 Sewage backflow.
    Where plumbing fixtures are installed on a floor...
  31. Sounds like a problem with drain sizing or...

    Sounds like a problem with drain sizing or venting. Obviously, the plumbing is all tied together.

    The adjoining units may be tied in on a horizontal line. I would think if at all, they should be...
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    Input voltage will affect motor performance.

    Input voltage will affect motor performance.
  33. Replies
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    If I were to choose, I would choose erratic...

    If I were to choose, I would choose erratic refrigeration.
    Not to say erratic refrigeration couldn't be caused by another issue, but the low pressure symptom is not going to direct you toward...
  34. Replies
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    Is the transformer common grounded to the...

    Is the transformer common grounded to the chassis?
    Have you hi pot tested the #2 compressor?
    Sounds like stray voltage somewhere.
    Is it 1Ř or 3Ř?
    Is there a second circulator that runs with stage...
  35. It was late when I wrote this. So, it wasn't...

    It was late when I wrote this. So, it wasn't fully explained how the formulas were integrated.

    If you've ever looked at a passive crossover for an audio speaker, you'll notice it uses capacitors...
  36. Correction

    Correction
  37. The science is basic math. E/IR, where R is used...

    The science is basic math.
    E/IR, where R is used for reactance measured as Ω's.
    R or XC is found by XC = 1/(2 π x f x C)
    f is frequency, and C is capacitance
    2pi represents a full sine wave in...
  38. Replies
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    730

    I see what you mean, by the post title, but the...

    I see what you mean, by the post title, but the description leads me to believe it's a heat pump system that continues to heat. Whether or not the od unit cycles on and off isn't detailed. Sounds...
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    My experience with CPS gauges and hoses.......

    My experience with CPS gauges and hoses....
    C-heap
    P-iece
    S-$€#

    Hopefully if they're asking $500 for a set, they will last longer than a couple months, like their ball valve hoses.
  40. Replies
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    730

    Stuck sequencer, or shorted aux heat coil,...

    Stuck sequencer, or shorted aux heat coil, shorted w wire.
    Pretty easy, if he's a tech.
    Just follow the 24v signal.

    I guess if it shuts off, it wouldn't be the shorted coil.
    Could be bad...
  41. Replies
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    549

    BS! There are thousands of these systems in our...

    BS!
    There are thousands of these systems in our area. Most units aren't even equipped with the newer auto circulate function.
    These systems aren't cast iron where water becomes black.
    These coils...
  42. Replies
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    549

    We have a lot of hydro heat systems (aka...

    We have a lot of hydro heat systems (aka "Apollo") here, using high capacity water heaters. 40gal 60Mbtuh input.
    Sometimes the homeowner complains of a lack of hot water for showers in the...
  43. Replies
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    ...and void the UL. Now, when it burns up you...

    ...and void the UL.
    Now, when it burns up you are responsible.
    Wish it were the good ol days, where a tech could be a tech...
  44. If you use an aftermarket board, be sure to check...

    If you use an aftermarket board, be sure to check reversing valve operation. Rheem & Rudd typically energize in heat rather than cool.

    Also, if a load shed is connected, they may be de-energizing...
  45. Sounds to me like they have a load shed control...

    Sounds to me like they have a load shed control breaking the heat pump.
  46. Replies
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    Pressure switch or draft issue making the...

    Pressure switch or draft issue making the pressure switch intermittently drop out is my suspicion as well.

    If you're a tech you should know how to test all of the safety controls. If not go over...
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    We've installed Fujitsu and Mitsubishi. No...

    We've installed Fujitsu and Mitsubishi.
    No problems that I know of.
    Both have good tech support, never had a problem getting through, spoke to an American that spoke proper English, and they...
  48. THANK YOU Travis & Fieldpiece Instruments!

    Wow, is all I can say. I've never had a company take care of me like this.
    It's refreshing to know there are still companies that really care about their customers.

    With a slow season upon us in...
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    Thank you Travis! You all have been extremely...

    Thank you Travis! You all have been extremely considerate to us consumers.
    Again, your customer service goes unmatched.

    I'm shipping out to you my SMAN3 ASAP!
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    I may have too much work to repair now. 1....

    I may have too much work to repair now.
    1. Cracked plastic housing
    2. Leaking gauge micron wires
    3. Ovaled pressure sensor barrel (didn't realize you need to leave the packing nut in there when...
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