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Type: Posts; User: speedracer

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  1. Replies
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    thankyou very much

    thankyou very much
  2. Replies
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    2,111

    The furnace should stay on continuously with a...

    The furnace should stay on continuously with a call for heat, not cycle every 5-10 minutes as you stated. This indicates a problem with air flow, such as cycling on the high temperature limit. There...
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    694

    Oil return relies on a properly designed suction...

    Oil return relies on a properly designed suction pipe, especially important when the evap is below the compressor.
    Suction pipe sizing has to account for unloading, ie, sized for minimum flow...
  4. Replies
    4
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    722

    The purpose of having a low voltage system is...

    The purpose of having a low voltage system is safety for the operators, and grounding one leg ensures that it stays less than 30 v. Without the tie-down, the voltage can float around with respect to...
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    812

    I feel your pain. It reminded me of the time me...

    I feel your pain. It reminded me of the time me and my now wife went to a New Years party downtown (DC), and got so faced we stayed at a hotel where they had just renovated ... all new rug and...
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    972

    I don't remember the value off hand, but the...

    I don't remember the value off hand, but the thing you're looking for is that all the windings be close to the same. That is a three phase motor?
    The resistance will be something greater than zero...
  7. Thread: AXV

    by speedracer
    Replies
    6
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    1,220

    With increasing evap pressure, the txv will close...

    With increasing evap pressure, the txv will close down a bit. It's a trick question though, because at steady state, the first thing that will happen is that superheat goes up, causing the valve to...
  8. Replies
    21
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    1,653

    Oil burners are both simple and complicated....

    Oil burners are both simple and complicated. There is a motor which drives an air blower and a fuel pump. The fuel will be pumped whenever the motor is running, spraying into the fire-box whether it...
  9. Replies
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    3,299

    The blackened tape (and paint damage below it?)...

    The blackened tape (and paint damage below it?) shows how the air is tunneling through the center of the heater. There is low air flow on the side due to the abrupt duct transitions. That would...
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    1,162

    You might try a registry cleaner to look for...

    You might try a registry cleaner to look for dangling entries left over from the bug.
  11. Replies
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    6,256

    When my humidifier is running, there is no...

    When my humidifier is running, there is no problem hearing the water flow. If you turn up the stat for a call for heat, with the furnace running adjust the humidistat from low to high and listen. You...
  12. Replies
    13
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    6,256

    A solenoid valve uses a simple coil of wire to...

    A solenoid valve uses a simple coil of wire to magnetically operate the valve. When isolated from the circuitry, it will show continuity with an ohm meter ... although it will be something greater...
  13. Replies
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    1,170

    I'm agreeing with dkinz on less insertion. Add a...

    I'm agreeing with dkinz on less insertion. Add a suitable nipple and coupling to the threaded insert so that the tip of the well is flush to the inner wall of the pipe.
  14. Replies
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    586

    I saw TSO at the Patriot Center in Fairfax VA...

    I saw TSO at the Patriot Center in Fairfax VA last year, and loved it. They're very loud, and the light show with all those lasers was awesome. I'd go again this year, but I just got tickets to see...
  15. Replies
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    1,318

    The loss of suction velocity is very important,...

    The loss of suction velocity is very important, but I havn't had any problems with oil return yet. In the range of 2 to 10 tons, a reduction of evap load of 20% doesn't seem to be harmfull when...
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    1,182

    I started in '81, but I imagine you just phoned...

    I started in '81, but I imagine you just phoned in after a call was completed to get the next assignment.
  17. I'm having a little trouble with this. Alive, in...

    I'm having a little trouble with this. Alive, in a pure methane atmosphere? With nothing (conventional) to eat.
  18. Green, you say? Assuming you're not stark,...

    Green, you say?
    Assuming you're not stark, barking mad, I'd guess they were in the pipe when installed.
  19. That's a big difference in price. $300 will buy a...

    That's a big difference in price. $300 will buy a lot of flat 1"ASJ.
  20. Replies
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    863

    Yes and no. The fan switch controls the fan...

    Yes and no. The fan switch controls the fan according to temperature, but the reason it's acting like that could be due to various things being wrong. Only an on-site inspection and testing will...
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    593

    It seems more usefull for an appliance repair...

    It seems more usefull for an appliance repair shop rather than hvac. Other than condensate pumps, I don't see much plug-in stuff.
  22. Replies
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    793

    You can't measure resistance like that for an...

    You can't measure resistance like that for an inductive load. The actual amp draw is determined by a combination of resistance and counter-emf generated by the spinning motor.
    The motor becomes a...
  23. Replies
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    1,749

    Never more than 15psi for acetylene. Acet...

    Never more than 15psi for acetylene. Acet regulators are limited to levels below 15 because it's unstable above that ... meaning explosive. Oxygen usually about 40psi.
    The handle valves are...
  24. Replies
    3
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    548

    Three phase windings should all read the same...

    Three phase windings should all read the same line to line, and the bigger the motor the smaller the ohm value will be. It will usually be less than 10 ohm, and maybe only 0.5 ohm for big motors. If...
  25. Replies
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    1,327

    If you really wanted to do it, just power a...

    If you really wanted to do it, just power a multi-pole relay with each of the stat output terminals (in parallel with the first RTU terminals) ... Y to one relay coil, Y2 to another relay, W to a...
  26. Thread: Electrical

    by speedracer
    Replies
    5
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    603

    Do you mean bumping a motor? Like in checking for...

    Do you mean bumping a motor? Like in checking for direction of rotation? Never heard of bumping phases. But then, my training is in air conditioning.
  27. Replies
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    604

    Maybe use a cleaner listed for evaps, like...

    Maybe use a cleaner listed for evaps, like coil-rite.
  28. Replies
    12
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    1,318

    If it's not a package unit, I put the bypass...

    If it's not a package unit, I put the bypass right around the compressor, with a desuperheater txv. Too many unknowns with a split system. Idealy, the bypass line should be pitched like a drain going...
  29. Replies
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    680

    I think a 64 bit os and hardware will run 32 bit...

    I think a 64 bit os and hardware will run 32 bit stuff, but for anti virus software, it should be 64 bit capable to deal with the file system etc.
  30. Replies
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    1,949

    It's a tough choice to make, with various...

    It's a tough choice to make, with various features and price considered. The M2 doesn't have much memory built-in for standalone logging, and no display without a $300 terminal. It would probably...
  31. Replies
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    1,198

    Here's a link to some triac info ......

    Here's a link to some triac info ...
    http://www.play-hookey.com/semiconductors/diac_triac.html
  32. Replies
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    30,435

    Mike C Fairfax, VA Ex Navy MM, CVA-63 and...

    Mike C Fairfax, VA
    Ex Navy MM, CVA-63 and FF-1093
    Commercial service and installs for 24 years
    Builder of FFR5113K
  33. Thanks for the kind words guys. What could...

    Thanks for the kind words guys.
    What could cause the heat to cycle on every ten minutes or so while cooling is in progress, and uninterupted?
    SWAG is two stats with conflicting settings, maybe...
  34. If this is a test question, find 20psi on your...

    If this is a test question, find 20psi on your ref chart and then match whichever refrigerant has the closest sat temp. 717 is 6*. That's my guess and I'm sticking to it.
  35. The receiver "receives" the gas/liquid...

    The receiver "receives" the gas/liquid refrigerant (can you admit it is "condensing?) exiting the condensor. Through gravity the liquid falls to the bottom of the receiver where it accumulates and is...
  36. Thread: DASHPOT

    by speedracer
    Replies
    6
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    1,328

    On an carbureter, a dashpot was/is used to slow...

    On an carbureter, a dashpot was/is used to slow the closing of the throttle valve so as not to stall the engine. Full name, anti-stall dashpot. Vaguely like a shock absorber or a door closer....
  37. Replies
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    683

    There would be no point to a vent at that place.

    There would be no point to a vent at that place.
  38. It sounds like the furnace is starting during...

    It sounds like the furnace is starting during your cooling cycle. Fan shuts off, superheat down, suction p down, then suction p up with high superheat as the fan starts blowing hot air. Can't think...
  39. Replies
    6
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    683

    To "vent a trap" you add an open riser just after...

    To "vent a trap" you add an open riser just after the trap, so that air can be entrained with the flowing water. The purpose is to prevent a siphon from getting started where the trap water is...
  40. Taken a step farther, you probably won't have any...

    Taken a step farther, you probably won't have any subcooling until the receiver if completely full, and the refrigerant actually starts to back up into the condenser.
  41. Replies
    164
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    14,064

    It's hard to believe that nobody will give you a...

    It's hard to believe that nobody will give you a chance.
    The last three apprentices I've worked with have been totally unskilled, with no mechanical aptitude, and no refrigeration cycle knowledge,...
  42. Replies
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    2,716

    The xfmr may have primary taps for 208 and 240 v....

    The xfmr may have primary taps for 208 and 240 v. If you have 240 feed, measured line to line, then it should be connected to the com and 240v tap. Some mfrs have a 27v max, others don't.
  43. Replies
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    717

    Speaking about data loggers, I've been looking at...

    Speaking about data loggers, I've been looking at the DaqPro eight channel. Any experienced users?
    http://www.fouriersystems.com/daqpro.html
  44. Since the purpose of subcooling is to assure...

    Since the purpose of subcooling is to assure fully liquid refrigerant delivery to the TXV, you put a sight glass right before the valve. Vertical lift from the condenser to the evap will require...
  45. The solenoid valve is to prevent equalizing, and...

    The solenoid valve is to prevent equalizing, and the TXV is for feedback controlled metering of refrigerant. With the liquid trapped in the condenser on off cycles, there is less refrigerant...
  46. Thread: NASCAR

    by speedracer
    Replies
    18
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    1,012

    I went to Dover three times before I did a 30...

    I went to Dover three times before I did a 30 second lap. I'll never forget that first ride-along, where I found out what going fast meant. The second and third times, they let me hang a small...
  47. Quote:...

    Quote:
    ____________________________________________________
    The unit I work on uses a Carlyle 06D semi-hermetic compressor, that has an oil sight glass. How will the appearance change? More foaming...
  48. Replies
    15
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    2,132

    I don't know if it's easier to put a timer on the...

    I don't know if it's easier to put a timer on the sail switch, but otherwise, what you want is a relay wired NC feeding the humidistat signal to the humidifier that is powered by the heat signal....
  49. Replies
    6
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    857

    If the stat is set too low during the day, return...

    If the stat is set too low during the day, return air temp will eventually start to drop at night. Low return temp will cause low suction pressure and the evap coil will start to make ice. Once the...
  50. Replies
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    709

    It's normal for a heat pump to condense moisture...

    It's normal for a heat pump to condense moisture from the air outside, but it could be a bit low on charge if it is the only one dripping. Is the heat output adequate? What is discharge temp at a...
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