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Type: Posts; User: speedracer

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  1. Replies
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    974

    thankyou very much

    thankyou very much
  2. Replies
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    1,911

    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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    654

    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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    684

    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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    746

    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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    6
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    913

    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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    1,089

    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...
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    1,600

    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...
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    3,137

    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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    1,029

    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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    4,931

    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...
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    4,931

    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...
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    1,120

    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.
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    562

    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...
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    1,283

    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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    1,131

    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.
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    794

    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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    562

    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.
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    738

    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...
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    1,675

    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...
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    537

    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...
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    1,250

    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...
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