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Recent content by lownox

  1. lownox

    60hz to 50Hz... and the motor sped up???

    Yesterday, we were testing a filtration unit with a fractional HP PSC motor. Oddly (to me) it is labeled 220V 60Hz. The rated RPM is 1050. So we ran this motor in our unit at the rated voltage using a variac. We were measuring RPM, current, and air flow through our filter as the motor is...
  2. lownox

    Draft Inducing Fan Control

    You will not get Lennox to approve much of anything. The gas portion of the unit is likely tested to ANSI 83.8. There are certain wind tests performed which include ignition, etc... They probably won't recommend or approve any configuration that was not tested and approved. If it were my...
  3. lownox

    Need Home Gas Furnace Recommendation

    I would only consider a condensing furnace (90+% efficient). Also, consider a two stage unit. Sizing the unit... well, that depends on where you are geographically (among other things, such as how well insulated your house is). What size unit it in your house now and what is the efficiency?
  4. lownox

    Time for TIG welding

    I am hoping someone more skilled than me can help me out. We are manufacturing steam manifold assemblies. The gray area that I am dealing with is TIME. Each of these manifolds is completely unique and custom designed per job. Calculating the time for the shop routings (labor hours) seems...
  5. lownox

    Gasoline Octane Rating

    black2003cobra, You nailed it. Thanks for the doc. I was thinking about it correctly after all... except I had somehow confused flash point with autoignition temperature. These things happen I suppose. Thanks again for all the replies and sorry to put you through a nub thread. Steve
  6. lownox

    Gasoline Octane Rating

    My mistake... I was saying flash point when I should have said autoignition temperature. Sorry.
  7. lownox

    Gasoline Octane Rating

    Interesting. So, the three typical octane rating that we see 87, 91, & 93... the flash points don't increase respectively for these three??? I assumed the flame speed would be about the same. This discussion assumes the engine design is constant... maybe and engine designed for 87 octane...
  8. lownox

    Gasoline Octane Rating

    Is it a fair description of octane rating to say it is relative to the flash point of the fuel? I have read the Wiki(octane rating) on the subject already. I have been having a discussion with a collegue about this and his understanding is that it is related to the flame speed... which I think...
  9. lownox

    Andover RTD sensor input?

    I would give Andover a call. Their controls ought to be able to use RTD's in lieu of Thermistors. I could be wrong though...
  10. lownox

    Ceiling Fan CFM

    That is likely because they are primarily used for circulating the air within a room. For what reason do you seek this information? Just curious...
  11. lownox

    Yoga Studio

    Gas burner is to much???? Heat is heat and there are plenty of options regarding modulating gas heaters. However, for this situation... the electric heat option is probably the easiest to implement.
  12. lownox

    Pulse-width modulated heater?

    Yup. See here... http://www.indeecocontrols.com/
  13. lownox

    Electric motor horsepower conversion

    http://en.wikipedia.org/wiki/Horsepower Take a look here.
  14. lownox

    Looking to find who makes this specific flame scanner/viewing head

    Scanner will only be as useful as the amplifier circuit that it mates with. For instance, Honeywell makse UV flame scanners, but they must be mated with the proper amplfier (sometimes integral to the flame safeguard control). I guess what I am saying is that if you change the scanner, you will...
  15. lownox

    air leakage velocity calculation

    Not entirely sure I understand what you are doing, but here is the basics. Room is pressurized to 50Pa, door opens... pressure drops while air is rushing out. For standard air density... V = 4005*Sqrt(vp) V=velocity in fpm vp=velcity pressure in "WC Seems that the maximum velocity you...
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