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  1. Replies
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    TVOC Trigger

    What would be a typical set point, in PPM, to trigger increased ventilation in a system that monitors indoor TVOC content? Is 3ppm unrealistic?
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    Just like their front end. Any editing you do is...

    Just like their front end. Any editing you do is downloaded, not dynamic.
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    The pleated filter will work better and be...

    The pleated filter will work better and be cheaper if you include the labor involved in cleaning the mesh filters. I would not be concerned by the minmal pressure drop that a 1 inch pleated filter...
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    I'd add a piece of angle to the center of the...

    I'd add a piece of angle to the center of the plenum and get a 1 or 2 inch pleated filter made to fit at your filter supplier. You could put a pleat in without support but it all depends on how often...
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    Another Great Site

    http://www.oiltechtalk.com/
  6. Best to install a balancing damper at the branch...

    Best to install a balancing damper at the branch where it exits the main trunk.
  7. Thread: Sub Meters

    by big johnson
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    Sub Meters

    Does anyone have any knowledge of natural gas sub-meters that can outpuut a 0-10v or 4-20ma signal to a DDC system for trending? I've found one that cost over $5K but my pockets ain't that deep.
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    Heaterman nailed it. Getting the boiler to seal...

    Heaterman nailed it. Getting the boiler to seal after replacing a section is more luck than science.
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    29,951

    I think it's "powers". How can your CIS work on...

    I think it's "powers". How can your CIS work on an XP machine?
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    Thanks "A M". I re-posted in technical. I also...

    Thanks "A M". I re-posted in technical. I also found this from Honeywell:
    http://www.dehumidifierexperts.com/product.php?product=112860
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    Too Much Moisture

    I live in the Northwest and have oil heat. I have no AC, don't ever need it. The humidity in my home during the rainy winter months runs 55-70%. I'm in the process of installing interior storm...
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    I would check your local code. In my state, it...

    I would check your local code. In my state, it has to be removed and a ground contamination study done after it's removed. If you leave it a while and oil starts leaching into the ground, it can cost...
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    He's right, you shoudn't have a pump on a steam...

    He's right, you shoudn't have a pump on a steam system unless it's to pump make-up water back into the boiler and even then, city pressure should handle that. Maybe a condensate return pump?
  14. Than I would say it's in the control scheme that...

    Than I would say it's in the control scheme that makes it difficult to cross brands. Not saying it can't be done, but cosly, I'm sure.
  15. Yes, you can pair a heat pump with an oil...

    Yes, you can pair a heat pump with an oil furnace. It sounds to me that the first contractor was talking about the value of oil vs electric back-up heat. Depending on the design temp of your system,...
  16. The HX on your Lennox is what they call "heavy...

    The HX on your Lennox is what they call "heavy steel", not stainless. Stainless is normally used in areas that are subjected to high amounts of condensation. Oil furnaces should run a gross stack...
  17. Obviuosly your unit cannot be controlled in the...

    Obviuosly your unit cannot be controlled in the manor you wish it to be as a "stock" unit. I don't know enough about your heat pump controls to be able to say "buy this stat and it will work." So,...
  18. More controls. Honeywell makes a commercial grade...

    More controls. Honeywell makes a commercial grade stat for the home that has inputs for various temp RTD's. I'm not sure how that work with your heat pump. You would most likely end up gutting...
  19. That setting should have been done when your...

    That setting should have been done when your contractor installed the unit. Is your aux heat energizing too soon?
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    The furnace may be under-fired which causes...

    The furnace may be under-fired which causes condensation to occur. Your stack temp should be at least 400* gross. When your tech comes out he should do a combustion test and make sure the stack temp...
  21. Thread: smell

    by big johnson
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    741

    I agree, it doesn't sound like a dead animal to...

    I agree, it doesn't sound like a dead animal to me and if it was, the stench would be unmistakable. All I can think of is that if you've got any sound attinuation insulation inside the ducting,...
  22. Thread: smell

    by big johnson
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    Are you smelling it or just the building...

    Are you smelling it or just the building occupants?
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    Thanks everyone. Removed the snap ring on inlet...

    Thanks everyone. Removed the snap ring on inlet side bearing of blower wheel after talking to the bearing manufacturer. Now there's float on one end. Ya had it right!
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    Walking Shaft

    Gotta 50hp, belt driven, centrifigul fan with a 3" shaft and pillow block ball bearings. Bearings were new 3 months ago. Checked unit out and found a groove in the shaft on the drive side about 1/4"...
  25. Contractor is correct as far as the more media,...

    Contractor is correct as far as the more media, the lower pressure drop and greater filter longevity.
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    Is the licensing issue because you don't want to...

    Is the licensing issue because you don't want to pay for it? IMO Datamate is a POS. Have you ever used the advanced version? I have never had a need for it but have been told by techs that it is as...
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    360 cfm in a 6" duct is over 1000 feet per...

    360 cfm in a 6" duct is over 1000 feet per minute. That's a helluva lot of noise (can you say jet engine?). To get it down to a more desireable level, say not more than 600 fpm, you need a 10 inch...
  28. Thread: Greasing

    by big johnson
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    The age old question. An over greased bearing is...

    The age old question. An over greased bearing is not good but it will last longer than one without grease. Depending on the shaft size, I hardly ever put more than 3 strokes of the gun into a...
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    The savings is in the design more than the...

    The savings is in the design more than the equipment. I can't tell you how many times a certain type of equipment has been specified in the design only to have the mechanical contractor say they can...
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    After I complete a combustion test, I put a piece...

    After I complete a combustion test, I put a piece of foil tape over the hole. When I remove it for the following year's service, I generally see a brownish color on the inside of the tape but not...
  31. Short cycling is when the equipment has such a...

    Short cycling is when the equipment has such a short run time that it never approaches what is called a "steady state." When a tech does a tune up or cumbustion test, they let the unit run for at...
  32. Oil furnaces are rated for output, not input. Is...

    Oil furnaces are rated for output, not input. Is it short cycling, like less than a 10 minute run time for the burner?
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    If your burner and flue are set up correctly, you...

    If your burner and flue are set up correctly, you should not get over 100 ppm of CO ANYTIME during start up, run or shut down. Oil fired boilers are a bit touchy when it comes to nozzle type and...
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    If you're smelling "oil combustion", it could be...

    If you're smelling "oil combustion", it could be something more involved than a test hole in the stack. You have good reason to be concerned and I would not hazard a guess without actually being...
  35. Sheet metal work is costly, especially when it's...

    Sheet metal work is costly, especially when it's a custom or add on. A 4" filter rack can be found as a standard item, but installing it is a different story and this isn't China. We need to make a...
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    Problem Solved

    Sure enough, those IT pirates stole my address. Appreciate the help BC.
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    At this time I'm trying to find the IP address....

    At this time I'm trying to find the IP address. It appears that our IT department may have "stolen" the static address and assigned it elswhere.
    Still diggin'.
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    A W nozzle is one that can be used as a sort of...

    A W nozzle is one that can be used as a sort of standard replacement when an A or B is not available. Some techs claim that they work better, but that comes from expierience and knowing the system. I...
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    Okay then. As others have mentioned, the air flow...

    Okay then. As others have mentioned, the air flow needs to be reduced to maintain at least a 70* rise through the furnace. The gross stack temp should be at least 450* or you'll get water condensing...
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    Not a new BLN, it has worked in the past. Don't...

    Not a new BLN, it has worked in the past. Don't know if the host file was udated. I tried your suggestion before I posted here. I'll see if I can ping it.
    Thanks Ben
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    Is the furnace short cycling? What I mean is does...

    Is the furnace short cycling? What I mean is does it run for less than 10 minutes and then shut off? Is there a "cycles per hour" adjustment on your theromstat? Decreasing the firing rate is a last...
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    BLN Failure

    This is not a problem that shows up much so I'm not good at tracking it down. Siemens panel that normally talks to a central server is not connecting. Comunication cabling is in tact and the...
  43. We do it every quarter. It's a life saver unless...

    We do it every quarter. It's a life saver unless you like replacing compressors. If the work load is heavy, we require at the minimum a visual and touch kind of check. Over the years you start to...
  44. Thread: Green crap

    by big johnson
    Replies
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    909

    Is the wire in conduit? Sounds like the goo...

    Is the wire in conduit? Sounds like the goo electricians use as a lubricant when pulling wire. It used to harden over time and really cause problems so they changed it to stay nice and slimey and the...
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    Oxy/Acc and a #3 rosebud.

    Oxy/Acc and a #3 rosebud.
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    That's a very vague question with many...

    That's a very vague question with many possabilities. What kind of minor alarms are you talking about? The way to save money is usually in how the chillers are staged from the building DDC. I'm...
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    Yes, that sounds right to me if lag status is the...

    Yes, that sounds right to me if lag status is the same as enabled. I'm assuming you have a lead/lag program and if the point "PH.CHLR.LAG1.STATUS" means chlr is enabled then that statement makes...
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    High SC and low SH on circuit 2 plus the fact...

    High SC and low SH on circuit 2 plus the fact that putting a sprinkler on the condenser keeps the fuse from blowing indicates a mechanical problem, not electrical IMHO.
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    The sensor is a good idea. I'd highly recommend...

    The sensor is a good idea. I'd highly recommend it.
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    Yup, not much need for cooling in these parts.

    Yup, not much need for cooling in these parts.
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