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  1. Is that the approved sort of tape, which has a...

    Is that the approved sort of tape, which has a shiny metallic finish? I wonder if its emissivity is just a lot lower than the adjacent fiberglass, while the temp is the same? By one emissivity table...
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    Thanks - the VisionPro looks like it'd do the...

    Thanks - the VisionPro looks like it'd do the trick (finally got an inst manual off the Honeywell site after about ten minutes of clicking and aborting their infinite-looping javascripts about half a...
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    810

    Who knows of a 7-day programmable stat made for a...

    Who knows of a 7-day programmable stat made for a heat-only application? I posted the same question several weeks ago in commercial, but a resi stat would do the trick if anyone has one to suggest.
    ...
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    Huh ... dash just posted in another thread...

    Huh ... dash just posted in another thread that the ESP measurement should include everything external to the manufacturer supplied furnace blower and cabinet - that makes me feel better because...
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    By way of comparison, about one third is what I...

    By way of comparison, about one third is what I lose today on the longest duct run here, an uninsulated galvanized duct going through the (otherwise) unheated basement. (I leave it that way because...
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    First, you should check me on whether 30 degrees...

    First, you should check me on whether 30 degrees is really acceptable - that's off the top of my head and I was thinking of a condensing furnace which you have not got. The temp rise range that's...
  7. It's normal for them to have a bit of a "coggy"...

    It's normal for them to have a bit of a "coggy" sound as they ramp up from a full stop. Is this a significant change from what you were used to before? Has the blower wheel been cleaned lately? ...
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    Ok, so your firing rate is about 6.5% low on both...

    Ok, so your firing rate is about 6.5% low on both stages. I think Portland is within 1000 ft of sea level, so there is no reason for the furnace not to be adjusted to its full nominal firing rate....
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    Re: POSSIBLE SOLUTION

    I've heard of that being done, and been tempted myself, with old natural-draft ribbon burner furnaces (where opinions vary on the relative merits of reducing orifice size or simply closing one off...
  10. Hi, Who makes a programmable 24V stat (7-day...

    Hi,

    Who makes a programmable 24V stat (7-day preferable) that is either heat-only, or has a config option that definitely makes it heat only so there is no control on the front that could possibly...
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    I'm with Midwest. You don't sound defeated by the...

    I'm with Midwest. You don't sound defeated by the system yet, and there's no benefit to you or to the system if you are. Go ahead and supply your calculations and your insistence, to be preserved in...
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    The two-stage Carrier the homeowner referred to...

    The two-stage Carrier the homeowner referred to is smaller (40k high stage). I don't know of any smaller condensing furnace. The smallest residential 80% I know of is the 28k Fedders.
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    I agree, talk with the city inspector yourself....

    I agree, talk with the city inspector yourself. They're often reasonable folks.

    It's not necessarily that the contractor is out to mislead you, but could have had a talk with the inspector's...
  14. Thread: gas valve

    by chapmanf
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    1,157

    Aha. Would not have been a bad guess, given it...

    Aha. Would not have been a bad guess, given it didn't seem to matter which wire you wiggled.



    You meant an open, right hvac? a short would have needed something to short to.
  15. Replies
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    There's more than one mystery here. In a couple...

    There's more than one mystery here. In a couple of side plots, I might wonder if the hole in the wall at your thermostat mounting base is well sealed, or if the thermostat is one that has an...
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    Re: Prop,

    Counterintuitive, isn't it? Maybe part of why flight didn't get invented earlier.

    Here's a fun trick. You need two things: 1. kitchen faucet. 1. soup spoon.

    Open the faucet to make a nice...
  17. Thread: Great Stuff

    by chapmanf
    Replies
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    755

    Re: WOW - Didn't Know

    Depends on age of house and wiring method. Romex is happy in an insulated wall. Knob-and-tube is not - those wires were rated for free circulating air in that space. Blowing insulation into a wall...
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    Thanks for that - I could buy the density as the...

    Thanks for that - I could buy the density as the explanation why they give different SP budgets for heat and cooling. Good to know it doesn't include the filter (though that strikes me as a bit of a...
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    Dang, Robo, you were my best hope for a serious...

    Dang, Robo, you were my best hope for a serious answer on this one.

    I understand how you might have a hair trigger about the brand because I've seen the kind of heat you take about it in other...
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    hehe. Well, there's time yet. So far my only...

    hehe. Well, there's time yet. So far my only questions that bear on Goodman are about whether their CFM/temp rise table might have a typo or there might have been some issue with ECM programming, and...
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    Some of the replies were to multiply the...

    Some of the replies were to multiply the nameplate amps for the motor by 120 to get watts. Ok in a pinch but will tend to overestimate the cost - a motor won't always draw its nameplate amps. A PSC...
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    Thanks renaisanse and Robo. Just to clarify, I...

    Thanks renaisanse and Robo. Just to clarify, I didn't have any interest in changing the piston, as it is exactly the one on the condenser nameplate; the only reason I mentioned that the current...
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    AFAICT, the Infinity 96 is the 58MVP. But be...

    AFAICT, the Infinity 96 is the 58MVP. But be careful, 58MVP isn't a complete model number, that'll be something like 58MVPnnnXssscc where the sss is a 'series.' It might be that only certain recent...
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    Eggzackly. Clocking the meter tells you how many...

    Eggzackly. Clocking the meter tells you how many BTUs per hour are going in. About 20% of those are going to keep your chimney warm, and the other 80% better be accounted for in so many cubic feet...
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    A friend inherited an ancient, oversized natural...

    A friend inherited an ancient, oversized natural draft gas furnace with a fairly recent AC retrofit (38TZA024300 outdoors, CC5AXA024014 indoors with R410a and piston 61, which is not the piston shown...
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    I really wouldn't worry much. As long as somebody...

    I really wouldn't worry much. As long as somebody carefully checks that there wasn't anything about the installation that killed the draft inducer, you probably got one with a sample defect. Defect...
  27. I'll go with the mistorqued neutral terminal...

    I'll go with the mistorqued neutral terminal theory.

    No matter who made the recep, it's nearly certain the copper you're seeing on the outside at the neutral screw is the same piece of copper...
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    Re: Cool speech!

    Thanks! :)



    The funny part is, in the heating season, the difference between a more and less efficient blower motor sort of disappears in the end. Any wasted energy in a motor comes out as...
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    Re: 2 state furn

    I meant to cover that earlier. The only difference would be that at low stage the furnace will be spending more time running at its top efficiency; heating up and cooling down are a bit wasteful, and...
  30. Replies
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    One trick in that is to make sure you measure in...

    One trick in that is to make sure you measure in the supply as close to the furnace as you can get without your thermometer having "line of sight" to the heat exchanger - if you could draw a straight...
  31. Replies
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    There's a very informative test you can do where...

    There's a very informative test you can do where the only special tools you need are your eyes, a watch, your gas meter, and a recent gas bill. Depending on what you learn, you either have a definite...
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    You know, I had a friend who really did drive...

    You know, I had a friend who really did drive sort of like that. It was funny that she never seemed to notice, probably because she was doing it (like you mostly don't notice your heart beating) but...
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    If you're in a city or town with a local gov't...

    If you're in a city or town with a local gov't website that has the local building codes on line, you may find the design temps there too.
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    crunch ... splash ...

    that broke the ice all right. ;)

    DC voltage: well, kinda. The variable speed motor is a GE critter called an ECM (for electronically commutated motor) and it looks like a round box of electronics...
  35. Thread: Thermidistat

    by chapmanf
    Replies
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    855

    Separated at birth?

    Hm, looks familiar :)

    http://www.lennox.com/products/overview.asp?model=SIGSTAT

    http://www.icca.invensys.com/robertshaw/index.htm#%239800iSeries
  36. Replies
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    If the XV90 will be replacing an older,...

    If the XV90 will be replacing an older, noncondensing furnace, the change means you will now have a furnace that produces condensate when it runs, as well as the AC condensing water in the summer. So...
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    Easy to tell if you're paying attention when the...

    Easy to tell if you're paying attention when the cycle starts, because you always get to hear what high draft sounds like for 15 secs prepurge, then it always switches to low draft while the igniter...
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    Hmm. Looks to me like the OP has been using...

    Hmm. Looks to me like the OP has been using "would you do a load calc" as a screening question in selecting a contractor--not asking them all to come out and do it--and has clearly expressed...
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    wotta coincidence

    In another thread, behemoth60 just posted a link to a Canadian site that explains using utility bills for sizing:

    http://www.cmhc-schl.gc.ca/en/burema/gesein/abhose/ce_048.cfm#bills

    A little...
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    Interesting question. Double-edged, a bit. Seems...

    Interesting question. Double-edged, a bit. Seems to me most of the weird things I've seen done by pros fall in the "I've been doing this so long I don't need to bother with those pesky calculations...
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    Are they 5-6% low? If so, while it can't...

    Are they 5-6% low? If so, while it can't completely explain being 17% below the spec'd temp rise, it could be part of the picture.



    The numbers look reasonable - have you confirmed that's...
  42. Replies
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    Sorry I didn't see this earlier. This is...

    Sorry I didn't see this earlier. This is something I've done for a few people informally (I'm a computer geek, not an HVAC installer, though I did HVAC controls software in a past life). I cannot...
  43. Replies
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    It may depend on the furnace whether the first...

    It may depend on the furnace whether the first stage rise is lower than second. Many reduce the blower speed proportionately so the temp rise is about the same. But yes, if the BTU input is low the...
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    The silver lining is that the house built in 1948...

    The silver lining is that the house built in 1948 probably has a long history of actual billed gas usage, and that's really actual data: a working furnace hooked to an accurate gas meter for a few...
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    Sometimes I wonder what's the point of utterly...

    Sometimes I wonder what's the point of utterly refusing to give the HO useful information even when it's right there to give and doesn't involve a safety risk. A HO is perfectly capable of taking a...
  46. Thanks for the information - nothing to report on...

    Thanks for the information - nothing to report on the G12. Wondering if I could possibly recommend derating it as an inexpensive comfort improvement for the (probably short) remainder of its service...
  47. was this the week you were planning to take out...

    was this the week you were planning to take out the old derated G12 in a rectory?

    -Chap
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    But then, how many installations have you seen...

    But then, how many installations have you seen that wouldn't even meet minimum specifications? Sure, there's no silver bullet, but it doesn't hurt to have another pair of eyes looking at the work,...
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    Oh yeah, and on the size of the one coming out,...

    Oh yeah, and on the size of the one coming out, like the 165k one above. Yup, that's gotta be right. :D



    Hmm, well, the contractor who is willing to pull a permit before starting the work is at...
  50. Somehow last night one of the most important...

    Somehow last night one of the most important points slipped my mind completely. It's one of those things that's stunningly obvious once pointed out, but easy to miss at first.

    All the inefficiency...
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