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Type: Posts; User: odcman

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  1. Replies
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    We do virtually this in our fully ICF house with...

    We do virtually this in our fully ICF house with 14 foot catherdral ceilings in the south facing great room. We have a Lifebreath HRV and one of it's 4 intakes was placed at the top of the catherdral...
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    I'd put in a good quality duct fan with a...

    I'd put in a good quality duct fan with a thermostat to that room. That will allow you to get the temp you want, when you want and keep just minimal flow when its unoccupied. Fantech makes duct facns...
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    Yes indeed, for the price they are good. Things I...

    Yes indeed, for the price they are good. Things I wish I had on the 262.

    1. A settable differential for the DHW. It's hard coded at 6 F. One cycle of my boiler doesn't quite do 6 degrees, so it...
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    Actually, really clear. And makes sense too....

    Actually, really clear. And makes sense too. SImilar reasoning to my earlier post, but you have give some good guidelines for setbacks.

    Thanks
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    Yes, that's what I meant. It's not the gas...

    Yes, that's what I meant. It's not the gas efficiency, but the total furnace effficiency that changes. Power required by a blower motor goes up as the cube of the cfm requirement.

    In our...
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    Thanks for the responses. The buffer tank is to...

    Thanks for the responses. The buffer tank is to prevent short cycling on my Buderus and allow outdoor reset modulated water temps all the way down to 85 F. If I had a modulating boiler that would...
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    Yeah, perhaps. But I wish I could find a...

    Yeah, perhaps. But I wish I could find a modulating boiler that would work for me. Anything out there is going to be effectively "bang-bang" at my typical winter space heating requirements of 8-10...
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    You've probably hit the nail on the head there....

    You've probably hit the nail on the head there. It would be about 124 F for a 7 deg design day, or 12 degrees over where I've set it. Of course the temperature doesn't stay at the target+1/2...
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    I'd agree. It's really a comfort thing. Assuming...

    I'd agree. It's really a comfort thing. Assuming you have a 60000 btu furnace, that 600 mins is 586 cu ft of gas, which is about 16.6 cu meters, which is about 8 bucks including all taxes and...
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    3 ways. 1. From the knowledge that it's a 59...

    3 ways.

    1. From the knowledge that it's a 59 kBTU gross output Buderus boiler.
    2. From the Gas meter.
    3. From the time it takes the air handler to cool the series buffer tank 24 F (which is the...
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    I think you only really do setback for comfort....

    I think you only really do setback for comfort. It's nice to have a cooler room to sleep in, but that's about it.

    Setback makes sense from the engineering physics perspective. The cooler the...
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    Just clocked my furnace over the past 6 hours....

    Just clocked my furnace over the past 6 hours. 4500 sq. ft. Stone faced ICF house, lots of south facing glass. Nicely sheltered from northwest winds.

    Todays conditions: 60 km/h WNW wind, 10 F....
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    Problem solved....sort of. I did play with...

    Problem solved....sort of.

    I did play with the design temps and found that if I set the design boiler temp to 112 for a 7 degree design day, then the house kept a steady 70.2 over the 12 hours...
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    More than likely tripping on it's high temp...

    More than likely tripping on it's high temp limit. Get a pro to look at it. The self test doesn't run long enough to identify a clogged component problem or a bad inducer motor or things like that.
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    The Buderus came wih the house, so I won't be...

    The Buderus came wih the house, so I won't be replacing it in the next 25 years (or something reasonable anyway !) unless I got a good price for it. It's 9 months old and 85%AFUE, so not too bad,...
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    As far as I can tell by experimenting, the...

    As far as I can tell by experimenting, the terminal type just changes the allowable boiler target. For example, if I am 1 degree below desired room temp and I set the terminal type to low mass...
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    I think I have 5 gpm going through the pump in...

    I think I have 5 gpm going through the pump in the AH according to the Grundfos and Lifebreath manuals. So assuming that, it will put out 18kbtu per hour at 130F for a 350 cfm air flow rate. That's...
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    Yes, I too didn't like the auto differential....

    Yes, I too didn't like the auto differential. After going to all the trouble to put in a buffer tank, it was running around 10 degrees and giving me 2.2 cycles per hour. So I set it to 24 F, which...
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    The AHU fan always runs. It's a 60 W ECM motor...

    The AHU fan always runs. It's a 60 W ECM motor pushing 350 cfm. So it does circulate the warm air and I have 4 sq. ft. of returns in the great room and kitchen that have the south facing glass for...
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    It's a Buderus GA124/17, which puts out 59kbtu...

    It's a Buderus GA124/17, which puts out 59kbtu gross. Piped to a manifold, no P/S. The AH is 1 takeoff from the manifold, the DHW is the other. Checkvalves on outlet and retun manifolds and at the AH...
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    Might be better posted here than in Controls...

    Might be better posted here than in Controls which is mostly commercial...

    Does anybody have an idea how much the Tekmar 062 can modulate boiler temps down from the calculated boiler tempeature...
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    Does anybody have an idea how much the Tekmar 062...

    Does anybody have an idea how much the Tekmar 062 can modulate boiler temps down from the calculated boiler tempeature based on the heating curve with outdoor reset ? My continuous circ Air handler...
  23. Thread: Out in the cold

    by odcman
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    773

    I assume this is the condensate discharge line ?...

    I assume this is the condensate discharge line ? Can you move the discharge line to parallel the exhaust vent of the furnace ? This will keep it warm and avoid your problem. Another option is to keep...
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    Very clean install. I'll take some pics too....

    Very clean install. I'll take some pics too.
    What are your design day temps ? Does the NTi stay in condensing mode most of the time ? Depends on the AH return temp I assume. If your minimum loads...
  25. Thread: Short cycling

    by odcman
    Replies
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    1,738

    For what it's worth, I have a 1950 square foot...

    For what it's worth, I have a 1950 square foot house in a much colder climate (average 7560 degree days per year). The house is old (108 years) and not too well insulated by today's standards. At the...
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