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Type: Posts; User: keith w

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    I don't know if all of their manifolds have...

    I don't know if all of their manifolds have life-time warranties, but that alone would influence my choice of future products. They were ridiculously helpful and generous in reconditioning my...
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    Thank you, very kind of you. Have a good day.

    Thank you, very kind of you. Have a good day.
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    Yellow Jacket abhors a vacuum?

    Just as an aside, and I don't want to product-plug too much here, but Yellow Jacket/Ritchie Engineering was one of the best companies I've EVER dealt with in terms of warranty/service, when my...
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    Legacy Lennox & Carrier SEER

    Hi: I've got a bunch of units that it would be very helpful to know the SEER of. The short list:

    Lennox CB19-26-2P with HP22-211-1P
    same AH with HS22-261V-2P
    CB19-31-2P with HS22-311V-2P...
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    Pony: I agree good communication isn't the same...

    Pony: I agree good communication isn't the same as being a good tech. Though it's ALWAYS part of being a good businessman, in case you want to go into business yourself. Even when you work with...
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    Hey Pony: I think people want to make sure...

    Hey Pony: I think people want to make sure they're encouraging good tradesmanship. It helps hold high standards and customer respect.

    But as for your question of what the site is good for, you DID...
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    Also: most contractors don't use polyiso under...

    Also: most contractors don't use polyiso under slabs. Extruded polystyrene is the more accepted practice, IMO. Polyiso, while having nice high r-values (though changeable with time) absorbs lots of...
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    I'm looking a little closer at the nomograph now....

    I'm looking a little closer at the nomograph now. First, it's mostly linear (I'd forgotten). That makes things pretty easy. The first thing you need to know is your heat flux, hopefully you already...
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    No I've never seen the formula. It should only...

    No I've never seen the formula. It should only take a few steps to derive it from the graph, you just have to determine formulas for the various curves. How's your diff. eq's?
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    Interesting point. But I believe the...

    Interesting point. But I believe the communication line still functions at or less than 60hz, and the skin effect is a feature of AC and a function of frequency. In which case the skin depth is over...
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    I'm mostly familiar with the Fujitsus, but you'd...

    I'm mostly familiar with the Fujitsus, but you'd just get an error code telling you as much and it wouldn't run, I believe. I could look up the error code. Same thing happens if you miswire the...
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    Haha, I had a picture in my head and I didn't let...

    Haha, I had a picture in my head and I didn't let go. It just sounded so ridiculous. Right, it was frost falling off the coil. That's funny.

    Never mind....
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    Nude sunbathing then.

    Nude sunbathing then.
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    Pony: if you've got your Universal certification,...

    Pony: if you've got your Universal certification, that indicates that you've demonstrated knowledge of basic refrigerant handling and environmental implications. Due to regulations that limit...
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    I sent you the nomograph. Yes, I often double-up...

    I sent you the nomograph. Yes, I often double-up radiant tubing density near walls, especially with windows and doors. But much more important are slab edge and under insulation details: I put at...
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    Had it right the first time. I wouldn't include...

    Had it right the first time. I wouldn't include an outdoor-reset mixer on the radiant loop unless (maybe) you're in a really extreme climate. Unnecessary complexity. The biggest value of the outdoor...
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    Pmeunier has it right. Humidity can be evaluated...

    Pmeunier has it right. Humidity can be evaluated as either absolute or relative, most of the time when we measure it we're measuring it as relative. Since warm air can carry more moisture than cold...
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    You didn't mention how old/long ago the...

    You didn't mention how old/long ago the insulation was installed? The VOC's associated with polyurethane foam drop sharply with time, as I understand the current science to indicate. Consider adding...
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    Plastic on the ground makes sense. Control...

    Plastic on the ground makes sense. Control exterior water: make sure drainage is all set to get water away from the house. Put dehumidifiers in the space, close the vents, insulate the side walls......
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    Perception might go both ways. That is, if you...

    Perception might go both ways. That is, if you get to sort of know your neighbors, or otherwise are aware that there might be one that is potentially bothered by the smoke, then their understanding...
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    Valves or pumps?

    If I understand, you are throttling your geo exchange loop down for your multiple geo units. Seems like you're overpumping your geo loop: if you have multi-speed pumps you could back them down,...
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    As per the AOP Rules only Professional Members *...

    As per the AOP Rules only Professional Members * can reply with
    advice to the OP. Anyone may post and ask questions. They may even
    question the * member answer but not give advice or expand on the...
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    oops, sorry I didn't see you'd already posted the...

    oops, sorry I didn't see you'd already posted the solution.
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    Okay, okay, it's been said but: read the manual....

    Okay, okay, it's been said but: read the manual. On many units there's a separate venting manual. There are LOTS of considerations, besides just length and number of elbows, height off ground,...
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    As per the AOP Rules only Professional Members *...

    As per the AOP Rules only Professional Members * can reply with
    advice to the OP. Anyone may post and ask questions. They may even
    question the * member answer but not give advice or expand on the...
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    The change from 12 to 14g wire was unnecessary....

    The change from 12 to 14g wire was unnecessary. Sorry to say, but you should have known that. Larger wire merely entails less resistance, which can almost never cause a problem...

    I wonder about...
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    I have a Sprinter van, which is a completely...

    I have a Sprinter van, which is a completely different beast than a standard American van (I had a Chevy before, for example): MUCH more standing room, easier to get around in. That said, it's crazy...
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    I'd probably just mix down the radiant with a...

    I'd probably just mix down the radiant with a thermostatic mixing valve. The zone thermostat will limit overheat. The Taco RMB looks interesting, I used something similar (an Automix) in a wood...
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    There's a somewhat complicated graph called a...

    There's a somewhat complicated graph called a nomograph that relates the intended room temperature (which relates to the floor temp and the insulation/tightness of the building, the provided water...
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    In most states around here, you need to have a...

    In most states around here, you need to have a state license to do resi & comm work. The Universal EPA certification is merely to keep you from being locked up as a bioterrorist should they catch you...
  31. upgrading old units: recycling air cleaners

    Hello -- I do energy efficiency assessments, and pass off the various pieces to the pertinent professionals. For a current client, they have 2 2-ton systems which are about 15 years old. I will be...
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    Thanks for the specifics!

    How do you like your system? Do you have any idea how much heat it gives you? How big are your panels, home-made vs. commercial, etc? I'd love to hear more.

    Keith
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    Good points

    Yes, I do understand about the heat transfer issue. I guess it's food for thought, and I'll do some calculations to understand where the trade offs are. I also agree that the greatest value of the...
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    Oops: coil vs. air

    I guess I was thinking of a 130F coil temp... so let me reframe the question: if we are aiming for a final supply air temp of 100F, and our return air is 70F, and our solar collector can bump that up...
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    Heat pump as heat booster

    Thanks for the comment.

    Yes, I realize that auxiliary electric heaters would typically boost heat pump output. The question is, since it's not clear when we'll have 130F+ temperatures from the...
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    Well, this is a solar air collector I'm talking...

    Well, this is a solar air collector I'm talking about, not a solar water collector. So I can't add a coil and all that. Instead, I would be stealing air out of the return plenum, heating it with the...
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    Hi there, We are looking at adding a solar air...

    Hi there,

    We are looking at adding a solar air system to a small commercial building rehab. The building will have several heat pump air handlers in the attic. I think the best way to install the...
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    ERV's do HRV also

    Actually (re: last post), all ERV's I've ever heard of also perform the function of HRV's: they transfer sensible and latent heat, typically at different efficiencies, as can be seen by the...
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    With respect to ERV's

    Alas, I don't have any time (or brain-power) to crunch numbers right now. Here's some (dangerously!) loose thinking:

    One ERV I've used (Stirling Technologies) is something like 60% efficient in...
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    Thanks -- very helpful

    You've mostly confirmed what I thought, and given me some new tidbits. Thanks everyone.

    The latent/sensible piece can be somewhat mitigated by an ERV: by never introducing the humidity to the...
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    Good summary, Perel

    I sent in a post that got lost, I think I used a bad password.

    What I said (in the lost post) was, that it is true there aren't enough soybeans in the US to change even our current diesel demand...
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    Specifics on duct changes

    I didn't really mean this thread to become some diatribe. Here's the simple questions:

    What about high-SEER units might require a change in ductwork?

    And, what about high-SEER units might make...
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    Originally posted by Steve Wiggins ...

    [QUOTE]Originally posted by Steve Wiggins
    [B]Energy savings are not realized by SEER ratings. Saving energy is source control, preventing the heat from getting in or out of the building envelope. ...
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    I work with clients on overall energy efficiency...

    I work with clients on overall energy efficiency considerations. As such, I work with architects, builders and homeowners, as well as hvac contractors, plumbers, etc. I also design and install solar...
  45. Thread: SEER question

    by keith w
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    window unit zone control

    The only point people missed, I think is that with a window unit, you might let the rest of your house get hot, and just cool the space you're in. And that, if you continue it long enough, is more...
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    Biodiesel in boilers

    I installed a small Toyotomi on-demand water heater (really a small low-mass boiler) which runs exclusively on b100, for a client. They also run both their cars on b100. I also run my car and my...
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    Hydro Delta & Quadro-therm Dual stage compressors

    I notice the H-D Quadro-therm has a two-stage reciprocating compressor that runs backwards with one piston or forward with 2 to vary the output. I guess they call it the Megatek TS technology.

    I...
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    Thanks for your thoughts. There are some...

    Thanks for your thoughts. There are some complications: in one of the houses, the radiant would only be for a portion, so we'd need some hot air too. In several cases, ducting the whole house from...
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    Hi Folks: I have several jobs that I am looking...

    Hi Folks:
    I have several jobs that I am looking into geothermal for. In each case, they are not particularly large loads, often only 3-5 tons total, but they would be easier served by two air...
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