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  1. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    Thanks again for your advice. I think the easy answer is no. Your point about the total boiler running time is well noted.
  2. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    I forgot to put directional arrows on the drawing.
  3. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    It's not that the zones don't match. The temperature difference I'm fretting about (maybe unnecessarily) is across the hydraulic separation —i.e. closely spaced tees— between boiler pump and zone pump. From my observations it seems a good portion of the hot water supply coming from the boiler...
  4. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    That makes complete sense. Looks like an autocorrect error here, but I can't make sense of it.
  5. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    What will measuring the amperage tell me?
  6. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    If I separated the rads from the floors, what would you then change? Send hotter water to the rads? Just to clarify, when you say "loop," do you mean in series? The emitters are all in parallel within the zones.
  7. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    I agree that if the cool return water from the zones heading to the boiler is crucial. In the image above, the cool water returning from the zones is at 84F. The problem that I see is that the water returning to the boiler is hotter 88F. More to the pount, I'm not happy with the 9F split between...
  8. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    The boiler isn't short cycling (currently 15-45 cycles per day). Any thoughts as to how I can get a slower flow rate, if that's what you're saying I need? What mode would you use on the Taco VT2218?
  9. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    Could changing the primary and secondary pump flow rates be a way to get more heat out to the zones? I'm confused as to why there always seems to be a temperature drop between the primary supply and the secondary supply. There often seems to be a ~10F drop between the supply from the boiler and...
  10. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    The piping is under 7/8" tongue and groove subfloor and 3/8" hardwood.
  11. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    60C (140F) is what's required to heat my house at -17C (1F), based on the heat loss for my house, and the emitters we installed. In the past winter, we only had a few days that got close to that temperature, around 5F (-15C), but the house was cozy on those days. Actually, more cozy than usual...
  12. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    It's hardwood flooring (3/8") with tongue and groove subfloor (7/8"). (NB: the actual insulation used is R22, and I didn't use a reflective foil.) I don't have a floor sensor, but I designed the system maximum temperature with this in mind. At design temperature, with the effective R1.85...
  13. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    That's right, it's all one temperature. Design system temperature is 140F (at 1F outdoor temp), and max temp is 154F. Minimum system temperature is 93F.
  14. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    The delta t in the primary loop is comparable to the secondary, when temperatures are higher. Yesterday the delta t was 9F in the primary and 9F in the secondary. When the weather gets colder, the primary delta t will increase. I have data from a day in March, for instance, the outdoor...
  15. davie

    Advice on Fine-Tuning Primary/Secondary Pumps

    A few years ago, I got some great help here doing heat loss calculations, choosing a boiler, and designing a radiant system for my home. The system is installed now, and it ran well all last winter. I'm very happy with how efficient it has been, and how comfortable it is. Thanks to everyone who...
  16. davie

    Expansion noise prevention running PEX through joists

    Hi all, I'm wondering what precautions to take when running PEX through joists to prevent expansion noises. Is just running it through a clearance hole good enough? Should it go through some sort of hanger/bushing? How many 1/2" or 5/8" pipes would you put through one clearance hole? I was...
  17. davie

    2 Radiators not getting hot, unless bled daily.

    Well, that does narrow it down a bit. I tend to agree with you that it is a flow issue. Sounds like the head loss on those two rads is significantly higher than the others. When you open the bleeder valve, you are creating a lower head loss path for the water to take, and thus bringing an...
  18. davie

    2 Radiators not getting hot, unless bled daily.

    When you say you "bleed" the rads to get heat to them, do you mean that there is a significant amount of air which needs to be bled? Or do you mean that you let water flow out through the bleed valve? If they are filling with air, then that's one issue, and would explain why they aren't getting...
  19. davie

    Feedback on Hydronic Schematic

    Here's a new question about this system: How do I size the pump for the secondary loop? I understand that the relationship of resistance to flow in a fluid "circuit" is similar to that found in an electrical circuit, i.e. flow resistance decreases when the fluid has more possible paths to...
  20. davie

    Feedback on Hydronic Schematic

    Thanks for the compliment, CCL. I used Adobe InDesign to draw it. I just drew each individual element once, and then copied them for all other instances. If you are interested, I can post the original ".ai" file here for you (and others) to use.
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