Recent content by Rkupon1

  1. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Cliff notes^^^ Theres a big difference between what is PRACTICAL and TECHNICAL. Cost will always factor in. Especially upfront. Im doing my best to find that happy medium myself. Rich and i have been doung some fine tuning, and sofar so good honestly.
  2. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    The ERV runs independant of heat/ac call. If the air handler is running during a heat or ac call, than great. But the erv and fan motor are both doing a great job sofar for IAQ. I ve lived in 3 houses sofar, im 36. One was built in 55' with high effeciency equipment and r8 insulated/energy star...
  3. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    The buffer tank will work as the lowest down fire rate(18,000 btu s) defly is further away from whats typical btu s needed here in 20s and 30s. Not design btu s. My problem is finding that happy medium between boiler run/condensing and boiler off/stored thermal mass. I agree this system wasnt as...
  4. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Ok, great. I have alot to digest here. Rich n I have known each other for years thru business. Unfortunately, by the time i reached out to him on this job, my custom built house, i was already very convinced what i was doing would be great. We are now trying to salvage comfort n effeciency at...
  5. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Heres a quick snapshot 4pm, 38* outside, there was a call for heat, 6min burn cycle with 108*-110* water. I believe my reset ratio design was 140* water on 0* day, than it was 100* water on a 62* day. WWSD is set for 63*. I believe thats my outdoor reset curve. Bare with me as this...
  6. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Fyi, i also incorporated a taco pc700-2 with a sensor well in the buffer tank half way up. Its tied in with a sr504EXP switching relay
  7. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Yes, i shall do my best to relay answers to your questions as info. We are using 2-Goodman avptc29 air handler(s), both are only running between 550-650cfms. Duct design is tite and sized accordingly, we have all 4"+5" stackhead supplies thruout. Lotsa returns. The idea was the less is more...
  8. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Some basic info, Heat calc loss 1st flr-12,000 btu s 2nd flr-14,000 btu s Attached 2car garage(future zone for fan coil not in use right now)-14,000 btu s Detached finished garage-30-40,000 btu s. The detached shop isnt built yet, but will be next year. Planning on a 30x40 with radiant in floor...
  9. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Some pics of my work and current system set up
  10. Rkupon1

    How to dial in/settings: Navien ncb240e, hot water coil, buffer tank, outdoor reset

    Hey guys, new member here, so a little background history first. Im an hvac guy since 01', i ve only recently started to get into advanced hydronics and boiler systems. Pretty much been a forced hot air tin knocker my whole career. Im really startn to dig the controls aspect and high effeciency...
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