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Vitodens Operation

Mike T., Swampeast MO
Mike T., Swampeast MO Member Posts: 6,928
in THE MAIN WALL
First below normal temps of the season.

Room temp setting does not appear to be a simple parallel shift in the reset curve.

Room temp setting also appears to affect a fully TRVd system when the reset "target" has loads of headroom.

Tweaked the curve and settings a bit. Was afraid I might be running out of circulation power (without making adjustment to factory settings) but did another recovery test--raised 50 degree room to 66 degrees in 80 minutes. Boiler consuming 51 cubic feet per hour (90 or so possible) during the response test.

Comments

  • Weezbo
    Weezbo Member Posts: 6,232
    what is the outside temp Mike?

    that sure is a fast ramping set of emmitters to do that. are these Buderas pannels ?
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928


    Oversized standing iron. Outside temp was around 20°.
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
    Did BIG Recovery Test Last Night

    Significantly raised TRVs of about 650 sq.ft. EDR (1,049 total in system) and about 1900 sq.ft. living area (mainly 10' ceilings) while outside temp was falling from low 20s to upper teens. Doing entire ground floor and the same bedroom where I've been doing the small recovery tests. Ground floor radiators are only significantly oversized; upstairs rads are grossly oversized.

    With only that built-in circulator (probably operating at about 70-75% speed at that weather) every radiator heated quite rapidly. Boiler kicked up to full output for about 20 minutes then went back to modulating at around 51 mbh input (91 mbh possible). Could actually hear a bit of noise from the exhaust--nothing that would bother even a close neighbor, but I didn't have to put my ear against the screen ;) Still humid outside but light wind--looked like I was making a fog bank...

    Ground floor showed a rise of 4½° in 2½ hours, then started leveling off at setting of TRVs. 2nd floor bedroom rose 8° in 2 hours. All with measured supply temp of about 118°.

    Big dip you see in return temp on the graph is when all the TRVs were opened. Not sure what caused that 2nd dip in supply temp. Was in bed by that time. Note the very rapid resumption of the exact same output curve. Return temp fell, but supply temp stayed the same....

    Solid red = supply

    solid grey = flue

    solid green = outside (still on S side--N side thermometer reading about 2° lower during period--when in same position they read almost identically)

    dashed red = my supply target based on 141° @ 8° with 0.8 slope
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