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honeywell aquastat L7224U

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ray hickethier
ray hickethier Member Posts: 26
in THE MAIN WALL
I`ll try it! I`ll let you know tomorrow!

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  • ray hickethier
    ray hickethier Member Posts: 26
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    honeywell L7224U aquastat

    I have a new Honeywell L7224U electronic aquastat that is annoying my customer. When it drops to the low limit differential the circ. stops and the oil burner continues to run. But as it returns to the low limit setpoint it stops momentarily and then restarts a second or so later and continues with the burner and circulator running. Hy setpoints are 180 high and 170 low with 10 differentials for both. Can something be done to stop this stop and start condition?
  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541
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    You

    have them set too close together.Try to keep the HL diff as high as possible to cut down on cycling.I wish Honeywell would make the diffs adjustable over a wider range. 20 degrees is not enough.

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  • ray hickethier
    ray hickethier Member Posts: 26
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    this is not an L8124 and instructions in the brochure say "setting the Low Limit less than the High Differential below the high limit is not allowed as improper circulator and zone control functions could result". That is why I set the high at 180 and the low at 170 with 10 degree differentials. In actuallity the circ. doesn`t stop until the boiler temp. reaches 160
  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541
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    I'm

    not saying to only increase the HL diff,Try this 185HL 20HL df 165LL 10 LLdf. With a good coil and mixing valve I've set the LL at 145-150 with no DHW complaints

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  • ray hickethier
    ray hickethier Member Posts: 26
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    I tried your advice AND spoke with Honeywell. They recommended to try a 180 degree high and
    a 150 degree low with 10 diff. I tried your recommended settings and theirs and neither worked. I installed a L8151a as was on originally.
    They also recommended contacting Ultimate boiler to see what their recommended settings were. They had no rec. as the control is too new on the market.
    As I stated yesterday the burner shuts down and immediately restarts at the low limit setpoint. Blah! Electronics!
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