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Setting High Limit on AquaStat

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dpsmith67
dpsmith67 Member Posts: 6
in THE MAIN WALL
I have a 10 year old Honeywell L7224 AquaStat and I am unable to set the "High Limit" any lower than 180F.

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  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
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    Well if you’re doing right then the aquastat is bad, or you’re not doing it right.
    steve
  • HVACNUT
    HVACNUT Member Posts: 5,835
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    If you want to lower the high limit, you need to lower the low limit first. Keep 20° between the two. 
  • dpsmith67
    dpsmith67 Member Posts: 6
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    Device will not allow changes to low limit.  Automatically adjusts to a -15 differential from the HL temp.
  • pecmsg
    pecmsg Member Posts: 4,847
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    https://customer.honeywell.com/resources/techlit/TechLitDocuments/68-0000s/68-0281.pdf

    Page 5
    Adjusting Settings
    To discourage unauthorized changing of Aquastat
    settings, a procedure to enter the ADJUSTMENT mode
    is required. To enter the ADJUSTMENT mode, press
    the UP, DOWN, and I buttons (Refer to Fig. 5)
    simultaneously for three seconds. Press the I button
  • dpsmith67
    dpsmith67 Member Posts: 6
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    Have tried going into maintenance mode.  Seems like the HL range is 180 to 220F.  Cannot change LL as it automatically adjusts to -15 of HL.  Everything works fine other than that.  Just trying to save money on fuel by reducing run time to high temperature.
  • HVACNUT
    HVACNUT Member Posts: 5,835
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    What are the numbers after L7224?
    There are probably different versions of the same model and yours isn't adjustable.

  • dpsmith67
    dpsmith67 Member Posts: 6
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     No number or letter.  Just L7224/L7228

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