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    Limited out (5 Posts)

  • danger danger January 24, 2008 @ 8:25 PM
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    Hot water boiler limit

    I have a 15000 sq ft nursing home with a Weil Mclain MGB-5 boiler and 4 zones of 1" fin tube radiation controlled by wall t-stat and zone valves.Last spring the boiler inspector requested that a manual reset high limit be installed and also a manual reset low water cutoff. We removed the combo boiler control and limit and installed the requested controls along with a "smart" boiler control with outdoor reset.The limit switch has now become the most important switch on the boiler as it reqires constant attention.It has opened on numerous occasions during all types of temperatures from -22 to +39. The system requires a water temp of 190 to keep up at design temp. (-11) We have the adjustable limit set at 210. Any suggestions ?
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  • Maynard Maynard January 24, 2008 @ 9:04 PM
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    High Limit

    We Set The Manual Reset Aquastat @ 240F To Avoid The Nusance Calls You Are Having.
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  • danger danger January 24, 2008 @ 9:12 PM
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    How hot is TOO HOT ?
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  • Ron Ron January 25, 2008 @ 9:43 AM
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    Did you

    leave an operating aquastat in the circuit?
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  • Matt Matt January 24, 2008 @ 9:16 PM
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    240

    we also use 240 for the manual reset To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
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