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All models except 133 are equipped with a manual
reset high limit. Set the manual limit to its maximum
set point.
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Set the auto limit(s) to 30-40 °F above the desired
operating temperature and 5-10°F below the Manual
High Limit setting.
Fig. 32: Manual Reset High Limit
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This dual purpose control shuts off the boiler in the
case of a pump failure or low water condition. It is
mounted and wired in series to the main gas valve.
S
tandard on all models except the 133.
% Flow switch will not operate if flow is less
than 12 gpm.
Fig. 33: Flow Switch
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All standard boiler models 181-4001 employ electron-
ic devices which close the main gas valve within 8/10
of a second whenever the pilot flame is interrupted.
Pilot flame is automatically lit when the device is pow-
ered. Unit performs its own safety check and opens
the main valve only after the pilot is proven to be lit.
Fig. 34: Safety Control
Fig. 31: 2-Stage Tankstat