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Old 11-01-2011, 10:16 PM   #1
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External gauge on supply line?


I have a gas boiler furnace. There is a gauge clamped
to the supply line. It has a dial that is set for 200 degrees.
It also has 2 wires that go to the aquastat. What is that and whats it function?

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Old 11-01-2011, 10:34 PM   #2
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External gauge on supply line?


Sounds like your high limit control. Should be wired in series with your aquastat to turn off the burner if your thermostat were to get stuck in the on position. Acts as a safety that's why it's set to 200, makes sure it cuts off your burner before the water starts to boil in the system.

Your Aquastat is your operating control which is likely set at 160-180?

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Old 11-02-2011, 05:57 AM   #3
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External gauge on supply line?


Yes the aquastat is set to 180. So if its a high limit control switch in series, then it should be normally closed when the temperature of the copper pipe is less than 200, then opens when its 200?

Last edited by draft34; 11-02-2011 at 06:00 AM.
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Old 11-02-2011, 06:30 AM   #4
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External gauge on supply line?


Yes, that is correct
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