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Aguastat adjustment/replacement

Have American Radiator Company Ideal #7 coal converted to oil furnace. Had it serviced for winter and was told it has been "straight wired" so that the circulator pump will run continually. I cannot have this pump running all winter.

Have been reading up on aguastats. It seems the lower limit is the problem and it should be reset. How do I do this safely?

Re: Aguastat adjustment/replacement

If you have a circulator and aquastat you have a BOILER there & not a furnace.

Could you advise what is the model number and make of the aquastat??

It's usually a gray box 4" high and 6" long somewhere on the center of the boiler.

On some older boilers converted from coal the aquastat has little levers on a little metal scale in the center of the boiler to adjust the water temp.

Do the 2 little wires coming from the room thermostat (usually red & white) go into the aquastat, and are they connected to the TT terminals???

If the circulator is running now, it may be hard wired to the 120v voltage supply instead of going into the aquastat & will have to be rewired.

Most aquastat covers have one or two hold-down screws that can be loosened so you can remove the aquastat cover.

Some photos or a diagram of how the circulator is wired would be helpful if you can post them.

Why not call back the person that just serviced the boiler if you have a contract???

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