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Honeywell Aquastat "creep"?

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Posted by Sue L. on February 16, 2004 at 05:20:51:

I have a gas-fired hot water boiler. The Aquastat control seems to "creep." I had it set to shut off at 185 F. The other day I happened to go to the basement and water was spraying from the pressure relief and the Air-trol, and the system was up around 200 psi, and still firing.

I shut it down, and reset the Aquastat to shut off at 175F. In 2 days, I checked and it was shutting down at 185F. What is wrong? Do I need a new control? This one was installed last November.

Also, what is the Delta T for the Aquastat? The literature says 15 degrees, but since day one mine has shut off at, say, 185 and fired again at 180, a 5 degree delta. Is this wrong?

Thanks,

-Sue

Follow Ups:

Re: Honeywell Aquastat "creep"? Harold hydronicnetwork.net 06:59:50 2/16/2004 (3)
- Re: Honeywell Aquastat Sue L. 08:47:09 2/16/2004 (1)
  - Re: pressure at 35 Harold hydronicnetwork.net 09:51:05 2/16/2004 (0)

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: I have a gas-fired hot water boiler. The Aquastat control seems to "creep." I had it set to shut off at 185 F. The other day I happened to go to the basement and water was spraying from the pressure relief and the Air-trol, and the system was up around 200 psi, and still firing. : I shut it down, and reset the Aquastat to shut off at 175F. In 2 days, I checked and it was shutting down at 185F. What is wrong? Do I need a new control? This one was installed last November. : Also, what is the Delta T for the Aquastat? The literature says 15 degrees, but since day one mine has shut off at, say, 185 and fired again at 180, a 5 degree delta. Is this wrong? : Thanks, : -Sue

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