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Posted by pete on November 09, 2007 at 09:52:56:
Hi Heatpro, I was looking in my manual,for my peerless boiler and it calls the temp. control a limit switch. I hear people using the term aquastat. Is that another name for the limit switch? Or is that the switch they use on the domestic hot water? I looked at my limit switch on my boiler and it is set at 190 degree. The boiler turns off at 220deg. and if there is heat demand when boiler just heated up it will kick back on at about 185deg. roughly, does that mean when you set these limit switches they have a window they turn on and turn off from the setting you set? This is a honeywell.
My other question is if there is no call for heat from thermostat or from domestic water ever, and the water in the boiler continues to cool on its own, will it kick on to keep water hot in boiler, or could it actually cool to room temp.? If there is never a call of course. I dont see a switch that would allow it to go on for that. I know limit switch does more during heat call to keep boiler hot during circulating. Thanks as always.