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Old 11-18-2011, 12:27 PM   #1
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Disabling LO setting on boiler


I have an oil boiler with a Honeywell L7224 aquastat. There's a DHW coil installed but I no longer wish to use it, since it was burning up a lot of oil outside of heating season. A 40 gallon electric water heater was installed off of the coil.

Question is, I want to disable the LO setting on the boiler, that existed for the DHW coil. I downloaded the manual, and managed to drop the low down to 110 degrees (as low as it'll go). The only settings I can change are HI, LO, DIFF, and F/C temperature display. I contacted Honeywell and they refuse to give me an information unless I'm a contractor.

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Old 11-18-2011, 02:32 PM   #2
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Disabling LO setting on boiler


You can pull the wire to the LO (it's on a quick disconnect), but you would need to make sure your boiler is cold-start. Mine is, but it's also at least 12 years old and leaked a lot of condensation when I did that. I just leave it at that minimum 110 degree setting now.

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Old 11-18-2011, 03:11 PM   #3
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Disabling LO setting on boiler


I will do that then, thanks. I've been shutting off the boiler all together during the summer. I had the LO at 110 and it didn't fire at all when the hot water was in use, so that should work good.
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