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Posted by HeatPro on September 01, 2008 at 01:04:23:
In Reply to: Cancelling the domestic hot water function on a White-Rodgers aquastat posted by Prestigo on August 31, 2008 at 22:30:03:
the burner does never run to heat the internal water heating coil. For that purpose, I have removed the wire from terminal R and have connected it to terminal W, so that currect never reaches terminal B even though RB contacts remain permanently closed. Is that the way to go and will this procedure prserve safely the other functions of the aquastat?
By moving the wire that was on R to W, you make the circuit so power to the circulator is transferred when the circulator relay contact closes with the burner relay contacts from W. The current never goes to the B terminal of the low limit from the R, so the demand for the burner from the low limit contacts is prevented. The RB contacts don't remain permanently closed as they are thermally operated, but they no longer switch current. The control functions safely as a simpler 8B48A high limit/switching relay.
http://www.white-rodgers.com/wrdhom/pdfs/06_Cat_pages/Cat_06_pg0144.pdf