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Posted by Stroback on October 06, 2008 at 07:06:37:
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 control you bypassed has another purpose. That is to maintain a minimum water temperature in the boiler when the thermostat is not calling for heat. Without this in service, the water temperature will drop to room temperature unless the thermostat calls for heat. This will create delay problems with your heating system since most water systems are designed to work best with water temperatures above 140 F. The way you have wired the control, the circulator will start every time the burner starts regardless of the water temperature. I would suggest reconnecting the wire to the R terminal and setting the low limit temperature to about 120 F to limit the delay in your heating system response.