How to Set the Oil Burner Differential on a Honeywell Controller

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The Honeywell Aquastat Controller maintains your hot-water heater at optimum temperature, maintaining hot water without continuous heating. At the high-limit setting, the boiler turns off and maintains the hot water; when the water reaches the low-limit setting, the boiler turns on and reheats the water until it reaches the high limit. The differential at both settings should be 10 degrees F to 25 degrees F below the limit setting and turns the heating on and off without the water having to reach its highest or lowest permissible temperature, keeping the water within a comfortable range.

  • Press the "Up" arrow, "Down" arrow and "I" all at once and hold for three seconds.

  • Press the "I" button until "LL" (lower limit) signal appears on the screen. Press "Down" arrow until it reads "Off." This allows you to reset any temperature settings.

  • Press "I" and the "Up" and "Down" arrows at the same time and hold for three seconds. This enters the adjustment mode; the procedure is meant to protect your stored settings.

  • Press "I" repeatedly until the setting you want to change appears. This can be "Hdf" for high limit differential or "Ldf" for low limit differential. The current temperature setting will be displayed as well.

  • Press "Up" or "Down" arrow to change the temperature setting.

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