Normal Operation
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DO NOT set to 185 °F if you use your water heater in a recirculation
system. This will cause damage to the heater and void the warranty. (This
temperature setting is only available on the 510 (T-D2) models.)
DO NOT adjust the left bank of dipswitches. For the 510 (T-D2) models.
Turn off the power supply to the water heater before changing the
dipswitch settings.
Only change the switches with the dark squares. The dark squares indicate
which direction the dipswitch should be set to.