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TEMPERATURE SETTINGS ON THE PCB
WITHOUT CONTROLLER
There are two preset temperatures, 120 °F (50 °C) and 140 °F (60 °C), that you can select by changing the
DIP switch settings on the computer board without the controller. See the table below.
When the controller is in normal operation, the set temperature of the controller is given priority over the
set temperature of the DIP switch settings.
NOTE: The tables above show the correct DIP switch position for each temperature setting.
IN/OS), only adjust DIP switch No. 9. For the 510U (AT-D3U-IN/OS), only adjust DIP switch
No. 5 on the lower bank. Do not adjust the other DIP switches for temperature adjustment.
WARNING
DO NOT adjust the upper bank of DIP switches for the 510U (AT-D3U-IN/OS).
Turn off the power supply to the water heater before changing the DIP switch
settings.
The temperature has been preset at the factory to 120 °F (50 °C).
DIP switches
Computer board
110U (AT-KJr3U-IN/OS)and 310U (AT-K5U-IN/OS)
120 °F (50 °C)
DEFAULT
140 °F (60 °C)
No. 9 : OFF
No. 9 : ON
ON
ON
Lower bank of
DIP switches
Computer board
Upper bank of
DIP switches
(Lower bank of DIP switches)
120 °F (50 °C)
DEFAULT
140 °F (60 °C)
No. 5 : OFF No. 5 : ON
510U (AT-D3U-IN/OS)
ON
ON
Normal Operaon
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