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When the unit is powered on after replacing the board, the display will show “P1”. Press the
up pad (+) button until the display shows “P3” for engineering digit 5 models. Press the red
“Aux” button to save and exit, then verify proper operation.
Switch
S501-4
ON: Make up air module equipped
Switch
S502-3 and S502-4
Are currently not used
Switch
S502-2
ON: 265V model only Outlet Air
Thermistor equipped - locate on the
louver assembly
Switch
S502-1
ON: Heat pipe equipped
Switch
S501-2 S502-3
15k BTU OFF OFF
12k BTU ON OFF
9k BTU OFF ON
7k BTU ON ON
Switch
S502-1
ON: AZ45
OFF: AZ65
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