York HP Series Service Manual page 42

the real temperature difference between ceiling and floor so that the unit could run properly. If the height
of installation is lower, smaller value could be chosen.
Range: 6 o C, 4 o C, 2 o C, E function (reserved for special customizing)
D. Micro-switch S1 and dial-switch S2 are for address setting when you want to control this unit by a
central controller.
Range: 00-63
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