Aprilaire Model 8570 - Manual (Page 10)

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(4) SET THE CONFIGURATION DIP SWITCHES ON THE THERMOSTAT CIRCUIT BOARD
ON
H/C
GAS
MULTI
6504
HP
ELEC
AHC
SINGLE
Figure 5
There are four dip switches
located on the back of the
thermostat (on the circuit
board) that must be set to
properly configure the
thermostat for operation
with the equipment it is to
control. Figure 5 shows
the default position for the
four switches.