Bradford White 238-47808-00A Installation And Operation Manual page 38

Setting the Setback
Control Schedule – Initial Set-up
Lock the Sleep Period Start Time
Step 22: Press the RIGHT (Next) button to set the Sleep period start time, which is shown in Figure 69.
Select AM / PM
Step 23: Next, using the UP (index AM / PM) or DOWN (index AM / PM) buttons, select AM / PM, as
shown in Figure 70.
Lock in AM / PM
Step 24: Press the RIGHT (Next) button to lock in AM / PM. This is shown in Figure 71.
Figure 69
Figure 70
Figure 71
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"AM"/"PM" flashes