Bradford White 238-47808-00A Installation And Operation Manual page 36

Setting the Setback
Control Schedule – Initial Set-up
Lock in Return Period Start Time
Step 16: Press the RIGHT (Next) button to set the Return period start time, which is shown in Figure 63.
Select AM / PM
Step 17: Next, using the UP (index AM / PM) or DOWN (index AM / PM) buttons, select AM / PM, as
shown in Figure 64.
Lock in AM / PM
Step 18: Press the RIGHT (Next) button to lock in AM / PM. This is shown in Figure 65.
Figure 63
Figure 64
Figure 65
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"AM"/"PM" flashes