Carrier SYSTXCCITW01-A Infinity Owner's Manual page 15

Once you have selected the desired activity for ALL ZONES, you will
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have the option to either permanently (HOLD) or temporarily (HOLD
UNTIL) override your programmed schedule.
Selecting the HOLD option will permanently override your pro-
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grammed schedule until you CANCEL ALL ZONES.
Selecting the HOLD UNTIL option will allow you to temporarily
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override your programmed schedule.
Once selected, use the Up (Y) and Down (B) buttons to change the
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time in 15 minute increments.
When the correct time interval is displayed, touch DONE.
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