Heat Controller REG-253H - Manual (Page 9)

Heat Controller, Inc. Room Air Conditioner with R-410A Owner’s Manual
8
AIR CONDITIONER FEATURES (CONTINUED)
TIMER: AUTO START/STOP FEATURE
Press or hold the Temp/Timer UP or DOWN button to
change the Auto time by 0.5 hour increments, up to 10
hours, then count down the time remaining until start.