Therma-Stor Products Group XT150H - Manual (Page 9)

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The ventilation timer allows six programs with each program
having one “ON” and one “OFF” event. A program allows the
user to turn the ventilation on at a certain day and time, then it
allows them to turn the ventilation off at a certain day and time.
Each of these programs can be repeated daily or weekly or
during a specified block of days. All six of the programs operate
independently of each other. If the timer fails to operate or operates
erratically, check that the control panel receives 24Vac from the
Ultra-Aire XT150H. If 24Vac is present at the control panel, reset
the timer by pressing the reset button at the bottom center of the
timer face. The reset button is the small recessed button with an R
beneath it located below the 1-7 and h buttons. Depress the reset
button until the display clears. Release the reset button. The display
will reappear as 00:00. Resetting the timer will clear the time and
all program settings. After resetting the timer follow the instructions
below to set the correct time and ventilation programs.
4.4A Setting the Time
Set the correct time on the timer by sliding the switch in the upper
right hand corner of the timer to the clock symbol. and pressing the
1-7 (DAY), h (HOUR), and m (MINUTE) buttons. Remember this timer
operates on a 24-hour (military time) clock.
4.4B Ventilation Schedule
Slide the switch in the upper right hand corner to the program
symbol P. “ON” will appear to the right of the time and the number
“1” will appear in the lower right hand corner of the display. The
“1” and “ON” signify the turn on time for the first program. Press
the 1-7, h and m button to choose the days of the week for this
program. You can choose Mon.-Sun., Mon.-Fri., Sat.-Sun., or any
single day of the week. The days chosen are shown along the top
of the display on the ventilation timer. Next press the h button to
set the hour for the start of the ventilation period. Remember this
timer operates on a 24-hour clock (military time). Then press the m
button to set the minutes past the hour to start the ventilation.
Now, with the ventilation start time set; press the I/O button. The
word “OFF” should appear to the right of the time and the number
“1” should remain in the lower right hand corner of the display. The
“1” and “OFF” signify the turn off time for the first program. Set
the turn off time using the 1-7, h and m buttons in the same way
as described above and continue on to the second through sixth
programs. When setting the ventilation programs, you can return
to the current time display by sliding the switch in the upper right
corner of the timer to RUN. The slide switch must be set to RUN for
the timer to operate its scheduled programs.
4.4C Automatic or Manual Mode
The slide switch in the upper left of the timer is used to choose
between automatic and manual operation. When the slide switch
is set to AUTO mode, the Ultra-Aire XT150H will ventilate when
the scheduled programs call for ventilation. When the slide switch
is set to manual (set to hand symbol on the right), the operation
of the timer is controlled by the I/O button only. Pressing the I/O
button will switch the ventilation timer between ON (detent) and
OFF (detent). As you press the I/O button, “ON” or “OFF” will be
displayed to the right of the time. The “ON” or “OFF” indicates if the
ventilation timer is on or off. The I/O button will manually override
scheduled programs if the timer is in AUTO mode.
FOR HVAC INSTALLER ONLY
Ultra-Aire XT150H Installer’s & Owner’s Manual