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12
SELECTING~HE DESIRED OPERATING
DISPLAY
(Optional)
. PRESENT TIME and ROQM TEMPERATURE keys
allow you to select c@tinuous display of time or
temperature. respectively.
•~ If neither key is pressed, T7400 will automatically
revert to a display of,,present time within 2
minutes of the last keypress.
PROBLEM INDICATORS
Loss of Stored Program
l
Blinking display of 3 dashes (- -) indicates 10%
of stored program. (Three steady dashes
represent an occupied or unoccupied time slot
that is not programmed.)
TEMPORARILY OVERRIDING THE
17400’s PROGRAM
(optional)
l
3 HOUR OCCUPIED key allows you to <activate
the temperature set points programmed for
your building’s occupied period for 3 hours.
l
‘Once pressed. the 3 HOUR OCCUPIED key can
be pressed again to cancel this command,
and return the T7400 to program control.
l
CONTINUOUS UNOCCUPIED key allows you to
activate the temperature set points
programmed for your building’s unoccupied
period for an indefinite time.
l
T7400 will default to Occupied mode and
control to respective Heat, Economizer. and
Cool set points of 68 F. 72 F, and 78 F until
thermostat is reprogrammed.
LOSS Of External Power
l
Blinking display of time or temperature
indicates loss of external power. The backup
botteiy maintains your time and temperature
schedule during the power loss.
l
Keyboard and red indicator lights exe
inoperative while the 77400 is on batteN power
Failure of Temperature Sensor
. While in the ROOM TEMP display mode. 0
display of (- “) indicates failure of wiring or
the temperature sensor.
. System will safely deenergize all heating and
cooling stages if cI sensor failure occurs.
l Once
pressed. the CONTINUOUS UNOCCUPIED
key must be pressed again to cancel this
command, and return the 17400 to piogiam
control.
l
The 3.HOUROCCUPIED and
CONTINUOUS UNOCCUPIED keys cannot be
used at the same tir&The last key pressed will
be in control.
l
Red indicators near the display window show
when 3 HOUR OCCUPIED and
CONTINUOUS UNOCCUPIED ovenide
functions are activated.
13
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