White Rodgers 90 User Manual
Page 21
19
Thermostat Startup After Total
Power Loss.
On installation, or when power is
restored after a total power loss to the
thermostat, your thermostat will
automatically maintain a heating
temperature of 62
°
F (16
°
C) and a
cooling temperature of 85
°
F (29
°
C).
If the 24 volts from the Heating/
Cooling transformer is lost, your
thermostat will lose its display in 2
minutes and may lose time in about 6
hours. This hold up time will be much
shorter if the control had not been
powered for at least 4 hours prior to
the power outage. When power is
restored, the thermostat will return to
the temperatures listed above.
If this happens, set the clock and day
of the week (use PROGRAMMING
steps 1 through 6 from “Entering
Your Program” page 7), then select
HEAT, EMER, COOL
or
AUTO
using the
SYSTEM
key, and press
PROGRAM
RUN
to resume
operation with your previously set
program.