Operation; Troubleshooting - Honeywell T7200 Owner's Manual

STARTUP
When power is first applied, an internal startup
program begins. This takes place after any total
loss of power (supply voltage and backup battery)
and lasts 2 seconds.
At this time, default temperature setpoint
used for temperature control. These are: heating
68 F [20 C] and cooling 78 F [26 C]. Following the
startup period, you can enter new setpoints which
will be used in place of these default values.
Should a power failure occur after your time and
temperature schedule entries are made, the backup
battery will maintain your schedule up to 60 hours.
As long as either system or battery backup power is
present, your program is available and will be used
for temperature control.
INDICATORS
No Program in Thermostat Memory
A display of 4 dashes (----) indicates that there is no
program stored in the thermostat's memory. This
will occur when power is first applied to the
thermostat, or when power was lost to the thermo-
stat while battery backup was either weak or not
installed.
Loss of External Power
A blank display indicates loss of external power.
The backup battery will maintain your time and
temperature schedule during power loss. The
keyboard and display are inoperative while the
thermostat is operating on battery power.
BATT Displayed on LCD
BATT displayed on LCD indicates backup battery is
weak or not installed. Refer to section titled
BATTERY ACCESS AND REPLACEMENT for
instructions.

OPERATION

SELECTING THE DESIRED OPERATING DISPLAY
The DISPLAY key allows you to select a continuous
display of time or temperature. Each press of the
DISPLAY key will toggle the display between time
values are
or temperature.
Temperature Display of --'
A display of 2 dashes and a degree symbol (--"),
indicates a temperature sensor failure. See section
titled

TROUBLESHOOTING

MINIMUM OPERATION TIMES
The T7200 and T7300 thermostats incorporate
minimum operation times of 2 to 4 minutes. These
times are in effect after startup. anytime power to
the thermostat is removed and then reapplied, or
after heating or cooling goes either on or off. These
time delays will protect and extend the life of your
heating and cooling equipment.
Due to these times, the thermostats will not react
instantaneously to setpolnt changes.
GUIDE for instructions.