T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
69-1670 4

Using Thermostat Keys

The thermostat keys are used to:
• set current day and time,
• program times and setpoints for heating and cooling,
• temporarily override program temperatures,
• display present setting,
• configure Installer Setup,
• check Self-Test,
• display outdoor temperature (select models),
See Fig. 9 for location of the keys.
NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen
or pencil point can damage the keyboard.
Fig. 9. T8602D key locations and descriptions.
SETTINGS

System and Fan Settings

The system default setting is Heat and the fan default
setting is Auto. Use the System and Fan keys to change
the settings. See Fig. 10.
System settings control the thermostat operation:
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Fan settings control the system fan:
On: Fan operates continuously.
Auto: Fan operates with equipment.
Fig. 10. Thermostat System and Fan key locations.

Temperature Settings

Refer to Table 2 for the default program. If the daytime
energy savings period is not used, press the period key
(Leave or Return) until the time is blank. See Owner’s
Guide for complete instructions on changing the
program.
Table 2. Default Program Settings.
M14880
Time Set Program
System
Fan
On Auto
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
INCREASE TEMPERATURE
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP OPTIONS
DECREASE TEMPERATURE
SETTING OR SCROLL
BACKWARD THROUGH
INSTALLER SETUP OPTION
S
DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE
RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE
SET CURRENT
DAY AND TIME
SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
I
NCREASE TIME SETTING
O
R SCROLL FORWARD
T
HROUGH INSTALLER SETUP
A
ND SYSTEM TEST
DECREASE TIME SETTING OR
SCROLL BACKWARD THROUGH
INSTALLER SETUP AND SYSTEM TEST
COPY ONE PROGRAMMED
DAY TO ANOTHER DAY
SET WAKE TIMES
AND SETPOINTS
CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
SET LEAVE TIMES
AND SETPOINTS SET RETURN TIMES
AND SETPOINTS
SET SLEEP TIMES
AND SETPOINTS
SYSTEM SWITCH
FAN SWITCH
Off CoolHeat
M14881
Hold Temp
Run
Program
Copy
Daylight
Time
Set Current
Day/Time
Time Set Program
Day
Wake Leave Return Sleep
Heat/Cool
Settings System
Fan
On Auto
Off CoolHeat
System
Fan
On Auto
Off Coo
l
Heat
Period Time Heat Setpoint Cool Setpoint
Wake 6:00 AM 70°F
(21°C)
78°F
(25.5°C)
Leave 8:00AM 62°F
(16.5°C)
85°F
(29.5°C)
Return 5:00 PM 70°F
(21°C)
78°F
(25.5°C)
Sleep 10:00 PM 62°F
(16.5°C)
82°F
(28°C)