T8624D CHRONOTHERM
®
IV DELUXE PROGRAMMABLE MULTISTAGE THERMOSTATS
69-1412—1
4
Fig. 6. T8624D key locations and descriptions.
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 System Test,
• display outdoor temperature (select models),
• set the system operation,
• set the fan operation.
See Fig. 6 for the location of the keys.
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. 7. The fan settings can be set for
each program period individually. The system selection is
for all the program periods.
System settings control the thermostat operation as
follows:
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
Fig. 7. T8624D System and Fan key locations.
NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen
or pencil point can damage the keyboard.
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. The fan setting
feature is available on select thermostat models. See
Owners Guide, form number 69-0940, for complete
instructions on changing the program.
Table 2. Default Program Settings.
M14624
Time
Set Program
System
Fan
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 OPTIONS
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
INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER SETUP
AND 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
SELECT SYSTEM
OPERATION
SELECT FAN
OPERATION
Period
Time
Heat
Setpoint
Cool
Setpoint
Fan
Setting
Wake
6:00 AM 70°F
(21°C)
78°F
(25.5°C)
Auto
Leave
8:00 AM 62°F
(16.5°C)
85°F
(29.5°C)
Auto
Return 6:00 PM 70°F
(21°C)
78°F
(25.5°C)
Auto
Sleep
10:00 PM 62°F
(16.5°C)
82°F
(28°C)
Auto
M14625
Hold Temp
Run
Program
Copy
Daylight
Time
Set Current
Day/Time
System
Fan
Time
Set Program
Day
System
Fan
Wake
Leave
Return
Sleep
Heat/Cool
Settings
