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T8665A CHRONOTHERM® IV DELUXE PROGRAMMABLE WIRELESS THERMOSTAT
69-1535-3 4
5. Attach the zone number stickers, included with the
thermostat, onto the thermostat case on the inside
of the thermostat cover. See Fig. 5.
Fig. 5. Zone stickers included with T8665A
Thermostat.
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. 6. 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. 6. Thermostat System and Fan key locations.
NOTE: Always press the keys with your fingertip or sim-
ilar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.
Programmed 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
Owner’s Guide for complete instructions on changing the
program.
Table 2. Default Program Settings.
Place one label inside
each thermostat door.
Zone 1
Zone 2
Zone 3
M1342
6
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