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Mode of Operation
The Daikin 668811101 thermostat is a programmable, auto changeover, single stage heat, single stage cool
thermostat. It functions with air conditioning, heat pumps, gas, oil or electric heat systems.
The thermostat activates the heating appliance when the room temperature is below the set heat temperature (by
the differential temperature) and the red indicator light on the thermostat will light. The Daikin 668811101 thermostat
will stop outputting and the red light will turn off when the call for heat has been satisfied. With heat pumps, the
thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your compressor.
When the room temperature is greater than the set cool temperature (by the differential temperature), the cooling
device is activated and the green indicator light on the thermostat will turn on. The Daikin 668811101 thermostat will
stop outputting and the green light will turn off when the call for cooling is satisfied. The thermostat will not let the
compressor come on for 4 minutes after it turns off. This protects your compressor.
The Daikin 668811101 thermostat has five possible operating modes: OFF, Heat, Cool, Heat & Cool and Program
mode. In off mode, the thermostat will not turn on heating or cooling devices. The manual fan can be turned on in
all operating modes using the fan switch and the fan speed can be set in all operating modes using the fan speed
switch. In heat mode, the thermostat controls the heating system. In the Cool mode, the thermostat controls the
cooling system. In heat & cool mode, the thermostat controls both the heating and cooling systems. In program
mode, the thermostat will automatically be controlled by the set program. Program mode can function with heat
mode, cool mode or heat & cool mode. The clock display alternates with the set temperature display for heat & cool
mode.
The program schedule can be overridden by changing the set temperature (
668811101 thermostat thermostat into a 2 hour temporary hold. After 2 hours, it will automatically return to the
program schedule.
The Daikin 668811101 thermostat also has a button lockout feature. This enables the thermostat to be set to the
proper mode and temperature and locked so it cannot be tampered with.
Operating Modes
There are six possible operating modes for the Daikin 668811101 thermostat. Off, Cool, Heat, and Cool & Heat modes
are accessed by pressing the Mode button. Program mode is accessed by pressing the Prog button. Continuous fan
mode is accessed by setting the auto/on switch to ON.
OFF Mode
• In this mode, the thermostat will not turn on the heat pump.
Continuous Fan Mode
• The indoor fan can be turned on manually in every operating mode by sliding the auto/on switch to ON.
Cool Mode
• In this mode, the thermostat controls the cooling system
Note: There is a four minute delay for your compressor to restart after it has turned off.
Heat Mode
• In this mode, the thermostat controls the heating system
Note: For heat pumps, there is a four minute delay for your compressor to restart after
it has turned off.
Cool and Heat Mode (Auto Changeover)
controls the cooling and heating systems, automatically changing over from one to the other
as needed.
Program Mode
– In this mode, the program function is on (PROG displays), and the
thermostat will automatically be controlled by the set program schedule. Program mode can
function with heat mode, cool mode or heat & cool mode. The program schedule can be
overridden by changing the set temperature (
schedule will automatically be resumed. To manually return to the program schedule, press
the PROG button twice.
Setting the Time and Day of the Week
The time and day of the week must be set for your program schedule to operate correctly.
1. Press the MODE button until you are in the OFF mode.
2. Press the PROG button in for 6 seconds. Time displays.
3. Press the
or
button to adjust the time.
4. Press the PROG button while the time is displayed. The display shows the day
currently set on the thermostat (1=Monday, 2=Tuesday, etc).
5. Press the
or
button to set the correct day of the week that today is.
Note: Press the PROG button in for 5 seconds to lock values into memory
and return to the OFF mode or press the PROG button once to enter
programming.
Programming
Program Overview
The Daikin 668811101 thermostat programmable thermostat has four periods (MORN, DAY, EVE, NITE) that are
customizable for each day of the week. Each period will have a start time, heat temperature, and cool temperature.
The Daikin 668811101 thermostat monitors the day and time, while maintaining the specific conditions you have
chosen for each period in your program.
1. Press the MODE button until you are in the OFF mode.
2. Press the PROG button for 6 seconds.
3. Press the PROG button twice.
• Day is displayed (1-7)
4. Press the
or
button to change the day you want to program
(1=Monday, 2=Tuesday, etc.).
5. Press the PROG button to advance to the next screen.
Note: You can always press the MODE button to return to the
previous parameter.
• Period is displayed (MORN, DAY, EVE, NITE)
6. Press the
or
button to change period of day.
7. Press the PROG button to advance to the next screen.
• Set time is displayed
8. Press the
or
button to change set time.
9. Press the PROG button to advance to the next screen.
Note: Transitions required after 11:59 PM must be programmed in the next day's
MORN transition.
• Heat temperature is displayed (45°F to 90°F)
10. Press the
or
button to adjust heat set temperature.
11. Press the PROG button to advance to the next screen.
• Cool temperature is displayed (45°F to 90°F)
Note: Cool cannot be set lower than heat temperature.
12. Press the
or
button to adjust cool set temperature.
13. Press the PROG button to advance to the next screen.
Repeat steps 1-13 to program each day of the week individually or use the Simpleset
feature to program every day the same as Monday.
When programming is complete, press and hold the PROG button in for 5 seconds to return to the OFF mode.
PROG must display on the screen for the thermostat to follow the program schedule. If PROG does not appear,
press the PROG button until PROG displays.
or
button). This puts the Daikin
– In this mode, the thermostat
or
button). After 2 hours, the program
®
Simpleset® Programming
Simpleset
programming is a convenient method of programming the thermostat. Once the entire Monday (Day 1)
®
schedule is set, Simpleset
®
programming will copy the Monday schedule to every day of the week.
After the complete Monday schedule is set (see Programming), you are at the Day 2 screen:
1. Press the
button once. Day 1 screen displays.
2. Press and hold the
button for 3 seconds.
• The days of the week will count down from 7 to 1 and this will lock the
settings into memory.
• Once the schedule is locked in, you can go through each day and make
any changes you require. This feature speeds up the programming of
the standard weekday/weekend schedule.
3. Press and hold the PROG button for 5 seconds to exit program mode and return to the OFF mode.
Lockout Function
The Daikin 668811101 thermostat thermostat has a button lockout feature so the settings cannot be
changed or tampered with. With the lockout activated, any button press will result in "LOC" being displayed.
To activate the LOC function:
1. Press the MODE button and hold it in.
2. Also press the PROG button and keep both depressed for 10 seconds.
3. LOC will display and all buttons will be disabled.
To deactivate the LOC feature, repeat steps 1 & 2 above.
Factory Preprogramming
The Daikin 668811101 thermostat comes preprogrammed with the following schedule:
MORN
6:00 AM
DAY
MONDAY
thru
HEAT
70°F
HEAT
SUNDAY
COOL
78°F
COOL
Personal Program Schedule
Use the following personal program schedule to record your settings:
MONDAY
MORN
DAY
1
HEAT
HEAT
COOL
COOL
TUESDAY
MORN
DAY
2
HEAT
HEAT
COOL
COOL
WEDNESDAY
MORN
DAY
3
HEAT
HEAT
COOL
COOL
THURSDAY
MORN
DAY
4
HEAT
HEAT
COOL
COOL
FRIDAY
MORN
DAY
5
HEAT
HEAT
COOL
COOL
SATURDAY
MORN
DAY
6
HEAT
HEAT
COOL
COOL
SUNDAY
MORN
DAY
7
HEAT
HEAT
COOL
COOL
Troubleshooting
Symptom
No display
Check for 24 VAC at thermostat; display is blank when 24 VAC is not
present
System fan does not come on properly
Verify wiring is correct
All thermostat buttons are inoperative
Verify 24 VAC is present; unit locks out when 24 VAC is not present
No response with first button press
First button press activates backlight only
Program schedule activates at the wrong
Check time (AM/PM) set on thermostat (see "Setting the Time")
time
Thermostat turns on and off too frequently
Adjust temperature differential (see "Configuration Mode Setting 2")
Thermostat does not follow program
Verify it is operating in program mode (PROG displays); check time
(AM/PM); check if in 2 hour program override
Fan runs continuously
Check Fan On/Auto switch, fan runs continuously in On position
Status indicator light not on during call
Turn status indicator function on
(see "Configuration Mode Setting 10")
Room temperature is not correct
Calibrate thermostat (see "Configuration Mode Setting 8").
If remote sensor is used, check S1 and S2 terminal connections
LOC displays when any button is pressed
Thermostat has the button lockout function activated (see "Lockout
Function")
– – on display instead of room temperature
Check for a bad connection at S1 and S2 terminals, if used
Problem not listed above
Press Reset button once*
* Reset Button Function: Time, day and mode changed to last saved settings (saved after power loss or when
exiting program setup), configuration and program settings are unchanged.
Daikin Training and Development
Now that you have made an investment in modern, efficient Daikin equipment, its care should be a high priority. For
training information on all Daikin HVAC products, please visit us at www.DaikinApplied.com and click on Training,
or call 540-248-9646 and ask for the Training Department.
Warranty
All Daikin equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product
Warranty. Consult your local Daikin Representative for warranty details. Refer to Form 933-430285Y. To find your
local Daikin Representative, go to www.DaikinApplied.com.
Aftermarket Services
To find your local parts office, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787). To find your
local service office, visit www.DaikinApplied.com or call 800-432-1342. This document contains the most current
product information as of this printing. For the most up-to-date product information, please go to
www.DaikinApplied.com.
Products manufactured in an ISO certified facility.
06-30-15
8:00 AM
EVE
6:00 PM
NITE
62°F
HEAT
70°F
HEAT
85°F
COOL
78°F
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
EVE
NITE
HEAT
HEAT
COOL
COOL
Remedy
10:00 PM
62°F
82°F
LIAF015-2
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