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Configuration Mode Settings
The setup screens for Configuration Mode are as follows:
1. Temperature Scale (F or C)
Choose Fahrenheit or Celsius.
Press the up or down button to select.
Press the right button to advance to the next screen.
2. 1
st
Stage Temperature Differential (1°F to 5°F) (0.5°C to 2.5°C)
Set the number of degrees between your "setpoint" temperature and your "turn on"
temperature.
Press the up or down button to set differential value.
Press the right button to advance to the next screen.
3. 2
nd
Stage Temperature Differential (1°F to 5°F) (0.5°C to 2.5°C)
Set the number of degrees between when stage 1 turns on and when stage 2 turns on.
Press the up or down button to set differential value.
Press the right button to advance to the next screen.
4. Staged Off Outputs
Select whether the outputs for heating and cooling are staged off independently or
are satisfied simultaneously.
1 = outputs staged off independently
0 = outputs off simultaneously
Press the up or down button to set.
Press the right button to advance to the next screen.
5. Minimum Deadband (1°F to 9°F) (1°C to 5°C)
Set the minimum separation between heat setpoint and cool setpoint in Auto
Changeover Mode.
Press the up or down button to set deadband value.
Press the right button to advance to the next screen.
6. Maximum Heat Setpoint (55°F to 90°F) (13°C to 32°C)
Adjust to control the maximum heat set temperature allowed.
Press the up or down button to select.
Press the right button to advance to the next screen.
7. Minimum Cool Setpoint (55°F to 90°F) (13°C to 32°C)
Adjust to control the minimum cool set temperature allowed.
Press the up or down button to select.
Press the right button to advance to the next screen.
8. Room Temperature Offset (+9°F to -9°F) (+4.5°C to -4.5°C)
Adjust to calibrate displayed room temperature to match actual room temperature.
Note: When not set to 0, will display.
Press the up or down button to select.
Press the right button to advance to the next screen.
9. Temperature Sensor (1-3)
1. Only on-board sensor determines room temperature.
2. Only remote sensor determines room temperature.
3. Average temperature of on-board and remote sensor.
Note: If there is no remote sensor, option 1 must be selected.
Press the up or down button to select.
Press the configuration button for two seconds to exit configuration.
Mode of Operation
The 910121746 is a non-programmable, manual or auto changeover, 2-stage heat, 2-stage cool thermostat. An
outdoor sensor can be used to monitor the outdoor temperature.
The thermostat activates the heating appliance when the room temperature is below the set heat temperature (by
the differential temperature). The 910121746 will stop outputting when the call for heat has been satisfied.
When the room temperature is greater than the set cool temperature (by the differential temperature), the cooling
device is activated. The 910121746 will stop outputting when the call for cooling is satisfied.
The 910121746 has four possible operating modes: OFF, Heat, Cool and Heat & Cool 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 button. 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.
Pressing the UP and DOWN buttons simultaneously for 2 seconds then releasing them causes the thermostat to
output from the "O" terminal for 5 seconds. " Or" will show on the display. This will result in the unit going into a night
set-back override.
Pressing the UP and DOWN buttons simultaneously for 5 seconds causes the thermostat to output from the "O"
terminal for 10 seconds. " rS" will show on the display. This will result in the unit being reset.
Button Functions
UP
– Used to increase the time, set temperatures and to adjust configuration
settings.
DOWN
– Used to decrease the time, set temperatures and to adjust
configuration settings.
SYS (left)
– Used to change from OFF, HEAT, COOL and AUTO changeover
modes
FAN (right)
– Used to turn on and off the indoor fan.
DOWN and SYS
– Pressed simultaneously to display outdoor remote temperature if remote sensor is
connected.
UP and DOWN
– Used to override night set back or reset the unit.
There are five possible operating modes for the 910121746. Off, Cool, Heat, and Cool & Heat modes are accessed
by pressing the SYS (left) button. Program mode is accessed by pressing the SYS (left) and FAN (right) buttons
simultaneously.
OFF Mode
• In this mode, the thermostat will not turn on the heating or cooling devices
Heat Mode
• In this mode, the thermostat controls the heating system. When the heat outputs,
the flame icon apprears on the display.
Cool Mode
• In this mode, the thermostat controls the cooling system. When the cooling
outputs, the snowflake icon apprears on the display.
Cool and Heat Mode (Auto Changeover)
• In this mode, the thermostat controls the cooling and heating systems, automatically
changing over from one to the other as needed.
• The timing display alternates with the set temperature every 10 seconds in the cool
and heat mode.
Once the thermostat is configured, it should be thoroughly tested.
Heat Test
1. Press SYS (left) button until heat mode is displayed.
2. Adjust the set temperature so it is 5 degrees above the room temperature.
3. Heat should come on within a few seconds.
4. Adjust the set temperature 2 degrees below the room temperature and the heat
should turn off. There may be a fan delay on your system.
Cool Test
1. Press SYS (left) button until cool mode is displayed.
2. Adjust set temperature so it is 5 degrees below room temperature.
3. A/C should come on within a few seconds.
4. Adjust the set temperature 2 degrees above the room temperature and the A/C
should turn off. There may be a fan delay on your system.
Fan Test
1. Press FAN (right) button. Fan displays. Indoor fan turns ON.
2. Press FAN (right) button. Indoor fan turns OFF.
No display
All thermostat buttons are inoperative
No response with first button press
Thermostat turns on and off too
frequently
Fan runs continuously
Status indicator on
Room temperature is not correct
Heat or Cool not coming on
Alarm light on
Problem not listed above
* Reset Button Function: Display is refreshed and configuration settings are unchanged.
Up
button
Down
button
FAN
SYStem
(right)
(left)
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.
10-15-13
Operating Modes
Note: The indoor fan can be turned on manually in every operating mode by
pressing the FAN (right) button. The word FAN shows on the display and
the fan icon
appears when the fan operates.
Testing the Thermostat
CAUTION!: Do not energize the air conditioning system when the outdoor temperature is below 50
degrees. It can result in equipment damage or personal injury.
Troubleshooting
Symptom
Check for 24 VAC at thermostat; display is blank when 24 VAC is not
present
Verify 24 VAC is present; unit locks out when 24 VAC is not present
First button press activates backlight only
Adjust temperature differential (see Configuration Mode Settings 2 & 3)
Press FAN (right) button to turn fan off
WSHP status blink code
Calibrate thermostat (see Configuration Mode Setting 8)
If remote sensor is used, check S1 and S2 terminal connections
on display instead of room
Check for a bad connection at S1 and S2 terminals, if used
temperature
(see Configuration Mode Setting 9)
Verify wiring is correct, gently pull on each wire to verify there is a good
connection at terminal block
Unit in alarm lockout condition
Press Reset button once*
OFF
OFF
Remedy
LIAF179-1
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