Daikin 910121748 - Programmable Electronic Thermostat Manual

Features

• 7-Day, 5-2-Day or 5-1-1-Day Programmable
• Configurable
• 2-Stage Heat/2-Stage Cool Systems
• Large Display With Backlight
• Selectable Fahrenheit or Celsius
• Status Indicator Light
• Relay Outputs
  (minimum voltage drop in thermostat)
• Remote Sensor Compatible

Parts Diagram

Icon Descriptions

Specifications

Electrical rating:

• 24 VAC (18-30 VAC)
• 1 amp maximum per terminal
• 3 amp maximum total load

Temperature control range: 55°F to 90°F (13°C to 32°C)
Accuracy: ± 1°F (± 0.5°C)
System configurations: 2-stage heat, 2-stage cool
Timing:
Anti-short Cycle: 4 minutes (bypass anti-short cycle delay by returning to OFF mode for 5 seconds)
Backlight Operation: 10 seconds
Terminations: A, L, S1, S2, R, C, W1, Y1, W2, Y2, G, O

Important Safety Information

Always turn off power at the main power supply before installing, cleaning, or removing thermostat.

• This thermostat is for 24 VAC applications only; do not use on voltages over 30 VAC
• All wiring must conform to local and national electrical and building codes
• Do not use air conditioning when the outdoor temperature is below 50 degrees; this can damage your A/C system and cause personal injuries
• Use this thermostat only as described in this manual

Package Contents/Tools Required

Package includes: 910121748 thermostat on base, thermostat cover, wiring labels, screws and wall anchors, Installation, Operation and Application Guide
Tools required for installation: Drill with 3/16" bit, hammer, screwdriver

To Remove Existing Thermostat

ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.
2. Remove cover of old thermostat. This should expose the wires.
3. Label the existing wires with the enclosed wire labels before removing wires.
4. After labeling wires, remove wires from wire terminals.
5. Remove existing thermostat base from wall.
6. Refer to the following section for instructions on how to install this thermostat.

To Install the Device

ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

Thermostat installation must conform to local and national building and electrical codes and ordinances.

Note: Mount the thermostat about five feet above the floor. Do not mount the thermostat on an outside wall, in direct sunlight, behind a door, or in an area affected by a vent or duct.

1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.
2. To remove cover, pull gently at the seam at the top.
3. Put thermostat base against the wall where you plan to mount it (Be sure wires will feed through the wire opening in the base of the thermostat).
4. Mark the placement of the mounting holes.
5. Set thermostat base and cover away from working area.
6. Using a 3/16" drill bit, drill holes in the places you have marked for mounting.
7. Use a hammer to tap supplied anchors in mounting holes.
8. Align thermostat base with mounting holes and feed the control wires through slit in thermal intrusion barrier and into wire opening.
9. Use supplied screws to mount thermostat base to wall.
10. Insert stripped, labeled wires in matching wire terminals.
    
    Be sure exposed portion of wires does not touch other wires.
11. Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper terminal.
12. Turn on power to the system at the main service panel.
13. Configure thermostat to match the type of system you have.
14. Replace cover on thermostat by snapping it in place.
15. Test thermostat operation as described in "Testing the Thermostat".

Wiring Diagrams

WSHP Main Control Board Terminals TB1 and TB2

Remote Sensor Installation (Optional)

Terminals S1 and S2 can be used for an indoor remote sensor.
The indoor remote sensor is used to read the indoor temperature in a different location. This is beneficial when the thermostat is not mounted in the ideal location. The remote sensor P/N is 910116773.

1. Remove cover from remote sensor housing.
2. Select an appropriate location for mounting the remote sensor.
3. Mount remote sensor unit using hardware provided.
4. Install two strand shielded wire between remote sensor and thermostat. Shielded wire is recommended.
   Do not run remote sensor wire in conduit with other wires.
   

• Wire 1 should run between the S1 terminal on the thermostat and the S1 terminal on the remote sensor
• Wire 2 should run between the S2 terminal on the thermostat and the S2 terminal on the remote sensor
• Connect the shielding of the wire to the S2 terminal on the thermostat

5. Configure the thermostat to operate with the remote indoor sensor (see Configuration Mode setting 9).

Remote Sensor:
(Contact Daikin for optional remote sensor.)

Note: Remote or outdoor sensor reading can be displayed by simultaneously pressing the Down and SYS buttons.

Terminal Designator Descriptions

R – 24 VAC hot
C – 24 VAC common

W 1 – 1st stage heat
Y 1 – 1st stage cool

W 2 – 2nd stage heat
Y 2 – 2nd stage cool

G – Fan
A – Alarm input

L – Status input
O – Override/reset

910121748 Output Chart

	1ST Cool	2ND Cool	1ST Heat	2ND Heat
Heat/Cool	Y1	YI, Y2	W1	W1, W2

The 910121748 thermostat is configurable for all systems. The configuration directly affects the outputs.
Use the output chart to correctly configure and wire the thermostat to your system.

Configuration Mode

The configuration mode is used to set the 910121748 to match your heating/cooling system. To configure the 910121748, perform the following steps:

1. Verify the 910121748 is in the OFF mode.
   Press the SYS (left) button until off mode displays.
   
2. Remove the cover of the thermostat by gently pulling near one of the corners at the top of the thermostat.
3. Press the CONFIG button for 1 second while the 910121748 is in OFF mode.
   

Press the up or down button to change settings within each screen.

Press the right button to advance to the next screen.
Note: Pressing the left button will return you to the previous screen.

To exit configuration mode, press the CONFIG switch for 1 second.

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. 1st 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. 2nd 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 (1-4)
   1. Only on-board sensor determines room temperature.
   2. Only remote sensor determines room temperature.
   3. Average temperature of on-board and remote sensor.
   4. Only on-board sensor will be used until NITE period, and then only remote sensor is used.
      

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 910121748 is a 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 910121748 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 910121748 will stop outputting when the call for cooling is satisfied.

The 910121748 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 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. 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 (up or down button). This puts the 910121748 thermostat into a 2-hour temporary hold. After 2 hours, it will automatically return to the program schedule.

The programmable fan feature can be used to recirculate air while in Program mode. It is activated during the program schedule set up.

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.
PROG (SYS and FAN) – Used to change from program operation to manual operation.
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.

Operating Modes

There are five possible operating modes for the 910121748. 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
  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.
  

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.
  

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 (up or down button). After 2 hours, the program schedule will automatically be resumed. To manually return to the program schedule, press the PROG button twice.
  

Testing the Device

Once the thermostat is configured, it should be thoroughly tested.

Do not energize the air conditioning system when the outdoor temperature is below 50 degrees. It can result in equipment damage or personal injury.

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.

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 SYS (left) button until you are in the OFF mode.
2. Press and hold the PROG button (SYS (left) and FAN (right) buttons pressed simultaneously) in for 6 seconds.
3. Time displays (hour flashing).
   Press the up or down button to adjust the hour.
   
4. Press the FAN (right) button once to select minutes (minutes flashing).
   Press the up or down button to adjust the minutes.
   
5. Press the FAN (right) button once to select day of the week (TODAY flashing).
   Press the up or down button to select current day of the week.
   
   Note: At any time, press the SYS (left) button to return to the previous screen or press the FAN (right) button to advance to the next screen.

Press the PROG button in for 2 seconds to lock values into memory and return to the OFF mode or press the FAN (right) button once to enter programming.

Programming

Program Overview
The 910121748 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, cool temperature and programmable fan option. The 910121748 monitors the day and time, while maintaining the specific conditions you have chosen for each period in your program.

Setting the program schedule:

1. Press the SYS (left) button until you are in OFF mode.
2. Press and hold the PROG button (SYS and FAN buttons pressed simultaneously) for 6 seconds.
   
3. Press the FAN (right) button 3 times.
4. SUN thru SAT are blinking.

From this screen you have 2 options:

1. Press the FAN (right) button to begin programming all 7 days at one time, or
2. Press the up button to see the other programming options.
   Note: The days of the week shown on the display will be programmed simultaneously. The screens are listed below.
   

Screen 1	SUN	MON	TUE	WED	THU	FRI	SAT
Screen 2		MON	TUE	WED	THU	FRI
Screen 3		MON
Screen 4			TUE
Screen 5				WED
Screen 6					THU
Screen 7						FRI
Screen 8	SUN						SAT
Screen 9							SAT
Screen 10	SUN

From any of the screens on above, you can press the FAN (right) button to begin entering your program schedule. The days shown on the display will all be programmed simultaneously.

Once the FAN (right) button is pressed, MORN blinks.
Use the up or down button to select a different period (MORN, DAY, EVE, NITE).

Press FAN (right) button to advance to the next screen. Transition time hour blinks.
Use the up or down button to select a different hour.

Press FAN (right) button to advance to the next screen. Transition time minutes blink.
Use the up or down button to select different minutes.

Press FAN (right) button to advance to the next screen. Heat set temperature displays.
Use the up or down button to adjust the heat set temperature.

Press FAN (right) button to advance to the next screen. Cool set temperature displays.
Use the up or down button to adjust the cool set temperature.

Press FAN (right) button to advance to the next screen. Programmable fan screen displays.
Use the up or down button to select:

Choose:
Off – Programmable fan disabled
On – Indoor fan on continuously
Note: Programmable fan operates in Program mode only.

Repeat above steps to program the four periods per day.

When the program schedule is complete, press and hold the PROG button (SYS and FAN buttons pressed simultaneously) in for 2 seconds to return to the OFF mode.

Factory Preprogramming

The 910121748 comes preprogrammed with the following schedule:

MONDAY thru SUNDAY	MORN	6:00 AM	DAY	8:00 AM	EVE	6:00 PM	NITE	10:00 PM
	HEAT	70°F	HEAT	62°F	HEAT	70°F	HEAT	62°F
	COOL	78°F	COOL	85°F	COOL	78°F	COOL	82°F
	FAN	Off	FAN	Off	FAN	Off	FAN	Off

MONDAY thru SUNDAY

MORN	6:00 AM
HEAT	70°F
COOL	78°F
FAN	Off
DAY	8:00 AM
HEAT	62°F
COOL	85°F
FAN	Off
EVE	6:00 PM
HEAT	70°F
COOL	78°F
FAN	Off
NITE	10:00 PM
HEAT	62°F
COOL	82°F
FAN	Off

Personal Program Schedule

Use the following personal program schedule to record your settings:

Troubleshooting

Symptom	Remedy
No display	Check for 24 VAC at thermostat; display is blank when 24 VAC is not present Time and day of week must be reset after extended power loss
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 time	Check time (AM/PM) set on thermostat (see Setting the Time)
Thermostat turns on and off too frequently	Adjust temperature differential (see Configuration Mode Settings 2 & 3)
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	Press FAN (right) button to turn fan off
Fan turns on occasionally	Program Mode: Check programmable fan setting in program schedule
Status indicator on	WSHP status blink code
Room temperature is not correct	Calibrate thermostat (see Configuration Mode Setting 8) If remote sensor is used, check S1 and S2 terminal connections
on display instead of room temperature	Check for a bad connection at S1 and S2 terminals, if used (see Configuration Mode Setting 9)
Heat or Cool not coming on	Verify wiring is correct, gently pull on each wire to verify there is a good connection at terminal block
Alarm light on	Unit in alarm lockout condition
Problem not listed above	Press Reset button once*

* Reset Button Function: Time and day are reset, configuration and program settings are unchanged.

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.

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.

Products manufactured in an ISO certified facility.

www.DaikinApplied.com

Documents / Resources

References

• Daikin Applied | Commercial HVAC | Solutions for Indoor Air Quality

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