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
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
Important Safety Information
WARNING!
:
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
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 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.
IMPORTANT:
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.
CAUTION!
:
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”.
Parts Diagram
Icon Descriptions
Cooling operation icon
Fan operation icon
Heating operation icon
Room temperature
offset activated
1
ST
Cool
2
ND
Cool
1
ST
Heat
2
ND
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.
910121748 Output Chart
Configuration Mode
OFF
PM
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.
To exit configuration mode, press the
CONFIG
switch for 1 second.
Press the
up
or
down
button to change settings within each screen.
Down button
Up button
Press the
right
button to advance to the next screen.
Note:
Pressing the
left
button will return you to the previous screen.
Left
button
Right
button
The configuration mode is used to set the
910121748
to match your heating/cooling system. To configure the
910121748
, perform the following steps:
CONFIG
S1 S2 R
C
W
O/B
G
Y1 W2
W3
Y2
RESET
CONFIG
FP
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.
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.
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.
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.
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.
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.
Wiring Diagrams
Configuration
switch
Reset switch
Right (fan) button
Down button
Up button
S1 S2 R
C
G
Y1 W2 Y2
RESET
CONFIG
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.
PROG
FAN
(right)
Down
button
Up
button
SYS
tem
(left)
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 Installation (Optional)
Note:
Remote or outdoor sensor reading can be
displayed by simultaneously pressing the
Down
and
SYS
buttons.
Remote Sensor:
(Contact Daikin for optional remote sensor.)
Terminal Designator Descriptions
R – 24 VAC hot
C – 24 VAC common
W1 – 1st stage heat
Y1 – 1st stage cool
W2 – 2nd stage heat
Y2 – 2nd stage cool
G – Fan
A – Alarm input
L – Status input
O – Override/reset
L
S1
S2
R
C
W1
Y1
W2
Y2
G
A
O
O
G
Y1
Y2
W1
W2
A
R
C
4
3
2
1
5
O
G
Y1
Y2
W1
W2
A
R
C
ICM
Thermostat
Terminal
TB2
TB1
ICM
Thermostat
Terminal
WSHP Main Control Board
Terminals TB1 and TB2
Daikin P/N (910121748)
Installation, Operation & Application Guide
• 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
Version B: 10-15-13
2 Heat/2 Cool, 7-Day Programmable, Auto Changeover, Hardwired
Programmable Electronic Thermostat
