Daikin 668811101 Non-Programmable Electronic Thermostat

Product Overview

This guide covers the Daikin 668811101 Non-Programmable Electronic Thermostat, suitable for 1 Heat/1 Cool, Auto Changeover, and Fan Speed Control systems. It is designed for hardwired installations and is configurable for various HVAC systems including single-stage heat/cool, single-stage heat pump, gas, oil, or electric heat. Key features include a large backlit display, selectable Fahrenheit or Celsius, SimpleSet™ Field Programming, status indicator light, relay outputs, and remote sensor compatibility. It is ideally suited for residential and light commercial applications.

Important Safety Information

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

• This thermostat is for 24 VAC applications only; do not use on voltages over 30 VAC.
• Do not short across terminals of gas valve or system control to test operation, as this will damage the thermostat and void the warranty.
• All wiring must conform to local and national electrical and building codes.
• Do not use air conditioning when the outdoor temperature is below 50°F (10°C), as this can damage the A/C system and cause personal injuries.
• Use this thermostat only as described in this manual.

Parts Diagram

The thermostat features the following components:

• Buttons: Up button, Down button, Left (System) button, Right (Fan) button.
• Switches/Pins: Configuration switch, Reset switch, Field programming pins, Fan switch.
• Jumper: RC/RH Jumper (for 2 transformer systems).
• Terminals: S1, S2, Y, W/O/B, G2, G1, RC, RH, C.

Icon Descriptions:

• Fan operation icon: [Fan symbol]
• Cooling operation icon: [Snowflake symbol]
• Heating operation icon: [Flame symbol]

Specifications

• Electrical Rating: 24 VAC (18-30 VAC), 1 amp maximum per terminal, 3 amp maximum total load.
• Temperature Control Range: 45°F to 90°F (7°C to 32°C).
• Accuracy: ±1°F (±0.5°C).
• System Configurations: 1-stage heat, 1-stage cool, heat pump, gas, oil, electric.
• Timing: Anti-short Cycle: 4 minutes.
• Backlight Operation: Yes.
• Terminations: S1, S2, Y, W/O/B, G2, G1, RC, RH, C.

Package Contents/Tools Required

Package Includes: Daikin 668811101 programmable thermostat and Operation and Application Guide.

Tools Required (Not Included): Screwdriver, wire strippers, drill with 3/16” bit, hammer, wire labels, pencil.

Wiring Diagrams

The thermostat supports hardwired connections. Diagrams illustrate:

• 5-Wire, Single Transformer configuration.
• 5 or 6-Wire, Single Transformer configuration.

WARNING: Ensure exposed wire portions do not touch other wires.

To Remove Existing Thermostat

WARNING: Turn off power at the main service panel before proceeding.

1. Turn off power to the heating and cooling system.
2. Remove the cover of the old thermostat to expose wires.
3. Label existing wires before disconnecting them.
4. Remove wires from terminals.
5. Remove the existing thermostat base from the wall.
6. Refer to installation instructions for the new thermostat.

To Install Thermostat

WARNING: Turn off power at the main service panel before proceeding.

IMPORTANT: Installation must conform to local and national building and electrical codes.

Mounting Note: Mount the thermostat approximately five feet above the floor. Avoid mounting on an outside wall, in direct sunlight, behind a door, or near vents/ducts.

1. Turn off power to the heating and cooling system.
2. Gently pull the thermostat cover at the top seam to remove it.
3. Position the thermostat base against the wall, ensuring wires feed through the opening.
4. Mark the mounting hole locations.
5. Set the base and cover aside.
6. Drill holes at marked locations using a 3/16” drill bit.
7. Tap supplied anchors into the mounting holes with a hammer.
8. Align the thermostat base with the mounting holes, feeding control wires through the barrier and opening.
9. Mount the base to the wall using supplied screws.
10. For 2-transformer systems, remove and discard the RC/RH jumper.
11. Insert stripped, labeled wires into matching terminals.
12. Gently tug wires to ensure secure connections and double-check terminal assignments.
13. Turn on power to the system at the main service panel.
14. Configure the thermostat according to your system type.
15. Replace the cover by snapping it into place.
16. Test thermostat operation as described in the "Testing the Thermostat" section.

Remote or Outdoor Sensor Installation (Optional)

Required: Daikin Remote Sensor Part No. 667720401.

1. Remove the cover from the remote sensor housing.
2. Select an appropriate mounting location for the remote sensor.
3. Mount the remote sensor unit using provided hardware.
4. Install two-strand shielded wire between the remote sensor and thermostat. Shielded wire is mandatory. Do not run sensor wire in conduit with other wires.
• Wire 1: Connect between S1 terminal on thermostat and S1 terminal on remote sensor.
• Wire 2: Connect between S2 terminal on thermostat and S2 terminal on remote sensor.
• Connect the wire shielding to the S2 terminal on the thermostat.
5. Configure the thermostat to use the remote sensor (see Configuration Mode setting 10).

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

Configuration Mode

This mode allows setting the Daikin thermostat to match your heating/cooling system (heat pump, A/C, gas, oil, electric). To configure:

1. Ensure the thermostat is in OFF mode (press SYS button until OFF displays).
2. Remove the thermostat cover by gently pulling at the top seam.
3. Press and hold the CONFIG button for 1 second while in OFF mode.
4. Use the Up/Down buttons to change settings and the Right button to advance to the next screen. The Left button returns to the previous screen. Exit by pressing CONFIG for 1 second.

Configuration Settings:

1. Temperature Scale: Select Fahrenheit (F) or Celsius (C).
2. Temperature Differential: Set the degree difference between setpoint and turn-on temperature (1°F to 5°F or 0.5°C to 2.5°C).
3. Deadband: Set the minimum degree difference between heat and cool setpoints in Autochangeover mode (1°F to 9°F or 1°C to 5°C).
4. System: Configure for heat pump, non-heat pump, reversing valve operation, and number of compressors/stages. Options include Heat Pump (HP O 1, HP b 1), Non-Heat Pump (Heat Gas, Heat Electric).
5. Lockout: Set the allowable temperature change during keypad lockout (0-8°). COOL-HEAT lockout limits adjustments to maximum heat and minimum cool setpoints.
6. Maximum Heat Setpoint: Adjust the highest allowed heat set temperature (45°F to 90°F or 7°C to 32°C).
7. Minimum Cool Setpoint: Adjust the lowest allowed cool set temperature (45°F to 90°F or 7°C to 32°C).
8. Room Temperature Offset: Calibrate the displayed room temperature to match actual temperature (+9°F to -9°F or +4.5°C to -4.5°C). A CAL indicator appears when offset is not 0.
9. Maximum Cycles Allowed Per Hour: Set the maximum heating/cooling cycles per hour (-- for as many as needed, 2-6).
10. Temperature Sensor: Select sensor for room temperature: 1 (on-board only), 2 (remote only), or 3 (average of on-board and remote).
11. Cooling Fan Delay Off Time: Select fan purge time for cooling (0, 30, 60, 90 seconds).
12. Status Indicator Light: Configure the LED indicator: 0 (never on) or 1 (on with first stage).

Press CONFIG for 2 seconds to exit configuration.

Mode of Operation

The Daikin thermostat is an auto-changeover, single-stage heat/cool thermostat compatible with various systems. It activates heating when room temperature is below the set heat temperature (plus differential) and cooling when above the set cool temperature (minus differential). Heat pumps and A/C compressors have a 4-minute restart delay to protect the equipment. The thermostat offers four operating modes:

• OFF Mode: No heating or cooling devices are activated. The fan can be manually operated.
• Heat Mode: Controls the heating system. A [Flame symbol] appears on the display.
• Cool Mode: Controls the cooling system. A [Snowflake symbol] appears on the display.
• Cool and Heat Mode (Auto Changeover): Automatically switches between heating and cooling as needed. The display alternates between clock and set temperature.

A button lockout feature is available to prevent unauthorized changes.

Testing the Thermostat

CAUTION: Do not energize the A/C system when the outdoor temperature is below 50°F (10°C) to prevent equipment damage or injury.

Heat Test:

1. Set SYS to Heat mode.
2. Adjust set temperature 5°F above room temperature. Heat should activate (red LED may light).
3. Adjust set temperature 2°F below room temperature. Heat should turn off (fan delay may occur).
4. For heat pumps, a 4-minute compressor delay applies. Bypass by going to OFF mode for 5 seconds.

Cool Test:

1. Set SYS to Cool mode.
2. Adjust set temperature 5°F below room temperature. A/C should activate (green LED may light).
3. Adjust set temperature 2°F above room temperature. A/C should turn off (fan delay may occur).
4. For compressors, a 4-minute delay applies. Bypass by going to OFF mode for 5 seconds.

Fan Test:

1. Press FAN button; fan operates (FAN display and icon appear).
2. Press FAN button again; fan turns off.

Troubleshooting

SimpleSet™ Field Programming

This feature requires the SimpleSet™ Transfer Cable (668817901) and is used for copying configuration from a master thermostat to target thermostats.

Preparing the Master to Send:

1. Ensure the master thermostat is powered with 24 VAC and is in OFF mode.
2. Remove the master thermostat cover.
3. Simultaneously press the Up, Down, and CONFIG buttons for 5 seconds. The "OUT" screen will display, indicating readiness for data transfer.
4. To exit data transfer mode, press Up, Down, and CONFIG simultaneously for 5 seconds.
5. Turn off power to the master and remove it from the wall.
6. Connect the master to the target thermostat using the 3-wire connector, attaching to the Master's FP pins and the Target's FP pins.
7. The target thermostat must be powered with 24 VAC for programming.
8. Upon correct connection, the master will power up, the target will count down from 5 to 1, and then display "LOCK" to confirm data saving.
9. After completing all target thermostats, reinstall the master.

Daikin Training and Development

For training information on Daikin HVAC products, visit www.DaikinApplied.com and click on Training, or call 540-248-9646 and ask for the Training Department.

Warranty

Daikin equipment is sold under standard terms and conditions, including Limited Product Warranty. Consult your local Daikin Representative for warranty details. Refer to Form 933-430285Y. Find your local representative at 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.

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