Daikin 668375401 Non-Programmable Electronic Thermostat Installation Guide

Daikin 668375401 Non-Programmable Electronic Thermostat

• Configurable
• Two-Stage Heat / 2-Stage Cool Systems
• Backlit Display
• Field Temperature Calibration
• Status Indicator Light
• Relay Outputs (minimum voltage drop in thermostat)
• Night Set-Back Override
• Reset

Installation, Operation & Application Guide

Parts Diagram

Specifications

• Electrical rating: 24 VAC/VDC (18-30 VAC/VDC)
• 1 amp maximum per terminal
• 4 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: 2-stage heat, 2-stage cool
• Timing: Backlight Operation: 13 seconds after mode change or button press
• Terminations: -C, +R, W1, Y1, W2, Y2, G, O, S1, S2

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/VDC applications only; do not use it on voltages over 30 VAC/VDC
• Do not short across terminals of system control to test operation; this will damage your thermostat and void your warranty
• All wiring must conform to local and national electrical and building codes
• Use this thermostat only as described in this manual

Package Contents/Tools Required

• Package includes 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 the old thermostat. This should expose the wires.
3. Label the existing wires with the enclosed wire labels before removing the wires.
4. After labeling wires, remove wires from wire terminals.
5. Remove the existing thermostat base from the 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 buildings 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 the cover, insert and twist a coin or screwdriver in the slots on the sides of the thermostat.
3. Put the 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 the thermostat base and cover away from the 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 the thermostat base with mounting holes and feed the control wires through the wire opening.
9. Use supplied screws to mount the thermostat base to the wall.
10. Insert stripped, labeled wires in matching wire terminals. See the “Wiring Diagrams” section of this manual.
    CAUTION!: Be sure the exposed portion of wires does not touch other wires.
11. Tighten the screws on the terminal block. Gently tug the wire to be sure of the proper connection. Double-check that each wire is connected to the proper terminal.
12. Seal holes for wires behind the thermostat with non-flammable insulation or putty.
13. Replace the cover on the thermostat by snapping it in place.
14. Turn on the power to the system at the main service panel.
15. Test thermostat operation as described in “Testing the Thermostat”.

Remote Sensor Installation (Optional)
Requires Daikin Remote Sensor Part Number 667720401

1. Remove the cover from the 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 the remote sensor and thermostat. The shielded wire must be used. Do not run the 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. Disable the main sensor (R12) on the thermostat by cutting it from the circuit board.

Terminal Designator Descriptions

• -C – 24 VAC/VDC common
• +R – 24 VAC/VDC hot
• W1 – 1st stage heat
• Y1 – 1st stage cool
• W2 – 2nd stage heat
• Y2 – 2nd stage cooling
• G – Fan
• O – Override

Wiring Diagram

Non-Programmable, Auto or Manual Changeover (P/N 668375401) Two Stage Heat/Two Stage Cool, Night Setback and Override Feature

 

Note: An additional conductor is required between “O” terminals for the override feature to work.

Configuration Mode

The configuration mode is used to set the Daikin Auto-changeover Electronic Thermostat to match your heating/cooling system. To configure the Daikin Auto-changeover Electronic Thermostat, perform
the following steps:

1. Remove the cover of the thermostat by gently pulling on one of the corners.
2. Simultaneously hold the SW5 and SW6 buttons in for 5 seconds while the Daikin Auto-changeover
   Electronic Thermostat is in OFF mode.
3. Press the or button to change settings within each screen.
4. Press the SW6 button to advance to the next screen.
   Note: The SW5 button will return you to the previous screen.
5. To exit configuration mode, slide the Mode switch to Heat or Cool.

Configuration Mode Settings
The setup screens for Configuration Mode are as follows:

1. Heat Pump and Non-Heat Pump – Press the button to configure it as a heat pump or non-heat pump system. Set to “O” for all Daikin WSHP, PTAC, PTHP, and UV units. Press the SW6 button to advance to the next screen
2. Set to “g”.
   Press the or button to set it to “g”.
   Press the button to advance to the next screen.
3. Temperature Scale (F or C) – Choose Fahrenheit or Celsius.
   Press the or button to select.
   Press the SW6 button to advance to the next screen.
4. 1st Stage Temperature Differential (1°F to 3°F) (0.5°C to 1.5°C)
   Set the number of degrees between your “setpoint” temperature and your “turn on” temperature.
   Press the or button to set the differential value.
   Press the SW6 button to advance to the next screen.
5. 2nd Stage Temperature Differential (1°F to 6°F) (0.5°C to 3.0°C)
   Set the number of degrees between when stage 1 turns on and when stage 2 turns on.
   Press the or button to set the differential value.
   Press the SW6 button to advance to the next screen.
6. Minimum Deadband (2°F to 9°F) (1.0°C to 4.5°C)
   Set the minimum separation between the heat setpoint and cool setpoint in Auto Changeover Mode.
   Press the or button to set the deadband.
   Press the SW6 button to advance to the next screen
7. 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 or button to set the deadband.
   Press the button to advance to the next screen
8. Minimum Cool Setpoint (45°F to 75°F) (7°C to 24.0°C)
   Adjust to control the minimum Cool set temperature allowed.
   Press the or button to select.
   Press the SW6 button to advance to the next screen.
9. Maximum Heat Setpoint (55°F to 90°F) (13°C to 32°C)
   Adjust to control the maximum Heat set temperature allowed.
   Press the or button to select.
   Press the SW6 button to advance to the next screen.
10. Room temperature offset (+9°F to -9°F) (+4.5°C to -4.5°C)
    Adjust to calibrate the displayed room temperature to match the actual room temperature.
    Note: When not set to 0, ROOM will display
    Press the or button to select.
    Press the SW6 button to advance to the next screen.
11. Maximum compressor cycles allowed per hour (-, 2-6)
    – = as many as needed, and 2-6 = maximum cycles/hour
    Press the or button to select.
    Press the SW6 button to advance to the next screen
12. Status Indicator Light (Lt 0, 1, 2)
    0 = Status indicator never on
    1 = Status indicator on with the first stage
    2 = Status indicator on with the second stage
    Press the or button to select.
    Note: Red light indicates the heating cycle and the green light indicates the cooling cycle.
    Slide the Mode switch to Heat or Cool to exit configuration.

Operating Modes

These are the possible operating modes of the Daikin Auto-changeover Electronic Thermostat. Off Mode
In off mode, the thermostat will not turn on the heating or cooling appliances.
Note 1: The indoor fan can be activated in every mode by sliding the Auto/On fan switch to the On position.
Note 2: Off mode is used to enter the configuration setup (by pressing SW5 and SW6 simultaneously for 5 seconds).

Cool Mode
In cool mode, the thermostat controls the cooling system.

Heat Mode
In heat mode, the thermostat controls the heating system.

Auto-changeover Mode
In this mode, the thermostat will automatically change from heat mode to cool mode or vice versa. Pressing the or button in Auto mode causes the thermostat to display the heat set temperature then the cool set temperature. The set temperature that is displayed can be changed using the or buttons.

Override
Press buttons simultaneously for 2 seconds to override night setback. When override is activated, “ ” will be displayed.

Reset
Press and buttons simultaneously for 10 seconds to reset the control board. “ ” will be displayed.

Daikin Auto-changeover Electronic Thermostat

Factory Default Settings

Note: Following are the factory default settings for the Daikin 2811 thermostat:
1.	Heat pump	0
2.	HS gE	g
3.	FC	F
4.	Differential 01	1
5.	Differential 02	2
6.	db	4
7.	Staged outputs	1
8.	LO	45
9.	UP	90
10.	Calibration	0
11.	Maximum compressor cycles per hour	–
12.	Lt	1

Testing the Thermostat

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

Cool Test

1. Slide Mode switch to Cool mode.
2. Adjust the set temperature so it is 5 degrees below room temperature.
3. Air conditioning should come on within a few seconds. The status indicator may come on.
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.

Cool Off Heat Auto

Testing the Thermostat Once the thermostat is installed, it should be thoroughly tested.
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.

Heat Test

1. Slide Mode switch to Heat mode.
2. Adjust the set temperature so it is 5 degrees above the room temperature.
3. Heat should come on within a few seconds. Status indicators may come on.
4. Adjust the set temperature so it is 2 degrees below the room temperature and the heat should turn off. There may be a fan delay on your system.

Troubleshooting

Symptom	Remedy
No display	Check for 24 VAC/VDC at thermostat; display is blank when 24 VAC/VDC is not present
System fan does not come on properly	Verify wiring is correct Check configuration (see “Configuration Mode,” Setting 2) See “Fan Test”
Thermostat turns on and off too frequently	Adjust temperature differential (see “Temperature Differential,” “Configuration Mode,” Settings 4 and 5)
Fan runs continuously	Check fan On/Auto switch, ON position runs indoor fan continuously
Room temperature is not correct	Verify wall hole is plugged with putty or insulation; calibrate thermostat (see “Configuration Mode,” Setting 10)
ROOM displays	Room temperature offset is not zero (see “Configuration Mode,” Setting 10)
Status indicator	Green light – Cooling operation Red light – Heating operating Status indicator option ON (see “Configuration Mode,” Setting 12)
Er displays	Sensor error – check S1 & S2 connections, check remote sensor wire and connections, use shielded wire for remote sensor
Problem not listed above	Press the Reset button once; display will be refreshed and anti-short cycle timing will be reset to zero

Mode of Operation

The Daikin Auto-changeover Electronic Thermostat is a two-stage heat, two-stage cool thermostat. The thermostat activates the first stage of heating when the room temperature is below the heat set temperature (by the differential temperature). The second stage of heating will be activated if the room temperature continues to drop. The heat outputs are staged off (configurable, setting 7) as the room temperature increases.
When the room temperature is greater than the cool set temperature (by the differential temperature), the cooling device is activated. The second stage of cooling will be activated if the room temperature continues to rise. The cool outputs are staged off (configurable, setting 7) as the room temperature drops.

The thermostat has the following operating modes: OFF, Heat, Cool, and Auto. In OFF mode, the thermostat will not turn on heating or cooling devices. In the Heat mode, the thermostat controls the heating system. In the Cool mode, the thermostat controls the cooling system. In the Auto mode, the thermostat operates as an auto-changeover thermostat. It will turn on the heating or cooling as required. The indoor fan can be turned on in all operating modes using the Fan switch. Pressing the buttons simultaneously for 2 seconds causes the thermostat to output from the “O” terminal for 5 seconds. “ ” will show on the display. This will result in the unit going into a night setback override. Pressing the buttons simultaneously for 10 seconds causes the thermostat to output from the “O” terminal for 15 seconds. “ ” will show on the display. This will result in the unit being reset

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

REFERENCE

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Daikin 668375401 Non-Programmable Electronic Thermostat Installation Guide

Daikin 668375401 Non-Programmable Electronic Thermostat Installation Guide