Daikin LIAF185 Programmable Electronic Thermostat Operation Guide

Daikin LIAF185 Programmable Electronic Thermostat 

• 7-Day, 5-2-Day or 5-1-1-Day Programmable
• Configurable
• Single-Stage Heat/Cool Systems
• Single-Stage Heat Pump Systems
• Two-Speed Fan Speed Selection
• Large Display With Backlight Selectable Fahrenheit or Celsius
• Compatible with Gas, Oil, or Electric
• SimpleSet™ Field Programming
• Status Indicator Light
• Relay Outputs (minimum voltage drop in thermostat)
• Remote Sensor Compatible
• Ideally Suited for:
  • Residential (New Construction/Replacement)
  • Light Commercial

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: 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
• Terminations: S1, S2, Y, W/O/B, G2, G1, RC, RH, C

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 it on voltages over 30 VAC
• Do not short across terminals of gas valves or 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 Daikin 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
WARNING
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 the 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

WARNING
ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse and 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 the cover, pull gently at the seam at the top.
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 a slit in the thermal intrusion barrier and into the wire opening.
9. Use supplied screws to mount the thermostat base to the wall.
10. Insert stripped, labeled wires in matching wire terminals.
11. Gently tug the wire to be sure of the proper connection. Double-check that each wire is connected to the proper terminal.
12.  Turn on the power to the system at the main service panel.
13.  Configure the thermostat (see Page 12) to match the type of system you have.
14. Replace the cover on the thermostat by snapping it in place.
15. Test thermostat operation as described in “Testing the Thermostat” (Page 19).

WARNING
Be sure the exposed portion of wires does not touch other wires

Wiring Diagrams

Heat Pump

 

Remote or Outdoor Sensor Installation (Optional)

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. Configure the thermostat to operate with the remote sensor (see Configuration Mode setting 10). Remote or Outdoor Sensor Installation (Optional)
   Note: Remote or outdoor sensor reading can be displayed by simultaneously pressing the Down and SYS buttons.

Configuration Mode

The configuration mode is used to set the Daikin thermostat to match your heating/cooling system. The Daikin thermostat functions with a heat pump, air conditioning, gas, oil or electric heat systems. To configure the Daikin thermostat, perform the following steps:

1. Verify the Daikin thermostat 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 Daikin thermostat is in OFF mode
4. Press the up or down button to change the 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 To exit configuration mode, press the CONFIG switch for 1 second.

Configuration Mode Settings

1. The setup screens for Configuration Mode are as follows:
2. 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 the differential value.
3. Press the right button to advance to the next screen.
4.  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.
5. Deadband (1°F – 9°F) (1°C – 5°C) Set the minimum number of degrees between your heat setpoint and your cool setpoint in Autochangeover mode. Press the up or down button to set the deadband value. Press the right button to advance to the next screen. System – Set for heat pump, non-heat pump, reversing valve operation, and a number of compressors in your system. Choose between two heat pump settings or gas/oil or electric.

Choose	System	Reversing Valve Active	Number of Compressors or Compressor Stages	Type of Heat
Heat Pump	HP	O – Cool Active	1
	HP	b – Heat Active	1
Non-Heat Pump	Heat			Gas/Oil
	Heat			Electric

1. Press the up or down button to select. Press the right button to advance to the next screen.
2. Lockout (0-8°, NITE, COOL-HEAT) Select the number of degrees set temperature can be changed during keypad lockout or select to lockout during the NITE period only. COOL-HEAT lockout allows adjustment of the set temperatures to the maximum heat set temperature selected in Step 6 and minimum cool set temperature selected in Step 7. Note: The mode cannot be changed when the thermostat is locked. Press the up or down button to select. Press the right button to advance to the next screen.
3. Maximum Heat Setpoint (45°F to 90°F) (7°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.
4. Minimum Cool Setpoint (45°F to 90°F) (7°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.
5. Room Temperature Offset (+9°F to -9°F) (+5°C to -5°C) Adjust to calibrate the displayed room temperature to match the 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.
6. Maximum Cycles Allowed Per Hour (- -, 2-6)
   – – = as many as needed, 2-6 = maximum cycles/hour
   Press the up or down button to select.
   Press the right button to advance to the next screen.
7. Temperature Sensor (1-4)
   1. Only the onboard sensor determines room temperature.
   2. Only the remote sensor determines room temperature.
   3. The average temperature of the onboard and remote sensors.
   4. Only the onboard sensor will be used until the NITE period, and then only the remote sensor is used.
8. Press the up or down button to select. Press the right button to advance to the next screen.
9. Cooling Fan Delay Off Time (0, 30, 60, 90 seconds) Select the fan purge time for cooling. Press the up or down button to select. Press the right button to advance to the next screen.
   Note: The Daikin control board provides a minimum Fan Off delay of 30 seconds, even if the thermostat is set for a 0-second delay.
10. Status Indicator Light (Led 0 or 1)
    • 0 = Status indicator never on
    • 1 = Status indicator on with the first stage
    • Press the up or down button to select.
    • Press the CONFIG button for 2 seconds to exit the configuration.

Mode of Operation

The Daikin thermostat is a programmable, manual or auto changeover, single-stage heat, and single-stage cool thermostat. It functions with air conditioning, heat pumps, gas, oil or electric heat systems. The thermostat activates the heating appliance when the room temperature is below the set heat temperature (by the differential temperature) and the red indicator light (configurable) on the thermostat will light. The Daikin thermostat will stop outputting and the red light will turn off when the call for heat has been satisfied. With heat pumps, the thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your compressor.

When the room temperature is greater than the set cool temperature (by the differential temperature), the cooling device is activated and the green indicator light (configurable) on the thermostat will turn on. The Daikin thermostat will stop outputting and the green light will turn off when the call for cooling is satisfied. The thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your compressor. The Daikin thermostat 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, and the fan speed can be set in all operating modes using the fan speed switch. In heat mode, the thermostat controls the heating system. In 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 modes. The program schedule can be overridden by changing the set temperature (up or down button). This puts the Daikin thermostat on 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 setup. The Daikin thermostat also has a button lockout feature. This enables the thermostat to be set to the proper mode and temperature and locked so it cannot be tampered with.

Operating Modes

OFF Mode

•  In this mode, the thermostat will not turn on the heating or cooling devices
  Note: The fan speed can be set in all operating modes using the fan speed switch
• Heat Mode
  In this mode, the thermostat controls the heating system. When the heat outputs, the flame icon appears on the display.
  Note: For heat pumps, there is a four-minute delay for your compressor to restart after it has turned off.
• Cool Mode
  In this mode, the thermostat controls the cooling system. When the cooling outputs, the snowflake icon appears on the display.
  Note: There is a four-minute delay for your compressor to restart after it has turned off.
• 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 Thermostat

Once the thermostat is configured, 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. 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. Red LED may turn on.
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.
   Note: For heat pumps, there is a four-minute delay to protect your compressor after it turns off. To bypass the compressor time delay, go to OFF mode for 5 seconds.

Cool Test

1. Press SYS (left) button until cool mode is displayed.
2. Adjust the set temperature so it is 5 degrees below room temperature.
3.  A/C should come on within a few seconds. The green LED may turn 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.
   Note: There is a four-minute time delay to protect the compressor after it turns off. To bypass the compressor time delay, go to OFF mode for 5 seconds.

Fan Test

1. Press FAN (right) button. Fan displays. The indoor fan turns ON.
2.  Press FAN (right) button. The 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. 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. Press the FAN (right) button once to select minutes (minutes flashing).
   Press the up or down button to adjust the minutes.
4. Press the FAN (right) button once to select day of the week (TODAY flashing).
5. Press the up or down button to select the 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 Daikin 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 Daikin thermostat 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.

SUN MON TUE WED THU FRI SAT PROG
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.

• From any of the screens on Page 21, 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 the 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 fans continuously

Note: Programmable fan operates in Program mode only. Repeat the 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.

Lockout Feature      

The Daikin thermostat has a button lockout feature so the mode cannot be changed and the temperature adjustment is limited. Select the appropriate lockout from Configuration Mode Settings (Step 5, Page 13) of this guide.

To activate the LOCK feature:

1. Simultaneously press the SYS, FAN, and UP buttons for 10
2. will display and the lockout function will be

To deactivate the LOCK feature, repeat steps 1 and 2 above

Factory Preprogramming

The Daikin thermostat comes preprogrammed with the following schedule:

 

Personal Program Schedule

Use the following personal program schedule to record your settings:

 

SimpleSetTM Field Programming

This feature is used for transferring configuration and program schedule from the master to the target thermostat. All thermostats for a job can be mounted and powered up. Configure and program one thermostat. This will be the master. The master will be used to copy the program to the rest of the thermostats.
Preparing the master to Send:

1. The master must be powered with 24 VAC.
2. Verify the master thermostat is in OFF mode.
3. Press SYS (left) button until OFF mode displays.
4. Remove the cover of the master thermostat by gently pulling near one of the corners at the top of the thermostat.
5. Press the up and down buttons and CONFIG switch simultaneously for 5 seconds.
6. The OUT screen displays indicating the master thermostat is ready to transfer data.
   Note: Press the up and down buttons and CONFIG switch simultaneously for 5 seconds to exit from data transfer mode and to return the master to the OFF mode.
7. Turn off the power to the master and remove it from the wall.
8. Connect the master to the target using the 3-wire connector. Attach one end to the Master’s FP pins and the other end to Target’s FP pins.
   Note: Target thermostat must be powered with 24 VAC for field programming to occur

When the connection has been made correctly, the master thermostat will power up and the target will count from 5 down to 1. It will then display the LOCK confirming the data has been saved in memory.
When all target thermostats have been completed, reinstall the master thermostat. Press the up and down buttons and the CONFIG switch simultaneously for 5 seconds to exit from the data transfer mode and to return the master thermostat to the OFF mode.

Troubleshooting

Symptom	Remedy
No display	Check for 24 VAC at thermostat; the display is blank when 24 VAC is not present Time and day of the week must be reset after extended power loss
The system fan does not come on properly	Verify wiring is correct, check Gas/Electric Configuration (see Setting 4, Page 12)
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, Page 20)
Thermostat turns on and off too frequently	Adjust temperature differential (see Configuration Mode Setting 2, Page 11)
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 (see Page 22)
Status indicator light not on during call	Turn status indicator function on (see Configuration Mode Setting 12, Page 15)
Room temperature is not correct	Calibrate thermostat (see Configuration Mode Setting 8, Page 14) If remote sensor is used, check S1 and S2 terminal connections
displays when any button is pressed	Thermostat has the button lockout function activated (see Lockout Feature, Page 23 and Configuration Mode Setting 5, Page 13)
on display instead of room temp.	Check for a bad connection at S1 and S2 terminals, if used (see Configuration Mode Setting 10, Page 14)
Heat or Cool not coming on	Verify wiring is correct, verify RC/RH jumper is in place (for single transformer system)
Remote or outdoor sensor not accurate	Press SYS and Down buttons simultaneously to display remote or outdoor temperature. Verify connections at S1 and S2 terminals.
Problem not listed above	Press Reset button once*

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

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 a 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 LIAF185 Programmable Electronic Thermostat Operation Guide

Daikin LIAF185 Programmable Electronic Thermostat Operation Guide