Daikin D4273 Programmable Thermostat Quick Start Guide

Daikin D4273 Programmable Thermostat

Compatibility

The Daikin thermostat is designed to work with 24Vac systems requiring both the R & C wires. This includes gas, electric, oil, forced air, variable speed, heat pump and radiant heat. It can control:

• Up to 4 stages of heating, depending on model
• Up to 2 stages of cooling, depending on model
• Heat pump: with auxiliary and emergency heat
• Fan
• Dual fuel systems (heat pump with furnace, D4273 only)
• Whole-home humidifiers and dehumidifiers (models D4273 and D4272C only)

Contents

Necessary Tools

If DAC-VWF is installed

INSTALLATION

Step 1 – Power Off the Current System\

1. Go to your home’s circuit breaker panel and switch the furnace and air conditioner breakers off.
2. To confirm power is off, adjust the temperature on your current thermostat.
   If the system does not respond accordingly, power has probably been successfully shut off.
   WARNING: Failure to follow this step can result in personal injury and/or death from shock and electrocution.

Step 2 – Remove Faceplate

Remove the faceplate of the current system. Most faceplates snap off or feature small screws that will need to be removed.
WARNING: If you see large thick electrical wires, or wire nuts, or if your system is labeled 120V or 240V DO NOT PROCEED. THIS THERMOSTAT IS NOT COMPATIBLE WITH THESE SYSTEMS
WARNING: Failure to follow this step can result in personal injury and/or death from shock and electrocution.

Step 3 – Before you go any further

Determine what your existing wiring and equipment situation is before you disconnect any wires. If you are unsure of what type of system you have, you may need to seek professional support.

1. If you have a Heating only system without Air Conditioning, the Daikin thermostat will require 3 wires. These 3 wires are: R (24Vac), C (24Vac) and W (Heat). Most Heating only systems use very simple thermostats that only require 2 wires the R (24Vac) and W (Heat). The thermostat requires 3 wires to the thermostat. In this case an Add-A-Wire accessory will not work and it will be necessary to install another wire for the C (24Vac) connection.
2. If you have a single-stage fossil fuel heater with air conditioning, the Daikin thermostat will require 5 wires for independent fan control. They are R (24Vac), C (24Vac), W (Heat), Y (Cooling), and G (Fan). You may connect only 4 wires, as instructed below, to the thermostat but will give up independent fan control. The fan will still operate with a Heating or Cooling demand.
   If there are only 4 wires present that are connected to the existing thermostat, there are at least 3 options available to connect the Daikin thermostat, they are:
   • Use the 4 wires as instructed below and note that the fan will only operate with a Heating or Cooling demand.
   • Pull new thermostat wire from the HVAC equipment to the thermostat so that there are at least 5 wires available.
   • Purchase and install a Daikin Add-A-Wire accessory (TSTATG AC0410).
3. If you have a multi-stage HVAC system comprised of a fossil fuel heater with air conditioning the Daikin thermostat will require the 5 wires mentioned above (R, C, W, Y, and G) plus an additional wire for each additional stage of Heating or Cooling. You may reduce the 5-wire requirement to 4 if you give up independent fan control, or use the optional accessory; Add-A-Wire.
4. If you have a heat pump without aux heat the Daikin thermostat will require 5 wires: R (24Vac), C (24Vac), W1/O/B (reversing valve),Y (1st stage compressor), and G (fan). If there are only 4 wires present that are connected to the existing thermostat, there are at least 3 options available to connect the Daikin thermostat, they are:
   • Use the 4 wires as instructed below and note that the fan will only operate with a Heating or Cooling demand.
   • Pull new thermostat wire from the HVAC equipment to the thermostat so that there are at least 5 wires available.
   • Purchase and install a Daikin Add-A-Wire accessory (TSTATGAC0410).
5. If you have a heat pump with aux heat the Daikin thermostat will require 6 wires: R (24Vac), C (24Vac), W1/O/B (reversing valve), Y (1st stage compressor), W2 (Aux Heat) and G (fan). If there are only 5 wires present that are connected to the existing thermostat, there are at least 3 options available to connect the Daikin thermostat, they are:
   • Use the 5 wires as instructed below and note that the fan will only operate with a Heating or Cooling demand.
   • Pull new thermostat wire from the HVAC equipment to the thermostat so that there are at least 6 wires available.
   • Purchase and install a Daikin Add-A-Wire accessory (TSTATGAC0410).

MAKING 4 WIRES WORK when 5 are required (without the optional Add-A-Wire accessory)

• If you have an all-electric heat system with air conditioning, this method is not an option. You must either pull a new wire or use the optional Add-A-Wire accessory (TSTATGAC0410).
• If you have a single-stage fossil fuel heater with air conditioning, and you would like to install the Daikin thermostat using only 4 wires, follow the directions below. You will need a screwdriver along with a 3” or 4” long piece of thermostat wire to use as a jumper.

1. Make sure the power is off as step 1 on page 4 instructs you.
2. Follow step 4 on page 9 “Label and Disconnect Wires” at the thermostat. Please note the color and the corresponding wire designator with each color. An example is the R wire is red and the W wire is white and so on. You will need this for the next step at the HVAC equipment.
3. At the equipment end of the thermostat wires, locate the terminals that the wires are attached to.
   • Remove the “G wire” from the terminal marked G.
   • Place the “G wire” on terminal C.
   • Place one end of the jumper on terminal G.
   • Place the other end of the jumper on terminal Y. Please note that there will be more than 1 wire on terminal Y.
4. Connect the wires to the terminals on the DAIKIN backplate taking care to make sure that each wire from the HVAC equipment is connected to the same terminal designation on the DAIKIN backplate. For example, the “C wire” from the HVAC equipment should be connected to the “C” terminal of the thermostat. The “R” wire on the equipment terminal should be connected to the “R” terminal on the DAIKIN backplate, and so on.

MAKING 5 WIRES WORK when 6 are required (without the optional Add-A-Wire accessory)

• If you have an all-electric heat system with air conditioning, this method is not an option. You must either pull new wire or use the optional Add-A-Wire accessory (TSTATGAC0410).
• If you have a multi stage system that requires 6 wires, and you would like install the Daikin thermostat using only 5 wires, follow the directions below. You will need a screwdriver along with a 3” or 4” long piece of thermostat wire to use as a jumper.

1. Make sure the power is off as step 1 on page 6 instructs you.
2. Follow step 4 on page 9 “Label and Disconnect Wires” at the
   thermostat. Please note the color and the corresponding wire
   designator with each color. An example is the R wire is red and the
   W wire is white and so on. You will need this for the next step at
   the HVAC equipment.
3. At the equipment end of the thermostat wires, locate the
   terminals that the wires are attached to.
   A. Remove the “G wire” from the terminal marked G.
   B. Place the “G wire” on terminal C.
   C. Place one end of the jumper on terminal G.
   D. Place the other end of the jumper on terminal Y.
   Please note that there will be more than 1 wire on terminal Y.
   E. Connect the wires to the terminals on the Thermostat
   backplate taking care to make sure that each wire from the
   HVAC equipment is connected to the same terminal on the
   thermostat backplate. For example: the “C wire” from the HVAC
   equipment is connected to the “C” terminal of the thermostat
   and so on.

 

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