Daikin Room Air Conditioner

Safety Considerations

Read these Safety Considerations for Installation carefully before installing an air conditioner or heat pump. After completing the installation, ensure the unit operates properly during startup. Instruct the user on operation and maintenance. Store this manual with the operation manual for future reference. Always use a licensed installer or contractor. Improper installation can result in water or refrigerant leakage, electric shock, fire, or explosion.

Meanings of DANGER, WARNING, CAUTION, and NOTE Symbols:

• DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
• WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
• CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.
• NOTE: Indicates situations that may result in equipment or property-damage accidents only.

DANGER

• Refrigerant gas is heavier than air and replaces oxygen. A massive leak can lead to oxygen depletion, especially in basements, and an asphyxiation hazard could occur leading to serious injury or death.
• Do not ground units to water pipes, gas pipes, telephone wires, or lightning rods as incomplete grounding can cause a severe shock hazard resulting in severe injury or death. Additionally, grounding to gas pipes could cause a gas leak and potential explosion causing severe injury or death.

WARNING

• If refrigerant gas leaks during installation, ventilate the area immediately. Refrigerant gas may produce toxic gas if it comes into contact with fire. Exposure to this gas could cause severe injury or death.
• After completing installation, check that the refrigerant gas does not leak throughout the system.
• Do not install the unit in an area where flammable materials are present due to risk of explosions that can cause serious injury or death.
• Safely dispose all packing and transportation materials in accordance with federal/state/local laws or ordinances. Packing materials such as nails and other metal or wood parts, including plastic packing materials used for transportation may cause injuries or death by suffocation.
• Only qualified personnel must carry out the installation work. Installation must be done in accordance with this installation manual. Improper installation may result in water leakage, electric shock, or fire.
• When installing the unit in a small room, take measures to keep the refrigerant concentration from exceeding allowable safety limits. Excessive refrigerant leaks, in the event of an accident in a closed ambient space, can lead to oxygen deficiency.
• Use only specified accessories and parts for installation work. Failure to use specified parts may result in water leakage, electric shock, fire, or the unit falling.
• Install the air conditioner or heat pump on a foundation strong enough that it can withstand the weight of the unit. A foundation of insufficient strength may result in the unit falling and causing injuries.
• Take into account strong winds, typhoons, or earthquakes when installing. Improper installation may result in the unit falling and causing accidents.
• Make sure that a separate power supply circuit is provided for this unit and that all electrical work is carried out by qualified personnel according to local, state, and national regulations. An insufficient power supply capacity or improper electrical construction may lead to electric shock or fire.
• Make sure that all wiring is secured, that specified wires are used, and that no external forces act on the terminal connections or wires. Improper connections or installation may result in fire.
• When wiring, position the wires so that the electrical wiring box cover can be securely fastened. Improper positioning of the electrical wiring box cover may result in electric shock, fire, or the terminals overheating.
• Before touching electrical parts, turn off the unit.
• It is recommended to install a ground fault circuit interrupter if one is not already available. This helps prevent electric shock or fire.
• Securely fasten the outdoor unit terminal cover (panel). If the terminal cover/panel is not installed properly, dust or water may enter the outdoor unit causing fire or electric shock.
• When installing or relocating the system, keep the refrigerant circuit free from substances other than the specified refrigerant (R410A) such as air. Any presence of air or other foreign substance in the refrigerant circuit can cause an abnormal pressure rise or rupture, resulting in injury.
• Do not change the setting of the protection devices. If the pressure switch, thermal switch, or other protection device is shorted and operated forcibly, or parts other than those specified by Daikin are used, fire or explosion may occur.

CAUTION

• Do not touch the switch with wet fingers. Touching a switch with wet fingers can cause electric shock.
• Do not allow children to play on or around the unit to prevent injury.
• The heat exchanger fins are sharp enough to cut. To avoid injury wear gloves or cover the fins while working around them.
• Do not touch the refrigerant pipes during and immediately after operation as the refrigerant pipes may be hot or cold, depending on the condition of the refrigerant flowing through the refrigerant piping, compressor, and other refrigerant cycle parts. Your hands may suffer burns or frostbite if you touch the refrigerant pipes. To avoid injury, give the pipes time to return to normal temperature or, if you must touch them, be sure to wear proper gloves.
• Install drain piping to proper drainage. Improper drain piping may result in water leakage and property damage.
• Insulate piping to prevent condensation.
• Be careful when transporting the product.
• Do not turn off the power immediately after stopping operation. Always wait for at least 5 minutes before turning off the power. Otherwise, water leakage may occur.
• Do not use a charging cylinder. Using a charging cylinder may cause the refrigerant to deteriorate.
• Refrigerant R410A in the system must be kept clean, dry, and tight.
• (a) Clean and Dry -- Foreign materials (including mineral oils such as SUNISO oil or moisture) should be prevented from getting into the system.
• (b) Tight -- R410A does not contain any chlorine, does not destroy the ozone layer, and does not reduce the earth's protection against harmful ultraviolet radiation. R410A can contribute to the greenhouse effect if it is released. Therefore, take proper measures to check for the tightness of the refrigerant piping installation. Read the chapter Refrigerant Piping Work and follow the procedures.
• Since R410A is a blend, the required additional refrigerant must be charged in its liquid state. If the refrigerant is charged in a state of gas, its composition can change and the system will not work properly.
• The indoor unit is for R410A. See the catalog for indoor models that can be connected. Normal operation is not possible when connected to other units.
• Remote controller (wireless kit) transmitting distance can be shorter than expected in rooms with electronic fluorescent lamps (inverter or rapid start types). Install the indoor unit far away from fluorescent lamps as much as possible.
• Indoor units are for indoor installation only. Outdoor units can be installed either outdoors or indoors. This unit is for indoor use.
• Do not install the air conditioner or heat pump in the following locations:
  • (a) Where a mineral oil mist or oil spray or vapor is produced, for example, in a kitchen. Plastic parts may deteriorate and fall off or result in water leakage.
  • (b) Where corrosive gas, such as sulfurous acid gas, is produced. Corroding copper pipes or soldered parts may result in refrigerant leakage.
  • (c) Near machinery emitting electromagnetic waves. Electromagnetic waves may disturb the operation of the control system and cause the unit to malfunction.
  • (d) Where flammable gas may leak, where there is carbon fiber, or ignitable dust suspension in the air, or where volatile flammables such as thinner or gasoline are handled. Operating the unit in such conditions can cause a fire.
• Take adequate measures to prevent the outdoor unit from being used as a shelter by small animals. Small animals making contact with electrical parts can cause malfunctions, smoke, or fire. Instruct the user to keep the area around the unit clean.

NOTE

• Install the power supply and inter-unit wires for the indoor and outdoor units at least 3.5ft away from televisions or radios to prevent image interference or noise. Depending on the radio waves, a distance of 3.5ft may not be sufficient to eliminate the noise.
• Dismantling the unit, treatment of the refrigerant, oil and additional parts must be done in accordance with the relevant local, state, and national regulations.
• Do not use the following tools that are used with conventional refrigerants: gauge manifold, charge hose, gas leak detector, reverse flow check valve, refrigerant charge base, vacuum gauge, or refrigerant recovery equipment.
• If the conventional refrigerant and refrigerator oil are mixed in R410A, the refrigerant may deteriorate.
• This air conditioner or heat pump is an appliance that should not be accessible to the general public.
• As design pressure is 478 psi, the wall thickness of field-installed pipes should be selected in accordance with the relevant local, state, and national regulations.

Accessories

*1 Only for FTX(K)09/12/15/18/24* *2 09/12 class: without frame, 15/18/24 class: with frame

Choosing an Installation Site

Before choosing the installation site, obtain user approval.

1. Indoor unit

The indoor unit should be positioned in a place where:

1. The restrictions on the installation requirements specified in “Indoor Unit Installation Diagram” on page 4 are met.
2. Both the air inlet and air outlet are unobstructed.
3. The unit is not exposed to direct sunlight.
4. The unit is away from sources of heat or steam.
5. There is no source of machine oil vapour (this may shorten the indoor unit service life).
6. Cool/warm air is circulated throughout the room.
7. The unit is away from electronic ignition type fluorescent lamps (inverter or rapid start type) as they may affect the remote controller range.
8. The unit is at least 3.3ft (1m) away from any television or radio set (the unit may cause interference with the picture or sound).
9. No laundry equipment is nearby.

2. Wireless remote controller

Turn on all the fluorescent lamps in the room, if any, and find a location where the remote controller signals are properly received by the indoor unit (within 23ft (7m)).

Indoor Unit Installation Diagram

Diagram illustrating the indoor unit installation:

• Mounting Plate (A): Shows the mounting plate and its fixing screws (B). It indicates that the mounting plate should be installed on a wall capable of supporting the unit's weight. Recommended clearances are shown: 1-3/16" (30mm) or more from the ceiling, and 1-15/16" (50mm) or more from walls on both sides.
• Front Panel and Service Lid: Depicts the front panel and the removable service lid. The opening method for the service lid involves removing a screw, pulling it horizontally, and then pulling it down.
• Filters: Shows the air filters and the Titanium apatite photocatalytic air-purifying filter (C), noting it's sold separately for FTXN or FTKN models.
• Pipe Hole and Insulation: Illustrates caulking the pipe hole gap with putty and wrapping thermal insulation pipe with tape, ensuring no gaps.
• Remote Controller Holder: Shows the remote controller holder (E) and its fixing screw (F), advising to ensure control signals are properly received before mounting.
• Unit Attachment: Details how to attach the indoor unit to the mounting plate by hooking the bottom frame to the plate hooks. It suggests removing the front grille if hooks are difficult to engage. It also shows how to remove the indoor unit by pushing up a marked area on the front grille.

Indoor Unit Installation

1. Installing the mounting plate

The mounting plate must be installed on a wall that can support the indoor unit's weight. Temporarily secure the plate, ensure it is level, mark drilling points, and then secure it with screws. Diagrams show recommended retention spots and dimensions for 09/12 class and 15/18/24 class units, including through-the-wall hole locations and drain hose positions.

2. Drilling a wall hole and installing wall embedded pipe

WARNING: For metal frame or metal board walls, use a wall embedded pipe and wall hole cover in the feed-through hole to prevent heat, electric shock, or fire.

• Caulk gaps around pipes with caulking material to prevent condensation.
• Drill a feed-through hole: 2-9/16 inch (65mm) diameter for 09/12 class, 3-1/8 inch (80mm) diameter for 15/18/24 class. Drill at a downward angle towards the outside.
• Insert a wall embedded pipe into the hole.
• Insert a wall hole cover into the wall pipe.
• After completing refrigerant piping, wiring, and drain piping, caulk the pipe hole gap with putty.

3. Installing the indoor unit

When bending or curing refrigerant pipes, avoid pressing them strongly onto the bottom frame or front grille to prevent abnormal sound.

3-1. Right-side, right-back, or right-bottom piping

1. Attach the drain hose to the underside of the refrigerant pipes with adhesive vinyl tape.
2. Wrap the refrigerant pipes and drain hose together with insulation tape.
3. Pass the drain hose and refrigerant pipes through the wall hole. Set the indoor unit on the mounting plate hooks, using the markings at the top of the unit as a guide.
4. Open the front panel and service lid.
5. Pass the inter-unit wire from the outdoor unit through the wall hole, then to the front of the indoor unit from the back. Pull the wires forward. Bend cable tie wires upward for easier work.
6. Press the bottom frame of the indoor unit with both hands to set it on the mounting plate hooks. Ensure wire leads do not catch on the unit's edge.

3-2. Left-side, left-back, or left-bottom piping

How to replace the drain plug and drain hose

• Replacing onto the left side: Remove the drain hose fixing screw on the right and remove the hose. Remove the drain plug on the left and attach it to the right side. Insert the drain hose and tighten with the fixing screw. Forgetting to tighten may cause water leakages.

Diagrams show drain hose attachment positions and how to set the drain plug, emphasizing not to use lubricating oil on the plug.

3. Shape the refrigerant pipes along the pipe path marking on the mounting plate.
4. Pass the drain hose and refrigerant pipes through the wall hole, then position the indoor unit on the mounting plate hooks.
5. Pull in the inter-unit wire.
6. Connect the refrigerant pipes.
7. In case of pulling the drain hose through the back of the indoor unit, wrap the refrigerant pipes and drain hose together with insulation tape.
8. Press the bottom edge of the indoor unit to firmly catch it by the mounting plate hooks. Secure the indoor unit with the indoor unit fixing screws (H).

3-3. Wall embedded piping

Insert the drain hose to a depth so it won't be pulled out of the drain pipe (1-15/16" (50mm) or more).

4. Wiring

WARNING: Do not use tapped wires, extension cords, or starburst connections. Do not use locally purchased electrical parts. Do not connect the power wire to the indoor unit. Do not turn on the circuit breaker until all work is completed.

1. Strip wire ends (3/4 inch (20mm)).
2. Connect inter-unit wires between indoor and outdoor units, matching terminal numbers. Secure wires with screws. Use a flathead screwdriver for tightening.
3. Connect the ground wire to the corresponding terminals.
4. Pull wires lightly to ensure they are securely connected.
5. Close the service lid, shaping wires so the lid fits securely.

Diagrams show terminal blocks for indoor and outdoor units, wire gauge recommendations (AWG16 for <33ft, AWG14 for >=33ft), and conduit mounting methods for 09/12 class and 15/18/24 class units. Precautions for power supply wiring, including using round crimp-style terminals for stranded wires and curling single core wire ends, are highlighted.

5. Drain piping

1. Connect the drain hose, ensuring it is inclined downward. No trap is permitted. Do not put the end of the hose in water.
2. Remove air filters and pour water into the drain pan to check smooth water flow.
3. Use appropriate parts for drain hose extension or embedded piping.
4. When extending the drain hose, use a commercially available extension hose with a 5/8 inch (16mm) inner diameter. Thermally insulate the indoor section of the extension hose.

Refrigerant Piping Work

1. Flaring the pipe end

1. Cut the pipe end with a pipe cutter.
2. Remove burrs with the cut surface facing downward to prevent filings from entering the pipe.
3. Put the flare nut on the pipe.
4. Flare the pipe.
5. Check that the flaring is done correctly.

Diagrams show the cutting, deburring, and flaring process, including recommended tools and checks for a flawless flare.

WARNING:

• Do not apply mineral oil to the flare. Prevent mineral oil from entering the system.
• Never use previously used piping. Only use parts delivered with the unit.
• Never install a dryer to this R410A unit.
• Incomplete flaring may result in refrigerant gas leakage.

2. Refrigerant piping

CAUTION:

• Use the flare nut fixed to the main unit to prevent cracking.
• Apply refrigeration oil only to the inner surface of the flare to prevent gas leakage.
• Use a torque wrench when tightening flare nuts to prevent damage and gas leakage.
• Align flares and tighten nuts by hand first, then fully with a spanner and torque wrench.

Diagrams illustrate applying oil correctly and tightening with a torque wrench. A table provides flare nut tightening torques for different pipe sizes.

2-1. Caution on piping handling

• Protect the open end of the pipe against dust and moisture.
• All pipe bends should be as gentle as possible; use a pipe bender.

2-2. Selection of copper and heat insulation materials

Use commercial copper pipes and fittings. Insulation material: Polyethylene foam. Heat transfer rate: 0.041 to 0.052W/mK. Use insulation designed for HVAC Systems. ACR Copper only. Insulate both gas and liquid piping. A table provides dimensions for piping size, minimum bend radius, piping thickness, thermal insulation size, and thickness.

Installation Tips

1. Removing and installing the front panel

• Removal method: Place fingers in indentations, open the front panel. Push the left side front panel shaft outward, then push up and remove the panel. Repeat for the right side. Pull the panel toward yourself to remove it.
• Installation method: Align the front panel shaft with grill grooves, push in, and close slowly. Push the center of the lower panel surface to engage hooks.

2. Removing and installing the front grille

• Removal method: Remove the front panel to access the air filter. Remove 2 screws from the front grille (3 screws for 15, 18, 24-class models). Lightly pull the front grille toward you and push down on the upper hooks.
• Installation method: Engage upper hooks (3 locations) and install screws. Install the air filter and then mount the front panel.

3. How to set the different addresses

When two indoor units are installed in one room, set remote controllers for different addresses. This involves removing the battery cover, cutting an address jumper, pressing specific buttons (TEMP, OFF, FAN), and then pressing the indoor unit ON/OFF switch while the OPERATION lamp blinks. If setting fails, repeat the process.

Trial Operation and Testing

1. Trial operation and testing

• Trial operation should be performed in either COOL or HEAT mode.
• Measure supply voltage and ensure it's within the specified range.
• In COOL operation, select the lowest programmable temperature; in HEAT operation, select the highest.
• Carry out trial operation following the operation manual to ensure all functions and parts work properly. Restart operation is disabled for 3 minutes after the system is turned off.
• After trial operation, set the temperature to a normal level (78°F to 82°F (26°C to 28°C) in COOL, 68°F to 75°F (20°C to 24°C) in HEAT).
• For operating in COOL mode in winter or HEAT mode in summer, activate trial operation mode as instructed.
• The air conditioner draws minimal standby power. Shut off the circuit breaker if the system is not used for some time. If the circuit breaker trips, the system will restore its operation mode when power is restored.

2. Test items

Outdoor Unit Installation

1. Installing the outdoor unit

Refer to "Precautions for Selecting a Location" and the "Outdoor Unit Installation Diagram". If drain work is necessary, follow the procedures on the next page.

2. Drain work (only for heat pump models, excluding RXL models)

CAUTION: In cold areas, do not use a drain socket, drain caps, or drain hose with the outdoor unit, as drain water may freeze, impairing heating performance.

• If the drain port is covered by a mounting base or floor surface, place additional foot bases of at least 1-1/4 inch (30mm) in height under the outdoor unit's feet.
• Attach drain cap (1) and drain cap (2). Attach drain socket.
• When attaching the drain socket to the bottom frame, connect the drain hose to the drain socket first.

3. Flaring the pipe end

Follow the same procedure as for the indoor unit installation: cut pipe, remove burrs, place flare nut, flare pipe, and check for correct flaring.

4. Refrigerant piping

Follow the same precautions and procedures as for the indoor unit installation, including using the correct flare nut, applying oil to the inner flare surface, using a torque wrench, and aligning flares.

5. Pressure test and evacuating system

WARNING:

• Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle.
• If refrigerant gas leaks occur, ventilate the room.
• R410A and other refrigerants should always be recovered and never released directly into the environment.
• Use a vacuum pump exclusively for R410A.

CAUTION: It is recommended not to open/close stop valves when the outdoor temperature is below –5°F (–21°C) to prevent refrigerant leakage.

• After piping work is complete, perform a pressure test and evacuate the system with a vacuum pump.
• If using additional refrigerant, purge air from pipes and indoor unit using a vacuum pump, then charge refrigerant.
• Use a hexagonal wrench (3/16 inch (4mm)) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench.

Steps for pressure test and evacuation are detailed, including pressurizing pipes, connecting gauge manifold, evacuating to below 500 microns, leak checking with soapy water, opening valves, and tightening caps.

6. Refilling refrigerant

Check the refrigerant type on the machine nameplate. Precautions when adding R410A: Fill from the liquid pipe in liquid form. Adding R410A in gas form may change its composition and prevent normal operation. Check if the cylinder has a siphon attached.

7. Refrigerant piping work

7-1. Cautions on pipe handling

• Protect the open end of the pipe from dust and moisture.
• All pipe bends should be as gentle as possible; use a pipe bender.

7-2. Selection of copper and heat insulation materials

Use commercial copper pipes and fittings. Insulation material: Polyethylene foam. Heat transfer rate: 0.041 to 0.052W/mK. Use HVAC-designed insulation. ACR Copper only. Insulate both gas and liquid piping. A table provides dimensions for piping size, minimum bend radius, piping thickness, thermal insulation size, and thickness.

Wiring

WARNING:

• Do not use tapped wires, extension cords, or starburst connections.
• Do not use locally purchased electrical parts. Do not branch power for the drain pump from the terminal block.
• Be sure to install a ground fault circuit interrupter capable of handling higher harmonics, as the unit uses an inverter.
• Use an all-pole disconnection type circuit breaker with at least 1/8 inch (3mm) between contact points.
• When wiring, take care not to pull at the conduit.
• Do not connect the power wire to the indoor unit.
• Do not turn on the circuit breaker until all work is completed.

Steps include stripping wire insulation, connecting inter-unit wires to terminal blocks, securing wires with screws, connecting the ground wire, pulling wires lightly, and closing the service lid. Diagrams illustrate wiring connections, conduit mounting for different classes, and precautions for power supply wiring.

Facility Setting* (cooling at low outdoor temperature)

This function is limited to facilities for equipment (e.g., computers), not residences or offices. Only for RX, RK, and RXL models. Cutting jumper J6 expands the operation range down to 5°F (–15°C), but it stops if the outdoor temperature drops below –4°F (–20°C) and restarts when it rises. Procedure involves removing top and front plates and cutting jumper J6. CAUTION: Provide a windbreak wall if the heat exchanger is exposed to direct wind. Intermittent noises may occur. Do not place humidifiers in rooms where facility settings are used. Cutting J6 sets the indoor fan tap to the highest position.

Pump Down Operation

To protect the environment, pump down when relocating or disposing of the unit. Remove valve caps from liquid and gas stop valves. Carry out forced cooling operation. After 5-10 minutes, close the liquid stop valve. After 2-3 minutes, close the gas stop valve and stop forced cooling. Procedures are detailed for using the indoor unit ON/OFF switch or the remote controller.

Trial Operation and Testing

1. Trial operation and testing

• Trial operation should be carried out in either COOL or HEAT operation.
• Measure supply voltage and ensure it is within the specified range.
• In COOL operation, select the lowest programmable temperature; in HEAT operation, select the highest.
• Carry out trial operation following the operation manual to ensure all functions and parts are working properly. Restart operation is disabled for 3 minutes after the system has been turned off.
• After trial operation, set the temperature to a normal level (78°F to 82°F (26°C to 28°C) in COOL, 68°F to 75°F (20°C to 24°C) in HEAT).
• When operating in COOL in winter or HEAT in summer, activate trial operation mode as instructed.
• The air conditioner draws minimal standby power. Shut off the circuit breaker if the system is not to be used for some time. If the circuit breaker trips, the system will restore its operation mode when power is restored.

2. Test items