Daikin Room Air Conditioner Installation Manual

Models

The following models are covered by this manual:

FTX/FTK Series:

• FTX09NMVJU, FTK09NMVJU
• FTX12NMVJU, FTK12NMVJU
• FTX18NMVJU, FTK18NMVJU
• FTX24NMVJU, FTK24NMVJU
• FTXN09NMVJU, FTKN09NMVJU
• FTXN12NMVJU, FTKN12NMVJU
• FTXN18NMVJU, FTKN18NMVJU
• FTXN24NMVJU, FTKN24NMVJU

RX/RK Series:

• RX09NMVJU, RK09NMVJU
• RX12NMVJU, RK12NMVJU
• RX18NMVJU, RK18NMVJU
• RX24NMVJU, RK24NMVJU
• RXN09NMVJU, RKN09NMVJU
• RXN12NMVJU, RKN12NMVJU
• RXN18NMVJU, RKN18NMVJU
• RXN24NMVJU, RKN24NMVJU

Contents

• Safety Considerations
• Accessories
• Choosing an Installation Site
• Indoor Unit Installation Drawings
• Indoor Unit Installation
• Refrigerant Piping Work
• Installation Tips
• Trial Operation and Testing
• Wiring
• Facility Setting
• Pump Down Operation

Safety Considerations

Read these Safety Considerations carefully to ensure correct installation. This manual classifies precautions into DANGER, WARNING, and CAUTION. Follow all precautions below as they are important for safety.

⚠️ DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

❗ WARNING: Failure to follow any of WARNING is likely to result in grave consequences such as death or serious injury.

? CAUTION: Failure to follow any of CAUTION may in some cases result in grave consequences.

After completing installation, test the unit to check for installation errors. Provide the user with adequate instructions for use and cleaning according to the Operation Manual.

DANGER Details:

• Refrigerant gas is heavier than air and replaces oxygen. A massive leak could lead to oxygen depletion, especially in basements, causing asphyxiation and serious injury or death. If a leak occurs during installation, ventilate the area immediately. Refrigerant gas can produce toxic gas if it contacts fire (e.g., from a fan heater, stove, or cooking device), leading to severe injury or death.
• After installation, check for refrigerant gas leaks.
• Do not ground units to water pipes, telephone wires, or lightning rods, as incomplete grounding could cause severe shock hazard. Do not ground to gas pipes, as a gas leak could cause an explosion.
• Dispose of packing materials safely. Nails and metal/wooden parts can cause stabs. Tear apart plastic bags so children do not play with them, as they pose a suffocation risk.
• Do not install the unit in areas with flammable materials due to explosion risk.

WARNING Details:

• Installation must be performed by an authorized dealer or trained professional. Improper installation can cause water leakage, electrical shock, fire, or equipment damage.
• Install the air conditioner according to this manual. Incomplete installation can lead to water leakage, electrical shock, fire, or equipment damage.
• Use only supplied or specified installation parts. Other parts may cause the unit to fall, or lead to water leakage, electrical shock, fire, or equipment damage.
• Install on a solid, level base that can support the unit's weight. An inadequate base can cause injury or equipment damage if the unit falls.
• Electrical work must comply with national, state, and local wiring codes. Insufficient capacity or incomplete electrical work can cause electrical shock, fire, or equipment damage.
• Use a dedicated power circuit. Never share a power supply with another appliance. Follow all electrical codes.
• For wiring, use cables long enough to cover the distance without splices if possible. Do not use extension cords. Do not put other loads on the power supply. Use a separate dedicated power circuit to avoid abnormal heat, electric shock, fire, or equipment damage.
• Use specified wire types for connections between indoor and outdoor units, following all electrical codes. Firmly clamp inter-unit wires to prevent external stress on terminals. Incomplete connections can cause terminal overheating, fire, or equipment damage.
• After wiring, shape cables to avoid undue stress on electrical covers, panels, or terminals. Install covers over wires.
• When installing or relocating, keep the refrigerant circuit free of substances other than R410A refrigerant, such as air. Air in the circuit can cause abnormal pressure rise, potentially leading to rupture and injury.
• During pump down, stop the compressor before removing refrigerant piping. If the compressor is running and the stop valve is open, air can be sucked in, causing high pressure and potential damage or injury.
• During installation, securely attach refrigerant piping before running the compressor. If pipes are not attached and the stop valve is open, air can be sucked in, causing high pressure and potential damage or injury.
• Install a ground fault circuit interrupter. Failure to do so may result in electrical shocks, fire, or personal injury.

CAUTION Details:

• Do not install where gas leakage could be exposed to open flames. Leaked gas may ignite.
• Establish drain piping as instructed. Inadequate piping may cause water damage.
• Tighten flare nuts to the specified torque using a torque wrench. Overtightening can crack the nut and cause refrigerant leakage.
• Do not touch heat exchanger fins, as improper handling may result in injury.
• Handle product transportation carefully. Do not use PP bands for transportation as it is dangerous.
• Electrical work must be performed by authorized personnel according to NEC/CEC.

Accessories

Accessories supplied with the indoor unit:

*1 Only for FTX(K)09/12/18/24*
*2 09/12 class: without frame, 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 specified in "Indoor unit installation drawings" 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 fluorescent lamps in the room and find a location where the remote controller signals are properly received by the indoor unit (within 23ft (7m)).

Indoor Unit Installation Drawings

Parts shown:

• A: Mounting plate
• B: Mounting plate fixing screw (3/16" x 1", M4 x 25mm)
• Air filters
• C: Titanium apatite photocatalytic air-purifying filter (2)
• D: Wireless remote controller
• E: Remote controller holder
• F: Fixing screw for remote controller holder (1/8" x 13/16", M3 x 20mm)

Indoor Unit Installation

1. Installing the mounting plate

The mounting plate must be installed on a wall capable of supporting the indoor unit's weight. Ensure the plate is level before marking drill points. Secure it with screws.

Key dimensions and features shown:

• Recommended mounting plate retention spots (7 spots).
• Tabs for placing a leveler.
• Through-the-wall hole size: 2-9/16" (65mm) for 09/12 class, 3-1/8" (80mm) for 18/24 class.
• Drain hose position.
• Gas pipe end and liquid pipe end locations.
• A mounting plate label.
• Instructions to use a tape measure for positioning.

2. Drilling a wall hole and installing wall embedded pipe

For metal frame or board walls, use a wall embedded pipe and hole cover to prevent heat, electrical shock, or fire. Caulk gaps around pipes to prevent water leakage.

1. Drill a feed-through hole: 2-9/16" (65mm) diameter for 09/12 class, 3-1/8" (80mm) for 18/24 class, angled downwards towards the outside.
2. Insert a wall embedded pipe into the hole.
3. Insert a wall hole cover into the wall pipe.
4. After completing piping, wiring, and drain piping, caulk the pipe hole gap with putty.

3. Installing the indoor unit

Handle refrigerant pipes with care to avoid abnormal sound. Do not press pipes strongly onto the bottom frame or front grille.

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 (J).
3. Pass the drain hose and refrigerant pipes through the wall hole. Set the indoor unit on the mounting plate (A) hooks, using the markings 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 to the front of the indoor unit. Bend cable tie wires upward for easier work.
6. Press the bottom frame of the indoor unit to set it on the mounting plate hooks, ensuring wire leads do not catch.

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

How to replace the drain plug and drain hose:

1. Remove the fixing screw of the drain hose on the right and remove the hose.
2. Remove the drain plug on the left side and attach it to the right side.
3. Insert the drain hose and tighten with the fixing screw. Forgetting to tighten may cause water leakage.

1. Attach the drain hose to the underside of the refrigerant pipes with adhesive vinyl tape.
2. Connect the drain plug to the drain port in place of the drain hose if no drain hose is used.
3. Shape the refrigerant pipes along the pipe path marking on the mounting plate (A).
4. Pass the drain hose and refrigerant pipes through the wall hole, then position the indoor unit on the mounting plate (A) hooks.
5. Pull in the inter-unit wire.
6. Connect the inter-unit pipes.
7. If pulling the drain hose through the back, wrap pipes and hose together with insulation tape.
8. Press the bottom edge of the indoor unit firmly onto the mounting plate hooks. Secure the unit with indoor unit fixing screws (H).

3-3. Wall embedded piping

Follow instructions for left-side, left-back, or left-bottom piping. Insert the drain hose to a depth that prevents it from being pulled out of the drain pipe.

4. Wiring

Insert wires, including the ground wire, into the conduit and secure with a lock nut. Strip wire ends to 3/4 inch (20mm). Match wire colours to terminal numbers on indoor and outdoor units and secure with screws. Connect the ground wire. Pull wires lightly to ensure they are secure. Shape wires so the service lid fits securely before closing it.

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. Install a ground fault circuit interrupter. Use an all-pole disconnection type circuit breaker. Do not pull at the conduit. Do not connect power wire to the indoor unit. Do not turn on the circuit breaker until all work is completed.

5. Drain piping

Connect the drain hose as described. Check water flow by pouring water into the drain pan after removing air filters.

If drain hose extension or embedded piping is required, use appropriate parts. For extending the drain hose, use a commercially available hose with a 5/8 inch (16mm) inner diameter and thermally insulate the indoor section.

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.
3. Put the flare nut on the pipe.
4. Flare the pipe.
5. Check that the flaring is properly made.

WARNING: Do not use mineral oil on flared parts. Prevent mineral oil from entering the system. Never use previously installed piping. Never install a drier. Incomplete flaring may cause refrigerant gas leakage.

2. Refrigerant piping

CAUTION: Use the flare nut fixed to the main unit. Apply refrigeration oil only to the inner surface of the flare for R410A. Use a torque wrench when tightening flare nuts.

Align flares and tighten nuts 3-4 turns by hand, then fully with a spanner and torque wrench.

2-1. Caution on piping handling

• Protect pipe ends from dust and moisture.
• Make pipe bends gently; 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 according to the dimensions below.

Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

Installation Tips

1. Removing and installing the front panel

Removal method:

1. Place fingers in indentations on the unit sides and open the front panel.
2. Push the left side front panel shaft outward, then push up and remove the panel. Repeat for the right side.
3. Pull the front panel towards you to remove it.

Installation method:

1. Align the front panel shaft with the grill grooves and push in fully.
2. Close slowly, pushing the center of the lower panel surface firmly to engage hooks.

2. Removing and installing the front grille

Removal method:

1. Remove the front panel to access the air filter.
2. Remove 2 screws from the front grille (3 screws for 18/24 class models).
3. Locate 3 upper hooks in front of the mark on the grille. Pull the grille towards you with one hand and push down on the hooks with the other.

CAUTION: Be sure to wear protection gloves. If workspace is limited near the ceiling, place both hands under the center of the front grille, push up, and pull towards you.

Installation method:

1. Install the front grille, engaging the upper hooks (3 locations).
2. Install 2 screws for the front grille (3 screws for 18/24 class models).
3. Install the air filter and then mount the front panel.

3. How to set the different addresses

When two indoor units are in one room, set remote controllers to different addresses. Be careful not to damage surrounding parts when cutting jumpers.

1. Remove the battery cover on the remote controller and cut the address jumper.
2. Press TEMP °F/°C and OFF simultaneously.
3. Press TEMP °F/°C, select '7', then press FAN. (The indoor unit OPERATION lamp will blink for about 1 minute.)
4. Press the indoor unit ON/OFF switch while the OPERATION lamp is blinking.

If setting fails, repeat from the beginning. Pressing FAN for 5 seconds after setting completes returns the remote controller to the previous display.

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 mode, select the lowest programmable temperature; in HEAT mode, select the highest.
• Perform trial operation per the operation manual to ensure all functions work correctly. The system disables restart operation for 3 minutes after being turned off.
• After trial operation, set the temperature to a normal level (78-82°F / 26-28°C in COOL; 68-75°F / 20-24°C in HEAT).

To set trial operation mode (e.g., COOL in winter or HEAT in summer):

1. Press TEMP °F/°C and OFF simultaneously.
2. Press TEMP °F/°C, select '7', then press FAN.
3. Press COOL or HEAT to turn on the system.

Trial operation stops automatically after about 30 minutes. Press OFF to stop manually. Some functions may not be available in trial mode.

The air conditioner draws minimal power in standby. Shut off the circuit breaker if the system will not be used for an extended period. If the circuit breaker trips, the system will restore its previous operation mode when power is restored.

2. Test items

Wiring

WARNING: Do not use tapped wires, extension cords, or starburst connections. Do not use locally purchased electrical parts. Install a ground fault circuit interrupter capable of handling harmonics. Use an all-pole disconnection type circuit breaker with at least 1/8 inch (3mm) contact gap. Do not pull at the conduit. Do not connect power wire to the indoor unit. Do not turn on the circuit breaker until all work is completed.

1. Strip wire insulation (3/4 inch / 20mm).
2. Connect inter-unit wires, matching terminal numbers. Tighten screws securely.

CAUTION: When using stranded wires for power supply wiring, use round crimp-style terminals. When connecting inter-unit wires with single core wire, curl the end to prevent heat and fires.

Facility Setting* (cooling at low outdoor temperature)

*Only for RX and RK models. This function is for facilities (e.g., computer equipment), not residences or offices.

Cutting jumper 6 (J6) on the circuit board expands the operation range down to 5°F (-15°C). Operation stops if outdoor temperature drops below -4°F (-20°C) and resumes when it rises.

1. Remove the top plate of the outdoor unit (09/12 class: 3 screws, 18/24 class: 6 screws).
2. Remove the front plate (09/12 class: 4 screws, 18/24 class: 8 screws).
3. Cut jumper (J6) on the PCB inside.

CAUTION: If the outdoor unit heat exchanger is exposed to direct wind, provide a windbreak. Intermittent noises may occur due to outdoor fan cycling. Do not place humidifiers nearby, as this can cause dew jumping. Cutting jumper J6 sets the indoor fan tap to the highest position; notify the user.

Pump Down Operation

To protect the environment, pump down refrigerant when relocating or disposing of the unit.

1. Remove valve caps from liquid and gas stop valves.
2. Carry out forced cooling operation.
3. After 5-10 minutes, close the liquid stop valve with a hexagonal wrench.
4. After 2-3 minutes, close the gas stop valve and stop forced cooling operation.

Forced cooling operation:

• Using indoor unit ON/OFF switch: Press for at least 5 seconds. Stops automatically after ~15 minutes.
• Using remote controller: 1) Press TEMP °F/°C and OFF. 2) Press TEMP °F/°C, select '7', press FAN. 3) Press COOL. Stops automatically after ~30 minutes. Press OFF to stop manually.

CAUTION: Do not touch the terminal block when pressing the switch, as it has high voltage. Close the gas stop valve within 3 minutes after closing the liquid stop valve.

Outdoor Unit Installation

1. Installing the outdoor unit

Refer to "Precautions for Selecting the Location" and "Outdoor Unit Installation Drawings". If drain work is necessary, follow the procedures below.

2. Drain work (only for heat pump models)

If the drain port is covered by a base or floor, use additional foot bases (at least 1-1/4" / 30mm high). In cold areas, do not use drain socket, caps, or hose to prevent freezing and impaired heating performance.

1. Attach drain cap (1) and drain cap (2).
2. Attach drain socket (B).

3. Flaring the pipe end

Follow the same procedure as described in "Refrigerant Piping Work" on page 9.

4. Refrigerant piping

Follow the same procedure as described in "Refrigerant Piping Work" on page 9.

5. Pressure test and evacuating system

WARNING: Do not mix substances other than R410A. Ventilate rooms if leaks occur. Recover refrigerants properly. Use a vacuum pump exclusively for R410A.

After piping work, perform a pressure test and evacuate the system with a vacuum pump. If adding refrigerant, purge air first. Use a hexagonal wrench (3/16" / 4mm) for stop valves. Tighten all pipe joints with a torque wrench.

1. Pressurize liquid and gas pipes to 550psi (3.8MPa) for 1-24 hours. Check for leaks and repair if necessary.
2. Connect charging hose to gas stop valve service port.
3. Open low-pressure valve (Lo), close high-pressure valve (Hi).
4. Evacuate system to below 500 microns for 1 hour.
5. Close Lo valve, stop vacuum pump. Monitor pressure for a few minutes.
6. Remove valve covers.
7. Turn liquid stop valve rod 90° counter-clockwise to open. Close after 5 seconds. Check for gas leaks using soapy water. Wipe off soapy water.
8. Disconnect charging hose, fully open liquid and gas stop valves.
9. Tighten valve caps and service port caps with a torque wrench.

*If pressure gauge pointer swings back, refrigerant may have water content or a loose joint. Retighten nuts and repeat steps 3-5.

6. Refilling refrigerant

Check machine nameplate for refrigerant type. Add R410A in liquid form. Adding as gas can change composition and prevent normal operation. Check cylinder for siphon attachment before filling.

Use R410A tools for pressure and to prevent foreign objects.

7. Refrigerant piping work

7-1. Cautions on pipe handling

• Protect pipe ends from dust and moisture.
• Make pipe bends gently using a pipe bender.

7-2. Selection of copper and heat insulation materials

Follow the same material selection and insulation dimensions as described in "Refrigerant Piping Work" on page 10.

Precautions on Installation

Check installation surface strength and levelness to prevent vibration or noise. Secure the unit with foundation bolts (M8 or M10, 4 sets recommended). Screw bolts until ends are 3/4 inch (20mm) from the surface.

Outdoor Unit Installation Drawings

* Additional refrigerant required for pipe length exceeding 32.8ft (10m): 0.21oz/ft (20g/m).

*Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.

**The suggested shortest pipe length is 10ft (3m) to avoid noise and vibration.

CAUTION: Keep piping length between specified limits (e.g., 10ft to 65-5/8ft for RX09/12). Allow space for piping and electrical servicing. In sites with poor drainage, use block bases and adjust foot height to ensure the unit is level to prevent water leakage.

WARNING: If there is a danger of the unit falling, use foot bolts or wires.

Installation Guidelines

Follow these guidelines where walls or obstacles affect outdoor unit airflow. The wall height on the outlet side should be 47-1/4 inch (1200mm) or less.

Outdoor Unit Installation Details

1. Installing the outdoor unit

Refer to "Precautions for Selecting the Location" and "Outdoor Unit Installation Drawings".

2. Drain work (only for heat pump models)

Attach drain cap (1) and (2), and drain socket (B).

3. Flaring the pipe end

Refer to "Refrigerant Piping Work" on page 9.

4. Refrigerant piping

Refer to "Refrigerant Piping Work" on page 9.

5. Pressure test and evacuating system

WARNING: Do not mix substances other than R410A. Ventilate rooms if leaks occur. Recover refrigerants properly. Use a vacuum pump exclusively for R410A.

After piping work, perform a pressure test and evacuate the system with a vacuum pump. If adding refrigerant, purge air first. Use a hexagonal wrench (3/16" / 4mm) for stop valves. Tighten all pipe joints with a torque wrench.

1. Pressurize liquid and gas pipes to 550psi (3.8MPa) for 1-24 hours. Check for leaks and repair if necessary.
2. Connect charging hose to gas stop valve service port.
3. Open low-pressure valve (Lo), close high-pressure valve (Hi).
4. Evacuate system to below 500 microns for 1 hour.
5. Close Lo valve, stop vacuum pump. Monitor pressure for a few minutes.
6. Remove valve covers.
7. Turn liquid stop valve rod 90° counter-clockwise to open. Close after 5 seconds. Check for gas leaks using soapy water. Wipe off soapy water.
8. Disconnect charging hose, fully open liquid and gas stop valves.
9. Tighten valve caps and service port caps with a torque wrench.

*If pressure gauge pointer swings back, refrigerant may have water content or a loose joint. Retighten nuts and repeat steps 3-5.

6. Refilling refrigerant

Check machine nameplate for refrigerant type. Add R410A in liquid form. Adding as gas can change composition and prevent normal operation. Check cylinder for siphon attachment before filling.

Use R410A tools for pressure and to prevent foreign objects.

7. Refrigerant piping work

7-1. Cautions on pipe handling

• Protect pipe ends from dust and moisture.
• Make pipe bends gently using a pipe bender.

7-2. Selection of copper and heat insulation materials

Follow the same material selection and insulation dimensions as described in "Refrigerant Piping Work" on page 10.

Precautions on Installation

Check installation surface strength and levelness to prevent vibration or noise. Secure the unit with foundation bolts (M8 or M10, 4 sets recommended). Screw bolts until ends are 3/4 inch (20mm) from the surface.

Outdoor Unit Installation Drawings

* Additional refrigerant required for pipe length exceeding 32.8ft (10m): 0.21oz/ft (20g/m).

*Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.

**The suggested shortest pipe length is 10ft (3m) to avoid noise and vibration.

CAUTION: Keep piping length between specified limits (e.g., 10ft to 65-5/8ft for RX09/12). Allow space for piping and electrical servicing. In sites with poor drainage, use block bases and adjust foot height to ensure the unit is level to prevent water leakage.

WARNING: If there is a danger of the unit falling, use foot bolts or wires.

Installation Guidelines

Follow these guidelines where walls or obstacles affect outdoor unit airflow. The wall height on the outlet side should be 47-1/4 inch (1200mm) or less.

Outdoor Unit Installation Details

1. Installing the outdoor unit

Refer to "Precautions for Selecting the Location" and "Outdoor Unit Installation Drawings".

2. Drain work (only for heat pump models)

Attach drain cap (1) and (2), and drain socket (B).

3. Flaring the pipe end

Refer to "Refrigerant Piping Work" on page 9.

4. Refrigerant piping

Refer to "Refrigerant Piping Work" on page 9.

5. Pressure test and evacuating system

WARNING: Do not mix substances other than R410A. Ventilate rooms if leaks occur. Recover refrigerants properly. Use a vacuum pump exclusively for R410A.

After piping work, perform a pressure test and evacuate the system with a vacuum pump. If adding refrigerant, purge air first. Use a hexagonal wrench (3/16" / 4mm) for stop valves. Tighten all pipe joints with a torque wrench.

1. Pressurize liquid and gas pipes to 550psi (3.8MPa) for 1-24 hours. Check for leaks and repair if necessary.
2. Connect charging hose to gas stop valve service port.
3. Open low-pressure valve (Lo), close high-pressure valve (Hi).
4. Evacuate system to below 500 microns for 1 hour.
5. Close Lo valve, stop vacuum pump. Monitor pressure for a few minutes.
6. Remove valve covers.
7. Turn liquid stop valve rod 90° counter-clockwise to open. Close after 5 seconds. Check for gas leaks using soapy water. Wipe off soapy water.
8. Disconnect charging hose, fully open liquid and gas stop valves.
9. Tighten valve caps and service port caps with a torque wrench.

*If pressure gauge pointer swings back, refrigerant may have water content or a loose joint. Retighten nuts and repeat steps 3-5.

6. Refilling refrigerant

Check machine nameplate for refrigerant type. Add R410A in liquid form. Adding as gas can change composition and prevent normal operation. Check cylinder for siphon attachment before filling.

Use R410A tools for pressure and to prevent foreign objects.

7. Refrigerant piping work

7-1. Cautions on pipe handling

• Protect pipe ends from dust and moisture.
• Make pipe bends gently using a pipe bender.

7-2. Selection of copper and heat insulation materials

Follow the same material selection and insulation dimensions as described in "Refrigerant Piping Work" on page 10.

Precautions on Installation

Check installation surface strength and levelness to prevent vibration or noise. Secure the unit with foundation bolts (M8 or M10, 4 sets recommended). Screw bolts until ends are 3/4 inch (20mm) from the surface.

Outdoor Unit Installation Drawings

* Additional refrigerant required for pipe length exceeding 32.8ft (10m): 0.21oz/ft (20g/m).

*Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.

**The suggested shortest pipe length is 10ft (3m) to avoid noise and vibration.

CAUTION: Keep piping length between specified limits (e.g., 10ft to 65-5/8ft for RX09/12). Allow space for piping and electrical servicing. In sites with poor drainage, use block bases and adjust foot height to ensure the unit is level to prevent water leakage.

WARNING: If there is a danger of the unit falling, use foot bolts or wires.

Installation Guidelines

Follow these guidelines where walls or obstacles affect outdoor unit airflow. The wall height on the outlet side should be 47-1/4 inch (1200mm) or less.

Outdoor Unit Installation Details

1. Installing the outdoor unit

Refer to "Precautions for Selecting the Location" and "Outdoor Unit Installation Drawings".

2. Drain work (only for heat pump models)

Attach drain cap (1) and (2), and drain socket (B).

3. Flaring the pipe end

Refer to "Refrigerant Piping Work" on page 9.

4. Refrigerant piping

Refer to "Refrigerant Piping Work" on page 9.

5. Pressure test and evacuating system

WARNING: Do not mix substances other than R410A. Ventilate rooms if leaks occur. Recover refrigerants properly. Use a vacuum pump exclusively for R410A.

After piping work, perform a pressure test and evacuate the system with a vacuum pump. If adding refrigerant, purge air first. Use a hexagonal wrench (3/16" / 4mm) for stop valves. Tighten all pipe joints with a torque wrench.

1. Pressurize liquid and gas pipes to 550psi (3.8MPa) for 1-24 hours. Check for leaks and repair if necessary.
2. Connect charging hose to gas stop valve service port.
3. Open low-pressure valve (Lo), close high-pressure valve (Hi).
4. Evacuate system to below 500 microns for 1 hour.
5. Close Lo valve, stop vacuum pump. Monitor pressure for a few minutes.
6. Remove valve covers.
7. Turn liquid stop valve rod 90° counter-clockwise to open. Close after 5 seconds. Check for gas leaks using soapy water. Wipe off soapy water.
8. Disconnect charging hose, fully open liquid and gas stop valves.
9. Tighten valve caps and service port caps with a torque wrench.

*If pressure gauge pointer swings back, refrigerant may have water content or a loose joint. Retighten nuts and repeat steps 3-5.

6. Refilling refrigerant

Check machine nameplate for refrigerant type. Add R410A in liquid form. Adding as gas can change composition and prevent normal operation. Check cylinder for siphon attachment before filling.

Use R410A tools for pressure and to prevent foreign objects.

7. Refrigerant piping work

7-1. Cautions on pipe handling

• Protect pipe ends from dust and moisture.
• Make pipe bends gently using a pipe bender.

7-2. Selection of copper and heat insulation materials

Follow the same material selection and insulation dimensions as described in "Refrigerant Piping Work" on page 10.

Trial Operation and Testing

1. Trial operation and testing

Trial operation should be carried out in either COOL or HEAT operation.

• Measure the supply voltage and make sure that it is within the specified range.
• In COOL operation, select the lowest programmable temperature; in HEAT operation, select the highest programmable temperature.
• Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly. For protection, the system disables restart operation for 3 minutes after it is turned off.
• After trial operation is complete, set the temperature to a normal level (78°F to 82°F (26°C to 28°C) in COOL operation, 68°F to 75°F (20°C to 24°C) in HEAT operation).

When operating the air conditioner in COOL operation in winter, or HEAT operation in summer, set it to the trial operation mode using the following method:

1. Press TEMP °F/°C and OFF at the same time.
2. Press TEMP °F/°C, then select '7', press FAN.
3. Press COOL or HEAT to turn on the system.

Trial operation will stop automatically after about 30 minutes. To stop the operation, press OFF. Some functions cannot be used in the trial operation mode.

The air conditioner draws a small amount of power in its standby mode. If the system is not to be used for some time after installation, shut off the circuit breaker to eliminate unnecessary power consumption. If the circuit breaker trips, the system will restore the original operation mode when the circuit breaker is opened again.

2. Test items

Precautions for Selecting the Location (Outdoor Unit)

Choose a solid place for the unit to bear weight and vibration without amplifying operating sound. Avoid locations that would cause nuisance to neighbors. Avoid places near bedrooms. Ensure sufficient space for carrying the unit in/out and for air passage. The site must be free from flammable gas leakage. Install units, power cords, and inter-unit wire at least 10ft (3m) away from TVs and radios to prevent interference. In coastal areas or places with salty atmosphere/sulphate gas, corrosion may shorten the unit's life. Since water drains from the outdoor unit, do not place anything sensitive to moisture underneath it.

NOTE: Cannot be installed suspended from ceiling or stacked.

CAUTION: For low outdoor ambient temperatures, install the outdoor unit with its suction side facing the wall, away from direct wind. Consider a baffle plate on the air discharge side. In heavy snowfall areas, select a site where snow will not affect the unit.