Mitsubishi Electric MSZ-FS Series Split-Type Air Conditioner Installation Manual

1. BEFORE INSTALLATION

This section outlines essential safety precautions and instructions that must be followed before installing the Mitsubishi Electric MSZ-FS series split-type air conditioners. It is crucial to read and understand these guidelines to ensure safe and proper installation.

• Always read and observe all safety precautions and instructions provided in this manual.
• Store this manual with the OPERATING INSTRUCTIONS for future reference.
• Obtain consent from the power supply authority before connecting the equipment.
• WARNING: Improper or incomplete installation can lead to fire, electric shock, injury from unit falling, or water leakage. Consult a qualified installer or dealer.
• Use appropriate protective equipment and tools for safety during installation.
• Install the unit securely in a place that can bear its weight.
• Do not alter the unit, as this may cause fire, electric shock, injury, or water leakage.
• Perform electrical work according to the manual, using an exclusive circuit. Do not connect other appliances to the same circuit.
• Ensure correct grounding. Do not connect the ground wire to gas pipes, water pipes, lightning rods, or telephone ground wires.
• Take measures against leakage current if required.
• Do not damage wires, as damaged wires can cause fire.
• Shut off the main power before setting up indoor PC boards or wiring.
• Use specified wires to securely connect indoor and outdoor units, ensuring firm attachment to the terminal block to avoid stress.
• Do not install the unit where flammable gas may leak, as accumulation can cause an explosion.
• Do not use intermediate connections or extension cords for the power cord. Avoid connecting multiple devices to one AC outlet.
• Use only provided or specified parts for installation.
• Ensure the power supply plug and outlet are free of dust and debris, and that the plug is fully inserted.
• Securely attach electrical covers and service panels to prevent dust and water ingress, which could cause fire or electric shock.
• Ensure no substance other than the specified refrigerant (R410A) enters the refrigerant circuit. Foreign substances like air can cause abnormal pressure rise and potential explosion.
• Do not discharge refrigerant into the atmosphere. Ventilate the room if refrigerant leaks.
• Use appropriate tools and piping materials for R410A refrigerant due to its higher pressure.
• When pumping down refrigerant, stop the compressor before disconnecting pipes.
• Connect refrigerant pipes securely before starting the compressor.
• Fasten flare nuts with a torque wrench as specified; over-tightening can cause refrigerant leakage.
• Install the unit according to national wiring regulations.
• Exercise caution when opening/closing valves at freezing temperatures to avoid refrigerant spurting.
• Follow all third-party manufacturer instructions and safety guidelines for auxiliary heat sources. Auxiliary heat sources must have independent temperature control.
• CAUTION: Follow applicable codes to prevent electrical hazards. Perform drainage and piping work securely to prevent water damage.
• Do not touch air inlets or aluminum fins of the outdoor unit, as this could cause injury.
• Do not install the outdoor unit where small animals may live, as they can damage electrical parts and cause malfunctions or fire.

2. SELECTING THE INSTALLATION LOCATION

2-1. INDOOR UNIT

• Ensure unobstructed airflow.
• Place where cool or warm air can spread throughout the room.
• Mount on a rigid wall to minimize vibration.
• Avoid direct sunlight.
• Choose a location where drainage is easy.
• Position at least 3 ft. (1 m) away from TVs and radios to prevent interference.
• Place as far as possible from fluorescent and incandescent lights to ensure proper remote controller operation.
• Ensure easy access for air filter removal and replacement.
• Keep away from heat or steam sources.
• Install the indoor unit high on the wall for better air distribution.

2-2. REMOTE CONTROLLER

• Place where operation is convenient and visible.
• Ensure it is out of reach of children.
• Select a position about 4 ft. (1.2 m) above the floor.
• Verify signal reception with the indoor unit (audible beep).

2-3. OUTDOOR UNIT

• Locate where it is not overly exposed to strong winds.
• Ensure good airflow and minimal dust.
• Position to avoid annoying neighbors with operation sound or hot air.
• Use a rigid wall or support to prevent increased operational sound or vibration.
• Ensure no risk of combustible gas leakage.
• Secure the unit legs if installed at a height.
• Place at least 10 ft. (3 m) away from TV or radio antennas to prevent interference.
• Install the unit horizontally.
• Protect from snowfall or blowing snow; use a canopy, pedestal, or baffle boards in heavy snow areas.
• Avoid locations with flammable gas, excessive machine oil, oily smoke, salty air, sulfide gas, or high-frequency/wireless equipment.
• Avoid areas with high levels of VOCs that may cause chemical cracking.
• For efficiency, install where direct sunlight and excessive water can be avoided.
• When operating in low outside temperatures, ensure the air inlet/outlet is not directly exposed to wind. Use a baffle board if necessary.

3. SPECIFICATIONS

3-1. POWER SUPPLY AND INDOOR/OUTDOOR WIRE CONNECTION

• Use an exclusive branched circuit for power supply.
• Wiring work must comply with applicable technical standards.
• Follow wiring diagrams and securely tighten screws.
• Use solid or stranded conductor, Min. AWG14 for FS06/09/12 and Min. AWG12 for FS15/18.
• Use double insulated copper wire with 600 V insulation.
• Use copper conductors only.
• Follow local electrical codes.
• A disconnect switch may be required for the indoor unit power supply depending on local codes.

3-2. REFRIGERANT PIPES

• Insulate both refrigerant pipes to prevent condensation.
• Ensure a minimum bending radius of 4 in. (100 mm) for refrigerant pipes.
• Use insulation of the specified thickness to prevent improper installation or condensation.
• The unit has flared connections on both indoor and outdoor sides.
• Remove the valve cover from the outdoor unit before connecting pipes.
• Refrigerant pipes connect the indoor and outdoor units.
• Be careful not to crush or over-bend the pipes.
• If pipe length exceeds 25 ft. (7.5 m), additional refrigerant (R410A) is required. The outdoor unit is charged for up to 25 ft. (7.5 m).

4. INSTALLATION DIAGRAM

This section provides diagrams and details for the installation process.

4-1. ACCESSORIES

Verify the following parts before installation:

Indoor unit accessories:

• (1) Installation plate
• (2) Attachment screws for the installation plate (4 x 25 mm)
• (3) Wireless remote controller
• (4) Felt tape (for left or left-rear piping)
• (5) Remote controller holder
• (6) Screws for the remote controller holder (3.5 x 16 mm, Black)
• (7) Battery (AAA) for controller
• (8) Air cleaning filter

4-2. FIELD-SUPPLIED PARTS

• (A) Indoor/outdoor unit connecting wire
• (B) Extension pipe
• (C) Wall hole sleeve
• (D) Wall hole cover
• (E) Pipe attachment strap
• (F) Screw for strap (4 x 20 mm)
• (G) Piping tape
• (H) Putty
• (I) Drain hose (soft PVC hose, 19/32 in. [15 mm] inner diameter or hard PVC pipe VP16)
• (J) Refrigerant oil
• (K) Power supply cord

Note: Keep indoor/outdoor unit connecting wire (A) and power supply cord (K) at least 3 ft. (1 m) away from the TV antenna wire.

4-3. OUTDOOR UNIT CLEARANCES

Diagrams illustrate required clearances for the FS06/09/12 and FS15/18 models, showing minimum distances for air inlet and outlet when the unit is clear on front/sides or front/sides/rear.

4-4. DRAIN PIPING FOR OUTDOOR UNIT

• Install the unit horizontally.
• Do not use drain sockets in cold regions where drain may freeze.
• The outdoor unit produces condensate during heating operation; ensure drain water does not cause damage or freezing.

Note: The dimensions shown in the arrows indicate required space for performance. Consider future relocation, service, or repairs. Poor ventilation may reduce cooling/heating performance and efficiency by approximately 10%. An air outlet guide (optional) can improve performance. Air blowing against a wall may cause stains.

Important: Do not take in the outlet air discharged by other units directly.

5. INDOOR UNIT INSTALLATION

5-1. ATTACHING THE INSTALLATION PLATE

• Locate a wall stud and attach the installation plate horizontally using fixing screws.
• Ensure screws are installed in the indicated holes for stability. Additional screws may be used for support.
• For concrete walls, use recessed bolts with oval holes (17-3/4 in. [450 mm] pitch).
• If recessed bolts are too long, use shorter ones.

5-2. DRILLING

• Determine hole locations on the wall.
• Drill a ø3 in. (75 mm) hole. The outdoor side should be 6/32 to 9/32 in. (5 to 7 mm) lower than the indoor side.
• Insert the wall hole sleeve (C).

5-3. CONNECTING WIRES FOR INDOOR UNIT

• Installation must be done by a licensed contractor/electrician. A disconnect switch may be required.
• Remove the panel assembly.
• Place the upper part of the indoor unit on the installation plate.
• Remove corner box and electrical cover.
• Remove display and i-see sensor assembly, conduit cover, and conduit plate.
• Attach straight joint (rear piping) or elbow joint (right, left, downward piping) to the conduit plate with a lock nut. Ensure threads inside are less than 3/8 in. (10 mm) and outside less than 1-3/16 in. (30 mm).
• Process the ground wire end and connect it to the ground terminal of the electrical parts box.
• Process the indoor/outdoor unit connecting wire (A) end and attach it to the terminal block. Ensure secure connection, no visible core, and no external force on the terminal block.
• Firmly tighten terminal screws and verify wire security.
• Reinstall conduit plate, conduit cover, and display panel.
• Remove shaded parts of corner boxes as needed for piping direction. Reinstall electrical cover, corner box, and front panel.
• Remark: A disconnect switch may be required; check local codes. Use a ring tongue terminal for the ground wire.
• Ensure the power supply cord (K) and indoor/outdoor unit connecting wire (A) are properly connected to the terminal block.
• Leave some slack in connecting wires for future servicing.
• Ensure each screw is attached to its corresponding terminal.

Diagrams illustrate wire connections for indoor and outdoor units, including grounding terminals and power supply.

6. PIPE FORMING AND DRAIN PIPING

6-1. PIPE FORMING

• Place the drain hose below the refrigerant piping.
• Ensure the drain hose is not crowded or bent.
• Do not pull the hose when applying tape.
• Wrap the drain hose with insulation material if it passes through a room.
• Ensure not to damage the refrigerant pipe cover when reattaching it.
• Use felt tape (4) and piping tape (G) as shown in diagrams.
• Left or left-rear piping: Reattach drain hose and cap if piping is on the left or bottom left. Follow steps to attach drain cap and hose, ensuring secure connection. Use a spacer if needed to lift the unit for easier piping placement. Connect refrigerant piping with extension pipe (B).
• Rear or bottom piping: Assemble piping and drain hose, apply tape, insert into wall sleeve, and attach the indoor unit. Check for secure attachment.
• Right piping: Assemble piping and drain hose, shift to the left, apply tape, insert into wall sleeve, and attach the indoor unit. Check for secure attachment.

6-2. DRAIN PIPING

• Wrap the extension drain hose with insulation if it passes through a room.
• Ensure the drain hose points downward for proper drainage.
• If the provided drain hose is too short, connect a field-supplied drain hose.
• When connecting to a hard vinyl chloride pipe, insert securely.
• Avoid improper drain piping: Do not direct the hose upward, do not let the tip of the drain hose sit in water, and ensure adequate gap between the hose and any ditch to prevent water leakage or siphoning.

7. OUTDOOR UNIT INSTALLATION

7-1. CONNECTING WIRES FOR OUTDOOR UNIT

• Remove the service panel and conduit cover.
• Attach conduit connectors to the conduit plate with lock nuts.
• Connect ground wires of the indoor/outdoor unit connecting wire (A) and power supply cord (K) to the TB support.
• Loosen terminal screws, then attach the indoor/outdoor unit connecting wire (A) and power supply cord (K) to the terminal block. Ensure secure connections without visible cores and no external force on the terminal block.
• Firmly tighten terminal screws and verify wire security.
• Install the conduit cover and securely reinstall the service panel.
• Note: Leave some slack in connecting wires for future servicing. Ensure each screw is attached to its corresponding terminal.

7-2. FLARE CONNECTION

• Cut copper pipe straight using a pipe cutter.
• Remove burrs from the cut section, preventing metal shavings from entering the piping.
• Remove flare nuts from units and place them on the pipe.
• Perform flaring work according to the specified dimensions and tool type.
• Compare the flared work with the provided figure; if defective, recut and repeat.
• Ensure the flare is smooth, even, and free of burrs.
• Tighten flare nuts using a torque wrench according to the table provided, ensuring correct torque values for R410A to prevent leakage.

8. PIPE CONNECTION

• Fasten flare nuts with a torque wrench as specified. Over-tightening can cause refrigerant leakage.
• Wrap piping with insulation. Direct contact with bare piping can cause burns or frostbite.
• Connect both liquid and gas pipes to the indoor unit.
• Apply a thin coat of refrigerant oil (J) to flared ends of pipes, not screw threads.
• Align the center and hand-tighten flare nuts for 3-4 turns. Use a torque wrench for final tightening.
• Connect pipes to the stop valve pipe joint of the outdoor unit similarly.
• Use a torque wrench or spanner for tightening.
• WARNING: Securely connect refrigerant pipes before starting the compressor.

9. INSULATION AND TAPING

• Cover piping joints with pipe cover.
• Insulate piping, including valves, for the outdoor unit side.
• Apply piping tape (G) starting from the outdoor unit connection.
• Use additional insulation if piping passes through areas with high temperature and humidity to prevent condensation.

10. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

10-1. PURGING PROCEDURES AND LEAK TEST

• Remove service port caps from stop valves.
• Connect the gauge manifold to the service ports.
• Evacuate the system to 4000 microns, then break vacuum with Nitrogen (N2) to 0 PSIG.
• Repeat evacuation to 1500 microns and 500 microns.
• Close gauge manifold valves, stop the pump, and conduct a 30-minute rise test.
• The system should hold 500 microns for at least 1 hour.
• Fully open all stop valves on both gas and liquid pipes.
• Charge additional refrigerant if needed, referring to section 1-3. Charge slowly with liquid refrigerant.
• Remove gauge manifolds and replace service port caps.
• Perform a leak test.

10-2. TEST RUN

• Insert the power supply plug or turn on the breaker.
• Press the E.O. SW for COOL (once) or HEAT (twice) operation. The test run will last 30 minutes.
• If the left operation indicator lamp blinks, check for mis-wiring.
• After the test run, the unit enters emergency mode (24°C).
• To stop operation, press the E.O. SW until all lamps turn off.
• Checking remote signal reception: Press ON/OFF on the remote controller. Listen for an audible signal. Press again to turn off. The compressor has a 3-minute restart delay.
• Auto Restart Function: The unit will restart with previous settings after a power outage. Consult the service representative to deactivate if unnecessary.
• Setting Installation Position: Adjust the remote controller based on the indoor unit's position (Left, Center, Right) using the WIDE VANE button.
• Explanation to the User: Explain operation, filter removal, remote controller use, cleaning, and precautions using the OPERATING INSTRUCTIONS.

11. RELOCATION AND MAINTENANCE

11-1. REMOVING AND INSTALLING THE PANEL ASSEMBLY

• Follow the illustrated steps to unlock and remove vanes, then the front panel and panel assembly components (right, left, center bottom).
• Reinstall in reverse order, ensuring components are fully attached.

11-2. REMOVING THE INDOOR UNIT

• Remove the bottom of the indoor unit from the installation plate, then pull it downward and forward.

11-3. PUMPING DOWN

• To pump down the system before relocating or disposing of the unit, connect the gauge manifold to the gas pipe stop valve.
• Fully close the liquid pipe stop valve.
• Almost completely close the gas pipe stop valve until the pressure gauge shows 0 psi [Gauge] (0 Mpa).
• Start emergency COOL operation (disconnect power, wait 15 seconds, reconnect power, press E.O. SW once). This can run for up to 30 minutes.
• Fully close the gas pipe stop valve when the pressure gauge shows 0.1 to 0 psi [Gauge] (0.05 to 0 Mpa).
• Stop the emergency COOL operation.
• WARNING: Stop the compressor before disconnecting refrigerant pipes during pumping down to prevent compressor damage.

12. SPECIFICATIONS

12-1. ELECTRICAL SPECIFICATIONS

Tables detail electrical specifications for indoor and outdoor units, including power supply, ampacity, fan motor current, fuse size, compressor ratings, and control voltage.

12-2. REFRIGERANT PIPES

Details on pipe diameter, wall thickness, insulation thickness, and material are provided. Limits for pipe length and height difference are specified, along with requirements for additional refrigerant based on pipe length.

13. INSTALLATION DIAGRAM

Diagrams illustrate the layout and connection points for indoor and outdoor units, including accessories and field-supplied parts.

13-1. ACCESSORIES

List of included accessories with quantities.

13-2. FIELD-SUPPLIED PARTS

List of parts to be supplied by the installer.

13-3. OUTDOOR UNIT CLEARANCES

Diagrams show required clearances for different models to ensure proper airflow and performance.

13-4. DRAIN PIPING FOR OUTDOOR UNIT

Instructions for horizontal installation and considerations for condensate drainage.

14. INDOOR UNIT INSTALLATION

14-1. ATTACHING THE INSTALLATION PLATE

Instructions for securely mounting the installation plate to the wall.

14-2. DRILLING

Guidance on drilling the wall hole for piping, ensuring the correct slope.

14-3. CONNECTING WIRES FOR INDOOR UNIT

Detailed steps for connecting wires, including grounding and terminal block connections. Diagrams illustrate the process.

15. PIPE FORMING AND DRAIN PIPING

15-1. PIPE FORMING

Instructions for forming refrigerant pipes and drain hoses, including insulation and taping methods for different piping directions (left/left-rear, rear/bottom, right).

15-2. DRAIN PIPING

Guidance on drain piping, ensuring downward slope and proper connection of extension hoses. Examples of incorrect drain piping are shown.

16. OUTDOOR UNIT INSTALLATION

16-1. CONNECTING WIRES FOR OUTDOOR UNIT

Steps for connecting wires to the outdoor unit's terminal block, including grounding and power supply connections.

16-2. FLARE CONNECTION

Detailed instructions for creating flare connections, including pipe cutting, deburring, flaring, and tightening torque specifications.

17. PIPE CONNECTION

• Connect pipes to the indoor and outdoor units, ensuring proper flare nut tightening.
• Insulate all piping to prevent burns or frostbite.
• WARNING: Securely connect refrigerant pipes before starting the compressor.

18. INSULATION AND TAPING

• Cover piping joints with pipe cover.
• Insulate all piping on the outdoor unit side, including valves.
• Apply piping tape starting from the outdoor unit connection.
• Use additional insulation in high temperature/humidity areas to prevent condensation.

19. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

19-1. PURGING PROCEDURES AND LEAK TEST

• Follow steps to remove service port caps, connect gauge manifold, evacuate the system, and perform leak tests.
• Use a micron gauge for accurate vacuum measurement.
• Break vacuum with Nitrogen (N2) and perform rise tests.
• Fully open stop valves after purging.
• Charge additional refrigerant if necessary.

19-2. TEST RUN

• Power on the unit and initiate COOL or HEAT operation.
• The unit performs a 30-minute test run.
• Check for proper operation and wiring.
• Remote control signal reception and auto-restart function are explained.
• Instructions for setting the installation position via the remote controller are provided.
• Users should be informed about the unit's functions and maintenance.