Split-Type Air-Conditioner Installation Manual

1. BEFORE INSTALLATION

1-1. SAFETY PRECAUTIONS

WARNING: Failure to follow these instructions can lead to death or serious injury.

• Do not install the unit yourself. Consult a qualified installer.
• Follow all instructions in the installation manual.
• Use appropriate protective equipment and tools during installation.
• Install the unit securely in a place that can bear its weight.
• Perform electrical work according to the manual and use an exclusive circuit.
• Ground the unit correctly. Do not connect to gas pipes, water pipes, lightning rods, or telephone grounds.
• Do not damage wires.
• Shut off the main power before working on the P.C. board or wiring.
• Use specified wires and connect them securely to avoid stress on the terminal block.
• Do not install where flammable gas may leak.
• Do not use intermediate connections or extension cords. Do not connect multiple devices to one outlet.
• Use only provided or specified parts.
• Ensure the power supply plug and outlet are clean and the plug is fully inserted.
• Securely attach the electrical cover and service panel.
• Ensure only specified refrigerant (R410A) enters the refrigerant circuit.
• Do not discharge refrigerant into the atmosphere. Check for leaks after installation and ventilate if necessary.
• Use appropriate tools and piping materials for R410A.
• 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.
• Install according to national wiring regulations and use a Ground Fault Interrupt (GFI) circuit breaker.
• Be cautious when opening/closing valves below freezing temperatures as refrigerant may spurt out.

CAUTION: Incorrect operation may lead to serious injury.

• Perform drainage and piping work securely.
• Do not touch the air inlet or aluminum fins of the outdoor unit.
• Do not install where small animals may live.
• Ensure unused ports are securely tightened.
• When charging refrigerant, use liquid refrigerant and charge slowly. Warm gas cylinders with warm water (under 104°F/40°C) in cold seasons, but never use naked fire or steam.

1-2. SPECIFICATIONS

*1 Never use pipes with thickness less than specified. *2 Use copper or copper-alloy seamless pipe. *3 Be careful not to crush or bend pipe. *4 Bending radius must be 4 in. (100 mm) or more. *5 Insulation material: Heat resisting foam plastic 0.045 specific gravity. *6 Use specified insulation thickness. *7 If pipe length exceeds 98 ft (30 m), additional refrigerant is required. *8 Piping spec table does not provide minimum line set length. Piping less than 10 ft (3m) could produce intermittent noise. *9 When connecting two PAA-A18 units, total piping length must be 33 ft (10 m) or more and change gas pipe diameter to ø5/8 inch (15.88 mm).

1-3. SELECTING OPTIONAL DIFFERENT-DIAMETER JOINTS

If pipe diameter does not match outdoor unit port size, use optional joints as per table. (Unit: inch (mm))

1-4. SELECTING THE INSTALLATION LOCATION

• Avoid places exposed to strong wind.
• Ensure good airflow and a dustless environment.
• Minimize exposure to rain or direct sunlight.
• Choose a location that does not annoy neighbors with operation sound or air.
• Install on a rigid wall or support to prevent vibration.
• Ensure no risk of combustible gas leakage.
• Secure the unit legs.
• Maintain at least 10 ft. (3 m) distance from TV/radio antennas.
• Install the unit horizontally.
• Avoid areas affected by snowfall or blowing snow. Use a canopy, pedestal, or baffle boards in heavy snow areas.

Note: Make a piping loop near the outdoor unit to reduce vibration transmission.

Note on low outdoor temperature operation:

• Never install the outdoor unit where its air inlet/outlet side may be exposed directly to wind.
• Install with the air inlet side facing the wall to prevent wind exposure.
• Consider installing a baffle board on the air outlet side.

Avoid the following locations:

• Where flammable gas could leak.
• Where there is much machine oil.
• Salty places (seaside).
• Places with sulfide gas (hot springs, sewage).
• Areas with high-frequency or wireless equipment.
• Areas with high levels of VOCs (phthalate compounds, formaldehyde, etc.).

FREE SPACE REQUIRED AROUND OUTDOOR UNIT

Diagrams illustrating required clearances for obstacles above, in front, and on the sides of the outdoor unit are provided. Ensure adequate space for airflow and service access.

• 1. Obstacles above: Specifies clearance when there is an obstacle above the unit.
• 2. Front (blowing) side open: Shows clearance when the front is open and obstacles are behind/on sides.
• 3. Obstacles in front (blowing) only: Details clearance when there is an obstacle in front.
• 4. Obstacles in front and behind: Describes conditions for using an optional outdoor blowing guide.
• 5. Obstacles in front, behind and on side(s): Details clearances for enclosed areas like verandahs and warns against installing units directly in front of or behind each other.
• 6. Service space: Indicates required space for maintenance.

2. OUTDOOR UNIT INSTALLATION

2-1. INSTALLING THE UNIT

• Fix the unit's legs securely with bolts.
• Ensure the unit is installed firmly to prevent falling.
• Refer to the foundation diagram for concrete foundations.
• For MXZ-2C20NAHZ4 and MXZ-3C24/30NAHZ4, do not use the drain socket and caps.
• For MXZ-5C42NA4 in cold regions, do not use the drain socket and caps to prevent drain freezing.

Diagrams show the outdoor unit installation base, including dimensions for anchor bolts and spacing.

2-2. CONNECTING WIRES FOR OUTDOOR UNIT

• Use dedicated circuits for the air conditioner.
• Follow applicable technical standards for wiring.
• Connect wires according to the diagram.
• Tighten screws securely.
• Steps include removing the service panel, conduit plate, attaching conduit connectors, connecting ground wires, connecting indoor/outdoor unit connecting wires (A, B, C, D, E) to the terminal block, connecting the power supply cord (A), and securely closing the service panel.
• Observe the correct connection order (A $ ightarrow$ B $ ightarrow$ P for MXZ-2C; A $ ightarrow$ B $ ightarrow$ C $ ightarrow$ P for MXZ-3C; A $ ightarrow$ B $ ightarrow$ C $ ightarrow$ D $ ightarrow$ E $ ightarrow$ P for MXZ-5C).
• A disconnect switch is recommended. Use a ring tongue terminal for ground wire connection.

ELECTRICAL SPECIFICATIONS

Note: Removing the handle improves wiring operation. Reinstall the handle afterwards.

Wiring/Ground Wire Connection:

• Use solid conductor Min. AWG14 or stranded conductor Min. AWG14.
• Use double insulated copper wire with 600 V insulation.
• Use copper conductors only. Follow local electrical code.

Power Supply Cable: Use solid or stranded conductor Min. AWG8. Use copper conductors only. Follow local electrical code.

Ground Wire: Use solid or stranded conductor Min. AWG8. Use copper conductors only. Follow local electrical code.

WARNING: Use specified wires securely. Improper connection can cause fire. Provide extra length for servicing.

Cold Weather Operation: Turn on main power when ambient temperature is -4°F (-20°C) or higher. At -4°F (-20°C), allow at least 4 hours standby for electrical parts warming.

3. FLARING WORK AND PIPE CONNECTION

3-1. PRECAUTIONS FOR R410A REFRIGERANT

• Use C1220 copper phosphorus seamless pipes.
• Use pipes with specified thicknesses. Ensure pipes are clean.
• Perform no-oxidation brazing to prevent compressor damage.

WARNING: Ensure only R410A refrigerant enters the circuit. Foreign substances like air can cause abnormal pressure rise, explosion, or injury. Using other refrigerants can cause mechanical failure.

WARNING: Ensure adequate ventilation and fire prevention measures.

3-2. FLARING WORK

1. Cut copper pipe correctly.
2. Remove all burrs from the cut section, directing the pipe downward.
3. Remove flare nuts from units and place them on the pipe before flaring.
4. Perform flaring work, holding the pipe firmly at the specified dimension.
5. Compare the flared work with the provided figure. Re-do if defective.

Torque values for tightening flare nuts are provided in a table.

3-3. PIPE CONNECTION

Pipe sizes vary by indoor unit capacity and series (M, S, P). Refer to the table for liquid and gas pipe sizes.

• *1 Use optional different-diameter joints if needed.
• *2 Refer to P series manual for MVZ-A and SVZ-KP.
• *3 For PAA-A18, change gas pipe diameter to ø5/8 inch (15.88 mm).

WARNING: Connect refrigerant pipes securely before starting the compressor.

CAUTION: Do not apply refrigeration oil on screw threads. Tighten flare nuts with a torque wrench as specified. Over-tightening can damage the flare nut and cause leaks. Wrap insulation around piping.

3-4. INSULATION AND TAPING

1. Cover piping joints with pipe covers.
2. Insulate all piping, including valves, on the outdoor unit side.
3. Apply piping tape starting from the outdoor unit entry.
4. Use additional insulation in high temperature/humidity areas to prevent condensation.

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

4-1. PURGING PROCEDURES AND LEAK TEST

1. Remove service port cap.
2. Connect gauge manifold valve and vacuum pump to the service port.
3. Run vacuum pump for at least 15 minutes.
4. Check vacuum, close valve, and stop pump.
5. Leave for 1-2 minutes to check for pressure drop. Ensure gauge shows -14.7 psi [Gauge] (-0.101 MPa).
6. Quickly remove gauge manifold valve.
7. Fully open stop valves on gas and liquid pipes using a hexagonal wrench. Do not overtighten.
8. Charge refrigerant if needed, following section 1-2. Charge slowly with liquid refrigerant.
9. Tighten service port cap.
10. Perform leak test.

WARNING: Be cautious of refrigerant spurting when opening/closing valves below freezing temperatures.

4-2. GAS CHARGE

1. Connect gas cylinder to the service port.
2. Purge air from the pipe/hose.
3. Replenish specified refrigerant amount while operating in cooling mode.

Note: Comply with the specified quantity for the refrigerating cycle when adding refrigerant.

CAUTION: Use liquid refrigerant for charging. Charging gas refrigerant may alter composition. Charge slowly to avoid compressor lock. Warm gas cylinders if necessary, but never use naked fire or steam.

4-3. TEST RUN

• Check that the outdoor unit is not faulty (LED indicators).
• Ensure both gas and liquid stop valves are fully open.
• Perform test runs for indoor units individually to detect errors.

Restart Protective Mechanism: The compressor has a 3-minute restart delay to protect the unit.

Wiring/Piping Correction Function: This function detects and corrects wiring/piping combinations. Ensure power is supplied and stop valves are open. Press SW871 for 1 minute after power-on. Correction takes 10-20 minutes. Results are indicated by LEDs. Follow table for interpretation. Cancel by pressing SW871 again. Perform static elimination before use. Function does not operate below 32°F (0°C).

LED Indication during detection: LED1 (Red) Lit, LED2 (Yellow) Lit, LED3 (Green) Lit once.

Result of Piping/Wiring Correction:

• Completed (Problem corrected or normal): LED1 Lit, LED2 Not lit, LED3 Lit.
• Not completed (Detection failed): LED1 Once, LED2 Once, LED3 Once.
• Other indications: Refer to label behind service panel.

4-4. EXPLANATION TO THE USER

Explain the operating instructions, filter removal, remote controller usage, cleaning, and precautions to the user. Recommend reading the OPERATING INSTRUCTIONS carefully.

5. PUMPING DOWN

To relocate or dispose of the air conditioner, pump down the system to prevent refrigerant release:

1. Turn off the breaker.
2. Connect gauge manifold valve to the service port of the outdoor unit gas pipe stop valve.
3. Fully close the liquid pipe stop valve.
4. Turn on the breaker.
5. Start emergency COOL operation on all indoor units.
6. When pressure gauge shows 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the gas pipe stop valve and stop operation.
7. If pressure does not drop or protection function operates, collect all refrigerant and recharge after relocation.
8. Turn off the breaker. Remove gauge and piping.

WARNING: Do not execute pump down with the compressor if the refrigeration circuit has a leak. Stop the compressor before disconnecting pipes to prevent explosion.