Daikin R32 Split Series Air Conditioner Installation Manual

1 About the Documentation

1.1 Product code: 2MXM40A2, 2MXM50A2

1.2 About this document:

WARNING: Ensure installation, servicing, maintenance, repair, and applied materials follow Daikin instructions and comply with applicable legislation. In Europe and areas where IEC standards apply, EN/IEC 60335-2-40 is the applicable standard.

INFORMATION: Users should retain printed documentation for future reference.

Target audience: Authorised installers.

This appliance is intended for expert or trained users in shops, light industry, farms, or commercial and household use by lay persons.

This document covers installation instructions specific to the outdoor unit. For indoor unit installation, refer to the indoor unit's installation manual.

Documentation set: This document is part of a set including General safety precautions (paper, in outdoor unit box), Outdoor unit installation manual (paper, in outdoor unit box), and Installer reference guide (digital files on daikin.eu).

Find full documentation and product information on the Daikin website by scanning the provided QR codes (description: QR codes linking to Daikin website for documentation).

2 Specific Installer Safety Instructions

Always observe the following safety instructions and regulations.

Unit installation: Installation must comply with applicable legislation (EN378 in Europe).

Installation site: Check if the location supports the unit's weight. Ensure sufficient service space. Do NOT install the unit in contact with a ceiling or wall to prevent vibrations.

Storage: Store the appliance to prevent mechanical damage in a well-ventilated room without ignition sources.

Piping installation: Use permanent joints inside occupied spaces, except for direct connections to indoor units. No brazing or welding on site for units with R32 refrigerant. Site-made joints must be non-permanent. Do NOT connect branch piping to the outdoor unit without connecting the indoor unit first. Connect refrigerant piping securely before running the compressor to prevent air ingress.

Flare connections: Prevent refrigerant gas leakage by using new flares and included flare nuts. Do NOT open valves before flaring is complete.

Vacuum drying: Do NOT open stop valves before vacuum drying is finished.

Refrigerant charging: Refrigerant R32 is mildly flammable. Avoid contact with fire sources if leaks occur. Turn off heating devices and ventilate the room. Use only R32 refrigerant. Do NOT vent R32 into the atmosphere (GWP 675). Always use protective gloves and safety glasses when charging. Never touch accidental leaking refrigerant.

Electrical installation: All wiring must be done by an authorised electrician, complying with national regulations. Use multicore cable for power supply. Use an all-pole disconnection type breaker with at least 3 mm contact gap (overvoltage category III). Replace damaged supply cords only with manufacturer-approved parts. Do NOT connect power to the indoor unit. Do NOT use locally purchased electrical parts. Keep interconnection wiring away from hot copper pipes. Do NOT touch live electrical parts.

3 About the Box

3.1 Outdoor unit

3.1.1 To remove the accessories from the outdoor unit

Ensure you have the following accessories:

• a: Outdoor unit installation manual
• b: General safety precautions
• c: Fluorinated greenhouse gases label
• d: Multilingual fluorinated greenhouse gases label
• e: Drain socket
• f: Screw bag (for fixing wire retainer)
• g: Reducer assembly
• h: Energy label

4 Unit Installation

WARNING: Installation must be done by an installer, complying with applicable legislation (EN378 in Europe).

4.1 Preparing the installation site

WARNING: Store the appliance to prevent mechanical damage in a well-ventilated room without ignition sources.

4.1.1 Installation site requirements of the outdoor unit

Mind the following spacing guidelines:

• Wall facing 1 side: Minimum clearances: 50 mm (sides), 100 mm (top).
• Wall facing 2 sides: Minimum clearances: 50 mm (sides), 100 mm (top), 150 mm (front).
• Wall facing 3 sides: Minimum clearances: 150 mm (sides), 100 mm (top), 150 mm (front).

Allow 300 mm of work space below the ceiling surface and 250 mm for piping and electrical servicing.

4.1.2 Additional installation site requirements of the outdoor unit in cold climates

Protect the outdoor unit against direct snowfall and ensure it is never snowed up.

For heavy snowfall areas, provide at least 150 mm (300 mm for heavy snowfall) of free space below the unit and position it at least 100 mm above the maximum expected snow level. Consider a pedestal if necessary.

Ensure the heat exchanger coil is not affected by snow, especially with lateral snowfall. Install a snow cover or shed and a pedestal if needed.

Do NOT install the unit in sound-sensitive areas (e.g., near a bedroom) to avoid operational noise issues.

INFORMATION: The sound pressure level is less than 70 dBA.

The outdoor unit is designed for outdoor installation within ambient temperatures:

• 2MXM40: Cooling: -10~46°C DB, Heating: -15~24°C DB
• 2MXM50: Cooling: -10~50°C DB, Heating: -20~24°C DB

4.2 Mounting the outdoor unit

4.2.1 To provide the installation structure

Use vibration-proof rubber (field supply) if vibrations may be transmitted to the building.

The unit can be installed on a concrete veranda or solid surface providing proper drainage.

Prepare 4 sets of M8 or M10 anchor bolts, nuts, and washers (field supply).

4.2.2 To install the outdoor unit

Diagram shows mounting points and drain port. Ensure the unit is at least 100 mm above the expected snow level.

4.2.3 To provide drainage

NOTICE: In cold climates, take measures to prevent condensate from freezing.

NOTICE: If drain holes are blocked, place additional foot bases (30 mm) under the unit's feet.

Use a drain plug and a Ø16 mm hose (field supply) for drainage.

5 Piping Installation

5.1 Preparing refrigerant piping

5.1.1 Refrigerant piping requirements

CAUTION: Use permanent joints inside occupied spaces, except for direct connections to indoor units.

NOTICE: Use piping suitable for refrigerant. Phosphoric acid deoxidised seamless copper is recommended. Foreign materials inside pipes must be ≤30 mg/10 m.

Refrigerant piping diameter:

• Class 40: Liquid: 2x Ø6.4 mm (1/4"), Gas: 2x Ø9.5 mm (3/8")
• Class 50: Liquid: 2x Ø6.4 mm (1/4"), Gas: 1x Ø9.5 mm (3/8") or 1x Ø12.7 mm (1/2")

INFORMATION: Reducers may be required; refer to section 5.2.1.

Refrigerant piping material: Phosphoric acid deoxidised seamless copper. Use only annealed material for flare connections.

Piping temper grade and thickness:

(a) Thickness may need to be larger based on applicable legislation and maximum working pressure.

5.1.2 Refrigerant piping insulation

Use polyethylene foam insulation with a heat transfer rate of 0.041-0.052 W/mK and heat resistance of at least 120°C.

If temperature >30°C and humidity >80% RH, use insulation thickness of at least 20 mm to prevent condensation.

Use separate thermal insulation for gas and liquid refrigerant piping.

5.1.3 Refrigerant piping length and height difference

Shorter piping improves performance. Comply with these requirements:

• Shortest allowable length per room: 3 m.
• Refrigerant piping length to each indoor unit: ≤20 m.
• Refrigerant piping total length: ≤30 m.
• Height difference (outdoor-indoor): ≤15 m (unit higher), ≤7.5 m (unit lower).
• Height difference (indoor-indoor): ≤7.5 m (unit higher), ≤15 m (unit lower).

5.2 Connecting the refrigerant piping

DANGER: RISK OF BURNING/SCALDING

CAUTION: No brazing or welding on site for R32 units. Site-made joints must be non-permanent for connections within occupied spaces.

CAUTION: Do NOT connect branch piping without connecting the indoor unit.

5.2.1 Connections between outdoor and indoor unit using reducers

Total indoor unit capacity class:

• 2MXM40: ≤6.0 kW
• 2MXM50: ≤8.5 kW

INFORMATION: Connect at least 2 indoor units.

Reducer specifications:

(a) Only for FTXM42R, FTXM42A, FTXA42C.

Reducer type: Ø12.7 mm → Ø9.5 mm.

Connection examples: Diagram shows connecting a Ø9.5 mm pipe to a Ø12.7 mm gas port using reducers.

NOTICE: Apply refrigeration oil to both sides of reducer 1 to prevent gas leakage. Use R32 refrigeration oil (FW68DA).

Flare nut torque: Ø12.7 mm: 50-60 N·m. Use an appropriate wrench to avoid overtightening.

5.2.2 To connect the refrigerant piping to the outdoor unit

Keep field piping as short as possible.

6 Charging refrigerant

Protect field piping against physical damage.

WARNING: Connect piping securely before running the compressor. Failure to do so can cause abnormal pressure, equipment damage, or injury.

NOTICE: Use the unit's flare nut. Apply refrigeration oil only to the flare's inside. Do NOT reuse joints.

1. Connect the liquid refrigerant connection to the liquid stop valve.

2. Connect the gas refrigerant connection to the gas stop valve.

NOTICE: Install piping in a duct or wrap with finishing tape.

5.3 Checking the refrigerant piping

5.3.1 To check for leaks

NOTICE: Do NOT exceed the unit's maximum working pressure.

NOTICE: Use a recommended bubble test solution. NEVER use soap water, as it can cause cracking, absorb moisture, or lead to corrosion.

1. Charge the system with nitrogen gas to at least 200 kPa (2 bar), preferably higher (up to 30 bar) per local legislation.

2. Check all connections for leaks using the bubble test solution.

5.3.2 To perform vacuum drying

DANGER: RISK OF EXPLOSION: Do NOT open stop valves before vacuum drying is finished.

NOTICE: Connect the vacuum pump to the gas stop valve service ports.

1. Vacuum the system until the manifold pressure reaches -0.1 MPa (-1 bar).

2. Leave for 4-5 minutes and check pressure. If pressure does not change, the system is dry. If it increases, there is moisture; proceed to the next step.

3. Vacuum the system for at least 2 hours to -0.1 MPa (-1 bar).

4. After turning off the pump, check pressure for at least 1 hour.

5. If target vacuum is not reached or maintained, re-check for leaks and perform vacuum drying again.

NOTICE: Open stop valves only after piping installation and vacuum drying are complete to prevent compressor damage.

6.1 About the refrigerant

This product contains fluorinated greenhouse gases (R32, GWP 675). Do NOT vent gases into the atmosphere.

WARNING: MILDLY FLAMMABLE MATERIAL: R32 is mildly flammable. If it leaks and contacts fire, it may cause fire or harmful gas formation. Turn off heating devices and ventilate. Do NOT use the unit until repaired.

WARNING: Never touch accidental leaking refrigerant; it can cause frostbite.

NOTICE: Legislation requires refrigerant charge to be indicated by weight and CO2 equivalent. Formula: GWP × total charge [kg] / 1000.

6.2 To determine the additional refrigerant amount

Based on total liquid piping length:

• ≤20 m: Do NOT add additional refrigerant.
• >20 m: R = (total length (m) - 20 m) × 0.020 kg. Round to nearest 0.1 kg.

INFORMATION: Piping length is the one-way liquid piping length.

6.3 To determine the complete recharge amount

INFORMATION: Total refrigerant charge = factory charge + determined additional amount.

6.4 To charge additional refrigerant

Prerequisite: Piping connected and checked (leak test, vacuum drying).

1. Connect refrigerant cylinder to the service port.

2. Charge the additional refrigerant amount.

3. Open the gas stop valve.

6.5 To fix the fluorinated greenhouse gases label

Fill in the label with factory charge, additional charge, total charge, and CO2 equivalent. Apply the label inside the outdoor unit near the stop valves.

6.6 To check refrigerant piping joints for leaks after charging refrigerant

Perform a tightness test with a minimum sensitivity of 5 g/year, using a pressure of at least 0.25 times the maximum working pressure.

If a leak is detected: Recover refrigerant, repair the joint, repeat the test, charge refrigerant, and check for leaks again.

7 Electrical Installation

DANGER: RISK OF ELECTROCUTION

WARNING: All wiring must be performed by an authorised electrician, complying with national wiring regulations and applicable legislation.

WARNING: Always use multicore cable for power supply. Use an all-pole disconnection type breaker with at least 3 mm contact gap (overvoltage category III).

WARNING: If the supply cord is damaged, it must be replaced by the manufacturer, its service agent, or qualified persons.

WARNING: Do NOT connect power to the indoor unit. Do NOT use locally purchased electrical parts. Do NOT branch power for drain pumps. Keep interconnection wiring away from hot copper pipes. Do NOT touch live electrical parts.

7.1 Specifications of standard wiring components

Power supply: 220-240 V, 50 Hz, 1~.

Current: 2MXM40: 9.8 A, 2MXM50: 13.3 A.

Components:

• Power supply cable: 3-core cable, minimum 2.5 mm². Must comply with national wiring regulation.
• Interconnection cable: 4-core cable, minimum 1.5 mm². Use harmonised wire with double insulation.
• Recommended circuit breaker: 16 A.
• Earth leakage circuit breaker / residual current circuit breaker: Must comply with national wiring regulation.

7.2 To connect the electrical wiring to the outdoor unit

1. Remove the switch box cover.

2. Connect wires between indoor and outdoor units, matching terminal numbers and symbols.

3. Ensure correct wiring for each room (A to A, B to B).

4. Tighten terminal screws securely.

5. Check wire connections by lightly pulling.

6. Secure the wire retainer to avoid stress on terminations.

7. Pass wiring through the protection plate cutout.

8. Ensure electrical wiring does not contact gas piping.

9. Reattach the switch box cover and service cover.

8 Finishing the outdoor unit installation

8.1 To finish the outdoor unit installation

DANGER: RISK OF ELECTROCUTION: Ensure the system is earthed. Turn OFF power before servicing. Install switch box cover before turning ON power.

1. Insulate and fix refrigerant piping and cables as follows:

• Gas pipe
• Gas pipe insulation
• Interconnection cable
• Field wiring (if applicable)
• Liquid pipe
• Liquid pipe insulation
• Finishing tape

2. Install the service cover.

9 Configuration

9.1 About ECONO mode prohibition setting

This setting disables input control signals from the user interface, blocking cooling/heating reception from indoor units.

9.1.1 To turn ON ECONO mode prohibition setting

Prerequisite: Main power supply MUST be turned off.

1. Remove the top plate (2 screws) and electric box cover.

2. Cut jumper J23.

3. Reinstall covers and turn on the main power supply.

9.2 About night quiet mode

This function makes the outdoor unit run more quietly at night, reducing cooling capacity. Confirm with the customer if they want to use this mode.

9.2.1 To turn ON the night quiet mode

Prerequisite: Main power supply MUST be turned off.

1. Remove the top plate and electric box cover.

2. Cut jumper J6.

3. Reinstall covers. Be careful not to pinch the fan motor lead wire.

9.3 About heat mode lock

Heat mode lock limits the unit to heat operation.

9.3.1 To turn ON heat mode lock

1. Remove the top plate (2 screws) and front plate (8 screws).

2. To set heat mode lock, remove the S99 connector.

3. To reset, plug the connector back.

4. Reinstall the top and front plates.

INFORMATION: Forced operation is also available in heating mode.

9.4 About standby electricity saving function

This function turns OFF power to the outdoor unit and ON standby electricity saving mode on the indoor unit.

Works with units: 2MXM40, 2MXM50 with CTXA, CTXM, CVXM, FTXM, FTXP, FTXJ, FVXM.

If other indoor units are used, the standby electric saving connector MUST be plugged in.

9.4.1 To turn ON standby electricity saving function

Prerequisite: Main power supply MUST be turned OFF.

1. Remove the service cover.

2. Disconnect the selective standby electricity saving connector.

10 Commissioning

NOTICE: A general commissioning checklist is available on the Daikin Business Portal.

NOTICE: Always operate the unit with thermistors and/or pressure sensors/switches to prevent compressor burning.

10.1 Checklist before commissioning

After installation, check the following items:

• Indoor unit is properly mounted.
• Outdoor unit is properly mounted.
• System is properly earthed.
• Power supply voltage matches the identification label.
• No loose connections or damaged electrical components in the switch box.
• No damaged components or squeezed pipes.
• No refrigerant leaks.
• Refrigerant pipes are thermally insulated.
• Correct pipe size and insulation are used.
• Stop valves (gas and liquid) are fully open.
• Drainage flows smoothly.
• Indoor unit receives user interface signals.
• Specified wires are used for the interconnection cable.
• Fuses, circuit breakers, or protection devices are installed correctly and not bypassed.
• Wiring and piping marks match for each indoor unit.
• Priority room setting is for 2 or more rooms.

10.2 Checklist during commissioning

• Perform a wiring check.
• Perform an air purge.
• Perform a test run.

10.3 Trial operation and testing

Before test run, measure voltage at the safety breaker's primary side. Ensure piping and wiring match. Ensure stop valves are fully open.

Multi-system initialization may take several minutes.

10.3.1 To perform a test run

INFORMATION: For commissioning errors, consult the service manual.

Prerequisites: Power supply in specified range. Test run can be in cooling or heating mode, following the indoor unit's operation manual.

1. In cooling mode, set the lowest temperature. In heating mode, set the highest.

2. Measure the temperature difference at the indoor unit inlet/outlet after 20 minutes (should be >8°C cooling, >15°C heating).

3. Check individual and simultaneous operation of all units (heating and cooling).

4. After test run, set temperature to normal levels (Cooling: 26-28°C, Heating: 20-24°C).

INFORMATION: Test run can be disabled. Unit cannot be restarted for 3 minutes after being turned OFF.

INFORMATION: Frost may form on the gas stop valve during cooling operation (normal). The unit consumes electricity even when OFF. The previously selected mode resumes after a power break.

11 Maintenance and Service

NOTICE: A general maintenance/inspection checklist is available on the Daikin Business Portal.

NOTICE: Maintenance must be done by an authorised installer or service agent. Perform maintenance at least once a year, or more frequently if required by legislation.

NOTICE: Legislation requires refrigerant charge indication by weight and CO2 equivalent.

DANGER: RISK OF ELECTROCUTION: Disconnect power for >10 minutes before servicing. Measure voltage at main circuit capacitors/components. Voltage must be <50 V DC before touching components. Refer to wiring diagram for terminal locations.

Diagram shows electrical components and their connections (e.g., diode bridge, thermistors, expansion valve coils, fan motor, etc.).

12 Disposal

NOTICE: Do NOT dismantle the system yourself. Refrigerant, oil, and parts treatment must comply with applicable legislation. Units must be treated at a specialised facility for reuse, recycling, and recovery.

13 Technical Data

INFORMATION: To protect the environment, perform an automatic pump down operation when relocating or dismantling the unit. Refer to the service manual for pump down procedures.

Technical data is available on the Daikin website and Daikin Business Portal.

13.1 Wiring diagram

The wiring diagram is located inside the outdoor unit (bottom side of the top plate).

13.1.1 Unified wiring diagram legend

A comprehensive legend of symbols and their meanings is provided, covering components like circuit breakers, connectors, earth points, various electronic components (diodes, transistors, sensors, motors), and wiring types.

Color codes: BLK, BLU, BRN, GRN, GRY, SKY BLU, ORG, PNK, PRP/PPL, RED, WHT, YLW.

Component meanings: A*P (Printed circuit board), BS* (Pushbutton), BZ (Buzzer), C* (Capacitor), AC*/CN* etc. (Connection/connector), D*/V*D (Diode), DB* (Diode bridge), DS* (DIP switch), E*H (Heater), FU*/F*U (Fuse), FG* (Connector), H* (Harness), H*P/LED*/V*L (Pilot lamp/LED), HAP (Light emitting diode), HIGH VOLTAGE, IES (Intelligent eye sensor), IPM* (Intelligent power module), K*R etc. (Magnetic relay), L (Live), L* (Coil), L*R (Reactor), M* (Stepper motor), M*C (Compressor motor), M*F (Fan motor), M*P (Drain pump motor), M*S (Swing motor), MR* etc. (Magnetic relay), N (Neutral), n=* (Number of passes), PAM, PCB* (Printed circuit board), PM* (Power module), PS (Switching power supply), PTC* (PTC thermistor), Q* (IGBT), Q*C (Circuit breaker), Q*DI/KLM (Earth leak circuit breaker), Q*L (Overload protector), Q*M (Thermo switch), Q*R (Residual current device), R* (Resistor), R*T (Thermistor), RC (Receiver), S*C (Limit switch), S*L (Float switch), S*NG (Refrigerant leak detector), S*NPH/S*NPL (Pressure sensor), S*PH/HPS* (Pressure switch), S*T (Thermostat), S*RH (Humidity sensor), S*W/SW* (Operation switch), SA*/F1S (Surge arrester), SR*/WLU (Signal receiver), SS* (Selector switch), SHEET METAL (Terminal strip fixed plate), T*R (Transformer), TC/TRC (Transmitter), V*/R*V (Varistor), V*R (Diode bridge), WRC (Wireless remote controller), X* (Terminal), X*M (Terminal strip), Y*E (Electronic expansion valve coil), Y*R/Y*S (Reversing solenoid valve coil), Z*C (Ferrite core), ZF/Z*F (Noise filter).

13.2 Piping diagram: Outdoor unit

Component PED category classification: High pressure switches: category IV, Compressor: category II.

Diagram illustrates the outdoor unit's piping and component layout, including refrigerant flow for cooling and heating.