Daikin Split R32 Series Installation Manual

4.1 Preparation of the Installation Location

• Outdoor Unit Installation Requirements: Maintain specified clearances for air intake and outlet, and for maintenance. Ensure adequate space for work under the ceiling and for maintenance of piping and electrical connections.
• Snowfall Protection: In areas with heavy snowfall, select an installation location where the unit will not be buried in snow. Install protection or a snow cover and support if necessary.
• Installation Environment: The outdoor unit is designed for outdoor installation only and for ambient temperatures within specified ranges for cooling and heating.

4.2 Mounting the Outdoor Unit

• Installation Structure: Use vibration-resistant rubber if vibrations may be transmitted to the building. The unit can be installed directly on a concrete veranda or other solid surface, provided adequate drainage is ensured. Prepare anchor bolts, nuts, and washers (M8 or M10).
• Drainage: In cold climates, take measures to prevent condensate from freezing. If drain holes are obstructed, place additional supports (≤30 mm) under the outdoor unit feet. Use a drain plug for drainage and a Ø16 flexible hose (not supplied).

5.1 Preparation of Refrigerant Piping

• Refrigerant Piping Requirements: Piping and joints must be permanent in occupied spaces, except for joints directly connecting to indoor units. Use seamless, deoxidized copper with phosphoric acid for refrigerant piping. Foreign material in pipes must be ≤30 mg/10 m.
• Refrigerant Piping Sizes: Refer to the table for liquid and gas pipe diameters for Class 40 and Class 50 units.
• Refrigerant Piping Insulation: Use polyethylene foam insulation with a thermal conductivity between 0.041 and 0.052 W/mK and a heat resistance of at least 120°C. Ensure sufficient insulation thickness (at least 20 mm) to prevent condensation in humid conditions. Use separate insulation for liquid and gas refrigerant pipes.
• Refrigerant Piping Length and Height Difference: Shorter piping leads to better system performance. Adhere to maximum piping length and height difference limits.

5.2 Connection of Refrigerant Piping

• Flare Connections: Use the supplied flare nuts. Apply refrigerant oil to the inside of the flare connection to prevent gas leaks. Do not reuse gaskets. Use appropriate tools to avoid damaging the flare nut.
• Connecting to Outdoor Unit: Connect the liquid refrigerant pipe of the indoor unit to the liquid shut-off valve of the outdoor unit. Connect the gas refrigerant pipe of the indoor unit to the gas shut-off valve of the outdoor unit. Protect piping from physical damage.
• Refrigerant Charging: Ensure refrigerant pipes are connected and leak-tested before operating the compressor. Failure to do so can cause abnormal pressure and damage.

5.3 Verification of Refrigerant Piping

• Leak Detection: Do not exceed the maximum service pressure. Use a bubble-testing solution recommended by your supplier. Avoid soapy water as it can cause cracks or corrosion. Pressurize the system with nitrogen to at least 200 kPa (2 bar) for leak detection.
• Vacuum Drying: Connect the vacuum pump to the service ports of the shut-off valves. Evacuate the system to -0.1 MPa (-1 bar). Check for pressure changes to ensure no moisture is present. Continue vacuum drying for at least 2 hours. Verify pressure again after stopping the pump. If the vacuum cannot be maintained, re-check for leaks or repeat the vacuum drying process.

6.1 About Refrigerant

• This product contains fluorinated greenhouse gases (R32). Do not release these gases into the atmosphere. The Global Warming Potential (GWP) of R32 is 675.
• Periodic leak detection inspections may be required by law.
• Warning: Refrigerant is slightly flammable. If it leaks and contacts a flame, it can cause fire or toxic gas formation. Turn off all fuel-burning appliances, ventilate the area, and contact the dealer. Do not use the unit until the leak is confirmed and repaired.
• Do not pierce or burn refrigerant cycle parts. Do not use defrosting aids other than those recommended by the manufacturer. Refrigerant is odorless.

6.2 Determination of Additional Refrigerant Amount

If the total liquid pipe length exceeds 20 m, additional refrigerant is required. Calculate the amount based on the excess length.

6.3 Determination of Complete Recharge Amount

If a complete recharge is necessary, the total refrigerant charge is the factory charge plus any additional amount determined.

6.4 Supplementary Refrigerant Charging

• Use only R32 refrigerant.
• Ensure the refrigerant pipe is connected and leak-tested before charging.
• Connect the refrigerant cylinder to the service port and charge the additional refrigerant. Open the gas shut-off valve.

6.5 Attaching the Fluorinated Greenhouse Gas Label

Fill out the label with the factory refrigerant charge, additional charge, total charge, and CO2 equivalent. Attach the label near the shut-off valves inside the outdoor unit.

6.6 Checking Refrigerant Piping Joints After Charging

• Perform a leak test with a minimum sensitivity of 5 g/year.
• If a leak is detected, recover the refrigerant, repair the joint, and repeat the test. Refer to Section 5.3.1 for leak detection procedures.
• Charge refrigerant and re-check for leaks.

7.1 Specifications of Standard Wiring Components

• Power Supply: 220-240 V, 50 Hz, 1 phase.
• Current: 2MXM40: 9.8 A, 2MXM50: 13.3 A.
• Power Cable: Must comply with national wiring regulations. Use 3-conductor cable with a minimum wire size of 2.5 mm².
• Interconnection Wiring: Use harmonized cables with double insulation suitable for the applicable voltage. Use 4-conductor cable with a minimum wire size of 1.5 mm².
• Circuit Breaker: 16 A recommended. Must comply with national wiring regulations.
• Residual Current Device / Residual Current Circuit Breaker: Must comply with national wiring regulations.

7.2 Wiring Connection to the Outdoor Unit

• Remove the electrical box cover.
• Connect the wires between the indoor and outdoor units, ensuring terminal numbers match. Verify that piping and wiring symbols correspond.
• Connect the correct wiring to the correct terminals (A to A, B to B).
• Ensure all terminal screws are tightened securely. Check that wires are not pulled out. Secure the wire support to prevent external stress on wire ends. Route the electrical wiring through the notch at the bottom of the protective plate. Ensure electrical wiring does not contact the gas piping.

8.1 Finalizing Outdoor Unit Installation

• Ensure the system is properly grounded.
• Turn off the power supply before maintenance.
• Install the electrical box cover before turning on the power.
• Isolate and install refrigerant piping and cables as shown in the diagrams. Install the maintenance cover.
• Reinstall the electrical box cover and top cover in reverse order and turn on the main power supply.

9.1 About ECONO Mode Prohibition Setting

This setting disables the user interface control signal. Use this parameter to block reception of input commands (cooling/heating) from indoor unit user interfaces.

• To activate ECONO mode prohibition: Ensure the main power is off. Remove the top cover and electrical box cover. Cut jumper J23. Reinstall the electrical box cover and service cover.

9.2 About Night Quiet Mode

The night quiet mode allows the outdoor unit to operate more quietly at night, reducing cooling capacity. Explain this mode to the customer.

• To activate night quiet mode: Ensure the main power is off. Remove the top cover and electrical box cover. Cut jumper J6. Reinstall the top cover and electrical box cover.

9.3 About Heating Mode Lock

Heating mode lock limits the unit's operation to heating mode.

• To activate heating mode lock: Remove the top cover (2 screws) and front panel (8 screws). Remove connector S99 to set heating mode lock. Reconnect the connector to reset to heat pump mode (cooling/heating).

9.4 About Standby Power Saving Function

The standby power saving function cuts off the outdoor unit's power supply and activates standby power saving mode on the indoor unit. This function works with specific indoor units. If another indoor unit is used, the connector for standby power saving must be connected.

• To activate standby power saving: Ensure the main power is off. Remove the maintenance cover. Disconnect the standby power saving connector. Connect the main power supply.

10.1 General Startup Checklist

• After unit installation, check the following:
• Unit is closed.
• Indoor unit is correctly mounted.
• Outdoor unit is correctly mounted.
• System is properly grounded, and earth terminals are tightened.
• Power supply voltage matches the unit's identification label.
• Electrical box contains no loose connections or damaged electrical components.
• No damaged components or pinched pipes inside indoor and outdoor units.
• No refrigerant leaks.
• Refrigerant pipes (gas and liquid) have thermal insulation.

10.2 Startup Checklist During Service

• Wiring check.
• Air purge.
• Operation test.

10.3 Operation Test

• Before starting the operation test, measure the primary voltage of the circuit breaker.
• Piping and wiring must correspond.
• Outdoor unit shut-off valves (gas and liquid) must be fully open.
• System initialization may take several minutes depending on the number of indoor units and options used.
• To perform an operation test:
• In cooling mode, select the lowest programmable temperature. In heating mode, select the highest programmable temperature.
• Measure the temperature at the inlet and outlet of the indoor unit after operating for approximately 20 minutes. The difference should be greater than 8°C (cooling) or 15°C (heating).
• Check the operation of each unit individually, then check the simultaneous operation of all indoor units. Verify heating and cooling operations.
• After the test, set the temperature to a normal level (Cooling: 26-28°C, Heating: 20-24°C).
• The test can be deactivated if necessary.
• Once the unit is turned off, it cannot be restarted for 3 minutes.
• Even when the unit is OFF, it consumes electricity.
• When power is restored after an outage, the previously selected mode resumes.