Panasonic Air Conditioner Installation and Service Manual

Handling R32 Refrigerant

• R32 is a flammable refrigerant. Take extra precautions to minimize the risk of ignition.
• Before working on systems with flammable refrigerants, perform safety checks to minimize ignition risks.
• Use appropriate leak detection equipment suitable for R32.
• Have fire extinguishing equipment readily available if hot work is to be conducted.
• Ensure no ignition sources are present in the work area.
• Ventilate the area adequately before breaking into the system or performing hot work.
• When removing refrigerant, follow proper recovery procedures to prevent release into the atmosphere.
• Do not overfill recovery cylinders.
• Label recovered refrigerant cylinders correctly.
• When decommissioning, ensure the unit is labeled as emptied of refrigerant.

Installation Space Requirements

The installation space must comply with specific requirements based on the refrigerant charge amount to prevent hazardous concentrations in case of a leak. Refer to the "Check of Density Limit" section for detailed information on minimum floor area and ventilation requirements.

Installation Location Selection

Choose a location that is:

• Well-ventilated and sheltered from rain and direct sunlight.
• Free from flammable or corrosive gas leaks.
• Able to support the unit's weight and vibrations.
• Not obstructing air intake or discharge.
• Located away from areas where noise may be a nuisance to neighbors.
• Accessible for installation and service.
• At least 1 meter away from televisions and radios to avoid interference.

Special considerations are needed for locations prone to snowfall, strong winds, or exposure to petroleum products, saline content, or sulphurous gas.

Accessories Supplied

Each outdoor unit comes with accessories such as protective bushings and banding straps. Verify all accessory parts are present before installation.

Transport and Installation of Outdoor Unit

• Transport the unit in its original packaging.
• Use appropriate lifting equipment and padding to avoid damage.
• Secure the unit to a concrete or solid surface using appropriate bolts.
• Ensure the unit is installed upright on a horizontal plane.
• Avoid installing on a slanted roof.
• Use seismic isolating mounts or vibration absorbing rubber if the installation area is prone to oscillations or vibrations.
• Ensure proper drainage for condensate water, especially in cold regions where freezing may occur.

Refrigerant Installation

• Use clean pipes free from dust.
• Use pipe cutters and flaring tools specifically designed for R32.
• Coat the flare section with ether-based oil when using flaring tools.
• Use flare nuts supplied with the unit.
• The minimum allowable pipe length is 5 meters.
• Handle liquid refrigerant carefully to avoid frostbite.
• Do not release refrigerants during piping work.

Leak Test and Evacuation

• Use nitrogen gas for leak tightness testing. Never use flammable gas.
• Pressurize gradually to specified levels (0.5MPa, 1.5MPa, 4.15MPa) and check for pressure drops.
• Use a vacuum pump to achieve a pressure below -101kPa (5 Torr) to remove air and moisture.
• Ensure the 3-way valve is fully closed during leak testing and evacuation.

Refrigerant Filling

• Ensure the 3-way valve is open only after completing piping installation, leak test, and vacuuming.
• Fill only with liquid refrigerant.
• The unit is factory-charged with refrigerant for a specific pipe length. Calculate and add refrigerant if the installed pipe length exceeds the factory charge limit.
• Refer to the unit's nameplate for the amount of included refrigerant.

Electrical Wiring

• Ensure power supply voltage matches the unit's rating.
• Use specified cables and ensure secure connections.
• Install a circuit breaker and earth leakage current breaker.
• Ensure proper grounding of the equipment.
• Use shielded cables for control wiring and ensure proper termination.
• Protect electrical cables with provided bushings.
• Do not install phase advance capacitors.

Test Run

• Ensure all installation steps are completed before starting the test run.
• Check wiring, refrigerant piping, and insulation.
• Turn on the power supply to both indoor and outdoor units.
• Short-circuit the CHK pin on the outdoor unit control PCB.
• Short-circuit the RUN pin to start the test run (default is cooling mode).
• Adjust the MODE pin for heating operation if necessary.
• Ensure the test run is conducted for at least 20 minutes for cooling operation.
• Remove the CHK and MODE pins to stop the test run.

Checks After Installation

Perform the following checks after installation:

• Verify no short circuit with air intake.
• Check insulation security for refrigerant piping.
• Confirm correct wiring and that terminal screws are tight.
• Ensure smooth drain water flow.
• Verify proper installation of insulation material.
• Check secure connection of the earth wire.
• Ensure indoor and outdoor units are firmly fixed and there are no refrigerant leaks.

Delivery to Customer

Explain the operating instructions to the customer and recommend regular maintenance checks.

Model Information

This manual applies to Panasonic air conditioner models including:

• U-100PZ2E5, U-100PZ2E8
• U-125PZ2E5, U-125PZ2E8
• U-140PZ2E5, U-140PZ2E8

Twin Type Connections

Information on twin type connections, including applicable combinations, pipe diameters, equivalent pipe lengths, and refrigerant charging, is provided.

Pump Down Operation

Detailed instructions are provided for performing pump-down (refrigerant recovery) for moving units or servicing the refrigerant circuit. This includes stopping operation, connecting a pressure gauge, short-circuiting the PUMPDOWN pin, closing the liquid wiring valve, and completing the process.