Mitsubishi Electric Split-Type Air-Conditioner Installation Manual
This manual provides essential information for the installation of Mitsubishi Electric split-type air conditioners, specifically models MXZ-3C24NA3, MXZ-3C30NA3, and MXZ-4C36NA3. It covers safety precautions, required tools, installation procedures, wiring, and specifications.
Safety Precautions
WARNING: Installation should only be performed by qualified installers. Improper installation can lead to fire, electric shock, unit falling, or water leakage. Always use appropriate protective equipment and tools. Ensure the installation location can support the unit's weight and that electrical work is done on an exclusive circuit. Do not damage wires and always cut off the main power before electrical work. Use specified parts and ensure secure connections to prevent fire hazards. Avoid installing in areas with flammable gas leaks, as this could cause an explosion. Do not use intermediate or extension cords, and avoid connecting multiple devices to one outlet. Ensure power supply plugs and outlets are free of dust and securely connected. If the outdoor unit's air inlet/outlet side may be exposed to wind, install it with the air inlet facing the wall or use a baffle board. Avoid locations with flammable gas, machine oil, salty air, sulfide gas, high-frequency equipment, or high VOC emissions.
CAUTION: Perform drainage and piping work securely. Do not touch air inlets or aluminum fins. Do not install the outdoor unit where small animals may live, as they could cause malfunctions.
Specifications
| Model | Rated Voltage Frequency | Max. pipe length per indoor unit / for multi-system | Max. height difference | Max. no. of bends per indoor unit / for multi-system | Refrigerant adjustment A *7 |
|---|---|---|---|---|---|
| MXZ-3C24NA3 MXZ-3C30NA3 | 208/230 V 60 Hz | 82 ft. (25 m) / 230 ft. (70 m) | 49 ft. (15 m) | 25/70 | 1.08 oz each 5 ft. (20 g/m) |
| MXZ-4C36NA3 |
*Notes on pipe specifications and refrigerant charging are provided in the original manual.
Installation Location and Space Requirements
Select an installation location that is not exposed to strong wind, has good airflow, is protected from rain and direct sunlight, and is away from sources of noise or vibration. Ensure the location is free from combustible gas leaks and has a rigid support. Install the unit horizontally and at least 3 ft. (1 m) away from TV or radio antennas. If installing in areas with heavy snow, consider a canopy or pedestal. Maintain adequate free space around the outdoor unit for proper airflow and maintenance, as detailed in the diagrams provided.
Installation Diagram and Parts
The installation diagram illustrates the placement of the outdoor unit and the necessary clearances. A list of components to be provided on-site is included, such as power supply cords, connecting wires, piping tape, and insulation materials.
Installation Procedures
- Unit Installation: Securely fix the unit's legs with bolts. Ensure the unit is stable to prevent falling during earthquakes or strong winds. Refer to foundation guidelines. Avoid using drain sockets and caps in cold regions where freezing may occur.
- Wiring: Use dedicated circuits for the air conditioner and follow applicable technical standards. Connect wires according to the diagram, ensuring screws are tightened securely. Connect ground wires, indoor/outdoor unit connecting wires, and the power supply cord. Ensure all connections are firm and no external force is applied to the terminal blocks.
- Flaring Work and Pipe Connection: Cut and deburr copper pipes correctly. Apply flare nuts before flaring. Ensure proper flaring dimensions and check against the provided figures. Connect pipes securely, aligning the centers and tightening flare nuts with the specified torque. Use refrigeration oil on flared ends and connections.
- Insulation and Taping: Cover piping joints with pipe covers and insulate all piping, including valves, on the outdoor unit side. Apply piping tape starting from the outdoor unit entry. Add extra insulation if the piping passes through areas with high temperature and humidity.
- Purging Procedures, Leak Test, and Test Run: Remove the service port cap, connect the gauge manifold valve and vacuum pump. Evacuate the system for at least 15 minutes. Check for vacuum and ensure no leaks. Open all stop valves fully. Charge the specified amount of refrigerant if necessary, slowly with liquid refrigerant. Perform leak tests and then a test run of each indoor unit individually.
- Gas Charge: Connect the gas cylinder to the service port and purge air from the piping. Replenish the specified amount of refrigerant while the air conditioner is operating in cooling mode.
- Operation Mode Locking: This feature allows locking the operation mode to COOL/DRY or HEAT. Refer to the manual for instructions on setting the switches.
- Noise Reduction: A function is available to lower the operating noise of the outdoor unit, for example, during nighttime cooling. Note that this may reduce cooling and heating capacity.
- Wiring/Piping Correction Function: This function helps detect and correct incorrect wiring and piping combinations. Follow the procedure to activate and check the results indicated by LEDs.
- Explanation to the User: Explain the operation and maintenance of the air conditioner to the user using the OPERATING INSTRUCTIONS.
- Pumping Down: For relocation or disposal, pump down the system to prevent refrigerant release. Follow the procedure to safely remove refrigerant.
Troubleshooting and Maintenance
The manual includes troubleshooting tips, such as checking LED indications for wiring/piping correction results and precautions for handling refrigerant.
