FUJITSU Multi Split Condenser Power Board User Manual

1. Product Overview

This document provides essential information for the FUJITSU Multi Split Condenser Power Board, model PL136. This power board is a critical component for the proper functioning of compatible FUJITSU Multi Split Inverter Condenser Units, specifically the 18000-24000 BTUs models AOBA18LAT3, AOBA24LAT3, AOBG18LAT3, and AOBG24LAT3. It is designed to regulate power distribution and control various functions within the outdoor unit.

Before proceeding with installation or any service, ensure that this power board (PL136, part number 9709893043) is the correct and compatible replacement part for your specific air conditioning unit model. Refer to the label on your outdoor unit for model verification.

Image 1.1: FUJITSU Multi Split Condenser Power Board PL136. This image displays the main circuit board with various components, connectors, and heat sinks, indicating its function as a power control unit.

2. Safety Information

Read and understand all safety instructions before attempting installation, maintenance, or troubleshooting. Failure to follow these instructions may result in electric shock, fire, property damage, or personal injury.

• Professional Installation Required: Installation and service of this power board must be performed by a qualified and certified HVAC technician. Attempting to install or repair this component without proper training and tools can be dangerous.
• Disconnect Power: Always disconnect all power to the outdoor unit at the main circuit breaker before opening the unit or performing any service. Verify that power is off using a voltage tester.
• Capacitor Discharge: Capacitors within the unit may retain a high voltage charge even after power is disconnected. Allow sufficient time for capacitors to discharge or safely discharge them according to industry standards.
• Electrical Hazards: This board operates with high voltage. Avoid contact with live electrical components.
• Proper Grounding: Ensure the unit is properly grounded according to local electrical codes.
• Use Original Parts: Only use genuine FUJITSU replacement parts to ensure compatibility and safe operation.

3. Setup and Installation

The following steps outline a general procedure for replacing the condenser power board. This is a complex procedure that requires specialized knowledge and tools. It is strongly recommended that this task be performed by a certified HVAC technician.

1. Preparation:
   • Ensure the replacement board (PL136) is correct for your unit model.
   • Gather necessary tools: screwdrivers, pliers, multimeter, insulated gloves, safety glasses.
2. Disconnect Power: Turn off the main power supply to the outdoor unit at the circuit breaker. Confirm zero voltage with a multimeter.
3. Access the Control Panel: Open the outdoor unit's access panel to expose the control board area.
4. Document Connections: Before disconnecting any wires, take clear photographs or make detailed diagrams of all wire connections to the existing board. Note the position and color of each wire.
5. Disconnect Wires: Carefully disconnect all wires and connectors from the old power board. Be gentle to avoid damaging connectors or wires.
6. Remove Old Board: Unscrew or unclip the old power board from its mounting points.
7. Install New Board: Position the new PL136 power board in the same location and secure it with screws or clips.
8. Reconnect Wires: Using your photographs or diagrams, carefully reconnect all wires and connectors to the new board. Ensure all connections are secure and correctly seated. Double-check every connection.
9. Close Panel: Securely close the outdoor unit's access panel.
10. Restore Power: Turn on the main power supply to the outdoor unit at the circuit breaker.
11. Test Operation: Initiate a test run of the air conditioning system to verify proper functionality. Monitor for any error codes or unusual behavior.

4. Operating Instructions

The PL136 power board is an internal component of the FUJITSU Multi Split Inverter Condenser Unit. It does not have direct user-operable controls. The operation of the air conditioning system is managed through the indoor unit's remote control or wall thermostat.

Once the power board is correctly installed and the system is powered on, it will function automatically as part of the overall air conditioning system. Refer to the user manual provided with your specific FUJITSU indoor and outdoor air conditioning units for detailed operating instructions, including setting temperatures, modes, and fan speeds.

5. Maintenance

The FUJITSU Multi Split Condenser Power Board PL136 is designed for long-term reliability and typically requires no routine user maintenance. However, general maintenance of the outdoor unit can contribute to the longevity of all its components, including the power board.

• Professional Inspection: It is recommended to have your air conditioning system, including the outdoor unit's internal components, inspected annually by a qualified HVAC technician. They can check for signs of wear, loose connections, or dust accumulation that might affect the power board.
• Keep Unit Clean: Ensure the outdoor unit's exterior and condenser coils are kept clean and free from debris, leaves, and dirt. A clean unit operates more efficiently and reduces strain on internal components.
• No User-Serviceable Parts: The power board itself contains no user-serviceable parts. Do not attempt to clean or repair the board directly.

6. Troubleshooting

If your FUJITSU Multi Split Inverter Condenser Unit is experiencing issues after a power board replacement, or if you suspect the power board is faulty, consider the following general troubleshooting steps. Due to the complexity and electrical hazards involved, all advanced troubleshooting and repairs should be performed by a qualified HVAC technician.

• No Power to Unit:
  • Check the main circuit breaker for the outdoor unit.
  • Verify all power connections to the power board are secure.
• Unit Not Operating Correctly:
  • Ensure all wire connections to the power board are correctly installed according to the diagrams taken during removal.
  • Check for any visible signs of damage on the board (e.g., burnt components, swollen capacitors).
• Error Codes Displayed:
  • Refer to your main FUJITSU air conditioner unit's service manual for a list of error codes and their meanings. Some codes may indicate a fault with the power board or related components.
• Unusual Noises or Smells:
  • Immediately disconnect power to the unit and contact a qualified technician.

If basic checks do not resolve the issue, or if you are unsure, contact a professional HVAC technician for diagnosis and repair.

7. Specifications

8. Warranty and Support

This FUJITSU Multi Split Condenser Power Board (PL136) comes with a 90-day warranty from the date of purchase. This warranty covers manufacturing defects under normal use conditions.

The warranty does not cover damage resulting from improper installation, misuse, accidents, unauthorized repairs, or acts of nature. Any attempt to repair or modify the board by unauthorized personnel will void the warranty.

For warranty claims, technical support, or to locate an authorized service center, please contact your original point of purchase or FUJITSU customer service directly. Provide your product model (PL136), part number (9709893043), and proof of purchase when seeking support.