Mitsubishi Split System SUZ-AA18NL-U1

Is the outside temperature 68°F (20°C) or below?

Activate pre-heat control by cutting the JK wire of the inverter P.C. board

Refer to '11-6. TEST POINT DIAGRAM AND VOLTAGE' for guidance

Inverter P.C. Board Replacement

Check the Jumper wires on the inverter P.C. board

Cut/solder Jumper wires if necessary

Ensure that contamination of different refrigerants does not occur when using charging equipment

Ensure hoses or lines are as short as possible to minimize the amount of refrigerant contained in them

Keep cylinders in an appropriate position according to the instructions

Ensure that the refrigerating system is earthed prior to charging the system with refrigerant

Label the system when charging is complete (if not already)

Take extreme care not to overfill the refrigerating system

Select function from table 1 using the remote controller

Adjust the defrost finish temperature setting

Confirm the new temperature setting on the remote controller

Ensure all safety equipment is in place and operational

Verify that the refrigerant detector is appropriate for flammable refrigerants

Check that the leak detection equipment is nonsparking and adequately sealed

Refrigerating System Repair Preparation

Complete steps 1-2 to 1-6 before conducting work on the system

Check the area with a refrigerant detector for toxic or flammable atmospheres before work

Monitor the area with a refrigerant detector during work

Electrical Components Specification Check

Follow Manufacturer's Guidelines

Consult Manufacturer's Technical Department

Ventilation Machinery and Outlets