Mitsubishi Split System SUZ-AA18NLH-U1

Review the TEST POINT DIAGRAM AND VOLTAGE

Identify the JS wire on the outdoor inverter P.C. board

Determine the current state of the JS Jumper

Adjust the JS wire to change the defrost finish temperature

Verify the defrost finish temperature setting

Document any changes made to the JS wire

Select the function from the table

Adjust the defrost finish temperature using the remote controller

Confirm the new temperature setting on the remote controller

Complete the following safety checks before starting work on the refrigerating system

Check the area with an appropriate refrigerant detector before starting work

Monitor the area continuously with the refrigerant detector during work

Leak Detection Equipment Verification

Is the leak detection equipment suitable for all applicable refrigerants?

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

Ensure that 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

Charge the system with refrigerant

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

Ensure extreme care is taken not to overfill the refrigerating system

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

Ensure the compressor is energized when pre-heat control is ON.

Cut the JK wire of the inverter P.C. board to activate pre-heat control.

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

Inverter P.C. Board Replacement Check

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