Mitsubishi Split System SUZ-AA30NL-U1

Ensure capacitors are discharged safely to avoid sparking

Check for exposed live electrical components and wiring during system operations

Verify continuity of earth bonding

Is there any fault that could compromise safety?

If a fault exists, ensure no electrical supply is connected until resolved

If fault cannot be corrected immediately, implement an adequate temporary solution

Report the fault and temporary solution to the equipment owner

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?

Select the function from the table

Use the remote controller to set the unit function

Confirm the function setting on the remote controller display

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

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 new inverter P.C. board

Cut/solder Jumper wires if necessary

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

Cut the JS wire if the desired temperature is 64°F (18°C)

Solder the JS wire if the desired temperature is 50°F (10°C)

Verify the defrost finish temperature adjustment