Mitsubishi Split System SUZ-AA15NLHZ-U1

Electrical Components Inspection

Ensure electrical components are fit for purpose and to the correct specification

Manufacturer's Guidelines Compliance

Follow manufacturer's maintenance and service guidelines

Consult manufacturer's technical department if in doubt

Verify refrigerant charge is in accordance with room size

Check ventilation machinery and outlets for adequate operation and obstructions

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

Ensure the pre-heat control is turned ON if the temperature is 68°F (20°C) or below.

Measure the power consumption of the compressor when pre-heat control is ON.

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

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

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

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 setting

Document any changes made to the JS wire

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

Ensure that hoses or lines are as short as possible

Keep cylinders in an appropriate position according to the instructions

Ensure that the REFRIGERATING SYSTEM is earthed prior to charging

Charge the system with refrigerant

Label the system when charging is complete

Ensure extreme care is taken not to overfill the REFRIGERATING SYSTEM

Ensure capacitors are discharged safely to avoid sparking.

Check that no live electrical components and wiring are exposed during operations.

Verify continuity of earth bonding.

Is there a fault that could compromise safety?

If a fault exists, has it been satisfactorily dealt with before connecting electrical supply?

If the fault cannot be corrected immediately, is there an adequate temporary solution in place?