Mitsubishi Split System SUZ-AA18NLHZ-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

Ensure all safety equipment is in place

Check for ignition sources in the vicinity

Use an appropriate refrigerant detector to check the area

Monitor the area continuously for toxic or flammable atmospheres

Leak Detection Equipment Verification

Confirm leak detection equipment is nonsparking

Ensure no potential sources of ignition are present in the area.

Confirm that no halide torch or naked flame detectors are used.

Calibrate electronic leak detectors in a refrigerant-free area.

Is the detector suitable for the refrigerant used and not a potential source of ignition?

Set leak detection equipment to a percentage of the LFL of the refrigerant (25% maximum).

Select acceptable leak detection methods used

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 the electrical supply been disconnected until resolved?

If the fault cannot be corrected immediately, has an adequate temporary solution been implemented?

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