Very rarely, despite the name.

Most conversions need the expansion device adjusted.

Many need an oil change as well.

All need re-commissioning rather than assumption.

Treat the term as marketing, not specification.

Ask the manufacturer for the conversion procedure.

Older systems ran on mineral oil.

It does not return well with modern refrigerants.

Oil then lies in the evaporator instead.

The compressor is starved over time.

Some blends tolerate mineral oil deliberately.

That tolerance is often why they are chosen.

How superheat and subcooling are measured.

The blend evaporates across a range, not at a point.

Pressure-temperature charts need the right columns.

Settings made as for a single-component refrigerant are wrong.

Technicians need to know before they arrive.

It also affects fault diagnosis.

The components leave the cylinder at different rates.

Charging vapour changes the composition.

The system ends up with a blend it was not sold.

Performance and safety properties shift with it.

Liquid charging keeps the mixture correct.

This applies to topping up as well.

Usually not exactly.

Conversions typically shift capacity and power draw.

Confirm the result against the actual load.

A marginal system can become inadequate.

Measure after conversion rather than assuming.

Adjust controls to the new behaviour.

What it now contains, and what was changed.

A label stating refrigerant and oil type.

The date and who carried out the conversion.

The next technician relies entirely on this.

Many jurisdictions require the record.

An unlabelled converted system is a hazard.

When the plant is near end of life anyway.

Conversion cost can approach replacement cost.

New plant runs on current refrigerant natively.

It is usually more efficient as well.

Compare against replacement before committing.

Age and condition decide it more than price.