What Does the Y Suffix Mean in BITZER ECOLINE Compressors?

If you're selecting a BITZER semi-hermetic reciprocating compressor, you may notice that some model numbers have a Y suffix, while others do not.

For example:

2HES-1

2HES-1Y

These models may look almost identical, but they are designed for different refrigerant applications. The difference is also related to the type of lubricating oil used in the compressor.

So, how can you identify the correct version for your refrigeration system?

Let's look at what the Y suffix means and why it matters when selecting or replacing a compressor.

1. What Does the Y Suffix Mean?

In the standard BITZER semi-hermetic reciprocating compressor range, the Y suffix identifies the POE oil version.

The two corresponding versions have different refrigerant applications:

For example:

2HES-1: R22 version, charged with B5.2 mineral oil.

2HES-1Y: Non-R22 version, charged with POE oil.

This means Y is an oil identification code rather than a refrigerant designation. However, because the two oil configurations correspond to different refrigerant applications, the suffix also helps you identify which compressor version you need.

2. Why Does R22 Use Mineral Oil, While Many Other Refrigerants Use POE Oil?

The main reason is compatibility between the refrigerant and the lubricating oil.

R22 is compatible with conventional mineral refrigeration oil. This is why BITZER specifies B5.2 mineral oil for the corresponding ECOLINE compressor version.

Many HFC and HFO refrigerants, such as R134a, R404A, R407C, R448A and R449A, have different compatibility characteristics with mineral oil. POE oil is therefore used in the corresponding compressor versions.

For the standard ECOLINE models discussed here:

If your system uses R22, the corresponding compressor version uses B5.2 mineral oil.

If your system uses an approved non-R22 refrigerant, the corresponding Y version uses POE oil, with BSE32 as the standard oil specification.

3. Can I Use a Y-Version Compressor With Any Non-R22 Refrigerant?

No. The Y suffix does not mean that the compressor supports every refrigerant other than R22.

Even among HFC and HFO refrigerants, operating pressures, temperatures and other characteristics can vary considerably.

Before choosing a refrigerant for your compressor, you should check:

• Whether the refrigerant is approved for your exact compressor model.
• Whether your required operating temperatures and pressures are within the manufacturer's limits.
• Whether the specified lubricating oil is suitable for your application.

You should always confirm refrigerant compatibility using BITZER's official product documentation or BITZER SOFTWARE rather than relying on the Y suffix alone.

4. What Should I Check Before Replacing My Compressor?

If you're replacing an existing BITZER compressor, don't select a replacement based only on similar model numbers or nominal cooling capacity.

Make sure you check the following:

• Refrigerant: What refrigerant does your existing system use? Is it R22 or another approved refrigerant?
• Model suffix: Does your original compressor have a Y suffix?
• Lubricating oil: Does the replacement require mineral oil or POE oil? Is the specified oil grade correct?
• Technical specifications: Does the replacement match your required cooling capacity, operating conditions, voltage, frequency and motor version?

A compressor with Y should not automatically replace the corresponding model without Y, or vice versa.

Before purchasing, confirm that the refrigerant application and complete technical specifications are suitable for your system.

Conclusion

When you're identifying a BITZER semi-hermetic reciprocating compressor, the presence or absence of the Y suffix is an important detail.

The distinction is:

• Without Y: Designed exclusively for R22 and charged with B5.2 mineral oil.
• With Y: Designed for approved non-R22 refrigerants and charged with POE oil, with BSE32 as the standard specification.

The Y suffix identifies the POE oil version, while the corresponding compressor configuration determines its refrigerant application.

By checking the complete model number, refrigerant compatibility and oil specification, you can avoid selecting an unsuitable compressor when purchasing or replacing your equipment.