Variable-Speed Compressor Tables: Capacity, RPM and COP Explained
A variable-speed compressor table describes performance across defined operating conditions. The supplied two-page technology brochure is useful for understanding the portfolio, but its ranges, test conditions and preliminary-data footnote must stay attached to the selected model.
| Field | What it tells you | What it does not establish |
|---|---|---|
| Capacity [W] | Cooling at the stated rating basis | Every cabinet operating condition |
| Rotation [rpm] | Model-specific speed range | Approval for a different inverter |
| Maximum COP [W/W] | Ratio at stated conditions | A fixed electricity-bill saving |
| Preliminary marker | Data still under test in that brochure | Final current performance approval |
Capacity ranges need a speed and rating context
The brochure lists compressor model, refrigerant, application, displacement, evaporating range, rating point, rotation range, capacity and maximum COP. A capacity range is not a promise that every point is available in every cabinet or under every pressure condition. [Source 15, PDF p. 2.]
For example, the VESF9C row gives a 950-4,500 rpm rotation range and 47-188 W capacity at the table's stated ASHRAE LBP basis. Those are model-specific entries. They should not be assigned to another VES, FMF or VNEX model because the family names appear together.
Do not mix LBP and MBP rating points
The footnote defines separate ASHRAE LBP and EN12900 MBP rating conditions. A larger capacity figure from a different rating point is not, by itself, evidence of a more suitable replacement. Compare like conditions and the intended application envelope before interpreting the numbers. [Source 15, PDF p. 2.]
This is also why horsepower and displacement should be treated as screening information rather than a complete selection method. The compressor's current performance data and approved application remain necessary.
COP is not an electricity-bill percentage
COP expresses cooling performance relative to power input under a specified condition. A maximum-COP entry does not establish the average efficiency of a complete refrigerator over its duty cycle. Do not turn a brochure maximum into a fixed customer energy-saving promise.
System controls, heat exchangers, load and operating conditions need their own assessment. A useful comparison reports the test basis and model alongside the ratio instead of ranking all rows by one isolated number.
Preserve the preliminary-data warning
The supplied brochure marks the VNEX entries with a note that products were still under testing and the displayed performance was preliminary. That note should not disappear when the table is summarized. Obtain current final model data before making a specification or purchase commitment. [Source 15, PDF p. 2.]
Match the compressor and inverter together
A variable-speed compressor requires the approved inverter, control configuration and installation conditions for its application. A technology brochure does not establish that the store's VCC3 board or an arbitrary CF-family inverter is a suitable match.
Use the brochure to understand the selection fields, then obtain the current compressor datasheet, approved drive pairing and equipment service information. Internal electrical work and sealed-system changes require qualified personnel. The outcome should be a documented application decision, not a selection based on the highest capacity or maximum COP in a mixed-condition table.
Source documents and edition scope
- Source 15: Variable-speed technology.pdf; No edition date established; VNEX rows marked preliminary. Page citations in this article refer to physical PDF pages unless a printed page is identified.
Original analysis based on the supplied Embraco documents. Selected source passages are summarized, rather than reproducing the manuals. This is an independent educational article, not manufacturer approval of a replacement product. Obtain current application documents through Embraco documentation and the equipment manufacturer.