scope:

This standard applies to Hermetic, Open Type (External-drive), Semi-hermetic, Fixed Displacement, Discrete Modulating, and Continuous Modulating Compressors. In the case of External-drive Refrigerant Compressors, the driving mechanism shall be excluded from the sound and vibration measurements. However, for Semi-hermetic Refrigerant Compressors where the driving mechanism is an integral part of the compressor assembly as defined in Section 3, it shall be included in the measurements.

Exclusion.

Vibration measurements for an Open Type (External-drive) Refrigerant Compressor, coupling and motor assembly mounted on a common base is excluded from this standard, since the vibration measurement method specified in the standard does not apply to this type of product. Sound Power testing shall exclude the motor assembly's contribution to the Sound Power measurement when applicable. Sound Power, Vibration and Discharge Pulse measurements for Continuous Modulating Compressors during cyclic load intervals are excluded from this standard since steady state conditions are required during measurements.

Purpose.

The purpose of this standard is to establish for the rating of sound and vibration for Positive Displacement Refrigerant Compressors: definitions; test requirements; rating requirements; minimum data requirements for published ratings; and conformance conditions.