Scroll Sound Enclosures

Air condition or heat pump systems, properly designed around Copeland's Scroll compressor, will be inherently quieter than standard systems. On average, the compressor is up to 5 decibels quieter than standard piston compressors.

With the federal requirements for greater system efficiencies, overall system noise is usually reduced -- larger and more efficient coils allow slower fan and blower speeds that result in the compressor being a larger contributor to the total sound. Lower sound levels also make the variance between tones more noticeable.

The Scroll is the compressor of choice for its efficiency and its low sound levels. Although the scroll is quiet, it is not silent. A scroll compressor has different sound characteristics than reciprocating compressors. These sounds' characteristics do not affect system reliability or performance. Unit sound should always be considered in the placement and installation of the new unit. The homeowner should also be informed about the different type of sounds that are normal with a scroll compressor.

Should the sound characteristics prove to be objectionable to a homeowner, it must be addressed in a timely manner in the field. Understand that sound complaints can be attributed with many variables being a source, (pressure pulse, vibration, or air borne noise). A majority of application issues that result in sound complaints are caused from air borne sound from the compressor. If the system is installed and operating correctly, a Copeland sound enclosure will reduce the sound intensity considerably--usually to a level acceptable to the homeowner.

If it is suspected that the sound complaint is a design or manufacturing issue, record all useful information, and install a Copeland sound enclosure. The sound enclosure will reduce the homeowner's aggravation until a closer review can be made by the unit or compressor manufacturer. Confirm system air flow and refrigerant charge. Record compressor and unit model and serial numbers. Record system conditions (compressor pressures and temperatures, operation mode, ambient temperature, etc.). Sketch unit location and system configuration (length and size of line set, evaporator height versus condenser height, etc.). This information is vital to help understand and identify the source and its conditions so solutions can be made.