DANGER: Indicates an essential operation or maintenance procedure, practice, or condition which, if not strictly
observed, could result in injury to or death of personnel or long-term health hazards. A Danger notification is
displayed in the format shown below.
• • • DANGER! • • •
CAUTION: Indicates an essential operation or maintenance procedure, practice, or condition which, if not strictly
observed, could result in damage to or destruction of equipment or potential problems in the outcome of the
procedure being performed. A Caution notification is displayed in the format shown below.
• • • CAUTION • • •
Table 1-2 Acronyms and Terms
Acronym/Term Definition
Alarms Alarms indicate a condition at the limit of the normal operating envelope. Compressor
alarms will still allow the compressor to run, but speed is reduced to bring the alarm
condition under the alarm limit.
AHRI Air-Conditioning, Heating, and Refrigeration Institute (www.ari.org;www.ahrinet.org).
ANSI American National Standards Institute.
ASHRAE American Society of Heating Refrigeration and Air-Conditioning Engineers
(www.ashrae.org).
Axial Bearing Bearing that controls the horizontal movement (Z axis) of the motor shaft.
Backplane A printed circuit board (PCB) for the purpose of power and control signal transmission.
Many other components connect to this board.
BMCC Bearing Motor Compressor Controller. The BMCC is the central processor board of the
compressor. Based on its sensor inputs, it controls the bearing and motor system and
maintains compressor control within the operating limits.
Bus Bars Heavy-gauge metal conductors used to transfer large electrical currents.
Capacitor A passive component that stores energy in the form of an electrostatic field.
Cavity Sensor Negative Temperature Coefficient (NTC) temperature sensor located behind the
Backplane for the purpose of sensing motor-cooling vapor temperature. Provides
Page 12 of 136 - M-AP-001-EN Rev. S 9/8/2021
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