2,400+ Definitions

HVAC GLOSSARY

Every HVAC term, acronym, and industry phrase — defined in plain English.

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Motion Sensor HVAC
Motion sensor HVAC systems use motion detection technology to automatically…
Motor Efficiency
Motor efficiency is the ratio of mechanical power output to…
Motor Enclosure
Motor Enclosure is the physical housing that protects motor windings…
Motor Insulation Class
Motor Insulation Class designates the maximum temperature rating for motor…
Motor Lubrication
Motor lubrication is the preventive maintenance process of lubricating motor…
Motor Nameplate
The motor nameplate is the permanent label affixed to electric…
Motor Nameplate Service Factor
A multiplier applied to the nameplate horsepower rating indicating the…
Motor Overload
Motor Overload occurs when a motor draws sustained current exceeding…
Motor Protection Module
An integrated solid-state device that combines overload, phase loss, phase…
Motor Run Capacitor
A motor run capacitor continuously supplies voltage to single-phase motors…
Motor Service Factor
Motor Service Factor (SF) is a multiplier that indicates how…
Motor Start Capacitor
A motor start capacitor is a high-capacity electrical component that…
Motor Starting Current
Motor Starting Current is the high inrush current flowing when…
Motor Test
Motor testing encompasses multiple diagnostic procedures including current draw measurement,…
Motorized Damper
A motorized damper is an electronically controlled device that regulates…
MPPT
MPPT (Maximum Power Point Tracking) is a technology that continuously…
Multi Stage Furnace
A multi-stage furnace is a gas-fired heating appliance designed to…
Multi-Zone Mini-Split
A ductless system in which a single outdoor unit connects…
Multizone Airflow Network
A building simulation approach that models each room as a…
Multizone Unit
A multizone unit is a centralized HVAC system designed to…
MW
A megawatt (MW) represents one million watts or 1,000 kilowatts…