HVAC UNIT 18 DEFINITIONS
Belly-band-mount motor - ANSWER An electric motor mounted with a strap around the motor secured
with brackets on the strap.
Cradle-mount motor - ANSWER A motor with a mounting cradle that fits the motor end housing on each
end and is held down with a bracket.
Delta transformer connection - ANSWER A transformer connection that results in a voltage output of
115V and 230V
Direct-drive motor - ANSWER A motor that is connected directly to the load, such as an oil burner motor
or a furnace fan motor.
Drip-proof motor - ANSWER A motor that can stand water dripping on it, such as a condenser fan motor
in an outdoor condensing unit.
End mount - ANSWER An electric motor mounted with tabs or studs fastened to the motor housing end.
Explosion-proof motor - ANSWER A totally sealed motor and its connections that can be operated in an
explosion atmosphere, such as in a natural gas plant.
Frequency - ANSWER The cycles per second of the electrical current supplied by the power company.
This is normally 60 cps in the United states
Full-load amperage - ANSWER A mathematical calculation used to get Underwriters Laboratories
approval for a motor that was used by compressor manufactures before 1972.
Hertz - ANSWER Cycles per second
Locked-rotor amerperage - ANSWER The current an electric motor draws when power is applied to the
motor, but its rotor is not yet turning. The LRA is normally five time the rated-load amperage.
Belly-band-mount motor - ANSWER An electric motor mounted with a strap around the motor secured
with brackets on the strap.
Cradle-mount motor - ANSWER A motor with a mounting cradle that fits the motor end housing on each
end and is held down with a bracket.
Delta transformer connection - ANSWER A transformer connection that results in a voltage output of
115V and 230V
Direct-drive motor - ANSWER A motor that is connected directly to the load, such as an oil burner motor
or a furnace fan motor.
Drip-proof motor - ANSWER A motor that can stand water dripping on it, such as a condenser fan motor
in an outdoor condensing unit.
End mount - ANSWER An electric motor mounted with tabs or studs fastened to the motor housing end.
Explosion-proof motor - ANSWER A totally sealed motor and its connections that can be operated in an
explosion atmosphere, such as in a natural gas plant.
Frequency - ANSWER The cycles per second of the electrical current supplied by the power company.
This is normally 60 cps in the United states
Full-load amperage - ANSWER A mathematical calculation used to get Underwriters Laboratories
approval for a motor that was used by compressor manufactures before 1972.
Hertz - ANSWER Cycles per second
Locked-rotor amerperage - ANSWER The current an electric motor draws when power is applied to the
motor, but its rotor is not yet turning. The LRA is normally five time the rated-load amperage.
