HVAC Motor Series

ATT  Heating, Ventilation, and Air Conditioning (HVACSeries motors are designed with dynamically balanced rotors for reduced vibration and quiet operation. They include heavy duty industrial designs as well as designs for commercial applications.


These applications include ventilators, direct drive and belted fans, exhaust fans, unit heaters, air conditioning units, and commercial refrigeration condensers. Also included are motors designed especially for use with variable speed drives (VSDs) that are used to conserve electricity.

Item Standard Specifications
Type of Motor Totally Enclosed Air Over (TEAO) Squirrel Cage Cast Iron / Aluminium Induction Motor
Design Standard IEC 60034-1
Framesize 80-355L
Voltage and Frequency Standard stock available are:

220-240/380-415V/50Hz for 2.2 KW & below

380-415/660-720V/50Hz for 3KW & above

Other voltages & frequency such as 200V, 346V, 440V & 60Hz can be supplied on request

Power Conditions ± 5% of rated voltage; ± 1% frequency and ± 1% phase unbalance
Efficiency Standard IE1 / IE2 / IE3 (IEC 60034-30-1)
Time Duty Continuous S1
Cooling Method TEFC (IC 411); TEAO (IC 418)
Method of Starting Full voltage direct on line starting or star-delta starting
Insulation & Temperature Rise Class Class F insulation and Class B temperature rise
Degree of Protection IP55
Rotor Winding Squirrel cage, aluminium conductor with end-ring and wafter blades integrally cast
Environmental Conditions Place: Non-hazardous, shaded

Ambient temperature: -20°C to 40°C

Relative humidity: Less than 90% relative humidity (non-condensation)

Altitude: Up to 1,000 metres above sea level

Direction of Rotation Standard motors are suitable for operation in either direction of rotation of shaft.

Direction of rotation can be reversed by interchanging any two of the power lines.

Test Procedure IEC and full voltage measuring starting operation
Fan Cover Pressed steel
Shaft Carbon Steel, round shaft with key
Bearing Grease pre-packed shielded ball bearing
Lubrication Lithium-base grease (Shell Alvania R3)
Painting Phenolic rust-proof base plus lacquer surface finish. Painting in ATT Blue
Ground Terminal NE set inside the terminal box


Other Options Available (Contact ATT to inquire for other options)
Accessories Can be supplied with separate terminal box and 1 meter extended lead wires
VSD Driven Inverter duty motor suitable for VSD operation
Heaters Space heaters (110V/220V/1ph) or winding heaters available on request
Thermal Protection PTC thermistor 150°C
Insulation Class Class H
Degree of Protection Up to IP66

The table below contains the various types of mounting available for HVAC Motor Series. If you are unable to find the dimensions to the mounting you prefer, please contact us for the outlining dimensions.