Audel HVAC Fundamentals by James E Brumbaugh

Author:James E, Brumbaugh
Language: eng
Format: epub
Publisher: Wiley
Published: 2011-01-24T16:00:00+00:00

Table 7-6 Nominal Full-Load Ampere Ratings for Three-Phase Motors

Table 7-7 Ampere Rating Table for Airmaster Fans

Overload relay heaters should not be selected solely on the basis of the data listed in Tables 7-5 and 7-6. Heaters must be selected in accordance with the actual motor current as shown on the nameplate. It is also important that ambient temperatures of the area in which the motor control is located be taken into consideration when making heater selections. Ambient compensated overload relays are available for abnormal temperature conditions.

Typical connection diagrams for two-speed, three-phase motors are illustrated in Figures 7-11 and 7-12. Two-speed motors are available for most fan lines. Because all two-speed motors are always single-voltage, it is necessary to specify the available line voltage phase and frequency when ordering.

Examples of fans equipped with the belt-drive arrangement and direct-connected motors are shown in Figures 7-13 and 7-14.

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