Laserfiche WebLink
INDIAN RIVER COUNTY JULY 25, 2014 <br />INTERGENERATIONAL RECREATION CENTER 100% CONSTRUCTION DOCUMENTS <br />C. Service Factor: 1.15. <br />D. Multispeed Motors: Variable torque. <br />1. For motors with 2:1 speed ratio, consequent pole, single winding. <br />2. For motors with other than 2:1 speed ratio, separate winding for each speed. <br />E. Rotor: Random -wound, squirrel cage. <br />F. Bearings: Regreasable, shielded, antifriction ball bearings suitable for radial and thrust loading. <br />G. Temperature Rise: Match insulation rating. <br />H. Insulation: Class F. <br />Code Letter Designation: <br />1. Motors Smaller than 15 HP: Manufacturer's standard starting characteristic. <br />J. Enclosure Material: Cast iron for motor frame sizes 324T and larger; rolled steel for motor <br />frame sizes smaller than 324T. <br />2.4 POLYPHASE MOTORS WITH ADDITIONAL REQUIREMENTS <br />A. Motors Used with Variable Frequency Controllers: Ratings, characteristics, and features <br />coordinated with and approved by controller manufacturer. <br />1. Windings: Copper magnet wire with moisture -resistant insulation varnish, designed and <br />tested to resist transient spikes, high frequencies, and short time rise pulses produced by <br />pulse -width modulated inverters. <br />2. Energy- and Premium -Efficient Motors: Class B temperature rise; Class F insulation. <br />3. Inverter -Duty Motors: Class F temperature rise; Class H insulation. <br />4. Thermal Protection: Comply with NEMA MG 1 requirements for thermally protected <br />motors. <br />2.5 SINGLE-PHASE MOTORS <br />A. Motors larger than 1/20 hp shall be one of the following, to suit starting torque and requirements <br />of specific motor application: <br />1. Permanent -split capacitor. <br />B. Multispeed Motors: Variable -torque, permanent -split -capacitor type. <br />C. Bearings: Prelubricated, antifriction ball bearings or sleeve bearings suitable for radial and <br />thrust loading. <br />Motors 1/20 HP and Smaller: Shaded -pole type. <br />E. Thermal Protection: Internal protection to automatically open power supply circuit to motor <br />when winding temperature exceeds a safe value calibrated to temperature rating of motor <br />insulation. Thermal -protection device shall automatically reset when motor temperature returns <br />to normal range. <br />COMMON MOTOR REQUIREMENTS FOR HVAC EQUIPMENT 230513 - 2 <br />