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DocuSign Envelope ID: 9826C043- 4C32- 49CD- A4CC- DC28ABAB7CE7 <br />SECTION 237530 - COMMON MOTOR REQUIREMENTS FOR HVAC EQUIPMENT <br />PART 1 - GENERAL <br />1.1 SUMMARY <br />A. Section includes general requirements for single -phase and polyphase, general - purpose, horizontal, <br />small and medium, squirrel -cage induction motors for use on ac power systems up to 600 V and <br />installed at equipment manufacturer's factory or shipped separately by equipment manufacturer for <br />field installation. <br />1.2 COORDINATION <br />A. Coordinate features of motors, installed units, and accessory devices to be compatible with the <br />following: <br />1. Motor controllers. <br />2. Torque, speed, and horsepower requirements of the load. <br />3. Ratings and characteristics of supply circuit and required control sequence. <br />4. Ambient and environmental conditions of installation location. <br />PART 2 - PRODUCTS <br />2.1 GENERAL MOTOR REQUIREMENTS <br />A. Comply with requirements in this Section except when stricter requirements are specified in HVAC <br />equipment schedules or Sections. <br />B. Comply with NEMA MG 1 unless otherwise indicated. <br />2.2 MOTOR CHARACTERISTICS <br />A. Duty: Continuous duty at ambient temperature of 40 deg C and at altitude of 3300 feet above sea <br />level. <br />B. Capacity and Torque Characteristics: Sufficient to start, accelerate, and operate connected loads at <br />designated speeds, at installed altitude and environment, with indicated operating sequence, and <br />without exceeding nameplate ratings or considering service factor. <br />2.3 POLYPHASE MOTORS <br />A. Description: NEMA MG 1, Design B, medium induction motor. <br />B. Efficiency: Premium efficiency, as defined in NEMA MG 1. <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 />Reece, Noland & McElrath, Inc. 237530-1 NOrange County Board of Elections <br />Orange Co., NC 05/04/18 <br />