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GENERAL MECHANICAL MATERIALS AND METHODS <br />Section 15050 <br />15-1207 <br />a. Refer to Drawings for voltage requirements. <br />b. Totally enclosed motors rated 3/4 HP, 1200 rpm, or 1 HP and larger, and all <br />drip -proof motors shall have a 1.15 continuous -duty service factor at 40°C <br />ambient temperature. <br />C. Insulation system shall be NEMA Class F or better. <br />d. Provide double -shielded, grease -lubricated ball bearings with grease pockets <br />on each side for regreasing in service. <br />e. Provide inlet and outlet grease connections in 7.5 HP and larger motor <br />housings for each bearing. <br />f. Motors 5 HP and smaller and all roof -mounted equipment motors shall be <br />provided with factory sealed, permanently lubricated ball bearings. <br />4. Motors smaller than 1/2 HP shall be single phase, 110 volt permanent split -capacitor <br />type with integral thermal overload protection. Bearings shall be factory sealed, <br />permanently lubricated ball type. <br />5. Provide totally enclosed motors, or suitable protection per NEMA Standards, in <br />locations exposed to the weather or dripping water and in air handling units <br />downstream of cooling coils and heat recovery coils. Other motors shall be open <br />drip -proof. <br />6. Multi -speed motors shall be provided where specifically scheduled. <br />7. Motors feed by variable frequency drives (VFD) shall be specifically designed by <br />motor manufacturers for variable frequency drive application. <br />8. Minimum Efficiency and Power Factor: Minimum Power Factor shall be 85 percent <br />minimum, in all sizes, and minimum efficiency shall be as follows, for 1,750 rpm <br />motors as tested in accordance with NEMA Table 12-6D. The minimum efficiencies <br />shall be guaranteed. <br />Motor HP..... Efficiency Percent <br />1 ............................85.5 <br />1-1/2 ......................86.5 <br />2 ............................86.5 <br />3 and 5 ................... 89.5 <br />7-1/2 and 10...........91.0 <br />9. Overload protection: Built-in thermal overload protection and, where indicated, <br />internal sensing device suitable for signaling and stopping motor at starter. <br />10. Noise rating: Comply with ANSI/NEMA MG 1."Quiet" rating on motors located in <br />occupied spaces of building. <br />11. Nameplate: Indicate the full identification of manufacturer, ratings, characteristics, <br />construction, special features and similar information. <br />C. Acceptable Manufacturers: <br />1. Reliance <br />2. Baldor <br />3. US Motors <br />2 <br />