Laserfiche WebLink
2. Sheaves: Adjustable. <br /> 3. Belts: Oil-resistant,nonsparking,and nonstatic. <br /> G. Accessories: The following accessories are required as indicated: <br /> 1. Inlet and Outlet Screens: Heavy wire mech inlet screens on fans not connected to ductwork <br /> 2. Backdraft Dampers: Butterfly-style for mounting with flexible connection to the discharge of the fan, or <br /> direct-mounted to the discharge diffuser section. <br /> 3. Stall Alarm Probe: A sensing probe capable of detecting fan operation in stall and sending a signal to the <br /> building automation system Control devices and sequence of operation are specified in other Division 15 <br /> sections. <br /> 4. Flow Measurement Port: Pressure measurement taps installed in the inlet of the fan to detect and signal air <br /> flow readings to temperature control systems. Control devices and sequence of operation specified in other <br /> Division 15 sections. <br /> 5. Airtight Acoustical Enclosure <br /> 2.08 MOTORS <br /> A. Torque Characteristics: Sufficient to accelerate the driven loads satisfactorily. <br /> B. Motor Sizes: Minimum sizes and electrical characteristics as indicated. If not indicated, large enough so that the <br /> driven load will not require the motor to operate in the service factor range. <br /> C. Temperature Rating: 50 deg C maximum temperature rise at 40 deg C ambient for continuous duty at full load <br /> (Class A Insulation). <br /> D. Service Factor. 1.15 for polyphase motors and 1.35 for single-phase motors. <br /> E. Motor Construction: NEMA Standard MG 1,general purpose,continuous duty,Design B. Provide permanent-split <br /> capacitor classification motors for shaft-mounted fans and capacitor start classification for belted fans. <br /> 1. Bases: Adjustable. <br /> 2. Bearings: The following features are required: <br /> a. Ball or roller bearings with inner and outer shaft seals. <br /> b. Grease lubricated <br /> c. Designed to resist thrust loading where belt drives or other drives produce lateral or axial thrust in motor. <br /> 3. Enclosure Type: The following features are required: <br /> a. Open drip-proof motors where satisfactorily housed or remotely located during operation. <br /> b. Guarded drip-proof motors where exposed to contact by employees or building occupants. <br /> 4. Overload protection: Built-in,automatic reset,thermal overload protection. <br /> 5. Noise rating: Quiet. <br /> 15850-7 No.99132-CP2 <br />