Power (kW)
Voltage
Type Starter
delta
Above 22 1/2
460
Part winding or wye delta
Motor H.P.
Voltage
Type Starter
Up to 7 1/2
208-230
Across-the-line magnetic
7 1/2 to 15
208-230
Across-the-line magnetic
part winding or wye
delta
15 to 30
460
Across-the-line
magnetic, part winding
or wye delta
Above 15
208-230
Part winding or wye
delta
Above 30
460
Part winding or wye delta
**************************************************************************
Conform to NEMA MG 1 and NEMA ICS 1 and NEMA ICS 2. Motors shall not
exceed 1800 rpm, unless otherwise indicated, and shall be [[open]
[dripproof] enclosure] [totally enclosed fan cooled] [explosion proof]
type. Provide [manual] [magnetic-across-the-line] [reduced voltage]
[part-winding] [wye-delta] type motor starters with [general-purpose NEMA
1] [weather resistant NEMA 3R] [watertight NEMA 4] [moisture and dusttight
NEMA 12] enclosure in accordance with NEMA ICS 6. Provide single-phase
motors with inherent thermal overload protection with manual reset. Provide
three-phase motors with thermal overload protection in the control panel.
Provide permanently lubricated or grease-lubricated ball or roller
bearings; auxiliary lubrication and relief fittings on outside of fan
casing; arrange grease lines to minimize pressure on bearing seals. Motor
power shall not be less than brake power required with blades set at
maximum pitch angle at any air delivery from the indicated amount down to
50 percent thereof.
2.1.4
Guards and Screens
Construct guards and screens to provide, as applicable: required strength
and clearance with minimal reduction in free area at fan inlets and
discharges; cooling; access panels for tachometer readings; ease of
sectional disassembly for maintenance and inspection functions where guard
total weight exceeds 22.70 kg 50 pounds; weather protection where
components are weather exposed. Installed guards and screens shall not
negate noise control and vibration isolation provisions. [For burn
protection, insulate surfaces when service temperatures exceed 60 degrees C
140 degrees F as part of work under Section 15080 THERMAL INSULATION FOR
MECHANICAL SYSTEMS.]
2.1.5
Power Transmission Components
2.1.5.1
Fan Drives
[Direct] [or] [V-belt] type as indicated. V-belt drives shall conform to
ANSI IP-20 and ANSI IP-22. Drives shall be applied in accordance with the
SECTION 15801N
Page 16
Previous Page
