Design and Construction Handbook - Los Angeles World Airports

Guide Specification
GUARANTEED MINIMUM FULL LOAD
EFFICIENCY OF MOTORS
Rated Nominal Nominal 1800
HP 1200 RPM RPM
1 82.5 85.5
1.5 86.5 86.5
2 87.5 86.5
3 89.5 89.5
5 89.5 89.5
7.5 91.7 91.0
10 91.7 91.7
15 92.4 93.0
20 92.4 93.0
25 93.0 93.6
30 93.6 94.1
40 94.1 94.1
50 94.1 94.5
60 95.0 95.0
75 95.0 95.0
100 95.0 95.4
125 95.4 95.4
150 95.8 95.8
200 95.4 95.8
5. Motor Location: Mounted outside of cooling tower casing and cooling tower
discharge airstream.
6. Severe-duty rating with the following features:
a. Rotor and stator protected with corrosion-inhibiting epoxy resin.
b. Double-shielded, vacuum-degassed bearings lubricated with premium,
moisture-resistant grease suitable for temperatures between minus 20 and
plus 300 deg F.
c. Internal heater automatically energized when motor is de-energized.
7. Motor Base: Adjustable, or other suitable provision for adjusting belt tension.
P. Fan Discharge Stack: Material shall match casing, manufacturer's standard design.
1. Stack Extension: Fabricated to extend above fan deck.
2. Stack Termination: Wire-mesh, stainless-steel screens.
Q. Gear-Drive, Oil-Level Switch: Low-oil-level warning switch for connection to a BMS.
1. Switch shall, on reaching a low-oil-level set point recommended by cooling
tower manufacturer, signal an alarm through the BMS.
R. Controls: See Section "Building Automation System."
S. Control Package: Factory installed and wired, and functionally tested at factory before
shipment.
1. NEMA 250, Type 4X enclosure with removable internally mount backplate.
2. Control-circuit transformer with primary and secondary side fuses.
3. Terminal blocks with numbered and color-coded wiring to match wiring
COOLING TOWERS
23 65 00 - 7 Mechanical Systems