Compact Cooling Tower Gets a Design Boost
Description
Redesigned Marley AV line of single flow cooling towers now features a new induced draft crossflow design and a broader tonnage range from 122 to 772 nominal tons and flowrate of 117 to 1541 gpm (27 to 350 m3/hr) on single and multi-fan models. The AV provides a compact footprint and is well-suited to support air conditioning and refrigeration systems as well as light industrial loads.
A bearing housing belt drive system is standard equipment; the Marley Geareducer and motor outside airstream (MOA) options are available on some models. Other popular selections include welded stainless steel basins, sweeper piping, interior mechanical and access door platforms, slip-resistant plenum walkway and hot water basin guardrail system for safe and easy inspection and maintenance.
Featuring the new, patent-pending MarKey Drift Eliminators, the AV Cooling Tower achieves the lowest measureable drift rate, down to 0.0005% of circulating water flow, so less water escapes the tower. Quiet and ultra-quiet fan options are factory installed on most models. Control packages offer single point power connections for a range of systems. The AV is certified by the Cooling Technology Institute (CTI) and multi-cell models are Factory Mutual approved. The line is available worldwide.
Specs
AV Water Distribution System
- Gravity flow distribution system. Easy, nonrestrictive maintenance. Basin covers are standard.
- Marley Spiral Target polypropylene nozzles for consistent, predictable water distribution.
- Marley MX75 thermoformed PVC film fill is suspended from the upper cooling tower structure by heavy galvanized steel support members providing clearance between fill and sloping self-cleaning collection basin floor for easy basin cleaning. Integral eliminators and louvers keep circulating water confined to fill over a wide range of air flow rates.
AV Structure
- Crossflow configuration — easier and safer to inspect, service and maintain.
- G-235 heavy galvanized steel. Also available in 300 series stainless steel.
- Factory-assembled modules, including fan cylinders — makes final field installation hassle-free.
- Large Access Doors — the generous plenum region in the AV cooling tower is nonconfining, permitting quick visual inspection of cold water basin, internal structure, drift eliminators and mechanical equipment.
AV Air Movement System
- Heavy duty aluminum alloy fan– adjustable pitch blades.
- 7.5 hp and larger fans are driven by a high quality, solid backed, multi-grooved neoprene and polyester v-belt thru a corrosion resistant aluminum alloy fan sheave.
- Heavy duty, self-aligning, grease lubricated roller bearings selected with an L10 design life of 50,000 to 100,000 hours support the fan and shaft.
- TEFC fan motor, 1.15 service factor, variable torque design, specially insulated for cooling tower duty.
- The AV air movement system is guaranteed against failure for a period of five full years from date of shipment. Includes fan, fan shaft, bearings and mechanical equipment support.
Key Benefits
- Ideal Replacement Designed to easily replace forced draft blower cooling towers or other space sensitive installations.
- Low Energy Costs Highly efficient propeller fans consume half the energy of blowers. And, gravity water distribution provides further savings thru lower total pump head.
- Easy Access Large, 23 x 52-in. access doors on both endwalls and “stand-up" area help make the AV easy to service with generous access to the basin and mechanical equipment.
- Low Piping Costs Single inlet connection for easy and fast installation.
- Long Life Rugged G-235 galvanized steel frame, quality factory assembly. (Optionally available in 300 series stainless steel.)
- All Season Reliability Integral louvers eliminate splash-out so cooling towers operate virtually ice-free in the winter.
- Real World Design Designed for severe wind, seismic, shipping, operating and live loads.
- Tough MX75 High-Performance Fill Highly efficient cellular drift eliminators and honeycomb louvers integrally molded within the fill sheets.
- Aluminum-Alloy Axial Fan Adjustable-pitch fan blades permit maximum utilization of rated horsepower and allows field adjustment to optimize tower performance.
- Rugged Fan Motor TEFC 1.15 service factor, severe duty, cast iron motor designed to Marley specifications for cooling tower duty. Specially insulated for extra protection from moisture.
- Five-Year Mechanical Warranty Five-year mechanical equipment warranty.
Optional Equipment and Accessories
- Stainless Steel Distribution Basin
Corrosion is usually most aggressive in the hot water distribution basins—stainless steel provides assurance of long, trouble-free service life.
- Marley Control System Package
Factory-wired, factory-installed, factory-tested control center in NEMA 3R enclosure mounted on cooling tower casing near access door. Complete with thermostat controller for single or two-speed motors to maintain chosen cold water temperature.
- Inlet Trash Screens
Factory-installed, U-edged, galvanized wire mesh screens work in concert with the internal cellular louvers.
- External Service Platform
Provides easy access to distribution system without increasing installed height of cooling tower. Platform with OSHA guardrails is Factory Mounted, eliminating installation labor cost and time. Field-installed ladder with optional safety cage for easy access.
- Welded Stainless Steel Collection Basin
All collection basin parts in the wetted area— including structural members projecting in the basin, assembly and attaching hardware, and all basin options, are heavy-gauge Series 300 stainless steel.