Specifications
Specification Value
Marley
/
MD Cooling Tower
/
Specifications: Base
30
shall be driven through a one-piece
multi-groove,solidbackV-typebelt,
sheaves(pulleys),andtaperedroller
bearings. Bearings shall be rated at an
L
10
life of 100,000 hours, or greater.
Bothmotorandfansheaves(pulleys)
shall be all cast aluminum to prevent
premature corrosion.
6.2 Motor(s)shallbe____kWmaximum,
TEFC, variable torque, inverter duty
and specially insulated for cooling
tower duty. Speed and electrical char-
acteristicsshallbe______RPM,single-
winding, ___ phase, ____ hertz, ____
volts. Motor nameplate power shall
not be exceeded at design operation.
TEAO motors are not acceptable.
6.3 The complete mechanical equipment
assembly for each cell shall be support-
ed by a rigid, hot-dip galvanized steel
structural support that resists misalign-
ment between the motor and sheaves
(pulleys).Forbelt-drivetowerswith
motors inside the airstream, motors
shall be mounted on an adjustable base
that swivels outside the access door
for maintenance. For belt-drive tow-
ers with motors mounted outside the
airstream, a protective cover shall be
mounted over the motor and sheave to
protect it from the weather and prevent
inadvertent contact. The mechanical
equipment assembly shall be warranted
against any failure caused by defects
in materials and workmanship for no
lessthanve(5)yearsfollowingthe
date of tower shipment. This warranty
shall cover the fan, speed reducer, drive
shaft and couplings, and the mechanical
equipment support. The electric motor
shall carry a manufacturer's warranty of
at least one year. The bearing assem-
bliesandV-beltsshallbewarrantedfor
18 months.
sheaves, power band belts and long-life bearings for dependable ser-
vice.
TEFC motors offer additional benefits over TEAO motors whose only
source of cooling is the flow of air produced by the cooling tower fan.
This air rate is not always ideal due to motor position, blockage, etc.
TEFC ensures the motor will always be cooled properly.
Unless otherwise specified, motor speed will be 1500 RPM in on stan-
dard models. Low noise models will use motor speeds appropriate for
the specific model. If you prefer the operating flexibility of two-speed
operation, please specify two-speed, single-winding motors which
offer full and half speeds for maximum energy savings. Incidentally,
two speed motors are a far better choice than separate “pony” motors
which simply double the problems indicated above and induce parasitic
loads during operation for lower than nameplate efficiency.
The value of a 5 year mechanical equipment warranty speaks for
itself. Except for the motor, virtually all of the mechanical equipment
on a Marley tower is designed and manufactured by SPX Cooling
Technologies. Cooling tower vendors who purchase commercial fans,
gear reducers, driveshafts, etc. may require that you deal directly with
those commercial suppliers for warranty satisfaction.
