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MC
Marley
Specifications
take the above water quality and load
carrying capabilities into account in the
selection of their materials of manufac-
ture.
7.0
Mechanical Equipment:
7.1
Fan(s) shall be forward curved cen-
trifugal-type, which are statically and
dynamically balanced. The fan impeller
is manufactured from galvanized steel,
blades are riveted to the center plate
and inlet rings and have stay rods to
ensure maximum concentricity and
rigidity. The stay rods are adjusted by
the manufacturer during the balancing
operation and require no field adjust-
ment. Fan(s) shall be driven through
one-piece, multi-groove, V-belt, pulleys,
and spherical roller bearings. Bearings
shall be rated at an L
hours, or greater. A hinged motor
adjustment plate with threaded ten-
sioning bolts shall be installed to allow
correct belt tensioning.
7.2
Motor(s) shall be ____ kW maximum,
Totally Enclosed, 1.15 service fac-
tor, variable torque, and specially
insulated for fluid cooler duty. Speed
and electrical characteristics shall be
______ RPM, single-winding, 3 phase,
50 hertz, ____ volts. Motor shall oper-
ate in the shaft-horizontal position and
nameplate kW shall not be exceeded
at design operation
7.3
The complete mechanical equipment
assembly for each cell shall be sup-
ported by a rigid, galvanized steel
structural support that resists misalign-
ment between the motor and sheaves.
The mechanical equipment assembly
shall be warranted against any failure
caused by defects in materials and
workmanship for no less than five (5)
years following the date of fluid cooler
shipment. This warranty is limited to
the fan, fan shaft, bearings, sheaves
and mechanical equipment support.
The motor, motor components and
belt(s) are warranted by their manufac-
turer.
/
Specifications: Base
Fluid Cooler
life of 50,000
10
Specification Value
The Marley drive system features all-aluminum sheaves (pulleys),
■
power band belts, and long-life bearings for dependable service.
To reduce cost, some manufacturers may use TEAO motors, whose
only source of cooling is the flow of air produced by the fluid cooler
fan. They are sometimes applied at kWs significantly beyond their
nameplate rating.
Unless otherwise specified, motor speed will be 1500 RPM, 50 Hertz
on standard models. 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.
The value of a 5 year mechanical equipment warranty speaks for
itself.
18
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