Specifications

Specifications
Specification Value
MH Fluid Cooler — Specifications: Options
24
Miscellaneous Options
Positive Closure Dampers:
4.2 Add the following paragraph in the Coil
section: Provide positive closure actuat-
ing dampers to prevent air from flowing
through the coil section when the damp-
ers are closed. All linkage and axles shall
be stainless steel and the blade bear-
ings shall be corrosion resistant, molded
synthetic bearings. Damper blades shall
be single-skin constructed from G60
galvanized steel. Damper frame shall also
be manufactured from G60 galvanized
steel. Damper actuators shall be either
pneumatic or electric depending on cus-
tomer’s preference. Dampers shall be field
installed and actuators shall be wired by
others.
Motor Out of the Airstream:
MHF706 and MHF707 models only
with gear drive option.
7. 1 Add the following to the end of para-
graph 7.1: The motor shall be mounted
outside the casing of the fluid cooler and
shall be connected to the gear reducer
by a dynamically-balanced, stainless steel
tube and flange drive shaft.
High Temperature Fill:
8.1 Replace paragraph 8.1 with the fol-
lowing: Replace paragraph 8.1 with
the following: Fill shall be film-type,
thermoformed of 20 mil thick high-tem-
perature PVC, with louvers and elimina-
tors formed integrally in each fill sheet.
Fill shall be suspended from stainless
steel structural tubing supported from the
fluid cooler structure. The air inlet face(s)
of the fluid cooler shall be free of water
splashout.
■ Positive closure dampers give you the added security of safe operation in freez-
ing weather. Heat loss data from the coil can be obtained by accessing the
Marley UPDATE web-based selection software at spxcooling.com.
Pneumatic damper actuators are UL approved, totally enclosed with spring
return actuators. Electric actuators are industrial grade, NEMA 4 rated, 2-posi-
tion drive both ways. The damper section protrudes from the louver face a mini-
mum of 6".
■ For many years, a feature of Marley cooling towers was that the electric motors
were located outside the fan cylinders, where they were easily accessible, and
where they were not subjected to the constant humidity that exists inside the
tower plenum.
Although improved motor designs (insulation, bearings, seals, and lubricants)
have now made it feasible for us to locate the motor inside in close-coupled
proximity to the Geareducer, many users still prefer the motor to be located
outside the humid airstream. If you are among those users—or are among those
who see the wisdom of their thinking—please specify this option.
■ For process fluid above 135°F.