Marley
/
MH
Fluid Cooler
/
Specifications: Options
Specifications
Specification Value
21
Variable Speed Drive:
6.4
Add the following paragraph in the
Mechanical Equipment section:
The
fluid cooler shall be equipped with a
UL 508 control system in a NEMA 12
indoor or NEMA 3R outdoor enclo-
sure capable of controlling motors as
required, and designed specifically for
fluid cooler applications. The panel
shall include a main circuit breaker
disconnect with an external operat-
ing handle, lockable in the off position
for safety and solid state temperature
controller. Door mounted selector
switches shall be provided to enable
automatic or manual control and wired
for 120VAC control. Control circuit
to be wired out to terminal blocks for
field connection to remote vibration
switches. The temperature controller
shall be adjustable for the required
process temperature. The temperature
controller will display two tempera-
tures, one for process temperature and
the other for set point. . Water tem-
perature input shall be obtained using a
thermal sensing device on the process
coil and wired back to the solid state
temperature controller in the VFD con-
trol panel.
Miscellaneous Options
Positive Closure Dampers
4.2
Add the following paragraph in the
Coil section:
Provide positive closure
actuating dampers to prevent air from
flowing through the coil section when
the dampers are closed. All linkage
and axles shall be stainless steel and
the blade bearings 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
customer's preference. Dampers shall
be field installed and actuators shall be
wired by others.
Q
Marley VFD drive systems are
designed to combine absolute
temperature control with ideal
energy management. The fluid
cooler user selects a cold water
temperature and the drive
system will vary the fan speed
to maintain that temperature.
Precise temperature control is
accomplished with far less stress
to the mechanical equipment
components. The improved
energy management provides
fast payback.
Q
Positive closure dampers give you the added security of safe
operation in freezing weather. Heat loss data from the coil can be
obtained through UPDATE, Marley's web-based selection soft-
ware.
Pneumatic damper actuators are UL approved, totally enclosed
with spring return actuators. Electric actuators are industrial
grade, NEMA 4 rated, 2-position drive both ways. The damper
section protrudes from the louver face a minimum of 6".
MULTICHILL Refrigeration Products
SPX Cooling Technologies - Marley Cooling Towers
Cooke Industries - Phone: +64-9-579 2185 Fax: +64-9-579 2181 Email: [email protected] Web: www.cookeindustries.co.nz
