Specifications

Specifications
Specification Value
MH Fluid Cooler — Specifications: Options
19
Control Options
Combination Fan and Pump Motor
Starter Control Panel:
6.4
Add the following paragraph in the
Mechanical Equipment section: Each cell of
the fluid cooler shall be equipped with a UL
/ CUL 508 listed control panel in a NEMA
3R outdoor enclosure designed specifically
for fluid cooler applications. The panel shall
include a main thermal magnetic circuit
breaker disconnect with an external operat-
ing handle, lockable in the off position for
safety. For fan operation use a full voltage
non-reversing magnetic starter controlled
with a solid-state temperature controller. For
spray pump operation use a full voltage non-
reversing magnetic starter with manual ON
and OFF control via a door mounted selector
switch. The solid-state device for fan control
will display two temperatures, one for outgo-
ing water and the other for set point tem-
perature. Water temperature input shall be
obtained using a three-wire RTD with dry-well
located in the field outlet water piping. Dry
status contacts wired to user terminal points
indicating typical alarm and status events
shall be provided. Two safety circuits for the
spray pump, low water cut off preventing a
dry run pump and a pump shut down upon
approaching freezing temperatures in the
cold water basin shall be provided.
Available options: Water level control with
various combinations of make-up, high alarm,
low alarm, high cut off and low cutoff events.
Basin heater controller with low water cutout.
Spray pump heat trace circuit. Power and
control for damper actuator motor.
Pump Motor Starter Control Panel:
(used when a VFD controls the fan)
6.4
Add the following paragraph in the
Mechanical Equipment section: Each cell of
the fluid cooler shall be equipped with a UL
/ CUL 508 listed control panel in a NEMA
3R outdoor enclosure designed specifically
for fluid cooler applications. The panel shall
include a main thermal magnetic circuit
breaker disconnect with an external operating
handle, lockable in the off position for safety.
For spray pump operation use of a full volt-
age non-reversing magnetic starter with man-
ual ON and OFF control via a door mounted
■ If it is your opinion that the control system for the fluid cooler be part of the fluid
cooler manufacturer’s responsibility, we are in wholehearted agreement with
you. Who better to determine the most efficient mode and manner of a fluid
cooler’s operation—and to apply a system most compatible with it—than the
designer and manufacturer of the fluid cooler?
Marley variable speed drives are also available for the ultimate in temperature
control, energy management, and mechanical equipment longevity.