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Evaporative Cooling Optimizer
Water Wizard™
Maximize Cooling and Reduce Water Waste
April
2006
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Water Wizard
Evaporative Cooling Optimizer
Cooling with the Wizard
reenheck’s Water Wizard provides complete evaporative cooling control. The Wizard measures the outside
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temperature and humidity then adjusts the water supply to provide only the water needed for maximum
evaporative cooling. On cool or humid days, the Wizard knows the evaporative cooling potential is low and
educes the water supply to save you money. On hot or dry days, the Wizard increases the water supply to
r
meet the increased evaporative cooling potential, providing you with the most cooling possible.
Water Wizard Features
Freeze Protection
The Wizard protects the evaporative cooler from
freeze damage by automatically shutting off the water
and draining the supply line when the outside air
temperature approaches freezing.
User Friendly Interface
Four control keys and a large LED display provide a
simple and user friendly interface.
Optimum Evaporative Cooling
Water
Supply
Easy and Accurate Set-Up
Factory provided pressure gauge and manual supply
valve are standard, allowing the optimum water
pressure to be quickly and accurately dialed in for
peak performance.
Field Adjustable
The factory default settings are easily adjustable,
allowing you to maximize your cooling and savings.
Optimum Evaporative Cooling
The Water Wizard guarantees you the optimum
evaporative cooling cycle for your conditions.
1. Warm air enters the media.
2. Water evaporates and the airstream cools.
3. Cool air discharges from the moist media and the
water supply replaces the water that was
evaporated.
1 2 3
1.9 GPM
2.5 GPM
3.0 GPM
* Calculated at 48,000 CFM with a 90% efficient evaporative cooler.
B
A
C
Varying Humidities
Even in the best evaporative cooling climates, the
evaporative cooling potential can vary greatly from
day to day. With the Wizard, you can always be sure
your evaporative cooler is optimized – on a dry or
humid day. Consider the following example at a
95ºF Td*.
A. On a day with a 67ºF T
GPM of water and maximum cooling.
B. On a day with a 73ºF Tw, the Wizard reduces the
water supply to 1.9 GPM, saving you water while
oviding the maximum cooling.
still pr
C. On a day with a 60ºF Tw, the Wizard increases
the water supply to 3.0 GPM and provides you
with the maximum evaporative cooling.
, the Wizard pr
w
ovides 2.5
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Other Evaporative Optimizers
Without the Water Wizard, you are limited to a dry bulb system. While dry bulb systems adjust the water supply
ith the outside air temperature, they have one major fault that limits their performance: they don’t consider the
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outside air humidity. This results in many hours of operation where the cooling system is either wasting water or
providing less than optimal cooling.
Water Waste
On humid days, the dry bulb system will supply too
much water, resulting in water waste and increased
operational costs. See point A on graph below.
1. Warm, humid air enters the media.
2. Water evaporates and the airstream cools.
3. The water supply provides more water than what
is evaporated, water drains from the
supersaturated media and is wasted.
Water Supply
Water Waste
Undercooling
On dry days, the dry bulb system will not supply
enough water and the media will dry out, resulting in
undercooling and reduced media life. See point B on
graph below.
1. Warm, dry air enters the media.
2. Airstream is cooled until all of the water
evaporates.
3. Dry media represents missed cooling opportunity.
Water Supply
1 2 3
Cooling with a Dry Bulb System
With a dry bulb system, the water flow rate is
adjustable but will typically be set in the field and
e, with the water supply
then left alone. Ther
emaining constant, changes in humidity go
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unnoticed. Consider the following example where
48,000 cfm is being supplied thr
evaporative cooler. The water flow rate of 2.5 GPM
was established based on optimization at 67ºF T
A. On a day with a 73ºF Tw, where the humidity level
is higher than the 67ºF Tw optimization, the dry
bulb system will supply 2.5 GPM of water when
only 1.9 GPM is required for maximum cooling.
esults in a 32% water waste.
This r
B. On a day with a 60ºF Tw, where the humidity level
is lower than the 67ºF Twoptimization, the dry
bulb system will provide 2.5 GPM of water when
3.0 GPM is required for maximum cooling. This
results in a missed opportunity to provide
additional cooling for the space.
efor
ough a 90% ef
ficient
.
w
1 2 3
W
ater
Waste
2.5 GPM
Undercooling
2.5 GPM
A
B
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Specification
Operation
he Water Wizard shall control a supply solenoid to
T
adjust the water supply to the evaporative cooler
ased on the outside air dry bulb and wet bulb
b
temperatures. The Water Wizard shall increase the
water supply on days with a high evaporative
cooling potential and decrease the water supply on
days with a low evaporative cooling potential. The
Water Wizard shall respond to a change in both
temperature and humidity.
Freeze Protection
The Water Wizard shall be equipped with a freeze
protection function. The freeze protection shall
shut off the water supply and drain the supply line
if the temperature falls below the field adjustable
freeze temperature setting for longer than the field
adjustable freeze protection time delay setting.
Programming
The Water Wizard shall be pre-programmed at the
factory and have field adjustable set points.
Components
he Water Wizard shall include at
T
least one manual shut-off valve
nd pressure gauge factory
a
installed in the evaporative
cooler. The Water Wizard shall
include a four key user interface
with three-digit LED display
which shall be factory mounted in
the control center of the make-up
air unit. The Water Wizard shall
include temperature sensors for
measuring the dry bulb and wet
bulb temperatures. The sensors
shall be factory mounted when
the evaporative cooler ships
attached to the fan section. Solenoids may be
supplied by Greenheck (if selected) or by others.
Installation, piping and wiring of the solenoids shall
be the responsibility of the contractor.
Our Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the purchase date.
Any units or parts which prove defective during the warranty period will be replaced at our option when returned to our factory,
transportation prepaid. Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by Greenheck
prove defective during this period,
responsible for any removal or installation costs.
As a result of our commitment to continuous improvement,
they should be returned to the nearest authorized motor ser
Greenheck reser
vice station.
ves the right to change specifications without notice.
Greenheck will not be
Greenheck P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com
Copyright © 2006 Greenheck Fan Corp. • Water Wizard Rev. 2 April 2006 RG
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