4
V. Principles of Operation
If ambient air cannot be utilized directly as a
cooling medium, another cost-effective
method of cooling is a Water-to-Air system
(Figure 1). Water is used to remove heat
from the air circulated within the electronics
enclosure.
Cooling water is circulated through a tube-
and-fin coil. As the heat-laden air circulates
through the coil, the heat is absorbed by the
water and carried away, in a continuous
process.
Water-to-Air systems are easy to install and
usually require minimum maintenance. The
water used must be reasonably clean and
cold enough to ensure proper operation of
the cooling system under the most severe
anticipated conditions. In some cases, if
sufficiently cold water is available, below-
ambient-temperature cooling can be
achieved.
The Heat Exchanger with options --
Automatic Water Flow Control is shown on
Figure 2.
Heated Air
Ca
b
inet
Cooled Air
Water With
Heat Load
Cold
Water
Heat
Exchanger
Blower
WATER-TO-AIR
A Water-to-Air Heat Exchanger works by transferring heat of internal
air to circulating water, resulting in chilled air which is recirculated
throughout the electronics or electrical cabinet.
Water Control
Thermostat
Water With
Heat Load
Cold
Water
Heat
Exchanger
Blower
Cooled
Air
Heated
Air
Solenoid
Valve
Water
Control
Regulator
Figure 2
Figure 1
The Adjustable Water Control Thermostat opens and closes a water solenoid
valve based on the set point and differential settings. A temperature sensor is
located in the airstream of the cabinet. The Adjustable Water Control
Thermostat has a factory set point of 75
°
F.
VI. Specific Model Data
Mounting
The Kooltronic Water-To-Air Heat Exchangers have been engineered to be installed easily. These units utilize
double layer gaskets. The first gasket layer is placed on the outside perimeter of the front panel that is sealed
against the customer enclosure. The second layer is placed on the two cutouts in the front panel. The first gasket
layer will allow a small amount of water between the two layers. The second gasket layer totally protects an
enclosure from ambient air, rain or hose down water. This gasket arrangement assures the integrity of the closed
loop system and is necessary to maintain the NEMA 4 rating.
Prior to mounting, refer to the mounting drawing showing dimensions and locations of mounting holes and cutouts.
Prior to cutting or drilling, make sure that cutouts and mounting holes do not interfere with components inside the
cabinet. To avoid damaging your air conditioner, please read the following information before installation:
