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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 (below).  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 and Heater is
shown on Figure 2.

Heated Air

Blower

Water

with

Heat Load

Cold

Water

Heat

Exchanger

Cabinet

Cooled Air

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.

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.

In winter, if the cabinet temperature is below 75

°

F, the water solenoid

valve is closed. The heater thermostat keeps the cabinet temperature
between 40 and 60

°

F by turning the heater off and on. The limiter thermostat

has a set point of 180

°

F.

Limiter 

Thermostat

Heater 

Thermostat

Heater

Blower

Water Control

Thermostat

Solenoid Valve

Figure 2

Figure 1

Summary of Contents for KNHE28 Series

Page 1: ...AT EXCHANGER IT IS IMPORTANT THAT THIS MANUAL BE READ AND UNDERSTOOD THOROUGHLY KOOLTRONIC INC 30 Pennington Hopewell Road Pennington NJ 08534 609 466 3400 FAX 609 466 1114 www kooltronic com 900 046 15 7 20 CDR 20272 Find additional information on this model at kooltronic com or use the Technical Documents QR code below Technical Documents ...

Page 2: ... Introduction Kooltronic Heat Exchangers are designed to provide a cool environment for your electronic or electrical components There are models to fit virtually all sizes and shapes of electrical or electronic enclosures Our closed loop design also ensures that your components will not be exposed to hot dirty operating conditions This Manual provides you with the necessary general information fo...

Page 3: ...er until you read and thoroughly understand this Manual Before operating this unit all electrical wiring must be checked to assure the proper connections IV Product Identification and Nameplate Each Kooltronic Heat Exchanger includes an identification nameplate This nameplate provides CAUTION Operate this unit only on the proper voltages and frequencies as noted on the nameplate Model Number Seria...

Page 4: ...anger with options Automatic Water Flow Control and Heater is shown on Figure 2 Heated Air Blower Water with Heat Load Cold Water Heat Exchanger Cabinet Cooled Air 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 The Adjustable Water Control Ther...

Page 5: ...crews nuts washers 6 Attach overflow drain hose supplied to the drain exit at the bottom of the unit This hose must not be elevated above the exit port Improper mounting may impede the flow of condensate and may cause internal malfunctions 7 Attach supply line to 3 8 O D copper tubing Inlet on the side of unit 8 Attach discharge line to 3 8 O D copper tubing Outlet on the side of unit Mounting Pla...

Page 6: ...AT AIR FLOW SWITCH BLOCK TERM TSTAT CONT OPTIONS Wiring Diagram WD 394 NOTE Part Numbers shown are for 60Hz 1Ø For 50Hz consult Kooltronic Technical Data 60 Hz operation For 50 Hz operation consult Kooltronic Model Volts Power Amps Watts Maximum Inlet Water Temp ºF ºC Performance Watts ºF Watts ºC 1 GPM 2 GPM BTU H Watts 95ºF 35ºC Enclosure Air Temp 50ºF 10ºC Inlet Water Temp 1 GPM 2 GPM Approx We...

Page 7: ...ing of Major Component Replacements earlier in this manual VIII Packing Procedure Keep Heat Exchanger in proper upright position Pack Heat Exchanger in an appropriate carton preferably original carton if possible with adequate internal protective packaging making sure carton is marked properly For local controlled transportation strap carton where possible to a secure part of truck to prevent fall...

Page 8: ...s received by customer Number of parts to be returned Product description model and serial number Reason for return Action requested Contact name telephone FAX numbers and e mail address Pack unit in a suitable container for shipment preferably the original packaging if available All Heat Exchangers must be returned in an upright position properly secured to a pallet Improper packaging may void wa...

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