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KNHE28 Water-to-Air
Panel-Mounted Heat Exchangers

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Product
Information
TECHNICAL DATA

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Request
Quote
ModelVoltsPowerMaximum
Inlet
Water
Temp. °F
Performance
Watts/°F
(Air In)
BTU/H (Watts) @
95°F(35°C) Enclosure Air Temp.
50°F(10°C) Inlet Water Temp.
Approx
Weight
lbs.
(kg.)
Spare and
Replacement
Parts
AmpsWatts1GPM2GPM1GPM2GPM
Request RFQ linkKNHE281151.214085 (29)42506,449 (1,890)7,677 (2,250)44Order Parts
Request RFQ linkK2NHE282300.614085 (29)42506,449 (1,890)7,677 (2,250)44Order Parts
60 Hz. operation. For 50 Hz. operation, consult Kooltronic.

Click on image for larger view
KNHE28 Heat Exchanger photo
NEMA TYPE 4/4X
MAINTAINED

TECHNICAL DATA

Click to
Request
Quote:
Request RFQ linkRequest RFQ link
Model
Number:
KNHE28K2NHE28
Volts:115230
Power, Amps:1.20.6
Power, Watts:140140
Max Inlet Water
Temp. °F(°C):
85 (29)85 (29)
Perforamce, Watts/°F
(Air in), 1GPM:
42504250
Perforamce, Watts/°F
(Air in), 2GPM:
6,449 (1,890)6,449 (1,890)
BTU/H (Watts) @
95°F(35°C) Enclosure Air Temp.
50°F(10°C) Inlet Water Temp, 1GPM:
7,677 (2,250)7,677 (2,250)
BTU/H (Watts) @
95°F(35°C) Enclosure Air Temp.
50°F(10°C) Inlet Water Temp, 2GPM:
4444
Approx. Weight lbs.(kg.):Order PartsOrder Parts
Spare and Replacement Parts
60 Hz. operation. For 50 Hz. operation, consult Kooltronic.

STANDARD FEATURES

  • Click for more info.Closed-Loop Cooling
    • The enclosure interior airflow system is isolated from the ambient airflow or waterflow system. No ambient air can invade the cool, dehumidified sensitive component compartment.
  • Epoxy-Coated Heat Exchanger Coils
    • Heat Exchanger Coils are epoxy-coated. This coating will withstand 1000 hours of salt spray per the ASTM B 117 test method. Also see Stainless Steel Cabinet or Integrity NEMA 4/4X Air Conditioners. NOTE: Severe operational environments such as waste water treatment and salt spray are likely to cause corrosion failure over a period of time regardless of coating. Warranty: Corrosive conditions may affect the warranty coverage. Consult factory for warranty limitations in corrosive environments. NOTE: For additional corrosion protection options, contact factory.
  • Gasketed Flanges
  • NEMA 4/4X Rating Maintained (UL50)
    • All units are fully gasketed for tight, leakproof installation, in compliance with the NEMA 4 and 4X Enclosure Ratings.
  • Stainless Steel Shell
    • For applications in corrosive or other hostile environments such as those requiring Internal Corrosion Resistant Coatings, especially where chemical/moisture combinations are present.
  • UL/CUL Listed

ACCESSORIES AND OPTIONS

  • Automatic Water Flow Control
    • This control consists of a temperature control thermostat and a solenoid valve. When the temperature within the enclosure drops below the thermostat set point due to decreased load or decreasing water temperature, the thermostat closes the solenoid valve. When the temperature increases to the set point (plus a differential) the thermostat opens the solenoid valve and the supply water cools the enclosure. In most models the Automatic Water Flow Control also includes a bypass flow meter which allows a small amount of water (0.25 gpm) to pass through the heat exchanger at all times.
  • High Water Level Detector
    • Closes water-supply valve to prevent flooding if excess water accumulates in the drain pan. Signal circuit activates a user-supplied warning device. The low voltage power for the signal circuit is supplied by the user.
  • Internal Corrosion Protection - KNHE Series
    • This protection increases reliability in hostile environments. This protection for the cooling system consists of an air cured coating applied to the brazed joints, providing a degree of protection from corrosive environments. This coating will withstand 1000 hours of salt spray per the ASTM B 117 test method. NOTE: Severe operational environments such as wastewater treatment and salt spray are likely to cause corrosion failure over a period of time regardless of coating. This coating provides protection to the external portion of the coil and does not protect from any corrosive elements in the cooling water used internally. Warranty: Corrosive conditions may affect the warranty coverage. Consult factory for warranty limitations in corrosive environments. NOTE: For additional corrosion protection options, contact factory.
  • Low Airflow Detector
    • Similar to the Airflow Switch shown in the Blower Accessories Section, the switch is installed in a suitable location in the air conditioner to detect loss of airflow, and sends a signal to a terminal block, through which user-installed wiring and warning devices are activated.
  • Other voltages and frequencies
  • Special materials or finishes
  • Special motors, line cords or connectors
  • Temperature Alarm
    • A thermostat is mounted inside the cabinet and attached to a sensor in the warm air return. When the air temperature increases to the set point, a signal is sent to a terminal block. User-installed wiring from the terminal block to local and/or remote warning devices (light, bell, siren, etc.) can be for normally open or closed operation.

AIRFLOW
Click on image for larger view

KNHE28 Heat Exchanger isometric illustration

PERFORMANCE

KNHE28 Heat Exchanger performance chart

GENERAL ARRANGEMENT
Click on image for larger view

KNHE28 Heat Exchanger general arrangement drawing
GENERAL ARRANGEMENT
Click on image for larger view

KNHE28 Heat Exchanger general arrangement drawing

Many popular units are available as 3D solid models for customer system integration. Contact Kooltronic for details.
HOW TO ORDER
Specify model number. For 230 VAC operation, add a 2 after the K. Example: K2NHE28.

SIMILAR MODELS

ModelGuideline
Dimensions
(H x W x D)*
Watts/°F
KNHE2020.00 x 10.14 x 4.3120
KNHE2424.00 x 10.50 x 7.5633
KNHE3030.00 x 12.50 x 10.9558
KNHE3232.00 x 15.50 x 11.0480
KNHE4848.00 x 20.26 x 9.3290
KNHE6061.87 x 20.26 x 9.37100
*See model specifics for drawings, dimensions, mounting or cutout plans.

DOCUMENTS

  • Data Sheet
    KNHE28 Product Data Sheet [65Kb]
  • GA Drawing
    KNHE28 General Arrangement Drawing [49Kb]
  • Installation Instructions
    KNHE28 Installation Instructions (2 pages) [109Kb]
  • Literature
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    Increasing the Lifespan and Reliability of Electrical Components [212Kb]
    Kooltronic Custom Capabilities Flyer [2194Kb]
    Kooltronic Custom Cooling Medical Flyer [211Kb]
    Kooltronic Design Guide/Catalog (220 pages) [229400Kb]
    Kooltronic Refrigeration System Manufacturing [55Kb]
    Kooltronic Standard Warranty [55Kb]
    Kooltronic Unit Longevity Press Release [167Kb]
    NEMA Enclosure Ratings [91Kb]
    Short-Form Catalog (16 pages) [897Kb]
    Airflow Switch Data Sheet [159Kb]
    Heat Exchanger Quick-Sheet [90Kb]
    Laboratory Environmental Testing Services [157Kb]
    Powder Paint Application Facilities Flyer [165Kb]
  • Operator's Manual
    KLLC100 Lead-Lag Controller [38Kb]
    KLLC480 Lead-Lag Controller [79Kb]
    KNHE28 Operator's Manual [147Kb]
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