For more than 60 years products from our house ensure the right temperatures. Through path- breaking developments in the field of refrigeration and air- conditioning engineering we have gained worldwide recognition.

Our product range covers unit air coolers, fan coils and finned heat exchangers. We only produce at our company located in Gerlingen near Stuttgart.

Fan Coil Units
Air Coolers
Heat Exchangers

The latest addition to the HKN series is the compact HKN/D 10- 50 EC. The smallest model of the series has only dimensions of 750x135x615 mm, but is able to achive a heating capacity up to 2 kW. The EC fan drive isn't only energy efficient but also quiet as a whisper.

The HKN unit can replace common radiators to lower the flow temperatures and thus save energy. The unit is also very fast, when a room has to be heated up in short time.

Standard design

  • Fan wired to terminals
  • One heat exchanger, chooseable:
    • 2 lines water heat exchanger
    • direct expansion evaporator for refrigerants

Ceiling- mounted and floor- mounted appliance

Ceiling- mounted and floor- mounted appliance of HKN 10- 50 series differ only in the position of the outer drain pan. A HKND unit can simply be altered to an HKN unit by exchanging the small drain pans with a few screws.

Heat exchangers

HKN 20 heat exchangerTwo heat exchangers can be installed inside the HKN/D 10- 50. The basic unit is preferably for cooling the smaller one on top for heating.

Both heat exchangers are optimised to achieve high thermal capacities. Due to the compact design of the unit natural convection ist promoted in heating applications.

The routing of the air flow through the heat exchangers has been examined to ensure an straight and uniform air distribution inside the heat exchangers.

The small coil on top can be retrofitted.

Cross flow fan

HKN cross flowThe complete motor and fan wheel combination was developed to meet the requirements of the HKN unit. Silence and energy efficiency are the leading points when designing a fan of a fan coil unit.

The fan can be connected to 220 - 240 V 50/ 60 Hz and its maximum input is at 38 W. The motors r.p.m. are controllable by a 0- 10 V signal. Common 3 stepped controls can be adapted by an additional circuit board.

The cross flow wheel got a special design for a silent air movement.

Air filter

HKN filterThe air filter is made of polyurethan and washable. Due to its impelentation into a filter a frame it can easily be exchanged or removed for cleaning purposes. The filter can't be classified in filter classes according to EN 779. 


The housing is available in two colors: white (similar RAL 9010) and light- grey (RAL 7035). Other colors are available on request. Optional there are:

  • Detachable side parts
  • Rear or back cover plates

Condensate pump

Our standard condensate pump is designed for a maximum of 2 m height difference and 10 m tube length. Power input: 14 W, sound pressure < 20 dB(A) in 1 m.

Protection against corrosion

For fan coils we can provide two types of protection against corrosion:

  • Protection against corrosion type G
    Prelaquered fins, tin coated copper tubes, side parts of heat exchanger laquered with 2 component lacquer
  • Protection against corrosion type E
    Copper/ copper heat exchanger with antimicrobial benefits.