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Circulation chillers for variable use in laboratory, mini-plant and production for temperatures from -20 up to 40 °C

The LAUDA Variocool circulation chillers offer a broad performance spectrum for demanding temperature control tasks. The color TFT screen makes operation easy. A USB interface and an alarm contact are integrated as standard features. Additional interfaces are available as accessories. They are located in the front of the device, which means they are easy to access.

The circulation chillers with their multitude of options are very well suited to a number of different areas of application. Optional pumps, for example, enable higher supply pressure. Optional heating units, which are adapted to the cooling capacity, enable the quick heating of the connected application when needed.

Application examples

  • Central cooling water supply in laboratories
  • Cooling of analytical devices
  • Temperature control of bioreactors
  • Supply to cooling traps

Download a PDF of our Variocool brochure:

LAUDA Variocool Brochure

Working Temp Min.

Working temperature min.

-20 °C

Working Temp Max.

Working temperature max.

40 °C

Color TFT display and membrane keypad offer simple and easy adjustment options
Standard USB interface and alarm contact as well as additional optional interfaces that can be retrofitted

3 models in air or water-cooled design with cooling capacities from 600 W up to 10 kW – the appropriate solution to every requirement


All models with electronic expansion valve – good temperature control and cost savings thanks to reduced energy consumption


Due to their compact design, units up to 2 kW of cooling capacity can be placed under the laboratory table – saves valuable lab space


Display and operation via color TFT screen and membrane keyboard – easy and clear setup options


Electronic fill gauge on the display and low level alarm when fluid level too low – early detection of insufficient fluid


Options for flexible customization to applications:
– high power pumps
– heaters
– flow control
– outdoor installation
– use with DI water
– noise reduction


USB interface and alarm contact standard features in the front of the device – easy accessibility


Retrofittable interfaces as accessory:
– analog module
– RS-232/485 interface
– contact modules
– profibus module
– Pt100/LiBus module


Front grid can be easily removed without tool – easy to clean condenser


Tower design for larger models (from VC 7000) – space-saving setup


Microchannel condensers in all air-cooled models – reduced footprint and lower refrigerant quantity


All models (except VC 600) with adjustable bypass and pressure gauge – connection of pressure sensitive applications

Variocool Circulation chillers with cooling capacities up to 2 kW

Variocool circulation chillers function in an operating temperature range of -20 to 40 °C. Optional heaters can be added to increase the maximum temperature to 80 °C. For greater pressure requirements, optional pumps are available with the VC 1200 version or higher. With the exception of the VC 600, all models are also available as water-cooled versions. All devices are equipped with lockable casters. The compact dimensions of the models from VC 600 to VC 2000 (W) allows to place them under the laboratory table.

Variocool Circulation chillers with cooling capacities up to 5 kW

The models VC 3000 and VC 5000 offer cooling capacities of 3 and 5 kW. They are also available in water-cooled design (W). For flexible adaption to different applications the chillers can also be delivered with optional high-power pumps or heaters. Further options are a flow control, outdoor-installation or a noise reduction for the types VC 5000 and VC 5000 W.

Variocool Circulation chillers with cooling capacities up to 10 kW

The highly efficient tower design circulation chillers provide cooling capacities between 7 and 10 kW. Options like heating or high-power pumps add to the devices‘ areas of application. The models are available in air or water-cooled design. All models are equipped with casters which can be controlled and locked.

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Variocool Circulation Chillers

Technical features VC 600 VC 1200 VC 1200 W VC 2000 VC 2000 W VC 3000 VC 3000 W VC 5000 VC 5000 W VC 7000 VC 7000 W VC 10000 VC 10000 W
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Working temperature min. °C -20 -20 -20 -20 -20 -20 -20 -20 -20 -20 -20 -20 -20
Working temperature max. °C 80 80 80 80 80 80 80 80 80 80 80 80 80
Bath volume min. L 4.0 8.0 8.0 8.0 8.0 20.0 20.0 20.0 20.0 48.0 48.0 48.0 48.0
Temperature stability ±K 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.10 0.10 0.10 0.10
Pump pressure max. bar 0.9 0.9 0.9 0.9 0.9 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2
Pump flow max. L/min 28 28 28 28 28 37 37 37 37 37 37 37 37
Cat. No. 115 V; 60 Hz L000683
Cat. No. 208-220 V; 60 Hz L000685 LWG 882 L000686 LWG 883 L000687 LWG 884
Cat. No. 208-220 V; 3/PE; 60 Hz L000728 L000746 L000689 L000695 L000690 L000696
Cat. No. 220 V; 60 Hz LWG 275

Cooling water tubing, EPDM
Temperature range from -40…100 °C and pressure range max. 20 bar

Cat. No. Description di (mm) de (mm)
RKJ 031 EPDM tubing, fiber-reinforced 13 19
RKJ 032 EPDM tubing, fiber-reinforced 19 27
RKJ 033 EPDM tubing, fiber-reinforced 25 34

Polymer tubing
EPDM tubing

Cat. No. di (mm) Temperature range °C
RKJ 111 9 10…90
RKJ 112 12 10…90

Tube clips, stainless steel
To secure tubings

Cat. No. Description
EZS 032 Tube clip 16-27 mm, 1/2″ external Ø

di = internal diameter; de = external diameter

Heat transfer liquids

Designation Temperature range Cat. No. 5 L Cat. No. 10 L Cat. No. 20 L
Aqua 90 5…90 °C LZB 120 LZB 220 LZB 320
Kryo 30 -30…90 °C LZB 109 LZB 209 LZB 309

Interface modules

Cat. No. Description
LRZ 912 Analog module, 2 x In, 2 x Out, 0(4)…20 mA or 0…10 V
LRZ 913 RS 232/485 interface, electrically isolated, 9-pin SUB-D
LRZ 914 Contact module NAMUR, 1 x In, 1 x Out, NE 28, 2 DIN sockets
LRZ 915 Contact module SUB-D, 3 x In, 3 x Out, 15-pin SUB-D
LRZ 917 Profibus interface, electrically isolated, 9-pin SUB-D
LRZ 918 Pt100/LiBus module