Lauda MC 250, Operating Instructions Manual, Page: 19 / 72

3.4 Function elements
3.4.1 LEDs for function display
Fig. 7: LEDs
1 Yellow LED
2 Blue refrigeration LED
3 Red error LED
Each device has three LEDs with the following functions:
 The yellow glycol LED lights if Kryo 30 is necessary as heat
transfer liquid.
 The blue refrigeration LED indicates whether the refrigeration
unit is active.

The red error LED lights in the event of device faults.
3.4.2 Hydraulic circuit
The hydraulic circuit designates the circuit through which the heat
transfer liquid flows.
The circuit basically consists of the following components:
 internal storage bath with heat transfer liquid
 pump for conveying the heat transfer liquid into the external
consumer via the pump connections
 Starting with MC 600, devices are equipped with an adjustable
bypass to be able to adapt the pump pressure to the require-
ments of the external consumer.
Hydraulic circuit
Design and function
Microcool 19