Special safety function – Liebherr WKt 4552 GrandCru User Manual
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Special safety function
Electro-mechanical + 2 °C safety thermostat for laboratory refrigerators with Comfort-Controller
In order to ensure maximum reliability, the Comfort-Controller has a heavy-duty compressor relay thus
reducing the possibility of burned relay contacts. Should however a defect occur, an additional safety ther-
mostat backs up the controller to prevent the product temperature from dropping below +2 °C.
LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
Internal alarm memory
This function stores to memory details of the last three temperature and power failure alarms. Time and
date of the start and the duration of the alarm conditions are registered.
Min. / max. temperature memory
After reaching the set temperature for the first time, the Comfort controller begins continuously to store
to memory the highest and lowest internal temperatures registered. These minimum and maximum
temperatures can be read out from the memory. After reading the min/max memory, the values can either be
reset or left in the memory. Normally the values would be noted by the user and the memory reset in order
to define the next period to be registered. The controller also registers the time elapsed since the last reset
up to a period of ~ 40 days.
Internal memory functions
Min
Max
+ 2 °C