36
8.5
S
YSTEM
B
O
SS
The BoSS system ensures that the freezer will operate in case of a board (PCB) malfunction or 24 V outage,
provided
that the mains supply is present
. The compressors are then powered permanently, without any temperature monitoring.
The temperature will fall to the lowest possible one.
Your samples are thus safe, with no risk of a temperature rise.
Principle:
1.
If the 24 V supply to the regulator is cut off due to a fault on the circuit board, the regulator is powered by the
24 V batteries, the alarm light is not lit and the freezer operates normally, powered by the backup batteries.
The BoSS led is activated.
2.
When battery voltage drops to 20 Volts (±2 V) or if the controller does not activate its heartbeat signal, the BoSS
system is triggered, the alarm indicator and buzzer on the freezer front panel are triggered and the regulator
display is lit. The compressors are directly connected to the 230 V supply, the temperature monitoring is no
longer active.
3.
The temperature in the freezer falls to the lowest possible and could reach –90°C ±2°C.
4.
After 40 hours (±1 hour), the regulator display stops. The compressors remain in continuous operation with no
regulation, and the alarm indicator is not lit.
The freezer can operate under the BoSS system for several days or weeks without any problem. However, Froilabo’s
service department should be contacted to schedule a repair.
WARNING:
THESE SPECIFICATIONS WERE OBTAINED USING NEW BATTERIES CHARGED FOR AT LEAST 24
HOURS.
