Door Monitoring; Compressor Monitoring; Condensor Monitoring - Gram SF 930 Bedienungsanweisung

for setting a higher temperature or longer time.
for setting a lower temperature or shorter time.
P is released, the new setting is stored.
When
NOTE: The time or temperature setting can be changed during the program
sequence for time and temperature-controlled freezing as follows:
First press one of the program keys
Time and temperature can now be set as described above. The program key
concerned must then be pressed again. The red LED will then light up continuously.
Memory.
All settings are stored in the control memory, until new values are entered. Therefore,
the same program can be repeated without reprogramming.

Door monitoring

To minimise cold loss, the evaporator fan is stopped each time the door is opened
and a monitoring time of 3 minutes begins. If the door is not closed during this time
interval, the compressor stops. If the compressor does not start immediately after the
door is closed, the reason might be that the protection system built into the
compressor control is preventing the compressor being started too quickly. See
section on compressor monitoring.

Compressor monitoring

To protect the compressor and associated relays against overload - and in this way
prolong the life of these components - the control ensures that a minimum time of
about 3 minutes must elapse before a stopped compressor can be started again.
In cabinets with two compressors, the start-up of compressor 2 is delayed about 1
minute in relation to compressor 1. Compressor 2 stops about 3 seconds after
compressor 1.
Condenser monitoring
If one of the condensers becomes too hot, the associated compressor stops. At the
same time, the red LED on the left of the display lights up.
When the condenser has cooled down, the LED goes out and the compressor starts
again.
If this sequence repeats itself four times, the LED flashes all the time and the
compressor will not start again.
76-504-0970
. The red LED will flash.
20/GB