3
* Fan control settings
The
ALFANET 95
has various adjustment possibilities for the Fan. Normally, the fan is always running
unless one of the parameters below is set at 1:
Parameter 20 = 1:
Fan switch differential active.
The fan runs only if the temperature of the defrost sensor is lower than the control sensor
temperature minus the temperature of the switch differential fan (P21)
{Fan on if T
defrost
< (T
control
- T
fandiff.
)}.
Parameter 25,26:
Fan switching on delay after defrosting.
To prevent the fan from running immediately after defrosting and draining of the evaporator and
thus blowing warm air into the cell, the following two conditions can be set;
a. The fan is blocked until the defrost-sensor measures a temperature that is lower than the set
switch-on temperature of the fan (P25).
b. The fan is blocked until the switch-on delay of the fan (P26) is passed. When the defrost-
sensor reaches the switch-on temperature (P25) within the switch-on delay, then the fan is
released again.
Parameter 22 = 1:
Fan is off, when the compressor is off.
The fan is turned off if the compressor is off. This happens with a delay of parameter 23.
* Defrost control possibilities.
The automatic defrost is started on a real-time (P60) clock basis and stops after the maximal defrost
time (P30), or earlier if the defrost sensor has reached the set defrost-end-temperature (P31). The
ALFANET 95
has a number of automatic defrost possibilities that can be set with the following
parameters;
Parameter 24 Type of defrost:
The
ALFANET 95
has three possibilities for defrosting;
P24 = 0 At defrost only the relay FAN is switched on (natural defrosting).
P24 = 1 At defrost only the relay DEFR. is switched on (hot gas / electrical defrosting).
P24 = 2 At defrost the DEFR. and the FAN relays are both switched on (hot gas/elefan
defrosting).
Parameter 60 = 1 Defrosting on the real-time clock
Here, the defrosting is started at fixed times (P61 up to and including P72).
* Adjusting the sensor.
The
control sensor
can be adjusted by means of the Offset control sensor parameter 05.
The
defrost sensors
can be adjusted by means of the Offset defrost sensor parameters 08 and 11.
For readout the temperature of the defrost sensors choose parameters 07 and 10.
Should a sensor of the
ALFANET 95
indicates 2
/
C too much, for example. Then the according Sensor
Offset must be lowered by 2
/
C.
* Operation of the Alarm.
When there is an error or an alarm, a error code message appears in the display. The
ALFANET 95
remembers this error message, even if the problem has already been solved.
The error message can be reset with the
SET
key.
If, after pressing the
SET
key (=reset alarm) the alarm is not yet resolved, then the
ALFANET 95
shows the temperature and error code alternately, if the alarm has been resolved then the error code
disappears and the temperature is shown again.
