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4. DESCRIPTION OF THE COOLING SEGMENT OPERATION CYCLE.
At the moment of connecting to the mains and starting with the button, the controller – after
the delay set in the dE parameter – goes to the control phase.
The controller controls two control circuits:
control circuit for the chiller unit or heating circuit;
control circuit for motoreducer of the stirrer or ventilator.
The work for the control settings of the refrigeration system will be discussed below.
ATTENTION
The dE parameter is the delay of switching on the chiller and the stirrer after switching on the
controller or after power supply failure – factory setting is 5 s.
4.1. Control of the chiller unit.
The control temperature value (in the range specified in the parameters b1 and b2) is set by pressing
the buttons marked with the symbols
▲
and
▼
. A short press of any of these buttons displays
the currently set value, while the next pressing causes the change of this value. Moving from reading
the measured temperature to the reading of the set control temperature is signaled by the flashing
of digits / numbers.
The chiller control in the cooling phase takes place depending on the temperature present
in a refrigeration chamber. The controller can control the cooling temperature in the range of -40
O
C
up to +120
O
C. In order to limit the range of control so as to prevent the user of the refrigeration
device from setting the temperature outside this range, the following parameters must be set in the
right ranges: b1 (limitation of the lower control temperature range) and b2 (limitation of the upper
control temperature range).
ATTENTION
Temperatures specified in parameters b1 and b2 are not control points for switching off and
switching on the operation of the chiller.
Setting b1=b2 blocks the possibility of changing the programmed temperature by pressing the
▲
and
▼
buttons.
It is not allowed to set b1>b2.
The change in the value of b1 or b2 can be blocked by the currently set control temperature.
In the event of such a situation, change the control temperature settings and then change
the parameters b1 and/or b2.
It is also important to set the control hysteresis correctly – parameter HI. The control hysteresis is
a parameter that determines the temperature difference at which the switching off occurs and then
the chiller is switched on. For example, if the control temperature is set to +4
O
C, and the hysteresis
at 2
O
C, then switching off of the chiller will occur after reaching 4
O
C, while its re-activation will
occur after the temperature has risen to 4+2=6
O
C.
The controller makes it possible to set the hysteresis of the control in the range from 0.2
O
C to
10
O
C, every 0.2
O
C.
