351652602 Ed. 03
15
Cold regulation
Solenoid control (COOL relay)
If u00=0 is selected in the wizard
, coolant production
is regulated by opening/closing the solenoid valve, which
sends liquid to the thermostatic expansion valve.
If u00=1 is selected in the wizard
, coolant production
is regulated by controlling the opening and closing of the
expansion valve (PWM control).
If u00=2 is selected in the wizard
, coolant production
is regulated by controlling the opening degree of the ex-
pansion valve (stepper control). For more information on this type of regulation, please consult the
available on our website.
When the temperature in sensor S1 reaches the set point value (SP) plus the sensor differential (C1), coolant produc-
tion is activated and the temperature drops. Once the set point (SP) value is reached, the solenoid closes.
Compressor control (AUX 1 relay)
With Pump Down (Inl: 2, 5, 7)
Requires the connection of a low pressure switch in digital input 1.
When the temperature in sensor S1 reaches the set point (SP) value plus the sensor’s differential (C1), the solenoid
opens, causing the pressure in the evaporator to increase and, therefore, the low pressure switch deactivates and
the compressor starts up.
Once the set point (SP) value is reached, the solenoid closes, causing the pressure in the evaporator to decrease,
triggering the low pressure switch and stopping the compressor.
For further details of the process, see the next page.
Without Pump Down (Inl: 3, 6, 8)
The compressor operates simultaneously with the solenoid valve, starting up when the latter opens and stopping
when it closes.
Operation in the event of a fault in sensor S1
If sensor S1 fails (fault, disconnection, etc. ), compressor behaviour will depend on parameter C6, with one of 3
options available:
C6=0:
the compressor is stopped until sensor S1 begins to operate again.
C6=1:
the compressor is started-up until sensor S1 begins to operate again
C6=2:
the compressor operates in line with the average operation during the 24 hours prior to the error, taking
into account the number of start-ups and stops and the average time in each state (stop-start). If 24 hours have
not elapsed without a sensor error, the device moves to C6=3 mode.
C6=3:
the compressor operates according to the times programmed in C7 (ON) and C8 (OFF).
Solenoid
Compressor
Compressor
Low
pressure
switch
Solenoid
Compressor
Compressor
Low
pressure
switch
Summary of Contents for AKO-16526
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