Revision 1 – 04.12.2015
24/28
Solenoid valve operation (RL4)
The symbol
indicates the load solenoid valve is ON.
The unload timer Wt4 can be managed according two different ways settable on C03.
1.
Wt4 set as fixed timer
: when the pressure reaches stop set, the load solenoid valve (RL4) switches OFF and the timer
Wt4 starts; once the timer is over, if the pressure is not yet under the start pressure, the compressor stops.
During that timer, if the pressure goes down the start set, the load solenoid valve (RL4) switches in ON and Wt4
erases.
2.
Wt4 set as variable timer
: at the first start the compressor follow the same cycle repoterd on point 1 above; during the
next cycle the controller counts time the pressure spent to go from stop set to start set; if this time (
tx
), is bigger the
Wt4 set, the next Wt4 timer will be shorter (1 minute less) and so on till a minimum time of 2 minutes.
While
tx
will be lower than Wt4 changed, the unload time uploaded will be Wt4 set again.
ATTENTION
: on the contact of the solenoid valve relay is mounted an RC filter (22
F + 100
) sized for a power of 4,7W;
in case you use a solenoid valve with less power, if the solenoid valve keeps on exciting while the contact is open, you have
to delete this filer by cutting the terminal of the resistor R11.
Thermoregulation of the fan (default RL5)
The symbol indicates the fan is on.
While delta contactor is on:
air end temperature equal or higher than WT3 = fan ON
air end temperature lower than (WT3 - WT4) = fan OFF
Operation of the condensate drain solenoid valve (default RL6)
The symbol indicates the condensate drain is activated.
During the operation of the load solenoid valve (RL4), the condensate drain solenoid valve (RL6) operates according the
parameters Wt6 and Wt7; besides it is OFF while load solenoid valve is off too.
Compressor status (settable on RL5, RL6 or RL7)
When the compressor is ON the relay is activated, when the compressor is OFF because the pressure set is reached, the
relay is OFF.
Compressor start/stop under weekly timer control
When the compressor is operated by weekly timer, during OFF time the display visualizes the symbol
with day and time
of the next ON; during the operation the same symbol is visualized on the top right corner of the display.
When the compressor is in operation under timer control you can stop it by simply pushing the Stop button and you can
restore it under timer control by pushing Start only.
When the compressor is stopped by timer you can start it by keeping on pusher the Start button for 5 seconds and you can
restore it under timer control by pushing the Stop button only.
