16
5.16 AIR DRYER CONTROLLER
The Air Dry Controller device controls the whole operation of the dryer, and allows the calibration of the operating
parameters. The activation of the hot-gas solenoid valve is driven by means of a probe located at the end of the
evaporator, while a cyclic electronic timer drives the condensate drain solenoid valve at regular intervals.
OPERATION -
During the dryer operation, the LED is on.
The 10 LED display indicates the current operating DewPoint, shown by means of three colors (blue-green-red) bar over
the display itself.
•
Blue section - the operative DewPoint of the dryer is too low: freeze risk ;
•
Green section - operating conditions ensuring an optimal DewPoint ;
•
Red section - DewPoint of the dryer too high, the treatment of the compressed air may be improper.
The hot-gas solenoid valve is activated when the DewPoint goes below 37ºF (Set-point) - LED on - and is
deactivated when the DewPoint goes at least over 40ºF (Set-point +
t) - LED off.
The condensate drain solenoid valve is activated for 2 seconds (T
ON
) - LED on - each minute (T
OFF
).
To perform the manual test for the condensate drain, press the button.
SET-UP -
The Air Dry Controller is adjusted during the final test of the dryer. In case of particular requirements concerning
the operation management, the user can change the setting of the programmed parameters.The parameters which can be
set up are the following :
•
Set point - activation temperature of the hot-gas solenoid valve (fix hysteresis -
t - equal to 34.7°F).
•
T
ON
- activation time of the condensate drain solenoid valve.
•
T
OFF
- pause time between cycles of the condensate drain solenoid valve.
To access the set-up, depress the set button for at least 2 seconds, LED flashing confirms the command.
First appears the Set Point parameter to access the other parameters, sequentially press the set button .
To change the value of the selected parameter, depress the set button and then the on button; the current value is
shown on the LED display. For the value range and the resolution (value of each single LED), see the following table:
The "out of scale" conditions are indicated by the intermittent flashing of the first and the last LED of the display,
respectively showing the exceeding upper and lower range.
To exit the set-up condition in any moment, press the set button . In case no operations are made during 2 minutes,
the system exits the set-up condition automatically.
35-44º F
33º F
37º F
