5
3. START UP
Ensure that the dryer is by
−
passed, or there is no load on the cooler. Switch on the main electrical isolation switch (if present). The
control panel will show the message OFF, indicating that the line and control voltages are available.
Start sequence
The dryer will initially start by pressing and holding the ON/OFF button for 1 second. The start sequence will progress only if there are no
active alarms. The compressor motor will start AFTER 120 SECONDS. The fan motor will start simultaneously with the compressor.
Stop sequence
The dryer can be stopped locally from the control panel. After having pressed the ON/OFF switch for 1 second, the compressor and the
fan motor will continue running for an additional 10 seconds in order to re-balance the internal pressures. The dryer can also be stopped
due to an alarm or energy saving condition (ESA or ES2). Any alarm will de
−
energize the compressor though the fan motor may still be
running , it depends on the type of alarm (see Display indications chapter). If the shutdown is due to an alarm, a message will blink on
display indicating the reason for the shutdown. Energy saving condition (ESA or ES2) occurs when the dew point stands below the set
value for a long time in order to save energy and avoid heat exchanger freezing. This situation can happen when ambient temperature
is low and there is no compressed air load.
Energy Saving System
A patented 3-layer (air / glycol / freon) heat exchanger allows the dryer to utilize the full power of the refrigeration system. Maximizing
the efficiency by storing the surplus energy in the glycol. The result is that at partial load the microprocessor can swich off the
refrigerant system for significant periods of time while the glycol circulation system (always running) ensures a constant dew point.
Under standard load conditions, the refrigerant circuit is turned on 100% of the time. No load conditions result in about 5% usage only.
3.1 CONTROL PANEL
The dryers are provided with an electronic control system. All adjustments and resets can be performed by means of the digital
panel located on the front of the dryer.
The control panel is composed of 5 keys (ON/OFF, TEST, SET, DOWN and UP) and a 3 digit display, with three signalling LEDs
indicated by icons (PIC 1)
PIC. 1
DISPLAY VISUALIZATION
AND SIGNALING LEDS
*Not used with Zero Loss Drain Option
DISPLAY DESCRIPTION
the unit is ON with low load
the unit is ON with normal load
the unit is ON with normal-high load
the unit is ON with high load
LED STATUS
DESCRIPTION
ON
Compressor energized
Blinking
Programming mode activated
ON
Condensate drain energized*
Blinking
ON
Speed of the fan = 100%
Blinking
Speed of the fan < 100%
OFF
Fan not running
