After a pre-set period, the function of the towers is reversed. The fully regenerated tower will now
dry the air, while the desiccant in the other tower will be regenerated.
By default, the regeneration timer will restart from the beginning of the cycle in case of a power
failure during operation or in case the on/off switch was put in position 0.
However, in case the input of remote control connector X3 (old denomination: P4 - freeze
contact, see section Electric diagram) opens (by the freeze contact), the dryer will "freeze" the
drying cycle: purge air flow stops, both solenoid valves are closed. When the contact, connected
to connector X3 closes, the dryer will switch towers and will continue normal operation. This
feature can prevent loss of compressed air (purge air) when the compressor is not continuously
running loaded. On compressors with load/unload regulation, X3 can be connected to a voltage
free contact of the compressor (contact open when the compressor runs unloaded). If no free
contact is available, an additional voltage free contact should be installed on the load/unload
contactor of the compressor to use this feature. See section Electrical connections for more
details.
Do not connect X3 when an air receiver is installed before the dryer.
X3 should only be connected when the air receiver is installed downstream of the dryer.
Flow diagrams
Depending on the dryer size, the dryer can be composed of a single dryer module (flow diagram:
see above), or of two or three dryer modules in parallel (see below):
Flow diagram CD 60+ up to CD 100+
Instruction book
12 API093050
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