27
Medium Flow Compressed Air Dryers - IOMI.
Purge Economy Operation
Compressor On Load
As the compressor is operating, the relay connection is open and the
dryer will be operating normally, drying the compressed air.
Compressor O Load
When the air compressor reaches its set operating pressure and goes
o load, the relay in the compressor will close.
is completes the circuit, supplying 24VDC to the P/E (Purge Economy) terminal, activating the purge economy mode.
When purge economy is activated:
If the dryer purge economy mode has been set up as mode 1 (see page 40), the dryer continues until the end of the regeneration cycle,
closes the exhaust valve then stops the cycle after repressurisation of the o-line column.
If the dryer purge economy mode has been set up as mode 2 (default mode), the dryer immediately closes the exhaust valve to
repressurise the o-line column then stops the cycle.
With the exhaust valve closed, no purge air is consumed, saving energy & money.
e active inlet valve will remain energised (open). e fault relay(s) and spare output(s) will remain energised.
e purge economy icon will be visible on the display.
Once the system pressure drops due to air demand, the compressor re-starts.
e compressor relay contact will open, removing the 24V DC from the Purge Economy terminal.
e normal drying cycle will now be resumed.
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