CTA
Instruction Manual
MPE
Reference: MT0027DA
This document may be modified without prior notice
10
Revision date: 11/05/06
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5.3
Changing purging duration
General Comments
Condensate purging automatically starts every 5 minutes for duration adjustable from 1 to 20 seconds. The
factory setting meets nominal drier operation conditions. However, you may have to:
•
Increase the duration of purging if the temperature of the air to be treated is higher than nominal and if
you find liquid phase water downstream from the drier.
•
Reduce the duration of purging if the temperature of the air to be treated is lower than nominal (case of a
water-type final cooling agent downstream from the air compressor) or if the compressed air to be treated
is not moisture-saturated (due to pre-drying or partial expansion)
Correct adjustment of the duration of purging is designed to limit compressed air leakage of to the bare
minimum necessary for this operation.
Correctly regulated purging:
•
expels condensates (oil/water emulsion) during most of the purging sequence.
•
releases a short blast of dry, condensate-free, compressed air at the end of the purging sequence.
Adjustment
•
Press on button
for 15 seconds.
The purge duration value flashes on the digital display panel.
•
Use the buttons to modify the purging duration value
The adjustment range is from 1 to 10 seconds.
•
To record the new value, wait 5 seconds without pressing a key. The digital display panel reverts to its
normal status (i.e. stops flashing).
•
In case of extreme conditions of air drier working, it’s possible to adjust the closing time of the solenoid valve.
Example, for adjusting the closing time 4 minutes (value adjusted in factory) to 2 minutes:
•
Press on button
for 15 seconds.
The purge duration value flashes on the digital display panel.
•
Use the buttons to modify the closing time to 2 minutes for example
•
To record the new value, wait 5 seconds without pressing a key. The digital display panel reverts to its
normal status (i.e. stops flashing).
5.4
Purge test
General comments
Use the purging TEST button for:
•
first start up
•
routine testing,
•
to depressurise the drier for maintenance.
Procedure
1.
Press the TEST button. Check that the solenoid valve opens and those condensates run out. Check that
the Purge LED comes ON.
2.
Press the TEST button. Check that the solenoid valve is closed and that condensate purging stops.
3.
Wait 5 minutes and re-check that purging is carried out correctly.
4.
If necessary, change the purge duration (see § 5.3).
Note: Each pressure on the TEST button opens or closes the solenoid purge valve. If you leave the solenoid purge valve
open, it will be closed automatically at the end of the pre-set purge duration time.
