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13.3.3 Oil in the Towers
If the compressor produces too much oil in the outlet air and this air reaches the adsorption
dryer it will destroy the molecular sieve and pressure dew-point will get higher. In this case
however the protective bed of water-resistant silica gel will get destroyed also and the
pressure dew-point will rise faster.
Check-up procedure:
1.
Check pre-filter and after-filter for signs of oil and/or other contamination!
2.
Change the filter catridges if needed!
3.
If there is oil on the after-filter, change the adsorbent on both towers!
4.
Service and/or improve pre-filtration!
5.
Service the compressor!
Compressed air at the dryer inlet should be free of solid particles, oil particles and liquid water.
For more information on proper air preparation see the chapter
Installation Layout
!
13.3.4 Tower Fails to Depressurise
Description:
During normal operation there is a 4 min interval of purge air release when the tower
depressurizes in every-half cycle. During a half-cycle there is no regeneration/purge flow
interval on one or both towers.
Possible causes, inspection and fixing procedure:
1.
No power supply, controller is OFF
: Connect the power supply and turn ON the circuit
breaker.
2.
Dryer is in a STAND-BY MODE
: Inspect the source of the STAND-BY signal.
3.
Dryer is in a VARIABLE MODE
: VARIABLE MODE half cycle can last up to 120 minutes
during which time there is and interval of 4 minutes for regeneration/purge. Check if
the dryer is in VARIABLE MODE.
4.
Faulty control purge release valve
: Inspect the control valve coils. If one or more the
coils keeps warming up considerably compared to other coils then the coil is
malfunctioning and could be causing the failure to open the purge release valve during
the regeneration/purge interval. Order the control valves service kit.
5.
Clogged nozzle:
Inspect the nozzle. If it is clogged, clean it!
6.
Malfunctioning manometer:
In this case the dryer is operating correctly but a faulty
manometer indicates that the tower has not depressurized. If the manometer is faulty
it will show that the tower is pressurized even when the dryer is offline and
unpressurised. Contact your supplier and replace the manometer.
Summary of Contents for B-DRY Series
Page 2: ...2...
Page 15: ...15...
Page 31: ...31 5 10 Electrical Scheme Sensor Connection...
Page 35: ...35...
Page 37: ...37 Enter the password and you will get access to the controller interface...
Page 61: ...61 15 Maintenance Record TYPE OF MAINTENANCE DATE SIGNATURE NOTES Commissioned...
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