INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 22
SECTION 4 MAINTENANCE
* Advice
In order to ensure continuous and trouble-free operation, a maintenance
contract with
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®®
is recommended.
Also, the following points should be checked regularly:
Daily
•
Carry out a general visual check and watch out for possible disturbances
during operation.
•
Check function by manually operating the automatic condensate drain on the
pre-filter.
•
Do an optical color test on the blue gel indicator for non-DDS dryers:
Indicator Color Approx. dew point [ °C]
Blue gel
Blue
Pink
Transparent
- 25
0
+ 15
Weekly
•
Check the differential pressure on the pre-filter, which should not exceed 10
PSID. Values greater than this indicate that the filter cartridge must be
changed.
•
Check the differential pressure on the after-filter, which should not exceed 10
PSID. Values greater than this indicate that the filter cartridge must be
changed.
•
Check the backpressure at the silencer placed behind the exhaust valve, it
should not exceed 5 PSIG. Use the gauge of the vessel that is to be
regenerated.
Annually or after every 2500 hours of operation
•
Check the desiccant for impurities and change it if necessary. A brownish /
yellowish tone indicates that it has been soiled with oil. The desiccant has a
normal lifetime of about 8000 operating hours.
•
Check the seat o’rings on the outlet check valves.
•
Check the function of the 3-port inlet valve operation by sending electrical
control signals.
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