A-3
“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
Appendix A: Desiccant Dryer
A.2.4 Maintenance Shut Down
1. CLOSE the dryer outlet isolation valve.
2. CLOSE the dryer inlet isolation valve.
3. Allow the dryer to continue to cycle until
the purge exhaust fully depressurizes both
chambers.
4. Switch off electrical power to the dryer by
removing the fuse.
WARNING:
Display prominent notices indicating that
maintenance is being carried out.
A.3 Trouble Shooting
WARNING:
Always notify the appropriate facility
staff before performing any maintenance
or service procedures on the air system.
Compressed air levels may be aff ected
during maintenance or service procedures.
WARNING:
Some of the following trouble-shooting
checks are conducted while the dryer’s
electrical power supply is energized.
THEREFORE, A POTENTIAL ELECTRICAL
SHOCK HAZARD EXISTS. A qualifi ed
electrical technician should conduct
these checks. The dryer’s electrical power
supply must be de-energized before any
electrical maintenance or repair work is
conducted.
WARNING:
Ensure that the dryer and associated
pre-fi lter(s) and afterfi lter(s) are valve
isolated and fully depressurized before
attempting to remove or disassemble any
subassemblies or components. Failure to
do so may result in serious personal injury
and/or equipment damage.
CAUTION:
Each component has been selected
to compliment the performance of the other
components of the system. Therefore, use of
unauthorized parts or improper operation will
degrade system performance.
IMPORTANT:
Water molecules can diff use
through a pinhole size leak even though pressure
inside the piping is several hundred PSIG. It is not
at all uncommon to have a minute pinhole leak
in a gas line cause an increase in dew point from
-40ºF to -10ºF at a distance of forty or more feet
downstream of the leak.
WARNING:
Compressed air can be dangerous unless
safety precautions are observed in the
use of compressed air and compressed
air equipment. Completely vent the
internal air pressure to the atmosphere
before disassembling any subassemblies
or components and before doing any
work on compressed air equipment. To
vent internal air pressure, follow the
maintenance shutdown instructions.
