nano
pg. 17
Operating procedure
After the initial startup, the dryer operation is completely automatic. To
understand the details of the operation, we recommend you use the flow
diagram and the timing sequence of the dryer.
Fully automatic, dual-tower externally heated desiccant dryers continuously
adsorbs water vapor from compressed air. The air is dried as it passes
through the desiccant bed of one tower while the bed in a second tower is
being reactivated. Reactivation of the saturated desiccant is accomplished
with the use of heat and atmospheric air via a blower. Dryer operation is
performed automatically on a solid state timing module or PLC. In order to
prevent line surge and to minimize desiccant attrition, switching from one
chamber to the other is carried out only when both desiccant chambers are
at equal pressure. The tower being reactivated will be re-pressurized at the
end of its reactivation cycle before switch-over takes place. Purge flow and
depressurization are in an upward direction, counter to the drying flow.
Maintenance
Prior to performing any maintenance on the dryer, all personnel are strongly
advised to familiarize themselves with the equipment by reading the
entire contents of this operation manual. nano strongly recommends
the strict adherence of all the safety procedures prior to any
performing any maintenance activity on the dryer.
A.
Th
e pressure differential indicator referred to as the “Delta
-
P” is a very
good indicator of the state of the filter elements. Maintenance
personnel must pay attention to these to keep the dryer running with
full efficiency.
B.
The useful life of a filter element depends on the quality of air.
C.
Powdered desiccant can accumulate in the muffler and increase the
backpressure in the regenerating tower.
D.
Oil and oil vapor can drastically reduce the life of the desiccant. Take
precautions to eliminate all traces of oil from the airflow
Weekly checklist:
1.
Check all drain valves, prefilter, after filter and separators.
2.
Check the pressure differential indicators (Delta-P) on the pre-filter
and afterfilter.
3.
Check all control panel lights.
4.
Verify purge flow indicator. The purge flow depends on the set
dewpoint (PDP)
5.
Check the dewpoint monitor to ensure that the dewpoint is being
achieved.
Summary of Contents for NBP Series
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