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Normal Operating Sequence
When pressure test gauges are attached to the test points on the manifold, the following cycling sequence should be observed. Most
types of unit malfunctions will cause a deviation in this sequence and possibly a unit shutdown or a change in cycle times.
When the concentrator is turned "On," this normal cycling sequence should be observed by attaching the pressure/vacuum gauges to
the sieve bed test points located at the top of the beds:
A.
Left sieve bed is pressurized (approximately 26 PSI or 180 kPa) and right sieve bed is depressurized to approximately 2 PSI
or 15 kPa.
1.
Four-way valve is shifted.
a. Pilot pressure is entering four-way (approximately 22-28 PSI or 150-200 kPa).
b. 12-15 VDC signal from PC board is present at terminals on pilot valve and the green four-way indicator light is
illuminated.
B.
Purging action is present (1.2 seconds) and bed pressures equalize at approximately 12-15 PSI or 80-100 kPa.
1.
Purge valve is shifted.
a. Pilot pressure is entering purge (approximately 22-28 PSI or 150-200 kPa).
b. 12-15 VDC signal from PC board is present at terminals on pilot valve for only 1.2 seconds and the green purge
indicator light is illuminated.
C. Right sieve bed is pressurized (approximately 26 PSI or 180 kPa) and left sieve bed depressurizes to approximately 2 PSI or 15 kPa.
1.
Four-way valve is in rest position.
a. The pilot valve shuts off pilot pressure to four-way.
b. No voltage is present as described in step B.
D. Purging action is present (1.2 seconds) and bed pressures equalize at approximately 12-15 PSI or 80-100 kPa.
1.
Purge valve is shifted.
a. Pilot pressure is entering purge (approximately 22-28 PSI or 150-200 kPa).
b. 12-15 VDC signal from PC board is present at terminals on pilot valve for only 1.2 seconds and the green purge
indicator light is illuminated.
E.
Step A is repeated.
NOTE – Refer to specifications for typical cycle times at 5 LPM.
T R O U B L E S H O O T I N G
18
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Troubleshooting
