AirSep AS-A, Instruction Manual

Page: 43 / 192

AirSep
®
Corporation
AS-A—AS-P Series Instruction Manual 7-7
Make slight adjustments and allow the unit to run through at
least one cycle before making another adjustment. If pressure
readings remain incorrect after the cycle completes, continue
making slight adjustments and cycling the unit until the
pressure is within the specifications listed in the Appendix A.
7.8 Adjusting the Pressure Switch
In AUTO mode, the pressure switch controls the starting and stopping of the
oxygen generator. When the pressure in the oxygen receiver increases to
approximately pressure switch upper set point, the oxygen generator runs for five
more cycles and then enters standby. At this time, the yellow light on the
AUTO/MANUAL switch goes off. When delivery of product oxygen reduces the
pressure in the oxygen receiver below pressure switch lower set point, the oxygen
generator begins to cycle and the yellow light on the AUTO/MANUAL switch
illuminates.
Although preset at the AirSep Corporation factory to the minimum and maximum
specified pressures, the pressure switch may require adjustment if the pressure of
the oxygen in the oxygen receiver registers outside the range specified. Follow the
procedures in this section to adjust the pressure switch settings when required.
Use extreme caution when performing this procedure since it
requires removal of the front cover of the enclosure while the
unit receives electrical power.
AS-A – AS-D Oxygen Generators
Typically the normally open contact of the pressure switch is used for the wiring
purposes. Please refer to the Figure 7.2 for the following adjustment procedure:
1) If the pressure switch is in the line of the final application when adjustment
(signal setting) is made, be sure that the switch can be test operated without
affecting the other equipment.
2) Remove switch cover, if any.
3) Turn adjusting nut at top of the switch clockwise until setting indicator is fully
up. Turn deadband adjusting knob on front of the switch clockwise as far as
possible. Refer to Figure 7.2.
Adjusting nut and knob will turn easily until they hit a stop. Do
not over torque. Over torque may cause damage.