AirSep AS-A Instruction Manual page 50

Problem
Oxygen generator cycles
with AUTO/MAN switch set
to MAN. Yellow light on
AUTO/MAN switch does not
illuminate.
Oxygen generator does not
operate and green light on
ON/OFF switch illuminates.
Yellow light on AUTO/MAN
switch does not illuminate
and switch set to AUTO.
Pressure of oxygen is less
than pressure switch lower
set point.
Oxygen generator operates
continuously. Yellow light on
AUTO/MAN switch
illuminates and switch set to
AUTO. Pressure of oxygen
exceeds pressure switch
upper set point.
Oxygen generator operates
continuously. Pressure of
oxygen at specified purity is
less than the pressure
switch lower set point.
8-2
Probable Cause
Defective circuit
board/PLC.
Low voltage.
Light bulb on AUTO/MAN
switch burned out.
Loose or defective wire to
switch.
Defective circuit
board/PLC.
ON/OFF switch set to
OFF.
Defective ON/OFF switch.
Loose or defective power
wire to circuit board.
Pressure switch
improperly set.
Defective pressure switch.
Defective circuit
board/PLC.
Pressure switch
improperly set.
Defective pressure switch.
Loose or defective power
wire to pressure switch.
Defective AUTO/MAN
switch.
Defective circuit
board/PLC.
Inadequate feed air
pressure.
AS-A—AS-P Series Instruction Manual
®
AirSep Corporation
Solution
Replace circuit board/PLC.
Check power supply.
Replace switch.
Repair or replace wire.
Replace circuit board/PLC.
Set ON/OFF switch to ON.
Replace switch.
Repair or replace wire.
Adjust pressure switch as
described in Chapter 7.
Replace pressure switch.
Replace circuit board/PLC.
Adjust pressure switch as
described in Chapter 7.
Replace pressure switch.
Repair or replace wire.
Replace switch.
Replace circuit board/PLC.
Make sure feed air valves
remain fully open and lines
are not obstructed.