AirSep MN118-1 B - Manual (Page 26)

MN118-1 rev B
02/14
21
6.2 General Troubleshooting
Before reviewing the troubleshooting chart, the following steps may be useful to isolate
any malfunctions:
1.
Turn on the concentrator. If the unit does not turn on, refer to the troubleshooting
chart.
2. Verify the outlet pressure is 20 psig (138 kPa). If the outlet pressure is not
at 20 psig (138 kPa), the product regulator needs to be reset. Refer to Section 5.9.
3. Make sure the unit is cycling properly by:
a. observing the flowmeter ball is stable in flowmeter. (Flowmeter ball does not
move up and down more than ¼ of a liter.)
b. checking circuit board if high or low pressure lights are illuminated and audible
pressure alarm is sounding.
4. Place your thumb over outlet of unit. The flowmeter ball should drop to the bottom
of the flowmeter. If the ball does not drop completely to the bottom, there is a leak
present between the top of the flowmeter and the outlet of the unit.
5. If concentrator is not meeting specifications, make sure that the unit is leak-free by
testing all tubing connections and fittings with leak testing solution. Protect circuit
board(s) from solution and start leak test at the heat exchanger, following air flow
of unit to oxygen outlet. Repair all leaks by tightening connections and fittings.
6. Set the concentrator at 8 lpm and connect pressure test gauge to unit. Determine
pressure parameters by observing high and low pressure points on the gauge. If
pressures are high or low, refer to Section 6.1.
7. Review troubleshooting chart to isolate and repair any other malfunctions.