AirSep MN138-1 H - Manual (Page 33)

27
MN138-1 Rev H
02/14
Check compressor intake path for obstruction. Clean/remove obstruction and verify
normal operating pressure returns.
• An improperly operating circuit board or solenoid valve.
Confirm that the circuit board and solenoid valve function properly.
• A leak in the unit, which allows system pressure to escape.
Leak test unit.
• A compressor with reduced output.If it is below specifications, replace or repair the
compressor.
5.2 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. Turn the flow meter knob until it is wide open at the highest setting. The ball should be located
½ liter above the maximum flow rate. If the flow meter ball is not located at this setting, adjust the
regulator until the ball is set ½ liter above the maximum flow rate with the flow meter completely
open.
3. Make sure the unit is cycling properly by:
a. observing the flow meter ball is stable (flow meter ball does not move up and down more
than ¼ 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 compressor, following air flow of unit to oxygen outlet. Repair all leaks by
tightening connections and fittings.
6. If unit is alarming, refer to the Alarm Indicator Chart in Section 2.3 for probable solutions.
7. Set the concentrator at the maximum flow rate
and connect an operating 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 5.1.
8. Review troubleshooting chart to isolate and repair any other malfunctions.