CAIRE NewLife Elite, Technical Manual

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MN240-1 Rev C
40
6.1.2 Low Operating Pressure
If the oxygen concentration level at the desired liter flow is within CAIRE’s
specifications, no service is required, even if operating pressure is low. If
concentration is below specifications at the desired liter flow rate with low
operating pressure, this may indicate any of the following:
•
A restriction in the intake resonator, which limits the amount of room air
available to the compressor.
Disconnect the braided tube at the compressor, and allow the unit to operate
without the intake resonator to see if normal operating pressure returns.
•
A compressor with reduced output.
If it is below specifications, replace or repair the compressor.
•
An improperly operating circuit board or solenoid valve.
Confirm that the circuit board and solenoid valves function properly.
•
A leak in the unit, which allows system pressure to escape.
Leak test unit.
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. For Intensity units 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. For Elite units verify the flowmeter tops out at 5.5LPM. If the
flowmeter ball goes lower or higher than 5.5LPM, 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 the operating pressure, please refer to section 6.1.
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.