AirSep MN105-1 C - Manual (Page 37)

AirSep ® Corporation
NewLife ® Elite Service Manual
6.0 Troubleshooting
6.1 Operating Pressure Test
Testing the operating pressure is a useful diagnostic tool when a concentrator
has low oxygen concentration and requires servicing. Units functioning
normally do not require operating tests.
Use the following procedure to test the operating pressure of the unit.
1 Set the unit’s ON/OFF switch to the OFF position, and unplug the
power cord.
2 Remove the right side panel.
3 Connect the pressure test gauge to appropriate test port location. (Some
models may require an additional test adapter (KI257-1) which allows
connecting directly to the 1/4-inch black pressure tubing from the valve
block.)
4 Plug in the power cord, and set the unit’s ON/OFF power switch to
the ON position. Set the flowmeter to 5 lpm, and allow the unit to run
at least five minutes.
5 Observe the maximum and minimum readings on the pressure test gauge.
The maximum reading should not exceed 32 psig (220.6 kPa). The
minimum reading should not be less than 10 psig (69 kPa).
NOTE
When you turn the unit on, the system pressure
always registers higher than normal for the first
few minutes of operation. Make sure the unit is
not in economy mode of operation if equipped.
6.1.1 High Operating Pressure
Higher than normal operating pressure may indicate any of the
following:
 A restrictive blowdown muffler, which does not allow the
waste (purge) gas to exit the system freely.
Operate the unit with the blowdown muffler disconnected to
see if the operating pressure returns to normal.
6-1