Service Manual
Integra E-Z Oxygen Concentrators
Chart SeQual Technologies Inc. Page 19 of 34 P/N 2917
Drive shaft rotation may be difficult to see.
Mark the shaft using a sharpie marker or grease pencil.
5.6.2 If the valve is rotating smoothly, test the compressor relief valve (See step 6).
5.6.3 If the valve motion is jerky, hesitates, or otherwise displays inconsistent rotation, replace the
ATF.
5.6.4 If there is no valve rotation, check for AC line voltage on the two-pin connector to the gear
motor. If voltage is present, replace the ATF.
5.6.5 5.8.5 If no voltage is present, check for loose connections on the eight-pin connector on the
PCA board. If continuity check in the harness doesn’t detect bad contact, replace the pod or
PCA board assembly.
5.6.6 5.8.6 To test the compressor pressure relief valve (PRV) the ATF will need to be
disconnected from the compressor:
5.6.7 Remove the air tube from the air inlet barb on the ATF and attach to the following gauge setup.
5.6.8 Install a “T” fitting to the hose from the compressor. At one end of the “T” install a pressure
gauge, at the other end install a needle valve (fully open) in series with a flow meter.
5.6.9 Start the compressor and slowly increase the pressure by closing the valve. The pressure relief
valve should not actuate until 35 (+2) psig.
5.6.10 Cycle the PRV a few times to clean out any potential contamination. Test the PRV again to see
if it activates at 35 (+2) psig. Replace if it fails.
5.6.11 If these steps do not identify the problem, contact SeQual Customer Service for assistance.
5.7. Compressor Noisy
5.7.1. Compressor noises can be either a result of vibration being transmitted to the frame or a sign of
impending compressor failure. Bearing or piston noise can be localized by holding a long
screwdriver on the compressor frame or head while placing your ear against the handle. Noise
of this type will not be repairable by rebuilding the compressor; it will need to be replaced.
NOTE:
A unit which has been exposed to temperatures below 50ºF for an
extended time may have cold-soaked the compressor piston sleeves,
causing the sleeves to contract. This will be indicated by a squealing
sound or failure of the compressor to start. Allow the unit to come up
to room temperature before operating.
5.7.2. Noise as a result of vibration transmission can occur if the heat exchanger coil has been
deformed due to rough handling. Improper coil spacing can pre-load the compressor spring
mounts, transmitting compressor vibration to the frame.
5.7.3. Remove the covers and start the unit.
5.7.4. Press on the right end of the compressor to see if noise abates.
WARNING:
There are no fan guards on the compressor. Keep fingers clear
of the fan blades!
WARNING:
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