Huntleigh Flowtron AC550, Service Manual

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9. With the pump displaying
‘C7’
, reapply 70 mmHg to the tubing and
press the Single Leg button, ensuring that the pump beeps and the
display changes to
‘CC’
.
10. Press the Single Leg button ensuring the display shows 70
± 2 mmHg.
Switch the pump off and disconnect from the power supply. Reconnect
the transducer tubing securely and replace the top cover prior to
switching the pump on again. Check the accuracy using the Calibration
Check method described earlier.
4.5 Component Part Replacement
It is recommended that the following parts are replaced at each Preventive
Maintenance period.
4.5.1 Dismantling the Pump Unit
Before dismantling the pump unit ensure it has been isolated from the power
supply by removing the power cable from the wall outlet.
To remove the case lid, place the unit upside down on a flat, clean surface.
Remove the rubber feet and unscrew the four self tapping screws.
Holding the unit in both hands, turn it onto its base and carefully remove the lid
and place to one side.
4.5.2 Replacing the Compressor Assembly Components
Unscrew and remove the four M4 countersunk screws. Remove the lid and
gasket and place to one side.
Note: if any changes are made to the compressor, it is essential that the flow rate
is checked to ensure that the compressor is still within specifications.
4.5.2.1 Silencer Bag Assembly
Disconnect the silencer bag outlet tubes from the four way connector.
Disconnect silencer bag inlet tubes from valve body assemblies.
Replacement is reverse of above procedure.
4.5.2.2 Bellows/Armature Blade Assemblies
Using long nosed pliers, extract armature blade from pivot point. Unclip bellow
from valve body assembly.
Replacement is reverse of above procedure.
4.5.2.3 Compressor Valve Body Assembly
247901 4-6 Issue 1
March 1998