Datex-Ohmeda Anesthesia Delivery Unit S/5, Technical Reference Manual

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Datex-Ohmeda ADU
A-38
Document No. 8502853
Removal of the WGU
Follow the steps below to remove the WGU.
Tools: 4 mm Allen wrench
1. Disconnect the pipeline gases and close cylinder valves.
2. Disconnect all external gas connections and reserve gas cylinders from the WGU.
3. Turn the N
2
O/Air selector switch into N
2
O position and release N
2
O and Air pressures by first
opening the N
2
O flow fully and then opening O
2
flow to 1 l/min.
4. Turn the N
2
O/Air selector switch to Air position and release Air pressure by opening the Air flow
control.
5. Remove the rear plastic cover (10 screws).
6. Remove the lower left side cover underneath the bellows block (? Allen screws).
Figure 33 Two multiconnectors mounted with four screws
7. Remove the 10 remaining screws (plus washers) which hold the WGU to the frame.
8. Gently pull out the WGU and put it on a bench.
9. To reinstall after servicing, do the above steps in reversed order. Make sure the multiconnector
gaskets are in place before mounting them back the A-WGU.
10. Do a Functional Check. Replacement of Non-return Valves in the WGU
Replacing tubings or connectors
Always replace tubing that are damaged in anyway.
Always use D-O supplied tubing so correct type of material is maintained at its application.
Inspect the end of tubing before installing it to a connector, if the tube end are damage in any way can
it be cut straight with a racer sharp tool before connected. If the tube get to short so it gets tensed at
installation must it be replaced with a new tube.
When removing a tube from a quick connector the locking mechanism must first be pushed towards
the connector before the tube can be pulled out. See figure below.
Figure 34 Removing a tube from a quick connector
To install a tube to a quick connector, push the tube firmly into the bottom of the connector. Then it
will be locked (see figure below).