GE Carestation 620 User's Reference Manual page 163

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Note Make sure the O2 cell plug is removed before reattaching the
breathing system.
9. Lift and reattach the breathing system base. A click sound will
be heard when attached properly.
10. Close the breathing system door.
11. Place the canister onto the canister lifter base.
12. Pull the canister lifter handle up to lock the canister into the
breathing system.
13. Calibrate the O2 cell according to the procedure.
8 Setup and connections
8-13