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Removal and replacement procedures 45
3. Loosen the two thumbscrews on the bottom of the fan unit.
CAUTION: The fan unit weighs 16.8 kg (37 lb). Use extra caution when removing and
replacing the top fan unit because it might be higher than your shoulders and is heavy and
awkward to lift.
4. Pull the fan unit out toward you, and remove it from the MCS unit.
To replace this component, see "Replacing the bottom fan unit (on page 45)."
Replacing the bottom fan unit
1. Align the fan unit to the sliding rails.
CAUTION: The fan unit weighs 16.8 kg (37 lb). Use extra caution when removing and
replacing the top fan unit because it might be higher than your shoulders and is heavy and
awkward to lift.