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③ Check cooling air
Check that cooling fan is turning and cooling air is flowing in that direction as indicated.
Cooling fan
Outlet of cooling air
Inlet of cooling fan
Important
Vacuum pump turns counter-clockwise when viewed from motor side.
Check that air comes out from outlet.
If air does not come out from outlet, stop vacuum pump, turn off electrical source and change 2 out of 3 cords of
electrical source connection.
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