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− Close all oil return valves (i.e., place all oil return handles in the OFF position). Verify
proper functioning of each oil return valve by activating the filter pump using the lever on
one of the oil return microswitches. No air bubbles should be visible in any frypot.
− Verify that the filter pan is properly prepared for filtering, then drain a frypot of oil heated to
350°F (177°C) into the filter pan and close the frypot drain valve. Place the oil return handle
in the ON position. Allow all cooking oil to return to the frypot (indicated by bubbles in the
oil). Return the oil return handle to the OFF position. The frypot should have refilled in no
more than 2 minutes and 30 seconds.