4-11
4.5 Operating Problems
Operating problems account for over 90 percent of filtration system malfunctions. If solid
shortening is being used, and the filter is operated improperly, shortening solidification will occur in
the lines as the shortening cools, increasing the chance for clogged lines.
Micro-Flo Built-In filtration systems are equipped with an overload circuit breaker to help prevent
filter motor damage in case of overload. Obstructions in the oil return lines can cause motor
overheating, which eventually results in motor overload. If the oil return valve is open and filtered
oil is not flowing into the fryer, then shortening has solidified in the lines.
Clogs or plugs can occur anywhere in the system. Locate the blockage by examining each part of
the filter system — the filter pan assembly, hoses and lines in the filter, and return lines or hoses to
the fryer.
DANGER
Never use a propane torch to melt solidified shortening in any part of the
fryer/filtration system.
4.5.1 Plugged Paper
Plugged paper: Improper use of filter powder will cause a slow oil flow return rate. The top filter
paper should be scraped (if not discarded) after filtering oil used for heavily breaded products. The
first indication of paper plugging is a surging, jerking movement of the hose. To correct, check the
instructions for the correct use of powders, and scrape the filter paper more frequently.
4.5.2 Plugged Pan Bottom Intake
Five oil-intake ports are located under the filter paper and wire grid in the filter pan. When filter
paper is changed, debris can fall into the bottom cavity where it collects around the intake ports. The
ports are located on the underside of the projecting pipe and cannot be seen. Remove the filter paper
and grid periodically to clean these ports.
4.5.3 Plugged Filter
A.
If the filtration system is equipped with a pan heater, turn the heater on for approximately 20
minutes. Residual shortening in the bottom of the filter pan should melt during this time.
Insert the flexible hose (if so equipped) into the filter pan holster and turn the pump motor
switch to the "Out" or "On" position. With the lever-operated valve "Open", visually confirm
that oil circulates in the filter. If it does not, the filter pan, filter pump or any of the hoses
and/or lines could be clogged.
B.
Disconnect the oil line from the filter pan to the pump. Put your finger over the inlet
connection of the pump and turn the filter motor switch to "Out" or "On". If suction is felt,
then the pump is clear and the plug is in the bottom of the filter, or in the filter line leading to
the pump.
