Built-In Filtration System Service Procedures - Frymaster MPH14 SERIES Service Manual

1.8 Built-in Filtration System Service Procedures

1.8.1 Filtration System Problem Resolution
One of the most common causes of filtration problems is placing the filter paper on the bottom of the
filter pan rather than over the filter screen.
Ensure that filter screen is in place prior to filter paper placement and filter pump
operation. Improper screen placement is the primary cause of filtration system
Whenever the complaint is "the pump is running, but no oil is being filtered," check the installation
of the filter paper, and ensure that the correct size is being used. While you are checking the filter
paper, verify that the O-ring on the bottom of the filter pan is present and in good condition. A
missing or worn O-ring allows the pump to take in air and decreases its efficiency. Also, oil leaks
on the floor each time a vat is drained.
If the pump motor overheats, the thermal overload will trip and the motor will not start until it is
reset. If the pump motor does not start, press the red reset switch (button) located on the rear of the
motor.
If the pump starts after resetting the thermal overload switch, then something is causing the motor to
overheat. A major cause of overheating is when several frypots are filtered sequentially, thus
overheating the pump and motor. Allow the pump motor to cool at least 30 minutes before resuming
operation. Pump overheating can be caused by:
• Solidified shortening in the pan or filter
lines, or
• Attempting to filter unheated oil or
shortening (cold oil and shortening are
more viscous, overloading the pump
motor and causing it to overheat).
If the motor runs but the pump does not, there is
a blockage in the pump. Incorrectly sized or
installed paper/pads will allow food particles
and sediment to pass through the filter pan and
into the pump. When sediment enters the pump,
the gears bind, causing the motor to overload,
again tripping the thermal overload. Shortening
that has solidified in the pump will also cause it
to seize, with the same result.
A pump seized by debris or hard shortening can
usually be freed by manually moving the gears
with a screwdriver or other instrument.
CAUTION
malfunction.
Sediment Particle
1-9
Sediment Particle
Oil Flow
Up for reverse
Down for forward