Filtration Problems - Frymaster 47 SERIES Installation, Operation, Service, And Parts Manual

4. Computer times down too slowly or too
quickly.
Cause: Computer is compensating for oil
temperature via the sensitivity setting.
Corrective Action: Reprogram sensitivity
setting for each product in accordance with
programming instructions in Chapter 3.

7.9.5 Filtration Problems

The majority of filtration problems arise from
operator error. One of the most common
errors is placing the filter paper on the bottom
of the filter pan rather than over the filter
screen.
Whenever the complaint is "the pump is run-
ning, but no oil is being filtered," check the
installation of the filter paper, including 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
will allow the pump to suck air and decrease
its efficiency.
If the pump motor does not start, the most
likely cause is that the filter carriage is not
properly positioned all the way to the rear of
the fryer.
If the pump motor overheats, its 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 located on the
rear of the motor. If the pump then starts,
something caused the motor to overheat. It
may be just that several frypots were being
filtered one after the other and the pump got
hot. Letting the pump cool down for at least a
half-hour is all that is required in this case.
47 SERIES GAS FRYERS
CHAPTER 7: SERVICE PROCEDURES
7-21
More often, the pump overheated for one of
the following reasons:
• Shortening was solidified in the pan or
filter lines.
• The operator attempted to filter oil or
shortening that was not heated. Cold oil
and shortening are thicker and cause the
pump motor to work harder and overheat.
If the motor runs but the pump does not, there
is a blockage in the pump. Incorrectly sized or
installed paper will allow food particles and
sediment to pass through the filter pan and
into the pump. When sediment enters the
pump, the gears can bind up causing the motor
to overload, again tripping the thermal over-
load. Solidified shortening in the pump will
also cause it to seize, with the same result.
FREEING A SEIZED PUMP
Sediment Particle
A pump seized by debris or hard shortening
can usually be freed by manually moving the
gears with a screwdriver or other instrument.
1. Disconnect power to the filter system.
2. Remove the input plumbing from the
pump.
3. Use a screwdriver to manually turn the
gears.
Up for reverse
Down for forward