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Improper temperature control problems can be categorized into melt cycle problems and failure to
control at setpoint problems.
MELT CYCLE PROBLEMS
Initiation of the melt cycle with CM7 computers is automatic. Problems may originate from the
computer itself, the temperature probe, or a malfunctioning heat relay on the interface board.
FAILURE TO CONTROL AT SETPOINT
Problems in this category may be caused by the temperature probe, the interface board, or the
computer.
1.10.4 Computer Malfunctions
RECOVERY TIME
Recovery time – is a method of measuring a fryer’s performance. Put simply, it is the time required
for the fryer to increase the oil temperature from 250ºF to 300ºF (121ºC to 149ºC). This range is used
as a standard since ambient kitchen temperatures can affect the test if lower ranges are used.
The CM7 computer performs the recovery test each time the fryer warms up. An operator can view
the results of the test any time the fryer is above the 325ºF (163ºC) point by pressing the INFO button
once when the fryer is on. The test results will be displayed in the computer’s LED panel in minutes
and seconds. The maximum acceptable recovery time for Protector
®
series gas fryers is two minutes
and twenty-five seconds.
1.10.5 Filtration Malfunctions
The majority of filtration problems arise from operator error. One of the most common errors is
placing the filter pad on the bottom of the filter pan rather than over the filter screen.
Whenever the complaint is “the pump is running, but no oil is being filtered,” check the installation
of the filter pad, including that the correct size is being used. While you are checking the filter
paper/pad, verify that the O-rings on the filter pan suction tube are present and in good condition.
Missing or worn O-rings will allow the pump to suck air and decrease its efficiency.
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 front of the motor. If the
pump then starts, something caused the motor to overheat. It may be just that several frypots in a
large battery of fryers were being filtered one after the other and the pump became hot. Letting the
pump cool down for at least a half-hour is all that is required in this case. More often, the pump
overheated for one of the following reasons:
• Shortening that remained in the pan after previous filtering solidified in the suction tube
recess in the bottom of the pan or the suction tube, itself. Adding hot oil to the pan and
waiting a few minutes will usually correct this problem. A flexible wire can be used to clean
out the suction tube and the recess in the bottom of the pan. NEVER use compressed air to
blow solidified shortening out of the suction tube!