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MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-24
1.9.3 Improper Temperature Control (cont.)
MELT CYCLE PROBLEMS
NOTE: In early 1999, PC board melt cycle timers replaced melt-cycle timer motors in new fryers.
See Section 1.8.8 for retrofit information.
In fryers equipped with thermostat controls, the melt cycle is controlled by a mechanical timer or a
PC board. Three components that that can fail are the melt-cycle timer, the melt-cycle timer
microswitch or the control panel melt cycle On/Off switch. Isolate the defect and replace defective
component.
In fryers equipped with computers, the problem may be with the computer itself, the temperature
probe, or a malfunctioning heat relay on the interface board. Refer to the troubleshooting tables in
this chapter.
FAILURE TO CONTROL AT SETPOINT
In fryers equipped with thermostat controls, the problem will be with the thermostat itself. Possible
causes are that the thermostat is out of calibration, the knob or flexible shaft is loose on the
thermostat shaft, a thermostat wire is disconnected or broken, or the thermostat is defective. Refer to
Section 1.7 for instructions on calibrating the thermostat.
In fryers equipped with other types of controls, the problem may be with the temperature probe, the
interface board, or the controller. Refer to the troubleshooting tables in this chapter.
1.9.4 Computer-Related Problems
Computer Magic III.5 Features
Sensitivity or "Stretch Time"
Sensitivity or stretch time is a programmable feature that increases the cook time countdown based
on variations in the oil temperature from the setpoint.
The sensitivity for each product button has 10 settings (0 through 9). A "0" sensitivity setting will
disable the feature (no change in cooking time), while a nine will provide the highest sensitivity or
most change. The correct sensitivity for any product is based on the product, its density, the setpoint
temperature, and the customer’s own requirements.