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1.1.3 Controller Options
Performance Pro gas fryers may be equipped with thermostat controls, analog controllers, digital
controllers, basket lift timers, or Computer Magic computers. In fryers equipped with thermostat control
panels, the fryer and melt cycle are turned on and off using rocker switches and the temperature is set by
a knob connected directly to the frypot-mounted thermostat. These units have no interface board. When
the melt cycle switch is placed in the ON position, the fryer stays in the melt cycle mode until the switch
is manually placed in the OFF position, even if the oil is at setpoint temperature. In units equipped with
thermostat access doors, the temperature control knob is located behind the hinged front panel. Service
procedures for this type of thermostat are slightly different from units with other thermostat controls.
Fryers equipped with other types of controllers have an interface board located in the component shield
behind the control panel.
1.1.4 Thermostats and Temperature Probes
Performance Pro gas fryers may have different kinds of thermostats depending on their confi guration.
Fryers equipped with thermostat controls have an adjustable controlling thermostat. Adjust the temperature
at which the thermostat opens and closes by turning the attached knob. The Fenwal controlling thermostat
used in these fryers is sensitive to 1° changes in temperature.
Fryers equipped with other types of controls have a temperature probe. In these units, the probe resistance
varies directly with the temperature. As the temperature rises, so does the amount of resistance at a rate
of approximately 2 ohms for every 1° (F or C) of temperature (see Probe Resistance Chart, Section 1.6).
Circuitry in the controller monitors the probe resistance and controls burner fi ring when the resistance
exceeds or falls below programmed temperatures (i.e., setpoint). To program temperatures into the fryer,
use the keypad on the face of the controller. When testing temperature probes, unplug the 15-pin wiring
harness from the controller; otherwise, the reading may be incorrect due to extra resistance.
All open burner fryers are equipped with a high-limit thermostat. If the fryer fails to properly control oil
temperature, the high-limit thermostat prevents the fryer from overheating to fl ash point. The high-limit
thermostat acts as a normally closed power switch that opens when exposed to temperatures between
425°F to 450°F (218°C to 232°C). It will automatically reset when the oil temperature drops below
350°F (177°C).
1.2 Moving the Fryer for Servicing
If it is necessary to move the fryer before servicing, complete the following actions:
1. Drain the frypot.
2. Turn off the gas supply to the unit. Unplug any power cords. Disconnect the unit from the gas
supply.
3. Remove attached restraining devices, including chain restraints and anchor straps.
4. Relocate the fryer to an appropriate area for servicing.