Frymaster Dean FPHD - Manual (Page 12)

HIGH EFFICIENCY DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-7
Thermostats
Different types of thermostats are used in High Efficiency Decathlon Series gas fryers, depending on
fryer configuration.
Fryers equipped with a Thermatron use a dial to adjust temperature. In this configuration, the probe
resistance varies inversely with the temperature. As the temperature rises, resistance decreases at a
non-linear rate. A chart is located at the end of this chapter.
Fryers equipped with computer controls have a temperature probe. In this configuration, the probe
resistance varies directly with the temperature. As the temperature rises, resistance increases at a
rate of approximately 2 ohms for every 1°F (approximately 3.7 ohms for every 1°C). Circuitry in the
computer monitors the probe resistance and controls burner firing when the resistance exceeds or
falls below programmed temperatures (setpoints). The temperatures are programmed by means of a
keypad on the face of the computer.
All HD Series gas fryers are equipped with a high-limit thermostat. In the event that the fryer fails
to control the oil temperature, the high-limit thermostat prevents the fryer from overheating to flash
point. The high-limit thermostat acts as a normally closed power switch that opens when exposed to
temperatures above 450°F/232°C.
1.2 Accessing Fryers for Servicing
DANGER
Moving a fryer filled with cooking oil may cause spilling or splattering of the hot
liquid. Follow the draining instructions included with the fryer before attempting to
relocate a fryer for servicing.
1. Shut off the gas supply to the unit. Unplug the power cords. Remove any attached restraining
devices.
2. Disconnect the unit from the gas supply.
3. Relocate the fryer for service accessibility.
4. After servicing is complete, reconnect the unit to the gas supply, reattach restraining devices, and
plug in the electrical cords.
DANGER
No structural material on the fryer should be altered or removed to accommodate
placement of the fryer under a hood. Questions? Call the Frymaster Dean Service
Hotline at 1-800-551-8633.