Calibrating The Thermostat Control - Frymaster 47 Series Service & Parts Manual

1.7 Calibrating the Thermostat Control

NOTE: The fryer control panel must be hinged down from the control panel mounting-frame to
perform thermostat calibration. In order to hinge the control panel down, the thermostat knob must
be removed from its shaft.
1. Fill the frypot to the lower OIL-LEVEL line with cooking oil/shortening. If solid shortening is
used, it must be melted before starting the calibration procedure.
2. Ensure the fryer ON/OFF Switch is in the "OFF" position, then light the pilot. (Refer to Chapter
1 for detailed lighting instructions.)
3. Insert a good grade thermometer or pyrometer into the frypot so that it touches the thermostat
guard.
4. Disconnect the solid extension shaft from the end of the flexible shaft using an appropriately
sized Allen wrench.
5. Remove the flexible shaft from the thermostat shaft screw.
6. Place the fryer ON/OFF switch in the "ON" position.
NOTE: If the burner does not light at this time, it does not mean the thermostat is defective. Recheck
the wiring, and then slowly turn the thermostat adjusting screw counterclockwise until the burner
lights. Turning the adjusting screw counterclockwise causes the burner to light and clockwise
causes it to shut off.
7. When the cooking oil/shortening temperature reaches 325°F (162°C), turn the thermostat
adjusting screw slowly clockwise until the burner shuts off.
8. Allow the fryer to sit for a few minutes, then slowly turn the thermostat adjusting screw
counterclockwise until the burner lights.
9. Repeat steps 7 and 8 at least three times to ensure an accurate setting is obtained. The
Thermostat Control is considered to be properly calibrated if the burner lights as the cooking
oil/shortening cools to 325°F (162°C)—not when the burner shuts off as the temperature rises.
10. Once the calibration point of 325°F (162°C) is determined, allow the burner to cycle on and off
at least 3 times to be sure it will light at the calibrated temperature.
11. After the calibration is complete, place the fryer power switch in the "OFF" position and
disconnect the fryer from the electrical supply.
12. Carefully install the thermostat flexible extension on the thermostat shaft, ensuring that the
setscrews are tight.
47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-13