Calibrating Thermostat Control - Frymaster Master Jet CF Series Service And Parts Manual

MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS

1.7 Calibrating Thermostat Control

1. Fill the frypot to the lower OIL-LEVEL line with oil. If solid shortening is used, it must be
tightly packed into the frypot.
2. Light the pilot. (Refer to Installation and Operation Manual that shipped with the fryer for
detailed lighting instructions.)
3. Insert a good grade thermometer or pyrometer into the frypot, about one inch from the
thermostat.
4. Set the thermostat to 325°F (163°C).
5. Allow the fryer to heat to 325°F (163°C) and cycle on and off three times.
6. With the oil temperature at 325°F (163°C) turn the flexible shaft slowly clockwise until the
burner shuts off. (Turning the shaft counterclockwise causes the temperature to increase and the
burner to light; turning it clockwise causes the temperature to decrease and shut off.)
7. Allow the fryer to sit for a few minutes and then slowly turn the flexible shaft counterclockwise
until the burner lights.
8. Repeat steps 6 and 7 at least three times to ensure an accurate setting is obtained. The thermostat
control is calibrated if the burner lights as the oil cools to 325°F (163°C) – not when the burner
shuts off as the temperature rises.
9. Compare the reading of the pyrometer to the setting on the thermostat plate. The position of the
knob on the thermostat and the reading from the pyrometer should be within 5°F (3°C) of each
other.
10. If not, loosen the setscrew and stop screw securing the thermostat shaft extension to the flexible
shaft. Remove the extension to expose the slot in the end of the flexible shaft. Use a flat-blade
screwdriver to adjust the thermostat.
11. Once the calibration point of 325°F (163°C) is determined, allow the burner to cycle on and off
at least three times to ensure it will light at the calibrated temperature.
12. Carefully replace the thermostat shaft extension, ensuring that the stop screw is pointed straight
up. Tighten the stop screw and locking nut and the setscrew, being careful not to rotate the
flexible shaft.
The thermostat flexible shaft must not be rotated while installing the thermostat
When handling the thermostat, do not rotate the shaft more than two turns in either
direction. Doing so will cause damage to the thermostat.
CHAPTER 1: SERVICE PROCEDURES
CAUTION
shaft extension!
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