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CALIBRATION PROCEDURE FOR GGT GRIDDLES
Locate the reading positions
Make sure the griddle surface is clean. Grease or food particles on the griddle will result in inaccurate
thermostat calibration.
Mark the locations where the temperature probe will be placed for testing. See the sketch provided. Starting
from the left side of the griddle measure 8” to the right and 10-5/8” from the rear splash guard. With a felt tip
pen mark this location. This is the location directly over the center of the left thermostat bulb. From this point
measure right 10” remaining 10-5/8” from the rear splash guard. Mark this location with a felt tip pin. This is
the location over the next thermostat bulb. For a 36” GGT repeat this one more time 10” to the right and for
the 48” GGT repeat this twice more 10” to the right always remaining 10-5/8” from the splash guard. After all
locations are marked center the temperature probe on each marked location, and then trace a circle
around the probe.
This procedure will place the temperature probe over the center of each thermostat bulb, and this is the only
place temperature readings should be taken.
Set all thermostats to 350ºF and allow them to cycle three to four times, or allow the griddle to preheat for ½
hour before proceeding. This makes sure the griddle temperatures have saturated the surface.
Determine the differential
Note the temperature for each section of the griddle as the burners ignite.
Note the temperature for each section of the griddle as the flame extinguishes.
The flame extinguish temperature minus the ignition temperature equals the differential.
EXAMPLE: Flame extinguished 367ºF
Flame ignition 341ºF
Difference 26º F = Differential
If the temperature differential is large than 75ºF, there is probably a problem with your system. It may not be
the thermostat. First make sure you thermostat probe is flat against the griddle plate and is making good
contact. Dirt under the probe will cause inaccurate readings. Next make sure the thermostat bulb is held
tightly in its holder. If you can pull the capillary tube and the bulb moves it is not held tight enough against the
griddle plate. This will cause variations in the temperature of the griddle surface. If both of these items have
been checked and you still have a differential over 75ºF then the thermostat is bad replace it.
Determine the average temperature
Note the temperature for each section of the griddle as the burners ignite.
Note the temperature for each section of the griddle as the flame extinguishes.
The flame extinguish temperature plus the flame ignition temperature divided by two equals the average
temperature.
EXAMPLE: Flame extinguished 367ºF
Flame ignition 341ºF
708º / 2
Average temperature = 354ºF
If the average temperature is within 15ºF of the dial marking you probably leave the calibration where it is. If
the average temperature is outside of 15ºF of the dial setting you will want to calibrate the thermostat. To
calibrate a thermostat first remove the knob by pulling it straight off the shaft. Next take a small flat head
screw drive and turn the screw inside the shaft, clockwise to decrease, counterclockwise to increase. ¼ turn
clockwise will decrease the temperature approximately 24ºF. ¼ turn counterclockwise will increase the
temperature approximately 24ºF. Adjust and re-measure the average temperature until you get the
temperature to your desired point.
NOTE: avoid making more than ½ turn at a time. Calibration is not linear and you can get the thermostat
significantly out of calibration to a point where it is difficult to reset.
If after adjusting the thermostat three times and getting no change in calibration the thermostat is bad. Then
replace the thermostat.
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