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GR SERIES GAS FRYERS - SERVICE PROCEDURES AND ADJUSTMENTS
SERVICE PROCEDURES AND ADJUSTMENTS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR
MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL
TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT
/ TAGOUT PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
CONTROL THERMOSTAT
CALIBRATION
NOTE: Check the level of shortening in fry tank
before proceeding. When the oil temperature is
within normal operating range (325 / F - 375 / F), the
level must be between the MIN & MAX fill lines.
1.
Place a thermocouple in the geometric center
of the fry tank 1" below the oil surface.
2.
Set control thermostat to 350°F.
3.
Allow the shortening temperature to stabilize
(normally 3 cycles).
4.
Record the temperature reading from the
meter, at which the main burners turn off and
turn on for at least two complete heating
cycles.
5.
Calculate the differential temperature by
subtracting the temperature reading when the
main burners turn off to the temperature
reading when the main burners turn on.
[ Differential = Temp. (burners off) - Temp. (burners on) ]
Example: 360/ (burners off) - 340/ (burners on) = 20/F.
The differential calculated should be less than
20/F.
A.
If the differential is less than 20/F, the
control thermostat is functioning properly.
B.
If the differential is more than 20/F, the
control thermostat is malfunctioning.
1)
Install a replacement control
thermostat as outlined under
CONTROL THERMOSTAT in
REMOVAL AND REPLACEMENT OF
PARTS.
6.
Calculate the average temperature by adding
the temperature reading when the main burners
turn off to the temperature reading when the
main burners turn on and divide this answer by
2.
[ Temp. (burners off) + Temp. (burners on) ] ÷ 2 =
Average Temp.
Example: 360/ + 340/ ÷ 2 = 350/F.
The average temperature should be
350°F (± 10°F).
F25125 (March 2003)
A.
If the average temperature reading is
within tolerance, the control thermostat is
properly calibrated.
B.
If the average temperature reading is out
of tolerance, continue with procedure.
7.
To adjust:
A.
Remove control thermostat knob.
B.
Hold control thermostat shaft and turn the
inner set screw clockwise to decrease
temperature or counterclockwise to
increase temperature (1/4 turn = 18 / F).
C.
Replace control thermostat knob and
repeat step 6 for up to three attempts.
Allow the main burners to cycle at least two
times between adjustments before
performing the calculation.
1)
2)
8.
If the above adjustment cannot be obtained,
install a replacement control thermostat as
outlined under CONTROL THERMOSTAT in
REMOVAL AND REPLACEMENT OF PARTS.
Page 12 of 24
When calibration is successful,
remove control thermostat knob and
apply a non-permanent adhesive
material to set screw head to secure
from rotation.
Replace control thermostat knob.
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