Vulcan-Hart GRS25 Service Manual page 6

HI LIMIT CHECK
1. Place pyrometer in the tank 1/2" above the crumb screen in the center of the vat.
2. Turn fryer on.
3. Bypass the hi limit by running a jumper wire between pins 13 and 14 on the temperature board. Run the
appliance temperature up to between 465-470 degrees F.
4. Remove bypass jumper, observe reading, the hi limit should trip fryer heating at between the temperatures
of 435-465 degrees F. If tripping does not occur replace limit.
FRYER TEMPERATURE CALIBRATION CHECK
1. Turn fryer on and allow temperature to stabilize by letting the fryer cycle on and off, after reaching the set
temperature, at least three times.
2. Place a pyrometer sensor in the tank 1/2" above the crumb screen in the center of the vat.
3. After the stabilizing period the shortening temperature reading of the pyrometer should match the
temperature dial with in plus or minus 10 degrees for GRS Fryers and 5 degrees for GRD and GRC Fryers.
4. If readings are not in tolerance continue with the following steps.
5. Turn temperature dial to a mid range position.
6. Allow temperature to stabilize for several minutes.
7. For GRS Fryers remove temperature dial knob and with a small flat head screwdriver rotate the adjustment
screw to match pyrometer reading clockwise to increase and counterclockwise to decrease setting. One
quarter turn will change the temperature by 18 degrees.
For GRD Fryers using small flat blade screwdriver loosen the temperature control knob set screw. Without
moving the shaft rotate the knob to match the reading of the pyrometer and retighten knob.
8. Check temperature cycling again to insure proper calibration.
BASKET LIFT MICRO SWITCH (Option)
1. Follow steps 1-6 under Removal of Basket Lift Back.
2. Remove switch wiring. Engage the switch and with an ohm meter check for continuity across the common
and normally open circuits. If continuity is not shown replace the switch.
BASKET LIFT MOTOR (Option)
1. Follow steps 1-6 under Removal of Basket Lift Back.
2. Follow steps 1-7 under Removal of Basket Lift Motor.
3. With volt meter and power on check for voltage to the motor.
4. Verify that the motor voltage is proper for the unit voltage as stated on the appliance rating plate.
5. Check the motor wire connections.
6. Unplug the fryer and disconnect the motor wires at the motor terminals.
7. With ohm meter measure the resistance across the terminals. The resistance should be about 28 ohms.
8. If resistance is not correct replace the motor unit.
BASKET LIFT TIMER (Option)
1. Follow steps 1-2 under Removal of Control Panel (Solid State Construction).
2. Check for good wire connection at the terminals.
3. Push power switch "on".
4. With a volt meter check for 24vac across the input terminals of L1 and L2.
5. With a volt meter check for 24vac across the load terminals after setting the timer and pushing the timer
button. Reading should remain constant at 24vac until the timer runs out.
6. If the above readings are not achieved replace timer.
BASKET LIFT ARM ADJUSTMENT (Option)
This is only required if basket lift arm is not properly raising and lowering the fryer baskets correctly into the tank.
1. Turn the fryer off and allow it cool.
2. Remove the fryer baskets.
3. Pull lift arm from the cooker
4. Turn the adjustment bolt, by hand, to the required height.
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