Vulcan-Hart GR Series Service Manual page 40

GR Series Gas Fryers with NCC Controls (formerly Tridelta / Built after 3/05) - ELECTRICAL OPERATION
7. Cooking control cycles heat output on shortening
temperature until: power switch is turned off;
ignition input status is removed; drain valve
interlock input status is removed; temperature
probe input is outside acceptable limits; or a high
limit condition occurs.
NOTE: Steps 8 and 9 discuss open high limits. For
information on cooking control error messages, refer
to TROUBLESHOOTING.
8. If shortening reaches 415°F or higher: cooking
control turns off the heat output signal and basket
lift output signals; cancels cooking timers (if
active); disables keypad; display indicates High
Temp; and the electronic alarm sounds
continuously.
A. Turn off power switch to silence the alarm.
Fryer operation can resume when
temperature drops below 415°F.
9. If shortening reaches 450°F or higher: high limit
thermostat opens, power is removed from the
pilot valve coil, and valve closes to stop pilot gas
flow.
A. Ignition trial cycle will start, but pilot will be
unable to light.
B. Turn off power switch to silence the alarm.
Fryer operation can resume when the
temperature drops below 415°F.
Kleenscreen Filtering System
Refer to schematic diagram AI1709 for Kleenscreen
Filter System operation. Refer to Installation &
Operation manual and Kleenscreen Filtration System
Supplement manual for specific instructions on
filtering.
NOTE: The discard valve handle is connected to a
mechanical valve and magnetic reed switch assembly
to route the flow of shortening in the filtering system,
and supply power to the pump motor.
1. Conditions.
A. Fryer connected to correct supply voltage,
and is properly grounded.
B. Power switch to fryer section to filter turned
on.
C. The cooking control should be set up
properly, and ready to use.
D. Cooking control temperature setting
between 300°F (minimum) and 350°F
(maximum).
NOTE: Shortening should not be filtered outside of
this temperature range. At lower temperatures, the
F35660 Rev. A (0717)
shortening is thicker, which may increase filtering time
and place a greater load on the pump. At higher
shortening temperatures, oil seal life is decreased.
E. Filter drawer assembly installed properly.
F. Discard valve handle (white) retracted.
1)
2. Allow shortening to cycle between 300°F and
350°F for approximately 10 minutes.
NOTE: If using solid shortening, once it has melted,
stir the shortening to eliminate any solid shortening in
cold zone of the fry tank.
3. Open the drain valve to the fryer section in need
of filtering, and drain the shortening into filter
tank.
A. Display indicates draining.
B. Drain valve interlock contacts open, and the
position of the drain valve is indicated to the
cooking control.
NOTE: If using solid shortening, allow hot shortening
to stand in filter tank for approximately 6 minutes prior
to filtering.
4. Press and hold filter key on the control panel for
3 seconds. The filter output signal (24VAC) at pin
E1-9 is turned on, and the interface board K3
relay coil is energized at pins 11 and 4.
A. K3 N.O. contacts close, and 24VAC is
output from the interface board at pin 12.
B. R1 pump motor relay coil (24VAC) is
energized, and both sets of N.O. contacts
close.
NOTE: Jumper wire number 24 connects one set of
R1 N.O. contacts to R2 COM.
1)
2)
5. When filtering is completed, close the drain
valve, and allow the fry tank to refill.
A. Display indicates fill tank.
B. Drain valve interlock contacts close, and the
position of the drain valve is indicated to the
cooking control.
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Discard valve switch N.O. contacts
open. Mechanical discard valve
closed.
Fill solenoid valve is energized
(120VAC) through R2 fill relay N.C.
contacts, and valve opens.
Pump motor is energized (120VAC),
and pump circulates shortening
through filtering system.