Table of Contents
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Chapter 1: HOW DOES IT WORK?
The SEH 50 fryer components function in specific
order of operation. Knowing and understanding the
sequence of fryer and components operation will enable
you to diagnose equipment failure more accurately.
Heating System
Power to the machine is turned ON:
•
If Fuse F1 on the Relay board is good, the A.C.
light will illuminate. The computer is supplied with
24VAC and, if the drain valve handle is closed, the
proximity switch will supply 24 VAC to the DVI
(drain valve interlock) Input at the computer.
•
The computer is turned ON:
•
The side on relay will be energized, closing the
circuit and the S.O. light on the Relay Board will
illuminate. If the hi limit is NOT tripped the safety
(side on) contactor will energize.
•
Computer calls for heat:
•
The 24 VDC "heat demand" relay will energize
supplying the heat demand contactor with 24 VAC
and the H.D. light on the Relay Board will
illuminate. This will also supply the computer with a
heat feedback signal.
Hi Limit System:
• If the hi limit trips, it causes the side on and heat
demand contactors to lose 24VAC supply and the
heat feed back loses 24VAC. The computer will
display IGNITION FAILURE or HEAT FAIL.
After the hi limit resets (unit cools to 375°F + 20°F)
the computer will have to be turned off and back
on for the unit to heat.
Filter System:
•
Opening the RED return valve handle will close the
proximity switch causing the "pump run" relay to
be energized. The pump motor will begin to run.
Closing the return valve handle will de-energize the
relay and the pump motor will stop running.
•
The pump system is equipped with a circuit breaker
which will de-energize the system and the heat tape
in the event of overcurrent. The circuit breaker
switch must be in the ON position for the pump and
heat tape to operate.
L22-238 Rev 0 (08/03)
•
The return piping system may be provided with
optional heat tape to prevent solidification of solid
shortening. The heat tape is low wattage and is on
constantly to maintain liquid shortening in the line.
Optional Basket Lift:
•
The basket lift is a self contained unit that requires
a 120, 208 or 240V supply. With most fryer con-
figurations, the power is supplied from the entrance
box at the back of the fryer but some cofigurations
will require power direct from a wall outlet. When
power is supplied to basket lift assembly, the bas-
kets will lift to the up position. The baskets will
lower with a 24 VDC output from the controller.
Chapter 2: COMPONENT
TROUBLESHOOTING:
Probe:
The resistance of the probe will change as the tem-
perature changes. The resistance will decrease as the
temperature rises. The lower the temperature the
greater the resistance change will be per degree of tem-
perature change, as the temperature approaches the
working range of the probe, the resistance change will
become more linear.
4
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Table of Contents
Troubleshooting
