Frymaster H55 Series Technical Reference Manual page 105

traditional interface board used in the earlier LOV fryers.
The UI and the SIB assume the role of the Manual Interface Board that was
on the earlier fryers, meaning manual functions performed on the MIB are
now performed with the touchscreen. Onboard diagnostics improve trouble-
shooting. Valves and motors can be turned on and off from the UI.
How it happens:
In the gas fryer, line voltage is supplied to 24 volt transformers and 24-volt
power supplies. The transformer provides voltage for the spark module, gas
valve and the controller. The Smart Interface Board converts the voltage to DC and uses 12V for the
heat and latch relays; 5 VDC to power the sense circuits, 3.3 VDC for the processor. Voltage on the
board is marked by illuminated LED's.
The ignition circuit is like the H55: Latch and heat relays are operated by 12VDC from SIB; heat
relay closes when the temp probe, monitored by the SIB, shows low temp. The heat relay opens
when the temp probe is satisfi ed.
The boards that monitor oil levels and oil movement during fi ltration have little to do with regular
heating of the oil.
- The Filter Interface Board communicates with the SIB, the controller and the Valve Interface
Board to control top off and automatic intermittent fi ltration. The SIB monitors the Automatic Top
Off probe, the highest probe in the vat, and calls for top off oil, when that probe doesn't sense oil.
- The VIB monitors a lower probe, the VIB (AIF in earlier LOV fryers) , during automatic fi ltering
cycles. The VIB probe must sense oil for the fryer to resume heating at the end of a fi lter cycle.
- In most models (Taco Bell is the exception) an additional safety, the Oil is Back or OIB, also pre-
vents the fryer from heating until it is satisfi ed.
All the circuit boards work in unison to monitor the oil temperature, keep the vats topped off and
ensure the oil is fi ltered. (See the circuit board pictures and diagrams in this section.)
Th e Smart Interface Board
(SIB) is located behind the
touchscreen controller.
Touchscreen-Equipped Fryers
Critical Circuit Boards and Th eir Locations
Th e Valve Interface Board
(VIB) is located under
each vat. Replacement
boards come encased in
sheet metal.
5-2
Vid Video Content C t t
Compare touchscreen fryers
to legacy units.
Th e Filter Interface Board
(FIB) is in a box with other
components behind the JIB.
Th e box also contains the
SUI communication board
and power supplies for the
top off pump and the com-
munication components.