8196446 - Frymaster

1.12 RTI Service Issues
1.12.1 RTI MIB Tests
The LOV fryer will ONLY operate with RTI systems that have the new RTI updated
three-pole float switch. If the float switch is the older two-pole switch, call RTI. These
float switches are polarity specific which may short to ground and damage an MIB
board.
Normal measurements (MIB J6 8-pin connector with everything connected)
AC voltage measurements:
Pin 1 to Pin 2 - 24 VAC.
Pin 2 to Pin 8 - 24 VAC when waste tank is full, 0 VAC when it is not full.
Pin 2 to Pin 3 - 24 VAC when RTI fill pump is on, 0 VAC when it is off.
Using the RTI test box, PN# 108-0716 allows a quick and easy way to check the 24VAC, the waste
full switch and when the RTI pump is operating.
Troubleshooting
All return and drain valves should be closed and pump should be off while the MIB is resetting. If any
of the valves or the pump is on during reset, the MIB board is bad or wires are shorted.
JIB solenoid is not opening:
Take these readings when the JIB valve is in the open position:
1. Reset the power; wait 60 seconds and see if the valve opens.
2. Check voltage at ATO board on J8. Pin 9 to Pin 16 should be 24 VAC.
RTI pump is not operating or JIB is not filling:
See page 1-26 to ensure that no other function is taking priority over adding oil to jug.
With the JIB button pressed:
1. Voltage at MIB board from Pin 1 to Pin 2 should be 24 VAC; if not, check connections from RTI
24VAC transformer and check transformer.
2. Voltage at MIB board from Pin 2 to Pin 3 should be 24 VAC; if not, the MIB board is bad or wires to
pump relay are shorted or both.
3. Voltage at Add pump relay should be 24 VAC; if not, check wiring from MIB board. The relay is
located on top of RTI system.
Waste full signal:
Pin 2 to Pin 8 should be 24 VAC when full, 0 VAC when not full; if no voltage level change, the
connection from RTI switch or MIB board is bad.
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