Frymaster LOV - Troubleshooting

LOV
™
Technical Reference
28
RTI-equipped Systems
Some stores may be equipped with RTI oil storage systems. If so, some of the settings, wiring, and
troubleshooting may differ from normal LOV
™
fryer systems. (See next page for bulk oil wiring.)
The LOV
™
fryer will ONLY operate with RTI systems that have the new RTI updated three-pole fl oat
switch. If the fl oat switch is the older two-pole switch, call RTI. These fl oat switches are polarity
specifi c and 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 3 - 24 VAC when RTI add pump switch is on, 0 VAC when it is off.
- Pin 2 to Pin 4 - 24 VAC when RTI waste valve is on, 0 VAC when it is off.
- Pin 6 to Pin 7 - 24 VAC when RTI JIB valve is on, 0 VAC when it is off.
DC voltage measurements: Pin 1 to Pin 8 - 0 VDC when waste tank is full, 5 VDC when it is not full.
Troubleshooting
The valves and pump should be off while MIB is resetting, roughly 5 seconds after a power on or after pressing
the reset button; if any of the valves or pumps are on during reset then the MIB board is bad or wires are shorted.
If JIB valve is not opening, measure when JIB valve supposed to be open:
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 at RTI.
2. Voltage at MIB board from Pin 6 to Pin 7, should be 24 VAC; if not, check MIB board is
bad or wires to JIB valve are shorted or both.
3. Voltage at JIB valve, should be 24 VAC; if not, check wiring from MIB board.
If waste valve is not opening, measure when Waste valve is supposed to be open:
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 at RTI.
2. Voltage at MIB board from Pin 2 to Pin 4, should be 24 VAC; if not, check MIB board is
bad or wires to Waste valve are shorted or both.
3. Voltage at Waste valve, should be 24 VAC; if not, check wiring from MIB board.
If Add pump is not operating, measure when add pump is supposed to be on:
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 at RTI.
2. Voltage at MIB board from Pin 2 to Pin 3, should be 24 VAC; if not, check 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. Re-
lay located on top of RTI system.
Waste full signal: Pin 1 to Pin 8 should be 0 VDC when full, 5 VDC when not full; if no level
change, then the connection from RTI switch or MIB board is bad.
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