•The operator attempted to filter oil that was not heated. Cold oil is thicker and causes the pump motor to work harder and overheat.
If the motor hums but the pump does not rotate, there is a blockage in the pump. Incorrectly sized or installed paper will allow food particles and sediment to pass through the filter pan and into the pump. When sediment enters the pump, the gears can bind up and cause the motor to overload, tripping the thermal overload. Solidified shortening in the pump will also cause it to seize, with similar results.
A pump seized by debris or hard shortening can usually be freed by manually moving the gears with a screwdriver or other instrument as illustrated on the following page. Make sure power to the pump motor is off before trying this.
1.Disconnect power to the filter system.
2.Remove the input plumbing from the pump.
3.Use a screwdriver to manually turn the gears.
•Turning the pump gears backwards will release a hard particle and allow its removal.
•Turning the pump gears forward will push softer objects and solid shortening through the pump and allow free movement of the gears.
PUMP |
Sediment |
Particle |
Up for |
reverse |
FLOW |
Down for |
forward |
Filter paper/pads that are installed incorrectly will also allow food particles and sediment to pass through and clog the suction tube recess on the bottom of the filter pan or the suction tube, itself. Particles large enough to block the suction tube recess or the suction tube may indicate that the crumb tray is not being used.
The electronics of the FootPrint PRO system, illustrated in the schematic on the following page, are simple and straightforward.
Microswitches, which are attached to handles for each vat and wired in parallel, provide the 24 VAC required activating the pump relay coil when the
handles are moved to the ON position. The activated pump relay coil pulls in the pump motor switch, supplying power to the pump motor.
Verifying Solenoid Operation |
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Proper operation of the 24 VAC manifold and | 24 VAC |
| |
pump solenoids can be verified by removing |
|
the pump motor lead from terminal 4 of the |
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pump motor relay in the filter wiring box and | Solenoids |
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then activating the oil return lever. Proper |
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solenoid operation will be evidenced by an | |
| |
audible “click” or vibration of both the pump | Pump Relay Coil |
solenoid and the manifold solenoid. | Pump Motor |
| |
| M |
| Pump Motor Switch |
| FootPrint PRO Schematic |
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