Filtering Sequence of Operation

Prompts

Filter cycles for each vat are initiated through the F5 control panel using different prompts. For Express Filter cycles, the user may be prompted for a filter cycle automatically by the control, or choose to initiate one on their own. Daily Filter cycles are only able to be initiated manually.

Control Initiated Filter

After a maximum number of accumulated cook cycles for a particular vat, the F5 control system will prompt the user to perform an Express Filter. At this time, the user can accept the prompt by tapping YES or decline by tapping NO. Upon tapping YES the Express Filter cycle will begin. Should the user tap NO, then they will be able to proceed with the ability to cook. However, after declining a filter prompt the user will then be prompted to Express Filter again after a reduced number of cook cycles. After the Express Filter is performed, the cook cycle tracking is reset to zero.

User Initiated Filter

Express Filter and Daily Filter cycles are able to be initiated manually by navigating to the Oil & Filter control menu. It is recommended that a user manually initiate an Express Filter before a normal busy period in the day's operation. Daily Filter cycles are intended to be performed once per day, generally before opening or early in the day. However a user may initiate the longer Daily Filter cycle at any point.

Filter Lockout

A different form of control initiated filter prompt is the Filter Lockout feature. When activated, Filter Lockout will force a user to filter after declining a certain number of control initiated prompts. When Filter Lockout occurs the user is not able to start another cook cycle on that vat until it has performed an Express Filter.

Filter Pan Switch

After the user initiates a filter cycle, the F5 control system first checks to verify the filter pan is in place. Filter pan position is confirmed through a circuit from the OMS PCB through a normally open magnetic proximity switch and back to the OMS PCB. A 12 volt DC signal sent from the OMS PCB to the magnetic proximity switch. With the filter pan fully inserted, the magnetic proximity switch is actuated closed by the filter pan's magnet, and the 12 volt DC signal returns to the OMS. If the filter pan is not fully inserted, the magnetic proximity switch is in its normally open state and the 12 volt DC signal does not return to the OMS. The filter pan switch circuit must be closed before the filter cycle can progress to the drain step.

• Normally open magnetic proximity switch

• Filter pan switch is actuated closed with pan inserted

Selector Valve

Orientation of the selector valve to the vat being filtered occurs as the first filter cycle action. By first rotating the selector valve to the proper vat position this allows for immediate pump oil flow and reduces filter idle time. The selector valve is a rotary valve with a fixed body and inner spool that rotates. Selector valve bodies have four (4) SAE-12 inlet ports and four (4), six (6), or ten (10) SAE-8 outlet ports. Each outlet port has an associated number engraved in the valve body. The number of selector valve outlet ports depends on the F5 fryer's vat configuration. Home position for the selector valve is Port 1 which is always plumbed to the bulk dispose line.

Rotation and positioning of the selector valve inner spool is provided by a motor/encoder assembly. To rotate the selector valve spool a 24 volt DC signal is sent from the OMS PCB to the selector valve motor. As the selector valve motor rotates, a pulsing 5 volt DC encoder position signal is returned to the OMS. Once the desired selector valve position is confirmed, the OMS PCB removes the 24 volt DC signal, and the motor stops rotating. The selector valve motor will rotate in either direction to achieve the desired position with shortest travel. The OMS PCB reverses 24 volt DC rotation signal polarity to change motor direction.

The selector valve spool and its motor/encoder shaft are connected by a mechanical coupling. A cast aluminum housing mounts the motor/encoder and coupling on top of the selector valve. Three (3) button head screws secure the motor/encoder housing to the selector valve body.

Drain

During the drain sequence, a 24 volt DC signal is sent from the OMS PCB to the drain valve actuator which causes the valve to open. With the drain valve open, cooking oil to be filtered flows by gravity from the vat to the drain trough and then to the filter pan. Immediately after the drain valve opens the filter pump motor energizes which recirculates the drained oil in a wash cycle to remove product crumbs that may have collected in the vat. A 24 volt DC signal in the opposite polarity is sent from the OMS PCB to the drain valve actuator to close the valve. Mechanical limit switches internal to the drain valve actuator provide position feedback to stop rotation when opening or closing.

• 24 volt DC signal to open drain valve

• Opposite polarity 24 volt DC signal to close drain valve

Filter Pan

Collecting and filtering drained oil is handled by the filter pan assembly which consists of a cover, crumb basket, filter pad, filter pad holder, and filter screen. As oil flows down through the filter pan assembly, crumbs and particulate are captured allowing filtered oil to to be returned to the vat. Filtered oil is able to return from the filter pan through a bottom mounted suction tube which connects to the fryer filter pump plumbing and is sealed by three o-rings. A gasket on the filter pan lid assembly reduces overall exposure to oil vapors and migration during the drain process. The filter pan assembly has four floor glides which resist developing flats and allow it to be transported when empty.

Filter Pump/Motor

Returning filtered oil from the pan is performed by the filter pump which is moved by a line voltage AC, single-phase, 1/2 HP (0.37 kW) electric motor. Line voltage is continually supplied to the OMS PCB for the filter pump motor and ATO pump. When the F5 control system energizes the filter pump motor, an OMS PCB mounted relay closes, sending single-phase line voltage to the motor.

NOTE - Single-phase electric motors rotate in one direction only. The filter pump motor rotates clockwise (CW) as viewed from the motor's rear face with reset button. If viewing the filter pump motor from the output shaft end, rotation will be in the counterclockwise or anticlockwise (CCW or ACW) direction.

The filter pump input shaft connects directly to the motor shaft and the pump body is mounted to the motor hub, secured with three (3) set screws. Orientation of the filter pump may be changed by loosening the set screws and rotating the pump body as needed. Inlet and outlet port sizes are SAE-12 with a required fitting o-ring seal, washer, and jam nut. The pump inlet side includes a 1/4 NPT plug for oil priming or inspection as needed. Oil flow is generated by PTFE rollers that are spun by the pump rotor that is permanently press fit to the input shaft. Filter pump outlet flow is a nominal 8 (US) gallons per minute (GPM) or 30 liters per minute (L/min).

NOTE - The filter pump body and cap have ribs cast as part their material and should always align on the same side. Ensure proper pump cap alignment after removal and reinstall.

NOTE - Never separate the filter pump rotor and body. Separating the rotor and body will cause permanent damage to the filter pump's non-serviceable shaft seal and require a complete pump replacement.

NOTE - Only use the filter pump to transport cooking oil. Using the filter pump to move water, cleaning solution, or other non-food rated material will cause contamination and/or permanent damage to the pump.

Wash/Polish

The wash and polish (Daily Filter only) sequences are used to recirculate the oil through the filter system to remove vat debris and oil particulate. During a wash or polish sequence the drain valve remains open with the filter pump energized to continually move oil from the filter pan to the vat which then drains back to the filter pan.

Fill

Filling of the vat after a filter cycle requires the drain valve to close with an opposite polarity 24 volt DC signal, and the filter pump to remain energized to return oil from the filter pan. Oil from the filter pump passes through a one-way return check valve before entering the vat. The return check valve requires an oil pressure of 2 PSI (138 mbar) to open and allow oil flow. Otherwise, the return check valve remains closed to prevent oil back flow through the fryer plumbing. The F5 control system detects a filled vat by sensing increased temperature readings from the main and level RTD probes to the PMU PCB. Having a vat filled with oil and temperature increase readings, the OMS PCB opens the board mounted relay stopping single-phase line voltage to the pump motor.

• Opposite polarity 24 volt DC signal to close drain valve

• Return check valve requires 2 PSI (138 mbar) to open

• Increased RTD temperature probe readings indicate filled vat to the PMU PCB

  • PMU PCB sends vat full CAN message to OMS PCB

• OMS PCB filter pump motor relay opens stopping single-phase line voltage