Abstract:
A fryer system and method of extending oil life in fryer pots by minimizing the effects of oxygenization, hydrolysis and lack of oil replenishment during the cook cycle. The fryer system includes a controller that controls an on time and an off time of the fryer pots according to a use schedule. The use schedule levels or equalizes the on time use among all of the fryer pots. The controller includes a processor that executes instructions stored in a memory to control the on time use and off time use of the fryer pots as well as the use of filtration based on an elapse of a predetermined number of cook cycles of a stopped fryer pot since the oil was last filtered.

Description:
RELATED APPLICATION 
       [0001]    This application claims priority to U.S. Provisional Application No. 61/665,184, filed on Jun. 27, 2012, the entire contents of which are hereby incorporated herein. 
     
    
     BACKGROUND OF THE DISCLOSURE 
       [0002]    1. Field of the Disclosure 
         [0003]    The present disclosure relates to a fryer system and method of extending cooking oil life in fryers by minimizing the effects of oxygenation, hydrolysis and lack of oil replenishment during the cooking cycle. 
         [0004]    2. Description of Related Art 
         [0005]    Cooking oil, sometimes referred to as fat or shortening, used in deep fat frying is both the method of heat transfer and the substance absorbed by the fried product which provides the taste and “mouth feel” that makes deep fat fried foods so universally popular. However, wasted oil discarded due to deterioration during the deep fat frying process costs the restaurant industry millions of dollars each year. One of the problems with oil is deterioration in the fryer pot over a period which varies from a few days to a few weeks and since the deteriorated oil contributes a bad taste to the food and is unhealthy if ingested, it must be discarded. Frying oil is considered unfit for human consumption when any one of a number of attributes exceeds limits set by the individual restaurant or by various governmental bodies. The three most common attributes which restaurants monitor are Free Fatty Acids (FFA), Total Polar Materials (TPM), and Color. All of these attributes are relevant to the determination as to the state of deterioration of the oil. However governmental regulation currently is primarily focused on Total Polar Materials and Free Fatty Acids. While the discard value of oil may be as much as 30% of its initial value due to its use in bio-fuel production, the cost of fresh non-trans fat oil may approach $1.00/pound. So the opportunity for saving oil waste is very large. 
         [0006]    Most efforts to extend oil life have centered on various filtering processes which involve frequent filtering or the use of sophisticated and expensive filter aids. Mechanical filtering processes have proved only marginally effective at extending oil life and do not solve the overall oil deterioration problem. The reason that filtering is not the ultimate solution can be easily understood is that the crumb sized byproducts of frying are not the primary cause of oil deterioration. Most of the harmful byproducts of cooking exist at a molecular level and cannot be easily removed by mechanical means. While mechanical means of removal are not always effective, there exist other methods. 
         [0007]    Certain filter aids have proven to be effective in removing some of the harmful cooking byproducts by adsorption. The best filter aid thus far tested is composed of magnesium silicate which is considered essential when filtering. Unfortunately it also absorbs a certain amount of oil which is discarded each time the filter is discarded. However, the positive effects of the use of magnesium silicate filtration significantly outweigh the cost of the oil discarded. Nevertheless, to this point, no one has understood how to completely address the oil deterioration problem and/or provided an organized, manageable, and effective regimen which can actually be used in a restaurant environment to solve the problem. 
         [0008]    The primary three factors that contribute to oil deterioration and degradation are 1) oxygenation, 2) hydrolysis and 3) lack of a sufficiently high oil turnover ratio to offset the degraded oil that results from oxygenation and hydrolysis. 
         [0009]    Oxygenation of the oil is accelerated by the oil being maintained at high temperatures. Oil deteriorates at an exponentially increasing rate as oil temperature increases. In the restaurant environment, peak fryer food cooking capacity is not needed at all times. Therefore, there is an opportunity to either turn off or reduce to an idle mode fryers that are not needed. Having unneeded fryers turned off or in an idle mode, reduces oil deterioration due to elevated temperatures. 
         [0010]    Further, the rate of oxygenation is proportional to the surface area of the oil and as previously stated increases exponentially as the temperature of the oil rises. The rate of deterioration of oil at 335 degrees is approximately 36% higher than the rate of deterioration at 290 degrees but is slightly more than double the 290 degree rate at 360 degrees. 
         [0011]    Further, deterioration of oil due to oxygen is not significantly affected by the cooking process. So fryer pots sitting idle at temperature (depending subtly on other conditions) will frequently deteriorate faster than fryer pots in which cooking occurs due to the lack of any oil turnover. The time a fryer pot is exposed to air multiplied by an appropriate temperature factor can be termed “oxygen minutes.” Controlling the oxygen minutes is very important in minimizing the negative effects of both high heat and air exposure. The coordination of the off, idle and cooking modes in the store environment and taking advantage of the reduced cooking capacity to minimize oil deterioration must be optimized. 
         [0012]    Further, during the cooking process moisture is introduced into the oil (hydrolysis) from the nature of the cooking process. Saturation levels of moisture in the oil are obtained quickly, and often after just a single cook cycle. Unfortunately, high moisture levels require several hours to naturally return to acceptable moisture levels. The capacity of oil to hold dissolved water, its saturation level, theoretically increases as the oil temperature increases. But as a practical matter during actual cooking tests, the observed concentration of water in oil was: 
         [0000]                                            Cooking Temperature   Water Content                           290 F.   .148%           335 F.   .106%           360 F.   .085%           Fresh Oil   .018%           After 10 minutes polish filter   .011%                        
Further, the ability of oil to retain dissolved water increases as the oil deteriorates. Therefore there is a tendency once the oil starts to deteriorate for the process to accelerate as each step in the deterioration process leads to even more water retention during the next cook cycle. Water that is dissolved in cooking oil cannot boil away. In contrast, such oil must evaporate. While boiling occurs within a liquid, evaporation only takes place at the surface. Therefore, evaporation is a very slow process that can take hours. The minimization of “water minutes” the percentage of water present in oil multiplied by the number of minutes that the water is present is achieved in the disclosed process. In the context of a commercial cooking environment, cooking sporadically in several fryers has the end result of keeping the moisture levels high in all of the fryers in a system without any intervention.
 
         [0013]    Accordingly, focused cooking in specific fryers limits high moisture levels to a minimum number of fryers and therefore reduces the system rate of deterioration in the fryers due to moisture. A further method of minimizing deterioration due to moisture levels in cooking oil is to quickly remove moisture from the oil in the fryer pot once such fryer pot is placed in an idle status. 
         [0014]    Removal of water from oil is critical because, while, after the oil becomes saturated further cooking does not result in any additional water buildup. Therefore, actively removing moisture from the oil prior to an extended period of non-cooking will reduce the rate of deterioration due to moisture, and necessarily before placing the fryer in idle mode. However, as previously noted the water will remain in the oil for a long time if not removed. 
         [0015]    The third factor that greatly reduces the oil quality is lack of fresh replacement oil that is returned to the fryer pot. During the cooking process, cooking oil is gradually removed from the fryer and absorbed into food, removed by utensils and daily filtration and cleaning. The removal and replacement of the oil that is deteriorated by oxygenation and hydrolysis addressed previously and replaced by fresh non-deteriorated oil acts to improve the overall condition of the oil in the fryer pot. A measure of the oil replacement is called the turnover ratio and is calculated by dividing the daily quantity of oil removed from the fryer by the total fryer capacity. Higher turnover ratios improve the quality of the oil in the fryer. The way to solve the oil life problem is to either improve the refresh rate or lower the deterioration rate or affect both so that the rate of deterioration is offset by the rate of refreshment. The turnover ratio is most effectively improved by reducing the oil capacity of the fryer and by using a low oil volume fryer and limiting the rate of deterioration with regard to oxygenation and moisture retention. 
         [0016]    For example, a 50 pound fryer pot with a replacement rate of 6 pounds per day would have a turnover ratio of 12%. A 30 pound fryer pot with the same 6 pound replacement rate per day would have a turnover ratio of 20%. This sort of turnover ratio difference is significant. The higher the turnover ratio, the greater is the salutary effect on the overall process. The equilibrium thus achieved extends the oil life so that it is constantly being refreshed by new oil and served to the customer before it deteriorates beyond its useful life. 
         [0017]    Fryer pot rotation is necessary to assure that each fryer pot deteriorates and is rejuvenated in an equal manner over time. The reason this is important is that under normal conditions all fryer pots are filtered through a single filter each day. If one fryer pot is allowed to deteriorate at a higher rate than the others it will cross contaminate the other fryer pots due to the residue left behind having a catalytic effect on the other fryer pots when they are filtered through the same filter pad. This cross contamination by the most seriously deteriorated fryer pot has the effect of accelerating the deterioration of the less deteriorated fryer pots, thus dragging down the entire system. In addition, as previously mentioned as oil deteriorates its capacity to dissolve higher percentages of water is increased. 
         [0018]    The present disclosure has recognized that efficient use of cooking oil for even cooking in each fryer pot of a fryer system achieves optimal quality of food cooked in each fryer pot of the fryer system. Optimal oil life is achieved when the deterioration level in oil in all fryer pots in the system is consistent and minimized. Accordingly, there is a need for a control system and process for tracking the deteriorated state of oil in each fryer pot and for adjusting the cooking and filter schedule to account for differences of oil quality. Further, there is a need to minimize the negative impacts on cooking oil of excessive elevated temperature, oxygenation, moisture, lack of oil turnover ratio, and filtration of cooking oil to minimize deterioration of oil in a system of fryer pots. 
       SUMMARY OF THE DISCLOSURE 
       [0019]    An embodiment of the fryer system of the present disclosure comprises a plurality of fryer pots and a filtration system that filters oil used in the fryer pots. A controller controls an on time use and an off time of the fryer pots according to a use schedule that levels the on time use among the plurality of fryer pots over a period of two or more days. 
         [0020]    In another embodiment of the fryer system of the present disclosure, the on time use of the fryer pots is equalized over the period. 
         [0021]    In another embodiment of the fryer system of the present disclosure, the use schedule rotates the on time use of the fryer pots from one to the next of the days. 
         [0022]    In another embodiment of the fryer system of the present disclosure, the on time use of two or more of the plurality of fryer pots overlaps one another during a rush time. 
         [0023]    In another embodiment of the fryer system of the present disclosure, any of the plurality of fryer pots that is not presently being used is controlled to an off status or an idle status. 
         [0024]    In another embodiment of the fryer system of the present disclosure, the controller arranges for the filtration system to filter oil contained in one of the fryer pots that is not presently in use based on an elapse of a predetermined number of cook cycles of the one of the fryer pots since the oil was last filtered. 
         [0025]    In another embodiment of the fryer system of the present disclosure, the controller further arranges for the oil to be cycled several times through the one of the fryer pots in a polishing process to remove water from the oil. 
         [0026]    In another embodiment of the fryer system of the present disclosure, the controller comprises a processor that executes instructions stored in a memory to control the on time use and the off time of the plurality of fryer pots. 
         [0027]    In another embodiment of the fryer system of the present disclosure, each of the fryer pots comprises a user interface and local controller. The processor communicates prompts to the user interfaces for the operator to initiate actions via the local controller to control the associated fryer pot, the actions including turn on, turn off, oil filtration, polish oil and/or add new oil. 
         [0028]    In an embodiment of method of the present disclosure for a fryer system that comprises a plurality of fryer pots and a filtration system, the method comprises: 
         [0029]    executing instructions with a processor for control of an on time use and an off time of the fryer pots according to a use schedule that levels the on time use among the plurality of fryer pots over a period of two or more days; and 
         [0030]    sending prompts to an operator of the fryer system to turn the fryer pots on and off and to start and stop a filtering of the oil of a stopped fryer pot. 
         [0031]    In another embodiment of the method of the present disclosure, the method further comprises: 
         [0032]    generating a prompt for filtering the oil of an off time fryer pot based on an elapse of a predetermined number of cook cycles of an off time fryer pot since the oil was last filtered. 
         [0033]    In another embodiment of the fryer system of the present disclosure, the method further comprises: 
         [0034]    after filtering, polishing the oil of the off time fryer pot. 
         [0035]    The present disclosure further provides for a fryer system including a plurality of fryer pots, and a controller that manages the filtration and on/off status of such fryer pots according to a schedule stored in the controller such that when the instructions are executed, a cooking process is enabled that emphasizes the intense use of each fryer pot while it is heated in order to optimize the turnover ratio of cooking while minimizing the heated minutes of the oil and the hydrolysis of the oil to minimize degradation due to heat exposure and water saturation. Each individual fryer pot coordinates all cooking activities such as menu items, cook temperatures and safety operations related to the heating system of the fryer pot. 
         [0036]    The present disclosure further provides for a fryer system and methodology that provides for at least two fryer pots that have periods of overlapping use during predetermined rush periods, such as at lunch and dinner. In the non-rush periods of lower fryer pot usage, one of the two fryer pots is brought out of service to minimize the effects of excessive heat, hydrolysis and oxidation that such oil is exposed to during the cooking process. The present disclosure provides for different protocols that cover cooking periods including 12, 18 and 24 hours. 
         [0037]    The present disclosure further provides for a fryer system and methodology that includes at least three fryer pots that have periods of overlapping use during predetermined and prescheduled rush periods, such as during lunch and dinner. In the non-rush periods, two of the three fryer pots are taken out of use to minimize the effects of excessive heat, hydrolysis and oxidation that such oil is exposed to during the cooking process. The present disclosure provides for different protocols that cover cooking periods including 12, 18 and 24 hours. The fryer pot that is first used each day is rotated to ensure that such first used fryer pot on a following day receives the benefit of a new filter, rejuvenated oil and a clean filter. 
         [0038]    The present disclosure further provides for a fryer system and methodology that includes at least three fryer pots that have periods of overlapping use during predetermined and prescheduled rush periods, from lunch through dinner. In the non-rush periods, two of the three fryer pots are taken out of use to minimize the effects of excessive heat, hydrolysis and oxidation that such oil is exposed to during the cooking process. During the rush periods, at least two fryer pots are on to maintain cooking capacity and one fryer pot is off. The present disclosure provides for different protocols that cover cooking periods including 12, 18 and 24 hours. The fryer pot that is first used each day is rotated such that no fryer pot of the three is first used on successive days. By rotating the first fryer pot, such first used fryer pot on a day receives the benefit of a new filter, rejuvenated oil and a clean filter. 
         [0039]    The present disclosure further provides for a fryer system and methodology that includes at least three fryer pots that have use during predetermined and prescheduled rush periods, from dinner through closing. In the non-rush periods, two of the three fryer pots are taken out of use to minimize the effects of excessive heat, hydrolysis and oxidation that such oil is exposed to during the cooking process. During the rush periods, at least two fryer pots are on to maintain cooking capacity and one fryer pot is off. The present disclosure provides for different protocols that cover cooking periods including 12, 18 and 24 hours. The fryer pot that is first used each day is rotated such that no fryer pot of the three is first used on successive days. By rotating the first fryer pot, such first used fryer pot on a day receives the benefit of a new filter, rejuvenated oil and a clean filter. 
         [0040]    The present disclosure further provides for a system including a plurality of fryer pots, and a controller that manages the filtration and scheduling of such fryer pots according to a schedule stored in the controller such that when the instructions are executed a cooking process is enabled that emphasizes the intense use of first and second pots during a predetermined period of time and then deactivates such fryer pots and commences cooking in a third fryer pot during a shorter period of time than the first predetermined period of time for a total cooking time of 12 hours. At the start of a next 12 hour period, the first fryer pot that was used during the first predetermined period of time is reserved for later use during the shorter period of time that begins after the first predetermined period of time. Simultaneously, the fryer pot that was used during the shorter period of time, the third fryer pot, is used during the first predetermined long period of time along with the second fryer pot. The benefit that is achieved by rotating the first fryer pot to the later cooking period is that the second fryer pot that is used at the start of the second twelve hour time period receives a new filter that automatically absorbs some of the cooking oil in the fryer pot so that the oil will have to be replenished due to the decreased oil volume. 
         [0041]    The present disclosure further provides for a method of maintaining optimal quality in a deep fryer system of the type having a housing with at least first and second fryer pots that are sized to hold a quantity of cooking liquid for cooking a food product. The fryer system contains a filtration system that is configured to filter cooking liquid of the first and second fryer pots during operation and a controller that supplies signals to the filtration system and to the first and second fryer pots, the controller having a computer readable medium having computer executable instructions that when executed implement a method stored on a processor. The method includes the steps of: a) providing a signal to a controller of the first fryer pot that prompts a user to commence cooking in the first fryer pot; b) receiving a signal that activates the first fryer pot and begins operation of a heat source to maintain a supply of oil in the first fryer pot at a predetermined temperature for a predetermined time to cook the food product during a cooking cycle; c) assessing the need to filter the cooking oil in the first fryer pot based on a signal that is received; and wherein if i) the signal is above a predetermined threshold, sending a signal to commence a filtration cycle in the first fryer pot and sending a signal to a controller of the second fryer pot to prompt a user to commence a cooking cycle in the second fryer pot; and if ii) the signal is below a predetermined threshold, sending a signal to the controller of the second fryer pot to prompt a user to commence a cooking cycle in the second fryer pot or continue the cooking cycle; and d) wherein the first fryer pot and the second fryer pot are simultaneously in operation until a signal is received to commence a filtration cycle in the first fryer pot or the second fryer pot. 
         [0042]    The present disclosure requires a determination of a minimum number of fryer pots that are used and heated at a given time thereby eliminating the oxidation of oil in fryer pots which are simply sitting idle, preventing hydrolysis of unneeded fryer pots due to casual loading, and maximizing the turnover of oil in fryer pots which are being heavily used. 
         [0043]    The present disclosure further provides for a system and method that polishes the oil in a fryer pot as soon as intense period of heating in a fryer pot has ceased. Polishing rapidly cycles the cooking oil through the filtration system for a predetermined period of time and eliminates water from such oil and cools the oil that is pumped through filter and fryer plumbing. Polishing immediately stops the exposure of cooking oil to water and therefore minimizes the negative effects of water and rapidly cools the oil to minimize the exposure of the oil to elevated temperatures. The fryer pot is then allowed to cool further naturally and remains in that state until its next scheduled period of use. 
         [0044]    Therefore, it is essential to also rotate the dynamic overlapping process between each fryer pot in the system for load leveling purposes. This rotation is necessary to assure that each fryer pot deteriorates and is rejuvenated in an equal manner over time. 
         [0045]    In carrying out the principles of the present invention, in accordance with a preferred embodiment thereof, a deep fat frying apparatus and method of operation is provided in which oil management functions including the transfer of oil, oil polishing/filtration, and the fill and dispose functions are automated by means of a control system which has electric motor operated valves to control the flow of oil, exposure of fryer pots to heaters, moisture, and oxidation. The disclosure provides for a control system for tracking the deteriorated state of oil in each fryer and adjusting the cooking and filter schedule to account for differences, based on exposure of oil in a fryer pot to elevated temperature, moisture and oxidation. 
         [0046]    The present disclosure includes a control system that communicates between all fryer subsystems and user interface components to extend oil life resulting in lower oil cost due to minimization of deteriorating conditions. By minimizing exposure to deteriorated oil conditions, consistent food quality remains in the optimum quality range for TPM, FFA and color for a longer period of time. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0047]    Other and further benefits, and advantages and features of the present disclosure will be understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference characters denote like elements of structure. 
           [0048]      FIG. 1  is a perspective view of the fryer system showing a the housing with three fryer pots, that implement the method of the present disclosure; 
           [0049]      FIG. 2  is a rear perspective view of a fryer pot according to the present disclosure; 
           [0050]      FIG. 3  illustrates a further perspective view of a fryer pot according to the present disclosure; 
           [0051]      FIG. 4  illustrates various components of a portion of the plumbing system according to the present disclosure; 
           [0052]      FIG. 5  illustrates a schematic diagram of the computer and processor for executing the instructions to carry out the methodology of the present disclosure; 
           [0053]      FIG. 6   a  illustrates a schematic diagram showing the fryer pots and the master control function of the several fryer pots, according to a first embodiment of the control system of the present disclosure; 
           [0054]      FIG. 6   b  illustrates a schematic diagram showing an alternative configuration of the control of the several fryer pots according to the present disclosure; 
           [0055]      FIGS. 7   a  through  7   c  illustrate a cooking schedule for a system having two fryer pots that is implemented by a method of the present disclosure; 
           [0056]      FIG. 7   d  illustrates a flow chart for carrying out the schedule of  FIGS. 7   a  through  7   c.    
           [0057]      FIGS. 8   a  through  8   c  illustrate a cooking schedule, featuring heavy lunch and dinner schedule, for a system having three fryer pots that is implemented by a method of the present disclosure; 
           [0058]      FIGS. 9   a  through  9   c  illustrates a cooking schedule, featuring a heavy cooking schedule from 11 am until 7 pm, for a system having three fryer pots that is implemented by a method of the present disclosure; 
           [0059]      FIGS. 10   a  through  10   c  illustrates a cooking schedule, featuring a heavy cooking schedule from 5 pm until 12 am, for a system having three fryer pots that is implemented by a method of the present disclosure; 
           [0060]      FIGS. 11   a  through  11   c  illustrate a cooking schedule, featuring a heavy cooking schedule from 5 am until 12 pm, for a system having three fryer pots that is implemented by a method of the present disclosure; 
           [0061]      FIG. 12  illustrates a flow chart that shows the process of the fryer system the implements the schedule of  FIGS. 8   a  through  8   c ,  FIGS. 9   a  through  9   c ,  FIGS. 10 through 10   c  and  FIGS. 11   a  through  11   c ; and 
           [0062]      FIG. 13   a  shows a comparison between total polar materials present in a contaminated store unit and a store unit using a schedule according to the present disclosure; and 
           [0063]      FIG. 13   b  is a graph of a comparison of the percentage of free fatty acids between a contaminated store unit using a schedule according to the present disclosure. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0064]    Referring to  FIG. 1 , a front perspective view of a fryer system is shown, and generally referred to by reference numeral  10 . Fryer  10  has a housing  15  and three fryer pots  20 ,  25  and  30 . Pots  20 ,  25  and  30  each contains oil for deep frying foods commonly used in the commercial food industry. Fryer  10  has a controller  48  that controls each fryer pot  20 ,  25  and  30 . Controller  48  is in communication with fryer pots  20 ,  25  and  30  via fryer controllers  35 ,  40  and  44  to maintain overall control of fryer system  10 . Each controller  35 ,  40 , and  44  has a user interface  52  with a display panel that is capable of showing text, lights for instruction and conveying signals to user. 
         [0065]    Housing  15  contains a heating system comprising individual gas or electric heaters. Heaters are conventional heaters which are operated and controlled by controllers  35 ,  40  and  44  associated with each fryer pot. It will be understood throughout that the term oil or cooking oil refers to any liquid cooking medium, including melted shortening or even water for cooling vat systems for pasta, for example. 
         [0066]    Housing  15  also contains a filtration system that is able to intermittently fill and filter oil in fryer pots  20 ,  25  and  30 . Housing  15  and, in particular, each fryer pot contains sensors that are able to sense position of oil in fryer pot and replenished oil to each fryer pot. Housing  15  also has a new oil reservoir  60  and an indicator lamp  65  operatively associated with oil reservoir  60 . Oil reservoir  60  uses new non-filtered oil to supply fryer pots  20 ,  25 , and  30 . Further the doors can also be opened and used for periodic maintenance necessary for commercial cooking systems. While housing  15  is shown having three fryer pots, the housing could contain as few as two and as many as twelve fryer pots depending upon the needs of the food service professional. Fryer pots  20 ,  25  and  30  are preferably low oil volume fryer pots of 30 pounds, although standard sized fryer pots may also be used. 
         [0067]    Referring to  FIGS. 1 ,  2  and  3 , fryer pot  20  has a drain valve  155  that is opened and closed by one of a pair of actuators  130 . Beneath fryer pot  20  is a drain manifold  56  that collects oil from drain valve  155 . Manifold  56  collects oil from each drain valve in fryer system  10 . Oil passes from drain manifold  56  to a crumb basket via downspout. After oil passes through a crumb basket, such oil is deposited in filter pan  73 . Oil is pulled or pumped through a filter pad and a filter screen located in the bottom of filter pan  73 . 
         [0068]    Referring to  FIG. 2 , an individual fryer pot  20  is shown. Fryer pots  25  and  30  of  FIG. 1  each have the same elements and function as fryer pot  20 . Fryer pot  20  has gas fired burners  22  for heating oil in a cooking area  100 , although other methods of heating could also be used. Fryer pot  20  also has an oil level sensor  105 , an optional safety backup submersible oil level sensor  106  and top off oil inlet  107 . Fryer pot  20  also has a fryer high limit probe  108 , an auxiliary heater probe heater  109  and a fryer temperature probe  111 . Submersible sensors  105  and  106  may be bimetallic thermal sensors but could also be continuous temperature referencing sensors. 
         [0069]    As shown in  FIG. 3  and  FIG. 6 , fryer pot  20  has a drain valve  155  driven by one of a pair of actuators, for example, linear motion motors  130  to drain used oil from fryer pot  20 . Fryer pot  20  also has a pipe system  125  that feeds used oil into fryer pot  20  via an oil return valve  140  driven by the other of the pair of linear motion motors  130 . Fryer pot  20  has a remotely located solenoid valve  135  and pump  160  associated therewith that operates to feed new oil to fryer pot  20  through pipe system  165  terminating at top off inlet  107 . System  10  has three solenoid valves  135 ,  145  and  150 . Solenoid valves  145  and  150  are operatively connected to fill fryer pots  25  and  30 , respectively, in response to submersible temperature sensors disposed in those fryer pots. Pump  160  uses a vacuum, pressure or centrifugally driven filtration process. The filtration process and oil transport activities can be automated through main controller  48  and executed by a user based on prompting or text instructions at each individual controller  35 ,  40  and  44 . 
         [0070]    Pipe system  165  is separate from pipe system  125  that feeds used oil to fryer pot  20 . Pipe system  165  is in communication with new oil reservoir  60 . Pipe system  165  is in fluid communication with reservoir  60 , whereas piping  125  is in fluid communication with pan  73 . 
         [0071]    As shown in  FIG. 1 , new oil reservoir  60  may be a single tank, an interconnected series of tanks, a drum or any source of new oil. Reservoir  60  is in electrical communication with controller  48  to supply oil depending upon needs of a fryer pot  20 ,  25  and  30 . For example, if an oil level in a particular fryer pot is low due to oil use, or a particular fryer pot needs rejuvenation due to deterioration, such controller would send a signal to supply pump  160  and valve to supply new oil to a particular fryer pot. The presence or level of oil in fryer system  10  can be based on temperature systems, pressure sensors, visually, with optic methods, heat dispersion, vibration or acoustic methods, although temperature sensors are presently disclosed. Independent of the method used, the level of oil in a fryer pot is conveyed to controller  48 , which communicates with pump  160  and return valve  76 , to maintain the oil level to a proper level in fryer pot  20 ,  25  or  30 . Fresh oil reservoir  60  can be located inside fryer system  10  or remotely. 
         [0072]    Filter pan  73  and valves  135 ,  145 , and  155  and pump  160  support a polishing filtration function. The polishing filtration function occurs after a fryer pot is brought out of service by controller  48  once such fryer pot is not needed during a particular schedule. The polishing function is effective to remove water from cooking oil by passing used cooking oil for several minutes through the filtering system. As discussed previously, this process eliminates not only particulate matter, but significantly, minimizes water in the cooking oil. While a specific fryer pot has been described, the present methodology can be executed on fryer pots having a different configuration. 
         [0073]    In addition to filter pan  73  that mechanically filters oil flowing through fryer system  10 , non mechanical means are also usable within the scope of the present system. Filter aids such as magnesium silicate can be used to absorb certain harmful byproducts in addition to the filter in filter pan  73 . While magnesium silicate absorbs a certain amount of oil which is discarded each time filter is discarded, beneficial effects of using magnesium silicate filtration significantly outweigh the cost of the oil discarded. 
         [0074]    Significantly, when new oil is introduced into a single fryer pot,  20 , for example, other fryer pots  25  and  30  benefit because the new oil will improve the net condition of the oil in the entire fryer system  10  because such new oil has the benefit not having particulate impurities, moisture, oxidation or repeated exposure to elevated temperatures. This new oil will ultimately be used in other fryer pots after the filtration process. 
         [0075]      FIG. 6   a  shows a schematic diagram of fryer system  10 . Fryer system  10  has a master controller  48  that controls fryer pots  20 ,  25  and  30  via fryer control  35 ,  40  and  44 , respectively. Controller  48  coordinates all on and off times of fryer pots  20 ,  25  and  30  according to a predetermined schedule that is stored in a memory contained in controller  48 . Further controller  48  manages all filtering operations of filtration system  11  according to the predetermined schedule. 
         [0076]    Referring to  FIG. 5 , shows controller  48  includes a user interface  52 , a processor  80 , and a memory  85 . Controller  48  may be implemented on a general-purpose microcomputer. Controller  48  can accept various settings, such as, for example, temperature and timing settings. Controller  48  is capable of counting the number cook cycles processed in fryer pot  20 . Although controller  48  is represented herein as a standalone device, it is not limited to such, but instead can be coupled to other devices (not shown) via a network. 
         [0077]    Processor  80  is configured of logic circuitry that corresponds to and executes instructions to perform functions of present disclosure. 
         [0078]    Memory  85  stores data and instructions for controlling the operation of processor  80 . Memory  85  may be implemented in a random access memory (RAM), a hard drive, a read only memory (ROM), or a combination thereof. Components of memory  85  are program modules  90  through  93 , for example. The term “module” is used herein to denote a functional operation that may be embodied either as a stand-alone component or an integrated configuration of a plurality of sub-component components. Thus, program module may be implemented as a single module or as a plurality of modules that operate in cooperation with one another. Moreover, although program modules are described herein as being installed in memory  85 , and therefore being implemented in software, it could be implemented in any of hardware (e.g. electronic circuitry), firmware, software, or a combination thereof. Further, while program modules are indicted as already loaded into memory  85 , it may be configured on a storage medium for subsequent loading into memory  85 . Storage medium  63  can be any conventional storage medium that stores program module thereon in tangible form. Examples of storage medium  63  include a floppy disk, a compact disk, a magnetic tape, a read only memory, an optical storage media, universal serial bus (USB) flash drive, a digital versatile disc, or a zip drive. Alternatively, storage medium  63  can be a random access memory, or other type of electronic storage, located on a remote storage system and coupled to controller  48  via a network  64 . 
         [0079]    Scheduling module  90  stores the several cooking routines or schedules of the present disclosure that activate (turn on) and bring out of service (turn off) service fryer pots  20 ,  25  and  30  according to a predetermined sequence as will be described below. Program module  91  includes instructions related to menu items, cook temperatures and safety operations related to the fryer pot  20 . Similarly, program modules  92  and  93  contain corresponding instructions for fryer pots  25  and  30 , respectively. Processor  80  executes the instructions of program modules  91 ,  92  and  93  to control oil for fry pots  20 ,  25  and  30 , respectively. 
         [0080]    A program module  95  includes instructions to manage oil filtration of fryer pots  20 ,  25  and  30  and the opening and closing of valves and pumps. Accordingly, program module  95  counts the number of cook cycles registered in each fryer pot, includes instructions for communicating electronically with sensors in each fryer pot to monitor positioning of oil in each fryer pot, controlling motors and valves associated with each fryer pot and supplying oil to each fryer pot as needed. Program module  95  also includes instructions for managing the fill operation in each fryer pot to rejuvenate oil that is lost during the fryer process. Processor  80  executes the instructions of program module  95  for automatic control or manual control (via prompts) by an operator. 
         [0081]    User interface  52  includes an input device, such as a keyboard or speech recognition subsystem for enabling a user to communicate information and command selections to processor  80 . User interface  52  also includes an output device such as a display or printer to display text or other visual information to a user for instructional or status indication purposes. Additional function buttons or displays with text messages, audible alarms associated with displays and status lights as indicated in  FIG. 1  above the number buttons, can be used to alert or inform the operator to perform a particular action or function. 
         [0082]    Processor  80  provides outputs to user interface  52  based on execution of the instructions of program modules  90 ,  91 ,  92 ,  93  and  95  of the methods described herein. 
         [0083]    Alternatively, and as shown in  FIG. 6   b , a fryer pot control, such as of fryer pot  20  incorporates a master control function that is able to control other fryer pots  30  and  35 , for example. 
         [0084]    Referring to  FIG. 7   a ,  FIG. 7   b  and  FIG. 7   c , three different cooking schedules for a two fryer pot system are shown and described. A system, such as the one shown in  FIG. 1  (with two fryer pots), guides a user via controller  48  to cook in designated fryers by a system of indicators, and to place fryers in an idle mode from a cook mode via indicators/text according to a predetermined cook capacity schedule, lights. As discussed previously, controller  48  controls overall functions such as cook scheduling function, fryer pot status (on/off, idle, in use, for example), whereas individual controls on each fryer pot manually control oil cooking/heating functions based on prompts provided by controller  48 . 
         [0085]    Cooking capacity requirements in many restaurants are known to have peaks at morning breakfast time, midday lunch time, and again for the evening meal time. Accordingly, in an exemplary system with two fryers, a schedule incorporating two available fryers during peak time is always maintained to address peak demand scenarios and once a peak demand period has passed, to quickly return to a single deep fryer by returning a non-used fryer to idle mode quickly after peak time has passed. Fryer system  10  also accommodates unforeseen scenarios such as a sudden increase in demand for additional fryer pots that can be quickly brought online by a process of rotating fryer pots in use after oil in such fryer pots has been treated or replenished. 
         [0086]    In a venue with two fryer pots  20  and  25 , various schedules according to the present disclosure are disclosed for cooking the same product. The various schedules represent a typical 12 hour store or product availability schedule, an 18 hour schedule and a twenty four hour schedule. 
         [0087]    Referring to  FIG. 7   a , a pre-programmed schedule for a 12 hour day is shown. In a venue with two fryer pots, in a 12 hour cycle, that begins at lunchtime Period A, for example, two fryer pots  20  and  25  would be brought into service on Day 1. The user would be prompted with for example a light on user interface of control  35  and control  40 , to turn on each fryer pot  20  and  25 . In Period A, a period of high demand, two fryer pots  20  and  25  are required. After a predetermined rush period of approximately two hours, fryer pot  25 , for example, would be automatically turned off by a signal sent from controller to fryer pot  25 . After fryer pot  25  is turned off, controller  48  sends a signal to fryer pot  25  commence a filtration cycle. In keeping with the present disclosure, controller  48  manages the filtration cycle of fryer pot  25 . During the filtration cycle, controller  48  sends signals to motors  130  that open drain valve  155  and return valve  140  of fryer pot  25 . Controller  48  also sends a signal to motor  130  and pump  160  to enable a pump (not shown) to cycle oil through fryer pot  25  several times. This rapid pumping of oil through fryer pot  25 , termed polishing, eliminates water from such oil and cools the oil that is pumped through filter and fryer plumbing. Polishing takes approximately from 7 to 15 minutes at the close of each cooking cycle. Polishing immediately stops the exposure of cooking oil to water and, therefore, minimizes the negative effects of water and rapidly cools the oil to minimize the exposure of the oil to elevated temperatures. Fryer pot  25  is then allowed to cool further naturally and remains in an off state until its next scheduled period of use. 
         [0088]    Fryer pot  20  remains in a cooking mode until dinner rush period, Period B, is completed at approximately 7 pm. From 11 am to 7 pm, fryer pot  20  has been on for 8 hours. During this time period, cooking oil has been absorbed by the food product as part of the cooking process. Accordingly, during this 8 hour time period new oil is supplied to replenish oil in fryer pot  10 . The oil is replenished based upon readings from sensors in fryer pot  20  that monitor position of cooking. Replenishment of oil helps to refresh the oil and minimize the effects of water and oxidization of the oil, in fryer pot  20  and fryer pot  25  that is also in use. 
         [0089]    At Day 2 of  FIG. 7   a , fryer pot  25  is controlled to function as fryer pot  20  on Day 1 and fryer pot  20  is controlled to function as fryer pot  25  of Day 1. By effectively switching positions on alternate days, even use of cooking oil is maintained. Because fryer pots  20  and  25  use the same filtration system, even use of cooking oil must be maintained so that neither fryer pot is cross-contaminated by excessive TPMs, or excessive water or particulate matter from the other fryer pot. 
         [0090]    Referring to  FIGS. 7   b  and  7   c , fryer pots  20  and  25  are used for 18-hour days and 24 hour cooking days respectively. Their cooking cycles are substantially similar to the cooking schedules of the 12 hour cooking schedule highlighted above with respect to  FIG. 7   a . The only difference between  FIG. 7   a  and  FIGS. 7   b  and  8   c  is that the breakfast period is extended in  FIG. 7   b  and the breakfast and dinner periods are extended in  FIG. 7   c.    
         [0091]    In  FIG. 7   b  and  FIG. 7   c , fryer pot  20  and fryer pot  25 , are turned on at 5 am. In  FIG. 7   b , fryer pots  20  and  25  are turned off at 11 pm. In the 24 hour schedule shown in  FIG. 7   c , fryer pots  20  and  25  are rotated in and out of service to maintain cooking availability. 
         [0092]    However, there exist times when a schedule such as the one shown in  FIGS. 7   a  through  7   c  is not used or for unforeseen reasons, such as excessive demand, that a different method may be used. 
         [0093]    The flow chart shown in  FIG. 7   d  shows how operation that is unplanned would function according to the present disclosure. Fryer pot  20  and fryer pot  25  are brought in and out of service during the intense rush of lunchtime and dinner time. In periods which typically experience minimal demand, only a single fryer pot is used to minimize exposure of cooking oil to elevated temperatures and to avoid the deleterious effects of the cooking process noted previously. It should be noted that if an emergency situation occurs where additional fryer capacity is required that the process allows for an unscheduled fryer to be heated. However, as soon as the emergency situation is over the fryer pot should be processed through the shutdown process of turning off the heat, polish filtering and shutdown. 
         [0094]    In  FIG. 7   d , the diamonds labeled  251  indicate “fryer on”, the diamonds labeled  252  indicate “fryer maintenance (e.g., filtration), and the diamonds labeled  253  indicate fryer off. As an example, the diamonds are so labeled only in  FIG. 7   a  for day 1 of a typical 12 hour store or product available cycle. Thus, fryer pots  1  and  2  are both turned on at 11 am as indicated by diamonds  251 . Fryer pot  1  stays on until 7 pm and is then turned off as indicated by diamond  253 . Fryer pot  2  is turned off at 1 pm as indicated by diamond  253  and turned on again at 5 pm as indicated by diamond  251  and turned off again at 11 pm. When turned off, the diamonds  252  indicate that the turned off fryer pot is available for maintenance such as filtration and/or polishing, if required. 
         [0095]    In a venue with two fryer pots  20  and  25 , controller  48  supplies the user with a prompt to turn on power to fryer pot  20 . An indicator, such as an LED, is illuminated on user interface  52  of fryer pot  20  at controller  35  to indicate that an action is required from user at step  205 . At step  210 , the user turns on fryer pot  20  to cook a desired food product. Individual fryer pot  20  (and  25 ) is programmed with menu items and specific cook temperatures (set points) and times, as noted above. At step  215 , user interface  52  of fryer pot  20  provides an indication, such as by a green LED, that fryer pot  20  is prepared to cook because the cooking oil has reached the preset temperature. At step  220 , fryer pot  20  cooks food products for a period of time and temperature of oil in fryer pot remains at preprogrammed set temperature to cook the food product. At step  225 , computer  48  (or user if in manual mode) determines if fryer pot  20  should be shut down or if cooking should continue based upon the number of cooking cycles that have elapsed. The decision is based on the oil quality and the current needs in the restaurant environment. If controller  48  determines that a predetermined number of cook cycles has elapsed, an affirmative result will commence a filtration cycle at step  230 . If on the other hand, the oil in fryer pot  20  is adequately free of impurities and a single fryer pot is still required, use of such fryer pot is still needed at step  250 , cooking will continue at step  220 . If a second fryer pot is needed at step  250 , controller  48  sends a signal to the user at step  255  requesting the user to turn on fryer pot  25 . At step  260 , fryer pot  25  is turned on. At step  265 , oil is heated in fryer pot  25  and when the oil reaches a predetermined set point temperature, a light on user interface  52  of fryer pot  25  is illuminated indicating that oil in fryer pot  25  is at a predetermined set temperature for cooking. 
         [0096]    The food is cooked in fryer pot  25  at step  270 . At step  275 , computer  48  (or user if in manual mode) determines if fryer pot  25  should be shut down or if cooking should continue based upon the number of cooking cycles that have elapsed. The decision is based on the oil quality and the current needs in the restaurant environment. If controller  48  determines that a predetermined number of cook cycles has elapsed, controller  48  sends a signal to fryer controller  40  that illuminates an LED indicating to the user that a filtration cycle must commence at step  280  for fryer pot  25 . At step  285 , user activates filtration cycle. At step  290 , fryer pot  25  may be turned off, such as at the end of a cooking day, or placed in an idle mode for further use. If on the other hand, the oil in fryer pot  25  is adequately free of impurities and a single fryer pot is still required cooking, fryer pot  25  is needed at step  275 , cooking will continue using fryer pot  25  at step  270 . 
         [0097]      FIG. 8   a  through  FIG. 8   c  illustrate cooking schedules of three fryer pot In a venue with three fryer pots, various schedules according to the present disclosure are disclosed for cooking the same product. The various schedules represent a typical 12 hour store or product availability schedule, and 18 hour schedule and a twenty four hour schedule. Controller  48 , as described with regard to  FIGS. 7   a  through  7   c , controls overall functions such as cook scheduling function, fryer pot status (idle, in use, for example), whereas individual controls  35 ,  40  and  44  control oil monitoring/testing functions, cooking/heating functions, in each fryer pot  20 ,  25  and  30 . 
         [0098]    According to  FIG. 8   a , a 12 hour cooking cycle, the schedule is executed according to a pre-programmed schedule. As noted previously, memory  85  stores data and instructions for use by processor  80  controlling the operation of system  10 . Processor  80  is configured of logic circuitry that corresponds to and executes instructions to perform the functions of the present disclosure. 
         [0099]    In a venue with three fryer pots, in a 12 hour cycle, that begins at lunchtime Period A, for example, fryer pots  20  and  25  would be turned on by the user. The user would be prompted with, for example, a light on user interfaces  52  to turn on each fryer pot  20  and  25 . During rush period, two fryer pots  20  and  25  are required. After a predetermined rush period of approximately two hours, fryer pot  25 , for example, would be automatically turned off by a signal sent from controller  48  to controller  35 . After fryer pot  25  is turned off, controller  48  sends a signal to fryer pot  25  to commence a filtration cycle. In keeping with the present disclosure, controller  48  manages the filtration cycle of fryer pot  25 . During the filtration cycle, controller  48  sends signal to motors  130  that open drain valve  155  and return  140  valve of fryer pot  25 . Controller  48  also sends a signal to motor (not shown) and to enable a pump (not shown) to cycle oil through fryer pot  25  several times. This rapid pumping of oil through fryer pot  25 , termed polishing, eliminates water from such oil and cools the oil that is pumped through filter and fryer plumbing. Polishing immediately stops the exposure of cooking oil to water and therefore minimizes the negative effects of water and rapidly cools the oil to minimize the exposure of the oil to elevated temperatures. Fryer pot  25  is then allowed to cool further naturally and remains in an off state until its next scheduled period of use. 
         [0100]    Fryer pot  20  remains in a cooking mode until dinner rush period, Period B, is completed approximately at approximately 7 pm. From 11 am to 7 pm, fryer pot  20  has been in use for 8 hours. During this time period, such oil has been replenished based on readings from sensors that monitor position of cooking oil. Replenishment of oil helps to freshen the oil and minimize the effects of water and oxidization of the oil. 
         [0101]    At dinner rush, Period B, two fryer pots must be in service to accommodate the necessary increased load of consumers. Accordingly, controller  48  executes instructions that automatically bring fryer pot  30  into use, cooking oil is heated and is available for cooking food product. After the two hour time period of Period B, fryer pot  20  is brought out of service so that such oil contained in such fryer pot is filtered. Several hours later, at 11 pm, fryer pot  30  is brought out of service and oil in fryer pot  30  is filtered. 
         [0102]    On Day 2 of  FIG. 8   a , fryer pots  25  and  30  are turned on, and fryer pot  20  is not turned on until 5 pm. In other words on Day 2, fryer pot  20  is controlled by controller  48  to take the position that fryer pot  30  occupied on Day 1, fryer pot  25  is controlled by controller  48  to take the position that fryer pot  20  had on Day 1 and fryer pot  30  is controlled by controller  48  to take the position that fryer pot  25  had on Day 1.  FIG. 8   a  shows that the first fryer pot used on successive days is not the same. The first fryer pot used is rotated from Day 1, to Day 2 and to Day 3. The benefit of rotating the first fryer pot used in a day, such as fryer pot  25  on day 2, is that such fryer pot obtains the benefit of lowered volume of oil and a clean filter. The benefit of the lowered volume of oil means that such fryer pot will receive new oil to replenish such oil that was lost to the filter. 
         [0103]    On Day 3, again the position of the fryer pots is shifted so that fryer pot  20  and fryer pot  30  are used and fryer pot  25  starts at 5 pm for cooking during Period B. 
         [0104]    Referring to  FIGS. 8   b  and  8   c , three fryer pots are used for 18-hour days and 24 hour cooking days, respectively. The cooking cycles are substantially similar to the cooking schedules of the 12 hour cooking schedule highlighted above with respect to  FIG. 8   a . The only difference between  FIG. 8   a  and  FIGS. 8   b  and  8   c  is that the breakfast period is extended in  FIG. 8   b  and the breakfast and dinner period is extended in  FIG. 8   c . In  FIG. 8   b , the breakfast begins at 5 am. In the evening in  FIG. 8   c , dinner extends until 3 am and the fryer pots are constantly in rotation operating during an entire 24-hour period. 
         [0105]    Similar to  FIGS. 8   a  through  8   c ,  FIGS. 9   a  through  9   c ,  10   a  through  10   c  and  11   a  through  11   c , three fryer pots are in a preprogrammed cooking rotation or schedule that is stored in memory  85  of controller  48 . 
         [0106]    In  FIGS. 9   a  through  9   c , such a schedule is used in environments that have a lunch rush and dinner rush lasting from 11 am to 7 pm during which at least two and eventually three fryer pots  20 ,  25  and  30  are in operation.  FIG. 9   a  is a 12 hour product availability cycle;  FIG. 10   b  is an 18-hour product availability cycle and  FIG. 9   c  is a 24 hour availability cycle. 
         [0107]    In  FIGS. 10   a  through  10   c , such as schedule is used in an environment that has a heavy evening demand from 5 pm to 12 am for example. Again during this period, all three fryer pots  20 ,  25  and  30  may be in operation to accommodate consumer volume.  FIG. 10   a  is a 12 hour product availability cycle;  FIG. 10   b  is an 18-hour product availability cycle and  FIG. 10   c  is a 24 hour availability cycle. 
         [0108]    In  FIGS. 11   a  through  11   c , such as schedule is used in an environment that has a heavy breakfast demand from 5 am to 12 pm for example. Again during this period, all three fryer pots  20 ,  25  and  30  may be in operation to accommodate consumer volume.  FIG. 11   a  is a 12 hour product availability cycle;  FIG. 11   b  is an 18-hour product availability cycle and  FIG. 11   c  is a 24 hour availability cycle. 
         [0109]    The flow chart shown in  FIG. 12  shows how operation that is unplanned would function according to the present disclosure in a system with three fryer pots. Fryer pot  20 , fryer pot  25  and fryer pot  30  are brought in and out of service during the intense rush of lunchtime and dinner time. In periods which typically experience minimal demand, only a single fryer pot is used to minimize exposure of cooking oil to elevated temperatures and to avoid the deleterious effects of the cooking process noted previously. It should be noted that if an emergency situation occurs where additional fryer capacity is required that the process allows for an unscheduled fryer to be heated. However, as soon as the emergency situation is over the fryer should be processed through the shutdown process of turning off the heat, polish filtering and shutdown. 
         [0110]      FIG. 12  shows a flow chart that describes how a non-programmed venue with three fryer pots would operate. At step  500 , controller  48  supplies power to fryer pot  20 . An indicator, such as an LED, is illuminated on user interface (of fryer pot  20 ) to indicate that an action is required from user. At step  505 , user turns on fryer pot  20  to cook a desired food product. Individual fryer pots  20 ,  25  and  30  are programmed with menu items and specific cook temperatures (set points) and times, as noted above. At step  510 , user interface  52  of fryer pot  20  provides an indication, such as by a green LED, that fryer pot  20  is prepared to cook because cooking oil has reached preset temperature. At step  515 , fryer pot  20  cooks food products for a period of time and temperature of oil in fryer pot  20  remains at the preprogrammed set temperature to cook the food product. If processor  80  determines that a filtration cycle is necessary at step  520 , processor  80  sends a signal to controller  30  indicating that an automatic filtration cycle should commence. At step  530 , the user commences a filtration cycle. At step  535 , fryer pot  20  can be placed in a turned off or in an idle mode. The decision is based on the oil quality and the current needs in the restaurant environment. If the computer  48  determines that a predetermined number of cook cycles has elapsed, an affirmative result will commence a filtration cycle at step  230 . 
         [0111]    If, on the other hand, the oil in fryer pot  20  is adequately free of impurities and a single fryer pot is still adequate as determined at step  525 , cooking will continue at step  520 . If a second fryer pot is needed at step  525 , controller  48  sends a signal to control  40  that illuminates a light of control of fryer pot  25  to prompt an action by user at step  600 . At step  605 , the user turns on fryer pot  25 . At step  610 , oil is heated in fryer pot  25  and a light on user interface  52  of fryer pot  25  is illuminated indicating that oil in fryer pot  25  is at a predetermined set temperature for cooking. 
         [0112]    At step  615 , fryer pot  25  cooks food products for a period of time and the temperature of oil in fryer pot  25  remains at a preprogrammed set temperature to cook the food product. If processor  80  determines that a filtration cycle is necessary at step  620 , controller  48  sends a signal to controller  40  indicating that an automatic filtration cycle should commence. At step  625 , controller  40  provides an indication on the associated user interface  52  for the user to begin an automatic filtration cycle. At step  630 , the user commences a filtration cycle. At step  635 , fryer pot  25  can be placed in a turned off mode or in an idle mode. The decision is based on the oil quality and the current needs in the restaurant environment. If the processor  80  determines that a predetermined number of cook cycles has not elapsed, or that fryer pot  25  is still needed and two fryer pots are adequate, cooking will continue in fryer pot  25  at step  620 . 
         [0113]    Cooking can continue with a third fryer pot  30  according to the methodology highlighted above. At step  700 , processor  80  sends a signal to illuminate a light on user interface  52  of fryer pot  25  indicating to the user that fryer pot  25  is needed. Accordingly, at step  705 , the user turns on fryer pot  25 . At step  710 , oil is heated in fryer pot  25  and a light on user interface  52  of fryer pot  25  is illuminated indicating that the oil in fryer pot  25  is at a predetermined set temperature for cooking. 
         [0114]    At step  715 , fryer pot  30  cooks food products for a period of time and the temperature of oil in fryer pot remains at a preprogrammed set temperature to cook the food product. If processor  80  determines that a filtration cycle is necessary at step  720 , controller  48  sends a signal to controller  44  indicating that an automatic filtration cycle should commence. At step  725 , controller  44  provides an indication for the user to begin automatic filtration cycle. At step  730 , the user commences a filtration cycle. At step  735 , fryer pot  25  can be placed in a turned off mode or in an idle mode. The decision is based on the oil quality and the current needs in the restaurant environment. If the processor  80  determines that a predetermined number of cook cycles has not elapsed, or that fryer pot  30  is still needed and three fryer pots are adequate, cooking will continue in fryer pot  30  at step  720 . While fryer pot  30  is cooking, fryer pots  20  and/or fryer pot  25  may be taken out of service. 
         [0115]    On the following day, the first fryer to begin cooking is fryer  25 , to take advantage of the benefits of a new filter and lowered volume of oil. 
         [0116]    In keeping with the present disclosure, controller  48  manages the filtration cycle of fryer pots  20 ,  25  and  30  for a three fryer pot system. During a filtration cycle, controller  48  sends signals to motors  130  that open drain valve  155  and return valve  140  of fryer pot  20 . Controller  48  also sends signals to motor [what motor?] and pump  160  to enable pump  160  to cycle oil through fryer pot  20  several times. This rapid pumping of oil through fryer pot  20 , termed polishing, eliminates water from such oil and cools the oil that is pumped through filter and fryer plumbing. Polishing immediately stops the exposure of cooking oil to water and therefore minimizes the negative effects of water and rapidly cools the oil to minimize the exposure of the oil to elevated temperatures. Fryer pot  20  is then allowed to cool further naturally and remains in that state until its next scheduled period of use. Alternatively at step  240 , fryer pot  20  is turned off by controller  48 . 
         [0117]      FIG. 13   a  shows a comparison between total polar materials present in a contaminated store unit and a store unit using a schedule disclosed herein. 
         [0118]      FIG. 13   b  is a graph of a comparison of the percentage of free fatty acids between a contaminated store unit using a schedule disclosed herein 
         [0119]    While the instant disclosure has been described to incorporate electric actuators, either hydraulic or pneumatic actuators could also be used for opening and closing the drain and return valves of the instant disclosure. 
         [0120]    It should be understood that the foregoing description is only illustrative of the present invention. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present invention. Accordingly, the present invention is intended to embrace all such alternatives, modifications and variances.