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High-tech and tradition – ZUM FRANZISKANER

Line of Busi-ness:

Commercial Refrigeration

Application: Gastronomy cooling

Country / City: Germany / München

Fluid:

Product: Slimline unit cooler GDF, Wall/ceiling unit cooler GHF, Drycool-er GFH

Zum Franziskaner

Already in 1363, even before Columbus dis-covered America, the Franziskaner existed inthe heart of Munich – at that time as goodneighbour of the Franziskaner monastery. Nowtoday, for 36 years, the Reinbold family with120 employees as well as a 20-head kitchenbrigade, look after the culinary well-being

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of the Franziskaner’s guests. The traditionalBavarian fare of the restaurant is a feature thatattracts international guests from industry andpolitics, art and science.

What does a LON-WORKS bus system have todo with a litre of beer? And how does EduardReinbold, landlord of the traditional Munichrestaurant ZUM FRANZISKANER know, evenwhen on the road, whether the famous Lowen-bräu and Franziskaner beer or the ingredientsfor his tasty Munich delicacies are perfectlycooled? heatXchange shows how a high-techcooling system can be combined with real Mu-nich tradition.

Delivery of the aircooler at the time of the Munich Opera Festival

After around three years under reconstruc-tion, Munich’s most traditional restaurant ZUMFRANZISKANER celebrated in April a quite spe-cial topping-out ceremony: Its home, only afew metres away from the opera house and inview of the distinguished Munich Frauenkirche,shone in new brilliance after restoration andthe addition of new buildings. Thus the tra-ditional restaurant offers on around 2,000square metres space for numerous hospitalityrooms inside and outside as well as completelynew building services. The cooling system es-pecially stood in the foreground in the redesignof the services, for this indeed guarantees theperfect storage of the famous Bavarian tradi-tional beer and the wide range of ingredientsfor Munich’s specialities: from the fresh whitesausage up to the authentic roast pork.

Customized cooling system

The demand of the client was clearly defined:“We want to offer our guests our customaryhigh traditional quality in the future, too. There-

fore we rely on an extremely modern and atthe same time extendable cooling system”.This was achieved in coordination between theSchindler Ingenieurgesellschaft Munich – theplanning consultants for the overall services– and the authorized Savel-Kühlung company,a refrigeration specialist with extensive expe-rience in the brewery and catering trade. Incooperation with experts from control and in-strumentation engineering through energy op-timization up to plant design, a total coolingsystem tailored perfectly to the demands of theFRANZISKANER was designed.

Delivery by truck and bringing in bycrane directly at the Munich Opernplatz

Refrigeration for food and drinks

The contractor decided after consultation withthe Schiessl wholesale company to equip theFRANZISKANER with components from threeproduct lines of the Güntner company, to fulfilall the requirements of modern catering in sev-eral versions. Thus the latest ceiling mountedevaporators and air coolers from Güntner wereused in the basement of the FRANZISKANERfor the optimum storage of food and drinks.Three evaporators of the GDF series are usedsolely for the drinks in several storage rooms;in the beer and soft drinks area at a room tem-perature of +1.5 °C, in the wine cellars at tem-peratures of +16 and +18 ºC. Six further ver-sions of the GDF were installed for vegetable re-frigeration, kitchen preparation and daily stor-age as well as for disposing of leftovers. Three

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aircoolers from the GHF series perform theirduty in the refrigerating areas for meat prod-ucts from the restaurant’s own butcher’s shopas well as for the day cooling cell of the mainkitchen to keep the sensitive products fresh intemperature ranges between 0 ºC and +2 ºC.

Vessel, barrel and tank cooling with drink line directly to the bar

The entire heat from refrigeration is dischargedthrough a drycooler of the GFH series installedon the roof of the building in the Perusas-traße. The constant regulation and fan moni-toring installed ex works on the aircooler savesa great deal of installation and wiring expensehigh up on the roof and thus costs. The con-tractor smiles, satisfied: “Even delivery in thepedestrian precinct, bringing in by crane onFriday night at twelve o’clock and installationon the structure produced according to theequipment drawing went perfectly.”

Bar with taps arranged directly above the cooling cell

Decentralized control and intercommunica-tion

The building services installations areequipped with decentralized, specialized con-trollers and communicate through an openbus system, the LON data bus. Thus the clas-sical multi-wire parallel wiring of all signal andcontrol cables is replaced by one data cable.Components of different manufacturers andtrades can be combined to suit the buildingand united to form a single system with the aidof the LON data bus. In the FRANZISKANER thisconcerns the refrigeration for the 12 coolingcells and for the refrigeration registers of theair conditioning systems. The kitchen waste air,the heating plant and the sanitary installationsare also monitored by it.

Even if things get hot in the kitchen, the meat for the roastpork remains fresh with the aid of the efficient GHF aircooler.

The highly efficient refrigeration plant of theFRANZISKANER is equipped with constant-ly controlled compressors, refrigeration con-trollers at the places of use and constantfan control on the air blast cooler. Thanksto LON-Mark, the communication protocol in-dependent of manufacturer, all componentsspeak and understand the same language.Thus there can be an interchange of informa-tion and this can be visualized jointly on on-ly one user interface. A central Internet serv-er unites the data flow with the aid of prod-uct-independent software (e.g. tocata). Specialprogramming knowledge is not necessary forthis. The plant is configured using this soft-ware. There is an identification button on thefield bus coupler on the components of com-pressor, refrigerator and drycooler controller.

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The components are detected and integratedby pressing the button. On expansion of thesystem, components are integrated simply inthe existing LON network.

If the energy signal lamp switches to red, mainenergy consumers are switched off by the chef.

Not only quality, functionality and handlingmust be right, but also the costs. The ener-gy management system available for the en-tire building also speaks the LON language andpermits the exchange of data. This data flowsinto the recording and evaluation system andforms the basis for energy cost optimization.The energy signal lamp installed in the centralstaff working area is symbolic for the energycost consciousness of the operator.

The dumplings as garnishing for the roast pork can bestacked up to just below the ceiling thanks to the GDF.

Building services by remote call

All operating states, switching times and set-points can be called up through any PC withInternet browser, thus also in the office of themanaging director. The FRANZISKANER’s own-er is constantly up to date even when on theroad. If required, the operating states are trans-mitted by telephone modem as SMS messageto his mobile phone. A protected Internet ac-cess allows even changes to switching times

and setpoints at different levels by telecon-trol. Naturally these possibilities are also avail-able to the refrigeration engineer. Settings rel-evant for operation can be made only by therefrigeration system builder. Service calls aremade more efficient. FRANZISKANER host Ed-uard Reinbold summarizes: “This sophisticat-ed technology combines high-tech with tradi-tion in the FRANZISKANER: The system can beadapted perfectly to the high demands of ourguests and I have the costs under control.”

Relevance of refrigeration plant controlselectroniccontrols

electronic controlswith bus system

mechanicalcontrols

1960 1970 1980 1990 2000 2010 year

Relevant forbusiness success

LonMark certificate assures interoperability

Bus technology is developing more and moreas the standard in refrigeration as well. Espe-cially the large food chains, but also cateringand food processors require open system so-lutions on the basis of internationally custom-ary bus standards. By doing away with theclassical parallel wiring of all signals, investorsand users expect a reduction of the cabling ex-pense, smaller control cabinets, higher flexibil-ity, simpler extensions as well as new function-alities for saving energy and operating costs.Now that the LonWorks technology has provenits efficiency in building automation, a similardevelopment in refrigeration and air condition-ing is now becoming apparent.

By contrast to the bus systems originatingfrom electronics with relatively long processingtimes, the LON technology shows its speed andhigh efficiency even in complex control and in-strumentation tasks. In addition there is thefreely designable topology with maximum buslengths of 900 m and stub lines of up to 3 m

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to the individual LON devices. In the meantimeLON users have compiled so-called profiles forthe different applications under the umbrellaof LonMark Interoperability Association.

Only in this way can the much quoted interop-erability across manufacturers’ boundaries beachieved. Interoperability therefore exists onlyif all directives of the LonMark InteroperabilityAssociation are complied with and the productis identified with the LonMark logo as certifi-cation symbol. The refrigeration industry haslearned quickly from the rather difficult startin the LON world and has submitted severalprofile drafts for certification, e.g. for refriger-ation point controllers, condenser controllersand compressor controllers. Güntner partici-pates in this development by an active role inthe refrigeration and air conditioning workinggroup of the LON user organization (LNO). Internet adresses:www.lno.de/ak/kktwww.lonmark.org