WO2012130743A2

WO2012130743A2 - Refrigerator

Info

Publication number: WO2012130743A2
Application number: PCT/EP2012/055170
Authority: WO
Inventors: Jan-Grigor Schubert; Georg Strauss
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-03-28
Filing date: 2012-03-23
Publication date: 2012-10-04
Also published as: CN103459946A; CN103459946B; WO2012130743A3; DE102011006258A1

Abstract

A refrigerator, in particular a domestic refrigerator, has at least one assembly (7, 9), which can be operated at different non-zero values of an operating parameter which influences the emission of noise, and has a control unit (10) which is designed to autonomously vary the value of the operating parameter in a first mode of operation. The control unit (10) can be switched over to a second mode, in which it operates the assembly (7, 9) with a single non-zero value of the operating parameter.

Description

The refrigerator

The present invention relates to a refrigerator, in particular a household refrigerator, for energy-efficient operation.

Ever increasing requirements for the energy efficiency of refrigeration appliances have led to various changes and innovations in the design and construction of refrigeration appliances and their assemblies. In order to improve the smooth running of the compressor in such a refrigeration device, thinner oils are used than hitherto. The resulting reduced damping of the moving parts of the compressor leads to an increased noise emission.

Silencers, which serve to suppress flow noise at the suction port of the compressor, cause a pressure drop that affects the efficiency of the compressor. If you want to reduce this pressure drop, you usually have to accept a lower sound damping effect.

An important factor affecting the energy efficiency of a refrigeration appliance is the interruption of operation of the compressor and, if present, the fan, which are required because the cooling capacity of the compressor during operation is higher than the actual refrigeration capacity of the refrigeration appliance. If there is a pressure equalization between different areas of the refrigerant circuit in a standstill phase of the compressor, then the pressure in the evaporator increases. This leads to an increase in the boiling point of the refrigerant therein, so that the cooling effect that would be achievable without this increase in pressure with the present when switching off the compressor in the evaporator liquid coolant is not or only partially realized. Also connected to the pressure equalization between condenser and evaporator flow of warm refrigerant to the evaporator affects its cooling effect. It is therefore desirable to reduce the frequency and length of cut-out phases of the compressor and possibly of a fan coupled to the operation of the compressor. This is possible through the use of compressors and / or fans with variable power. A change in the power of a compressor or fan is usually associated with a change in the operating frequency of its drive. In general, the faster the drive runs, the higher the noise emission of the compressor or fan. The amount of noise emitted by the complete refrigerator is additionally affected by the resonant frequencies of parts of the appliance. If the drive frequency of the compressor or fan coincides with such a resonance frequency of the device, it can lead to a considerable noise amplification even at low power. While it is sufficient to avoid or dampen resonances of the device at this fixed frequency in a refrigeration device whose compressor or fan each run only at a fixed frequency, the requirements for effective vibration suppression in a device whose compressor or fan at different Frequencies can work much higher. Even if a controller of the device permits operation of the compressor or fan only at a limited number of discrete stationary frequencies, other frequencies are continuously swept when switching between steady state values and resonances, if present, are excited.

All of these factors cause devices optimized for high energy efficiency generally to have a higher operating noise than conventional devices and, in particular, switching the compressor or fan of such a device between different power levels can result in the emission of noise that is annoying to a user be perceived.

It is an object of the present invention to provide a refrigerator which, despite high energy efficiency, effectively minimizes generation of user noise interfering with operation.

The object is achieved by a refrigeration appliance, in particular a household refrigeration appliance, having at least one assembly operable at different non-zero or non-standstill values of the operating parameter influencing the noise emission and a control unit which is set up in a first operating mode Operational parameters to vary autonomously, the control unit is switchable to a second mode, in which the control unit the Module with a single non-zero value of the operating parameter.

This value will generally be that among the various first variable settable non-zero values of the operating parameter which minimizes the noise emission of the device, or it will be selected at least among a plurality of respective relatively low values of noise emission corresponding parameter values. By causing the user to operate in the second mode at times when he feels disturbed by the operating noise of the refrigerator, a user is protected from a disturbing level of noise; At times when a user's malfunction is ruled out, for example because the user is not within earshot of the refrigeration appliance, the refrigeration appliance can and should be operated with high energy efficiency in the first operating mode. It may be expedient to select the non-zero value of the operating parameter with which the module is operated in the second operating mode as a function of an ambient temperature detected when entering the second operating mode. By e.g. At high ambient temperature, a value of the operating parameter is chosen which gives a slightly higher than the optimum operating noise level, but also a higher cooling performance than a lower ambient temperature selected value, it can be ensured that suitable storage conditions can be maintained even in the second operating mode ,

As in the manner described above controlled assemblies are in particular a compressor or a fan into consideration; an application to other noise generating assemblies, if any, is obviously also possible.

The operating parameter may in particular be a rotational speed or, in the case of a non-rotating drive, a frequency of a drive of the module.

The control unit is preferably set up to select the value of the operating parameter as a function of the ambient temperature in the first operating mode, and in particular to adapt it to changing ambient temperatures as long as the first operating mode is stopped. In contrast, preferably in the second operating mode The operating parameters are set only once based on the temperature detected during the transition to the second operating mode. Thus, the control can be kept simple in the second operating mode; The limited duration of the second operating mode nevertheless entails that the value of the operating parameter is updated from time to time and adapted to the ambient temperature.

A user interface may be provided to control the switching of the control unit between the modes of operation according to a user's wishes. The control unit can also have a time switching unit for switching over the operating modes in a time-controlled manner. The times at which this timer unit switches can be fixed, e.g. programmed by the manufacturer. Preferably, however, the timer unit is combined with the user interface to allow the user to set the switching times. Thus, a user can program times of day when he stays within earshot of the refrigerator as times of operation in the second operating mode.

Conveniently, the control unit is provided with memory space to store at least one daily or weekly recurring pattern of switching times and thus spare a user a frequent re-entry of the switching times. This memory location should preferably be of a type that also holds data stored in the event of a power failure, such as an EEPROM or a flash memory.

The user interface should also have a switching element for instant switching at least from the first to the second operating mode to allow the user to reduce the operating noise substantially immediately at any time when it is distracting, with immediate effect.

The second mode of operation will generally not be suitable for indeterminate operation, since the quietest mode of operation that meets this requirement will be determined by the manufacturer of the refrigerator as the first mode of operation. So that a user can not extend the second operating mode indefinitely by repeated actuation of the switching element, it can be provided that after one Return from the second to the first operating mode, a switch back to the second operating mode is temporarily disabled.

The same switching element or another switching element can serve to switch back to the first operating mode.

Preferably, the control unit is set up to switch back to the first operating mode at the latest after a predetermined maximum operating time has expired in the second operating mode. In this way, it is ensured that the refrigeration device operates at energy-saving times, at which the noise emission associated with the energy-saving operation does not disturb a user. Other criteria for switching back to the first mode of operation may be:

the opening and / or closing a door of the refrigerator. When the door has been opened, there is a high probability that fresh, warm refrigerated goods have been stored and that the cooling capacity available in the second operating mode is not sufficient to cool this refrigerated goods within a reasonable time. Moreover, the access to the door suggests that at least one user is awake in the environment of the refrigerator, so his sleep does not need to be protected by a low noise level of the refrigerator.

- Exceeding a temperature limit in a storage compartment of the refrigerator. This can e.g. happen when after the transition to the second mode, the temperature in the vicinity of the refrigeration device increases significantly and the operating parameter value selected at the beginning of the second operating mode no longer allows sufficient cooling.

In the event that the only non-vanishing value of the operating parameter specified for the second operating mode is not sufficient to maintain a storage area of the refrigeration appliance at a setpoint temperature, the control unit can be set up to switch over to a value of the operating parameter that corresponds to a higher cooling capacity if the temperature in the storage area exceeds a permissible maximum.

Such a changeover can in particular be due to switching back to the first operating mode. The maximum allowable temperature for the particular storage area may be adjustable by a user. Thus, the user may consider to what extent he is willing to accept temporary warming of the storage area for quiet operation.

Assemblies whose operation requires cooling power, such as an icemaker and / or a cold water dispenser should be expediently released for operation only in the first operating mode, but blocked in the second operating mode.

Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. 1 shows a schematic section through an inventive refrigeration device;

FIG. 2 shows a user interface of the refrigeration device in the first operating mode; FIG.

3 shows an alternative embodiment of the user interface;

FIG. 4 shows the user interface of FIG. 2 in a programming mode; FIG.

5 shows a flow chart of a working method which takes place in a control unit of the refrigerating appliance; and

6 is a flowchart of a second embodiment of the working method.

The refrigerator shown in a schematic cross-section in Fig. 1 is a Nofrost household refrigerator of known type, with a heat-insulating body 1 and a door 2, which delimit an interior, through an intermediate wall 3 in a storage chamber 4 for refrigerated goods and an evaporator chamber 5 is divided. A refrigerant circuit comprises, in a manner known per se, an evaporator 6 arranged in the evaporator chamber 5, a compressor 7 accommodated in a rear recess of the body 1, and a condenser 8. A fan 9 accommodated in the evaporator chamber 5 drives the exchange of air between the evaporator chamber 5 Evaporator 5 and the storage chamber 4 via openings of the intermediate wall 3 at. Compressor 7 and fan 9 are each adjustable to a plurality of different non-zero speed values. The refrigerator may be equipped with an automatic ice maker 23 and / or a cold water dispenser 24, which are connected in a conventional manner to an external water line, not shown here, to flow through this fresh water when cooled is tapped on the dispenser 24 or an ice stock in ice maker 23 is running low.

An electronic control unit 10 switches the compressor 7 and the fan 9 on and off in accordance with settings of the storage chamber 4 and the environment of the refrigerator measured by temperature sensors 11, 12 taking into account settings made by a user at a user interface 13 State their speeds firmly.

The user interface 13 can have various types of operating and display elements; purely by way of example, the case is considered here, as shown in FIG. 2, of a matrix display 14, for example of the LCD type, on which alphanumeric characters and various symbols can be displayed, and the display 14 has adjacent keys 15 to 18, the function of which is variable and is illustrated in each case by a symbol 19 to 22 shown adjacent to the relevant key on the display 14. In a normal or first mode of operation of the display 14 in which, for example, as shown in FIG. 2, it indicates in a central area the temperature measured by the sensor 11 in the storage chamber 4, it is adjacent to one of the keys, here the key 16 shown in a second or reduced-noise operating mode indicative symbol 20. When the user presses the key 16, the control unit 10 changes to the noise reduced operating mode and the icon 20 disappears. With the change to the second operating mode, a timer of the control unit 10 is set in motion. At the same time, a symbol 22 becomes visible, which is intended to arouse the user's association with injustice. It is shown in FIG. 2 adjacent to the key 18 to make it clear to the user that he can reestablish the more economical first mode of operation via this key 18, but it could also appear in place of the key 20 adjacent to the key 16; in this case, the user could switch between first and second modes by repeatedly pressing the button 16. If the refrigeration device comprises the ice maker 23 and / or the cold water dispenser 24 as mentioned above, then keys 25, 26 for their operation are also provided on the user interface 13 as shown in FIG. The symbols 27, 28 associated with the keys 25, 26 are displayed on the display 14 only in the first operating mode; In the second mode of operation, the device does not respond to an actuation of the keys 25, 26, and to illustrate the non-usability of the keys to the user, the symbols 27, 28 have disappeared. By blocking the ice making and / or the output of cooled water in the second operating mode, no fresh water flows from the outside into the refrigerating appliance during this time. The risk of heating the storage chamber, the removal of which could take a long time in the second mode of operation, is thus avoided.

A switch 29 mounted on a side wall of the body 1 is operable by opening and closing the door 2 and connected to the control unit 10. When the door 2 is opened, in any case, warm ambient air penetrates into the storage chamber 4; possibly also fresh, warm refrigerated goods have been invited. In both cases, there is the possibility that the heat that has penetrated in the second operating mode can not be eliminated quickly enough, for which reason the control unit 10 switches from the second to the first operating mode upon detection of a door operation. It can also be provided that a first-time door opening or a given number of door openings in the second operating mode still cause no reaction and the control unit 10 returns to the first operating mode only on the second opening or if the given number of door openings is exceeded. The timer, after a predetermined period of operation in the second mode, returns control unit 10 to the first mode of operation, unless previously done for other reasons. Since such a non-stop operation in the second mode of operation is excluded, the cooling capacity in the second mode of operation may be lower than required for safe continuous operation; If, in the second operating mode, heating of the storage chamber 4 occurs, sufficient cooling power is then available in the first operating mode in order to remove it again.

In order to ensure that any heating after the end of the second operating mode is actually eliminated, it may be provided that, if the time is Restored to the first operating mode, the icon 20 is displayed only after expiration of a lock time and the control unit 10, as long as this lock time lasts, does not respond to an actuation of the button 16, but maintains the first mode of operation. In this case, an actuation of the key during the blocking period can be completely ignored, or it can be taken into account by the control unit 10 delayed, by returning to the second operating mode after the expiration of the blocking period.

According to a further development, it can be provided that when the control unit returns to the second operating mode after the expiration of the blocking period, the rotational speed of the compressor 7 first assumes a high value and after a predetermined time of e.g. 3h is limited to a lower value. As soon as a relatively high cooling capacity is available as soon as the second operating mode is switched on, the blocking time can be selected short.

The fan 9 can be operated as the compressor 7 in the second operating mode with different staggered depending on the ambient temperature T12 speeds; but it can also be set for simplicity, only one fixed speed of the fan 9 at the beginning of the second operating mode based on the ambient temperature T12, which is not exceeded, as long as the second mode of operation persists.

The fact that at the beginning of the second operating mode, a speed of the compressor 7 and possibly also of the fan 9 is set and this is not exceeded, as long as the second mode stops, may cause the bearing chamber 4 is gradually heated above the allowable level. To preclude damage to the item to be cooled, it is provided according to a development that the control unit 10 terminates the second operating mode and returns to the first when the temperature T11 in the storage chamber 4 exceeds a limit value. This limit can be, for example - 12 ° C, when the storage chamber 4 is a freezer. By means of the key 17, a programming mode of the control unit 10 can be called up, both from the first and the second operating mode, in which various menus for setting parameters on the display 14 are presented to the user. One of the menus selectable by repeatedly pressing the key 17 is shown in FIG. The central area 23 of the display 14 indicates here two times, one above Line 24 numbers 1 to 7, which correspond to the seven days of the week. By repeatedly pressing the keys 16 or 18 indicated by adjacent symbols as forward / backward keys, the individual days of the week or even all days of the week can be selected in sequence. The selected weekday, in this case the Wednesday corresponding to the number 3, is recognizable in each case by a representation of its number deviating in color or brightness.

If the user has confirmed the selection of the highlighted day of the week by pressing the key 15, the start time of the time interval displayed in the central area 23 is also adjustable - likewise with the aid of the keys 16, 18. After setting the desired start time, the user again actuates the key 15 to subsequently program the end of the time interval. It can be provided that the control unit 10 performs a background check during the programming by the user and does not allow setting too long a time interval of, for example, more than eight hours.

After programming the time interval, the user can select the next day of the week for programming by means of the button 15 or confirm the programming made via the button 17 and change to another menu or leave the programming mode again.

The control unit 10 has storage space for storing at least one set of start and end times corresponding to the days of the week; but it can also be provided that a plurality of such sets are programmable and storable, so that the user can save, for example, for holidays other times than for working days and can select the appropriate to his current needs set of times as needed.

FIG. 5 shows a flow chart of a working program running in the control unit 10. In step S1, the control unit 10 waits until the temperature measured by the sensor 11 in the storage chamber 4 rises above a switch-on threshold T _e i _n . In step S2, the control unit 10 checks whether the noise-reduced operating mode is selected or not, either because the user has activated the noise-reduced operating mode via the key 16 of the interface 13 or because the current time in a as above described programmed time interval for the noise reduced operating mode falls. If this is not the case, the control unit 10 detects the ambient temperature T12 measured by the temperature sensor 12 in step S3 and sets the compressor 7 and the fan 9 with a respectively measured ambient temperature T12 from a table read compressor speed nV1 (12 ) or nL1 (T12) in progress.

In step S4, it is checked whether the detected from the sensor 1 1 T11 temperature of the storage chamber 4 has reached a predetermined switch-off temperature T _out. If so, the compressor and fan are turned off, and the process returns to step S1 and waits for the temperature of the storage chamber 4 to rise again above the on threshold T on. If the switch-off temperature T _{off is} not reached, the method proceeds to step S5, where it is checked whether a maximum allowable continuous run time of the compressor 7 or an expected shelf temperature T _{exp is} exceeded. This temperature T _exp is smaller than the switch-on limit temperature T _e i _{n by} a value proportional to the switch-on of the compressor 7 in step S3 and corresponds to a cooling rate to be expected at the present ambient temperature T12. As long as the conditions of step S5 are not met, ie, the device is expected to cool, the process returns to step S4. If, on the other hand, one of the conditions is fulfilled, new, higher speeds nV2 (T12), nL2 (T12) for the compressor 7 and the fan 9 are set in step S6. This is followed by S4 and S5 analogous steps of checking for undershooting the switch-off temperature (S7) and checking for exceeding the maximum compressor allowable time or the expected compartment temperature S8. The compressor run time, which is checked for exceeding in step S8, is of course longer than that of step S5, or it is measured only after the execution of step S6. If the step S8 also results in exceeding the second maximum transit time, without the switch-off temperature having previously fallen below, and therefore the method branched from step S7 back to S1, the speeds of the compressor 7 and the fan 9 are reset to nV3 (T12) in step S9 ), nL3 (T12), and the process waits in step S10 until finally the switch-off temperature has fallen below again.

If, on the other hand, it is determined in step S2 that noise-reduced operation is selected, then the control unit 10 selects a predetermined predetermined value in step S1, which ting temperature T12 independent speed values nVsl or nl_s1 and takes compressor 7 and fan 9 with these speed values in operation. These speed values nVsl and nLsl are generally in the lower power range of the compressor 7 and the fan 9, but are not the lowest adjustable speed values, as they will generally not be sufficient at a normal ambient temperature to maintain the storage chamber 4 at the desired temperature , Subsequently, as tested in step S4 whether the storage chamber 4 has again reached the switch-off temperature T _out. If yes, the method returns to step S1, otherwise it is checked in S13 whether the time since the refrigerator is in the noise-reduced operating mode has reached a permissible upper limit. If so, the noise reduced mode is turned off in step S14 before the process returns to step S1. If the permissible operating time has not yet been exceeded in the noise-reduced mode, it is instead checked in step S15 whether an impermissibly high temperature T _max in the storage chamber 4 has been reached. This temperature may be higher by a predetermined difference than the switch-on temperature T _e i _n , but it is also conceivable to give the user the freedom to program this temperature T _max . If this temperature T _{max is} exceeded, the control unit terminates the noise reduced mode in step S14 and returns to step S1 according to a first embodiment of the method. According to a second embodiment, higher ambient temperature independent speeds nVs2, nLs2 of the compressor 7 and the fan 9 are set in a step S16 before the process returns to step S12.

FIG. 6 shows a flow diagram of a second embodiment of the working method running in the control unit 10. The steps S1, S2 and the steps S3 to S10 specific to the first operating mode are the same as in the method of FIG. 5 and will not be explained again. Both methods differ in what happens when it has been determined in step S2 that - whether it was by timing or pressing the button 16 - the noise-reduced operation has been activated. In this case, it is first checked here in step S21 whether the ambient temperature T12 detected by the temperature sensor 12 is below a low first limit value Tlim1. If so, then step S22 sets a low initial speed nVsl for the compressor 7. At the same time a corresponding low initial speed nLsl for the fan 9 can be set. If, on the other hand, it is determined in step S21 that the ambient temperature T12 is above Tlim1, then in step S23 the comparison follows with a second, higher limit value Tlim2. If this is also exceeded, then the environment of the refrigerator is too warm to allow reduced in noise and cooling performance operation, and the process returns via step S26 to normal operation.

If the ambient temperature is below the threshold value Tlim2 in step S23, the initial speeds of the compressor 7 and the fan 9 are set to nVs2 and nl_s2, respectively, in step S24. The compressor speed nVs2 is greater than nVsl; in the case of the fan, the speed nLs2 may also be greater than nLs1, for the sake of simplicity, both may be identical, i. it is set only the initial speed of the compressor 7 based on the ambient temperature T12; that of the fan 9 is independent of the ambient temperature. Of course, more than the two limits Tlim 1, Tlim2 the ambient temperature and these associated initial speeds of the compressor 7 and / or the fan 9 could be defined.

Step S22 and step S24 are respectively followed by the startup of the compressor 7 and the fan 9 at the fixed speeds, and in step S25 a check is made as to whether the maximum permissible duration of the reduced-noise operation has been reached. If so, then the control unit turns off the noise reduced mode again in step S26 and returns to the starting point S1. If the maximum duration is not exceeded, a check is made in step S27 as to whether a maximum permissible temperature Tmax of the bearing chamber 4 has been exceeded. If this is the case, the cooling capacity of the compressor 7 at the speed set in step S22 or S24 obviously does not suffice to compensate for the heat flow from the environment into the storage chamber 4, so that again the noise reduced operation is terminated in step S26 and the Procedure returns to the exit.

Otherwise, it is checked in step S28, as in step S7, whether the switch-off temperature Tout is undershot. If not, the process returns to step S25, if so, then the compressor 7 and the fan 9 are turned off, and in step S29, the process returns to step S25. waited until the storage chamber 4 has warmed up again to the switch-on temperature Tein. Once this is done, the process again returns to step S25.

The invention is described above only in connection with a Nofrost refrigerator; However, the transmission of the invention to other types of refrigerators should be apparent to those skilled in the art from the above. The transfer to a coldwall refrigerator essentially involves only a simplification compared to what has been described, since the fan and its control can be dispensed with. Use on freezer or combination appliances requires no significant adjustments.

Claims

Refrigeration appliance, in particular household refrigerating appliance, with at least one assembly (7, 9) which can be operated at different non-vanishing values (nV1 (T12), nl_2 (T12), ...) of an operating parameter (nV, nL) influencing the noise emission, and a control unit (10), which is set up to autonomously vary the value of the operating parameter (nV, nL) in a first operating mode, characterized in that the control unit (10) can be switched to a second operating mode in which it unites the module (7; 9) with a single operating mode non-zero value (nVsl, nLsl) of the operating parameter.

Refrigeration appliance according to claim 1, characterized in that the control unit (10) is arranged, the non-disappearing value (nVsl, nLsl; nVs2, nLs2) of the operating parameter, with which the assembly (7, 9) is operated in the second operating mode, depending on to select an ambient temperature (T12) detected when entering the second operating mode.

Refrigerating appliance according to claim 1 or 2, characterized in that the assembly (7; 9) is a relevant assembly for the cooling, in particular a compressor (7) or a fan (9).

Refrigerating appliance according to claim 1, 2 or 3, characterized in that the operating parameter is a rotational speed (nV, nL) or a frequency of a drive of the assembly (7, 9).

Refrigerating appliance according to one of the preceding claims, characterized in that the control unit (10) is arranged to select the value of the operating parameter (nV, nL) as a function of the ambient temperature (T12) in the first operating mode (S3).

Refrigerating appliance according to one of the preceding claims, characterized by a user interface, via which the switching of the control unit (10) is controllable.

7. Refrigerating appliance according to one of the preceding claims, characterized in that the control unit (10) has a time switching unit for daytime switching between the operating modes.

8. Refrigerating appliance according to claim 6, characterized in that the control unit (10) has a time switching unit for daytime switching between the operating modes and that the switching times of the time switching unit by a user to the user interface (13) are adjustable.

9. Refrigerating appliance according to one of the preceding claims, characterized in that the control unit (10) is adapted to store a daily or weekly recurring pattern of switching times.

10. Refrigerating appliance according to one of the preceding claims, characterized in that the user interface (13) has a switching element (16, 18) for immediate switching at least from the first to the second operating mode.

1 1. Refrigerating appliance according to claim 10, characterized in that after a return from the second to the first operating mode, a switch back to the second operating mode is temporarily blocked.

12. Refrigerating appliance according to one of the preceding claims, characterized in that the control unit (10) is set up,

at the latest after expiry of a predetermined maximum operating time in the second operating mode and / or

in response to a door operation and / or

in response to exceeding a temperature limit in a storage compartment of the refrigerator

to return to the first operating mode (S13).

13. Refrigerating appliance according to one of the preceding claims, characterized in that the control unit (10) is adapted to switch to a corresponding to a higher cooling capacity value of the operating parameter when the Temperature (T1 1) in at least one storage area (4) of the refrigeration device exceeds a maximum permissible value (T _max ) (S15, S14, S15, S16).

14. Refrigerating appliance according to claim 13, characterized in that the maximum permissible value (T _max ) is adjustable by the user.

15. Refrigerating appliance according to one of the preceding claims, characterized by at least one module, in particular an ice maker (23) and / or a cold water dispenser (24), whose operation is enabled in the first operating mode and locked in the second operating mode.