EP0154119B1 - Appareil de commande de dégivrage pour une installation de réfrigération - Google Patents

Appareil de commande de dégivrage pour une installation de réfrigération Download PDF

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Publication number
EP0154119B1
EP0154119B1 EP85100315A EP85100315A EP0154119B1 EP 0154119 B1 EP0154119 B1 EP 0154119B1 EP 85100315 A EP85100315 A EP 85100315A EP 85100315 A EP85100315 A EP 85100315A EP 0154119 B1 EP0154119 B1 EP 0154119B1
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EP
European Patent Office
Prior art keywords
circuit
alarm
bistable flip
switching
switched
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85100315A
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German (de)
English (en)
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EP0154119A1 (fr
Inventor
Klaus Engel
Roland Schmidt
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Danner Schutzgastechnik und Apparatebau & Co GmbH
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Danner Schutzgastechnik und Apparatebau & Co GmbH
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Application filed by Danner Schutzgastechnik und Apparatebau & Co GmbH filed Critical Danner Schutzgastechnik und Apparatebau & Co GmbH
Priority to AT85100315T priority Critical patent/ATE34217T1/de
Publication of EP0154119A1 publication Critical patent/EP0154119A1/fr
Application granted granted Critical
Publication of EP0154119B1 publication Critical patent/EP0154119B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits

Definitions

  • the invention relates to a defrost control unit for a refrigeration system according to the preamble of claim 1.
  • Larger cooling systems generally consist of a larger goods room in which the goods to be cooled are stored and a separate evaporator room of a cooling unit.
  • the thermal connection between the evaporator room and the goods room is established via a switchable additional fan (fan).
  • time switches which switch off the chiller and the fan at adjustable time intervals and at the same time switch on the additional heating.
  • the chiller is switched on again and the additional heating is switched off by the time switch after a period of time that is set so that the defrosting process is likely to be completed. Since the defrosting time depends on a number of boundary conditions, the setting of a fixed and estimated time period for the defrosting process is unsatisfactory. If the chiller is switched back on too early, the defrosting process has not yet ended and the full cooling capacity of the system will not be achieved. If the chiller is switched on too late, the defrosting process is safely completed, but the additional heating runs too long and the system parts become undesirably too warm. At the same time, there is a risk that the fan will blow warm air onto the refrigerated goods.
  • the fan is also switched on with a time delay from the time switch, this time period being selected longer than the previous one, so that when the fan is switched on, the evaporator in particular has probably already reached its cooling temperature.
  • the optimal time for switching on the fan depends on a number of conditions that cannot be satisfactorily taken into account in the fixed and estimated delay time.
  • a known defrost control unit (GB-A-1 553 666) the defrost cycles are carried out in a time-controlled manner.
  • the activation and deactivation of the heating and ventilation for the defrosting process is temperature-controlled.
  • a temperature sensor is preferably attached to the evaporator, which is connected to two switching units for an upper and a lower temperature switching point.
  • the upper temperature switching point is set at around 0 ° C so that when this switching point is reached the end of the defrosting process is recognized and the chiller is switched on again while the auxiliary heating is switched off.
  • the lower temperature switching point is used to switch the fan on again after the defrosting process and can be set according to the desired cooling temperature. This ensures that the fan neither conveys air that is too cold nor too warm to the cold room.
  • a well-known component is the temperature sensor, which can either break or fall off the evaporator.
  • the temperature sensor cable can also break or be separated from the device housing.
  • the known circuit is erroneously signaled that the evaporator temperature is too high, so that the refrigerator remains switched on despite the defrosting pulses, ie the defrosting process is not initiated.
  • the fan is switched off and is not switched on again due to the pretended high temperature.
  • both the refrigerated goods and the refrigeration machine itself are endangered, since in particular these conditions cannot be recognized from outside the cold room.
  • an additional safety thermostat is known which signals an alarm if the temperature in the cold room rises excessively.
  • the object of the invention is to provide a defrost control unit with which the safety of the refrigerated goods during the operation of a refrigeration system is increased.
  • This object is achieved with the features of claim 1.
  • claim 1 is at an alarm and safety circuit is provided in a generic defrost control unit, in which a time clock is included, which generates at least one, preferably eight time clock pulses within a defrost period (after the defrosting process or after the fan has been switched on).
  • a time clock is included, which generates at least one, preferably eight time clock pulses within a defrost period (after the defrosting process or after the fan has been switched on).
  • this is achieved in such a way that the monitoring pulse is fed to one input of a NAND circuit, while the transmitter for the lower temperature switching point and the output of a first bistable multivibrator for the defrosting process and the output of a second one are connected in parallel to the other input of the NAND circuit bistable toggle switch for the fan are switched.
  • An alarm system that is mounted on the front of the device housing is connected to the output of the NAND circuit for on-site alarm detection. Furthermore, it is particularly advantageous to additionally connect a further alarm switching unit for remote alarms.
  • This alarm switching unit expediently consists of a relay which is energized in normal operation and drops out when an alarm is given and closes a potential-free contact which can be connected from the outside.
  • the NAND circuit is further followed by a third bistable flip-flop for the alarm condition, which maintains an alarm state once generated on the alarm devices, regardless of the further operating states on the alarm devices. This is advantageous because it also detects alarm conditions that will resolve themselves over time.
  • the control unit is briefly switched off to acknowledge the alarm.
  • the output of the third flip-flop is connected to priority inputs of the first and second flip-flops. This advantageously ensures that when any alarm is given, both the refrigerator and the fan continue to run; H.
  • the defrosting control device releases itself from responsibility due to a fault and tries to maintain the condition that is in any case safe for the refrigerated goods, namely constant cooling. Whether this actually succeeds depends on the type of error. If the fault is due to the defrost control unit itself, for example in the event of a sensor break, the state of constant cooling can usually be maintained.
  • the first and second bistable multivibrators are connected in series, the output of the first bistable multivibrator being connected to a priority input of the second bistable multivibrator.
  • a major advantage of series connection is that the alarm circuit queries whether a successive control sequence has taken place after a certain period of time.
  • Claim 3 proposes a reset circuit which consists of a chargeable capacitor with a downstream inverter. During the charging time of the capacitor, this reset circuit outputs the switching state «I» and after the charging time the switching state «0».
  • the reset circuit is connected to all reset inputs of the bistable flip-flops used, so that all of these switching elements are reset during the charging time of the capacitor. This is a simple and functional circuit.
  • the relays for controlling the chillers or the additional heating and the fan should be switched so that they are not energized when the cooling machine and the fan are switched on. This advantageously means that in the event of a power failure on the control lines, e.g. if a fuse blows or there is a power failure in the defrost control unit, the "constant cooling" state is maintained.
  • Claim 8 specifies an expedient embodiment of the time clock.
  • the single figure shows schematically the circuit diagram for a defrost control device according to the invention.
  • the circuit of the defrost control unit consists of a power supply unit 1, a temperature measuring amplifier 2 and a driver circuit 3 for various light emitting diodes and relays, these circuit parts being linked by bistable flip-flops to be described in more detail.
  • the power supply unit 1 is equipped in the usual way with a mains transformer 4, a rectifier 5 behind it, downstream smoothing capacitors 6 and Zener diodes 80. Direct voltage of different polarity is available at the outputs V + and V-.
  • the line frequency is fed via line 7 immediately after the line transformer 4 to an input 8, a counter circuit 9 described in more detail below.
  • connection points of a temperature sensor 10 are specified in the temperature measuring amplifier 2.
  • the temperature sensor 10 is arranged on the evaporator of the refrigerator via an extended line.
  • the first connected amplifier 11 serves as a constant current source for the temperature sensor 10.
  • the subsequent amplifier 12 amplifies the sensor signal by a factor of approximately 10.
  • the output signal of the amplifier 12 is fed to the inputs of two Schmitt triggers 13, 14.
  • the switching points of the Schmitt triggers 13, 14 can be set accordingly via adjustable resistors 15, 16. These resistors are potentiometers that can be set on the front panel of the device housing.
  • the circuitry on the Schmitt trigger 14 is dimensioned so that hum is suppressed.
  • the connection of the Schmitt trigger 13 (fan activation) is selected so that a relatively large switching hysteresis, the meaning of which is explained below, arises.
  • the driver circuit 3 is designed in a manner known per se.
  • An alarm light-emitting diode 17 and a cooling light-emitting diode 18 light up when “i” potential (high potential) is present on their control lines 19, 20.
  • An alarm relay 21 keeps a switch contact 22 closed in the deenergized state and opens it when the line 23 is “1”.
  • the contact 22 can be wired from the outside with a remote alarm transmission.
  • a defrost relay 24 contains a changeover contact 25 with which the circuit for the cooling unit is closed in the de-energized state of the defrost relay 24 and the circuit for an additional heater is closed in the excited state. In the excited state of the defrost relay 24, a defrost LED 26 (yellow) is also lit.
  • a fan relay 27 closes the circuit (not shown) of a fan when not energized; when excited, the circuit is opened and the fan is switched off.
  • the relays 24 and 27 two transistors are connected in series in order to obtain redundancy and to increase the switching reliability of these relays in the event of an, albeit unlikely, failure of a switching transistor.
  • the counter circuit 9 consists of two electronic counters (CD 4040) 28, 29 connected in series. At the counter 28, frequencies formed and divided down from the mains frequency are available at different outputs 30. These different frequencies can be tapped via a switch 31 and fed to the downstream counter 29. The switch position of switch 31 (attached to the front panel of the housing) determines the duration of the successive defrost cycles. A defrost pulse is generated in line 32 at the output of counter 29 to initiate the defrosting process after a certain number of pulses counted in counter 29.
  • Line 32 leads to a defrost flip-flop (CD 4013) 33, the output line 34 of which leads to the driver circuit for defrost relay 24.
  • the reset input 35 of the defrost flip-flop 33 is connected to the output of the Schmitt trigger 14 via a line 36 and diode 37.
  • Line 34 also leads via a diode 38 to an input 39 of a NAND element 40.
  • the output signal of the defrost flip-flop 33 goes from line 34 via a branch and diode 41 to a set input 42 of a fan flip-flop 43.
  • Another line 44 with the same signal is connected to a further input 79 of the fan flip-flop.
  • An output line 45 of the fan flip-flop 43 leads to the driver circuit for the fan relay 27 and at the same time via a branching line 46 to an input 47 of a NAND element 48 connected to the cooling light-emitting diode 18; the other input 49 is connected to the line 34 via a diode 50 and to a flashing frequency output of the counter 28 via a diode 51.
  • a further line 52 branches off from the output line 45 and also has a connection to the input 39 of the NAND element 40 via a diode 53.
  • a line 54 leads via a diode 55 to the reset input 56 of the fan flip-flop 43.
  • the Schmitt trigger 13 also has a connection to the input 39 of the NAND gate via a branching line 57 and diode 58 40.
  • the second input 59 of the NAND gate 40 is connected to an output 61 of the counter 29 via an RC circuit (one shot). At this output 61 eight pulses per cycle are generated in a pulse train.
  • an alarm flip-flop 64 is formed, to the set input of which a line 65 from the NAND element 40 is connected.
  • the outputs of the alarm flip-flop 64 are connected to the lines 19, 23.
  • the output of the alarm flip-flop 64 is branched off from the line 19 once via the diode 66 to the reset input 35 of the defrost flip-flop 33 and additionally via the line 67 to a priority input 68 of the fan flip-flop 43 connected.
  • a reset circuit (reset) consists essentially of a chargeable capacitor 69, which is followed by an inverting element 70.
  • the connected line 71 is with reset inputs 72, 73 of the counters 28, 29 via an inverting element 74 with the reset input on the alarm flip-flop 64, via a diode 75 with the reset input 35 of the defrost flip-flop and via a diode 76 connected to the set input 42 of the fan flip-flop 43.
  • a line 78 leads from the counter 28 via a diode 77 to a branching point with the line 54. This square-wave frequency serves to avoid unsafe switching states due to the edge control on the fan flip-flop 43.
  • the circuit described has the following function: When the defrost control unit is switched on, the capacitor 69 is charged. During this charging time, because of the inversion by the link 70, “I” is on the line 71. As a result, the counters 28 and 29 are reset to zero via the reset inputs 72, 73. Furthermore, the alarm flip-flop 64 is set to its initial state (no alarm). At the same time, the defrost flip-flop 33 is reset, with the result that the output line 34 becomes “0”; d. H. Defrost relay 24 has safely dropped off and thus the refrigerator is switched on. Via the line 71 and the diode 76, however, the fan flip-flop 43 is also set at the set input 42. As a result, line 45 becomes "I", fan relay 27 picks up and switches the fan off. This is the starting state for the circuit. As soon as the capacitor 69 is charged, the line 71 becomes “0” again, which ends the reset at the start of operation.
  • the circuit works as follows: After cooling is switched on immediately with relay 24, the temperature on the cooling unit decreases. The Schmitt trigger 13 then switches at the set lower switching point, as a result of which the fan flip-flop is reset via the reset input 56. Line 45 becomes “0”, relay 27 drops out and the fan is switched on.
  • the defrosting process is carried out until sensor 10 detects a suitably set temperature above 0 ° C on the evaporator. Then the Schmitt trigger 14 switches and the defrost relay 33 is reset via the reset input 35. As a result, line 34 becomes “0”, relay 24 drops out, the additional heating is switched off and the refrigerator is switched on again. After reaching the lower temperature switching point, the Schmitt trigger 13 switches in the manner described above and the fan is switched on again. As long as the defrost relay 24 is energized, the yellow defrost light-emitting diode 26 lights up (signaling for: additional heating ON, fan OFF).
  • the cooling light-emitting diode 18 is only switched off (line 20 “O”) when “I” is present at both inputs 49, 47 of the NAND element 48. This is the case when both lines 34, 45 from the outputs of flip-flops 33 and 43 are "I", i. H. during defrosting with the fan off. If the chiller is already switched on again (line 34 or diode 50 "0"), the cooling light-emitting diode would burn again. In order to identify this state by blinking, however, a blinking frequency is passed from the counter 28 to the input 49 via the line with the diode 51. Each time the input 49 becomes "I", the LED 18 goes out. If the fan is then switched on and there is a permanent “0” at input 47 via line 45 or 46, LED 18 lights up continuously regardless of the blinking frequency at input 49.
  • the monitoring and alarm conditions are described in the following: Every time a monitoring pulse arrives at the input 59 of the NAND gate 40 after one eighth of the time of a defrost cycle, a check is carried out to determine whether “I” is present at the other input 39 (alarm condition). In this case, the alarm flip-flop 64 is set and an alarm is given via the light-emitting diode 17 and the relay 21. It is checked via line 54, 57 and diode 58 whether the lower temperature switching point is still undershot and whether the refrigerator is functioning properly. Furthermore, it is checked via line 34 and diode 38 whether the cooling unit and not the auxiliary heating is faulty switched on. In the same way, it is checked via line 52 and diode 53 whether fan 27 is switched on.
  • the evaporator Due to the above-described monitoring pulse sequence after every eighth period, the evaporator usually detects a misplacement or a drop in the sensor. Since the sensors are usually relatively slow and have a large heat capacity, they only work sufficiently quickly if good thermal contact with the evaporator has been created. If this is no longer the case, for example due to the sensor drop, i.e. the sensor is hanging in the air, the lower temperature switching point is normally not reached by the sensor in the sensor housing within the eighth period. As a result, the defrost control unit is simulated for a cooling temperature that has not been reached (fan activation point), which leads to the alarm being triggered.
  • the 12.5 Hz alternating voltage from the counter 28 on the line 78 is used for the safe resetting of the edge-controlled fan flip-flop 43. This is because special cases can occur in which the output of the Schmitt trigger 13 goes to zero, but practically comes late, so that another level may have applied to a priority input of the flip-flop 43. Then the zero level from the Schmitt trigger 13 would have no effect.
  • the cold room for example, could be so cold immediately after the device was switched on that the edge from the Schmitt trigger no longer comes from “I” to “0” but is already at an “O” level. In theory, therefore, no edge would be generated anymore and the flip-flop 43 would not take over the data at the input 79 without the AC voltage.
  • the larger hysteresis on the Schmitt trigger 13 for the lower temperature switching point already mentioned above is provided for the following case. If the fan is switched on in order to establish the thermal connection between the evaporator chamber and the cooling chamber, the evaporator chamber can be thermally stressed, so that the temperature rises there briefly. If the connection were made just when the verification pulse was already coming, this would lead to an alarm. With the help of the hysteresis provided, the device is allowed to briefly go over this point without triggering an alarm.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Claims (8)

1. Appareil de commande de dégivrage pour une installation de réfrigération, comprenant une sonde de température destinée à être montée sur l'évaporateur d'une machine frigorifique, un circu-. it d'entrée, auquel la sonde de température est reliée et qui comporte une première (13) et une seconde (14) unité de commutation pour un point inférieur et un point supérieur de température, et un générateur de rythme (28) pour des cycles de dégivrage successifs, générateur qui est connecté à un premier circuit de sortie (24) pour la mise en circuit et hors circuit de la machine frigorifique et pour la mise hors circuit et en circuit simultanée d'un chauffage auxiliaire, ainsi qu'à un second circuit de sortie (27) pour la mise en circuit et hors circuit d'un ventilateur auxiliaire, les connexions passant par les entrées de positionnement d'une première (33) et d'une seconde (43) bascule bistable, de telle sorte que quand une impulsion de rythme est produite, par positionnement des bascules bistables, la machine frigorifique soit mise hors circuit et, en même temps, le chauffage auxiliaire soit mis en circuit avec le premier circuit de sortie (24) et le ventilateur auxiliaire soit mis hors circuit avec le second circuit de sortie (27), la seconde unité de commutation (14) pour le point supérieur de température étant connectée à l'entré de remise en l'état initial de la première bascule bistable (33), de telle sorte que quand ce point de température est atteint, la machine frigorifique soit remise en circuit et le chauffage auxiliaire soit remis hors circuit, et la première unité de commutation (13) pour le point inférieur de température étant connectée à l'entrée de remise à l'état initial de la seconde bascule bistable (43), de telle sorte que quand ce point de température est atteint, le ventilateur auxiliaire soit remis en circuit, caractérisé en ce qu'il est prévu, pour la surveillance de l'installation de réfrigération, un circuit d'alarme et de sécurité comportant un autre générateur de rythme (29) qui produit au moins une impulsion de rythme dans les limites d'une période de dégivrage et qui est connecté à l'une des entrées (59) d'un circuit NON-ET (40), en ce qu'à l'autre entrée (39) du circuit NON-ET (40) sont connectées la sortie (54) de la première unité de commutation (13) pour le point inférieur de température, la sortie (34) de la première bascule bistable (33) et la sortie (52) de la seconde bascule bistable (43), en ce qu'à la sortie du circuit NON-ET (40) sont connectées une lampe d'alarme (17) et/ou une unité de commutation d'alarme (21), en ce qu'entre le circuit NON-ET (40) et la lampe d'alarme (17) ainsi que l'unité de commutation d'alarme (21) est montée une troisième bascule bistable (64) pour le maintien d'un état d'alarme une fois qu'il a été produit, et en ce que la sortie de la troisième bascule bistable (64) est reliée à des entrées affectées de priorité (35, 68) de la première et la seconde bascule bistable (33, 43), de telle sorte qu'après que l'alarme a été donnée, la machine frigorifique et le ventilateur auxiliaire soient mis en circuit de façon permanente jusqu'à l'accusé de réception de l'alarme.
2. Appareil de commande de dégivrage selon la revendication 1, caractérisé en ce que la première bascule bistable (33) et la seconde bascule bistable (43) sont montées en série, la sortie de la première bascule bistable (33) étant connectée à une entrée affectée de priorité de la seconde bascule bistable (43).
3. Appareil de commande de dégivrage selon la revendication 1 ou 2, caractérisé en ce qu'à l'entrée de remise à l'état initial de la troisième bascule bistable (64), ainsi qu'aux entrées de remise à l'état initial (72,73) des générateurs de rythme (28, 29), à l'entrée de remise à l'état initial de la première bascule bistable (33) et à l'entrée de positionnement de la seconde bascule bistable (43) est connecté un circuit de remise à l'état initial qui se compose d'un condensateur rechargeable (69) suivi d'un circuit inverseur (70), de telle manière que pendant le temps de recharge du condensateur (69), l'état de commutation «I» soit produit par le circuit de remise à l'état «O» soit produit, ce qui fait que pendant le-temps de recharge, tous les éléments de circuit susceptibles d'être remis à l'état initial sont mis dans un état initial.
4. Appareil de commande de dégivrage selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'unité de commutation d'alarme est un relais (21) qui est sans courant en cas d'alarme et qui ferme alors contact (22) exempt de de potentiel, commutable de l'extérieur.
5. Appareil de commande de dégivrage selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'unité de commutation (13) pour la valeur limite de température inférieur présente une hystérésis de commutation, de telle manière qu'en cas de charge thermique dans le compartiment de l'évaporateur lors de la mise en circuit du ventilateur auxiliaire, il ne soit pas donné d'alarme inopportune.
6. Appareil de commande de dégivrage selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le premier circuit de sortie (24) est un relais inverseur qui est excité, lors du processus de dégivrage, en vue de la mise hors circuit de la machine frigorifique et de la mise en circuit simultanée du chauffage auxiliaire, et en ce que le second circuit de sortie (27) est un relais qui est également excité en vue de la mise hors circuit du ventilateur auxiliaire.
7. Appareil de commande de dégivrage selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il est prévu une lampe témoin de refroidissement (18) qui est activée par l'intermédiaire d'un circuit NON-ET (48) dont la première entrée (47) est connectée à la sortie de la seconde bascule bistable (43) et dont la seconde entrée (49) est connectée à la sortie de la première bascule bistable (33) et, en plus, au premier générateur de rythme (28) pour une fréquence de scintillement.
8. Appareil de commande de dégivrage selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le second générateur de rythme (29) est accouplé au premier générateur de rythme (28), des fréquences différentes pouvant être prélevées sur le premier générateur de rythme (28) pour des cycles de dégivrage différents et pouvant être appliquées au second générateur de rythme (29), et le second générateur de rythme (29) délivrant, dans les limites de chaque cycle de dégivrage réglé, un nombre fixe, en particulier de huit impulsions de surveillance.
EP85100315A 1984-02-29 1985-01-14 Appareil de commande de dégivrage pour une installation de réfrigération Expired EP0154119B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100315T ATE34217T1 (de) 1984-02-29 1985-01-14 Abtausteuergeraet fuer eine kaelteanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3407286 1984-02-29
DE19843407286 DE3407286A1 (de) 1984-02-29 1984-02-29 Abtausteuergeraet fuer eine kaelteanlage

Publications (2)

Publication Number Publication Date
EP0154119A1 EP0154119A1 (fr) 1985-09-11
EP0154119B1 true EP0154119B1 (fr) 1988-05-11

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EP85100315A Expired EP0154119B1 (fr) 1984-02-29 1985-01-14 Appareil de commande de dégivrage pour une installation de réfrigération

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EP (1) EP0154119B1 (fr)
AT (1) ATE34217T1 (fr)
DE (2) DE3407286A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646529A (en) * 1986-01-24 1987-03-03 Thermo King Corporation Transport refrigeration unit defrost control system
FR2620525B1 (fr) * 1987-09-15 1990-03-02 Pont P Coffret de regulation pour surgelateur-conservateur
DE4105880A1 (de) * 1991-02-25 1992-08-27 Kueba Kaeltetechnik Gmbh Verfahren und vorrichtung zur leistungsoptimierung und abtausteuerung von kaeltemittelverdampfern
US5479785A (en) * 1994-02-08 1996-01-02 Paragon Electric Company, Inc. Electronic defrost controller with fan delay and drip time modes
ES2101628B1 (es) * 1994-03-30 1998-01-16 Fagor S Coop Ltda Sistema de control de la temperatura en un frigorifico.
US6014325A (en) * 1996-04-15 2000-01-11 Paragon Electric Company, Inc. Controlled DC power supply for a refrigeration appliance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1475131A (en) * 1973-06-20 1977-06-01 Hitachi Ltd Refrigerator control apparatus
US4152902A (en) * 1976-01-26 1979-05-08 Lush Lawrence E Control for refrigeration compressors
GB1553666A (en) * 1976-09-20 1979-09-26 Smiths Industries Ltd Sequence-control apparatus
GB2031631A (en) * 1978-10-16 1980-04-23 Shew A Refrigerator temperature monitor

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Publication number Publication date
DE3407286A1 (de) 1985-09-05
ATE34217T1 (de) 1988-05-15
EP0154119A1 (fr) 1985-09-11
DE3562667D1 (en) 1988-06-16
DE3407286C2 (fr) 1987-03-12

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