ATE34217T1 - DEFROST CONTROL UNIT FOR A REFRIGERATION SYSTEM. - Google Patents

DEFROST CONTROL UNIT FOR A REFRIGERATION SYSTEM.

Info

Publication number
ATE34217T1
ATE34217T1 AT85100315T AT85100315T ATE34217T1 AT E34217 T1 ATE34217 T1 AT E34217T1 AT 85100315 T AT85100315 T AT 85100315T AT 85100315 T AT85100315 T AT 85100315T AT E34217 T1 ATE34217 T1 AT E34217T1
Authority
AT
Austria
Prior art keywords
circuit
bistable flip
alarm
switched
output
Prior art date
Application number
AT85100315T
Other languages
German (de)
Inventor
Klaus Engel
Roland Schmidt
Original Assignee
Danner Schutzgastech & App
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Danner Schutzgastech & App filed Critical Danner Schutzgastech & App
Application granted granted Critical
Publication of ATE34217T1 publication Critical patent/ATE34217T1/en

Links

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

Landscapes

  • 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)

Abstract

1. Defrosting control device for a refrigeration system comprising a temperature sensor to be attached to the evaporator of a refrigerating machine, comprising an input circuit to which the temperature sensor is connected and which contains a first (13) and second (14) switching unit for a lower and an upper temperature switching point, comprising a timing generator (28) for successive defrosting cycles which is connected to a first output circuit (24) for switching the refrigerating machine on and off and simultaneously swithing an additional heater on and off, and to a second output circuit (27) for switching an additional fan on and off, the connections being conducted via the set inputs of a first (33) and second (43) bistable flip-flop circuit so that, when a timing pulse is generated, the refrigerating machine is switched off and simultaneously the additional heater is switched on by means of the first output circuit (24) by setting the bistable flip-flop circuits, and the additional fan is switched off by means of the second output circuit (27), the second switching unit (14) for the upper temperature switching point is connected to the reset input of the first bistable flip-flop circuit (33) so that the refrigerating machine is switched on again and the additional heater is switched off when this temperature switching point is reached, and the first switching unit (13) for the lower temperature switching point is connected to the reset input of the second bistable flip-flop circuit (43) so that the additional fan is switched on again when this temperature switching point is reached, characterized in that an alarm and safety circuit having a further timing generator (29) for monitoring the refrigeration system is provided which generates at least one timing pulse within one defrosting period and which is connected to one input (59) of a NAND circuit (40), that the output (54) of the first switching unit (13) for the lower temperature switching point and the output (34) of the first bistable flip-flop circuit (33) and the output (52) of the second bistable flip-flop stage (43) are connected to the other input (39) of the NAND circuit (40), that an alarm lamp (17) and/or an alarm switching unit (21) are connected to the output of the NAND circuit (40), that a third bistable flip-flop circuit (64) to maintain an alarm state, once generated, is connected between the NAND circuit (40) and the alarm lamp (17) and the alarm switching unit (21), and that the ouput of the third bistable flip-flop circuit (64) is conducted to priority-affected inputs (35, 68) of the first and second bistable flip-flop circuit (33, 43) so that, after an alarm has been signalled, the refrigerating machine and the additional fan are continuously switched on until the alarm has been acknowledged.
AT85100315T 1984-02-29 1985-01-14 DEFROST CONTROL UNIT FOR A REFRIGERATION SYSTEM. ATE34217T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843407286 DE3407286A1 (en) 1984-02-29 1984-02-29 DEFROST CONTROL UNIT FOR A REFRIGERATION SYSTEM
EP85100315A EP0154119B1 (en) 1984-02-29 1985-01-14 Defrost control device for a refrigeration system

Publications (1)

Publication Number Publication Date
ATE34217T1 true ATE34217T1 (en) 1988-05-15

Family

ID=6229099

Family Applications (1)

Application Number Title Priority Date Filing Date
AT85100315T ATE34217T1 (en) 1984-02-29 1985-01-14 DEFROST CONTROL UNIT FOR A REFRIGERATION SYSTEM.

Country Status (3)

Country Link
EP (1) EP0154119B1 (en)
AT (1) ATE34217T1 (en)
DE (2) DE3407286A1 (en)

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 (en) * 1987-09-15 1990-03-02 Pont P REGULATION BOX FOR FREEZER-PRESERVATIVE
DE4105880A1 (en) * 1991-02-25 1992-08-27 Kueba Kaeltetechnik Gmbh METHOD AND DEVICE FOR OPTIMIZING THE PERFORMANCE AND DEFROSTING OF REFRIGERANT EVAPORATORS
US5479785A (en) * 1994-02-08 1996-01-02 Paragon Electric Company, Inc. Electronic defrost controller with fan delay and drip time modes
ES2101628B1 (en) * 1994-03-30 1998-01-16 Fagor S Coop Ltda TEMPERATURE CONTROL SYSTEM IN A REFRIGERATOR.
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

Also Published As

Publication number Publication date
EP0154119B1 (en) 1988-05-11
DE3407286C2 (en) 1987-03-12
EP0154119A1 (en) 1985-09-11
DE3407286A1 (en) 1985-09-05
DE3562667D1 (en) 1988-06-16

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Legal Events

Date Code Title Description
REN Ceased due to non-payment of the annual fee