(19)
(11) EP 0 250 909 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.04.1989 Bulletin 1989/17

(43) Date of publication A2:
07.01.1988 Bulletin 1988/01

(21) Application number: 87108043.8

(22) Date of filing: 03.06.1987
(51) International Patent Classification (IPC)4: F25D 21/08, G05D 23/275, F25D 21/00
(84) Designated Contracting States:
CH DE ES FR GB IT LI

(30) Priority: 03.07.1986 IT 4573486

(71) Applicant: INDUSTRIE ZANUSSI S.p.A.
I-33170 Pordenone (IT)

(72) Inventors:
  • Marega, Paolo
    I-33170 Pordenone (IT)
  • Paroni, Luigi
    I-33080 Castions di Zoppola (Pordenone) (IT)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Control apparatus for a refrigerating appliance of the automatic defroster type


    (57) A control apparatus for a refrigerating appliance com­prises a commutator controlled by a timer for cyclically commutating from a first position, in which electric power is supplied to a compressor motor, to a second position in which power is supplied to an evaporator defrosting resist­ance heater via a thermostat commutator when the latter is in a position corresponding to a low temperature of the evaporator. The thermostatic commutator switches to a second position in response to sensing a higher temperature of the evaporator. The timer is supplied with electric power via the controlled commutator when the latter is in its first position, and via the series-connection of the two commutators when in their second positions. The auto­matic defrosting operation is thus carried out in accord­ance with the actual condition of the evaporator.







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