Title: Apparatus for defrosting of an evaporator in a heat pump

Abstract: In an apparatus for defrosting an evaporator in a heat pump which is driven by a compressor, the evaporator consists of a fan and a heat exchanger through which the fan drives air for heat exchange with the heat transport medium flowing through the heat exchanger. A pressure sensitive switch is arranged to actuate a member for reversal of the pumping direction of the compressor when the pressure differential .sigma. p of the air over the heat exchanger has reached a predetermined value, and a temperature sensitive switch which senses the temperature at the heat exchanger, is arranged to actuate the reversal member to maintain the reversed pumping direction of the compressor as long as the temperature at the heat exchanger is less than or equal to 0.degree. C.

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Inventors: Gustafsson, Berth Ulrik (Osterskar, SW)

Application Number: 575037
Filing Date: 1975-05-06
Publication_date: 1977-02-15
Assignee: Projectus Industriprodukter AB (Stockholm, SW)
Primary Class(es): 62/151 62/324.1
Other Classes:
US Patent Ref:

2939295	Jun, 1960	Robson	62/151.
3076316	Feb, 1963	Schlichtig	62/324.
3107499	Nov, 1963	Jokela	62/151.
3371502	Mar, 1968	Heidorn	62/324.
3465534	Sep, 1969	Sutto, Jr. et al.	62/151.
3643457	Feb, 1972	Winkler	62/151.

Other Refs:
Primary Examiner: King, Lloyd L.
Assistant Examiner:
Attorney: Toren, McGeady and Stanger