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DEFROSTER WITH AUXILIARY HEATER FOR DISPLAY CASES

  • US 3,839,879 A
  • Filed: 05/04/1973
  • Issued: 10/08/1974
  • Est. Priority Date: 05/04/1973
  • Status: Expired due to Term
First Claim
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1. In a refrigeration system including a compressor, a condenser, an expansion device and an evaporator arranged in series relation with the condenser being connected to the expansion device by a liquid refrigerAnt flow line, that improvement comprising an auxiliary heater connected in bypass relation to the liquid refrigerant flow line, said auxiliary heater being connected into the liquid flow line in bypass relation between the condenser and expansion device and including a normally open valve in the liquid flow line which is closed during the defrost cycle and a normally closed valve connecting the inlet side of the auxiliary heater with the liquid flow line between the condenser and the normally open valve in the liquid flow line and a normally closed valve on the discharge side of the heater communicating the discharge side of the heater with the liquid flow line between the normally open valve in the flow line and the expansion device, and bypass means associated with the expansion device for bypassing hot gaseous refrigerant around the expansion device into the evaporator.

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