×

Service station for refrigeration equipment

  • US 4,688,388 A
  • Filed: 04/29/1985
  • Issued: 08/25/1987
  • Est. Priority Date: 04/29/1985
  • Status: Expired
First Claim
Patent Images

1. Apparatus for charging refrigeration equipment comprisingvacuum and charging means including a vacuum pump, a pressurized source of refrigerant and means for selectively connecting said vacuum pump and said pressurized refrigerant source to refrigeration equipment to be charged,control means including means in an automatic mode of operation for connecting said vacuum pump to the refrigeration equipment in a first stage of said automatic mode for a preselected time duration, and for connecting said pressurized refrigerant source to the refrigeration equipment in a second stage of said automatic mode to transfer a preselected quantity of refrigerant to the refrigeration equipment,data entry and sequence control means responsive to an operator, coupled to said control means and comprising an alphanumeric keypad having first keys associated with numeric data and second keys associated with sequence commands, said control means further including means in a programming mode of operation for receiving and storing data from said data entry and sequence control means indicative of said preselected time and said preselected quantity,means coupled to said control means and to said data entry and sequence control means for selectively initiating said automatic and programming mode of operation,sequence display means for indicating mode of operation of said control means to an operator and including means coordinated with said sequence command second keys for indicating to an operator ones of said sequence command second keys to be activated for transfer between said modes of operation, andalphanumeric display means coupled to said control means, said control means including means for displaying said preselected time and quantity at said alphanumeric display means in said programming mode of operation, and means in said automatic mode of operation for initially displaying in each of said first and second stages a corresponding said preselected time and quantity at said alphanumeric display means and for thereafter decrementing said display as a function of operation to indicate progress of the corresponding said stage.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×