Method of operating a refrigerated merchandiser system

A method of operating a refrigerated merchandiser system including a display case having an evaporator, a compressor, a condenser, all connected in a refrigeration circuit containing a refrigerant, an expansion device disposed in the refrigeration circuit upstream of and in operative association with the evaporator, and an evaporator pressure control valve disposed in the refrigeration circuit downstream of and in operative association with the evaporator, comprising:

• setting the evaporator pressure control valve at a first set point pressure for a first refrigeration operating mode;
• setting the evaporator pressure control valve at a second set point pressure for a second refrigeration operating mode, the second set point pressure being higher than the first set point pressure;
• and
• sequencing between said first refrigeration mode and said second refrigeration mode.

A method of operating a refrigerated merchandiser system including a display case having an evaporator, comprising:

• passing refrigerant through said evaporator at a relatively lower temperature for a first refrigeration operating mode;
• passing refrigerant through said evaporator at a relatively higher temperature for a second refrigeration operating mode, the relatively higher being about 2 to about 12 degrees F. warmer than the relatively lower temperature;
• passing refrigerant through said evaporator at an intermediate temperature between the relatively lower temperature and the relatively higher temperature for an intermediate temperature refrigeration mode;
• and
• sequencing operation from said first refrigeration mode to said intermediate temperature refrigeration mode to said second refrigeration and thence back to said first refrigeration mode.