U-Line Echelon 2075DWRR, Service And Parts Manual Supplement

Page: 51 / 76

SERVICE NOTES
CO2075DWR
The CO2075DWR has the same basic refrigeration system as the CO2075F with a few exceptions.
• The compressor is an Embraco EMI70HER.
• The electro-mechanical gas bulb is replaced with an electronic controller which features a digital
temperature display.
• The mullion between the two drawers has a low wattage “anti sweat” surface heater to prevent con-
densation on the mullion.
• There are two interior lights and light switches. The switches are mounted in the liner in the rear
interior of the cabinet. The lights are in the housing in the top front of the drawers. The bottom light
switch controls the icemaker. When the light switch is on the icemaker stops functioning. If the drawer
is left open, the icemaker will not make ice.
General Operation Notes:
This unit is operated with a two part electronic control assembly. The main board is located in the base of
the unit behind the grille and the display board is located in the upper drawer.
The setpoint button allows the consumer to set a refrigerator temperature. The preset temperature is 38°F.
Based on the design of the mullion and chimney, there is approximately a 38°F difference between freezer
and refrigerator. While the consumer sets the refrigerator temperature the cooling system is actually
controlled by the freezer temperature. When a consumer inputs 38 for the refrigerator, the board subtracts
38 and cools the freezer to 0°F. Use these numbers as reference, but they could be 40°F and 2°F, or 36°F
and -2°F, and so on. The freezer temperature will be maintained at 0°F with a differential of 2°F. In the
event that the refrigerator is warmer than 38°F, but the freezer is 0°F or below, the cooling system will
continue to run to allow the refrigerator to cool to its setpoint. This prevents spoilage of food in the refrig-
erator. During this time, the freezer may be driven to a lower temperature which will not cause any prob-
lems. In the event the refrigerator gets to 32°F it will again override the freezer and cause the cooling sys-
tem to shut off until the temperature rises above 32°F. This prevents accidental freezing of product in the
refrigerator.
The ice maker setpoint can be reached by holding the “SET TEMP” button down for about 10 seconds. At
first SP1 will be displayed followed by SP2. Release the “SET TEMP” button and 15 should appear. This is
the default ice maker setpoint. Changing this temperature will increase or decrease production. To increase
production raise the setpoint no more than 2°F in 24 hours. Press “SET TEMP” three more times to exit this
menu.
The circuit board has a timing circuit which maintains a minimum compressor off cycle of four minutes. If
the compressor shuts off, no matter what temperature the cabinet rises to, the compressor will remain off
for four minutes to prevent compressor damage.
There is a 30 minute hot gas defrost cycle every 12 hours of clock time. The defrost cycle is automatically
operated by the circuit board. Interrupting power to the unit will reset the clock.
CO2075DWR
41
Design
■
Features
■
Performance