U-Line CO2175F, CLR2160 CLRCO2175, Service and Repair, General, Off Figure, Setpoint, Temperature

Section 3 - Service and Repair

CLRCO2175

GENERAL

The U-Line Model CLRCO2175 combines the best of Échelon refrigeration and clear ice-making capabilities into a single unit. A state-of-the-art microprocessor-based controller simplifies operation and troubleshooting. There are four primary modes of operation:

1.Ice Making and Refrigeration (Figure 2).

2.Ice Making and No Refrigeration (Figure 3).

3.Refrigeration and No Ice Making (Figure 4).

4.Ice Harvest/Water fill (No Refrigeration Possible) (Figure 5).

In addition, there are three sub modes of operation:

5.Off (Figure 6).

6.Water Fill - No Refrigeration (Figure 7).

7.Cleaning (No Refrigeration Possible) (Figure 8).

Review the following notes for general information before reading the schematics.

These are some additional general notes and exceptions:

•The controller has a four-minute compressor minimum off- cycle regardless of thermistor status, for compressor protection and cycling.

•When making ice, the controller reads liquid line temperature four minutes into the ice-making cycle to determine the length of that ice-making cycle and subsequent harvest length.

•Once an ice-making cycle is initiated, it will continue through to harvest regardless of the bin sensor.

•There is a three-minute water fill cycle when the unit is turned on. Mode 6.

•In order to maintain adequate refrigerator temperature, the unit will sometimes run in the refrigeration only mode, as shown in Mode 3, even if the ice bin sensor is calling for ice. At the end of each ice harvest, the controller checks the refrigerator sensor and if it is warmer than the higher of 42°F, or the set-point, it will go into refrigeration only mode. The refrigerator must be at 42° or setpoint to make ice continuously. Example:

or below the sensor. However, after the first slab of cubes is harvested, the controller will follow the logic defined in 5 above and realizing the refrigerator is too warm, will continue in refrigeration only mode (3) until the requirement is satisfied. Thus, upon start-up, the user will see one slab of ice dropped in about 30 minutes, and then there will be no more ice until the refrigerator reaches 42°F or set-point. (This may be two to three hours depending on ambient conditions.)

•There will also be a water fill cycle after the ice bin has been “full” and then calls to make ice again. This can occur when the refrigerator side is off as shown in Mode 6, or when it is on, which is shown in Mode 8. If the refrigerator side is on, when the fill cycle initiates, it will remain on until the fill cycle is completed, even if the refrigerator sensor is satisfied.

•The controller has a four-degree differential designed into it for the refrigerator sensor, such that when it is set to 38°F, the refrigerator will cool until the refrigerator sensor reads 36°F and will not re-initiate refrigerator cooling until the sensor reaches 40°F. So someone monitoring actual temperature (by pressing WARMER momentarily) may see the refrigerator off when the temperature is a degree warmer than set-point, or refrigerator on when it is a degree below set-point. Refer to Echelon Keypad.

•There is no high limit cut-out on this unit; however, if the liquid line sensor were to go out of range (approximately 185°F) the ice maker side of the unit will shut down. The refrigerator will continue to run. When the temperature of the liquid falls back in range, the unit will re-initiate operation. The unit will not normally experience this condition up to 110°F, but conditions such as door openings, heavy loading, restricted airflow, dirty condenser or direct sunlight may contribute to reaching this mode.

•Different from the earlier CLRCO2075, this unit uses two relays to control the refrigeration valves. This means that the valves will only be energized when needed.

•There is now a thermistor on the refrigerator evaporator that will sense the evaporator plate temperature. This will allow the unit to fully defrost based on temperature of the evaporator plate during the defrost modes.

Setpoint	Temperature
38°	42° or lower	ice
38°	45°	no ice
55°	55°	ice
55°	58°	no ice

There is no fill cycle when ice-making re-initiates in this case because the bin sensor has not been satisfied.

•When the initial three-minute fill cycle is complete, the unit will enter ice making and refrigeration mode (1) if the bin is empty

3-4