Sub-Zero UC-24 series Service Manual

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SUB-ZERO, INC. 2007 ALL RIGHTS RESERVED JOB AID #7003933 (Revision B - November 2007)
Under Counter
(UC-24)
Series
TTeecchhnniiccaall
SSeerrvviiccee MMaannuuaall
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Under Counter (UC-24) Series
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#7003933 - Revision B - November, 2007
ELECTRONIC CONTROL
SYSTEM INFORMATION
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Under Counter (UC-24) Series
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Figure 3-1. UC-24C Wiring Schematic
YELLOW
(WHEN USED)
CAPACITOR
COMPRESSOR
ORANGE
PURPLE
REF LIGHT SWITCH
ORANGE
WHITE
BLACK
REF FAN MOTOR
OVERLOAD
CONDENSER FAN
RED
RELAY
STARTING
RUNNING
WHITE
PIN 1
THERMISTOR
EVAPORATOR
L1
THERMISTOR CABINET/REF
DISPLAY BOARD
BLUE W/BLACK STRIPE BLUE W/BLACK STRIPE
RED
WHITE
ORANGE W/RED STRIPE
BLUE W/RED STRIPE
PIN 1
YELLOW
ORANGE
BLUE W/WHITE STRIPE
TAN
VALVE
ICEMAKER
BLUE
ICEMAKER
WHITE
WHITE
FUSE
THERMAL
BLACK
R160 OHMS
YELLOW W/WHITE STRIPE
YELLOW W/BLACK STRIPE
YELLOW W/RED STRIPE
GRAY/WHITE
GRAY/WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
J4
J5
J3
J6
J2
P3
P2
P1
P4
J5
J3
J2
J4
J6
J2
J3
P2
P1
P3
P4
M
M
M
ORANGE
PIN 1
PIN 1
PIN 1
MAIN BOARD
PIN 1
PIN 1
WHITE
REF (TOP) LIGHT
PROTECTOR
COMPRESSOR
MAIN BOARD
MEMBRANE KEYPAD
NEUTRAL
60 CYCLES
HIGH VOLTAGE SCHEMATIC
115 VO LTS
PIN 1
PIN 1
PIN 1
PIN 1
LOW VOLTAGE SCHEMATIC
PIN 1
BLUE W/WHITE STRIPE
THERMISTOR CABINET/FREEZER
R55 OHMS
DEFROST HEATER
REF AIR DUCT BAFFLE
DISPLAY
ELECTRONIC CONTROL SYSTEM OVERVIEW
Below is the wiring schematic for the model UC-24C, illustrating the components of the electronic control system.
• Manual input operations are performed at the control panel (membrane keypad).
• Temperatures and possible problems with the unit will appear in the control panel display.
• Monitoring, regulating and controlling functions take place at the main control board.
The entire electronic control system is described in greater detail on the following pages.
NOTE: For more detailed electrical diagrams refer to the wiring diagram and schematic supplied with the unit.
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Figure 3-2. Main Control Board Layout
Figure 3-3. Main Control Board Summary Table
MAIN CONTROL BOARD LAYOUT AND SUMMARY TABLE
Electrical connection points on the main control board are labeled alphanumerically. These labels correspond with the alphanumeric summary table, located on the wiring diagram. By referencing the summary table, it is possible to identify which components are connected at which points on the main control board. Below is a layout diagram of the main control board, and a copy of a model UC-24C summary table. (See Figures 3-2 & 3-3)
NOTES:
All components on the control board are non-replaceable. If a problem with the control board is identified, the complete control board must be replaced.
There is also a small control board in the control panel assembly (Not Shown). All components in the control panel assembly are non-replaceable. If a problem with the control panel is identified, the complete control panel assembly must be replaced.
J5
PIN 1
J3
TERMINAL
J5-1,2 J5-5,6 J5-3,4
CIRCUIT
120 VOLT CIRCUITS
P4 P3 P1
P2 J3-1 J3-2 J3-3 J3-4 J3-5 J3-6 J3-7 J2-1 J2-2 J2-3 J2-4
J5-7 J5-8 J6-1 J6-2 J6-3 J4-1 J4-2 J4-3 J4-4 J4-5 J4-6
LN
L1
COMPRESSOR
DEFROST
FAN 1
ICE
FAN 2
LIGHTS
R DOOR
DEF
ICE
LOW VOLTAGE THERMISTOR CIRCUITS
CAB
CAB EVAP EVAP
N C O
DISPLAY DISPLAY DISPLAY DISPLAY
J6
J4
PIN 1
PIN 1
PIN 1
P2 P1 P3 P4
MAIN CONTROL BOARD SUMMARY
DESCRIPTION
NEUTRAL POWER IN COMPRESSOR DEFROST HEATER EVAPORATOR FAN NOT USED NOT USED NOT USED NOT USED NOT USED LIGHTS
REF DOOR LIGHT SENSE DEFROST SENSOR NOT USED
NOT USED FREEZER COMPARTMENT REF COMPARTMENT EVAPORATOR EVAPORATOR BAFFLE NEUTRAL BAFFLE CLOSE BAFFLE OPEN
DISPLAY WIRING DISPLAY WIRING DISPLAY WIRING DISPLAY WIRING
FUNCTION
NEUTRAL INTO BOARD POWER INTO BOARD POWERS COMPRESSOR AND CONDENSER FAN POWERS DEFROST CIRCUIT POWERS EVAPORATOR FAN
POWERS LIGHTS
SENSES IF LOWER DOOR OPEN SENSES WHEN DEFROST HEATER SHUTS OFF
SENSES FREEZER CABINET TEMP SENSES REF CABINET TEMPERATURE SENSES EVAPORATOR TEMPERATURE SENSES EVAPORATOR TEMPERATURE BAFFLE NEUTRAL PULSED TO CLOSE NEUTRAL PULSED TO OPEN NEUTRAL
12VDC POWER SUPPLY FOR DISPLAY BOARD SERIAL DATA RECEIVE SERIAL DATE TRANSMIT GROUND FOR DISPLAY BOARD POWER SUPPLY
PIN 1
J2
COLOR
WHITE BLACK
PURPLE
BLUE
RED
YELLOW
ORANGE
GRAY/WHITE
BLUE/WHITE BLUE/BLACK
ORANGE/RED
BLUE/RED
YELLOW/RED YELLOW/BLACK YELLOW/WHITE
WHITE
RED YELLOW ORANGE
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CONTROL PANEL LAYOUT
NOTES:
• The LCD in these units is not back lit.
• Though there is a Bell icon on the LCD, there is no alarm system in the Under Counter Series. The Bell icon will only be observed during Diagnostic Mode, Manual Component Activation Mode and as a Temperature Log Event Indicator.
LCD
(GÖRÜNTÜ PANELi)
FREEZER AYAR TUSLARI
FRESH FOOD AYAR TUSLARI
Figure 3-4. UC-24C Kumanda Paneli Görünümü
LCD
(GÖRÜNTÜ PANELi)
FRESH FOOD AYAR TUSLARI
AÇ/KAPA TUSU
Figure 3-5. UC-24B, UC-24R, UC-24RO Kumanda Paneli Görünümü
AÇ/KAPA TUSU
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Adjusting Set-Point (Temperature Adjustments)
To adjust set-points, press WARMER or COLDER keys on control panel in multiple key strokes
until the desired set-
point is achieved. One key stroke equals one degree change (Fahrenheit or Celsius). (See Figure 3-7)
NOTES:
Temperature ranges are -5°F (-21°C) to +5°F (-15°C) in a freezer zone, +34°F (+1°C) to +45°F (+7°C) in a refriger­ator zone, with initial set-points of 0°F (-18°C) and +38°F (+3°C), respectively.
The initial stroke of the WARMER or COLDER keys will change previous set-point by one degree.
The set-point will be displayed on the LCD for ten (10) seconds after the last WARMER or COLDER key stroke.
After the ten (10) second delay, the zone temperature will be displayed. As the zone temperature changes, the temperature displayed on the LCD will change by no more than one (1) degree per minute.
Sekil 3-6. Cihazin çalistirilmasi ve durdurulmasi için POWER tusu kullanilir.
Sekil 3-7. Ayar yapmak için WARMER ya da COLDER tuslarini kullaniniz.
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UNIQUE ELECTRONIC CONTROL INPUT OPERATIONS
The following pages describe unique input operations that a customer typically would not perform every day. The input operations described here are Temperature Unit Selection Mode, Sabbath Mode and Showroom Mode.
Temperature Units Selection (Selecting Fahrenheit or Celsius Display - UC-24C Only)
NOTE: For Temperature Unit Selection in the models UC-24R, UC-24RO and UC-24B, see next page.
The electronic control is initially set to display temperature in Fahrenheit (°F) units of measure. Units of measure can be converted from °F to °C (Celsius), and/or back again. This operation is called Temperature Units Selection.
NOTE: Temperature Units Selection must be performed within the first (1) minute of switching the unit ON.
To convert units of measure in a model UC-24C, first press and hold the Freezer
WARMER key and the POWER
key (this actually initiates Temperature Log Recall Mode, which is covered fully, later in this section). (See Figure 3-
8) Then, press and hold the Freezer
WARMER and COLDER keys for fifteen (15) seconds and “ °C “ will appear on the LCD indicating temperatures will now be displayed in Celsius units of measure. (See Figures 3-9) To convert back to Fahrenheit units of measure, repeat the steps above.
NOTE: Temperature Units Selection Mode will end ten (10) seconds after the last key stroke.
Figure 3-9. (Model UC-24C) Convert Temperature Units of Measure
Press and Hold the Freezer
WARMER and COLDER Keys for 15 Seconds
Press & Hold
for 15 Seconds
Figure 3-8. (Model UC-24C) Initiate TLR Mode First (within first minute of switching unit ON)
Press and Hold Freezer WARMER Key, Then Press POWER Key
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Temperature Units Selection (Selecting Fahrenheit or Celsius Display - UC-24B, UC-24R, UC-24RO Only)
NOTE: For Temperature Unit Selection in the model UC-24C, see previous page.
The electronic control is initially set to display temperature in Fahrenheit (°F) units of measure. Units of measure can be converted from °F to °C (Celsius), and/or back again. This operation is called Temperature Units Selection.
NOTE: Temperature Units Selection must be performed within the first (1) minute of switching the unit ON.
To convert units of measure in these models, first press and hold the WARMER key and the POWER key (this actu­ally initiates Temperature Log Recall Mode, which is covered fully, later in this section). (See Figure 3-10) Then, press and hold the WARMER and COLDER keys for fifteen (15) seconds and “ °C “ will appear on the LCD indicat­ing temperatures will now be displayed in Celsius units of measure. (See Figures 3-11) To convert back to Fahrenheit units of measure, repeat the steps above.
NOTE: Temperature Units Selection Mode will end ten (10) seconds after the last key stroke.
Figure 3-11. (Models UC-24B, UC-24R, UC-24RO) Convert Temperature Units of Measure
Press and Hold the Refrigerator
WARMER and COLDER Keys for 15 Seconds
Fig. 3-10. (Models UC-24B, UC-24R, UC-24RO) Initiate TLR Mode First (within
first minute of switching ON)
Press and Hold WARMER Key, Then Press POWER Key
Press & Hold
for 15 Seconds
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Sabbath Mode
Sabbath Mode was incorporated into the electronic control system for the observance of certain religious days. Initiating Sabbath Mode disables the LCD and lighting system.
To initiate Sabbath Mode, the unit must first be switched OFF using the POWER key (See Figure 3-12), then press and hold the POWER key for approximately ten (10) seconds, until the LCD and lights switch OFF (See Figure 3-
13). To return to normal operation, press and release the POWER key.
NOTES:
During Sabbath Mode, the evaporator fan may function when the door is open.
During Sabbath Mode, the LCD is disabled and set-points cannot be changed.
The icemaker in the model UC-24C is fed direct from L1, so icemaker operation is not affected by Sabbath Mode.
The Model UC-24B utilizes a rocker switch at the top of the compartment for controlling the accent lights. This
accent lighting system is not affected by Sabbath Mode because its power comes direct from L1.
Figure 3-13. After Unit is Switched OFF, Press and Hold POWER Key for 10 Seconds
Figure 3-12. To Enter Sabbath Mode, Switch Unit OFF First
Press and hold for 10 seconds
Press and release, switching unit OFF
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Showroom Mode
Showroom Mode was incorporated into the electronic control system so these appliances could be displayed in a showroom setting. When in Showroom Mode, all cooling functions are disabled, but the lighting system and LCD remain active.
To initiate Showroom Mode, the unit must first be switched OFF using the POWER key (See Figure 3-14). With the unit switched OFF, press and hold either pair of WARMER and COLDER keys, then press the POWER key, then release all three keys (See Figure 3-15).
To return unit to normal operating condition, repeat the steps above.
NOTES:
Always check set-points after returning unit to normal operating condition.
It is possible to determine if a unit is in Showroom Mode by initiating Diagnostic Mode. If “Sr” is observed in the
left temperature display area during Diagnostic Mode, the unit is in Showroom mode. Initiating Diagnostic Mode is covered later in this section.
Figure 3-15. After Unit is Switched OFF, Press and Hold the WARMER and COLDER Keys,
Then Press the POWER Key
Figure 3-14. To Enter (or Exit) Showroom Mode, Switch Unit OFF First
Press and release, switching unit OFF
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FUNCTIONS OF ELECTRONIC CONTROL SYSTEM
The following few pages explain monitoring, regulating and controlling functions of the electronic control system.
Display Zone Temperatures
The temperature signals from the thermistors in the refrigerator and freezer compartments are monitored by the microprocessor and then displayed on the LCD. Though the compartment air temperature does fluctuate, the LCD displays the “average” temperature (See Figure 3-16).
NOTE: If zone temperature changes, temperature display will change by one degree per minute.
Figure 3-16. Display Zone Temperatures
“average” temperature displayed
Figure 3-17. UC-24B Signal Trace Schematic (High Voltage) of Lighting System
RELAY
STARTING
(WHEN
USED)
CAPACITOR
COMPRESSOR
REF LIGHT
SWITCH
WHITE
BLACK
PROTECTOR
M
M
M
ORANGE
PURPLE
ORANGE
PIN 1
PIN 1
PIN 1
YELLOW
MAIN BOARD
PIN 1
ORANGE
PIN 1
WHITE
REF (TOP)
LIGHT
REF FAN MOTOR
OVERLOAD
CONDENSER FAN
RED
COMPRESSOR
RUNNING
WHITE
NEUTRAL
HIGH VOLTAGE SCHEMATIC
L1
115 VOLTS 60 CYCLES
LIGHTS
PINK
WHITE
REF LIGHT
SWITCH
LIGHT TUBE SWITCH
(UC-24B ONLY)
J4
J5
J3
J6
J2
P3
P2
P1
P4
Supply Power to the Lighting System
Power is supplied to the lighting system through the control board when the unit is switched ON by pressing the POWER key. With the door open, the light switch allows power to the lights. (See Figure 3-17).
NOTES:
Power to the lights is monitored by the microprocessor to control evaporator fan motor operation.
When in Sabbath Mode, the lighting system is disabled. Sabbath Mode was covered earlier in this section.
The accent lighting system in the model UC-24B is fed direct from L-1.
2. Power supplied to lighting sys­tem unless unit is switched OFF, or in Sabbath Mode.
NOTE: Light switch position monitored to control fan operation.
1. Power supplied to control board.
NOTE: Accent lighting system in UC-24B is fed direct from L1.
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Regulate Freezer Zone Temperature (UC-24C Only)
When the freezer compartment thermistor detects high off-set temperature, calling for cooling, the compressor and condenser fan motor are energized, as well as the evaporator fan motor. (See Figure 3-18)
If the door is opened while the evaporator fan is operating, the microprocessor will detect the power signal to the lights and cut power to the fan.
NOTES:
• When the freezer compartment calls for cooling after a defrost, the evaporator fan will not be allowed to run until the thermistor on the evaporator drops to 35°F (2°C).
If compartment tem-
perature exceeds either high or low offset the tempera­ture display will change by one degree (1°) per minute.
If freezer compart­ment thermistor is faulty, compressor operation defaults to twenty (20) minutes ON, twenty (20) min­utes OFF cycling; EE appears in left of LCD; SERVICE flashes and Error Code 07 is logged.
If evaporator ther­mistor is faulty, the compressor will be energized after the dwell time and the evaporator fan will be energized 3 min­utes later; SERVICE flashes and Error Code 08 is logged.
When in Sabbath Mode, the freezer compartment ther­mistor still controls compressor opera­tion, except there is a random fifteen (15) to twenty-five (25) second delay before the compres­sor is energized.
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Figure 3-18. UC-24C Signal Trace - Regulate Freezer Zone Temperature
1. Freezer compartment thermistor at high off-set temp. calling for cooling.
4. Evap fan energized.
2. Compressor and con­denser fan energized.
3. Door is closed, so no power to lights. This is monitored via the orange wire.
LOW VOLTAGE SCHEMATIC
REF AIR DUCT BAFFLE
YELLOW W/WHITE STRIPE
YELLOW W/BLACK STRIPE
YELLOW W/RED STRIPE
J2
PIN 1
MEMBRANE KEYPAD
MAIN BOARD
J2
PIN 1
THERMISTOR CABINET/FREEZER
DISPLAY
DISPLAY BOARD
THERMISTOR CABINET/REF
THERMISTOR
EVAPORATOR
PIN 1
J3
WHITE
BLUE W/RED STRIPE
ORANGE W/RED STRIPE
BLUE W/WHITE STRIPE BLUE W/WHITE STRIPE
BLUE W/BLACK STRIPE BLUE W/BLACK STRIPE
YELLOW
RED
HIGH VOLTAGE SCHEMATIC
115 VOLTS 60 CYCLES
ORANGE
PIN 1
J6
J4
PIN 1
PIN 1
J5
PIN 1
ORANGE
J6
J5
J2
PIN 1
MAIN BOARD
PIN 1
J4
PIN 1
PIN 1
GRAY/WHITE
P4
P3
P1
P2
PIN 1
L1
NEUTRAL
WHITE
WHITE
BLACK
PURPLE
BLUE
RED
J3
YELLOW
ORANGE
REF LIGHT SWITCH
GRAY/WHITE
DEFROST HEATER
REF (TOP) LIGHT
OVERLOAD
PROTECTOR
M
CONDENSER FAN
R55 OHMS
COMPRESSOR
M
REF FAN MOTOR
M
RUNNING
CAPACITOR
COMPRESSOR STARTING RELAY
WHITE
WHITE
(WHEN USED)
WHITE
WHITE
WHITE
WHITE
ORANGE
BLACK
THERMAL
FUSE
ICEMAKER
WHITE
TAN
ICEMAKER
VALVE
R160 OHMS
WHITE
P4
P3
P1
P2
J3
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Regulate Refrigerator Zone Temperature (UC-24C Only)
When the thermistor in refrigerator compartment reaches high off-set temperature, calling for cooling, the micro­processor sends an 18 Volt pulse signal to the air baffle control to open, regardless of operational state of the com­pressor. When calling for cooling, the microprocessor repeats sending a pulse signal every five (5) minutes to the air baffle control to open. (See Figure 3-19)
When the refrigerator compartment thermistor detects low off-set temperature, the microprocessor sends an 18 Volt pulse signal to the air baffle control to close. Whenever the refrigerator compartment is not calling for cooling, the microprocessor repeats sending a pulse signal every five (5) minutes to the air baffle control to close.
NOTES:
If compartment tem­perature exceeds either high or low offset the tempera­ture display will change by one degree (1°) per minute.
If refrigerator com­partment thermistor is faulty, air baffle defaults to twenty (20) minutes open, forty (40) minutes closed cycling; EE appears in right of LCD; SERVICE flashes and Error Code 05 is logged.
When in Sabbath Mode, refrigerator compartment ther­mistor still controls baffle operation except there is a random fifteen (15) to twenty-five (25) second delay before the baffle is ener­gized.
Figure 3-19. UC-24C Signal Trace - Regulate Refrigerator Zone
1. Refrigerator compartment thermistor at high off-set temp. calling for cooling.
2. Pulse signal to air baffle control every 5 minutes.
LOW VOLTAGE SCHEMATIC
MEMBRANE KEYPAD
PIN 1
THERMISTOR CABINET/FREEZER
REF AIR DUCT BAFFLE
DISPLAY
DISPLAY BOARD
THERMISTOR CABINET/REF
THERMISTOR
EVAPORATOR
PIN 1
J2
J3
YELLOW W/WHITE STRIPE
YELLOW W/BLACK STRIPE
YELLOW W/RED STRIPE
WHITE
BLUE W/RED STRIPE
ORANGE W/RED STRIPE
BLUE W/WHITE STRIPE BLUE W/WHITE STRIPE
BLUE W/BLACK STRIPE BLUE W/BLACK STRIPE
J2
PIN 1
MAIN BOARD
PIN 1
J6
ORANGE
YELLOW
RED
J4
PIN 1
PIN 1
J5
P4
P3
P1
P2
PIN 1
HIGH VOLTAGE SCHEMATIC
ORANGE
GRAY/WHITE
115 VOLTS 60 CYCLES
L1
NEUTRAL
WHITE
WHITE
J6
J4
J5
J2
PIN 1
MAIN BOARD
PIN 1
PIN 1
PIN 1
PIN 1
WHITE
P4
BLACK
P3
PURPLE
P1
BLUE
P2
J3
YELLOW
ORANGE
REF LIGHT SWITCH
GRAY/WHITE
RED
OVERLOAD
PROTECTOR
CONDENSER FAN
DEFROST HEATER
R55 OHMS
REF (TOP) LIGHT
M
COMPRESSOR
M
REF FAN MOTOR
RUNNING
CAPACITOR
(WHEN USED)
COMPRESSOR STARTING RELAY
WHITE
WHITE
M
WHITE
WHITE
WHITE
J3
ORANGE
BLACK
THERMAL
FUSE
ICEMAKER
WHITE
TAN
ICEMAKER
VALVE
R160 OHMS
WHITE
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Regulate Refrigerator Zone Temperature (UC-24B, UC-24R, UC-24RO)
When the refrigerator compartment thermistor detects high off-set temperature, calling for cooling, the evaporator fan is energized, but the compressor and condenser fan are not allowed to run until the thermistor on the evaporator rises to 38°F (3°C). (See Figure 3-20)
If the door is opened while the evaporator fan is operating, the microprocessor will detect the power signal to the lights and cut power to the fan.
NOTES:
If compartment temperature exceeds either high or low offset the temperature display will change by one degree (1°) per minute.
If refrigerator com­partment thermistor is faulty, compressor operation defaults to twenty (20) minutes ON, forty (40) min­utes OFF cycling; EE appears in right of LCD; SERVICE flashes and Error Code 05 is logged.
If evaporator ther­mistor is faulty, the compressor will not energize until zone air temperature exceeds high offset by 5°F (3°C); SER­VICE flashes and Error Code 06 is logged.
When in Sabbath Mode, the refrigera­tor compartment thermistor still con­trols compressor operation, except there is a random fif­teen (15) to twenty­five (25) second delay before the compressor is ener­gized.
Figure 3-20. UC-24B Signal Trace - Regulate Refrigerator Zone
1. Compartment thermistor at high off-set temp. calling for cooling.
4. Evap Thermistor above 38°F (3°C).
3. Evap fan energized.
2. Door is closed, so no power to lights. This is monitored via the orange wire.
5. Compressor and con­denser fan energized.
LOW VOLTAGE SCHEMATIC
DISPLAY
DISPLAY BOARD
HIGH VOLTAGE SCHEMATIC
ORANGE
J6
J4
J5
J2
PIN 1
MAIN BOARD
PIN 1
PIN 1
PIN 1
PIN 1
WHITE
P4
BLACK
P3
P1
P2
J3
MEMBRANE KEYPAD
115 VOLTS 60 CYCLES
L1
YELLOW
J2
PIN 1
PIN 1
J3
THERMISTOR EVAPORATOR
THERMISTOR REFRIGERATOR
NEUTRAL
WHITE
PURPLE
RED
ORANGE
REF LIGHT
SWITCH
ORANGE
YELLOW
RED
WHITE
BLUE W/RED STRIPE
ORANGE W/RED STRIPE
BLUE W/BLACK STRIPE BLUE W/BLACK STRIPE
REF LIGHT
SWITCH
PINK
LIGHT TUBE SWITCH
(UC-24B ONLY)
LIGHTS
OVERLOAD
REF (TOP)
LIGHT
PROTECTOR
CONDENSER FAN
COMPRESSOR
M
M
M
REF FAN MOTOR
J6
J5
WHITE
J2
MAIN BOARD
J4
PIN 1
PIN 1
RUNNING
CAPACITOR
COMPRESSOR STARTING RELAY
PIN 1
PIN 1
WHITE
(WHEN USED)
P4
P3
P1
P2
PIN 1
J3
ORANGE
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Minimize Condensation on Refrigerator Door Glass (UC-24B Only)
To help minimize the formation of condensation, or fog, on the door glass of the model UC-24B, the microprocessor detects when the refrigerator door is opened, via the light switch, then when the door closes, the evaporator fan is energized for five (5) minutes, regardless of compressor operational state. This draws any warmer moist air away from the door glass. (See Figure 3-21)
NOTE: The evaporator fan also cycles with the compressor.
Figure 3-21. UC-24B Signal Trace Schematic - Evaporator Fan Operation in Glass Door Unit
2. Evap fan energized for 5 minutes.
1. Door is opened, then closed. This is monitored via the orange wire.
HIGH VOLTAGE SCHEMATIC
ORANGE
J2
PIN 1
MAIN BOARD
J6
J5
PIN 1
J4
PIN 1
PIN 1
ORANGE
PIN 1
115 VOLTS 60 CYCLES
L1
WHITE
P4
BLACK
P3
P1
P2
NEUTRAL
PURPLE
RED
REF LIGHT
LIGHT TUBE SWITCH
(UC-24B ONLY)
WHITE
SWITCH
OVERLOAD
PROTECTOR
CONDENSER FAN
PINK
M
LIGHTS
COMPRESSOR
M
REF FAN MOTOR
M
WHITE
RUNNING
CAPACITOR
COMPRESSOR STARTING RELAY
WHITE
(WHEN USED)
J3
YELLOW
ORANGE
REF LIGHT
SWITCH
REF (TOP)
LIGHT
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Monitor and Control Freezer “Adaptive Defrost” (UC-24C Only)
Initially, the compressor will cycle-run for 12 hours, after which the microprocessor sends a signal to the defrost relay on the control board to close. This supplies power to the defrost heater. At the same time the compressor, con­denser fan and evaporator fan are switched off.
With the “Adaptive Defrost” technique, the length of time that the defrost heater stays on to open the defrost termina­tor bimetal (70°F/21°C), is observed by the microprocessor via the grey w/white stripe wire to J2.
The microprocessor then determines the number of hours before the next defrost. If the heater stays on for a short­er time than specified, the microprocessor increases the next defrost interval. If the heater stays on longer than specified, the electronic control decreases the next defrost interval. (See Figure 3-22) This is an ongoing process whereby the defrost time and the defrost interval will vary by unit use.
NOTES:
A five (5) minute time delay/dwell follows all defrosts. At the end of the five (5) minute dwell, the compressor and condenser fan are energized, but the evaporator fan will not be energized until the evaporator temperature falls below 35°F (2°C).
The minimum defrost interval is six (6) hours of compressor run time; the maximum defrost interval is eighty (80) hours of compressor run time; the maximum defrost duration is twenty-five (25) minutes plus five (5) minute dwell.
If the grey w/white wire defrost sensing line is open, defrost operation defaults to twenty-five (25) minute defrost time and 6 hour build time, and Error Code 22 is logged. If the evaporator thermistor detects an underheat or overheat situation at the same time, Error Codes 20 or 23 will be registered, respectively.
During defrost, the display temperature is locked.
Figure 3-22. UC-24C Signal Trace Schematic - Adaptive Defrost
1. Compressor runs 12 hours, then switched off.
2. Defrost circuit energized.
3. Terminator opens at 70°F (21°C)
4. Defrost duration observed, interval between next defrost adjusted.
HIGH VOLTAGE SCHEMATIC
ORANGE
J6
J5
J2
PIN 1
MAIN BOARD
PIN 1
J4
PIN 1
PIN 1
GRAY/WHITE
PIN 1
ORANGE
115 VOLTS 60 CYCLES
L1
NEUTRAL
WHITE
WHITE
P4
BLACK
P3
PURPLE
P1
BLUE
P2
RED
J3
YELLOW
ORANGE
REF LIGHT SWITCH
THERMAL
FUSE
BLACK
GRAY/WHITE
CONDENSER FAN
DEFROST HEATER
R55 OHMS
REF (TOP) LIGHT
ICEMAKER
WHITE
TAN
OVERLOAD
PROTECTOR
M
COMPRESSOR
M
REF FAN MOTOR
ICEMAKER
VALVE
R160 OHMS
M
WHITE
RUNNING
CAPACITOR
COMPRESSOR STARTING RELAY
WHITE
WHITE
(WHEN USED)
WHITE
WHITE
WHITE
WHITE
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Monitor and Control Refrigerator Fan-Assisted, Off-Cycle Defrost (UC-24B, UC-24R, UC-24RO)
Temperature signals from the compartment and evaporator thermistor’s are observed by the microprocessor. During off cycle defrost, if a refrigerator compartment temperature reaches high offset (calling for cooling) before evaporator temperature rises to 38°F (3°C), no power will be supplied to the compressor. But, the evaporator fan will be switched ON. Once the evaporator temperature reaches 38°F (3°C), normal cooling functions begin. (See Figure 3-
23).
NOTES:
If refrigerator compartment thermistor is faulty, compressor operation defaults to twenty (20) minutes ON, forty (40) minutes OFF cycling; EE appears in right of LCD; SERVICE will flash and Error Code 05 will be logged.
If evaporator thermistor is faulty, the compressor will not energize until zone air temperature exceeds high offset by 5°F (3°C); SERVICE flashes and Error Code 06 is logged.
When in Sabbath Mode, the refrigerator compartment thermistor still controls compressor operation, except there is a random fifteen (15) to twenty-five (25) second delay before the compressor is energized.
Figure 3-23. UC-24B Signal Trace - Refrigerator Fan Assisted Off-Cycle Defrost
1. Compartment thermistor at high off-set temp. calling for cooling.
4. Evap Thermistor below 38°F (3°C).
3. Evap fan energized.
2. Door is closed, so no power to lights. This is monitored via the orange wire.
5. Compressor and condens­er fan stay OFF until evap rises to 38°F (3°C).
J2
P4
P3
P1
P2
PIN 1
J3
LOW VOLTAGE SCHEMATIC
DISPLAY
MEMBRANE KEYPAD
DISPLAY BOARD
PIN 1
THERMISTOR EVAPORATOR
THERMISTOR REFRIGERATOR
PIN 1
PIN 1
MAIN BOARD
J2
ORANGE
YELLOW
J3
BLUE W/RED STRIPE
ORANGE W/RED STRIPE
BLUE W/BLACK STRIPE BLUE W/BLACK STRIPE
WHITE
RED
PIN 1
J6
J4
PIN 1
PIN 1
J5
HIGH VOLTAGE SCHEMATIC
L1
ORANGE
J6
J4
J5
J2
PIN 1
MAIN BOARD
PIN 1
PIN 1
PIN 1
ORANGE
PIN 1
WHITE
P4
BLACK
P3
P1
P2
J3
YELLOW
115 VOLTS 60 CYCLES
NEUTRAL
PURPLE
ORANGE
REF LIGHT
REF LIGHT
LIGHT TUBE SWITCH
(UC-24B ONLY)
WHITE
RED
SWITCH
SWITCH
REF (TOP)
LIGHT
OVERLOAD
PROTECTOR
CONDENSER FAN
M
PINK
LIGHTS
COMPRESSOR
M
REF FAN MOTOR
M
WHITE
RUNNING
CAPACITOR
COMPRESSOR STARTING RELAY
WHITE
(WHEN USED)
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Monitor Compressor Run Duration, Displays If Service is Needed
The microprocessor observes the state of the compressor relay to determine the length of compressor run time (See Figure 3-24). If the compressor runs 100% (Freezer = 6 hours, Refrigerator = 4 hours), an error code is logged (EC 40, or EC 50, respectively), and defrost will be initiated, but SERVICE will not
flash.
If several 100% compressor run periods occur, and the door was not opened during the last excessive compressor run period, and the temperature in the zone is not able to fall half way between the set point and the low off-set, then SERVICE will flash (See Figure 3-25).
NOTES:
• After the problem is corrected, the error code must be cleared from memory, otherwise a non-flashing “SERVICE” will display constant on the LCD. See “Clearing Non-Flashing “SERVICE” and Error Codes” later in this section.
• If the unit is ever switched OFF then back ON, the compressor will not energize for at least three (3) minutes. This three (3) minute minimum OFF time is used to protect the compressor and its electricals.
Figure 3-25. Service Flashing if several 100% compressor run periods occurred, the door was not opened
during last excessive run period, and temperature is not able to fall half way between set point & low off-set.
Figure 3-24. UC-24C Signal Trace Schematic - Compressor Run
Compressor relay closed, allowing power to compressor. This is observe by micro­processor.
HIGH VOLTAGE SCHEMATIC
ORANGE
J2
PIN 1
MAIN BOARD
PIN 1
J6
J4
PIN 1
PIN 1
J5
PIN 1
ORANGE
GRAY/WHITE
P4
P3
P1
P2
J3
115 VOLTS 60 CYCLES
L1
WHITE
BLACK
PURPLE
BLUE
YELLOW
NEUTRAL
RED
ORANGE
REF LIGHT SWITCH
THERMAL
FUSE
BLACK
GRAY/WHITE
WHITE
ICEMAKER
OVERLOAD
PROTECTOR
CONDENSER FAN
DEFROST HEATER
R55 OHMS
REF (TOP) LIGHT
WHITE
TAN
M
COMPRESSOR
M
REF FAN MOTOR
ICEMAKER
VALVE
R160 OHMS
WHITE
RUNNING
CAPACITOR
(WHEN USED)
COMPRESSOR STARTING RELAY
WHITE
WHITE
M
WHITE
WHITE
WHITE
WHITE
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POSSIBLE ERROR INDICATORS
The diagrams on this page illustration what a customers may see on the LCD if a problem/error exists with the unit.
NOTE: Error code must be cleared from memory after problems are corrected, otherwise a non-flashing “SERVICE” will display constant on the LCD. See “Clearing Non-Flashing “SERVICE” and Error Codes” later in this section.
Figure 3-27.
“EE” Displayed at Right & “SERVICE” Flashing = Refrigerator Compartment Thermistor (or its Wiring) Fault
Figure 3-26.
“EE” Displayed at Left & “SERVICE” Flashing = Freezer Compartment Thermistor (or its Wiring) Fault
Figure 3-29.
Service Flashing = Several 100% run periods, the door was not open during last 100% run period, and zone
temperature not able to fall half way between set point and low off-set.
Figure 3-30.
“SERVICE” Steady, not Flashing = Error Codes Observed in Diagnostic Mode, but not Cleared
Figure 3-28.
Service Flashing = Evaporator Thermistor (or its Wiring) Fault
Figure 3-31.
“ - - ” (Double Dashes) Displayed = Model Configuration was not Performed
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Models UC-24R, UC-24RO
THERMISTOR LOCATION CODE
Refrigerator Compartment r
Evaporator E
ELECTRONIC CONTROL TROUBLESHOOTING INPUT OPERATIONS
The following few pages explain troubleshooting input operations performed at the control panel. The input opera­tions described are Diagnostic Mode, Manual Component Activation Mode and Temperature Log Recall.
Diagnostic Mode (a.k.a. Actual Temperature Display Mode)
Initiating Diagnostic Mode allows the Service Technician to observe real-time temperature readings from all thermis­tors without temperature averaging.
To initiate Diagnostic Mode, the unit must be ON, then press and hold either
COLDER key, and press the POWER key, then release both keys (See Figure 3-32). The left display area will show the real-time temperature of the ther­mistor, the right display area will show the thermistor location code, and all LCD indicators will illuminate. Pressing either
COLDER key while in Diagnostic Mode will toggle forward (increment) to the next thermistor location (See Figures 3-33 & 3-34), while pressing either WARMER key will toggle backward (decrement) to the previous thermis­tor location.
NOTE: If the COLDER and POWER keys are pressed and held for ten (10) seconds, Manual Component Activation Mode will be initiated (this is covered later in the section).
NOTE: Diagnostic Mode will end twenty (20) seconds after the last key stroke.
Figure 3-32. Initiate Diagnostic Mode - Press and Hold Either
COLDER Key, Then POWER Key
(“F” Indicates Freezer Zone/Compartment)
Figure 3-33. Toggle Through Temperature Readings - Press Either COLDER Key
(“r” Indicates Refrigerator Zone/Compartment)
Figure 3-34. Toggle Through Temperature Readings - Press Either COLDER Key
(“E” Indicates Evaporator)
Model UC-24C
THERMISTOR LOCATION CODE
Freezer Compartment F
Refrigerator Compartment r
Evaporator E
Model UC-24B
THERMISTOR LOCATION CODE
Beverage Compartment r
Evaporator E
THERMISTOR LOCATION CODE TABLES
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Figure 3-35. “EE” Observed in Diagnostic Mode = Thermistor Fault in Location Indicated by Code
Figure 3-36. “Sr” Observed While in Diagnostic Mode = Unit is in Showroom Mode
If “Sr” is observed at left display area during Diagnostic Mode, the unit is in Showroom Mode, which was explained earlier in this section (See Figure 3-36).
If “EC” is observed in the right display area during Diagnostic Mode, the numbers at left are “Error Codes” (See Figure 3-37). Error Codes indicate problems registered by specific components. If error codes are registered, they will appear before temperature readings and can be toggled through with the temperature readings as described on the previous page. (See Error Code Table below and instructions on clearing Error Codes on next page.)
Figure 3-37. “EC” Observed While in Diagnostic Mode = Error Code
(See table below & how to clear Error Codes on next Page)
Error Code Table
CODE INDICATION
05 Refrig. cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
06 Refrig. evaporator thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
07 Freezer cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
08 Freezer evaporator thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
20 Defrost under-heat with no voltage feedback through Gray/White wire at defrost start
21 Defrost overheat
22 No voltage feedback through Gray/White wire at defrost start
23 Defrost overheat with no voltage feedback through Gray/White wire at defrost start
24 Defrost under-heat
30 NA
40 Excessive Freezer Compressor Run (UC-24C Only)
50 Excessive Refrigerator Compressor Run (UC-24B, UC-24R and UC-24RO Only)
Diagnostic Mode Indicators
If “EE” is observed in left display area during Diagnostic Mode, the thermistor in that location is open or shorted, or there is a break in that thermistor’s wiring (See Figure 3-35).
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Clearing Non-Flashing “SERVICE” and Error Codes
If Error Codes are observed in Diagnostic Mode, a non-flashing
SERVICE icon will appear on the LCD when Diagnostic Mode ends, indicating error codes are still stored (See Figure 3-38). To clear a non-flashing SERVICE icon and the error codes, the problem must be corrected and the unit must be ON, then:
On a model UC-24C: Press the Freezer
WARMER and COLDER keys for fifteen (15) seconds, and the error
codes are cleared. (See Figure 3-39)
On a model UC-24B, UC-24R or UC-24RO: Press the Refrigerator
WARMER and COLDER keys for fifteen (15)
seconds, and the error codes are cleared. (See Figure 3-40)
Figure 3-38. Non-flashing SERVICE after Diagnostic Mode = Error Codes are Stored
Figure 3-39. (Model UC-24C) Clear Non-Flashing SERVICE.
With Unit ON, Press and Hold the Freezer WARMER and COLDER Keys for 15 Seconds
Figure 3-40. (Model UC-24B, UC-24R, UC-24RO) Clear Non-Flashing SERVICE.
With Unit ON, Press and Hold the Refrigerator
WARMER and COLDER Keys for 15 Seconds
UC-24C:
Press & Hold
for 15 Seconds
UC-24R, UC-24RO, UC-24B:
Press & Hold
for 15 Seconds
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Figure 3-41. (Model UC-24C) Initiate Manual Component Activation Mode (Freezer Zone Shown) -
Press and Hold Freezer COLDER Key and POWER Key for 10 Seconds
Manual Component Activation Mode
Manual Component Activation Mode energizes the cooling system for five (5) minutes, allowing a Service Technician to check for proper voltage readings at activated components without having to wait for the zone to call for cooling.
To initiate Manual Component Activation Mode the unit must be ON, then press and hold the desired COLDER key and the POWER key for ten (10) seconds (See Figures 3-41 and 3-42). All cooling functions for that zone will begin and the zone compartment temperature will be displayed in the left display area of the LCD, with the right display area showing the thermistor location.
NOTES:
If a COLDER and the POWER keys are pressed and held for less than
ten (10) seconds, Diagnostic Mode will be
initiated. This was covered earlier in the section.
• In the model UC-24C, if the refrigerator
COLDER key and POWER key are pressed for ten (10) seconds, the baf­fle control will energize, but the compressor, condenser fan motor and evaporator fan motor will switch to OFF mode.
It is possible to toggle through the other temperature readings as in Diagnostic Mode, but in this case the temper-
ature readings will last for five (5) minutes rather than twenty seconds.
•The compressor overload could prevent the compressor from energizing.
Manual Component Activation Mode will end five (5) minutes after it is initiated. It is possible to end this five (5)
minute run time and return to normal operation by pressing the POWER key. If this is done, note that the electron­ic control will observe a three (3) minute minimum compressor OFF time when the unit is switched back ON. This is to protect the compressor and its electricals.
Press and hold for 10 seconds
Figure 3-42. (Models UC-24B, UC-24R, UC-24RO) Initiate Manual Component Activation Mode -
Press and Hold COLDER Key and POWER Key for 10 Seconds
Press and hold for 10 seconds
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Temperature Log Recall Mode
The electronic control system is equipped with a temperature history data storage system. This system logs/stores the average temperature of each individual thermistor every two hours, along with any event indicators (explained later in this section), that may have occurred. These two-hour periods are referred to as “indexes”. Up to 168 indexes can be stored for each compartment, making it possible to observe the preceding fourteen days of the unit’s temperature history (each index equals 2 hour temperature average; 2 hours X 168 indexes = 14 days). After 168 indexes are stored, each new index will bump the oldest index. Index number “1” being the most recent two-hour temperature average and index number “168” being the oldest. Accessing this temperature history data so it can be viewed on the LCD is accomplished by initiating Temperature Log Recall Mode.
There are two ways to initiate Temperature Log Recall Mode. One allows viewing of compartment temperature his­tory only (see below), the other allows viewing of compartment temperature history and/or evaporator temperature history (see following page).
Initiate Temperature Log Recall Mode To View Compartment Temperature History Only: Begin with the unit ON. Now, press and hold the desired compartment WARMER key, then press the POWER key, then release both keys (See Figure 3-43). The left display area on the LCD will show average compartment temperature and in the right display area will be the index number. The first index number will be “1”, indicating the most recent two-hour temperature average. The right display area will also flash the thermistor location code at 3 second intervals (See Figure 3-44).
Figure 3-43. Initiate Temperature Log Recall Mode To View Compartment Temperature History Only -
Press and Hold Desired
WARMER Key, Then Press POWER Key
Figure 3-44. Thermistor Location Code Flashes Every 3 Seconds
Figure 3-45. Toggle Up (Increment) Through Indexes - Press WARMER Key in Consecutive Key Strokes
Figure 3-46. Toggle Down (Decrement) Through Indexes - Press COLDER Key in Consecutive Key Strokes
To toggle up (increment) through the indexes (from 1 to 168), press the same WARMER key in multiple key strokes (See Figure 3-45). To toggle down (decrement) through the indexes (from 168 to 1), press the corresponding COLDER key in multiple key strokes (See Figure 3-46).
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Figure 3-49. Initiate Temperature Log Recall Mode To View Temperature History -
Press and Hold POWER key first, then WARMER Key
Figure 3-47. Initiate Diagnostic Mode - Press and Hold Either COLDER Key, then the POWER Key
Figure 3-48. Toggle Through Readings - Press COLDER or WARMER Key Until Desired Thermistor
Temperature is Displayed
Initiate Temperature Log Recall Mode To View Compartment and Evaporator Temperature History: To view compartment and/or evaporator temperature history, begin with the unit ON and in Diagnostic Mode (See Figure 3-
47). While in Diagnostic Mode, toggle through the readings until the desired thermistor temperature is displayed on the LCD (See Figure 3-48). Now, press and hold the POWER key first, then the WARMER key, then release both keys (See Figure 3-49). The left display area on the LCD will show average temperature and in the right display area will be the index number “1” indicating the most recent two-hour temperature average. The right display area will also flash the thermistor location code at 3 second intervals (See Figure 3-50).
Figure 3-50. Thermistor Location Code Flashes Every 3 Seconds
Figure 3-51. Toggle Up Through Indexes - Press WARMER Key in Consecutive Key Strokes
Figure 3-52. Toggle Down Through Indexes - Press COLDER Key in Consecutive Key Strokes
To toggle up
(increment) through the indexes (from 1 to 168), press the same WARMER key in multiple key strokes
(See Figure 3-51). To toggle down
(decrement) through the indexes (from 168 to 1), press the corresponding
COLDER key in multiple key strokes (See Figure 3-52).
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Figure 3-54. SERVICE Illuminates -
Indicates Unit was switched OFF During that Index Period by Pressing POWER Key
Figure 3-55. Bell Illuminates - Indicates Power Failure / Interruption During that Index Period
NOTES:
If the unit was in Showroom Mode during any of the 168 indexes, average temperatures will continue to be logged. No event indicator will appear with these temperatures.
If the unit was switched OFF by pressing the POWER key during any of the 168 indexes and there was still power supplied to the control board, the average temperatures will continue to be logged. This means temperatures would be expected to rise and the SERVICE icon would be present in all indexes in which the unit was OFF.
Temperature Log Recall Mode will end twenty (20) seconds after the last key stroke.
Temperature Log Event Indicators
The diagrams below illustrate possible event indicators that may be observed while in Temperature Log Recall Mode. (See Figures 3-53 through 3-55 and Temperature Log Index Chart on next page)
Figure 3-53. “bl” Indicates Index is “blank
” - No Temperature has Been Logged Yet
(Only possible within first 14 days of unit operation, or after new control board is installed during service)
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br 700BR
bC 700BC
27 427R bF 700BFI
2r UC-24R / UC-24RO
2C UC-24C
2b UC-24B
iLK KEZ TAKILAN ELEKTRONIK KARTLAR iÇiN KULLANILAN KART UYGULAMA PROSEDÜRÜ
Sekil 3-56. “ - - ” Çift kisa çizgi görünür = Model kodu girilmeye hazirdir.
Sekil 3-57. WARMER ya da COLDER tusuna basarak Model numarasini seçiniz.
Sekil 3-58. Aradiginiz modeli panelde görünce durunuz.
Sekil 3-59. POWER tusuna basarak onaylayip çalistiriniz.
MODEL KOD TABLOSU
KOD MODEL
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Press and hold for 15 seconds
br 700BR
bC 700BC
27 427R bF 700BFI
2r UC-24R / UC-24RO
2C UC-24C
2b UC-24B
EL YARDIMIYLA ÇALISMA SEKLi DEGiSTiRME YÖNTEMi (Daha önceden elektrik enerjisi girmis olan-kullanilmis kartlar için uygulanir)
Sekil 3-60. Ekran görüntüsü degisinceye kadar COLDER ve POWER dügmelerine basili tutunuz.
Sekil 3-61. Ekran degisinceye kadar 15 Saniye boyunca araliksiz olarak POWER dügmesini basili tutunuz.
Sekil 3-62. Ekran degisince WARMER ya da COLDER tusu ile istediginiz modeli seciniz.
Sekil 3-63. istediginiz model kodunu ekranda görünce durunuz
Sekil 3-64. POWER dügmesine basarak çalistiriniz.
MODEL KOD TABLOSU
KOD MODEL
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With unit ON, press and
hold for 5 seconds
DIS MÜDAHALE iLE DEFROST YAPTIRMA iSLEMi (YALNIZ UC-24C)
Sekil 3-65. Frezer bölümünün COLDER-WARMER ve cihazin POWER tusuna ayni anda 5 Saniye boyunca basili tutun
Page 30
Icemaker Information
Under Counter (UC-24) Series
6-1
#7003933 - Revision B - November, 2007
ICEMAKER
INFORMATION
Page 31
Icemaker Information
Under Counter (UC-24) Series
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#7003933 - Revision B - November, 2007
MODULAR ICEMAKER
The model UC-24C utilizes a “modular icemaker.” The icemaker operation is not complex, however, an understand­ing of its cycle of operation is necessary in order for a serviceman to make a proper diagnosis.
Modular Icemaker Operation
When the icemaker thermostat has sensed temperatures of 17°F, the thermostat closes. At this time, the current now has a path through the thermostat to the motor. The motor is linked with the drive gear. From the module, there are copper contacts that ride on copper strips on the backside of the drive gear. (See Figure 6-1) As the drive gear rotates, these contacts from the module will make or break a circuit (track) to the copper strips to generate the icemaker cycle.
Figure 6-1. Modular Icemaker Electrical Schematic
Power
(Pink)
Contact C
(Holding Switch)
Contact A
(Water Valve)
Contact B
(Heater / Thermostat)
Contact D
(Timer)
Contact A
Contact B
Contact C
Contact D
TP
V
72
TP
H
Thermostat
M
Water Valve
Ta n
Green
Ω
Htr.
TP
T
TP
4400
Shut-Off
Switch
Ω
Timer
Mtr.
Neutral (White)
TP
NL
On (Dn)
Off (Up)
TP
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Icemaker Information
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Additional Icemaker Operation Notes
NOTES:
• There is no “ICE” key on the control panel of the UC-24C. However, you may see the ICE icon appear during Diagnostic Mode because the LCD is common with other models.
• Power to the icemaker comes direct from L-1, so it is ON 100% of the time, unless the icemaker shut-off arm is tripped to the “up / OFF” position.
• The icemaker shut-off arm must be in the “down / ON” position for the icemaker to operate.
What Happens During Ejector Blade Rotation
Figure 6-2 represents a view of the ejector blade from the front (or module side) of the icemaker. This diagram indi­cates what happens during the rotation of the ejector blade and will assist the Service Technician in diagnosing ice­maker problems
Figure 6-2. Ejector Blade Rotation Diagram
Water Valve Energized
7.5 Seconds
140cc. or 4-3/4oz. Fill
(about 11:00 o'clock)
Thermistor Opens
in This Range of Rotation
Heater Off
6:00 o'clock (reference)
Ejector Blade Stop Position
(about 1:30 o'clock)
Start Position
Thermostat Closes
Motor On, Heater On
Ejector Blade Stalls on Ice
Motor On, Heater On
(1/2 Minute to 5 Minutes
about 4:00 o'clock)
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Icemaker Information
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MODULAR ICEMAKER TEST PROCEDURES
Perform the following tests if the icemaker is thought to be defective. See Figure 6-3 for icemaker test port loca­tions. Test 1 through 5 are performed with power supplied to the icemaker, so read the “WARNING” below and the “additional Ice Production Notes” on the previous page before proceeding.
ELECTRIC SHOCK HAZARD! TESTS 1 THROUGH 5 BELOW ARE PERFORMED WITH POWER SUPPLIED TO THE ICEMAKER. CARE MUST BE TAKEN WHEN PERFORMING THESE TESTS TO AVOID SEVERE PER­SONAL INJURY OR DEATH.
Voltage Tests
1. Check for power between ports “L” and “N”. Make sure test probes go into test ports 1/2”.
2. Strip 1/2” of insulation from each end of a 3” piece of insulated 14 gauge wire to create a jumper/test wire. Insert the stripped ends of this jumper/test wire into ports “T” and “H” to bypass the thermostat.
NOTE: Do not place the jumper/test wire between any other ports as this will damage the icemaker.
If the motor doesn’t run, replace the module/motor assembly.
3. Leave the jumper/test wire in until the ejector blades rotate to approximately 8:00 o’clock. The mold heater should heat up. If not, see test 5 below.
4. Remove the jumper/test wire when the ejector blades reach the 8:00 o’clock position. The water valve should energize for 7.5 seconds when the ejector blades rotate to approximately 11:00 o’clock. If not, repeat test 2 through 4 and check for power to solenoid when ejector blades rotate to approximately 11:00 o’clock. If no volt­age, check electrical connections.
Continuity Tests and Thermostat Inspection
5. With icemaker removed from the unit, check the resistance of the mold heater between ports “L” and “H.” Reading should be between 62 - 82 Ohms. Replace mold/heater assembly if outside this range.
6. With the module/motor separated from the mold/heater assembly, check the resistance of the motor between ports “L” and “M.” Reading should be between 3390 - 4410 Ohms. Replace module/motor assembly if outside this range.
7. If icemaker passes tests 1 through 6, check for adequate supply of Thermal-Mastic on icemaker thermostat. If little or no Thermal-Mastic, apply Thermal-Mastic to thermostat. If adequate sup­ply is present, replace thermostat.
8. See General Troubleshooting Guide if icemaker passes tests 1 through 7.
NOTE: Never attempt to turn the icemaker ejector blades by hand. Doing so will damage the icemaker
Figure 6-3. Icemaker Test Ports
TEST PORTS
H - T = Thermostat
L - H = Heater L - M = Motor L - N = AC Line Voltage
V - N = Valve
N
M
V
L
T
H
Page 34
Icemaker Information
Under Counter (UC-24) Series
6-5
#7003933 - Revision B - November, 2007
WATER FILL ADJUSTMENT
The water valve should energize for approximately 7.5 seconds. This should supply 140cc. of water to the ice­maker, or approximately 4.75 oz. If this is not the case, the fill amount can be adjusted with the water fill adjust­ment screw. (See Figure 6-4)
To increase the fill amount, turn the water fill adjustment screw counterclockwise. To decrease the fill amount, turn the water fill adjustment screw clockwise. A 360° turn will affect the fill by 40cc. A 180° turn will effect the fill by 20cc.
ICEMAKER DISASSEMBLY
Module/Motor Assembly Removal
To remove the module/motor assembly, first remove the cover and the shut-off arm. Then, extract the module/motor assembly mounting screws and pull the module from the support. (See Figure 6-5)
Mold/Heater Assembly Removal
To remove the mold/heater assembly, first remove the cover and the shut-off arm. Insert a Phillips head screwdriver into the access holes and extract the screws. Then, pull the mold/heater assembly from the support. (See Figure 6-5)
Ejector Blades and/or Ice Stripper Removal
To remove the ejector blades and/or ice stripper, first remove the cover and the shut-off arm and disconnect the mold/heater assembly from the support. (See Figure 6-5) Then, pull the ejector blades and/or ice stripper from the mold.
Icemaker Thermostat Removal
To remove the icemaker thermostat, first remove the cover and the shut-off arm and disconnect the mold/heater assembly from the support. (See Figure 6-
5) Then, use a needle-nose pliers to grasp one of the retaining clips and pull out. (See Figure 6-6)
Figure 6-4. Water Fill Adjustment
Figure 6-5. Icemaker Component Removal
Figure 6-6. Thermostat Retaining Clips
Water Fill Adjustment Screw
Modular Assembly
Mounting Screws
Mold Attachment
Screw Access Holes
(2-Phillips Head)
Shut-Off Arm
Retaining
Clips
Thermostat
Page 35
Troubleshooting Guides
Under Counter (UC-24) Series
8-1
#7003933 - Revision B - November, 2007
TROUBLESHOOTING
GUIDES
Page 36
Troubleshooting Guides
Under Counter (UC-24) Series
8-2
#7003933 - Revision B - November, 2007
TROUBLESHOOTING GUIDES
This section of the manual contains:
• The Error Code Table and the Error Code Troubleshooting Guide.
• The General Troubleshooting Guide, which covers all problems that a UC-24 Series unit may experience.
• The Membrane Switch/Ribbon Cable Test Procedures, used to determine if a control panel assembly is defective.
HOW TO USE THE ERROR CODE TROUBLESHOOTING GUIDE
Error Codes indicate problems registered by specific components. If error codes are registered, they will appear before temperature readings while in Diagnostic Mode.
NOTE: If Error Codes appear with a flashing “SERVICE” annunciator prior to initiating Diagnostic Mode, the unit experienced excessive compressor run condition that may or may not be associated with the Error Codes displayed.
To initiate Diagnostic Mode, press and hold either
COLDER key, then press the POWER key, then release both keys. Now, check to see if Error Codes are present, being sure to toggle through all error and temperature readings by pressing either
COLDER key or either WARMER key. (See Error Code Table Below)
If Error Codes appear during Diagnostic Mode, follow the Error Code Troubleshooting Guide on the following page. The left column of the troubleshooting guide lists the error codes. The information in the right column explains what tests to perform and/or what action to take to correct the error.
NOTE: If error codes are observed in diagnostic mode, a non-flashing SERVICE annunciator will appear on the LCD when Diagnostic Mode ends, indicating error codes are still stored. Error Codes must be cleared from the elec­tronic control memory manually. To clear the non-flashing SERVICE annunciator and the error codes, the problem must be corrected and the unit must be ON, then:
On a model UC-24C: Press the Freezer
WARMER and COLDER keys for fifteen (15) seconds.
On a model UC-24B, UC-24R, or UC-24RO: Press the Refrigerator WARMER and COLDER keys for fifteen (15)
seconds.
Error Code Table
CODE INDICATION
05 Refrig. cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s 06 Refrig. evaporator thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s 07 Freezer cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s 08 Freezer evaporator thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s 20 Defrost under-heat with no voltage feedback through Gray/White wire at defrost start 21 Defrost overheat 22 No voltage feedback through Gray/White wire at defrost start 23 Defrost overheat with no voltage feedback through Gray/White wire at defrost start 24 Defrost under-heat 30 NA 40 Excessive Freezer Compressor Run 50 Excessive Refrigerator Compressor Run
Page 37
Troubleshooting Guides
Under Counter (UC-24) Series
8-3
#7003933 - Revision B - November, 2007
EC TEST / ACTION
05
06
07
08
A. If “EE” for refrigerator compartment was displayed and “SERVICE” flashing, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. If “EE” for refrigerator compartment was NOT
displayed, problem is intermittent thermistor error:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check thermistor electrical connections and continuity at J5 on control board. Reconnect / repair.
4. Check resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 05” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “05” Error Code. See Error Code 50 Test/Actions.
A. Initiate Diagnostic Mode. If “EE” is displayed for refrigerator evaporator thermistor, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. Initiate Diagnostic Mode. If “EE” is NOT
displayed for refrigerator evaporator thermistor, problem is intermittent:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check thermistor electrical connections and continuity at J5 on control board. Reconnect / repair.
4. Check resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 06” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “06” Error Code. See Error Code 50 Test/Actions.
A. If “EE” for freezer compartment was displayed and “SERVICE” flashing, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. If “EE” for freezer compartment was NOT
displayed, problem is intermittent thermistor error or caused by over-heat-
ing (above 116°F), check the following:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check for proper mounting and location of freezer compartment thermistor. Remount correctly.
4. Check electrical connections and operation of defrost terminator - Cut-in 30°F (-1°C) /Cut-out 55°F (13°C). Reconnect / repair or replace terminator.
5. Check thermistor electrical connections and continuity at J5 on control board. Reconnect / repair.
6. Check resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 07” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “07” Error Code. See Error Code 40 Test/Actions.
A. Initiate Diagnostic Mode. If “EE” is displayed for freezer evaporator thermistor, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. Initiate Diagnostic Mode. If “EE” is NOT
displayed for freezer evaporator thermistor, problem is intermittent thermis-
tor error or caused by over-heating (above 116°F), check the following:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check for proper mounting and location of freezer evaporator thermistor. Remount correctly.
4. Check electrical connections and operation of defrost terminator - Cut-in 30°F (-1°C) /Cut-out 55°F (13°C). Reconnect / repair or replace terminator.
5. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
6. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 08” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “08” Error Code. See Error Code 40 Test/Actions.
ERROR CODE TROUBLESHOOTING GUIDE
NOTE: Always clear Error Codes after repairs are complete.
Page 38
Troubleshooting Guides
Under Counter (UC-24) Series
8-4
#7003933 - Revision B - November, 2007
EC TEST / ACTION
20
21
22
23
24
A. With cold evap. (< 10°F / -12°C), initiate Manual Defrost, then initiate Diagnostic Mode (press POWER key every
20 seconds to keep in Diagnostic Mode) and observe evap. temp. If temperature exceeds 45°F (7°C) and defrost lasts longer then 5 minutes, error code is false. Clear error code. If error code is not false:
1. Check continuity of Grey/White wire from defrost heater to J2 on control board. Reconnect / repair Grey/White wire.
2. While in defrost, check for AC power at P2 on control board. If no voltage, replace board.
3. Check continuity of Blue wire from defrost terminator to P2 on control board. Reconnect / repair Blue wire.
4. Check resistance of defrost heater (see wire diagram for proper resistance). Replace heater if defective.
5. Check electrical connections and operation of defrost terminator - Cut-in 30°F (-1°C) /Cut-out 55°F (13°C). Reconnect / repair or replace terminator.
6. Reference wiring diagram to identify components in same White wire circuit as defrost heater. Check all White wire electrical connections and continuity from defrost heater to P4 on control board.
A. With cold evap. (< 10°F / -12°C), initiate Manual Defrost, then initiate Diagnostic Mode (press POWER key every
20 seconds to keep in Diagnostic Mode) and observe evap. temp. If temperature does not
exceed 105°F (40.5°C),
error code is false. Clear error code. If error code is not false:
1. Check Blue wire connection at control board (P2). If connected to wrong pin, connect correctly.
2. Check Grey/White wire connection at control board (J2-3). if connected wrong or bad connection, reconnect / repair.
3. Check for proper mounting & location of evap. thermistor, defrost heater & terminator. Remount correctly.
4. Check for electrical short of Blue wire to another circuit. Repair Blue wire &/or electrical connections.
5. Check operation of defrost terminator - Cut-in 30°F (-1°C) /Cut-out 55°F (13°C). Replace if defective.
A. With cold evap. (< 10°F / -12°C), initiate Manual Defrost. If compressor starts 5 minutes after defrost is initiated,
check Grey/White wire and continuity from defrost heater to J2-3 on control board. Reconnect / repair Grey/White wire.
A. With cold evap. (< 10°F / -12°C), initiate Manual Defrost. If compressor starts 5 minutes after defrost is initiated,
check Grey/White wire connections and continuity from defrost heater to J2-3 on control board. Reconnect / repair
Grey/White wire. B. Check for proper mounting and location of evap. thermistor, defrost heater & terminator. Remount correctly. C. Check Blue wire connection at control board (P2). If connected to wrong pin, connect correctly. D Check for electrical short of Blue wire to another circuit. Repair Blue wire &/or electrical connections.
A. With cold evap. (< 10°F / -12°C), initiate Manual Defrost, then initiate Diagnostic Mode (press POWER key every
20 seconds to keep in Diagnostic Mode) and observe evap. temp. If temp. exceeds 45°F, error code is false. Clear
error code. If error code is not false:
1. Check Blue wire connection at control board (P2). If connected to wrong pin, connect correctly.
2. Verify proper location of Grey/White wire at control board (J2-3). if connected wrong or bad connection, recon­nect / repair.
3. Check for proper mounting & location of evap. thermistor, defrost heater & terminator. Remount correctly.
ERROR CODE TROUBLESHOOTING GUIDE
NOTE: Always clear Error Codes after repairs are complete.
Page 39
Troubleshooting Guides
Under Counter (UC-24) Series
8-5
#7003933 - Revision B - November, 2007
EC TEST / ACTION
40
50
A. If Error Code 07, 20, 21, 22, 23, or 24 is also displayed during Diagnostic Mode, see Test/Actions under that code. B. Check for obstructions to freezer door closing. Remove obstruction. C. Check cleanliness of condenser. Clean if needed. D. Check for obstruction to condenser fan blade or loose fan blade. Remove obstruction/Tighten Blade. E. With unit running, check for AC Power from compressor to condenser fan. Repair defective wiring or replace defec-
tive motor.
F. Check resistance of freezer compartment thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective. G. Check evaporator fan blade position and for obstructions. Reposition if incorrect/Remove obstruction. H. With unit running and light switch depressed:
1. Check for AC Power form J3-7 to light switch. Repair wiring/Replace defective switch.
2. Check for AC Power form J3-1 to evaporator fan motor. Repair wiring/Replace defective motor.
3. Check for AC Power form P1 to compressor. Repair wiring if defective.
I. Check sealed system for leaks, restrictions or inefficient compressor.
A. If Error Code 05 is also displayed during Diagnostic Mode, see Test/Actions under that code. B. Check for obstructions to refrigerator door closing. Remove obstruction. C. Check resistance of refrigerator compartment thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defec-
tive.
D. Check refrigerator compartment fan blade position and for obstructions. Reposition if incorrect/Remove obstruction. E. With unit running and light switch depressed:
1. Check for AC Power form J3-5 to evaporator fan motor. Repair wiring/Replace defective motor.
F. Check air baffle control operation. Repair wiring/Replace if defective. G. Check sealed system for leaks, restrictions or inefficient compressor.
ERROR CODE TROUBLESHOOTING GUIDE
NOTE: Always clear Error Codes after repairs are complete.
Page 40
Troubleshooting Guides
Under Counter (UC-24) Series
8-6
#7003933 - Revision B - November, 2007
HOW TO USE THE GENERAL TROUBLESHOOTING GUIDE
• The table on page 8-7 indicate how the General Trouble Shooting Guide is arranged.
• Identify the description of the problem that the unit is experiencing from the table.
• To the left of the problem description is a letter.
• Locate that letter in the left column of the General Troubleshooting Guide.
• The center column will identify the possible causes for the problem.
• The information in the right column explains the tests to perform and/or action to take to correct the problem.
• If the unit is experiencing temperature problems, refer to the instructions below before beginning troubleshooting.
For Temperature Problems
1. Begin troubleshooting by observing compartment set points.
2. If set-points are normal, initiate Diagnostic Mode by pressing and holding either
COLDER key, then press
POWER key, then release both keys.
NOTE: Diagnostic Mode will end twenty (20) seconds after last key stroke.
3. When Diagnostic Mode is initiated, check to see if “Error Codes” are present, being sure to toggle through all error codes and temperature readings by pressing either
COLDER key, or either WARMER key. (See
Thermistor Location Code Tables below.)
4. If Error Codes are present, refer to Error Code Troubleshooting Guide, which starts on page 8-2.
5. If no Error Codes are observed, see General Troubleshooting Guide Table of Contents on following page.
NOTE: If compartment and/or evaporator temperature history is needed to help diagnose problem, initiate Temperature Log Recall Mode. Begin with unit ON and in Diagnostic Mode. While in Diagnostic Mode, toggle
through readings until desired thermistor temperature is displayed on LCD. Now, press POWER key then either WARMER key simultaneously. Toggle through indexes by pressing WARMER or COLDER key.
Models UC-24R, UC-24RO
THERMISTOR LOCATION CODE
Refrigerator Compartment r
Evaporator E
Model UC-24C
THERMISTOR LOCATION CODE
Freezer Compartment F
Refrigerator Compartment r
Evaporator E
Model UC-24B
THERMISTOR LOCATION CODE
Beverage Compartment r
Evaporator E
THERMISTOR LOCATION CODE TABLES
Page 41
Troubleshooting Guides
Under Counter (UC-24) Series
8-7
#7003933 - Revision B - November, 2007
GENERAL TROUBLESHOOTING GUIDE TABLE OF CONTENTS
Page #
A. EE” Displayed in place of Freezer Temperature with “SERVICE” Flashing .................................................... 8-8
B. EE” Displayed in place of Refrigerator Temperature with “SERVICE” Flashing .............................................. 8-8
C. Warm or Normal Temperatures Displayed with “SERVICE” Alone
Flashing .................................................... 8-8
D. Warm or Normal Temperatures Displayed with non-flashing
SERVICE” Displayed ....................................... 8-8
E. Erratic Temperatures with or without
SERVICE” Flashing .............................................................................. 8-8
F. Warm Refrigerator Temperatures, “SERVICE” not displayed or Flashing
...................................................... 8-8
G. Refrigerator Temperatures Too Cold with or without
SERVICE” Flashing (UC-24C ONLY) ........................... 8-8
H. Warm Freezer Temperatures, “SERVICE” not displayed or Flashing
............................................................. 8-10
I. Product Temperature 10° or More Colder than Displayed Temperature ....................................................... 8-12
J. 1. “Extremely” Cold Temperatures Displayed .............................................................................................. 8-12
1° to 7° in Refrigerator
-21° to -15° in Freezer
2. If outside US - “Extremely” Warm Temperatures Displayed
34° to 45° in Refrigerator
-5° to 5° in Freezer
K. No Ice ............................................................................................................................................................. 8-12
L. Icemaker produces Too much ice ................................................................................................................. 8-13
M. Icemaker Produces Hollow Cubes ................................................................................................................. 8-13
N. Icemaker Produces Small Cubes ................................................................................................................... 8-13
O. Water or Clump of Ice in Ice Bucket .............................................................................................................. 8-13
P. No LCD ......................................................................................................................................................... 8-13
Q. No Lights ....................................................................................................................................................... 8-14
R. Lights Stay ON when Door is Closed ............................................................................................................. 8-14
S. Door Not Able to Close Completely ............................................................................................................... 8-14
T. Door Uneven ................................................................................................................................................... 8-14
SEALED SYSTEM DIAGNOSTICS TABLES ................................................................................................. 8-15
Normal Operating Pressures..................................................................................................................... 8-15
Pressure Indications................................................................................................................................... 8-15
Temperature / Pressure Correlation........................................................................................................... 8-16
MEMBRANE SWITCH / RIBBON CABLE TEST ............................................................................................ 8-17
Page 42
Troubleshooting Guides
Under Counter (UC-24) Series
8-8
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
A. “EE” Displayed in place of
Freezer Temperature with “SERVICE” Flashing
B. “EE” Displayed in place of
Refrigerator Temperature with “SERVICE” Flashing
C. Warm or Normal
Temperatures Displayed with “SERVICE” Alone Flashing
D. Warm or Normal
Temperatures Displayed with non-flashing “SERVICE” Displayed
E. Erratic Temperatures with or
without “SERVICE” Flashing
F. Warm Refrigerator
Temperatures, “SERVICE” not
displayed or Flashing
(Continued)
Freezer Compartment Thermistor Disconnected, Shorted, or misread
Refrigerator Compartment Thermistor Disconnected, Shorted, or misread
Excessive Compressor or Evaporator Fan Run
Refrigerator Evaporator Thermistor Disconnected, Shorted, or misread
Error Codes Observed in Diagnostic Mode, but not Cleared from Memory
Control Board Configured for Wrong Model
No Power to Unit
Unit Switched OFF
Unit in Show Room Mode
Control Set Too High
Warm Food Load
High Room Ambient
Door Ajar
a. Food Product Obstruction b. Door Closer Defective
Faulty Light Switch
Check freezer compartment thermistor elec­trical connections from thermistor to control board. Reconnect / repair connections. Check resistance of freezer compartment thermistor for 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
Check refrigerator compartment thermistor electrical connections from thermistor to control board. Reconnect / repair connec­tions. Check resistance of refrigerator com­partment thermistor for 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
Initiate Diagnostic Mode and see Error Code Troubleshooting Guide
Check evaporator thermistor electrical con­nections from thermistor to control board. Reconnect / repair connections. Check resistance of evaporator thermistor for 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
Enter diagnostic mode to observe error codes. See Error Code Troubleshooting Guide. Verify unit was repaired for error codes displayed. Press appropriate WARMER and COLDER keys for 15 sec­onds to clear error codes.
Initiate Manual Model Configuration Mode and reconfigure to correct model.
Check power to unit, plug unit in or switch supply circuit breaker ON.
Check for “OFF” displayed at LCD. If off, press POWER key.
Switch unit to OFF, then press and hold WARMER & COLDER keys, and press POWER key.
Check set-point. If high, adjust.
Check contents of refrigerator for warm food load. Instruct customer.
Instruct customer unit performs best between 60°F(16°C) and 90°F(32°C).
a. Move obstruction. b. Replace door closer.
Check operation of light switch, lights off when switch is depressed. Replace switch if defective.
Page 43
Troubleshooting Guides
Under Counter (UC-24) Series
8-9
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
(Continued)
F. Warm Refrigerator
Temperatures, “SERVICE” not
displayed or Flashing
G. Refrigerator Temperatures
Too Cold with or without “SERVICE” Flashing (Model UC-24C ONLY)
Evaporator Fan Fault
a. Fan blade obstructed or out of position b. Evaporator fan motor disconnected
c. Power to Fan Fault, or Fan Motor
Defective
(NOTE: Compressor must be running)
Compartment Thermistor Misread
Air Baffle Control Fault
(Model UC-24C ONLY)
a. Baffle Control Stuck
b. Baffle Control Disconnected, Defective,
or not Receiving Signal from Control Board.
Evaporator Heavily Frosted
a. Door ajar b. Evaporator fan fault c. Compartment thermistor misread
Power to Compressor Fault
Sealed System Fault
• Sealed System Leak
• Sealed System Restriction
• Inefficient Compressor
See Air Baffle Control Fault above
(Under Problem F)
a. Move obstruction or reposition blade. b. Check electrical connections & continuity
from control board to motor. Reconnect / repair bad connections.
c. With light switch depressed, check for AC
Voltage from control board to fan motor. Replace control board if defective, or Replace motor if defective.
Check resistance of refrigerator compart­ment thermistor for 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
a. Manually open / close air baffle control. If
movement is not smooth, replace baffle con­trol.
b. With light switch depressed, initiate Manual
Compartment Activation Mode for refrigera­tor compartment and observe baffle opera­tion. If baffle does not open within 3 min­utes:
1. Check electrical connections from baffle control to control board. Reconnect / repair bad connections.
2. If electrical connections and wiring are good, and baffle moves freely, replace con­trol board.
a. See Door Ajar above. b. See Evaporator Fan Fault above. c. See Thermistor Misread above
Check for AC Voltage at control board. Replace control board if defective.
See Sealed System Troubleshooting Guide
See Air Baffle Control Fault above (Under Problem F)
Low Voltage Circuit. Do NOT apply Line Voltage
Page 44
Troubleshooting Guides
Under Counter (UC-24) Series
8-10
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
H. Warm Freezer Temperatures,
“SERVICE” not
displayed or
Flashing
No Power to Unit
Unit Switched OFF
Unit in Show Room Mode
Control Set Too High
Warm Food Load
High Room Ambient
Door Ajar
a. Food Product Obstruction b. Door Closer Defective
Condenser Air Flow
a. Dirty condenser b. Condenser fan blade obstructed, loose,
or defective
c. Condenser fan motor disconnected
d. Condenser fan motor defective
Faulty Light Switch
Evaporator Fan Fault
a. Fan blade obstructed or out of position b. Evaporator fan motor disconnected
c. Power to Fan Fault, or Fan Motor
Defective
(NOTE: Compressor must be running)
Compartment Thermistor Misread
Check power to unit, plug unit in or switch supply circuit breaker ON.
Check for “OFF” displayed at LCD. If off, press POWER key.
Press POWER key to OFF, then press and hold WARMER& COLDER keys, and press POWER key.
Check set-point. If high, adjust.
Check contents of freezer for warm food load. Instruct customer.
Instruct customer unit performs best between 60°F(16°C) and 90°F(32°C).
a. Move obstruction. b. Replace door closer.
a. Clean condenser. b. Remove obstruction, or tighten blade, or
replace if defective.
c. Check continuity from motor to compressor.
Reconnect / repair wiring or connections.
d. Check for AC Voltage to motor, replace if
defective.
Check operation of light switch, lights off when switch is depressed. Replace switch if defective.
a. Move obstruction or reposition blade. b. Check electrical connections & continuity
from control board to motor. Reconnect / repair bad connections.
c. With light switch depressed, check for AC
Voltage from control board to fan motor. Replace control board if defective, or Replace motor if defective.
Check resistance of freezer compartment thermistor for 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
Page 45
Troubleshooting Guides
Under Counter (UC-24) Series
8-11
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
(Continued)
H. Warm Freezer Temperatures,
“SERVICE” not
displayed or
Flashing
I. Product Temperature 10° or
More Colder than Displayed Temperature
J. 1. “Extremely” Cold
Temperatures Displayed
1° to 7° in Refrigerator
-21° to -15° in Freezer
2. If outside US ­“Extremely” Warm Temperatures Displayed
34° to 45° in Refrigerator
-5° to 5° in Freezer
Evaporator Heavily Frosted
a. Door ajar b. Evaporator fan fault c. Compartment thermistor misread d. Defrost heater disconnected or faulty
e. Defrost terminator disconnected or
faulty.
f. Defrost sense line disconnected.
g. No power from control board to defrost
circuit
Power to Compressor Fault
Sealed System Fault
• Sealed System Leak
• Sealed System Restriction
• Inefficient Compressor
Compartment Thermistor Misread
1. Control Set to Display Celsius
2. If Outside US - Control Set to Display Fahrenheit
a. See Door Ajar above. b. See Evaporator Fan Fault above. c. See Thermistor Misread above d. Check electrical connections. Reconnect /
repair bad connections. Check resistance of heater, 30-38 Ohms, replace if defective.
e. Check electrical connections, Reconnect /
repair connections or replace bad terminator.
f. Manually initiate defrost - press ICE key for
10 seconds. If defrost lasts exactly 5 min­utes, check all connections of gray/white wire from terminator to control board. Reconnect / repair bad connections.
g. Manually initiate defrost - Press ICE key for
10 seconds. Check for AC Voltage at control board. Replace control board if defective.
Check for AC Voltage at control board. Replace control board if defective.
See Sealed System Troubleshooting Guide
Check resistance of compartment thermistor for 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
1. Change temperature units of measure to Fahrenheit.
2. If Outside US - Change temperature units of measure to Celsius.
Page 46
Troubleshooting Guides
Under Counter (UC-24) Series
8-12
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
K. No Ice No Water Supply to Unit
Unit Has Not Run Long Enough
Warm Freezer Temperatures
(NOTE: Freezer must be 17°F (-8°C) or colder for icemaker to function)
Shut-off Arm Stuck in Up/Off Position
Disconnected or Defective Water Valve
No Power to Icemaker
Frozen Fill Tube - Water Supply Problem
Icemaker System Fault
a. Disconnected or damaged electrical
connections at icemaker or water valve.
b. Defective icemaker
c. Defective icemaker
d. Disconnected or damaged electrical
connections at icemaker
Connect/turn on water supply.
Freezer must be 17°F (-8°C) for icemaker to operate, approximately 24 hours after unit installation. Instruct customer.
See PROBLEM A, C, D, E, & G earlier in Troubleshooting Guide.
Check shut-off arm, if stuck in up/OFF posi­tion, correct problem.
Check electrical connections and water con­nections at water valve, Reconnect / repair connections. Check resistance of water valve, 160 ohms. Replace if defective.
Check for power to icemaker. If no power repair / reconnect wiring.
Check water supply pressure for “constant” 20-100 PSI. If not, instruct customer.
Manually start icemaker with jumper between ports “T” & “H”. Watch cycle of icemaker and see #1, #2 & #3 below.
1. If icemaker motor starts and finishes cycle:
a. Check for 115V at valve during fill mode. If
no 115V, inspect connections at icemaker and valve. Repair or replace connection.
b. Check for 115V from icemaker during fill
mode. If no power, replace icemaker.
2. If icemaker motor starts but does not finish cycle:
c. Replace icemaker.
3. If icemaker motor does NOT start:
d. Check for 115V to icemaker. If no power,
repair electrical connection.
Page 47
Troubleshooting Guides
Under Counter (UC-24) Series
8-13
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
L. Icemaker produces Too
much ice
M. Icemaker Produces Hollow
Cubes
N. Icemaker Produces Small
cubes
O. Water or Clump of Ice in Ice
Bucket
P. No LCD
Ice Level Arm/Linkage Bent or Broken
Icemaker Faulty
Freezer Too Cold, Cycles Icemaker Too Soon
Not Enough Thermal-Mastic on Icemaker Thermostat
Icemaker Thermostat Fault
Water Supply Problem
Icemaker Not Level
Low Fill Adjustment on Icemaker
Icemaker Not Level
High Fill Adjustment on Icemaker
Water Valve Energized Too Long
Intermittent Warm Freezer Temperatures
Unit in Sabbath Mode
Display Wire Harness Disconnected or Faulty
Control Panel Assembly Defective (OR) No Signal Read at Control Board
Inspect ice level / shut-off arm. Replace defective parts.
With ice level arm in UP/OFF position, manually start icemaker with jumper between ports “T” & “H”. If icemaker motor starts with arm in the UP/OFF position, replace icemaker.
See PROBLEM “H” earlier in Troubleshooting Guide.
Inspect icemaker thermostat, apply more Thermal-Mastic to thermostat.
Replace Thermostat.
Check water supply pressure; must be con­stant 20-100 PSI. If not, instruct customer.
Check level of icemaker, adjust if needed
Check for 100-110 cc. fill (3.5-3.75 oz.). If low, increase fill by turning adjusting screw counterclockwise.
Check level of icemaker, level if needed.
Check for 100-110 cc. fill (3.5-3.75 oz.). Turn adjusting screw clockwise to decrease.
• Check icemaker for jammed ice cube, clear jam if present.
• Check icemaker levelness; level if needed.
• Check position of fill cup. Reposition if in ice path.
• Check water supply pressure; must be con­stant 20-100 PSI. If not, instruct customer.
• Check water valve operation, opens when AC Voltage is applied, closes completely when AC Voltage is removed. Water valve Ohms = 160. Replace if defective.
See PROBLEM A, C, D, E, & H earlier in Troubleshooting Guide.
Exit Sabbath Mode.
Check display wire harness and connec­tions. Reconnect, repair, replace bad wiring.
See Membrane Switch/Ribbon Cable Test Procedures. If membrane switch fails any test, replace entire control panel assembly. If switch passes all tests, replace control board.
Page 48
Troubleshooting Guides
Under Counter (UC-24) Series
8-14
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
Q. No Lights
R. Lights Stay ON when Door is
Closed
S. Door Not Able to Close
Completely
T. Door Uneven
No power to unit
Unit switched OFF
Unit in Sabbath Mode
Defective or loose light bulb(s)
Light Switch Disconnected or Defective
Lighting System Wiring Disconnected or Defective
No Power From Control Board
(NOTE: See Unit in Sabbath Mode above.)
Accent Lights Switched ON (Model UC-24B ONLY)
Door Ajar
a. Food product obstruction b. Door Closer Defective
Faulty Light Switch
Food Product Obstruction
Door Closer Defective
Unit Not Level
Check power to unit, plug unit in or switch supply circuit breaker ON.
Switch unit ON, press POWER key.
Exit Sabbath Mode.
Install a known good light bulb.
Check wire connections at light switch. Reconnect/repair. Check for AC Voltage to and from light switch. Replace switch if defective.
Check continuity from light sockets to switch. Reconnect/repair or replace defec­tive components.
Check for AC Voltage from control board. Replace board if defective. (NOTE: See Unit in Sabbath Mode above.)
Switch Accent Lights OFF
a. Move obstruction. b. Replace door closer.
Check operation of light switch, lights off when switch is depressed. Replace switch if defective.
Move obstruction.
Replace door closer.
Check levelness of unit. If un-level, turn lev­eling legs counterclockwise to raise unit or clockwise to lower it.
Page 49
Troubleshooting Guides
Under Counter (UC-24) Series
8-15
#7003933 - Revision B - November, 2007
UC-24C
5” Vac - 1 psi to 6 - 12 psi 75 psi to 120 psi
UC-24R / UC-24RO
0 - 12 psi to 30 - 42 psi 75 psi to 110 psi
SEALED SYSTEM DIAGNOSTICS TABLES
NORMAL OPERATING PRESSURES TABLE NOTES:
• Only enter the sealed system to check pressures if the Error Code Troubleshooting Guide and General Troubleshooting Guide could not pinpoint the cause of the temperature problem.
• Always use solder-on process valves when entering the sealed system. Do NOT use bolt-on process valves as they are prone to leak.
• Whenever servicing the sealed system, the high-side filter-drier MUST be replaced.
• Pressures listed below are not indicative of initial pull down, but rather of a steadily running and properly function­ing appliance.
• Pressures listed are for reference only, as actual pressure readings may vary because of one or more of the fol­lowing reasons:
1. Ambient temperatures (Pressures are based on a 70°F (21°C) Ambient).
2. Temperature set-points (Pressures listed below are based on set-points of 0°F (-18°C) in freezers and 38°F
(3°C) in refrigerators)
3. Food load quantity and temperature.
4. Condenser cleanliness.
5. Whether or not one or both refrigeration systems are operating.
6. Gauge calibration.
NORMAL OPERATING PRESSURES
Model Normal Low-Side Pressures Normal High-Side Pressures
UC-24B
0 - 12 psi to 30 - 42 psi 75 psi to 110 psi
PRESSURE INDICATIONS
If low-side pressure is
NORMAL
LOW
LOW
HIGH
HIGH
& high-side pressure is
NORMAL
LOW
HIGH
LOW
HIGH
possible problem is
MECHANICAL
(see General Troubleshooting Guide)
LEAK
RESTRICTION
INEFFICIENT COMPRESSOR
OVER CHARGE
Page 50
Troubleshooting Guides
Under Counter (UC-24) Series
8-16
#7003933 - Revision B - November, 2007
EVAPORATOR TEMPERATURE / SEALED SYSTEM LOW-SIDE PRESSURE CORRELATION
Pressure
10” Vac
7” Vac 4” Vac 0” Vac
2 Psi 4 Psi 7 Psi
9 Psi 12 Psi 15 Psi 18 Psi 22 Psi 26 Psi 30 Psi 35 Psi 40 Psi 45 Psi 51 Psi 57 Psi 64 Psi 71 Psi 78 Psi
NOTE: The temperature/pressure table at right is for refer­ence only. A unit's temperature/pressure correlation may differ from those listed due to: variations in evaporator ther­mistor location, set-points, where the sealed system is in the refrigeration cycle, ambient temperature, etc. If a unit is experiencing temperature problems, it is recom­mended that you reference the General Troubleshooting Guide before accessing the sealed system. After all mechanical and electrical components have been ruled out, sealed system pressures can be checked by applying solder-on process valves and referencing the preceding page. Do NOT
use bolt-on process valves as they are prone to leak. This table should only be used as a last quick check before entering the sealed system.
Temperature
-30°F (-34°C)
-25°F (-32°C)
-20°F (-29°C)
-15°F (-26°C)
-10°F (-23°C)
-5°F (-21°C) 0°F (-18°C) 5°F (-15°C)
10°F (-12°C)
15°F (-9°C) 20°F (-7°C) 25°F (-4°C) 30°F (-1°C)
35°F (2°C) 40°F (4°C)
45°F (7°C) 50°F (10°C) 55°F (13°C) 60°F (16°C) 65°F (18°C) 70°F (21°C) 75°F (24°C)
Page 51
Troubleshooting Guides
Under Counter (UC-24) Series
8-17
#7003933 - Revision B - November, 2007
Ribbon Cable Terminal Housing
NOTE: See “How To Identify Pin 1”, above.
Control Panel Assembly
Figure 9-2. UC-24C Control Panel Assembly
FREEZER
COLDER
KEY
REFRIG
COLDER
KEY
REFRIG
WARMER
KEY
FREEZER
WARMER
KEY
POWER
KEY
MODEL
NA 1 - 34 - 5NA3 - 4UC-24B
1 - 5 1 - 34 - 51 - 23 - 4UC-24C
NA 1 - 34 - 5NA3 - 4UC-24R
NA 1 - 34 - 5NA3 - 4UC-24RO
CONTROL PANEL MEMBRANE SWITCH / RIBBON CABLE TEST
If integrity of control panel assembly is suspect, perform continuity tests at membrane switch ribbon cable terminal housing. Begin by removing control panel assembly from unit and place it on solid surface, then disconnecting rib­bon cable from control panel PC board.
Pin 1 Identification Procedure
The ribbon cable wires are exposed at the back-side of the terminal housing. Place ohm meter leads between 1st and 2nd pin from each end of the housing while pushing the Freezer
WARMER key of a Model UC-24C, or the Refrigerator WARMER key of a Model UC-24B, UC-24R, or UC-24RO. When continuity is observed, pin 1 is at that end of the terminal housing.
Continuity Test Procedure
1. Without pressing any of the keys on the membrane switch, check for continuity across all pin combinations. With
no keys pressed, there should be no continuity between any two pins.
2. Identify model number being serviced in left column of table below.
3. Press key listed at top of table.
4. Corresponding numbers to right of model number and below key being pressed are the pin numbers on terminal
housing that should have continuity.
NOTE: If any continuity tests show failure, replace entire control panel assembly.
Page 52
Technical Data
Under Counter (UC-24) Series
9-1
#7003933 - Revision B - November, 2007
TECHNICAL DATA
Page 53
Technical Data
Under Counter (UC-24) Series
9-2
#7003933 - Revision B - November, 2007
Model UC-24B
REFRIGERATOR
CHARGE (R-134a Refrigerant)
NOTE: Always check serial tag for exact charge
NORMAL OPERATING PRESSURES
Low Side
High Side
COMPRESSOR
NOTE: Always check parts price list for possible substitutions.
Service Part No.
Manufacturer
Manufacturer Model Number
Original/Service Compressor Amps
Original/Service Compressor BTU/H
DEFROST METHOD
THERMISTORS
Resistance/Ohms at 32°F / 0°C
3.75 oz. (0.11 Kg)
0 - 12 psi to 30 - 42 psi
75 psi to 110 psi
7002177
Embraco
EMU45HSC
~1.5 / ~1.5
450 / 450
“Fan Assisted Off-Cycle Defrost”
Evap > 38°F (3°C) before
Compressor ON.
30000 - 33000
Page 54
Technical Data
Under Counter (UC-24) Series
9-3
#7003933 - Revision B - November, 2007
Model UC-24C
FREEZER
CHARGE (R-134a Refrigerant)
NOTE: Always check serial tag for exact charge
NORMAL OPERATING PRESSURES
Low Side
High Side
COMPRESSOR
NOTE: Always check parts price list for possible substitutions.
Service Part No.
Manufacturer
Manufacturer Model Number
Original/Service Compressor Amps
Original/Service Compressor BTU/H
DEFROST METHOD
DEFROST TERMINATOR
Cut-In Temp.
Cut-Out Temp.
DEFROST HEATER
Watts Amps
Resistance/Ohms
WATER VALVE
Watts Amps
Resistance/Ohms (Inductive)
THERMISTORS
Resistance/Ohms at 32°F / 0°C
4.5 oz. (0.13 Kg)
5” Vac - 1 psi to 6 - 12 psi
75 psi to 120 psi
7002177
Embraco
EMU45HSC
~1.5 / ~1.5
450 / 450
“Adaptive Defrost”
Defrost intervals and duration vary by unit use. 5 minute com­pressor delay after each defrost.
30°F (-1°C)
55°F ( 13°C)
240
1.9 - 2.3 50 - 61
50
0.42 160
30000 - 33000
Never replace the defrost terminator with another hav­ing a cut-out limit above 55°F (13°C), as this will dam­age the appliance.
Page 55
Technical Data
Under Counter (UC-24) Series
9-4
#7003933 - Revision B - November, 2007
Model UC-24R / UC-24RO
REFRIGERATOR
CHARGE (R-134a Refrigerant)
NOTE: Always check serial tag for exact charge
NORMAL OPERATING PRESSURES
Low Side
High Side
COMPRESSOR
NOTE: Always check parts price list for possible substitutions.
Service Part No.
Manufacturer
Manufacturer Model Number
Original/Service Compressor Amps
Original/Service Compressor BTU/H
DEFROST METHOD
THERMISTORS
Resistance/Ohms at 32°F / 0°C
3.75 oz. (0.11 Kg)
0 - 12 psi to 30 - 42 psi
75 psi to 110 psi
7002177
Embraco
EMU45HSC
~1.5 / ~1.5
450 / 450
“Fan Assisted Off-Cycle Defrost”
Evap > 38°F (3°C) before
Compressor ON.
30000 - 33000
Page 56
Wire Diagrams & Schematics
Under Counter (UC-24) Series
10-1
#7003933 - Revision B - November, 2007
WIRING DIAGRAMS
AND SCHEMATICS
Page 57
J5-5,6
P2
P1
J6-2
SERIAL DATE TRANSMIT
SENSES EVAPORATOR TEMPERATURE
NOT USED
REF DOOR LIGHT SENSE
NOT USED
NEUTRAL
DEFROST HEATER
L1
L2
FREEZER COMPARTMENT
DEFROST SENSOR
DISPLAY WIRING
BAFFLE CLOSE
C
O
GRAY/WHITE
EVAP
DISPLAY
DISPLAY
DISPLAY
DISPLAY
LIGHTS
FAN 1
COMPRESSOR
LOW VOLTAGE THERMISTOR CIRCUITS
120 VOLT CIRCUITS
J3-3
P3
P4
J3-1
J3-2
J3-6
J3-5
J3-4
J2-1
J3-7
J5-1,2
J2-4
J2-3
J2-2
J4-5
J5-3,4
J5-7
J6-1
J5-8
J4-2
J4-1
J6-3
J4-4
J4-3
J4-6
12VDC POWER SUPPLY FOR DISPLAY BOARD
GROUND FOR DISPLAY BOARD POWER SUPPLY
SERIAL DATA RECEIVE
SENSES EVAPORATOR TEMPERATURE
SENSES IF LOWER DOOR OPEN
POWERS COMPRESSOR AND CONDENSER FAN
POWERS EVAPORATOR FAN
POWER INTO BOARD
NEUTRAL INTO BOARD
NOT USED
NOT USED
NOT USED
EVAPORATOR FAN
COMPRESSOR
POWER IN
LIGHTS
NOT USED
NOT USED
POWERS LIGHTS
REF COMPARTMENT
DISPLAY WIRING
EVAPORATOR
DISPLAY WIRING
DISPLAY WIRING
EVAPORATOR
BAFFLE OPEN
BAFFLE NEUTRAL
WHITE
PURPLE
BLACK
RED
YELLOW
ORANGE
ORANGE
BLUE/RED
WHITE
YELLOW
ORANGE/RED
RED
SENSES REF CABINET TEMPERATURE
CAB
BLUE/BLACK
N
BAFFLE NEUTRAL
YELLOW/RED
PULSED TO CLOSE NEUTRAL
YELLOW/BLACK
YELLOW/WHITE
PULSED TO OPEN NEUTRAL
DEFROST
ICE
FAN 1
R DOOR
DEF
ICE
POWERS DEFROST CIRCUIT
BLUE
SENSES WHEN DEFROST HEATER SHUTS OFF
CAB SENSES FREEZER CABINET TEMP
BLUE/WHITE
CIRCUIT
TERMINAL
MAIN CONTROL BOARD SUMMARY
DESCRIPTION
FUNCTION COLOR
-This wiring information is provided for use by qualified service personnel only.
-Disconnect appliance from electrical supply before beginning service.
-Be sure all grounding devices are connected when service is complete.
-Failure to observe the above warnings may result in severe electrical shock.
2
1
2
1
ORANGE YELLOW
PIN 1
PIN 1
2 3 4
RED WHITE
1
2
4
1
J3
J2
ORANGE
YELLOW
YELLOW
ORANGE
1 2
WHITE
PLAIN
GREEN
RIBBED
1 BLACK
2 WHITE
L1
L2
1 PURPLE
2 WHITE
3 GRN/YL STP
2 BROWN
1 BLUE
WHITE
WHITE
PURPLE
WHITE
GREEN
BLACK
BLACK
BLACK
WHITE
GREEN W/YELLOW STRIPE
PURPLE
TAN
WHITE
GREEN/YELLOW STRIPE
YELLOW/RED STRIPE YELLOW/BLACK STRIPE YELLOW/WHITE STRIPE
1
1
1
1
J4
J5
J6
J2
P1
J3
P2
P4
P3
1
MAIN BOARD
BLACK
PURPLE
YELLOW
RED
WHITE
9
YELLOW/BLACK
ORANGE
RED
WHITE
YELLOW
ORANGE
ORANGE/BLACK STRIPE
RED
WHITE 11
3
YELLOW 4
BLUE/BLACK STRIPE
BLUE/BLACK STRIPE
3
2
1
ORANGE
RED
ORANGE
BLUE/RED STRIPE
ORNG/RED STRIPE
3
6
6
5
ORANGE
14110
18
17
WHITE
RED
BLACK
ORANGE
YELLOW 8
YELLOW/WHITE STRIPE YELLOW/BLACK STRIPE YELLOW/RED STRIPE
PINK
4
WHITE
TAN
GRN/YLW
1
2
3
2
1
4
5
BLUE
GRAY/WHITE 13
2
GRAY/WHITE
BLUE/WHITE STRIPE
BLUE/WHITE STRIPE
YELLOW/WHITE 7
6
YELLOW/RED 5
WHITE
WHITE
RED
WHITE
RED
SENSOR
UPPER
REF LIGHT
MOTOR
REF FAN
(REF CAB)
SENSOR
(EVAP)
THERMAL
FUSE
ICEMAKER
DEFROST HEATER
BLACK
BLACK
GRAY/WHITE STRIPE
GRAY/WHITE STRIPE
BLUE
DEFROST TERMINATOR
GRAY
BLUE
(FZ CAB)
SENSOR
J5
J4
J6
J3
J2
JACKET CABLE (MARKED WITH GREEN STRIPE)
JACKET CABLE (MARKED WITH 2 GREEN STRIPES)
JACKET CABLE (MARKED WITH 2 BLUE STRIPES)
MFG TEST TERMINALS
COMPRESSOR
CORD
SUPPLY
POWER
CONDENSER FAN MOTOR
PIN 1
PIN 1
PIN 1
PIN 1
MAIN CONTROL BOARD DETAIL
PIN 1
SWITCH LIGHT
DISPLAY BOARD
REF AIR DUCT
BAFFLE
SOLENOID
ICEMAKER
(OPTIONAL)
P2
P1
P4
P3
WIRING DIAGRAM MODEL UC-24C
P/N 7002956 REV A
PURPLE
Wire Diagrams & Schematics
Under Counter (UC-24) Series
10-2
#7003933 - Revision B - November, 2007
Page 58
Wire Diagrams & Schematics
Under Counter (UC-24) Series
10-3
#7003933 - Revision B - November, 2007
P/N 7002956 REV A
WIRING SCHEMATIC MODEL UC-24C
-This wiring information is provided for use by qualified service personnel only.
-Disconnect appliance from electrical supply before beginning service.
-Be sure all grounding devices are connected when service is complete.
-Failure to observe the above warnings may result in severe electrical shock.
LOW VOLTAGE SCHEMATIC
PIN 1
THERMISTOR CABINET/FREEZER
HIGH VOLTAGE SCHEMATIC
ORANGE
MEMBRANE KEYPAD
DISPLAY
DISPLAY BOARD
THERMISTOR CABINET/REF
GRAY/WHITE
REF AIR DUCT BAFFLE
THERMISTOR
EVAPORATOR
115 VOLTS 60 CYCLES
L1
NEUTRAL
PIN 1
YELLOW W/WHITE STRIPE
YELLOW W/BLACK STRIPE
YELLOW W/RED STRIPE
J2
PIN 1
P4
P3
MAIN BOARD
J2
ORANGE
YELLOW
J3
BLUE W/RED STRIPE
ORANGE W/RED STRIPE
BLUE W/WHITE STRIPE BLUE W/WHITE STRIPE
BLUE W/BLACK STRIPE BLUE W/BLACK STRIPE
WHITE
WHITE
RED
J6
J5
PIN 1
J4
PIN 1
PIN 1
WHITE
P1
P2
PIN 1
J3
J6
J4
J5
J2
PIN 1
MAIN BOARD
PIN 1
PIN 1
PIN 1
ORANGE
PIN 1
WHITE
P4
BLACK
P3
PURPLE
P1
BLUE
P2
J3
YELLOW
ORANGE
REF LIGHT SWITCH
BLACK
RED
THERMAL
FUSE
GRAY/WHITE
ICEMAKER
OVERLOAD
PROTECTOR
CONDENSER FAN
DEFROST HEATER
R55 OHMS
REF (TOP) LIGHT
WHITE
TAN
COMPRESSOR
M
M
REF FAN MOTOR
M
ICEMAKER
VALV E
R160 OHMS
RUNNING
CAPACITOR
COMPRESSOR STARTING RELAY
WHITE
(WHEN USED)
WHITE
WHITE
WHITE
WHITE
WHITE
Page 59
WHITE
PURPLE
BLACK
RED
YELLOW
ORANGE
ORANGE
BLUE/RED
WHITE
YELLOW
ORANGE/RED
RED
BLUE/BLACK
12VDC POWER SUPPLY FOR DISPLAY BOARD
GROUND FOR DISPLAY BOARD POWER SUPPLY
SERIAL DATE TRANSMIT
SERIAL DATA RECEIVE
SENSES EVAPORATOR TEMPERATURE
SENSES IF LOWER DOOR OPEN
POWERS COMPRESSOR AND CONDENSER FAN
SENSES EVAPORATOR TEMPERATURE
POWERS EVAPORATOR FAN
POWER INTO BOARD
NEUTRAL INTO BOARD
POWERS LIGHTS
SENSES REFER CABINET TEMPERATURE
NOT USED
NOT USED
REF DOOR LIGHT SENSE
NOT USED
NOT USED
NEUTRAL
NOT USED
EVAPORATOR FAN
NOT USED
COMPRESSOR
POWER IN
LIGHTS
NOT USED
NOT USED
NOT USED
NOT USED
REFRIGERATOR
COMPARTMENT
DISPLAY WIRING
EVAPORATOR
DISPLAY WIRING
DISPLAY WIRING
DISPLAY WIRING
EVAPORATOR
NOT USED
NOT USED
NOT USED
EVAP
EVAP
DISPLAY
DISPLAY
DISPLAY
DISPLAY
LIGHTS
FAN 1
COMPRESSOR
L1
L2
CAB
N
C
O
DEFROST
ICE
FAN 1
R DOOR
DEF
ICE
LOW VOLTAGE THERMISTOR CIRCUITS
J5-5,6
J3-3
P3P4P2
P1
J3-1
J3-2
J3-6
J3-5
J3-4
J2-1
J3-7
J5-1,2
J2-4
J2-3
J2-2
J4-5
J5-3,4
J5-7
J6-2
J6-1
J5-8
J4-2
J4-1
J6-3
J4-4
J4-3
J4-6
120 VOLT CIRCUITS
CIRCUITTERMINAL
MAIN CONTROL BOARD SUMMARY
DESCRIPTION FUNCTION COLOR
-This wiring information is provided for use by qualified
service personnel only.
-Disconnect appliance from electrical supply before beginning service.
-Be sure all grounding devices are connected when service is complete.
-Failure to observe the above warnings may result in severe electrical shock.
PIN 1
PIN 1
PIN 1
PIN 1
PIN 1
J5
J4
J6
J3
P2
P1
J2
P4
P3
YELLOW
ORANGE
WHITE
BLACK
1 PURPLE
2 WHITE
3 GRN/YL STP
2 BROWN
1 BLUE
2
1
GREEN
BLACK
BLACK
PLAIN
2 WHITE
GREEN
RIBBED
1 BLACK
WHITE
WHITE
L1
L2
PURPLE
J4
J5
J6
J2
J3
PURPLE
WHITE
GREEN W/YELLOW STRIPE
2
321
WHITE 11
6
P1
P2
P4
P3
1
1
1
1
1
ORANGE
RED
ORANGE
3
YELLOW 4
BLUE/BLACK STRIPE
BLUE/RED STRIPE
ORNG/RED STRIPE
5
14
1109
18
17
ORANGE
8
PIN 1
3 4
RED
1
J3
J2
MAIN BOARD
WHITE
BLACK
PURPLE
YELLOW
RED
ORANGE
WHITE
YELLOW
ORANGE/BLACK STRIPE
RED
BLUE/BLACK STRIPE
YELLOW
6
ORANGE
WHITE
RED
BLACK
YELLOW
ORANGE YELLOW
PIN 1
WHITE
2
JACKET CABLE (MARKED WITH BLUE STRIPE)
SENSOR
3
(REF CAB)
1
ORANGE
RED
PINK BLACK
(BEVERAGE CENTER ONLY)
UPPER REFRIGERATOR
LIGHT
WHITE
REF FAN MOTOR
RED
WHITE
WHITE
ORANGE
RED
SENSOR (EVAP)
PINK
SWITCH LIGHT
WHITE
CORD
SUPPLY
JACKET CABLE (MARKED WITH 2 RED STRIPES)
(BEVERAGE CENTER ONLY)
MFG TEST TERMINALS
COMPRESSOR
POWER
CONDENSER FAN MOTOR
WIRING DIAGRAM MODEL UC-24B, UC-24R, UC-24RO
MAIN CONTROL BOARD DETAIL
SWITCH LIGHT
P/N 7002555 REV A
LIGHT TUBE
DISPLAY BOARD
PURPLE
Wire Diagrams & Schematics
Under Counter (UC-24) Series
10-4
#7003933 - Revision B - November, 2007
Page 60
-This wiring information is provided for use by qualified
service personnel only.
-Disconnect appliance from electrical supply before beginning service.
-Be sure all grounding devices are connected when service is complete.
-Failure to observe the above warnings may result in severe electrical shock.
PIN 1
RELAY
YELLOW
STARTING
RED
ORANGE
(WHEN
USED)
CAPACITOR
COMPRESSOR
REF LIGHT
SWITCH
WHITE
BLACK
PROTECTOR
PIN 1
THERMISTOR REFRIGERATOR
BLUE W/BLACK STRIPE
WHITE
ORANGE W/RED STRIPE
J5
J3
J2
J4
J6
J3
P2
P1
P3
P4
M
M
M
ORANGE
PURPLE
ORANGE
PIN 1
PIN 1
PIN 1
YELLOW
MAIN BOARD
PIN 1
ORANGE
PIN 1
WHITE
REF (TOP)
LIGHT
REF FAN MOTOR
OVERLOAD
CONDENSER FAN
RED
COMPRESSOR
RUNNING
MAIN BOARD
WHITE
MEMBRANE KEYPAD
THERMISTOR EVAPORATOR
NEUTRAL
HIGH VOLTAGE SCHEMATIC
L1
115 VOLTS 60 CYCLES
DISPLAY BOARD
BLUE W/BLACK STRIPE
PIN 1
BLUE W/RED STRIPE
PIN 1
PIN 1
PIN 1
LOW VOLTAGE SCHEMATIC
PIN 1
LIGHTS
PINK
WHITE
REF LIGHT
SWITCH
LIGHT TUBE SWITCH
(UC-24B ONLY)
J4
J5
J3
J6
J2
P3
P2
P1
P4
DISPLAY
J2
P/N 7002555 REV A
WIRING SCHEMATIC MODEL UC24-B, UC-24R, UC-24RO
Wire Diagrams & Schematics
Under Counter (UC-24) Series
10-5
#7003933 - Revision B - November, 2007
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