Sub-zero Uc-24 series User manual

Under Counter (UC-24) Series

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Electronic Control System

Under Counter (UC-24) Series

3-1 #7003933 - Revision B - November, 2007

ELECTRONIC CONTROL

SYSTEM INFORMATION

Electronic Control System

Under Counter (UC-24) Series

3-3 #7003933 - Revision B - November, 2007

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

THERMISTOR CABINET/REF

DISPLAY BOARD

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

FUSE

THERMAL

BLACK

R160 OHMS

YELLOW W/WHITE STRIPE

YELLOW W/BLACK STRIPE

YELLOW W/RED STRIPE

GRAY/WHITE

WHITE

ORANGE

PIN 1

MAIN BOARD

PIN 1

WHITE

REF (TOP) LIGHT

PROTECTOR COMPRESSOR

MAIN BOARD

MEMBRANE KEYPAD

NEUTRAL

60 CYCLES

HIGH VOLTAGE SCHEMATIC 115 VOLTS

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.

Electronic Control System Under Counter (UC-24) Series

3-4

#7003933 - Revision B - November, 2007

P2 P1 P3 P4

PIN 1 PIN 1

PIN 1

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.

LOW VOLTAGE THERMISTOR CIRCUITS

120 VOLT CIRCUITS

MAIN CONTROL BOARD SUMMARY

J3-3

J3-1

J3-2

J3-6

J3-4

J5-5,6

J3-5

J2-1

J3-7

J2-4

J2-3

J2-2

J5-1,2

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

TERMINAL

EVAP

DISPLAY

LIGHTS

FAN 1

COMPRESSOR

CAB

DEFROST

ICE

FAN 2

R DOOR

DEF

ICE

CAB

CIRCUIT

NOT USED

REF DOOR LIGHT SENSE

NOT USED

NEUTRAL

NOT USED

EVAPORATOR FAN

DEFROST HEATER

COMPRESSOR

POWER IN

LIGHTS

FREEZER COMPARTMENT

DEFROST SENSOR

NOT USED

REF COMPARTMENT

DISPLAY WIRING

EVAPORATOR

DISPLAY WIRING

EVAPORATOR

BAFFLE CLOSE

BAFFLE OPEN

BAFFLE NEUTRAL

DESCRIPTION

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 REF CABINET TEMPERATURE

BAFFLE NEUTRAL

PULSED TO CLOSE NEUTRAL

PULSED TO OPEN NEUTRAL

POWERS DEFROST CIRCUIT

SENSES WHEN DEFROST HEATER SHUTS OFF

SENSES FREEZER CABINET TEMP

FUNCTION

WHITE

PURPLE

COLOR

BLACK

RED

YELLOW

ORANGE

BLUE/RED

WHITE

YELLOW

ORANGE/RED

RED

BLUE/BLACK

YELLOW/RED

YELLOW/BLACK

YELLOW/WHITE

BLUE

GRAY/WHITE

BLUE/WHITE

Electronic Control System

Under Counter (UC-24) Series

3-5 #7003933 - Revision B - November, 2007

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.

Figure 3-4. UC-24C Kumanda Paneli Görünümü

FREEZER AYAR

TUSLARI

FRESH FOOD AYAR

TUSLARI

LCD

(GÖRÜNTÜ PANELi)

AÇ/KAPA

TUSU

Figure 3-5. UC-24B, UC-24R, UC-24RO Kumanda Paneli Görünümü

FRESH FOOD AYAR

TUSLARI

LCD

(GÖRÜNTÜ PANELi)

AÇ/KAPA

TUSU

Electronic Control System Under Counter (UC-24) Series

3-6

#7003933 - Revision B - November, 2007

Sekil 3-6. Cihazin çalistirilmasi ve durdurulmasi için POWER tusu kullanilir.

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 refriger-

ator 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 3-7. Ayar yapmak için WARMER ya da COLDER tuslarini kullaniniz.

Electronic Control System

Under Counter (UC-24) Series

3-7 #7003933 - Revision B - November, 2007

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

Electronic Control System Under Counter (UC-24) Series

3-8

#7003933 - Revision B - November, 2007

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 actu-

ally 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 indicat-

ing 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

Electronic Control System

Under Counter (UC-24) Series

3-9 #7003933 - Revision B - November, 2007

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

Electronic Control System Under Counter (UC-24) Series

3-10

#7003933 - Revision B - November, 2007

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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