Subzero IC-24CI User manual

Controls & Operation 3
subzero.com 800.222.7820
IC-24CI
Service Manual

Page 2
USER INTERFACE MODULE (UIM)
Perform input operations, including temperature regulation, user
options, and settings; view possible issues; and enter service
functions for the electronic control system through the User
Interface Module (UIM).
BOOT-UP SCREEN
The Boot-Up screen appears after supplying power to the unit
for the first time.
Loading, Please Wait...
0000000000
POWER SCREEN
The Power screen appears after initial boot-up. To switch the
unit on, tap Power on the screen. To turn off, tap Power.
Power
HOME SCREEN
The Home screen appears after the unit is powered on. Current
temperatures appear on the display. After opening the upper
section, the Option screen appears for three seconds, then the
Home screen appears.
power
° °
70
70
° °
21
21
TEMPERATURE SET-POINT ADJUSTMENT
Touch a temperature reading on the Home screen to access the
temperature set-point adjustment screen. Once the temperature
flashes, touch the + or - icon to adjust the temperature. The
freezer temperature range is -5°F to 5°F. The refrigerator
temperature range is 34°F to 45°F. After adjustment, touch the
temperature again or wait 10 seconds to return to the home
screen.
°
37
+-
OPTION SCREEN
To access the Option screen, touch the arrow icon on the Home
screen. The Option screen also appears for three seconds if the
upper section is opened while the unit is running. On the Option
screen, a dark icon means the feature is active. Touch the
desired icon to activate, deactivate, or access a feature.
select option
TIP: Option screen icons will vary depending on model.
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Icon Description
Touch to activate or deactivate ice maker and max ice
feature. One cube indicates regular ice; three cubes
indicates max ice mode.
Touch to activate or deactivate door/drawer alarm.
Icon appears on the Home screen when the door
alarm is active.
Touch to activate or deactivate water dispenser.
Touch to activate or deactivate air purification system.
Icon appears on the Home screen when the air
purification system is active.
Touch to view Settings screen.
Touch an arrow to return to the Home screen.
SETTINGS SCREEN
Use the Settings screen to adjust product settings. The
Settings screen scrolls in a horizontal loop.
Settings
SETTINGS SCREEN ICONS
Icon Description
Touch to adjust lighting delay and intensity.
Touch to select smart home options.
Touch to set clock.
Touch to select language options.
TIP: Available languages are English, Spanish, French,
German, and Italian.
Touch to view model information.
Touch to select temperature unit, Fahrenheit or
Celsius.
Touch to adjust control panel brightness and contrast.
Touch to adjust door/drawer alarm volume and pitch.
Touch to adjust door/drawer alarm duration.
Touch to enter Sabbath mode.
Touch to view troubleshooting and service
information.
LIGHTING ADJUSTMENT SCREEN
1Tap Settings .
2Tap Soft On Lighting .
3The screen for adjusting the lighting delay and intensity
appears.
Soft On
Dimming Accent
1S
2S
4S
L
M
H
4Slide the Dimming bar to select the desired delay period.
5Slide the Accent bar to the desired intensity level.
6Tap the arrow to return to the Settings screen.
SMART HOME SCREEN
1Tap Settings .
2Tap Smart Home .
IC-24C(I)
Controls and Operation
OPTION SCREEN (continued)
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3The screen for the smart home feature appears.
Smart Grid
Enable
4Tap Enable to turn on the smart home feature.
5Tap Disable to turn off the smart home feature.
6Tap the arrow to return to the Settings screen.
CLOCK SCREEN
1Tap Settings .
2Tap Set Clock .
3The Clock screen appears.
AM
11:17
Clock
4Tap the hour indicator, then tap + or - to adjust the hour.
5Tap the minute indicator, then tap + or - to adjust the
minutes.
6Tap the AM/PM indicator, then tap + or - to adjust AM or
PM.
7Tap the arrow to return to the Settings screen.
LANGUAGE SCREEN
1Tap Settings .
2Tap Language .
3Touch the desired language.
TIP: The available languages are English, Spanish, French,
German, and Italian.
4Tap the arrow to return to the Settings screen.
INFORMATION SCREEN
1Tap Settings .
2Tap Information .
3The Info screen appears.
Info
Filters Versions Errors
Customer Service 1-800-222-7820
Serial#
4Touch the type of information needed.
TIP: The Information screen has four options: Filters, Versions,
Errors, and Serial#.
5Tap the arrow to return to the Settings screen.
FILTERS SCREEN
1Tap Settings .
2Tap Information .
3Tap Filters. The Filters screen appears with the filter use
remaining percentages.
Filters
0%
Press and hold 5s to reset filter
0%
4Touch and hold the water filter icon or the air filter icon for
five seconds to snooze the filter reminder or reset the water
filter or air filter.
5The change filter message is displayed for the air filter or
water filter when the filter is spent and 0% remains.
6Tap Snooze to turn the reminder off for one week if a
replacement filter is not available.
7Tap Reset Filter if replacing the filter. Tap Yes to reset the
filter life, or tap No to exit this screen.
Change Water Filter
snooze reset filter
IC-24C(I)
Controls and Operation
SMART HOME SCREEN (continued)
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8Tapping Enabled causes Enabled to turn bold and turns on
the filter life timer. Turn on the filter life timer if the unit water
filter and/or air filter is in use.
9Tapping Disabled causes Disabled to turn bold and turns off
the filter life timer. Turn off the filter life timer if the unit water
filter and/or air filter is not in use.
Reset Filter Life Timer?
1-800-222-7820/www.subzero.com
Yes No Disabled/
Enabled
10 After resetting the air or water filter, the Filters screen
appears.
11 Tap the arrow to return to the Settings screen.
VERSIONS SCREEN
1Tap Settings .
2Tap Information .
3Tap Versions from the Info screen, and the Versions screen
appears.
Versions
UIM
HLA
CCM
10.00.10
00.00.00
00.00.00
4Tap the arrow to return to the Settings screen.
ERROR INFORMATION SCREEN
1Tap Settings .
2Tap Information .
3Tap Errors on the Info screen, and the Errors screen
appears.
Errors
00 00 0000 00 00 00 00 00
00 00 00 00 00 00 00 00 00
4Tap the arrow to return to the Settings screen.
SERIAL# SCREEN
1Tap Settings .
2Tap Information .
3Select Serial# from the Info screen, and the Serial# screen
appears.
Serial#
Control
Unit
UIM
000000000
000000000
000000000
4Tap the arrow to return to the Settings screen.
TEMPERATURE UNITS SCREEN
1Tap Settings .
2Tap Temperature Units .
3The Select Units screen appears.
Select Units
°C °F
4Tap °C or °F.
5Tap the arrow to return to the Settings screen.
IC-24C(I)
Controls and Operation
FILTERS SCREEN (continued)
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BRIGHTNESS AND CONTRAST SCREEN
1Tap Settings .
2Tap Brightness and Contrast .
3The Brightness and Contrast screen appears.
Brightness & Contrast
4Slide the brightness bar to the desired level.
5Slide the contrast bar to the desired level.
6Tap the arrow to return to the Settings screen.
SOUND SCREEN
1Tap Settings .
2Tap Alarm Volume and Pitch .
3The Sound screen appears.
Sound
Volume Pitch
L
M
H
4Tap the desired volume level.
5Tap the desired pitch level.
6Tap the arrow to return to the Settings screen.
DOOR ALARM TIME SCREEN
1Tap Settings .
2Tap Alarm Duration .
3The Door Alarm Time screen appears.
60S+ -
Door Alarm Time
4Tap the + or - to adjust the alarm duration between five and
90 seconds.
5Tap the arrow to return to the Settings screen.
SABBATH MODE STAR-K SCREEN
1Tap Settings .
2Tap Sabbath Mode .
3The screen for Sabbath mode appears.
Press and Hold 10s
to Enable Sabbath
4To enter Sabbath mode, touch and hold for 10 seconds.
Sabbath: Touch
Screen for 5s to Exit
5To exit Sabbath mode, touch and hold the screen for five
seconds.
6Tap the arrow to return to the Settings screen.
SERVICE OPTIONS SCREEN
1Tap Settings .
2Tap Service Options .
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3The Service Options password screen appears.
-- - -
Enter Password
4Enter the password.
X
Enter Password
5The Service Options menu appears.
Errors
Temp
Log
Manual
Activation
Models
Defrost
Zone
Disable
Service Options
6Tap the arrow to return to the Settings screen.
SERVICE OPTIONS SCREEN
To use a service option, scroll the Service Options screen and tap
the menu item.
SERVICE OPTIONS MENU
Menu Item Description
Errors View list of logged error codes
Temp Log View temperature history by zone
Models Set model code
Manual Activation Activate components by zone
Defrost Initiate freezer defrost
Zone Disable Disable zone
Temps View current temperatures by zone
Offset Offset temperature in zone ± 10°
USB Download data to a USB
Audit Verify model
Clear Faults Clear stored errors
SERVICE OPTION ERRORS SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Errors from the Service Options screen.
4The Errors screen appears.
Errors Codes ( 0/ 0)
Inactive Severity: 0
Age: 0d 0hrs
00 0 00
5Scroll the error code left to view other errors.
6Tap the arrow to return to the Settings screen.
TEMPERATURE LOG
1Tap Settings .
2Tap Service Options .
3Tap Temp Log from the Service Options screen.
4The Temperature Log screen appears.
Temperature Log
Zone 1 Zone 2
TIP: Zone 1 is the top drawer, and Zone 2 is the bottom drawer.
5Tap the desired zone. The temperature log for that zone
appears.
Zone1 Temp: 0/ 0 PWR:
Cabinet - 65° Condenser - 65°
Evap - 65° Ambient - 65°
TIP: Unused thermistor locations read as -65°.
6Tap the arrow to return to the Temperature Log screen.
IC-24C(I)
Controls and Operation
SERVICE OPTIONS SCREEN (continued)
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7Scroll the temperatures left to see the stored temperature
history.
MODEL CONFIGURATION SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Model from the Service Options screen.
4The Set Model Configuration screen appears.
Set Model Configuration ( 0/ 0)
Slide For More
0000000000
5Scroll left to the correct model number.
6Tap the new model number.
7Tap the arrow or No to return to the previous screen.
Set Model Configuration
Confirm ?Yes No
8Tap Yes to confirm the model number.
Set Model Configuration
Programming..
9Once the programming is complete, the Complete!
message appears.
Set Model Configuration
Complete !
10 Once the model number is configured, the Service Options
screen appears.
MANUAL COMPONENT ACTIVATION SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Manual Activation.
4The Manual Component Activation screen appears.
Manual Component Activation
Zone 1 Zone 2
5Tap the desired zone.
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Controls and Operation
TEMPERATURE LOG (continued)
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6The Component Activation screen for the selected zone
appears. Tap the arrow to return to the Manual Component
Activation screen.
Component Activation Zone 1
Dispenser Water Baffle Compressor Condenser
Slide For More Components
COMPONENT ACTIVATION
Refrigerator Components Freezer Components
Dispenser Ice Maker
Water Enable Water Enable
Baffle Ice Water
Compressor Defrost
Condenser Compressor
Evaporator Condenser
Lights Evaporator
Lights
7Tap the component to activate. The component name turns
black, indicating the component is active.
8Tap the arrow to return to the Settings screen.
MANUAL DEFROST SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Defrost from the Service Options screen.
4The Manual Defrost screen appears.
Manual Defrost
Start
5Tap Start to begin manual defrost.
Manual Defrost
Currently Defrosting...
6The Currently Defrosting message appears.
7Tap the arrow to return to the Settings screen.
DISABLE COOLING ZONE SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Zone Disable from the Service Options screen.
4The Disable Cooling Zone screen appears with the status of
each zone.
Disable Cooling Zone
Enabled
Zone 1 Zone 2
Enabled
5Tap the zone to enable or disable it, then the Zone Disable
Confirmation screen appears.
6Tap Yes to enable or disable the zone. Tap No or the arrow
to cancel.
TIP: When a zone is disabled, EE appears on the UIM.
7Tap the arrow to return to the Settings screen.
CURRENT TEMPERATURES SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Temps.
IC-24C(I)
Controls and Operation
MANUAL COMPONENT ACTIVATION SCREEN (continued)
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4The Current Temperatures screen appears. Tap the Arrow to
return to the Service Options screen.
Current Temperatures
Zone 1 Zone 2
5Tap the desired zone.
6The current temperatures for the zone appear. Tap the arrow
to return to the Current Temperatures screen.
Current Temperatures: Zone 1
Cabinet - 65° Condenser - 65°
Evap - 65° Ambient - 65°
ZONE TEMPERATURE OFFSET SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Offset.
4The Zone Temp Offset screen appears. Tap the arrow to
return to the Service Options screen.
Zone Temp Offset
Zone 1
4° 0°
Zone 2
5The current offset is shown. Tap the temperature of the
zone to adjust.
TIP: A positive offset causes the zone to run colder. A negative
offset causes the zone to run warmer.
6The Zone Temp Offset adjustment screen appears.
Zone Temp Offset
4° + -
7Tap the + or - symbols to adjust the temperature offset. Tap
the temperature to return to the previous screen.
USB SCREEN
This screen is only for use by Sub-Zero Group engineering and
is not intended for use by service technicians.
AUDIT SCREEN
This screen is only for use by Sub-Zero Group engineering and
is not intended for use by service technicians.
CLEAR FAULTS SCREEN
1Tap Settings .
2Tap Service Options .
3Tap Clear Faults.
4The Clear Faults screen appears.
Clear Faults
Clear Cancel
5Tap Cancel to return to the Service Options screen.
6Tap Clear to clear error codes.
7The Cleared! message appears.
Clear Faults
Cleared!
IC-24C(I)
Controls and Operation
CURRENT TEMPERATURES SCREEN (continued)
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8After 10 seconds, the Service Options screen appears.
SHOWROOM MODE SCREEN
1Tap Settings .
2Tap Service Options .
3When the password screen appears, enter the password for
Showroom mode. Tap the arrow key to cancel and return to
the Service Options menu.
Enter Password
X
4If the correct password is entered, the Showroom Mode
screen appears.
Showroom Mode
Start
5Tap Start to enter Showroom mode.
6Tap Stop to exit Showroom mode.
DRAWER/DOOR SWITCH OPERATION
Opening the door or drawer closes the switch, completing a
circuit to the control board. If the unit is on and not in Sabbath
mode, the control board:
▪Enables appropriate lights and internal dispenser operation.
▪Disables the evaporator fan, ice maker, and air purification
fan.
▪Monitors how long the door switch is closed to control the
door ajar alarm.
If the unit is in Sabbath mode, the control board:
▪Reduces lights to 30% illumination regardless of the door
switch position.
▪Does not disable the evaporator fan or air purification
system when the door or drawer opens.
EVAPORATOR FAN OPERATION
Evaporator fans are brushless direct current (BLDC) motors.
When the unit is on, the evaporator fan supply is 12 VDC at all
times. The control board monitors revolutions per minute (RPM).
On some models, the evaporator fan always runs at high speed.
On other models, the speed command drops to low speed after
30 seconds.
Operation of the refrigerator and freezer evaporator fans differ
during compartment defrost. See Freezer Adaptive Defrost for
freezer fan operation and Fan-Assisted Off-Cycle Defrost for
refrigerator fan operation.
EVAPORATOR FAN ACTIONS
Control Board Detects Action
High offset temperature
Control board sends high
speed signal to evaporator
fan.
Compartment temperature
above high offset on models
where evaporator fan speed
lowers
Evaporator fan continues to
run at high speed until
temperature drops below high
offset.
Compartment low offset
temperature
▪Door/drawer switch
closes.
▪Control board sends zero
speed command to
evaporator fan.
▪Evaporator fan stops.
Open door/drawer when
evaporator fan is running
▪Door/drawer switch
closes.
▪Control board sends zero
speed command to
evaporator fan.
▪Evaporator fan stops.
Open door/drawer when unit
is in Sabbath mode
▪Door/drawer switch
closes.
▪Control board does not
change fan speed.
Max Ice feature on
Freezer evaporator fan:
▪Runs 100% of the time.
▪Runs at high speed when
freezer compressor is on.
▪Runs at low speed when
compressor is off.
IC-24C(I)
Controls and Operation
CLEAR FAULTS SCREEN (continued)
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FAN-ASSISTED OFF-CYCLE DEFROST
If the refrigerator compartment temperature reaches high offset
but the refrigerator evaporator temperature is too low for the
refrigerator compressor to start, the control board sends a high-
speed run signal to the refrigerator evaporator fan. This sends
warm air across the refrigerator evaporator, causing the
evaporator temperature to rise. Once the refrigerator evaporator
temperature rises to the set point required by the control board,
the control board starts the compressor.
▪If the control board senses that the refrigerator
compartment temperature is below 36°F, it will extend the
defrost time before starting the evaporator fan.
▪If the refrigerator compartment thermistor is shorted or
open, an EE displays on the UIM, the service wrench icon
flashes, and a fault code is logged. The refrigerator
compressor defaults to 20 minutes on and 40 minutes off.
▪If the refrigerator evaporator thermistor is sensed as being
shorted or open, an EE is visible in the Service Options -
Temps screen, the service wrench icon flashes, and a fault
code is logged. The refrigerator compressor does not start
until the refrigerator compartment thermistor reads 37°F
above high offset.
▪In Sabbath mode, the refrigerator compartment thermistor
still controls the refrigerator compressor, except a random
15 to 25 second delay occurs before the cooling cycle
starts.
FREEZER ADAPTIVE DEFROST
With Adaptive Defrost, the control board monitors the length of
time the defrost heater stays on to reach the set temperature at
the evaporator thermistor. Initially, the freezer compressor runs
for six hours, then the compressor and evaporator fan switch
off, and the control board defrost relay closes, supplying power
to the defrost system. After the initial pull-down, the control
board uses the length of time to calculate the number of hours
before the next defrost interval. During Adaptive Defrost, the
control board prevents the freezer temperature displayed on the
UIM from changing.
▪If the heater energizes for a shorter time period than the
control board estimates based on predetermined
algorithms, the control board increases the next defrost
interval.
▪If the heater energizes for a longer time period, the control
board decreases the next defrost interval.
▪Adaptive defrost is an ongoing process where the defrost
heater on-time and the defrost interval vary by unit use.
▪Minimum defrost interval is six hours of compressor run
time.
▪Maximum defrost interval is 80 hours of compressor run
time.
▪Maximum defrost duration is 30 minutes, plus a five-minute
dwell time.
▪If the defrost sensing line is open, the service wrench
flashes, a fault code logs, and the control board defrosts
the unit for 25 minutes after every six hours of freezer
compressor run time.
ICE MAKER MONITORING
EXCESSIVE COMPRESSOR RUN
The control board monitors the position of the compressor
relays to determine the amount of time the compressor runs.
To clear fault indicators and fault codes, correct the problem
and clear the faults from the Service Options screen on the
UIM. Failure to clear fault codes results in the highest priority
fault indicator reappearing on the UIM when the unit is turned
back on.
COMPRESSOR RUN
Compartment If Then
Refrigerator
Compressor runs
four hours, five
consecutive times
▪Fault code
logged
▪Defrost initiated
▪Service wrench
flashes
Freezer
Compressor runs
six hours, five
consecutive times
▪Fault code
logged
▪Defrost initiated
▪Service wrench
flashes
Refrigerator or
Freezer
▪24 hours of
100% run
▪Compartment
temperature still
higher than the
average of set
point and low
offset
temperature
▪Door/drawer is
not opened
during last run
period
▪Unit is switched
off then back on
▪Service wrench
flashes
▪Alarm sounds
▪Compressor will
not energize for
at least three
minutes to
protect
electricals
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Controls and Operation
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