Sub-zero Wolf iw series User manual

Controls & Operation 7

subzero.com 800.222.7820

Integrated Wine Storage

Service Manual

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Electronic Control Info. INTEGRATED WINE (IW) SERIES

INTEGRATED WINE (IW) SERIES

ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS

The appliances described in this manual utilize an electronic control system which monitors, regulates, controls and

displays a variety of functions and operations in the appliance.

The table below defines some of the basic electronic control system terminology.

Term/Component Definition / Description

Main Control Board ..……….… (Also referred to as the Main “Controller” Board), is the printed-circuit board (PC

Board) which contains a microprocessor, relays, triacs and electrical connections

that monitor and control all functions of the appliance.

Microprocessor ……….….…... An electrical component on the control board which receives electrical signals from

other components, processes the information, then sends electrical signals to relays

and triacs on the board to open or close, switching components in the appliance

ON or OFF.

Relay ……………………….…. An electrical component on the control board which switches other components in

the appliance ON or OFF when instructed to do so by the microprocessor.

Triac ……………………....…… Similar in function to a relay, the triac is a three terminal semiconductor for control-

ling current in either direction.

User Interface Module (UIM) .. (a.k.a. Control Panel or Key Pad), is that part of the electronic control system where

all manual input operations are performed, also where all icons, words and codes

are displayed

LCD (Liquid Crystal Display) ... A semi-liquid substance sandwiched between glass in the control panel assembly.

The molecules of this semi-liquid substance have no specific orientation. However,

when electricity is applied to them, they react predictably, aligning and straightening

in such a way as to control light passage. In doing so, they can be manipulated

and arranged to form the indicators that appear in the LCD. This is part of the UIM.

Indicators .....………….………... The icons, numbers and words that appear at the LCD

Error Codes (Fault Codes) ........The code number indicators that appear on the LCD during diagnostic mode This

coded data represents current and/or historical problematic events that specific

electronic components may have experienced.

Display Units of Measure……... Temperatures displayed at the LCD may be in fahrenheit units of measure (°F) or

celsius units of measure (°C). A series of key strokes allows the temperature dis-

play units of measure to be switched to read as either °F or °C.

Set-Point ……..…………..…….. The desired zone temperature, established by pressing the COLDER or WARMER

keys.

High Offset (Cut-in)……….….....As the zone air temperature cycles up and down, the high offset is the maximum

zone temperature that the electronic control system will allow before calling for

cooling.

Low Offset (Cut-out)…….……... As the zone air temperature cycles up and down, the low offset is the minimum

zone air temperature that the electronic control system will allow before interrupting

cooling.

Thermistor....….......................... (a.k.a. a Temperature Sensor) A resistor with which resistance changes as the tem-

perature around it changes. For electronic control system purposes, the micro-

processor measures this resistance and displays it as a temperature reading at the

LCD.

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INTEGRATED WINE (IW) SERIES

INTEGRATED WINE (IW) SERIES Electronic Control Info.

Figure 2-1. IW-30R Electronic Control System Diagram

BASIC ELECTRONIC CONTROL SYSTEM

Input operations for the electronic control system are performed at the UIM, with monitoring, regulating and control-

ling taking place at the control board. Temperatures and possible problems with the unit are displayed in the UIM

depending on the commands given. This page contains an IW-30R wire schematic showing the electronic control

system which is described in greater detail on the following pages.

BLUE/GREEN

BROWN

BLUE/PURPLE

BROWN

BLUE/BLACK

BROWN

BLUE

BROWN

BLUE/YLW

BROWN

BLUE/ORANGE

BROWN

HIGH VOLTAGE

LOW VOLTAGE

L1 NEUTRAL

115 VOLTS

60 CYCLES

WHITE

BLACK

WHITE

CONDENSER FAN MOTOR

WHITE/RED M

PURPLE

GRAY

WHITE

BLACK

GRAY

PURPLE

WHITE

REF COMPRESSOR

STARTING RELAY

WINE COMPRESSOR

STARTING RELAY

(DOT

DENOTES

PIN #1 LOCATION)

MAIN CONTROL

OARD

ST-1

4321

ST-2

321

ST-3

12345

ST-6

ST-4

123456

ST-5

ST-12

ST-8 ST-9 ST-11

ST-13

ST-10

ST-7

FOR OPTIONAL

HOME ALARM HOOK-UP

GRAY/WHITE

WHITE/RED

KEYPAD

RED/WHITE

YELLOW/RED

YELLOW/WHITE

BROWN/WHITE

(DOT

DENOTES

PIN #1 LOCATION)

MAIN CONTROL

BOARD

ST-1

ST-2

ST-3

ST-6

ST-4 ST-5

ST-12 ST-8 ST-9 ST-11

ST-13

ST-10

ST-7

6 8

1 35 7911

1234567

BLUE

WHITE

WHITE/RED

BLUE/RED

RED

REF

STOP

VALVE

BLACK/YELLOW

YELLOW

DOOR SW

N.O.

N.O. N.O.

BLACK/ORANGE

BLACK/GREEN

YLW/GRN

RED/GREEN

YELLOW/ORANGE

RED/ORANGE

UPPER DRAWER

LED

LOWER DRAWER

LED

LOGO

LED

UPPER

LED

LOWER

LED

THERMISTOR (REF EVAP)

THERMISTOR (REF CAB)

THERMISTOR (EVAP LWR)

THERMISTOR (CAB LWR)

THERMISTOR (EVAP UPR)

THERMISTOR (CAB UPR)

BLACK/GREEN

YELLOW/GREEN

RED/GREEN

UPR DRWR SW LWR DRWR SW

YLW/ORN

BLUE/ORN

WINE LWR EVAP FAN

WINE UPR EVAP FAN

REF EVAP

FAN MOTOR

RED

YELLOW

BLUE

BLACK/RED

YELLOW/BROWN

BLUE/BROWN

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(DOT DENOTES

PIN #1 LOCATION)

MAIN CONTROL BOARD

ST-1 ST-3 ST-4 ST-5 ST-7 ST-10

ST-6

ST-13

ST-11

ST-9

ST-8ST-12

ST-2

Figure 2-2. Control Board Layout

Figure 2-3. Control Board Summary Table (IW-30R Summary Table Shown)

CONTROL BOARD LAYOUT AND SUMMARY TABLE

The electrical connection points on the control board are labeled alphanumerically. These labels correspond with

the alphanumeric control board summary table, located on the wiring diagrams. By referencing the summary table,

it is possible to identify which components are connected at which connection points on the control board. Below is

a layout diagram of the control board, and a copy of a summary table. (See Figures 2-2 and 2-3)

NOTE: 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.

IW-R CONTROL BOARD SUMMARY

CIRCUIT DESCRIPTION

120 VOLTAGE

LOW VOLTAGE CIRCUITS

THERMISTOR CIRCUITS

LOW VOLTAGE CONT.

FUNCTION COLOR CIRCUIT DESCRIPTION FUNCTION COLOR

ST1-1

ST1-2

ST1-3

ST1-4

ST2-1

ST2-2

ST2-3

ST3-1

ST3-2

ST3-3

ST3-4

ST3-5

ST4-1

ST4-2

ST4-3

ST4-4

ST4-5

ST4-6

ST5-1

ST5-2

POWER IN (L1)

WINE COMPRESSOR

REF COMPRESSOR

UNUSED

LINE POWER SUPPLY

NEUTRAL

EARTH GROUND

UNUSED

CONDENSER FAN

HOME ALARM

POWER INTO BOARD

POWER WINE COMPRESSOR

POWER REF COMPRESSOR

UNUSED

POWER INTO BOARD

NEUTRAL INTO BOARD

GROUND

UNUSED

POWERS CONDENSER FAN

HOME ALARM COMMON

HOME ALARM NORMALLY OPEN

BLACK

GRAY

PURPLE

ST10-1

ST10-2

ST10-3

ST10-4

ST10-5

ST10-6

ST10-7

UNUSED

UIM 12V POWER

UIM CAN BUS

UIM GROUND RETURN

UNUSED

UIM POWER

UIM CAN_H

UIM CAN_L

UIM RETURN

RED/WHITE

YELLOW/RED

YELLOW/WHITE

BROWN/WHITE

ST11-1

ST11-2

ST11-3

ST11-4

ST11-5

ST11-6

ST11-7

ST11-8

UNUSED

ST12-1

ST12-2

ST12-3

ST12-4

UNUSED

ST13-1

ST13-2

ST13-3

ST13-4

ST13-5

ST13-6

ST13-7

ST13-8

ST13-9

ST13-10

STEPPER VALVES WINE

UNUSED

OUTPUT 1B

OUTPUT 1A

OUTPUT 2A

OUTPUT 2B

POWER

UNUSED

BLUE

WHITE

WHITE/RED

BLUE/RED

RED

ST6-1

ST6-7

ST6-2

ST6-8

ST6-3

ST6-9

ST6-4

ST6-10

ST6-5

ST6-11

ST6-6

ST6-12

WINE UPPER CABINET

WINE UPPER EVAPORATOR

WINE LOWER CABINET

WINE LOWER EVAPORATOR

REF CABINET

REF EVAPORATOR

SENSES TEMPERATURE

BLUE/ORANGE

BROWN

BLUE/YELLOW

BROWN

BLUE

BROWN

BLUE/BLACK

BROWN

BLUE/PURPLE

BROWN

BLUE/GREEN

BROWN

BLACK

WHITE

GREEN/YELLOW

WHITE/RED

GRAY/WHITE

WHITE/RED

ST7-1

ST7-2

ST7-3

ST7-4

ST7-5

ST7-6

ST7-7

ST7-8

ST7-9

ST7-10

ST7-11

ST7-12

ST8-1

ST8-2

ST8-3

ST8-4

ST8-5

ST8-6

ST9-1

ST9-2

ST9-3

ST9-4

ST9-5

ST9-6

ST9-7

ST9-8

ST9-9

UNUSED

EVAP FAN 12 VDC POWER

WINE EVAP FAN

EVAP FAN GROUND RETURN

WINE EVAP FAN

REF EVAP FAN

DOOR LED

DOOR SWITCH

UNUSED

DOOR SWITCH GROUND

UNUSED

EVAP FAN POWER

VAR. SPEED CONTROL OUT

TACH INPUT

EVAP FAN RETURN

VAR. SPEED CONTROL OUT

TACH INPUT

VAR. SPEED CONTROL OUT

TACH INPUT

DOOR LED POWER

DOOR LED PWM

DOOR LED GROUND

DOOR LED POWER

DOOR LED PWM

DOOR LED GROUND

DOOR SWITCH INPUT

UNUSED

GROUND

RED

YELLOW

BLUE

BLACK/RED

YELLOW/BROWN

BLUE/BROWN

YELLOW/PINK

BLUE/PINK

RED/GREEN

YELLOW/GREEN

BLACK/GREEN

RED/ORANGE

YELLOW/ORANGE

BLACK/ORANGE

YELLOW/BLACK

BLACK/YELLOW

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INTEGRATED WINE (IW) SERIES

INTEGRATED WINE (IW) SERIES Electronic Control Info.

UIM (User Interface Module)

There are many possible UIM model configurations and many facets to, or “screens” on, the UIM in general.

Following are renditions of the different Screens that may be viewed on the UIM.

Boot-up Screen

This screen appears when power is initially supplied to the unit and displays the model code. (See Figure 2-4)

Power

Figure 2-5. Power Screen. Touch Power for Approximately Two (2) Seconds to Switch Unit On.

Loading, Please Wait...

IW30R

Figure 2-4. Initial Boot-up Only (IW-30R Model Code Shown)

Power Screen

This screen appears after initial boot-up. To switch the unit on, touch Power for two (2) seconds and current internal

temperature readings will appear on the UIM. (See Figure 2-5)

power

°°

7070

Figure 2-6. Home Screen. Touch Appropriate Temperature to Adjust Set-Point

Home Screen (Wine Zones Only, Does Not Apply to Refrigerator Drawer Zone in IW-30R)

This screen appears after the power screen, meaning the unit is powered on. Real time temperatures are shown. To

view and/or adjust set-points touch the desired zone temperature (See Figure 2-6)

NOTE: If power is touched for approximately two (2) seconds while on the Home Screen, the unit will be switched

off and the Power Screen will appear.

Figure 2-7. Set-Point Adjust Screen. Touch Appropriate “+” or “-” icon to Adjust Set-Point

Temperature Set-Point Adjust Screen

This screen appears after the desired zone temperature reading is touched. Adjust the set-point by touching the “+”

or “-” icon in multiple strokes (See Figure 2-7). Wine storage temperature range is 40°F (4°C) to 65°F (18°C).

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select option

Figure 2-8. Option Screen - IW-18, IW-24, !W-30

select option

Figure 2-9. Option Screen - IW-30R

Option Screen

After a unit is switched on, whenever the door is opened the option screen will appear for 2 to 4 seconds, or from

the home screen press the arrow icon on the right of the display. Below are the different option screens depending

on the model (See Figure 2-8 and Figure 2-9). Touch the icon option desired on or off (see Option Screens Icon

table below, Figure 2-10). A dark icon means that feature is active.

Figure 2-10. Option Screen Icons Explained

NOTE: Touching the arrow icon will return to the home screen, or wait 10 - 15 seconds after the last icon press.

OPTIONS SCREEN

Touch to activate or deactivate door/drawer alarm.

Touch to activate accent lighting.

Touch to activate humidor feature.

Touch to adjust drawer temperature (IW-30R only).

Touch to view settings screen.

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select option

IW-30R Drawer Temperature Set-Point Adjust

To adjust the drawer zone temperature of a IW-30R, first initiate the Options Screen, then:

1. Touch drawer icon (See Figure 2-11).

2. The drawer temperature is displayed. Touch drawer temperature (See Figure 2-12)

3. Temperature Set-Point Adjust Screen is displayed. Touch the “+” or “-” icon in multiple strokes to change the

temperature (See Figure 2-13).

NOTE: Refrigerator temperature range is 34°F (1°C) to 45°F (7°C).

Figure 2-11. Access IW-30R Drawer Temperature

Figure 2-12. Touch Temperature to Adjust Set-Point

Figure 2-13. Touch Appropriate “+” or “-” icon to Adjust Set-Point

NOTE: Touching the temperature will return to the home screen, or wait 10 - 15 seconds after the last icon press.

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Settings Screen

Touching the settings icon (the cog) on the Option Screen will bring up the settings screen, allowing the different set-

tings to be adjusted. The settings screen scrolls in a loop, but the icons are shown in static format below (See

Figure 2-14). Also see Settings Screen Quick reference Table (See Figure 2-15).

Settings

Figure 2-14. Settings Screen and All Icons

SETTINGS SCREEN QUICK REFERENCE TABLE

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.

Touch to set clock.

Touch to select smart home options.

Touch to select language options.

Touch to adjust soft on lighting.

Figure 2-15. Settings Screen Quick Reference

Lighting Screen

After touching the settings icon (the cog), touch the lighting icon (light bulb icon) on the settings screen to adjust the

lighting delay effect and the intensity. Touch the appropriate slide bar(s) to adjust (See Figure 2-16).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

Soft On

Dimming Accent

Figure 2-16. Lighting Screen

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Clock Screen

After touching the settings icon (the cog), touch the clock icon on the settings screen to view or adjust the clock

time. Touch the hour, minute or the AM / PM indicator to adjust the appropriate icons (See Figure 2-17).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

:17

Clock

Figure 2-17. Clock Screen (changing minutes)

Language Screen

After touching the settings icon (the cog), touch the language icon (globe icon) on the settings screen to display the

words on the UIM in the desired language. Touch the language desired (See Figure 2-18).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

Languages

English Spanish Italian

French German

Figure 2-18. Language Screen (choosing English)

Information Screen

After touching the settings icon (the cog), touch the information icon (circle with an “i” in the middle icon) on the set-

tings screen to display filter life, versions of the software, error codes and serial numbers. Touch the appropriate

word to display the desired information (See Figure 2-19).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

Info

Filters Versions Errors

Customer Service 1-800-222-7820

Serial#

Figure 2-19. Information Screen

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Temperature Units of Measure Screen (choosing Fahrenheit or Celsius Temperature Display)

After touching the settings icon (the cog), touch the temperature units of measure icon (°C/°F icon) on the settings

screen to view or change the units of measure. To choose, touch the desired unit of measure (See Figure 2-20).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

Select Units

°C °F

Figure 2-20. Units of Measure Screen (Fahrenheit chosen)

Brightness and Contrast Screen (choosing Fahrenheit or Celsius Temperature Display)

After touching the settings icon (the cog), touch the brightness and contrast icon (1/2 dark sun icon) on the settings

screen to view or change the brightness and/or contrast of the LCD of the UIM. Touch the appropriate slide bar(s) to

adjust (See Figure 2-21).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

Brightness & Contrast

Figure 2-21. Brightness & Contrast Screen

Sound Screen

After touching the settings icon (the cog), touch the door alarm volume and pitch icon (speaker icon) on the settings

screen to view or change the volume and/or pitch of the alarm when the door is left open. Touch the appropriate

volume or pitch icon(s) to adjust (See Figure 2-22).

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

Sound

Volume Pitch

Figure 2-22. Brightness & Contrast Screen

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Door Alarm Time Screen

After touching the settings icon (the cog), touch the door alarm time icon (bell with clock inside icon) on the settings

screen to adjust the amount of time it takes the alarm to chime when the door is left open. Touch the appropriate “+”

or “-” icon to adjust (See Figure 2-23). Minimum time is five (5) seconds; Maximum time is ninety (90) seconds.

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for ten (10) to fifteen (15)

seconds, the home screen will reappear.

60S+-

Door Alarm Time

Figure 2-23. Door Alarm Time Screen (sixty seconds chosen)

Star-K (Sabbath Mode) Screen

After touching the settings icon (the cog), touch the Star-K icon (Star with “K” inside icon) on the settings screen to

enable the Sabbath mode. Press and hold the Star-K icon for ten (10) seconds to enable Sabbath mode (See

Figure 2-24). When in Sabbath mode the screen will go dark and slowly flash “Sabbath: Touch Screen for 5s to

Exit” (See Figure 2-25). When exited, the home screen will reappear.

Press and Hold 10s

to Enable Sabbath

Figure 2-24. Star-K Screen (Touch Star-K for 10 Seconds to Enable Sabbath Mode)

Sabbath: Touch

Screen for 5s to Exit

Figure 2-25. Star-K Active Screen (Touch Screen for 5 seconds to Exit)

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Service Options Screen

Touch the settings icon (the cog), then touch the service option icon (wrench icon) on the settings screen to view the

Service Options screen. errors, run service tests, activate or deactivate components, etc. When first entered, a

password will be requested (See Figure 2-26). Press each dash in multiple strokes until the appropriate symbols

appear (See Figure 2-27).

----

Enter Password

Figure 2-26. Enter Password Screen. Service Options Screen Code Requested

After the password is entered the Service Options screen appears and the options can be scrolled in a loop. The

options to choose from (words that will show on screen) will be:

• Errors (If viewing errors, see Troubleshooting Guide section in this manual)

• Temp Log

• Models

• Manual Activation

• Zone Disable

• Temps

• Offset

• USB

• Audit

• Clear Faults

Choose the option to be dealt with by touching the appropriate word.

NOTE: Touching the Arrow key will step back one screen. If the screen is not touched for fifteen (15) minutes, the

home screen will reappear.activate or deactivate

Enter Password

Figure 2-27. Service Options Screen Code Entered (Presses 2-3-4-3)

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Showroom Mode

Start

Showroom Mode

Showroom Mode was incorporated into the electronic control system so the appliance could be displayed in a show-

room setting. When in Showroom Mode, all cooling functions are disabled, but the lighting system and UIM remain

active.

To activate (or deactivate) Showroom Mode:

1. On the home screen press the arrow icon.

2. Options screen is displayed. Touching the settings icon (cog icon).

3. Settings screen is displayed. Touch the service option icon (wrench icon).

4. Enter Password screen is displayed (See Figure 2-28). Touch each dash in multiple strokes until the appropri-

ate symbols appear (See Figure 2-29).

5. Showroom Mode screen is displayed. Press Start to activate showroom mode (See Figure 2-30), or press Stop

to deactivate showroom mode.

NOTE: If the screen is not touched for ten (10) to fifteen (15) seconds, the home screen will reappear. To hasten

the process back to the home screen, follow steps 6 through 8 below.

6. Touch the arrow icon to step back to Settings screen.

7. Touch the arrow icon to step back to Select Options screen.

8. Touch the arrow icon to step back to home screen.

NOTE: If activating showroom mode, “showroom” will appear on home screen (See Figure 2-31).

Figure 2-30. Start Showroom Mode

----

Enter Password

Figure 2-28. Enter Password Screen

Enter Password

Figure 2-29. Showroom Mode Code Entered (Presses 3-3-3-2)

power

°°

4555 showroom

Figure 2-31. Home Screen - Unit in Showroom Mode

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INTEGRATED WINE (IW) SERIES

FUNCTIONS OF THE ELECTRONIC CONTROL SYSTEM

The following pages explain monitoring, regulating and controlling functions of the IW electronic control system.

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 screen. When the door (or a drawer on IW-30R only) is open, the corresponding normally open switch

sends a signal to the control board and a relay on the board allows power to the 12V DC lighting system.

NOTES:

• Door and Drawer switch operation is monitored by the microprocessor to control the door ajar alarm feature.

• Door and Drawer switch operation is also monitored to help control the evaporator fan operation. When the door

(or a drawer on IW-30R only) is open, power to the evaporator fan is interrupted. When a wine storage door is ini-

tially closed, the evaporator fans are energized for five (5) minutes, regardless of compressor run state, to prevent

condensation on the door glass.

• If in Sabbath Mode, the lighting system is on at 30% brightness regardless of switch operation.

Monitor, Regulate and Display Compartment (Zone) Temperatures

The temperature signals from the compartment thermistors are monitored by the microprocessor. When high offset

temperature is detected, calling for cooling, a high-speed run command is sent to the appropriate evaporator fan.

When the evaporator temperature climbs to 38-44°F (3-7°C) the compressor is also energized and the appropriate

side of the wine zones 3-way refrigerant valve is energized to open, beginning the cooling cycle. When the compart-

ment reaches low offset temperature, the fan is switched OFF, but the compressor may stay energized if the other

wine zone is calling for cooling. Though compartment air temperature fluctuates from OFF and ON cycles, it is a

compartment “average” temperature that is displayed.

NOTES:

• Wine zone temperature range is 40°F (4°C) to 65°F (18°C).

• Refrigerator zone temperature range (IW-30R only) is 34°F (1°C) to 45°F (7°C).

• If average compartment temperature changes, the display will change by one degree per minute.

• If a compartment thermistor is faulty, the compressor defaults to X minutes ON, X minutes OFF cycling (cycle

times vary by unit). The appropriate error code is logged and the wrench and error code are splashed on the LCD

for ten (10) seconds to the user upon door opening, but there is no audible error chime.

• If an evaporator thermistor is faulty, the compressor will not energize until compartment air temperature exceeds

high offset by 3°F/C. The appropriate error code is logged and the wrench and error code are splashed on the

LCD for ten (10) seconds to the user upon door opening, but there is no audible error chime.

• If in Sabbath Mode, the compartment thermistor still controls compressor operation, except that when high offset is

reached, there is a random 15 to 25 second delay before the cooling cycle is started.

• The condenser fan is energized whenever a compressor is energized, unless the condenser fan thermistor senses

temperatures below 50°F (10°C).

• Depending on the model, the wine zones evaporator fan may stay energized after the compressor switches off.

This is to allow the humidity to increase in the zone to meet specified standards. This “humidity assist” action will

be either time based or temperature based depending on which limit is reached first.

• If neither wine zone is calling for cooling, the compressor is switched off and a signal is sent to the 3-way refriger-

ant valve to close both sides of the valve.

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Additional Regulating of Compartment Temperatures:

Details of Controlling the Variable Speed Evaporator Fan Motors

The evaporator fan motors are supplied with 12V DC at all times from the control board, with the neutral or ground

return. When high offset temperature is detected a command is sent to the evaporator fan motor to run at high-

speed, and the RPM is monitored. On some models, an evaporator fan will always run at high speed, while on oth-

ers a command will be sent to the fan after a specified time, or temperature to ramp down to low-speed. This will

vary by model. If the door (or a drawer on IW-30R only) is opened while an evaporator fan is operating, the micro-

processor will interrupt the 12V DC power to the fan.

NOTE:

• During Sabbath Mode the lighting system is lowered to 30% brightness and the 12V DC supplied to the evaporator

fan cannot be interrupted, thus the evaporator fan may be observed running when the door is open.

• If improper RPM signals are detected from the evaporator fan, the appropriate fault code will be logged and the

severity of the error will be treated as a 1 or 2, low level.

Monitor and Control Refrigerator Fan-Assisted, Off-Cycle Defrost

Temperature signals from the refrigerator compartment and evaporator thermistors are observed by the microproces-

sor. During the off cycle defrost, if the refrigerator compartment temperature reaches high offset (calling for cooling)

before the evaporator temperature rises to 38-44°F (3-7°C), no power will be supplied to the compressor, but the

evaporator fan will be switched ON. Only after the evaporator temperature reaches 38-44°F (3-7°C) will the com-

pressor be energized.