Sub-Zero 700TC-3, 700TR-3, 700TCI-3, 700TFI-3, 736TC-3 Service Manual

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© SUB-ZERO FREEZER COMPANY INC. 2006 ALL RIGHTS RESERVED JOB AID #3758412 (Revision B - December 2006)

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Integrated

Integrated

(700-

(700-

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TTALL)

ALL)

Series

Series

General Information

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#3758412 - Revision B - December, 2006

SECTION 1

GENERAL

INFORMATION

General Information

Integrated

Integrated

(700-

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ALL)

Series

Series

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#3758412 - Revision B - December, 2006

TECHNICAL ASSISTANCE

If you should have any questions regarding the
700-3 Series and/or this manual, please contact:

Sub-Zero Freezer Company, Inc.

ATTN: Service Department

P.O. Box 44988

Madison, WI 53744 - 4988

Customer Service & Parts / Warranty Claims

Phone #: (800) 222 - 7820

Technical Assistance

Phone #: (800) 919 - 8324

Customer Service & Technical Assistance

Facsimile #: (608) 441 - 5887

Parts / Warranty Claims

Facsimile #: (608) 441 - 5886

Service Department E-Mail Address:

[e-mail]

Office Hours:

7:00 AM to 7:00 PM Central Time

Monday through Friday

IMPORTANT SAFETY INFORMATION

Below are Product Safety Labels used in this manual.
The "Signal Words" used are WARNING or CAUTION.

When reviewing this manual, please note these differ­ent Product Safety Labels placed at the beginning of
certain sections of this manual. You must follow the
instructions given in the boxes of the Product Safety
Labels in order to avoid personal injury and/or product
damage.

The sample Product Safety Labels below illustrate the
precautions that should be taken when the signal word
is observed.

INTRODUCTION

This Technical Service Manual has been compiled to provide the most recent service information for 700-3 Series
Tall units. This information will enable the service technician to troubleshoot and diagnose malfunctions, perform
necessary repairs, and return a unit to proper operational condition.

The service technician should read the complete instructions contained in this manual before initiating any repairs on
a 700-3 Tall Series unit.

INDICATES THAT HAZARDOUS OR UNSAFE PRAC­TICES COULD RESULT IN SEVERE PERSONAL
INJURY OR DEATH.

Indicates that hazardous or unsafe practices could
result in minor personal injury, and/or product dam­age, and/or property damage.

In addition, please pay attention to the signal word
“NOTE”, which highlights information that is espe-
cially important for the topic being covered.

This manual is designed to be used by Authorized Service Personnel only. Sub-Zero Freezer Co., Inc.
assumes no responsibility for any repairs made on Sub-Zero refrigeration units by anyone other than
Authorized Service Technicians.

Information and images contained in this manual are the copyright property of Sub-Zero Freezer Company, Inc.

Neither this manual nor any information or images contained herein may be copied or used in whole or in part

without the express written consent of Sub-Zero Freezer Company, Inc.

© Sub-Zero Freezer Company, Inc, all rights reserved.

Integrated

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Section 1 - General Information 1-1

Introduction ....................................................................... 1-2

Important Safety Information ............................................ 1-2

Technical Assistance ........................................................ 1-2

Table of Contents ............................................................. 1-3

Warranty Information ........................................................ 1-5

Model Description ............................................................. 1-6

Section 2 - Installation Information 2-1

Installation Considerations ............................................... 2-2

Unit leveling ................................................................. 2-2

Door & Drawer Adjustment ........................................... 2-3

Door Stop Adjustment .................................................. 2-3

Dual Unit Installation .................................................... 2-4

Section 3 - Electronic Control System Information 3-1

Terminology & Component Descriptions .......................... 3-2

Basic Electronic Control System ....................................... 3-3

Control Board Layout & Summary Table ......................... 3-4

Control Panel Layout ....................................................... 3-5

Basic Electronic Control Input Operations ....................... 3-5

Unit ON/OFF ................................................................ 3-5

Adjusting Set-Point (Temp. Adjustment) ...................... 3-6

Icemaker System ON/OFF ........................................... 3-6

Door Ajar Alarm Feature ON/OFF ................................ 3-6

Unique Electronic Control Input Operations .................... 3-7

Temperature Units Selection Mode .............................. 3-7

Sabbath Mode .............................................................. 3-8

Showroom Mode .......................................................... 3-8

Manual Zone Disable Mode .......................................... 3-9

Manual Freezer Evaporator Defrost ............................. 3-9

Functions of the Electronic Control System ................... 3-10

Supply Power to the Lighting System ........................ 3-10

Monitor, Regulate & Display Compartment Temp’s ..... 3-11

Control Variable Speed Compressor (700TF/I-3) ........ 3-12

Control Condenser Fan Run ....................................... 3-13

Refrigerator “Fan-Assisted Off-Cycle Defrost” ............. 3-14

Freezer “Adaptive Defrost” .......................................... 3-15

Monitor Compressor Run, Display Service ................. 3-16

Monitor Speed Signal to Variable Speed Comp.,

Display Service (700TF/I-3) ......................................... 3-17

Monitor Ice Making System, Display Service .............. 3-18

Possible Error Indicators ................................................ 3-19

700TC/I-3 & 736TC/I-3 ................................................. 3-19

700TR-3 & 736TR-3 .................................................... 3-20

700TF/I-3 ..................................................................... 3-21

Troubleshooting Input Operations ................................... 3-22

Diagnostic Mode ........................................................ 3-22

Thermistor Location Code Tables ........................... 3-23

Diagnostic Mode Indicators ...................................... 3-23

Error Code Table ...................................................... 3-24

Clearing Error Codes ................................................ 3-24

Manual Component Activation Mode ........................... 3-25

Temperature Log Recall Mode ................................... 3-26

Compartment Temp. History Only ............................ 3-26

Compartment & Evaporator Temp. History .............. 3-27

Possible Event Indicators ..................................... 3-28

Temperature Log Index Chart ................................ 3-29

Section 4 - Sealed System Information 4-1

HFC-134a Refrigerant Service Information ...................... 4-2

General Rules for Working with 134a Refrigerant ........ 4-2

Sealed System Repair Procedures .............................. 4-3

Sealed System Operation ................................................ 4-4

Sealed System Refrigerant Flow Diagrams ..................... 4-6

Models 700TC/I-3 & 736TC/I-3 ...................................... 4-6

Models 700TR-3 & 736TR-3 .......................................... 4-7

Model 700TF/I-3 ............................................................ 4-7

Section 5 - Air Flow & Fan Blade Spacing 5-1

Models 700TC/I-3 & 736TC/I-3 .......................................... 5-2

Models 700TR-3 & 736TR-3 .............................................. 5-3

Model 700TF/I-3 ................................................................ 5-3

Section 6 - Icemaker Information

6-1

Modular Icemaker ........................................................... 6-2

Modular Icemaker Operation ...................................... 6-2

Additional Icemaker Operation Notes ......................... 6-3

What Happens During Ejector Blade Rotation ............ 6-3

Modular Icemaker Test Procedures ................................ 6-4

Voltage Tests ................................................................ 6-4

Continuity Tests & Thermostat Inspection ................... 6-4

Water Fill Adjustment ...................................................... 6-5

Icemaker Disassembly .................................................... 6-5

Module/Motor Assembly ............................................. 6-5

Mold/Heater Assembly ............................................... 6-5

Ejector Blades and/or Ice Stripper .............................. 6-5

Icemaker Thermostat ................................................. 6-5

Section 7 - Component Access and Removal 7-1

Component Access and Removal ............................ 7-2

WARNINGS & CAUTIONS ................................................ 7-2

Exterior Cosmetic and Mechanical Components ......... 7-3

Kickplate/Grille .............................................................. 7-3

Side Molding Strip .......................................................... 7-3

Upper Compartment Light Switch and Fan Switch ........ 7-3

Drawer Assembly .......................................................... 7-4

Door & Drawer Gasket ................................................. 7-4

Door Assembly ............................................................. 7-5

Upper and Lower Hinge Assembly ................................ 7-5

TABLE OF CONTENTS

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General Information

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Interior Cosmetic, Mechanical and Electrical

Components ................................................................... 7-6

Door Shelf and Dairy Compartment ............................ 7-6

Compartment Shelf ....................................................... 7-6

Upper Light Diffuser ...................................................... 7-7

Light Bulb...................................................................... 7-7

Control Board ................................................................ 7-8

Control Panel Assembly ................................................ 7-8

Upper Evaporator Cover / Air Duct ............................... 7-9

Upper Evaporator Fan Shroud Assy ............................. 7-9

Upper Compartment Evaporator Fan Assy .................. 7-10

Upper Compartment Thermistor ...................................7-10

Upper Evap. Thermistor (All Except 700TF/I-3) .......... 7-10

Drawer Closer Assembly .............................................. 7-11

Drawer Slide Assembly ................................................ 7-11

Drawer Slide Pin ....................................................... 7-11

Icemaker Assy. (All Models w/Icemaker) .................... 7-11

Heat Exchanger Cover ................................................ 7-12

Lower Evap. Cover Assy (700TR-3, 736TR-3) ........... 7-12

Lower Evap. Fan Assy (700TR-3, 736TR-3) .............. 7-12

Lwr Cmprtmnt Thermistor (700TR-3, 736TR-3) ........... 7-13

Lwr Evap. Thermistor (700TR-3, 736TR-3) ................. 7-13

Lower Evaporator Cover Assy

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-13

Drain Trough Heater

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-14

Lower Evaporator Fan Shroud

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-14

Lower Evaporator Fan Assy

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-14

Defrost Terminator

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-15

Defrost Heater (700TC/I-3, 700TF/I-3, 736TC/I-3) ...... 7-15

Switch Enclosure Assembly ......................................... 7-16

Lower Evaporator Thermistor

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-16

Lower Compartment Thermistor

(700TC/I-3, 700TF/I-3, 736TC/I-3) ............................... 7-17

Fill Tube Heater (700TC/I-3, 700TF/I-3, 736TC/I-3) .... 7-17

Lower Compartment Light / Fan / Icemaker Switch ..... 7-17

Compressor Area Electrical & Mechanical

Components ................................................................... 7-18

IM Water Valve (700TC/I-3, 700TF/I-3, 736TC/I-3) ..... 7-18

Condenser Fan Assembly ........................................... 7-19

Sealed System Components ....................................... 7-20

Upper Compartment Evap (All Except 700TF/I-3) ...... 7-20

Lower Compartment Evaporator ................................ 7-20

High-Side Filter-Drier ................................................... 7-21

Compressor ................................................................. 7-22

Condenser .................................................................... 7-23

Upper Compartment Heat Exchanger ......................... 7-24

Lower Compartment Heat Exchanger ......................... 7-25

Page #

Page #

Section 8 - Troubleshooting Guides 8-1

How to Use Error Code Troubleshooting Guide ............... 8-2

Error Code Table ............................................................ 8-2

Error Code Troubleshooting Guide ................................ 8-3

How to Use the General Troubleshooting Guide ............. 8-5

General TS Guide Table of Contents ............................. 8-6

Sealed System Troubleshooting / Diagnostic Tables .... 8-20

Normal Operating Pressures ....................................... 8-20

Pressure Indications ................................................... 8-21

Temperature/Low Side Pressure.................................. 8-21

Membrane Switch / Ribbon Cable Test .......................... 8-22

Door Hinge Operation Test & Corrections ..................... 8-23

Section 9 - Technical Data Tables 9-1

Model 700TC/I-3 .............................................................. 9-2

Model 700TR-3 ............................................................... 9-3

Model 700TF/I-3 .............................................................. 9-4

Model 736TC/I-3 .............................................................. 9-5

Model 736TR-3 .............................................................. 9-6

Section 10 - W

iring Diagrams 10-1

700TC/I-3 Wiring Diagram .............................................. 10-2

700TC/I-3 Wiring Schematic ........................................ 10-3

700TR-3 Wiring Diagram ................................................ 10-4

700TR-3 Wiring Schematic .......................................... 10-5

700TR-3 Wiring Diagram ................................................. 10-6

700TR-3 Wiring Schematic ......................................... 10-7

700TF/I-3 Wiring Diagram ............................................. 10-8

700TF/I-3 Wiring Schematic ...................................... 10-9

736TC/I-3 Wiring Diagram ............................................ 10-10

736TC/I-3 Wiring Schematic ...................................... 10-11

736TR-3 Wiring Diagram ............................................... 10-12

736TR-3 Wiring Schematic ........................................ 10-13

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#3758412 - Revision B - December, 2006

736TCI 3 0000000

7.0

9.0 8.1 R134a

Figure 1-1. Serial Tag Layout

(The serial number tag is located on the left side wall of the upper drawer compartment.)

Jul 2005

Model Number

Serial Number

Manufacture Date

Refrigerant Charge

Total Amps Refrigerant Type

WARRANTY INFORMATION

This page summarizes the 2, 5 & 12 Year Residential
Warranty provided with every Sub-Zero, as well as two

special warranties:

• Non-Residential Warranty - Applies to units installed

in non-residential applications.

• Display/Model Home Warranty - Applies to distribu-

tor or dealer display units, and units in model
homes, sold three years after date of manufacture.

Following the warranty summaries are details and notes
about the warranties.

TWO, FIVE & TWELVE YEAR Warranty

• 2 year TOTAL PRODUCT, *parts and labor.

• 5 Year SEALED SYSTEM, **parts and labor.

• 6th - 12th year LIMITED SEALED SYSTEM, **parts
only.

ONE & FIVE YEAR Non-Residential Warranty
(Example: Office, Yacht, etc.)

• 1 Year TOTAL PRODUCT, *parts and labor.

• 5 Year SEALED SYSTEM, **parts and labor.

ONE & FIVE YEAR Display/Model Home Warranty
(Display units sold three years after date of manu­facture)

• 1 Year TOTAL PRODUCT, *parts and labor.

• 5 Year SEALED SYSTEM, **parts and labor.

Warranty Details:

* Includes, but is not limited to the following:

Electronic Control System Components, Fan & Light
Switches, Fan Motors & Blades, Defrost & Drain
Heaters, Defrost Terminator, Drain Pan, Drain Tubes,
Wiring, Light sockets & bulbs, Icemaker, Water Valve,
Door hinges, Door closers & Cams, Compressor
Electricals, etc. . .

* Stainless Steel (Classic, Platinum & Carbon) doors,

panels and product frames are covered by a limited 60
day parts and labor warranty for cosmetic defects.

** Includes the following:

Compressors, Condenser, Evaporators, Filter-Driers,
Heat-exchangers, All Tubing that Carries the Freon.

NOTE: Condenser Fan Motors, Freon, Solder and
compressor electricals are NOT

considered sealed

system parts.

Warranty Notes:

• All warranties begin at unit's initial installation date.

• All Warranty and Service information collected by Sub­Zero is arranged and stored under the unit serial num­ber, and the customer's last name.
Sub-Zero requests that you have the model and serial
number available whenever contacting the factory or
parts distributor.

• The serial tag is located on the left wall of the upper
drawer compartment.

REFRIGERATOR

PRODUCT SERVICE 1-800-222-7820

MODEL

MADISON, WI

REFRIGERANT

FREEZER

FREEZER CO., INC.

SERIAL NUMBER

TOTAL AMPS

115Vac, 60Hz, 1 Phase

LISTED HOUSEHOLD

REFRIGERATOR OR FREEZER

U

R

O

L

CUS

LISTED

776N

Date Code

ALSO VERIFIED IN
ACCORDANCE WITH
ENERGY STANDARD

CAN/CSA-C300-91

General Information

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#3758412 - Revision B - December, 2006

Figure 1-2. Model 700TC-3 & 700TCI-3

Lower Two
Drawer
Freezer
Zone

MODEL DESCRIPTIONS

This page briefly describes the models covered in this 700-3 Tall Unit Technical Service Manual.

Upper
Refrigerator
Zone

Figure 1-3. Model 700TR-3

Lower Two
Drawer
Refrigerator
Zone

Upper
Refrigerator
Zone

700TC-3

700TCI-3

MODEL DESCRIPTION

700 Series, 27

” Wide

Tall Combination

Refrigerator/Freezer

, 3rd Design Build

7

00 Series, 27” Wide

Tall Combination

Refrigerator/Freezer

, w/Icemaker, 3rd Design

Build

700TR-3

MODEL DESCRIPTION

700 Series, 27” Wide Tall Refrigerator, 3rd

Design Build

Integrated

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#3758412 - Revision B - December, 2006

Figure 1-4. Model 700TF-3 & 700TFI-3

All
Freezer
Zone

700TF-3

700TFI-3

MODEL DESCRIPTION

700 Series, 27

” Wide

Tall Freezer, 3rd Design

Build, Variable Speed Compressor

700 Series, 27” Wide Tall Freezer, w/Icemaker,
3rd Design Build, Variable Speed Compressor

Figure 1-5. Model 736TC-3 & 736TCI-3

Lower Two
Drawer
Freezer
Zone

Upper
Refrigerator
Zone

736TC-3

736TCI-3

MODEL DESCRIPTION

700 Series, 36” Wide Tall Combination

Refrigerator/Freezer,

3rd Design Build

700 Series, 36” Wide Tall Combination

Refrigerator/Freezer

, w/

Icemaker, 3rd Design

Build

General Information

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#3758412 - Revision B - December, 2006

Figure 1-6. Model 736TR-3

Lower Two
Drawer
Refrigerator
Zone

Upper
Refrigerator
Zone

736TR-3

MODEL DESCRIPTION

700 Series, 36” Wide Tall Refrigerator, 3rd

Design Build

Integrated

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Installation Information

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#3758412 - Revision B - December, 2006

SECTION 2

INSTALLATION

INFORMATION

Installation Information

Integrated

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#3758412 - Revision B - December, 2006

UNIT COULD TIP FORWARD UNDER CERTAIN LOAD CONDITIONS. FAILURE TO INSTALL ANTI-TIP COM­PONENTS AND EXTEND LEVELERS TO THE FLOOR ACCORDING TO INSTALLATION MANUAL COULD
RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

INSTALLATION CONSIDERATIONS

This section covers some of the more common installation issues seen by a service technician. An improper instal­lation, though not a valid service issue, has the potential to lead to a customer placing a call for service. Installation
related customer complaints could include, but are not limited to: Unit leveling, unit movement, door misalignment,
doors and drawers not sealing, internal frost or condensation, warm compartment temperatures, exterior condensa­tion, etc.. .

NOTE: If additional installation information is needed, refer to the complete Installation Manual and/or installation
video, or contact the Sub-Zero Technical Assistance Department.

Unit Leveling

NOTE: The kickplate/grille must be removed before
leveling (See Figure 2-1). If the unit has already been
anchored to the cabinets, the side molding strips must
be removed and the anchor screws must be extracted
from the unit to cabinet brackets before leveling (See
Figure 2-2). These components must be reinstalled
after leveling.

Figure 2-2. Side Molding & Bracket

Figure 2-1. Kickplate/Grille Removal

Figure 2-3. Adjusting Front Levelers

To level the unit, turn the front leveling legs counter­clockwise to raise the front or clockwise to lower it. To
assist in turning the front leveling legs up or down, use
a standard straight-blade screwdriver and place it in the
foot of the front leg, then rotate the leveler foot in the
desired direction (See Figure 2-3).

Kickplate / Grille

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Installation Information

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#3758412 - Revision B - December, 2006

Figure 2-4. Adjusting Rear Levelers

Figure 2-5. 90° Door Stop Cam

Screwdriver

The rear levelers are adjusted from the front of the
base by turning the Phillips head adjusting screw. The
long adjusting screw reaches all the way to the rear lev­eler assembly. Turn the screw clockwise to raise the
rear or counterclockwise to lower it (See Figure 2-4).

NOTE: The rear leveling legs will only move 1/16” for
every 18 revolutions of the Phillips head screw. Do not
over torque. Use the lowest torque setting on any
power screwdriver. Do not turn rear leveling legs by
hand, doing so will damage the assembly.

Door and Drawer Adjustment

The doors and drawers on 700-2 Series units are non­adjustable. Instead, the door and/or drawer panels
must be adjusted if there is an alignment problem.
Refer to the Installation Manual and/or installation video
for panel installation and adjustment.

NOTE: The unit must be level before attempting to
adjust the door and drawer panels.

NOTE: If the door has problems closing, see Tall Unit
Door Hinge Operation Test Procedures and Corrections
at the end of the Troubleshooting Guide.

Door Stop Adjustment

700-2 Series tall units have a 90° door stop cam built
into the hinge system. The 90° door stop cam is locat­ed in the center portion of each hinge. To adjust it, use
a standard straight-blade screwdriver to rotate the cam
until it reaches the stop point (See Figure 2-5).

NOTE: You must

make this adjustment at both bottom

and top hinge.

90° Stop Cam

Installation Information

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#3758412 - Revision B - December, 2006

Dual Unit Installations

• If two Tall units are installed side by side and are 2”
or less apart, part #TTDUAL should be utilized.
(See Figure 2-6)

• If two Base units are installed side by side and are
2” or less apart, part #BBDUAL should be utilized

• If a Tall unit is installed next to a Base unit and they
are 2” or less apart, part #BBDUAL should be uti­lized.

Complete installation instructions are supplied with the
#BBDUAL and #TTDUAL packages.

Figure 2-6. Dual Unit Heater (#TTDUAL Shown)

Apply heater
to left side of
right hand
unit

If two or more units are placed side by side and are
2” or less apart, a dual unit heater package must be
applied to the left side of the right hand unit.
Failure to install the dual unit heater package could
result in exterior condensation between the units.

Integrated

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Electronic Control System

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#3758412 - Revision B - December, 2006

SECTION 3

ELECTRONIC CONTROL

SYSTEM INFORMATION

Electronic Control System

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ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS

The electronic control system monitors, regulates and controls a variety of functions. It also displays temperature
readings, ice maker system operational status, possible problems with the unit and door ajar alarm status. The table
below defines some basic electronic control system terminology and describes some of the electronic control system
components. An understanding of the following information is needed in order to comprehend the input operations
and functions of the electronic control system.

T

erm/Component Definition / Description

Control Board ……………………..…….. The printed-circuit board (PC Board) contains the microprocessor, relays and

electrical connections which control and monitor all functions and operations of
the appliance.

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

from other components, processes that information, then sends an electrical sig­nal to the relays on the board to open or close, and other electronic components
in the unit to switch on or off.

Relay ………………………………..…… The electrical components on the control board which switch other components in

the unit ON and OFF when instructed to do so by the microprocessor.

LCD (Liquid Crystal Display) …..…...... That part of the control board seen at the control panel which displays zone tem-

peratures, service indicator, door ajar alarm bell & ice indicator.

Control Panel Assembly ……..………… The information input and read-out area of the electronic control system, located

at the top of the upper Compartment.

Membrane Switch …………..………….. An integral part of the control panel assembly, which consists of the function keys

used for all input operations to the electronic control system.

Keys (Function Keys) ………..………… The buttons on the Membrane switch used for input operations. (The keys are:

UNIT ON/OFF, ALARM ON/OFF, ICE ON/OFF, WARMER, COLDER)

Indicators .....…………………..………... The words and numbers that are displayed at the control panel assembly.

(Example: Temperature displays, alarm bell indicator, SERVICE indicator, and ICE
system indicator)

Error Codes .…………………..………... The code numbers accompanied by the letters “EC” that appear on the LCD dur-

ing diagnostic mode if the unit experienced specific problems related to electrical
signals supplied by electrical components.

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 dis­play 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 (Temperature Sensor) ..….. A resistor with which resistance changes as the temperature around it changes.

For electronic control system purposes, the microprocessor measures this resist­ance and displays it as a temperature reading at the LCD.

Variable Speed Compressor ….............. A compressor that runs at varying speeds depending on the load detected by the

compressor’s inverter.

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#3758412 - Revision B - December, 2006

Figure 3-1. Basic 700TCI-3 Electronic Control System Diagram

BASIC ELECTRONIC CONTROL SYSTEM

Input operations for the electronic control system are performed at the control panel (located at the top of the upper
compartment), with monitoring, regulating and controlling functions taking place at the control board (located directly
behind the control panel). Temperatures and possible problems with the unit are illuminated in the control panel at
the LCD. This page illustrates a basic 700 Series electronic control system (Model 700TCI-3 used, See Figure 3-1).
The entire electronic control system is described in greater detail on the following pages.

ALARM BELL

COND

FAN

R RRR

FILL TUBE

HEATER

RRRR

FRE CMPRTMNT
THERMISTOR

CONTROL BOARD

LCD

FRE EVAP
THERMISTOR

DEFROST
HEATER

L1

115 VOLTS

60 CYCLES

MICROPROCESSOR

CONTROL PANEL / MEMBRANE SWITCH

FREEZER

BOARD CONFIGURING
RESISTORS

REF EVAP

THERMISTOR

REF CMPRTMNT

THERMISTOR

NEUT

WARMERCOLDER

DEFROST MONITOR LINE

WARMERCOLDER

REFRIGERATOR

LIGHT

SWITCH

SOL. MONITOR LINE

DEFROST TERMINA T OR

ICE

ON/OFF

ON/OFF

DOOR AJAR
MONITOR LINE

WATER
SOLENOID

ICEMAKER

LIGHTS

ON/OFF

UNIT

FREEZER
COMP

FREEZER
EVAP FAN

REFRIG
COMP

REFRIG
EVAP FAN

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-4

#3758412 - Revision B - December, 2006

Figure 3-2. 700-3 Tall Unit Control Board Layout

Figure 3-3. 700-3 Tall Unit Control Board Summary Table (700TC/I-3 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 3-2 and 3-3)

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.

LCD (DISPLAY)

J5

PIN 1

PIN 1

BOARD CONFIGURING

RESISTORS

J6

PIN 1

J7

E7 E10 E6E2

PIN 1

J4

J3

CIRCUIT

DEF HTRE2

E7

FCOMP
E10
E6
J7-1 C FAN
J7-2
J7-3

J7-4
J7-5
J7-6
J7-7
J7-8
J4-1
J4-2
J4-3
J4-4
J4-5

LOW VOLTAGE THERMISTOR CIRCUITS

J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
J1-7
J1-8

L1

RCOMP

E FAN

IACC

LITES

ICE

NEU
F DR
R DR

EVAP FRZ

EVAP FRZ
EVAP REF
EVAP REF

REF
REF
FRZ
FRZ

PIN 1

J2

PIN 1

J1

PIN 1

DESCRIPTION

120 VOLT CIRCUITS
DEFROST HEATER
FRZ COMPRESSOR
POWER IN
REF COMPRESSOR

CONDENSER FAN
NOT USED

ICE MAKER ACC (FILL TUBE)
LIGHTS
ICE MAKER POWERS ICE MAKER
NOT USED
NOT USED(NO PIN)
NEUTRAL
DRAWER LIGHTS SENSE
DOOR LIGHTS SENSE
NOT USED(NO PIN)
DEF SENSOR
ICE MAKER VALVE SENSOR

FRZ EVAP
FRZ EVAP
REF EVAP
REF EVAP
REF COMPARTMENT
REF COMPARTMENT
FRZ COMPARTMENT
FRZ COMPARTMENT

CONTROL BOARD SUMMARY

FUNCTION COLOR

POWERS DEFROST CIRCUIT
POWERS FRZ COMPRESSOR (DRAWERS)
POWER INTO BOARD
POWERS REF COMPRESSOR (DOOR)
POWERS CONDENSER FAN

POWERS FILL TUBE HEATER AND ACCESSORIES
POWERS LIGHTS

NEUTRAL INTO BOARD
SENSES IF EITHER DRAWER OPEN
SENSES IF DOOR OPEN

SENSES WHEN DEF HEATER SHUTS OFF
SENSES WATER VALVE ACTIVATION

SENSES FRZ EVAP TEMP (DRAWERS)
SENSES FRZ EVAP TEMP (DRAWERS)
SENSES REF EVAP TEMP
SENSES REF EVAP TEMP
SENSES REF CABINET TEMP
SENSES REF CABINET TEMP

SENSES FRZ CABINET TEMP (DRAWERS)
SENSES FRZ CABINET TEMP (DRAWERS)

BLUE

PURPLE

BLACK

GRAY

WHITE/RED

WHITE/BLUE

YELLOW

PINK

WHITE

ORANGE
ORANGE

GRAY/WHITE

TAN

ORANGE/RED

BLUE/RED

ORANGE/YEL

BLUE/YELLOW

BLUE/WHITE

BLUE/WHITE
BLUE/BLACK
BLUE/BLACK

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

Electronic Control System

3-5

#3758412 - Revision B - December, 2006

UNIT

ICE

WARMER

COLDER

REFRIGERATOR

ON/OFF

ON/OFF

ON/OFF

WARMER

COLDER

FREEZER

ICE

SERVICE

OFF

CONTROL PANEL LAYOUT

Please note that an illustration of the 700TC/I-3 control panel is used in most cases for this section. (See Fig. 3-4)

Figure 3-4. 700-3 Tall Unit Control Panel Layout (700TC/I-3 Control Panel Shown)

WHEN IN OFF MODE, 115 VOLTS AC IS STILL PRESENT AT CONTROL BOARD!

Figure 3-5. 700-3 Tall Unit ON/OFF, Press UNIT ON/OFF Key

BASIC ELECTRONIC CONTROL INPUT OPERATIONS

Following are illustrations which show the basic input operations performed at the control panel. Switching the unit
ON and OFF, adjusting the set-point (temperature adjustments), switching the ice maker system ON and OFF, and
enabling and disabling the door ajar alarm feature will be explained. Please note that an illustration of the 700TC/I-3

control panel is used for most articles in this section, and in most cases Fahrenheit readings are shown.

Unit ON/OFF

All units are shipped in OFF Mode. When power is supplied to the unit, a trace of the word “OFF” is visible on the
LCD. By pressing and releasing the UNIT ON/OFF key (See Figure 3-5), power is allowed past the control board to
the rest of the unit. This is indicated by the unit’s lights energizing and LCD at the control panel illuminating with
temperature readings.

NOTE: Whenever the unit is switched OFF using the UNIT ON/OFF key, a trace of the word “OFF” will be visible on
the LCD as long as there is power to the unit.

UNIT

ON/OFF

KEY

DOOR / DRAWER

AJAR
ALARM
ON/OFF

KEY

REFRIGERATOR

SET-POINT

ADJUSTMENT

KEYS

(Upper Section on 700TR-3 & 736TR-3)

(Not present on 700TF/I-3)

FREEZER

SET-POINT

ADJUSTMENT

KEYS

(Lower Section on 700TR-3 & 736TR-3)

LCD

Liquid

Crystal

Display

ICEMAKER SYSTEM

ON/OFF KEY

(Not present on

700TR-3 & 736TR-3)

SERVICE

ICE

Jake Dog was here

OFF

FREEZER

COLDER

WARMER

COLDER

WARMER

REFRIGERATOR

ON/OFF

ICE

ON/OFF

ON/OFF

UNIT

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-6

#3758412 - Revision B - December, 2006

Adjusting Set-Point (Temperature Adjustment)

To adjust set-points, press WARMER or COLDER key on control panel in multiple key strokes

until desired set-point

is achieved (See Figure 3-6). One key stroke equals one degree change.

NOTE: The temperature range in a freezer zone is -5°F (-21°C) to +5°F (-15°C). The temperature range in a refrig­erator zone is +34°F (+1°C) to +45°F (+7°C).

NOTE: The initial stroke of the WARMER or COLDER key will change the previous set-point by one degree.

NOTE: The set-point will be displayed on the LCD for 10 seconds after the last key stroke. After the 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 degree per minute.

Figure 3-6. Adjusting Set-Point - Press WARMER or COLDER Key In Multiple Key Strokes

Icemaker System ON/OFF

When a unit first arrives in a home, the icemaker system is off. By pressing and releasing the ICE ON/OFF key,
power is allowed to the icemaker system and “ICE” appears on the LCD (See Figure 3-7). To switch the icemaker
system off, press and release the ICE ON/OFF key again and the “ICE” indicator disappears from the LCD, indicat­ing the icemaker system is of

f.

NOTE: When in “Sabbath Mode,” the icemaker system is deactivated. Sabbath Mode will be explained later.

NOTE: To allow ice to freeze fully and reduce effects of low water pressure, power to the icemaker system is inter-

rupted for 45 minutes after each ice harvest. This can be bypassed for service purposes by switching the icemaker
system OFF, then back ON with the ICE ON/OFF key.

Figure 3-7. Icemaker System ON/OFF - Press ICE ON/OFF Key

Ice system active if “ICE” is displayed

Door Ajar Alarm Feature ( ) ON/OFF

All units are equipped with a door ajar alarm feature. To enable the door ajar alarm, press and release the Alarm
Bell ON/OFF key on the control panel (See Figure 3-8). The bell indicator appears on the LCD indicating the alarm
feature is active. With the alarm enabled, the bell indicator will flash and an audible alarm will beep whenever the
door is left open for more then thirty seconds. To disable the door ajar alarm, press the Alarm Bell ON/OFF key
again and the bell indicator disappears from the LCD, indicating the alarm feature is inactive.

Door Ajar Alarm active if Bell is displayed

Figure 3-8. Switching Door Ajar Alarm ON or OFF - Press ( )ON/OFF Key

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

ICE

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

Electronic Control System

3-7

#3758412 - Revision B - December, 2006

UNIQUE ELECTRONIC CONTROL INPUT OPERATIONS

The following pages illustrate unique input operations performed at the control panel that you would not expect a
customer to perform every day. The input operations described are: Temperature Unit Selection Mode, Sabbath
Mode, Showroom Mode, Manual Zone Disable Mode and Manual Freezer Evaporator Defrost.

Temperature Units Selection Mode (Selecting Degrees Fahrenheit or Degrees Celsius Display)

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 minute after switching the unit ON.

To convert temperature units of measure from Fahrenheit (°F) to Celsius (°C) readings, press and hold the door ajar
alarm bell ON/OFF key and the UNIT ON/OFF key simultaneously for five (5) seconds, then release the keys (See
Figure 3-9). “ °C “ will appear on the LCD indicating that temperatures will now be displayed in Celsius units of
measure. To convert back to Fahrenheit units of measure, repeat the steps above (See Figure 3-10).

NOTE: Temperature Units Selection Mode will end ten (10) seconds after the last key stroke.

NOTE: Do not

press and hold the UNIT ON/OFF key first, that will simply switch the unit OFF.

Figure 3-10. Converting Back to Fahrenheit Units of Measure

(within ten (10) seconds of previous key stroke and/or within first minute after switching unit ON)

Press and Hold the Door Ajar Alarm Bell Key and The UNIT ON/OFF Keys

Figure 3-9. Converting to Celsius Units of Measure (within first minute after switching unit ON)

Press and Hold the Door Ajar Alarm Bell Key and The UNIT ON/OFF Keys for Five (5) Seconds

Press and hold for 5 seconds

Press and hold for 5 seconds

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-8

#3758412 - Revision B - December, 2006

Figure 3-12. Then Press and Hold UNIT ON/OFF Key for 10 Seconds

Showroom Mode

Showroom Mode was incorporated into the electronic control system so that units could be displayed in a showroom
setting. When in Showroom Mode, all cooling functions are disabled, but the lighting system remains active.

To initiate Showroom Mode, the unit must first be switched OFF using the UNIT ON/OFF key (See Figure 3-13),
then press and hold either pair of WARMER and COLDER keys, then the UNIT ON/OFF key, then release all three
keys (See Figure 3-14). To return the unit to normal operation, repeat the steps above.

NOTE: Always check set-points after returning unit to normal operation.

NOTE: 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 3-14. Then Press and Hold WARMER and COLDER Keys, Then the UNIT ON/OFF Key

Figure 3-13. To Enter (or Exit) Showroom Mode, Switch Unit OFF First

Press and hold for 10 seconds

Sabbath Mode

Sabbath Mode was incorporated into the electronic control system for the observance of certain religious days.
Initiating Sabbath Mode disables the LCD, lighting system, ice making system and door ajar alarm feature.

To initiate Sabbath Mode, the unit must first be switched OFF using the UNIT ON/OFF key (See Figure 3-11), then
press and hold the UNIT ON/OFF key until the LCD and lights switch OFF, approximately ten (10) seconds (See
Figure 3-12). To return to normal operation, press and release the UNIT ON/OFF key.

NOTE: During Sabbath Mode, the LCD is disabled and set-points cannot be changed.

NOTE: During Sabbath Mode, the compartment thermistors still control compressor operation, except when high

offset is reached, there is a random fifteen (15) to twenty-five (25) second delay before compressors are energized.

Figure 3-11. To Enter Sabbath Mode, Switch Unit OFF First

OFF

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

OFF

FREEZER

FREEZER

WARMERCOLDER

WARMERCOLDER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

REFRIGERATOR

ICE

ON/OFF

ICE

ON/OFF

ON/OFF

ON/OFF

UNIT

ON/OFF

UNIT

ON/OFF

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

Electronic Control System

3-9

#3758412 - Revision B - December, 2006

Manual Zone Disable Mode

Manual Zone Disable Mode allows a customer or Service Technician to switch one zone off for interior cleaning,
defrosting, or diagnostic purposes, while allowing the other zone to continue cooling.

To initiate Manual Zone Disable Mode, the unit must first be switched OFF using the UNIT ON/OFF key (See Figure
3-15), then press and hold the WARMER key for the zone being disabled, then the UNIT ON/OFF key, then release
both keys (See Figure 3-16). The LCD will display “- -” (double dashes) in place of temperature readings for the
zone chosen, indicating all cooling functions for that zone are disabled. To return the unit to normal operation,
repeat the steps above, or press UNIT ON/OFF key.

NOTE: Always check set-points after returning unit to normal operation.

Figure 3-16. Then Press and Hold WARMER Key for Zone Being Disabled,

Then the UNIT ON/OFF Key.

Figure 3-15. To Enter (or Exit) Manual Zone Disable Mode, Switch Unit OFF First

Indicating that all cooling functions
for that zone are disabled.

Manual Freezer Evaporator Defrost

Manual Freezer Evaporator Defrost was incorporated into the electronic control to assist in servicing and diagnos­tics.

To initiate manual freezer evaporator defrost, press and hold the ICE ON/OFF key for five (5) seconds, then release
the key. (See Figure 3-17).

NOTE: Manual Freezer Evaporator Defrost will not operate if unit is in Sabbath Mode.

Figure 3-17. Initiate Manual Freezer Evaporator Defrost - Press and Hold ICE ON/OFF key for 5 Seconds

Press and hold for 5 seconds

OFF

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

ICE

FREEZER

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-10

#3758412 - Revision B - December, 2006

FUNCTIONS OF THE ELECTRONIC CONTROL SYSTEM

The following pages explain monitoring, regulating and controlling functions of the electronic control system. In most
cases signal traces of a model 700TCI-3 wiring schematic are used to show current flow for functions being
explained.

Supply Power to the Lighting System

115 Volts AC are supplied to the lighting system through the control board when the unit is switched ON

by pressing

the UNIT ON/OFF key. With the doors open, the light switches allows power to the lights (See Figure 3-18).

NOTE: 115 Volt AC signal to the lights is monitored by the microprocessor to control the door ajar alarm feature.

NOTE: If in Sabbath Mode, th lighting system is disabled. Sabbath Mode will be covered later.

Figure 3-18. 700TC/I-3 Signal Trace Schematic of Lighting System

115 Volts are supplied
through J7 to lighting system
unless unit is switched OFF
or is in Sabbath Mode

NOTE:
Door Ajar Sense Lines

HIGH VOLTAGE

115 VOLTS

BLACK

WHITE

L1

60 CYCLES

NEUT

WHITE

M

J5

E2 E7 E10 E6

J3

J6

J7

J4

J1

J2

M

M

M

ORANGE
ORANGE

REFRIGERATOR

LIGHT SWITCH

ORANGE

ORANGE

FREEZER

LIGHT

SWITCHES

ORANGE

ORANGE

LIGHT

TERMINATOR

M

REFRIGERATOR

LIGHTS

FREEZER

LIGHTS

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

Electronic Control System

3-11

#3758412 - Revision B - December, 2006

Monitor, Regulate and Display Compartment Temperatures

The temperature signal from the compartment thermistor is 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 3-19). When the compartment temperature reaches high offset, the microprocessor supplies power to the
compressor and evaporator fan (See Figure 3-20). As the compressor and evaporator fan run, the compartment
temperature drops. When the compartment temperature reaches low offset, the microprocessor interrupts power to
the compressor and evaporator fan, cycling them off.

NOTE: If the average compartment temperature changes, the temperature displayed on the LCD will change by one
degree per minute.

Figure 3-19. Average Compartment Temperature Displayed

Compartments

calling for cooling

(Temp. above high offset)

Compressors and
evaporator fans
energized

Figure 3-20. 700TC/I-3 Signal Trace Schematic (High & Low Voltage) of Regulating Temperatures

HIGH VOLTAGE

J5

E2 E7 E10 E6

J3

J2

FREEZER

WARMERCOLDER

WARMERCOLDER

LOW VOLTAGE

DISPLAY

J5

0

PIN 1

PIN 1

J7

0

E2 E6E10E7

J3

PIN 1

J2

0

L1

BLACK

WHITE

J7

J4

J1

J6

GRAY

0

115 VOLTS
60 CYCLES

J1

0

PURPLE

J6

0

PIN 1

PIN 1

0

J4

PIN 1PIN 1

NEUT

MEMBRANE SWITCH

BLUE W/WHITE STRIPE
BLUE W/WHITE STRIPE

BLUE W/BLACK STRIPE
BLUE W/BLACK STRIPE

WHITE

REFRIGERATOR

FAN SWITCH

REFRIGERATOR

COMPRESSOR

M

REFRIGERATOR

OVERLOAD

PROTECTOR

FREEZER

OVERLOAD

PROTECTOR

FREEZER

FAN

PURPLE RED

SWITCHES

FREEZER

COMPRESSOR

M

REF CAB
THERMISTOR

FZR CAB
THERMISTOR

RED

REFRIGERATOR

REFRIGERATOR

FAN MOTOR

M

RUNNING

CAPACITOR

(WHEN USED)

STARTING

RELAY

RUNNING

CAPACITOR

(WHEN USED)

STARTING

RELAY

FREEZER

FAN MOTOR

M

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF

M

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-12

#3758412 - Revision B - December, 2006

Assist in Control of Variable Speed Compressors (700TF/I-3 Only)

As mentioned on the previous page, temperature signals from the thermistors in the compartment are monitored by
the microprocessor and then displayed on the LCD.

When the compartment reaches high-offset (calling for cooling), an “ON” signal is sent from the control board to the
compressor’s inverter. The inverter (which is supplied with AC power at all times) then provide high DC voltage (3­phase, 50 - 150 Hz), outputs to the compressor. The inverter in turn senses the compressor load. If the compressor
load is high, the speed command from the inverter will be for high speed compressor operation; if medium compres­sor load, speed command from the inverter will be for medium speed; if low compressor load, speed command from
the inverter will be for low speed. If/when the compartment reaches low-offset, an “OFF” signal is sent to the invert­er, which then cuts DC power to the compressor.

NOTE:

• The variable speed compressor, evaporator fan and the condenser fan will run a great majority of the time. This is
normal. These components will only cycle off during defrost and may also cycle off for short periods of time if the
ambient temperature is low enough.

• Initial speed command from an inverter to a compressor are always for High speed.

Figure 3-21. 700TF/I-3 Signal Trace Schematic of Variable Speed Compressor Operation

IN EXCESS OF 200 VOLTS MAY
BE PRESENT AT INVERTER
AND COMPRESSOR!

1. Compartment
temperature
monitored by
microprocessor

3. Inverter supplies

high DC voltage,
3-phase, 50 - 150
Hz signal, based
on compressor
load.

2. When cooling is called for,
115 Volts AC “ON” signal
supplied to compressor
inverter, evaporator fan
and condenser fan.

NOTE: Line voltage
supplied to inverter
at all times.

J5

E2 E7 E10 E6

J3

LOW VOLTAGE

J5

0

PIN 1

PIN 1

J7

0

E2 E6E10E7

J3

PIN 1

PIN 1

J2

0

0

HIGH VOLTAGE

J7

J1

J2

BLACK

WHITE

J4

115 VOLTS

L1

60 CYCLES

BLACK

J6

PURPLE

DISPLAY

PIN 1

J1

0

J4

0

NEUT

PIN 1

PIN 1

J6

0

CONDENSER

FAN MOTOR

MEMBRANE SWITCH

WHITE

M

FREEZER

PURPLE RED

FAN SWITCHES

BLUE W/BLACK STRIPE
BLUE W/BLACK STRIPE

VSPEED

CONTROL

BOX

FRZ CAB
THERMISTOR

M

LT. BLU E

FREEZER

FAN MOTOR

BROWN

BLACK

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

Electronic Control System

3-13

#3758412 - Revision B - December, 2006

Control Condenser Fan Run

In all models except the 700TF/I-3, the microprocessor senses the 115 volt output supplied to both compressors. If
either compressor is running, a signal is sent to the condenser fan relay on the control board to close, supplying
power to the condenser fan. If both compressors are off, the condenser fan is off. (See Figure 3-22)

NOTE: There is only one compressor on the model 700TF/I-3. The condenser fan cycles with this single compressor,
which along with the evaporator fan, will cycle off during defrost and may also cycle off for short periods of time if
the ambient temperature is low enough.

Figure 3-22. 700TC/I-3 Signal Trace Schematic (High Voltage) of Condenser Fan Operation

Power supplied to
condenser fan
motor if one or
both compressors
are running

HIGH VOLTAGE

115 VOLTS

J5

E2 E7 E10 E6

J3

60 CYCLES

BLACK

J7

J4

J1

J2

L1

WHITE

GRAY

J6

PURPLE

NEUT

WHITE

REFRIGERATOR

FAN SWITCH

REFRIGERATOR

COMPRESSOR

M

REFRIGERATOR

OVERLOAD

PROTECTOR

FREEZER

OVERLOAD

PROTECTOR

FREEZER

FAN

PURPLE RED

SWITCHES

FREEZER

COMPRESSOR

M

RED

REFRIGERATOR

FAN MOTOR

M

RUNNING

CAPACITOR

(WHEN USED)

STARTING

RELAY

RUNNING

CAPACITOR

(WHEN USED)

STARTING

RELAY

FREEZER

FAN MOTOR

M

WHITE/RED

CONDENSER
FAN MOTOR

M

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-14

#3758412 - Revision B - December, 2006

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

Temperature signals from refrigerator evaporator's thermistor’s are observed by the microprocessor. During off cycle
defrost, if a refrigerator zone temperature reaches high offset (calling for cooling) before evaporator temperature
rises to 38°F (3°C), no power will be supplied the the compressor. But, the the zone evaporator fan will switch ON.
Once the evaporator temperature reaches 38°F (3°C), normal cooling functions begin. (See Figure 3-23).

NOTE: If refrigerator compartment thermistor is faulty, compressor operation defaults to 20 minutes ON, 40 minutes
OFF cycling, EE appears in left of LCD, SERVICE will flash and Error Code 05 will be logged.

NOTE: 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.

NOTE: When in Sabbath
Mode, the refrigerator com­partment thermistor still con­trols compressor operation,
except there is a random 15
to 25 second delay before
the compressor is energized.

Figure 3-23. 700TC/I-3 Signal Trace Schematic (High & Low Voltage) of Refrigerator Off-Cycle Defrost

J6

J5

J3

E2E7E10

E6

J2

J1

J7

J4

J5

J7

J3

J2

E2

E6

E10

E7

J1

J4

LOW VOLTAGE

J6

HIGH VOLTAGE

NEUT

115 VOLTS

60 CYCLES

L1

REFRIGERATOR

OVERLOAD

PROTECTOR

REFRIGERATOR

COMPRESSOR

BLACK

WHITE

STARTING

RELAY

MEMBRANE SWITCH

DISPLAY

REF EVAP
THERMISTOR

BLUE W/YELLOW STRIPE

BLUE W/WHITE STRIPE

BLUE W/WHITE STRIPE

ORANGE W/YELLOW STRIPE

REF CAB
THERMISTOR

(WHEN USED)

M

M

M

M

M

PIN 1

PIN 1

PIN 1

0

PIN 1

0

0

0

PIN 1

PIN 1

PIN 1

0

0

0

REFRIGERATOR

FAN SWITCH

REFRIGERATOR

FAN MOTOR

RED

1. High offset temperature
reached, calling for
cooling

2. Evaporator temperature
below 38°F (3°C)

4. No power supplied to
refrigerator compressor
circuit

3. Evaporator fan energized

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

Electronic Control System

3-15

#3758412 - Revision B - December, 2006

Monitor and Control Freezer “Adaptive Defrost”

Initially the freezer compressor will cycle-run for twelve hours (twenty-four hours in the model 700TF/I-3), after which
the microprocessor sends the signal to the defrost relay on the control board to close. This supplies power to the
defrost heater, and the compressor is switched off (See Figure 3-24). With the “Adaptive Defrost” technique, the
length of time that the heater actually stays on to defrost the evaporator and satisfy the defrost terminator is
observed by the microprocessor. 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. This is an ongoing
process whereby the defrost time and the defrost interval will vary by unit use.

NOTE: A five (5) minute time delay/dwell follows all defrosts, except in the model 700TF/I-3 where the delay/dwell is
ten (10) minutes. The drain trough heater is energized during defrost and the delay/dwell period.

NOTE: The minimum defrost interval is six (6) hours; The maximum defrost interval is eighty (80) hours; the maxi­mum defrost duration is twenty-five (25) minutes.

NOTE: If the defrost sensing line is open, defrost operation defaults to 25 minute defrost time / 6 hour build time,
and Error Code 22 is logged. If the evaporator thermistor detects an under-heat or overheat situation at the same
time, Error Codes 20 or 23 is logged, respectively.

NOTE: During defrost, the displayed temperature is locked.

Figure 3-24. 700TC/I-3 Signal Trace Schematic (High Voltage) of Freezer Adaptive Defrost

Length of defrost time moni­tored by microprocessor via
defrost sense line

Drain trough
heater energized
during defrost and
delay/dwell period

HIGH VOLTAGE

115 VOLTS

BLACK

WHITE

L1

60 CYCLES

NEUT

WHITE

M

J5

E2 E7 E10 E6

J3

J6

J7

J4

J1

J2

M

M

M

GRAY/WHITE

BLUE

DEFROST

TERMINATOR

30-38 OHMS

155-175 OHMS

M

DEFROST

HEATER

DRAIN TROUGH
HEATER

Electronic Control System

Integrated

Integrated

(700-

(700-

3

3

TTALL)

ALL)

Series

Series

3-16

#3758412 - Revision B - December, 2006

Figure 3-25. 700TC/I-3 Signal Trace Schematic (High Voltage) of Compressor Electrical System

Figure 3-26. “SERVICE”, “40” or “50” and “EC” Flashing = Several Excessive Compressor Run Periods

length of compressor
run time is monitored

by microprocessor.

Monitor Compressor Run Duration, Displays If Service is Needed

In all models except the 700TF/I-3, the microprocessor observes the changing state of the compressor relays to
determine the length of compressor run time (See Figure 3-25). If a compressor runs 100% (Fre = 6 hours / Ref = 4
hours), an error code is logged (EC 40 / EC 50, respectively), and defrost is initiated, but SERVICE will not flash.

If several 100% run periods occur, and the compartment temperature does not fall to at least the set point / low off­set temperature average (and the door is not opened during the last run period), then SERVICE will flash along with
the error code (See Figure 3-26).

NOTE: To clear a flashing SERVICE and EC, the problem must be corrected, then switch the unit off then back on
and/or press the Bell ON/OFF key for 15 seconds. Failure to clear an error code will cause SERVICE to display
constant once Diagnostic Mode is initiated.

NOTE: If the unit is ever switched OFF then back ON, the compressor will not energize for at least 3 minutes. This
3 minute minimum OFF time is used to protect the compressor and its electricals.

HIGH VOLTAGE

115 VOLTS

J5

E2 E7 E10 E6

J3

60 CYCLES

L1

BLACK

WHITE

GRAY

J6

PURPLE

J7

J4

J1

J2

NEUT

WHITE

REFRIGERATOR

FAN SWITCH

REFRIGERATOR

COMPRESSOR

M

REFRIGERATOR

OVERLOAD

PROTECTOR

FREEZER

OVERLOAD

PROTECTOR

FREEZER

FAN

PURPLE RED

SWITCHES

FREEZER

COMPRESSOR

M

RED

REFRIGERATOR

FAN MOTOR

M

RUNNING

CAPACITOR

(WHEN USED)

STARTING

RELAY

RUNNING

CAPACITOR

(WHEN USED)

STARTING

RELAY

FREEZER

FAN MOTOR

M

SERVICE

FREEZER

M

WARMERCOLDER

WARMERCOLDER

REFRIGERATOR

ICE

ON/OFF

ON/OFF

UNIT

ON/OFF