Manitowoc Ice QDUAL Service Manual

Manitowoc

Q Model

QuietQube

Ice Machines

Technician’s

Handbook

This manual is updated as new information and models are

released. Visit our website for the latest manual.

America’s #1 Selling Ice Machine

Part Number 80-0099-9 6/11

www.manitowocice.com

®

Safety Notices

!

Warning

!

Caution

Important

As you work on Manitowoc equipment, be sure to pay
close attention to the safety notices in this handbook.
Disregarding the notices may lead to serious injury
and/or damage to the equipment.

Throughout this handbook, you will see the following
types of safety notices:

Text in a Warning box alerts you to a potential
personal injury situation. Be sure to read the
Warning statement before proceeding, and work
carefully.

Text in a Caution box alerts you to a situation in
which you could damage the equipment. Be sure
to read the Caution statement before proceeding,
and work carefully.

Procedural Notices

As you work on Manitowoc equipment, be sure to read
the procedural notices in this handbook. These notices
supply helpful information which may assist you as
you work.

Throughout this handbook, you will see the following
types of procedural notices:

Text in an Important box provides you with
information that may help you perform a
procedure more efficiently. Disregarding this
information will not cause damage or injury, but it
may slow you down as you work.

NOTE: T ext set off as a Note provides you with simple,

!

Caution

Important

! Warning

We reserve the right to make product

improvements at any time. S pecifications and

design are subject to change without notice.

but useful, extra information about the procedure you
are performing.

Read These Before Proceeding:

Proper installation, care and maintenance are
essential for maximum performance and trouble­free operation of your Manitowoc equipment. If
you encounter problems not covered by this
handbook, do not proceed, contact Manitowoc
Foodservice Group. We will be happy to provide
assistance.

Routine adjustments and maintenance
procedures outlined in this handbook are not
covered by the warranty.

PERSONAL INJURY POTENTIAL

Do not operate equipment that has been
misused, abused, neglected, damaged, or
altered/modified from that of original
manufactured specifications.

Table of Contents

Model Numbers

Model/Serial Number Location.............................. 2

Ice Machine Warranty Information

Owner Warranty Registration Card....................... 3

Warranty Coverage............ ... ................................ 4

General............................................................. 4

Parts................................................................. 4

Labor................................................................4

Exclusions ........................................................ 4

Authorized Warranty Service............................ 5

Service Calls..................................................... 5

Installation

Location of Ice Machine........................................ 6

Ice Machine Head Section 

Clearance Requirements ...................................... 6

Q0600C/Q0800C/Q1000C...............................6

SU1000/SerVend UC-300:............................... 6

Stacking Two Ice Machines on a 

Single Storage Bin ................................................7

Ice Deflector..........................................................7

Location of CVD

Condensing Unit Clearance Requirements...........8

Ice Machine Head Section Water 

Supply and Drains................................................. 9

Potable Water Supply.......................................9

Potable Water Inlet Lines................................. 9

Drain Connections..........................................10

Water cooled condenser water 

supply and drains................................................11

Condenser Water Supply ............................... 11

Water Cooled Condenser Lines .....................11

Condensing Unit Drain Connections .............. 12

®

Condensing Unit....................... 8

Electrical Requirements.......................................13

QuietQube® Ice Machines and 

CVD® Condensing Units................................13

3 Phase Scroll Compressor Rotation..............13

Refrigeration System Installation.........................15

Usage With Non-Manitowoc 

Condensing Units ...........................................15

Factory Equipment Refrigerant Amounts........ 16

Refrigeration Line Set Installation...................17

3 Phase Scroll Compressor Rotation 

CVD2075 Only ....................................................29

Condensing Unit Heat of Rejection .....................29

Operational Checks

General................................................................30

Water Level .................................. ... ....................30

Q0600C/Q0800C/Q1000C/QDUAL................ 30

Q1400C/SU1000C......................................... 31

Ice Thickness Check ...........................................32

Harvest Sequence Water Purge..........................33

Interior Cleaning and Sanitizing

AlphaSanÒ..........................................................36

Cleaning Procedure............................................. 37

Sanitizing Procedure ....................................... ... .39

Automatic Cleaning System (AuCS®) Accessory

........................................................................41

Removal of Parts for Cleaning or Sanitizing... 43

Removal from Service/Winterization

General................................................................63

CVD1476 Water Cooled Condensing Unit .......... 64

AuCS® Accessory................................... ............64

Component Identification

Ice Machine Head Section .................................. 65

Q0600C/Q0800C/Q1000C.............................65

SU1000C/SerVend UC-300 Dispenser .......... 6 7

Q1400C.......................................................... 68

QDUAL........................................................... 69

®

CVD

Condensing Unit .......................................70

CVD0675/CVD0875/CVD1075/CVD1475......70

CVD1476........................................................ 71

CVD1875/CVD2075 ....................................... 72

Ice Making Sequence of Operation

Q0600C/Q0800C/Q1000C/SU1000C ................. 73

Initial Start-Up or Start-Up After 

Automatic Shut-Off.........................................73

Freeze Sequence.... ... ....................................74

Harvest Sequence.......................................... 75

Automatic Shut-Off.........................................76

Q1400C............................................................... 79

Initial Start-Up or Start-Up After Automatic Shut-

Off................................................................... 79

Freeze Sequence.... ... ....................................79

Harvest Sequence.......................................... 80

QDUAL................................................................ 84

Initial Start-Up or Start-Up After Automatic Shut-

Off................................................................... 84

Freeze Sequence.... ... ....................................85

Harvest Sequence.......................................... 86

Electrical System

Component Specifications and Diagnostics Control

Board...................................................................91

Harvest/Safety Limit Light...............................91

Freeze Time Lock-In Feature......................... 91

Maximum Freeze Time...................................91

Safety Limits...................................................91

Three-Minute Delay........................................92

Inputs..............................................................92

Control Board Relays...................................... 92

Main Fuse............................................................95

Function..........................................................95

Specifications..................................................95

Check Procedure............................................95

Bin Switch...................................................... .. ....96

Function..........................................................96

Specifications..................................................96

Check Procedure............................................97

Ohm Test........................................................97

Water Curtain Removal Notes........................98

ICE/OFF/CLEAN Toggle Switch..........................99

Function..........................................................99

Specifications..................................................99

Check Procedure............................................99

Ice Thickness Probe (Harvest Initiation)............100

How the Probe Works...................................100

Ice Thickness Check..................................... 100

Ice Thickness Probe Diagnostics..................101

Diagnosing Ice Thickness Control Circuitry.. 102

Water Level Control Circuitry.............................105

Diagnosing an Ice Machine Head Section 

that Will Not Run ...............................................112

Diagnosing a Condensing Unit 

that Will Not Run ...............................................113

Compressor Electrical Diagnostics....................114

Diagnosing Start Components...........................116

Electrical Diagrams............................................117

Ice Machine Head Section............................117

Condensing Unit...........................................121

Refrigeration System

Refrigeration System Diagnostics....... ... .. ... ... ...123

General......................................................... 123

Refrigeration System Operation...................123

Ice Machine will Not Harvest Diagnostics ......... 127

Harvest Cycle Diagnostic List....................... 127

Ice Production Check........................................128

Installation/Visual Inspection Checklist......... 129

Water System Checklist............................... 130

Ice Formation Pattern...................................131

Evaporator Tubing Routing...........................131

Safety Limits................................................. 134

Analyzing Suction Pressure..........................142

Cool Vapor Valve.............................................. 146

Normal Operation.........................................146

Cool Vapor Valve Analysis........................... 147

Freeze Cycle Suction Line Temperature Analysis

.....................................................................148

Refrigeration Component Diagnostic Charts..... 150

General......................................................... 150

Procedure..................................................... 150

Final Analysis ............................................... 150

Refrigeration Component Diagnostic Charts..... 152

Single Expansion Valve – Q0600C/0800C/

Q1000C/SU1000C........................................ 152

Dual Expansion Valve – Q1400C/QDUAL.... 157

Pressure Control Specifications 

and Diagnostics.................................................160

Headmaster Control Valve ........................... 160

Water Regulating Valve................................170

Fan Cycle Control.........................................171

High Pressure Cutout (HPCO) Control......... 172

Low Pressure Cutout (LPCO) Control.......... 173

QuietQube

®

Tubing Schematics........................ 174

Q0600C/Q0800C/Q1000C...........................174

Q1400C/QDUALC........................................175

Cycle Times/24-Hour Ice Production/Refrigerant
Pressure Charts

Q0600C/CVD675 Series Remote Air Cooled.... 177

Q0800C/CVD875 Series Remote Air Cooled.... 178

Q1000C/CVD1075 Series Remote Air Cooled.. 179
SU1000C/SerVend UC-300 Dispenser/CVD1075

Remote Air Cooled............................................180

Q1400C/CVD1475 Series Remote Air Cooled.. 181

Q1400C/CVD1476 Remote water Cooled......... 182

QDUAL/CVD1875 Remote Air Cooled..............183

QDUAL/CVD2075 Remote air Cooled...............184

Refrigerant Recovery/Evacuation

System Contamination Cleanup........................188

General.........................................................188

Determining Severity of Contamination........ 188

Cleanup Procedure.......................................190

Replacing Pressure Controls Without Removing

Refrigerant Charge............................................193

Filter-Driers........................................................195

Liquid Line Filter-Drier ..................................195

Suction Line Filter.........................................196

Total System Refrigerant Charge......................197

Refrigerant Oil...................................................198

Refrigerant Definitions.......................................199

Refrigerant Reuse Policy...................................200

Model Numbers

Important

This manual covers the followin g mo de ls :

Ice Machine Head

Section

QR0670C
QD0672C

QY0674C

QR0870C
QD0872C

QY0874C

QR1070C
QD1072C

QY1074C

SU1024YC/SerVend

UC-300 Dispenser

QR1470C
QD1472C

QY1474C

QRDUALC
QDDUALC
QYDUALC

*For 3 phase electrical option: add the number “3” 

to end of model number (CVD10753).

CVD® Condensing

Unit*

CVD0675

CVD0875

CVD1075
CVD1285

CVD1075
CVD1375

CVD1475
CVD1476

CVD1875
CVD2075

The ice machine sequence of operation for
QuietQube

®

Ice Machines will differ. Verify the
correct sequence of operation is being followed for
the model you are working on.

–1–

!

Warning

Manitowoc QuietQube® Ice Machines require the ice
storage bin to incorporate an ice deflector, when
installing with non-Manitowoc ice storage systems or
Manitowoc F style bins.

Prior to using a non-Manitowoc ice storage system
with Manitowoc ice machines, contact the
manufacturer to assure their ice deflector is
compatible with Manitowoc ice machines.

MODEL/SERIAL NUMBER LOCATION

These numbers are required when requesting
information from your local Manitowoc Distributor,
service representative, or Manitowoc Ice, Inc. The
model and serial number are listed on the OWNER
WARRANTY REGISTRATION CARD. They are also
listed on the MODEL/SERIAL NUMBER DECAL
affixed to the ice machine.

–2–

Ice Machine Warranty Information

Important

OWNER WARRANTY REGISTRATION CARD

Warranty coverage begins the day the ice machine is
installed.

Complete and mail the OWNER WARRANTY
REGISTRATION CARD as soon as possible to
validate the installation date.

If the OWNER WARRANTY REGISTRA TION CARD is
not returned, Manitowoc will use the date of sale to the
Manitowoc Distributor as the first day of warranty
coverage for your new ice machine.

–3–

WARRANTY COVERAGE

Important

General

The following Warranty outline is provided for your
convenience. For a detailed explanation, read the
warranty bond shipped with each product.

Contact your local Manitowoc representative or
Manitowoc Ice, Inc. if you need further warranty
information.

This product is intended exclusively for commercial
application. No warranty is extended for personal,
family, or household purposes.

Parts

1. Manitowoc warrants the ice machine against
defects in materials and workmanship, under
normal use and service for three (3) years from the
date of original installation.

2. The evaporator and compressor are covered by an
additional two (2) year (five years total) warranty
beginning on the date of the original installation.

Labor

1. Labor required to repair or replace defective
components is covered for three (3) years from the
date of original installation.

2. The evaporator is covered by an additional 
two (2) year (five years total) labor warranty
beginning on the date of the original installation.

Exclusions

The following items are not included in the ice
machine’s warranty coverage:

1. Normal maintenance, adjustments and cleaning as
outlined in this manual.

2. Repairs due to unauthorized modifications to the
ice machine or use of non-standard parts without
prior written approval from Manitowoc Ice, Inc.

–4–

3. Damage caused by improper installation of the ice
machine, electrical supply, water supply or
drainage, or damage caused by floods, storms, or
other acts of God.

4. Premium labor rates due to holidays, overtime, etc.;
travel time; flat rate service call charges; mileage
and miscellaneous tools and material charges not
listed on the payment schedule. Additional labor
charges resulting from the inaccessibility of
equipment are also excluded.

5. Parts or assemblies subjected to misuse, abuse,
neglect or accidents.

6. Damage or problems caused by installation,
cleaning and/or maintenance procedures
inconsistent with the technical instructions provided
in this manual.

This product is intended exclusively for commercial
application. No warranty is extended for personal,
family, or household purposes.

Authorized Warranty Service

To comply with the provisions of the warranty, a
refrigeration service company qualified and authorized
by your Manitowoc Distributor, or a Contracted Service
Representative must perform the warranty repair.

NOTE: If the dealer you purchased the ice machine
from is not authorized to perform warranty service,
contact your Manitowoc Distributor or Manitowoc Ice,
Inc. for the name of the nearest authorized service
representative.

Service Calls

Normal maintenance, adjustments and cleaning as
outlined in this manual are not covered by the
warranty. If you have followed the procedures listed in
this manual, and the ice machine still does not perform
properly, call your Local Distributor or the Service
Department at Manitowoc Ice, Inc.

–5–

Installation

LOCATION OF ICE MACHINE

The location selected for the ice machine head section
must meet the following criteria. If any of these criteria
are not met, select another location.

 The location must be free of airborne and other

contaminants.

 The air temperature must be at least 35°F (1.6 °C),

but must not exceed 110°F (43.4°C).

 The location must not be near heat-generating

equipment or in direct sunlight.

ICE MACHINE HEAD SECTION CLEARANCE REQUIREMENTS

Q0600C/Q0800C/Q1000C
Top/Sides

There is no minimum clearance required, although
5 in. (127 mm) is recommended for efficient operation
and servicing only.

Back

1 in. (25 mm) required when routing electrical inlet,
water inlet and refrigeration tubing out of the top of the
unit.

5 in. (127 mm) required when routing all connections
out the back.

SU1000/SerVend UC-300:
Top

40 in. (100 mm) required for cleaning procedures and
servicing.

Back

12 in. (30.5cm) required for cleaning procedures and
servicing.

–6–

STACKING TWO ICE MACHINES ON A 
SINGLE STORAGE BIN

Q0600C/Q0800C/Q1000C Ice Machines:
A stacking kit is required for stacking two ice
machines. Installation instructions are supplied with
the stacking kit.

Q1400C/QDUAL Ice Machines: 
Q1400C and QDUAL ice machines cannot be stacked.
However two Q1400C/QDUAL ice machines can be
placed side by side on a 60 in. Manitowoc F style bin.

ICE DEFLECTOR

QDUAL ice machines mounted on an ice dispenser do
not require an ice deflector.

QDUAL ice machines mounted on an ice storage bin
(Manitowoc or non-Manitowoc) require the use of an
ice deflector. Refer to sales literature to determine the
proper kit for your application. This kit is necessary to
allow access to the shut-off valves during installation
and will improve access during future service.

An ice deflector is required for all ice machines
installed on a bin.

–7–

LOCATION OF CVD® CONDENSING UNIT

The location selected for the CVD® Condensing Unit
must meet the following criteria. If any of these criteria
are not met, select another location.

 The air temperature must be at least -20°F

(-28.9°C), but must not exceed 130°F (54.4°C)



-20°F (-28.9°C) to 120°F (54.4°C) QDUAL
CVD1875/CVD2075).

 CVD1476 only - The air temperature must be at

least 50°F (10°C) but must not exceed 110°F
(43°C).

 The location must not allow exhaust fan heat and/or

grease to enter the condenser.

 The location must not obstruct airflow through or

around the condensing unit.

CONDENSING UNIT CLEARANCE REQUIREMENTS

Top/Sides

There is no minimum clearance required, although
6 in. (152 mm) is recommended for efficient operation
and servicing only.

Front/Back

4 ft. (122 cm)

–8–

ICE MACHINE HEAD SECTION WATER 

Important

SUPPLY AND DRAINS
Potable Water Supply

Local water conditions may require treatment of the
water to inhibit scale formation, filter sediment, and
remove chlorine odor and taste.

If you are installing a Manitowoc water filter system,
refer to the Installation Instructions supplied with the
filter system for ice making water inlet connections.

Potable Water Inlet Lines

Follow these guidelines to install water inlet lines:
 Do not connect the ice machine to a hot water

supply. Be sure all hot water restrictors installed for
other equipment are working. (Check valves on sink
faucets, dishwashers, etc.)

 If water pressure exceeds the maximum

recommended pressure obtain a water pressure
regulator from your Manitowoc Distributor.

Float Valve - 80 psi (551.5 kPa)
Water Inlet Valve - 90 psi (620.4 kPA)

 Install a water shut-off valve for ice making potable

water.

 Insulate water inlet lines to prevent condensation.

–9–

Drain Connections

Follow these guidelines when installing drain lines to
prevent drain water from flowing back into the ice
machine and storage bin:

 Drain lines must have a 1.5 in. drop per 5 ft. of run

(2.5 cm per meter), and must not create traps.

 The floor drain must be large enough to

accommodate drainage from all drains.

 Run separate bin and ice machine drain lines.

Insulate them to prevent condensation.

 Vent the bin and ice machine drain to the

atmosphere.

 Drains must have a union or other suitable means of

disconnection from the ice machine when servicing
is required.

 The SU1024YC is designed for installation on a

SerVend UC-300 dispenser only. Refer to the
SerVend UC-300 Installation, Use and Care Manual
for additional drain requirements.

–10–

WATER COOLED CONDENSER WATER 

!

Warning

SUPPLY AND DRAINS
Condenser Water Supply

Local water conditions may require treatment of the
water to inhibit scale formation to filter sediment.

Water Cooled Condenser Lines

Follow these guidelines to install water lines:
 Contact your distributor if your water pressure is

greater than 150 psi (1034kPA). A special order
condensing unit is available that allows water
pressure up to 350 psi (2413 kPA).

 Install a shutoff valve (inlet and outlet on cooling

tower or closed loop circuits) to allow isolation of the
water system.

 Water entering the condenser must not exceed 90°F

(32.2°C).

 Water flow through the condenser must not exceed

5 gallons (19 liters) per minute.

 Allow for a pressure drop of 8 psi (55 kPA) between

the condenser water inlet and outlet.

 Water exiting the condenser must not exceed 110°F

(43.3°C)

Water pressure at the condenser cannot exceed 150
psig (1034kPA) with the standard water regulating
valve. Contact your distributor if your water pressure
is greater than 150 psig (1034 kPA). A special order
condensing unit is available that allows water
pressure up to 350 psig (2413 kPA).

.

–11–

Condensing Unit Drain Connections

The condensing unit drain is provided to remove any
condensate produced by the suction accumulator.
Condensate amounts will vary depending on
temperature and humidity.

 The condensing unit must be level front to back and

side to side to allow the condensate to drain.

 Drain lines must have1.5-inch drop per 5 feet of run

(2.5 cm per meter), and must not create traps.

 Drain termination must meet applicable codes.

–12–

ELECTRICAL REQUIREMENTS

Important

QuietQube® Ice Machines and 
CVD® Condensing Units

Ice Machine Head Section

Voltage

Phase

Cycle

Max. Fuse/

Circuit

Breaker

Total

Amps

Q0600C
Q0800C
Q1000C

SU1000C

115/1/60

230/1/50

15 amp
15 amp

1.1

0.6

Q1400C

QDUAL

The QuietQube® Ice Machine Head Section and

®

CVD

Condensing Unit are wired independently

from each other.

3 Phase Scroll Compressor Rotation

CVD2075 3 PHASE ONLY
A trained and qualified technician must verify

compressor rotation at equipment startup or
compressor warranty will be void. Incorrect rotation of
a scroll compressor can be identified by:

 Noisy compressor operation
 Elevated suction pressure
 Low discharge pressure
 Compressor trips on overload protector

To change compressor rotation, reverse (exchange
locations) any two incoming power supply leads.

–13–

CVD0675

!

Caution

CVD0875

CVD1075

CVD1475

CVD1476

CVD1875

CVD2075

CVD® Condensing Unit

Voltage

Phase

Cycle

208-230/1/60
208-230/3/60

230/1/50

208-230/1/60
208-230/3/60

230/1/50

208-230/1/60
208-230/3/60

230/1/50

208-230/1/60
208-230/3/60

230/1/50

208-230/1/60
208-230/3/60

208-230/1/60
208-230/3/60

230/1/50

208-230/1/60
208-230/3/60

230/1/50

Max. Fuse/

Circuit

Breaker

15 amp
15 amp
15 amp

20 amp
15 amp
20 amp

25 amp
20 amp
25 amp

35 amp
25 amp
35 amp

30 amp
20 amp

40 amp
30 amp
40 amp

50 amp
40 amp
50 amp

Min.

Circuit

Amps

9.6

7.3

9.0

11.7

8.2

11.3

15.6

10.6

13.8

19.6

14.1

19.8

15.3

10.8

21.1

11.0

23.2

27.1

19.9

29.9

Scroll Compressor Rotation

(CVD2075 3 Phase Only)

Correct compressor rotation must be verified at
start-up. Incorrect rotation will result in increased
compressor noise and higher than normal suction
pressure. T o change rotation, reverse two lead wires
on the incoming power supply. Compressor must be
checked by a qualified technician or compressor
warranty will be void.

–14–

REFRIGERATION SYSTEM INSTALLATION

®

QuietQube® Ice

Machine

CVD

Condensing

Unit

Line Set

Q1000C

SU1000C/ UC-300

Q1400C

Q0600C
Q0800C

QDUAL

Line Set

RC 20/30/50

RC 21/31/51

RC 22/32/52

Suction

(19.1 mm)

(15.9 mm)

(22.2 mm)

Line

3/4 in.

5/8 in.

7/8 in.

CVD1075
CVD1475
CVD1476

CVD0675
CVD0875

CVD1875
CVD2075

Liquid

Line

1/2in.

(12.7 mm)

3/8 in.

(9.5 mm)

5/8 in.

(15.9 mm)

RC-20
RC-30
RC-50

RC-21
RC-31
RC-51

RC-22
RC-32
RC-52

Insulation

Thickness

Suction

Line

1/2"

(13 mm)

Liquid Line

1/4" (7 mm)

Suction

Line

3/4"

(19 mm)

Liquid Line

1/4" (7 mm)

Usage With Non-Manitowoc Condensing Units

Manitowoc CVD® Condensing Units are specifically
designed for usage with a QuietQube
Head Section. Standard condensing units will not
operate a QuietQube

®

Ice Machine Head Section.

–15–

®

Ice Machine

Factory Equipment Refrigerant Amounts

!

Caution

!

Caution

ICE MACHINE HEAD SECTION

Q0600C/Q0800C/Q1000C/SU1000C/Q1400C

Each ice machine head section ships from the factory
with an R-404A refrigerant charge appropriate for the
entire system operation. The serial tag on the ice
machine indicates the refrigerant charge. The
refrigerant charge is sufficient to operate the ice
machine in ambient temperatures between -20°F
(-28.9°C) and 130°F (54.4°C), (CVD1476, 50°F to
110°F, 10°C to 43°C) with line set lengths of up to
100 ft. (30.5 m).

QDUAL 
Each QDUAL ice machine head section ships from the
factory with an R-404A refrigerant charge appropriate
for installations with up to 50" of refrigerant tubing. The
serial tag on the ice machine indicates the refrigerant
charge. For line set runs longer than 50 ft., 1 lb. of
additional refrigerant must be added for each 10 ft. of
line set run. The receiver is designed to hold a charge
sufficient to operate the ice machine in ambient
temperatures between -20°F (-28.9°C) and 120°F
(49°C), with line set lengths of up to 100 feet (15 m)

Never add more than nameplate charge to the
refrigeration system for any application.

The 60-month compressor warranty (including the
36-month labor replacement warranty) will not apply
if the Manitowoc Ice Machine and Manitowoc CVD®
Condensing Unit are not installed according to
specifications. This warranty also will not apply if the
refrigeration system is modified with a condenser,
heat reclaim device, or other parts or assemblies not
manufactured by Manitowoc Ice, Inc.

–16–

!

Warning

Potential Personal Injury Situation

!

Caution

The ice machine head section contains the
refrigerant charge. Installation and brazing of the line
sets must be performed by a properly trained
refrigeration technician aware of the dangers of

dealing with refrigerant charged equipment.

Refrigeration Line Set Installation

Refrigeration line set installation consists of vertical
and horizontal line set distances between the ice
machine and the condensing unit. The following
guidelines, drawings and calculation methods must be
followed to assure proper oil return and CVD

®

Condensing Unit/ice Machine operation.
Step 1. Prior to installation of the ice machine and

®

Condensing Unit be sure that the distance

CVD
between them is within the line set routing guidelines
outlined in this manual.

Step 2. Properly route refrigeration tubing between the
Ice Machine Head Section and the CVD

®

Condensing

Unit.
For a roof/wall penetration, cut a 3-in. (76.2 mm)

circular hole in the wall or roof for routing of
refrigeration tubing, as required. A qualified person
must perform all roof penetrations.

A. LINE SET LENGTH

QuietQube® Ice Machines will not function with line
sets greater than 100 ft. (30.5 m). Do not attempt to
go beyond this distance and add refrigerant charge
to compensate!

–17–

B. LINE SET RISE OR DROP

SV1751

35 FT. (10.7 M)

MAXIMUM

DISTANCE

SV1750

15 FT . (4.5 M)

MAXIMUM
DISTANCE

35 ft. (10.7 m) Rise: The maximum distance the CVD®

Condensing Unit can be above the ice machine.

15 ft. (4.5 m) Drop: The maximum distance the CVD®
Condensing Unit can be below the ice machine.

–18–

C. SUCTION LINE OIL TRAPS

!

Caution

SV1751

21 FT. OR

MORE RISE

ADDITIONAL

TRAP KIT

REQUIRED.

Do not form unwanted traps in refrigeration lines.
Never coil excess refrigeration tubing.

0 to 20 ft. (0 to 6.1 m) Rise: The ice machine head
section has one oil trap built in which allows for a
maximum condenser rise of 20 ft. (6.1 m) without
additional traps in the suction line.

21 to 35 ft. (6.4 to 10.7 m) Rise: The suction line
requires an additional oil trap (“S” type) to be installed.
Install the trap as close as possible to midpoint
between the ice machine head section and CVD

®

Condensing Unit. S-Trap Kits are available from
Manitowoc (refer to chart).

–19–

Manitowoc S-Trap Kit

!

Caution

SV1760

Model S-Trap Kit # Tubing Size

Q0600C
Q0800C

Q1000C

SU1000C

Q1400C

QDUAL K00164

SERVICE LOOP
A service loop in the line set permits easy access to

the ice machine for cleaning and service.
 The supplied service loop is an installation

requirement. Excess tubing must allow 180 degree
rotation of the ice machine.

 A service loop is not considered an oil trap.
 The service loop is not included when calculating

the length, rise or drop of the tubing run.

 Do not use hard rigid copper for the service loop.

K00172

K00166

5/8 in.

(15.9 mm)

3/4 in.

(19.1 mm)

7/8 in.

(22.2 mm)

If a line set has a rise followed by a drop, another
rise cannot be made. Likewise, if a line set has a
drop followed by a rise, another drop cannot be
made.

–20–

Step 3. When the line set requires shortening or

!

Caution

!

Warning

SV1757

VALVES MUST REMAIN CLOSED

AND BE PROTECTED FROM

HEAT WHEN BRAZING

(WRAP WITH WET RAG).

Q0600C/Q0800C/Q1000C SHOWN

lengthening, do so before connecting the line set to
the ice machine head section or the CVD

®

Condensing

Unit.

Do not form unwanted traps in refrigeration lines.
Never coil excess refrigeration tubing.

Step 4. To prevent oxidation of the copper, purge line
set and condensing unit with dry nitrogen while
brazing. .

The ice machine head section contains refrigerant
charge. The ice machine head section contains
three (3) refrigeration valves that must remain
closed until proper installation of the line sets is
completed.

CONNECT THE LINE SET TO THE ICE MACHINE
HEAD SECTION

The line set shut-off valves at the back of the ice
machine must remain closed and be protected from
heat during the brazing process. Wrap the valves in a
wet rag or other type of heat sink prior to brazing. Cool
braze joint with water immediately after brazing to
prevent heat migration to the valve.

–21–

CONNECT THE LINE SET TO THE CVD®

!

Warning

PT1284A

MINIMIZE THE TIME THE REFRIGERATION

SYSTEM IS EXPOSED TO THE ATMOSPHERE

(15 MINUTES MAXIMUM).

SUCTION

FILTER

SUCTION LINE

CONDENSING UNIT

The condensing unit ships from the factory
pressurized with a 50/50 mixture of nitrogen/helium.
Bleed off pressure from both suction and liquid line
access ports prior to cutting into refrigeration lines.

The compressor oil rapidly absorbs moisture. Be
prepared to complete line set installation and start
your evacuation process in order to minimize the time
the compressor is exposed to the atmosphere.
(Maximum amount of time the system can be exposed
to the atmosphere is 15 minutes.)

The line set can be routed for entry through the front or
left side of the condensing unit.

 Remove knockout for preferred location.
 Insert supplied plastic bushings in knockout holes to

prevent tubing from contacting sheet metal.

 Use the supplied 90° elbows to route tu bing.
 Cut the tubing ends of the suction and liquid lines

and braze line sets to the condensing unit.

–22–

Step 5. Schrader valve core removal tools that allow

Liquid Line

Suction Line

SV3077

SV1757

CONNECT VACUUM
PUMP TO LINE SET
SHUT-OFF VALVES.

for removal and installation of the valve cores without
removing manifold gauge set hoses are recommended
to decrease the evacuation time.

Leave the line set shut-off valves closed (front seated).
Pressure test the line sets and CVD

®

Condensing Unit
with 150 psig of dry nitrogen. Add nitrogen at the line
set shut-off valves located at the back of the ice
machine. Complete the pressure test, verify no leaks
are present and remove the nitrogen from the system
before connecting the vacuum pump. Connect a
vacuum pump to both of the line set shut-off valves
located at the back of the ice machine head section.
Evacuate to 250 microns (or less). To completely
evacuate the CVD

®

Condensing Unit, continue the
evacuation for 30 minutes after reaching the
500-micron point.

–23–

If required, the line set and condensing unit can be

PT1284

ALTERNATE CONNECTIONS AT

CONDENSING UNIT SCHRADER VAL VES

evacuated from the schrader valves located in the
CVD® Condensing Unit. Schrader valve core removal
tools (that allow for putting the cores back in without
removing vacuum pump hoses) must be used if
evacuating from the condensing unit side.

Isolate the vacuum pump from the line set shut-off
valves and/or condensing unit access ports prior to
proceeding.

–24–

Step 6. The suction line, liquid line and receiver

SV1762

USE ALLEN WRENCH TO OPEN

(TURN COUNTERCLOCKWISE)

LIQUID AND SUCTION LINE

SHUT-OFF VALVES.

Q0600C/Q0800C/Q1000C

SV1769c

USE ALLEN WRENCH

TO OPEN (TURN

COUNTERCLOCKWISE)

LIQUID AND SUCTION

LINE SHUT-OFF

VALVES.

Q1400C/QDUAL

SUCTION AND LIQUID LINE

SHUT-OFF VALVES

service valves are closed during shipment and
installation.

Open the valves prior to starting the ice machine.
A. Slowly backseat (open – turn counterclockwise) the

suction line shut-off valve.

B. Slowly backseat (open – turn counterclockwise) the

liquid line shut-off valve.

C. Slowly backseat (open-turn counterclockwise) the

receiver service valve.

–25–

Important

All refrigeration valve caps must be reinstalled to

SV1756

TURN

COUNTERCLOCKWISE

TO OPEN.

RECEIVER SERVICE

VALVE CAP

(TURN COUNTERCLOCKWISE

TO REMOVE.)

RECEIVER SERVICE VALVE

prevent future refrigeration leaks.

Verify O-rings in schrader valve caps are intact and
reinstall on shut-off valves to prevent refrigerant
leakage. Replace shut-off valve access caps and
torque to the following specifications.

Torque Values

Stem 18-20 ft. lbs.
Caps 12-15 ft. lbs.

Schraeder Core 1.5-3 in. lbs.

Replace cap on receiver service valve and tighten.
There is a liquid line solenoid valve at the outlet of the
receiver; refrigerant will not flow to the condensing unit
until the ice machine head section is started. Connect
power to both the ice machine head section and the

®

CVD

Condensing Unit. Place the ice machine toggle
switch into the ICE position; this will allow refrigerant
to enter the line set and condensing unit.

Step 7. Leak check the new line set connections at the
ice machine head section, condensing unit and S-trap
as well as all factory joints throughout the entire
system. Disconnect power to the CVD
Unit. Place the ICE/OFF/CLEAN toggle switch in the
ICE position. This allows the low side and high side

–26–

®

Condensing

pressures to equalize. Place the ICE/OFF/CLEAN

Important

toggle switch in the OFF position. Connect power to
the CVD

®

Condensing Unit and allow system to pump

down.
Step 8. To prevent condensation, the entire suction

line including the shut-off valve must be insulated. All
insulation must be airtight and sealed at both ends.

The following insulation requirements prevent
condensation at 90°F (32.2°C) ambient 90% Relative
Humidity. If higher humidity is expected, increase
insulation thickness.

The entire suction line set, including the suction
service valve located on the back of the ice machine,
requires a minimum of 3/4 in. (12.7 mm) wall thickness
insulation.

The entire liquid line set requires a minimum of 
1/4 in. (6.4 mm) wall thickness insulation.

To prevent condensation, the entire suction line
including the shut-off valve must be insulated. All
insulation must be airtight and sealed at both ends.

This requires a minimum of 3/4 in. (12.7 mm)
insulation wall thickness with conditions at or below
90% humidity and 90° ambient. When higher
humidity will be experienced, insulation wall
thickness will need to be increased.

–27–

SUCTION SHUT-OFF VALVE INSULATION

PREFORMED

INSULATION

TIGHTEN VALVE CAPS

TO SPECIFICATIONS.

PLACE TAB BETWEEN

VALVE BODY AND PANEL.

FOLD INSULATION OVER

RIGHT SIDE OF VALVE

AND SECURE WITH
ELECTRICAL TAPE.

The preformed suction shut-off valve insulation is
located in the plastic bag taped to the water curtain.

A. Verify valve and schrader caps are tightened to

specifications (see step 6).

B. Place insulation over schrader valve cap and left

side of valve. Position the tab between the
mounting bracket and rear panel.

C. Fold insulation and hold against right hand side of

valve while securing with electrical tape. Seal the
line set insulation to the shut-off valve insulation
with electrical tape.

–28–

3 PHASE SCROLL COMPRESSOR ROTATION CVD2075 ONLY

A trained and qualified technician must verify
compressor rotation at equipment startup or
compressor warranty will be void. Incorrect rotation of
a scroll compressor can be identified by:

 Noisy compressor operation
 Elevated suction pressure
 Low discharge pressure
 Compressor trips on overload protector

To change compressor rotation, reverse (exchange
locations) any two incoming power supply leads.

CONDENSING UNIT HEAT OF REJECTION

Series

Condensing

Unit

Heat of Rejection*

A/C** Peak

CVD0675 9,000 13,900
CVD0875 12,400 19,500
CVD1075 16,000 24,700
CVD1475

CVD1476

24,000 35,000

CVD1875 28,000 42,000
CVD2075 39,000 53,000

**B.T.U./Hour

**Because the heat of rejection varies during the ice

making cycle, the figure shown is an average.

Ice machines, like other refrigeration equipment, reject
heat through the condenser. It is necessary to know
the amount of heat rejected by an ice machine when
determining the additional BTUH requirements for air
conditioning equipment.

 Self-contained air-cooled ice machines add the total

BTUH load to a conditioned space.

 QuietQube® Ice Machine head sections add an

insignificant amount of load to a conditioned space.

–29–

Operational Checks

WATER LEVEL PROBE

WATER LEVEL

SENSOR PROBE

WATER

PUMP

WATER LEVEL

ABOVE HOUSING

GENERAL

Your Manitowoc ice machine was factory-operated
and adjusted before shipment. Normally, a newly
installed ice machine does not require any adjustment.

To ensure proper operation, always perform these
Operational Checks when starting the ice machine:

 For the First Time
 After a Prolonged Out-of-Service Period
 After Cleaning and Sanitizing

Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty.

WATER LEVEL
Q0600C/Q0800C/Q1000C/QDUAL

The water level sensor is set to maintain the proper
water level above the water pump housing. The water
level is not adjustable.

If the water level is incorrect, check the water level
probe for damage (probe bent, etc.). Clean, repair or
replace the probe as necessary.

–30–

Q1400C/SU1000C

WATER

LEVEL

1. Check the water level while the ice machine is in
the Clean mode and the water pump is running.
The correct water level above the water pump
impeller housing is:

 Q1400C - 1/8-1/2 in. (3-12.5 mm)
 SU1000C - 1/8-1/4 in. (3-6.35 mm)

2. The float valve is factory-set for the proper water
level. If adjustments are necessary:

A. Loosen the two screws on the float valve

bracket.

B. Raise or lower the float valve assembly as

necessary, then tighten the screws.

If further adjustment is required, carefully bend the
float arm to achieve the correct water level.

–31–

ICE THICKNESS CHECK

SV3113

ADJUSTING

SCREW

1/8 IN. ICE BRIDGE

THICKNESS

ICE THICKNESS ADJUSTMENT

1/8” ICE BRIDGE THICKNESS

After a Harvest cycle, inspect the ice cubes in the ice
storage bin. The ice thickness probe is set to maintain
an ice bridge of 1/8 in. (3.2 mm). If an adjustment is
needed, follow the steps below.

1. Turn the ice thickness probe adjustment screw
clockwise for a thicker ice bridge, or
counterclockwise for a thinner ice bridge.

2. Make sure the ice thickness probe wire and bracket
do not restrict movement of the probe.

–32–

HARVEST SEQUENCE WATER PURGE

Important

15

30

45

SV1208

CONTROL

BOARD

WATER PURGE

ADJUSTMENT

Q0600C/Q0800C/Q1000C/SU1000C/QDUAL

The Harvest sequence water purge adjustment may
only be used when the ice machine is hooked up to
special water systems, such as a de-ionized water
treatment system.

The Harvest sequence water purge is factory-set at
45 seconds. A shorter purge setting (with standard
water supplies such as city water) is not recommended.
This can increase water system cleaning and
sanitizing requirements.

 The Harvest sequence water purge may be set to

15, 30, or 45 seconds.

 During the Harvest sequence water purge, the water

fill valve energizes and de-energizes by time. The
water purge must be at the factory setting of
45

seconds for the water fill valve to energize during
the last 15 seconds of the water purge. If it is set to
less than 45 seconds, the water fill valve will not
energize during the water purge.

–33–

Interior Cleaning and Sanitizing

!

Caution

!

Caution

!

Warning

NOTE: Clean and sanitize the ice machine every six

months for efficient operation. If the ice machine
requires more frequent cleaning and sanitizing,
consult a water care professional to test the water
quality and recommend appropriate water treatment or
installation of the AuCS
Accessory. If required, an extremely dirty ice machine
may be taken apart for cleaning and sanitizing.

Use only Manitowoc approved Ice Machine Cleaner
(part number 94-0546-3) and Sanitizer (part number
94-0565-3). It is a violation of Federal law to use
these solutions in a manner inconsistent with their
labeling. Read and understand all labels printed on
bottles before use.

Do not mix Ice Machine Cleaner and Sanitizer
solutions together. It is a violation of Federal law to
use these solutions in a manner inconsistent with
their labeling.

Wear rubber gloves and safety goggles (and/or face
shield) when handling Ice Machine Cleaner or
Sanitizer.

®

(Automatic Cleaning System)

NOTE: The SU1024YC is designed for
installation on a SerVend UC-300 dispenser
only. Refer to the SerVend UC-300
Installation, Use and Care Manual fo r
dispenser cleaning/sanitizing procedures.

–34–

Manitowoc’s Patented Cleaning or Sanitizing
Technology

Manitowoc ice machines include technology that
allows the initiation and completion of a cleaning or
sanitizing cycle at the flip of a switch. This cycle will
permit cleaning or sanitizing of all surfaces that come
in contact with the water distribution system. Periodic
maintenance must be performed that includes
sanitizing the bin (or dispenser) and adjacent surface
areas, which cannot be contacted by the water
distribution system.

This technology will also allow initiation and
completion of a Clean or Sanitize cycle, after which the
ice machine automatically starts ice making again.
Refer to the cleaning or sanitizing procedure for
complete details.

The AuCS

®

Accessory can be set to automatically
start and finish a Clean or Sanitize cycle every 2, 4, or
12 weeks. This accessory monitors ice-making cycles
and initiates a cleaning or sanitizing cycle
automatically. After completion of the cleaning or
sanitizing cycle, the ice machine returns to ice making
automatically. Refer to Automatic Cleaning System

®

(AuCS

) Accessory for further details.

–35–

ALPHASAN

The goal of AlphaSan is to keep the plastic surfaces
of an ice machine cleaner, by reducing or delaying the
formation of biofilm. The active ingredient in
AlphaSan
ions (Ag+). AlphaSan
an ion exchange mechanism. When AlphaSan
compounded directly into a plastic part, a controlled
release of silver ions from the surface is regulated to
maintain an effective concentration at or near the
surface of the plastic ice machine part.

AlphaSan’s
release of silver not only protects against undesired
discoloration of the plastic, but also will last the life of
the plastic part. Although AlphaSan helps prevent
biofilm build up it does not eliminate the need for
periodic cleaning and maintenance. AlphaSan
no adverse effect on the taste of the ice or beverage.

 is the element silver in the form of silver

 slowly releases silver ions via

 is

 unique ability to effectively control the

 has

–36–

CLEANING PROCEDURE

!

Caution

Ice machine cleaner is used to remove lime scale or
other mineral deposits. It is not used to remove algae
or slime. Refer to “Sanitizing Procedure” on page 39
for removal of algae and slime. To initiate a cleaning
cycle using Manitowoc’s Pate nt ed Cl e an i n g
Technology, use the following procedure.

Step 1. Set the toggle switch to the OFF position after
ice falls from the evaporator at the end of a Harvest
cycle. Or, set the switch to the OFF position and allow
the ice to melt off the evaporator.

Never use anything to force ice from the evaporator.
Damage may result.

Step 2. To start a cleaning cycle, move the toggle
switch to the CLEAN position. The water will flow
through the water dump valve and down the drain. The
Clean light* will turn on to indicate the ice machine is
in the cleaning mode.

Step 3. Wait about one minute or until water starts to
flow over the evaporator.

Step 4. Add the proper amount of Manitowoc Ice
Machine Cleaner to the water trough.

QuietQube® Models Amount of Cleaner

Q0600C/Q0800C/

SU1000C/Q1400C

Q1000C/QDUAL 9 ounces (270 ml)

5 ounces (150 ml)

*The Q1400C ice machine control board does not energize a

Clean light.

–37–

Step 5. The ice machine will automatically time out a
ten-minute cleaning cycle, followed by six Rinse
cycles, and then stop. The Clean light* will turn off to
indicate the cleaning mode is completed. This entire
cycle lasts approximately 25 minutes.

NOTE: Periodic cleaning must be performed on
adjacent surface areas not contacted by the water
distribution system.

Step 6. When the cleaning process stops, move the
toggle switch to the OFF position. Refer to “Sanitizing
Procedure” on page 39.

Step 7.**

A. The ice machine may be set to start and finish a

cleaning procedure, and then automatically start ice
making again.

B. Wait about one minute into the cleaning cycle (until

water starts to flow over the evaporator), then move
the switch from CLEAN to ICE position.

C. When the cleaning cycle is completed, the Clean

light will turn off and an ice making sequence will
start automatically.

NOTE: After the toggle switch is moved to the ICE
position, opening the curtain (bin switch) will interrupt
the cleaning sequence. The sequence will resume
from the point of interruption when the curtain (bin
switch) closes.

NOTE: The SU1024YC is designed for installation on
a SerVend UC-300 dispenser only. Refer to the
SerVend UC-300 Installation Use and Care Manual for
dispenser cleaning/sanitizing procedures.

**The Q1400C ice machine control board does not energize

a Clean light.

**The Q1400C ice machine control board can not perform

step 7, and must remain in the CLEAN position until the
Clean cycle is finished. Moving the toggle switch to the ICE
position will initiate a Freeze cycle.

–38–

SANITIZING PROCEDURE

!

Caution

Use sanitizer to remove algae or slime. Do not use it to
remove lime scale or other mineral deposits. T o initiate
a sanitizing cycle using Manitowoc’s Patented
Cleaning/Sanitizing Technology, use the following
procedure.

Step 1. Set the toggle switch to the OFF position after
ice falls from the evaporator at the end of a Harvest
cycle. Or, set the switch to the OFF position and allow
the ice to melt off the evaporator.

Never use anything to force ice from the evaporator.
Damage may result.

Step 2. To start a sanitizing cycle, move the toggle
switch to the CLEAN position. The water will flow
through the water dump valve and down the drain. The
Clean light* will turn on to indicate the ice machine is
in the cleaning mode.

Step 3. Wait about one minute or until water starts to
flow over the evaporator.

Step 4. Add the proper amount of Manitowoc Ice
Machine Sanitizer to the water trough.

QuietQube® Models Amount of Sanitizer

Q0600C/Q0800C/Q1000C/

SU1000C/Q1400C

QDUAL 6 ounces (180 ml)

3 ounces (90 ml)

*The Q1400C ice machine control board does not energize a

Clean light.

–39–

Step 5. The ice machine will automatically time out a
ten-minute sanitizing cycle, followed by six Rinse
cycles, and then stop. The Clean light* will turn off to
indicate the sanitizing mode is completed. This entire
cycle lasts approximately 25 minutes.

NOTE: Periodic cleaning must be performed on
adjacent surface areas not contacted by the water
distribution system. If the bin requires sanitizing,
remove all of the ice and sanitize it with a solution of
1

oz. (30 ml) of sanitizer with up to 4 gal. (15 l) of

water.
Step 6. When the sanitizing process stops, move the

toggle switch to the ICE position to start ice making
again.

Step 7.**

A. The ice machine may be set to start and finish a

sanitizing procedure, and then automatically start
ice making again.

B. Wait about one minute into the sanitizing cycle

(until water starts to flow over the evaporator), then
move the switch from CLEAN to ICE position.

C. When the sanitizing cycle is completed, the Clean

light will turn off and an ice making sequence will
start automatically.

NOTE: After the toggle switch is moved to the ICE
position, opening the curtain (bin switch) will interrupt
the cleaning sequence. The sequence will resume
from the point of interruption when the curtain (bin
switch) closes.

NOTE: The SU1024YC is designed for installation on
a SerVend UC-300 dispenser only. Refer to the
SerVend UC-300 Installation Use and Care Manual for
dispenser cleaning/sanitizing procedures.

**The Q1400C ice machine control board does not energize

a Clean light.

**The Q1400C ice machine control board can not perform

step 7, and must remain in the CLEAN position until the
Clean cycle is finished. Moving the toggle switch to the ICE
position will initiate a Freeze cycle.

–40–

Automatic Cleaning System (AuCS®) Accessory

!

Caution

Important

This accessory monitors ice-making cycles and
initiates cleaning (or sanitizing) procedures
automatically. The AuCS® Accessory can be set to
automatically clean or sanitize the ice machine every
2, 4, or 12 weeks. Periodic maintenance must be
performed that includes cleaning or sanitizing the bin
(or dispenser) and adjacent surface areas, which can
not be contacted by the water distribution system.

Refer to the AuCS® Accessory Installation, Use and
Care Guide for complete details on the install ation,
operation, maintenance and cautionary statements
of this accessory.

AUTOMATIC OPERATION
The following occurs when the toggle switch is in the

ICE position:
 The ice machine control board counts the number of

ice Harvest cycles.

 The AuCS® Accessory interrupts the ice making

mode and starts the cleaning (or sanitizing) mode
when the harvest count equals the “Frequency of
Cleaning” setting of the AuCS

 When the automatic cleaning (or sanitizing) cycle is

complete (approximately 25 minutes), ice making
resumes automatically, and the “Harvest Count” is
reset to zero.

®

.

Opening the curtain switch will interrupt the cleaning
or sanitizing sequence. The sequence will resume
from the point of interruption when the curtain
recloses.

–41–

MANUAL START OPERATION

!

Caution

Step 1. Set the toggle switch to the OFF position after

ice falls from the evaporator at the end of a Harvest
cycle. Or, set the switch to the OFF position and allow
the ice to melt off the evaporator.

Never use anything to force ice from the evaporator.
Damage may result.

Step 2. To start the automatic cleaning system, move
the toggle switch to the CLEAN position. The water will
flow through the water dump valve and down the
drain. The Clean light* will turn on to indicate the ice
machine is in the cleaning mode. The AuCS

®

then
automatically adds cleaner or sanitizer to the ice
machine.

Step 3. The ice machine will automatically time out a
ten-minute cleaning or sanitizing cycle, followed by six
Rinse cycles, de-energize the Clean light* and stop.
This entire cycle lasts approximately 25 minutes.

Step 4. After the cleaning or sanitizing cycle stops,
move the toggle switch to ICE position.

Step 5.**

A. The ice machine may be set to start and finish a

cleaning or sanitizing cycle, then automatically start
ice making again.

B. You must wait about one minute into the cleaning

cycle (until water starts to flow over the evaporator),
then move the toggle switch from CLEAN to ICE
position.

C. When the cleaning or sanitizing cycle is completed,

the Clean light will turn off and an ice-making
sequence will start automatically.

**The Q1400C ice machine control board does not energize

a Clean light.

**The Q1400C ice machine control board can not perform

step 7, and must remain in the CLEAN position until the
Clean cycle is finished. Moving the toggle switch to the ICE
position will initiate the Rinse cycles. The six Rinse cycles
must be completed before a Freeze cycle can be initiated.

–42–

Removal of Parts for Cleaning or Sanitizing

!

Warning

!

Warning

!

Warning

1. Turn off the water supply to the ice machine at the
water service valve.

Disconnect electric power to the ice machine at the
electric switch box before proceeding.

2. Remove the water curtain and the components you
want to clean or sanitize. See the following pages
for removal procedures for these parts.

Wear rubber gloves and safety goggles (and/or face
shield) when handling Ice Machine Cleaner or
Sanitizer.

3. Soak the removed part(s) in a properly mixed
solution.

Solution Type Water Mixed With

Cleaner 1 gal. (4 l)

Sanitizer 4 gal. (15 l)

4. Use a soft-bristle brush or sponge (NOT a wire
brush) to carefully clean the parts.

16 oz. (500 ml)

cleaner

1 oz. (30 ml)

sanitizer

Do not mix Cleaner and Sanitizer solutions together.
It is a violation of Federal law to use these solutions
in a manner inconsistent with their labeling.

–43–

!

Caution

Do not immerse the water pump motor in the
cleaning or sanitizing solution.

5. Use the solution and a brush to clean the top,
sides, and bottom evaporator extrusions; the inside
of the ice machine panels; and the entire inside of
the bin.

6. Thoroughly rinse all of the parts and surfaces with
clean water.

7. Install the removed parts.

NOTE: Incomplete rinsing of the ice thickness probe
or water level probe may leave a residue. This could
cause the ice machine to malfunction. For best results,
brush or wipe the probe off while rinsing it. Thoroughly
dry the probe before installing it.

8. Turn on the water and electrical supply.

9. Verify the ice thickness probe is properly adjusted.

–44–

WATER DUMP VALVE

!

Warning

The water dump valve normally does not require
removal for cleaning. To determine if removal is
necessary:

1. Locate the water dump valve.

2. Set the toggle switch to ICE.

3. While the ice machine is in the Freeze mode, check
the dump valve’s clear plastic outlet drain hose for
leakage.

A. If the dump valve is leaking, remove,

disassemble and clean it.

B. If the dump valve is not leaking, do not remove

it. Instead, follow standard ice machine cleaning
procedures.

Follow the procedure below to remove the dump
valve.

Disconnect the electric power to the ice machine at
the electric service switch box and turn off the water
supply before proceeding.

1. If so equipped, remove the water dump valve shield
from its mounting bracket.

2. Lift and slide the coil retainer cap from the top of the
coil.

3. Note the position of the coil assembly on the valve
for assembly later. Leaving the wires attached, lift
the coil assembly off the valve body and the
enclosing tube.

4. Press down on the plastic nut on the enclosing tube
and rotate it 1/4 turn. Remove the enclosing tube,
plunger, and plastic gasket from the valve body.

NOTE: At this point, the water dump valve can easily
be cleaned. If complete removal is desired, continue
with step 5.

–45–

Important

DUMP VALVE REMOVAL

DO NOT

DISCONNECT

WIRES AT COIL.

RETAINING

CAP

WATER

DUMP
VALVE

VALVE

SHIELD

DUMP VALVE DISASSEMBLY

PLUNGER

SPRING STOP

PLUNGER

DIAPHRAGM

VALVE BODY

ENCLOSING

TUBE

COIL

CAP

SPRING

The plunger and the inside of the enclosing tube
must be completely dry before assembly.

NOTE: During cleaning, do not stretch, damage or
remove the spring from the plunger. If it is removed,
slide the spring’s flared end into the plunger’s slotted
top opening until the spring contacts the plunger
spring stop.

5. Remove the valve body.

6. Remove the tubing from the dump valve by twisting
the clamps off.

Remove the two screws securing the dump valve and
the mounting bracket.

–46–

WATER PUMP

!

Warning

SV1618

WATER

PUMP

POWER

CORD

LOOSEN

SCREWS.

WATER PUMP REMOVAL

(Q0600C/Q0800C/Q1000C SHOWN)

Disconnect the electric power to the ice machine at
the electric service switch box and turn off the water
supply.

1. Disconnect the water pump power cord.

2. Disconnect the hose from the pump outlet.

3. Loosen the screws securing the pump, mounting
bracket to the bulkhead.

4. Lift the pump and bracket assembly off the screws.

–47–

ICE THICKNESS PROBE

!

Warning

SV1619

DISCONNECT

WIRE LEAD.

ICE THICKNESS PROBE REMOVAL

COMPRESS

HINGE PIN

TO REMOVE.

1. Compress the side of the ice thickness probe near
the top hinge pin and remove it from the bracket.

NOTE: At this point, the ice thickness probe can easily
be cleaned. If complete removal is desired, continue
with step 2 below.

Disconnect the electric power to the ice machine at
the electric service switch box and turn off the water
supply.

2. Disconnect the wire lead from the control board
inside the electrical control box.

–48–

WATER LEVEL PROBE

!

Warning

SV1621

WATER LEVEL PROBE REMOVAL

Q0600C/Q0800C/Q1000C Shown

SCREW

WATER

LEVEL

PROBE

WATER

TROUGH

ICE

MACHINE

SIDE

PANEL

WIRE
LEAD

Q0600C/Q0800C/Q1000C/QDUAL

1. Loosen the screw that holds the water level probe
in place. The probe can easily be cleaned at this
point without proceeding to step 2.

Disconnect the electrical power to the ice machine at
the electrical disconnect before proceeding.

2. If complete removal is required, disconnect the wire
lead from the control board (1F) inside the electrical
control box.

–49–

SPLASH SHIELD

NYLATCH CONNECTORS

PULL FORWARD TO

DISENGAGE.

Q1400 Shown

Q1400C/QDUAL

1. Pull forward on left and right Nylatch connectors
until disengaged from ice machine (connectors
remain attached to splash shield).

2. Remove panel from front of ice machine by lifting
forward and up.

Important

Splash shield must be reinstalled to prevent water
leakage.

–50–

WATER CURTAIN

SV1213

WATER CURTAIN REMOVAL

1. Gently flex the curtain in the center and remove it
from the right side.

2. Slide the left pin out.

–51–

FLOAT VALVE

SV1217

FLOAT VALVE REMOVAL

WA TER INLET

TUBE

COMPRESSION

FITTING

FILTER SCREEN

AND CAP

ON/OFF

SLIDE

SWITCH

SPLASH

SHIELD

SU1000C/Q1400C

1. Turn off the water supply to the ice machine at the
water service valve.

2. Turn the splash shield counterclockwise one or two
turns.

3. Pull the float valve forward and off the mounting
bracket.

4. Disconnect the water inlet tube from the float valve
at the compression fitting.

5. Remove the filter screen and cap for cleaning.

–52–

WATER INLET VALVE

!

Warning

Q0600C/Q0800C/Q1000C/QDUAL

The water inlet valve normally does not require
removal for cleaning. Follow the instructions below to
determine if removal is necessary.

1. Set the ICE/OFF/CLEAN switch to OFF. Locate the
water inlet (in the water area of the ice machine). It
directs water into the water trough.

2. When the ice machine is off, the water inlet valve
must completely stop water flow into the machine.
Watch for water flow. If water flows, remove,
disassemble and clean the valve.

3. When the ice machine is on, the water inlet valve
must allow the proper water flow through it. Set the
toggle switch to ON. Watch for water flow into the
ice machine. If the water flow is slow or only trickles
into the ice machine, remove, disassemble, and
clean the valve.

Disconnect the electric power to the ice machine at
the electric service switch box and turn off the water
supply before proceeding.

Continued on Next Page...

–53–

Follow the procedure below to remove the water inlet

SV1622

WATER INLET VALVE REMOVAL

WATER

INLET

VALVE

FILTER
ACCESS
SCREWS

INCOMING

WATER

LINE

valve.

1. Remove the valve shield if necessary.

2. Remove the filter access screws that hold the valve
in place.

NOTE: The water inlet valve can be disassemble d and
cleaned without disconnecting the incoming water
supply line to the ice machine.

3. Remove, clean, and install the filter screen.

4. If necessary, remove the enclosing tube access
screws to clean interior components.

–54–

WATER DISTRIBUTION TUBE

!

Caution

SV1620

WATER DISTRIBUTION TUBE REMOVAL

THUMBSCREW

DISTRIBUTION

TUBE

1. LIFT UP.

2. SLIDE BACK.

3. SLIDE TO RIGHT.

THUMB­SCREW

1

2

3

1. Disconnect the water hose from the distribution
tube.

2. Loosen the thumbscrews, which secure the
distribution tube.

3. Lift the end of the distribution tube with the hose
fitting up, and then slide it back and to the right.

Do not force this removal. Be sure the locating tab is
clear before sliding the distribution tube back.

–55–

4. Disassemble for cleaning.

SV1211

WATER DISTRIBUTION TUBE DISASSEMBLY

INNER

TUBE

INNER

TUBE

KEYWAY

TAB

A. Twist both of the inner tube ends until the tabs

line up with the keyways.

B. Pull the inner tube ends outward.

–56–

WATER TROUGH REMOVAL

SV1771B

REMOVE THE TWO

QUARTER TURN

FASTENERS BY TURNING

COUNTERCLOCKWISE.

WATER TROUGH REMOVAL

Q1400C/QDUAL

1. Remove the front splash shield, water pump and
float valve from the ice machine.

2. Remove the quarter turn fasteners (turn
counterclockwise) securing the trough in place.

3. Lift up and forward on the front of the water trough
while allowing the rear of the water trough to drop.
Remove the water trough from the ice machine.

–57–

WATER TROUGH REMOVAL

Pins Located Behind Water Curtain

1

SU1000C (SerVend UC-300 Dispenser)

1. Remove the quarter turn fasteners (turn
counterclockwise) securing the trough in place.

2. Pull forward on the water trough until the rear pins
disengage from the water trough.

3. Lift up and forward on the front of the water trough
while allowing the rear of the water trough to drop.

4. Remove the water trough from the ice machine.

–58–

Removal from Service/Winterization

!

Caution

GENERAL

Special precautions must be taken if the ice machine is
to be removed from service for an extended period of
time or exposed to ambient temperatures of 32°F
(0°C) or below.

If water is allowed to remain in the ice machine in
freezing temperatures, severe damage to some
components could result. Damage of this nature is
not covered by the warranty.

1. Place the ice machine toggle switch in the OFF
position.

2. Turn off the water supply.

3. Remove the water from the water trough.

4. Disconnect and drain the incoming ice-making
water line at the rear of the ice machine.

5. Blow compressed air in the drain openings in the
rear of the ice machine until no more water comes
out of the drain.

6. Place the toggle switch in the ICE position, then
wait 45 seconds for the water fill solenoid valve to
energize. Blow compressed air through the
incoming water supply in the rear of the ice
machine until no more water comes out of the inlet
water line.

7. Make sure water is not trapped in any of the water
lines, drain lines, distribution tubes, etc.

–63–

CVD1476 WATER COOLED CONDENSING UNIT

Place the ice machine toggle switch into the OFF
position.

1. "Front seat" (shut off) the receiver service valve.
Hang a tag on the switch as a reminder to open the
valve before restarting.

2. Perform steps 1-6 under "Q1400C Head Section".

3. Insert a large screwdriver between the bottom
spring coils of the water regulating valve. Pry
upward to open the valve.

4. Hold the valve open and blow compressed air
through the condenser until no water remains.

AuCS® ACCESSORY

Refer to the AuCS® Accessory manual for
Winterization of the AuCS

®

Accessory.

–64–

Component Identification

SV1754

WATER INLET

VALVE

LIQUID LINE

SOLENOID

VALVE

WATER DUMP

VALVE

DRAIN HOSE

LIQUID LINE

SHUT-OFF VALVE

SUCTION LINE

SHUT-OFF VALVE

RECEIVER

RECEIVER

SERVICE

VALVE

COOL VAPOR

VALVE

ICE MACHINE HEAD SECTION
Q0600C/Q0800C/Q1000C

–65–

Q0600C/Q0800C/Q1000C

SV1605A

FLOW CLAMP USED

ON REGULAR SIZE

CUBE ONLY

DISTRIBUTION

TUBE

ICE THICKNESS

PROBE

EVAPORATOR

WATER CURTAIN

WATER TROUGH

WATER PUMP

ICE/OFF/CLEAN

SWITCH

–66–

SU1000C/SerVend UC-300 Dispenser

Ice Thickness Probe

Electrical Compartment &

Toggle Switch

Dump Valve

Water Trough

Water Curtain

Water Pump/Float

Valve Access Panels

Cool Vapor

Valve

Water Pump

Liquid Line Drier

Float Valve

Liquid Line

Solenoid

Valve

–67–

Q1400C

ICE/OFF/CLEAN

SWITCH

SV1770LH

ICE

THICKNESS

PROBE

COOL VAPOR

VALVE

FLOAT VALVE
WATER INLET

SUCTION LINE

SHUT-OFF V ALVE

SV1770RH

LIQUID LINE

SHUT-OFF VALVE

COOL VAPOR

VALVE

WATER DUMP

VALVE

LIQUID LINE

SOLENOID

VALVE

RECEIVER

RECEIVER

SERVICE

VALVE

Receiver Service Valve

–68–

QDUAL

DISTRIBUTION

TUBE

SV1780

EVAPORATOR WATER PUMP

WATER CURTAIN

WATER TROUGH

–69–

CVD® CONDENSING UNIT

ACCESS VALVE

CONDENSER

FAN MOTOR

HEAD PRESSURE
CONTROL VAL VE

AIR CONDENSER

COMPRESSOR

SUCTION

ACCUMULATOR

LIQUID LINE AND

SUCTION LINE

CONNECTION POINTS

ELECTRICAL

COMPARTMENT

SV2085

CVD0675/CVD0875/CVD1075/CVD1475

–70–

CVD1476

LIQUID LINE AND

SUCTION LINE

CONNECTION POINTS

SUCTION

ACCUMULATOR

COMPRESSOR

WATER COOLED

CONDENSER

HEAD

PRESSURE

CONTROL

VALVE

ELECTRICAL

COMPARTMENT

WATER

REGULATING

VALVE

–71–

CVD1875/CVD2075

ACCESS VALVES

CVD1875 SHOWN

CONDENSER

FAN MOTOR

AIR CONDENSER

HEAD PRESSURE
CONTROL VAL V E

COMPRESSOR

SUCTION

ACCUMULATOR

LIQUID LINE AND

SUCTION LINE

CONNECTION POINTS

ELECTRICAL

COMPARTMENT

–72–

Ice Making Sequence of Operation

Q0600C/Q0800C/Q1000C/SU1000C
Initial Start-Up or Start-Up After 

Automatic Shut-Off

1. Water Purge

Before the compressor starts, the water pump and
water dump solenoid are energized for 45 seconds to
purge the ice machine of old water. This ensures that
the ice-making cycle starts with fresh water.

The cool vapor solenoid valve is also energized during
the water purge, although it stays on for an additional
5 seconds (50-second total on time) during the initial
refrigeration system start-up.

2. Refrigeration System Start-Up

Ice Machine Section: The liquid line solenoid valve
energizes after the 45-second water purge, and
remains on throughout the entire Freeze and Harvest
sequences. The cool vapor solenoid valve remains on
for 5 seconds during initial compressor start-up and
then shuts off.

The water fill valve is energized at the same time as
the liquid line solenoid valve.

®

CVD

Condensing Unit: When the refrigerant pressure
is high enough to close the low-pressure control (after
the cool vapor valve energizes in step 1), the contactor
coil is energized and the compressor starts. The
compressor and fan cycling control* are supplied with
power throughout the entire Freeze and Harvest
sequences. When the refrigerant pressure is high
enough to close the fan cycling pressure control, the
condenser fan motor starts.

*The Q0600C ice machines does not use a fan cycling

control. The compressor and the condenser fan motor are
wired through the contactor. Anytime the contactor coil is
energized, these components are supplied with power.

–73–

Freeze Sequence

3. Prechill

The compressor is on for 30 seconds prior to water
flow to prechill the evaporator. The water fill valve
remains on until the water level probe is satisfied.

4. Freeze

The water pump restarts after the 30-second prechill.
An even flow of water is directed across the
evaporator and into each cube cell, where it freezes.
The water fill valve will cycle on, then off one more
time to refill the water trough.

When sufficient ice has fo rmed, the wate r flow (not the
ice) contacts the ice thickness probe. After
approximately 7 seconds of continual water contact,
the Harvest sequence is initiated. The ice machine
cannot initiate a Harvest sequence until a 6-minute
freeze lock has been surpassed.

–74–

Harvest Sequence

5. Water Purge

The water pump continues to run, and the water dump
valve energizes for 45 seconds to purge the water in
the sump trough. The water fill valve energizes for the
last 15 seconds of the 45-second water purge.

After the 45-second water purge, the water fill valve,
water pump and dump valve de-energize. (Refer to
“Water Purge Adjustment” for details.)

The cool vapor solenoid valve also opens at the
beginning of the water purge to divert refrigerant gas
into the evaporator.

When the refrigerant pressure is low enough to open
the fan cycling pressure control,* the condenser fan
motor stops.

*The Q0600C ice machine does not use a fan cycle control;

therefore the condenser fan motor will continue to run in the
Harvest cycle.

6. Harvest

The cool vapor solenoid valve remains open and the
refrigerant gas warms the evaporator causing the
cubes to slide as a sheet, off the evaporator and into
the storage bin. The sliding sheet of cubes swings the
water curtain out, opening the bin switch.

The momentary opening and reclosing of the bin
switch terminates the Harvest sequence and returns
the ice machine to the Freeze sequence (steps 3-4).

–75–

Automatic Shut-Off

7. Automatic Shut-Off

Ice Machine Section: When the storage bin is full at
the end of a Harvest sequence, the sheet of ice cubes
fails to clear the water curtain and will hold it open.
After the water curtain is held open for 7 seconds, the
ice machine shuts off. The ice machine remains off for
3 minutes before it can automatically restart.

®

CVD

Condensing Unit: The liquid line solenoid valve
closes, allowing the refrigeration system to pump
down. When the refrigerant pressure is low enough to
open the fan cycling pressure control,* the condenser
fan motor stops. When the refrigerant pressure is low
enough to open the low-pressure control, the contactor
coil is de-energized and the compressor stops.

The ice machine remains off until enough ice has been
removed from the storage bin to allow the ice to fall
clear of the water curtain. As the water curtain swings
back to the operating position, the bin switch recloses
and the ice machine restarts (steps 1-2), provided the
3-minute delay period is complete.

*The Q0600C ice machine does not use a fan cycle control;

therefore the condenser fan motor will energize and de­energize with the compressor.

–76–

Initial Start-Up

1. Water Purge

–77–

2. Refrigeration
System Start-Up

Ice Making

Sequence of

Operation

Q600C/Q800C/Q1000C/SU1000C Energized Parts Chart

Control Board Relays Condensing Unit

1
Water
Pump

On Off On On Off

Off On On Off On

2

Water

Fill

Valve

3

Cool
Vapor
Valve

4
Water
Dump
Valve

5

Liquid

Line

Solenoid

LPC

Contactor

Coil

Closed

On

Closed

On

Contactor

Comp

Fan Motor*

Off

On

Length

of Time

45 Seconds

5 Seconds

Freeze Sequence

3. Prechill

Off

4. Freeze On

May Cycle

On/Off

During

First 45 Sec.

Cycles Off

Then On

One More Time

Locked out
After 6 min.

Off Off On

Off Off On

Closed

On

Closed

On

On

On

30 Seconds

Unit 7 Sec.

Water Contact

w/Ice Thickness

Probe

Q600C/Q800C/Q1000C/SU1000C Energized Parts Chart

Ice Making

Sequence of

Operation

1
Water
Pump

Harvest Sequence

5. Water Purge

On

–78–

6. Harvest Off Off On Off On

Control Board Relays Condensing Unit

2

Water

Fill

Valve

3

Cool
Vapor
Valve

4
Water
Dump
Valve

30 Sec.

Off,

15 Sec.

On On On

On

5

Liquid

Line

Solenoid

LPC

Contactor

Coil

Closed

On

Closed

On

Contactor

Comp

Fan Motor*

CVD675

On

All others

May Cycle

On/Off

CVD675

On

All others

May Cycle

On/Off

Length

of Time

Factory

Set at

45 Seconds

Bin Switch

Activation

7. Automatic
Shut-Off

Off Off Off Off Off Off Off

Until Bin

Switch

Recloses

Q1400C
Initial Start-Up or St art- Up After Automatic Shut-Off

1. Water Purge

Before the refrigeration system starts, the water pump
and water dump solenoid are energized for 45 seconds,
to purge the ice machine of old water. This feature
ensures that the ice making cycle starts with fresh
water.

Freeze Sequence

2. Prechill

Ice Machine Section: The liquid line solenoid valve
energizes after the 45-second water purge and
remains on for the entire ice making Freeze and
Harvest sequences. The liquid line solenoid is
energized for 30 seconds prior to water flow. This
allows the refrigeration system to start up and prechills
the evaporator.

®

CVD

Condensing Unit: When the refrigerant pressure
is high enough to close the low pressure switch, the
contactor coil is energized and the compressor and
condenser fan motor (CVD1475 only) start. They are
supplied with power throughout the entire Freeze and
Harvest sequences. The fan motor (CVD1475 only) is
wired through a fan cycle pressure control, therefore it
may cycle on and off.

3. Freeze

The water pump restarts after the 30-second prechill.
An even flow of water is directed across the
evaporator and into each cube cell, where it freezes.

When sufficient ice has fo rmed, the wate r flow (not the
ice) contacts the ice thickness probe. After
approximately 7 seconds of continual water contact,
the Harvest sequence is initiated. The ice machine
cannot initiate a Harvest sequence until a 6-minute
freeze lock has been surpassed.

–79–

Harvest Sequence

4. Water Purge

The water pump continues to run, and the water dump
valve energizes for 45 seconds to purge the water in
the sump trough. After the 45-second water purge, the
water pump and dump valve de-energizes.

Both cool vapor solenoid valves also open at the
beginning of the water purge to divert refrigerant gas
into the evaporator.

5. Harvest

The cool vapor solenoid valves remain open, and the
refrigerant gas warms each evaporator causing the
cubes to slide as a sheet, off the evaporator and into
the storage bin. The ice may fall first from either the
right or the left evaporator, or both at the same time.
The sliding sheet of cubes swings the water curtain
out, opening the corresponding bin switch.

The momentary opening and closing of the bin switch
de-energizes relay #2 (right) or #3 (left). Opening relay
#2 or #3 de-energizes the corresponding cool vapor
solenoid valve for the remainder of the Harvest sequence.
The momentary opening and reclosing of both bin
switches terminates the Harvest sequence and returns
the ice machine to the Freeze sequence (steps 2-3).

Automatic Shut-Off

6. Automatic Shut-Off

Ice Machine Section: When the storage bin is full at the
end of a Harvest sequence, the sheet of cubes fails to
clear either one or both of the water curtains. After one
or both water curtains are held open for 7 seconds, all
five relays open and the ice machine shuts off.

®

CVD

Condensing Unit: When the refrigerant pressure
is low enough to open the low pressure switch, the
contactor coil is de-energized and the compressor and
condenser fan motor (CVD1475 only) stop.

The ice machine remains off until enough ice has been
removed from the storage bin to allow the ice to fall
clear of the water curtain(s). As the water curtain
swings back to the operating position, the bin switch
recloses and the ice machine restarts (steps 1-2).

–80–

Ice Making

Sequence of

Initial Start-Up

–81–

1. Water Purge

Freeze Sequence

Operation

Energized Parts Chart – Model Q1400C

Control Board Relays Condensing Unit

1
Water
Pump

On Off Off On Off Open Off

2

Cool

Vapor

Valve
Right

3

Cool

Vapor

Valve

Left

4
Water
Dump
Valve

5

Liquid

Line

Solenoid

Valve

LPCO*

Contactor

Coil

Contactor
Condenser
Fan Motor*

Compressor

Length

of Time

45 Seconds

2. Prechill

Off Off Off Off On Closed **On

30 Seconds

Energized Parts Chart – Model Q1400C (Continued)

Control Board Relays Condensing Unit

Ice Making

Sequence of

Operation

3. Freeze On Off Off Off On Closed **On

–82–

Harvest Sequence

4. Water Purge

1
Water
Pump

2

Cool

Vapor

Valve
Right

3

Cool

Vapor

Valve

Left

4
Water
Dump
Valve

5

Liquid

Line

Solenoid

Valve

LPCO*

Contactor

Coil

On On On On On Closed **On

Contactor
Condenser
Fan Motor*

Compressor

Length

of Time

Unit 7 Sec.

Water Contact

w/Ice Thickness

Probe

Factory

Set at

45 Seconds

5. Harvest Off On On Off On Closed

**On

Bin Switch

Activation

Ice Making

Sequence of

Operation

Energized Parts Chart – Model Q1400C (Continued)

Control Board Relays Condensing Unit

1
Water
Pump

2

Cool

Vapor

Valve
Right

3

Cool

Vapor

Valve

Left

4
Water
Dump
Valve

5

Liquid

Line

Solenoid

Valve

LPCO*

Contactor

Coil

Contactor
Condenser
Fan Motor*

Compressor

Length

of Time

6. Automatic
Shut-Off

–83–

*Low Pressure Control (close on pressure increase).
**CVD1375/CVD1475 ONLY - The fan motor is wired through a fan cycle pressure control, therefore, it may cycle on and off.

Off Off Off Off Off Open Off

Until BOTH Bin

Switches
Recloses

QDUAL
Initial Start-Up or St art- Up After Automatic Shut-Off

1. Water Purge

Before the refrigeration system starts, the water pump
and water dump solenoid are energized for 45 seconds,
to purge the ice machine of old water. This feature
ensures that the ice-making cycle starts with fresh
water. The cool vapor solenoid valves are also
energized during the water purge, although they stay
on for an additional 5 seconds (50 seconds total on
time) then shut off.

2. Refrigeration System Start-Up

Ice Machine Section: The liquid line solenoid valve
energizes after the 45-second water purge, and
remains on throughout the entire Freeze and Harvest
sequences. The cool vapor solenoid valves remain on
for 5 seconds during initial compressor start-up and
then shut off.

The water fill valve is energized at the same time as
the liquid line solenoid valve.

®

CVD

Condensing Unit: When the refrigerant pressure
is high enough to close the low pressure control (after
the cool vapor valves energize in step 1), the contactor
coil is energized and the compressor starts. The
compressor and fan cycling control are supplied with
power throughout the entire Freeze and Harvest
sequences. When the refrigerant pressure is high
enough to close the fan cycling pressure control, the
condenser fan motor starts.

–84–

Freeze Sequence

3. Prechill

The liquid line solenoid is energized for 30 seconds
prior to water flow. This allows the refrigeration system
to start up and prechill the evaporator. The water fill
valve remains energized until the water level sensor is
satisfied.

4. Freeze

The water pump restarts after the 30-second prechill.
An even flow of water is directed across the
evaporator and into each cube cell, where it freezes.
The water fill valve will cycle on one more time to refill
the water trough as needed. When sufficient ice has
formed, the water flow (not the ice) contacts the ice
thickness probe. After approximately 10 seconds of
continual water contact, the Harvest sequence is
initiated. The ice machine cannot initiate a Harvest
sequence until a 6-minute freeze lock has been
surpassed.

–85–

Harvest Sequence

5. Water Purge

The water pump continues to run, and the water dump
valve energizes for 45 seconds to purge the water in
the sump trough. The water fill valve energizes for the
last 15 seconds of the 45-second water purge. After
the 45-second water purge, the water fill valve, water
pump, and dump solenoid valve de-energize. The cool
vapor solenoids open at the beginning of the water
purge.

6. Harvest

The cool vapor valves remain open, and the
refrigerant warms each evaporator causing the cubes
to slide as a sheet, off the evaporator and into the
storage bin. The ice may fall first from either the right
or the left evaporator, or both at the same time. The
sliding sheet of cubes swings the water curtain out,
opening the corresponding bin switch and de­energizing the cool vapor valve. The momentary
opening and reclosing of both bin switches terminates
the Harvest sequence and returns the ice machine to
the Freeze sequence (steps 3-4).

–86–

6A. Water Assist Harvest Feature

Typical duration of a Harvest sequence is less than

2.5 minutes. When the Harvest sequence time
reaches 4 minutes, the following occurs:

4 minutes into a Harvest sequence: The water fill valve
will energize to fill the trough with water.

5 minutes into a Harvest sequence: The water pump
will energize and flow water over the evaporators.

The water fill valve and water pump remain on until all
bin switches have been activated, or until the 7-minute
Harvest sequence time limit is reached.

7. Automatic Shut-Off

Ice Machine Section: When the storage bin is full at
the end of a Harvest sequence, the sheet of cubes
fails to clear either one or both of the water curtains.
After one or both water curtains are held open for *30
seconds, the ice machine shuts off.

*Note: Early production control boards checked for bin
switch closure within 7 seconds.

®

CVD

Condensing Unit: When the refrigerant pressure
is low enough to open the low pressure switch, the
contactor coil is de-energized and the compressor and
condenser fan motor stop.

The ice machine remains off until enough ice has been
removed from the storage bin to allow the ice to fall
clear of the water curtain(s). As the water curtains
swing back to the operating position, the bin switch
recloses and the ice machine restarts (steps 1-2),
provided the 3-minute delay period is complete. Both
curtains must be closed to start an ice-making
sequence.

Ice Making

Sequence of

Operation

Initial Start-Up

1
Water
Pump

Energized Parts Chart – Model QDUAL

Control Board Relays Condensing Unit

2

Water

Fill

Solenoid

3

Dump

Valve

4

Liquid

Line

Solenoid

5

Cool
Vapor
Valve

1

6

Cool
Vapor
Valve

2

Contactor

LPCO*

Coil

Contactor
Fan Motor

and

Compressor

Length

of Time

1. Water Purge

–88–

2. Refrigeration
System Start-Up

On Off On Off On On Closed On

Off On Off On On On Closed **On

45 Seconds

5 Seconds

Sequence of

Freeze Sequence

3. Prechill

–89–

Ice Making

Operation

Energized Parts Chart – Model QDUAL (Continued)

Control Board Relays Condensing Unit

1
Water
Pump

Off

2

Water

Fill

Solenoid

On

Until Water

is Sensed

3

Dump

Valve

4

Liquid

Line

Solenoid

5

Cool
Vapor
Valve

1

6

Cool
Vapor
Valve

2

Off On Off Off Closed **On

LPCO*

Contactor

Coil

Contactor
Fan Motor

and

Compressor

Length

of Time

30 Seconds

4. Freeze On

Harvest Sequence

5. Water Purge

On

Cycles

Off

Then On

1 More

Time

30 Sec.

Off

15 Sec.

On

Off On Off Off Closed **On

On On On On Closed **On

Until 10

Sec.water

cont act w/Ice

Thickness

Probe

Water Purge

Factory Set

at 45 Sec.

Ice Making

Sequence of

Operation

Energized Parts Chart – Model QDUAL (Continued)

Control Board Relays Condensing Unit

1
Water
Pump

2

Water

Fill

Solenoid

3

Dump

Valve

4

Liquid

Line

Solenoid

5

Cool
Vapor
Valve

1

6

Cool
Vapor
Valve

2

LPCO*

Contactor

Coil

Contactor
Fan Motor

and

Compressor

Length

of Time

6. Harvest Off Off Off On On On Closed **On

–90–

7. Auto Shut-Off Off Off Off Off Off Off Open Off

*Low pressure Control (close on pressure increase).
**The fan motor is wired through a fan cycle pressure control, therefore, it may cycle on and off.

Bin Switch

Activation

Until Bin

Switch

Recloses

Electrical System

COMPONENT SPECIFICATIONS AND DIAGNOSTICS CONTROL BOARD

All QuietQube® control boards incorporate the
following features. Refer to “Sequence of Operation”
for additional information specific to your model.

Harvest/Safety Limit Light

This light’s primary function is to be on as water
contacts the ice thickness probe during the Freeze
cycle, and remain on throughout the entire Harvest
cycle. The light will flicker as water splashes on the
probes. The light’s secondary function is to
continuously flash when the ice machine is shut off on
a safety limit, and to indicate which safety limit shut off
the ice machine.

Freeze Time Lock-In Feature

The ice machine control system incorporates a freeze
time lock-in feature. This prevents the ice machine
from short cycling in and out of Harvest.

The control board locks the ice machine in the Freeze
cycle for six minutes. If water contacts the ice
thickness probe during these six minutes, the Harvest
light will come on (to indicate that water is in contact
with the probe), but the ice machine will stay in the
Freeze cycle. After the six minutes are up, a Harvest
cycle is initiated.

To allow the service technician to initiate a Harvest
cycle without delay, this feature is not used on the first
cycle after moving the toggle switch OFF and back to
ICE.

Maximum Freeze Time

The control system includes a built-in safety that will
automatically cycle the ice machine into Harvest after
60 minutes in the Freeze cycle.

Safety Limits

There are two safety limits that protect the ice machine
if the Freeze or Harvest cycles are outside of their
guidelines.

–91–

Three-Minute Delay

The three-minute delay is initiated whenever the ice
machine cycles off (automatic shut-off) on a full bin.

The delay period starts when a water curtain is open
for 7 continuous seconds in the Harvest cycle.

 If the 3-minute delay period has expired, closure of

the water curtain will initiate an immediate start-up
of a Freeze sequence.

 If the water curtain closes before the 3-minute delay

period has expired, the ice machine will start a
Freeze sequence immediately after the 3-minute
delay period expires.

 The 3-minute delay period is overridden when the

toggle switch is moved to the OFF position, then
back to ICE.

Inputs

The control board, along with inputs, controls all
electrical components, including the ice machine
sequence of operation. Prior to diagnosing, you must
understand how the inputs affect the control board
operation. Refer to specific component specifications
(inputs), wiring diagrams and ice machine sequence of
operation sections for details.

As an example, refer to “Ice Thickness Probe” in the
component specification section of this manual for
information relating to how the probe and control
board function together.

Control Board Relays

The control board relays energize and de-energize
system components.

Relays are not field replaceable.

–92–

MAIN FUSE

!

Warning

!

Warning

Function

The control board fuse stops ice machine operation if
electrical components fail, causing high amp draw.

Specifications

The main fuse is 250 Volt, 7 amp.

High (line) voltage is applied to the control board
(terminals #55 and #56) at all times. Removing the
control board fuse or moving the toggle switch to
OFF will not remove the power supplied to the
control board.

Check Procedure

1. If the bin switch light is on with the water curtain
closed, the fuse is good.

Disconnect electrical power to the entire ice
machine before proceeding.

2. Remove the fuse. Check the resistance across the
fuse with an ohmmeter.

Reading Result

Open (OL) Replace fuse

Closed (O) Fuse is good

–95–

BIN SWITCH

Important

Function

Movement of the water curtain controls bin switch
operation. The bin switch has two main functions:

1. Terminating the Harvest cycle and returning the ice
machine to the Freeze cycle. This occurs when the
bin switch is opened and closed again within
7

seconds during the Harvest cycle.

2. Automatic ice machine shut-off.
If the storage bin is full at the end of a Harvest
cycle, the sheet of cubes fails to clear the water
curtain and holds it open. After the water curtain is
held open for 7 seconds, the ice machine shuts off.
The ice machine remains off until enough ice is
removed from the storage bin to allow the sheet of
cubes to drop clear of the water curtain. As the
water curtain swings back to the operating position,
the bin switch closes and the ice machine restarts,
provide the 3-minute delay has expired.

The water curtain must be ON (bin switch(s) closed)
to start ice making.

Specifications

The bin switch is a magnetically operated reed switch.
The magnet is attached to the lower right corner of the
water curtain. The switch is attached to the
evaporator-mounting bracket.

The bin switch is connected to a varying D.C. voltage
circuit. (Voltage does not remain constant.)

NOTE: Because of a wide variation in D.C. voltage, it
is not recommended that a voltmeter be used to check
bin switch operation.

–96–