MANITOWOC Ice Machine Service Manual

©Manitowoc Ice, Inc.

P/N 80-1099-9 8/03

Safety Notices

Warning

Caution

Important

As you work on a Q Model Ice Machine, 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 ice machine.

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 potential personal injury situation. Be sure to read the Caution statement before proceeding, and work carefully.

Procedural Notices

As you work on a Q Model Ice Machine, be sure to read the procedural notices in this handbook. These notices supply helpful information that 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 may slow you down as you work.

NOTE: T ext set off as a Note provides you with simple, but useful extra information about the procedure you are performing.

Read These Before Proceeding:

Caution

Important

Warning

Proper installation, care and maintenance are essential for maximum ice production and trouble free operation of your Manitowoc Ice Machine. If you encounter problems not covered by this manual, do not proceed; contact Manitowoc Ice, Inc. We will be happy to provide assistance.

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

We reserve the right to make product improvements at any time. Specifications and design are subject to change without notice.

PERSONAL INJURY POTENTIAL

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

PERSONAL INJURY POTENTIAL

The ice machine head section contains 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. The technician must also be U.S. Government Environmental Protection Agency (EPA) certified in proper refrigerant handling and servicing procedures.

Table of Contents

General Information

How to Read a Model Number..............................1

Ice Cube Sizes................ ... ... ................................1

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

Ice Machine Warranty Information ........................2

Owner Warranty Registration Card .................. 2

Warranty Coverage.......................................... 3

Installation

Location of Ice Machine........................................ 5

Ice Machine Head Section Clearance

Requirements........................................................ 5

Stacking Two Ice Machines on a

Single Storage Bin ................................................6

Calculating Remote Condenser 

Installation Distances........................................ 7

Removal from Service/Winterization

General ...............................................................11

Self-Contained Air-Cooled Ice Machines ............ 11

Water-Cooled Ice Machines................................11

Remote Ice Machines.......................................... 12

AuCS® Accessory...............................................12

Ice Making Sequence of Operation

Self-Contained Air- and Water-Cooled................ 13

Initial Start-Up or Start-Up After 

Automatic Shut-Off......................................... 13

Freeze Sequence...........................................14

Harvest Sequence..........................................15

Automatic Shut-Off......................................... 16

Energized Parts Chart.................................... 17

Remote................................................................ 19

Initial Start-Up or Start-Up After

Automatic Shut-Off......................................... 19

Freeze Sequence...........................................20

Harvest Sequence..........................................21

Automatic Shut-Off......................................... 21

Remote Energized Parts Chart.......................22

Electrical System

Wiring Diagrams..................................................25

Wiring Diagram Legend..................................25

Q200/Q280/Q320 - Self Contained -

1 Phase With Terminal Board.........................26

Q280/Q370 - Self Contained - 

1 Phase Without Terminal Board....................27

Q320 - Self Contained - 

1 Phase Without Terminal Board....................28

Q420/Q450/Q600/Q800/Q1000 - Self Contained- 

1 Phase With Terminal Board.........................29

Q420/Q450/Q600/Q800/Q1000 - Self Contained-

1 Phase Without Terminal Board....................30

Q800/Q1000 - Self Contained - 

3 Phase With Terminal Board.........................31

Q800/Q1000 - Self Contained - 

3 Phase Without Terminal Board....................32

Q1300/Q1800 - Self Contained -

1 Phase With Terminal Board.........................33

Q1300/Q1600/Q1800 - Self Contained - 

1 Phase Without Terminal Board....................34

Q1300/Q1800 - Self Contained - 

3 Phase With Terminal Board.........................35

Q1300/Q1600/Q1800 - Self Contained -

3 Phase Without Terminal Board....................36

Q450/Q600/Q800/Q1000 - Remote - 

1 Phase With Terminal Board.........................37

Q450/Q600/Q800/Q1000 - Remote -

1 Phase Without Terminal Board....................38

Q800/Q1000 -Remote - 

3 Phase With Terminal Board.........................39

Q800/Q1000 - Remote - 

3 Phase Without Terminal Board....................40

Q1300/Q1800 - Remote - 

1 Phase With Terminal Board.........................41

Q1300/Q1600/Q1800 - Remote - 

1 Phase Without Terminal Board....................42

Q1300/Q1800 - Remote - 

3 Phase With Terminal Board.........................43

Q1300/Q1600/Q1800 - Remote -

3 Phase Without Terminal Board....................44

Component Specifications and 

Diagnostics..........................................................45

General...........................................................45

Safety Limits...................................................45

Inputs..............................................................45

Main Fuse.......................................................46

Bin Switch.......................................................47

Water Curtain Removal Notes........................ 49

ICE/OFF/CLEAN Toggle Switch..................... 50

Ice Thickness Probe (Harvest Initiation)......... 51

Ice Thickness Probe Diagnostics................... 53

Diagnosing Ice Thickness Control Circuitry.... 54

Water Level Control Circuitry..........................56

Diagnosing an Ice Machine Head Section 

that Will Not Run............................................. 63

Compressor Electrical Diagnostics................. 64

Diagnosing Capacitors ...................................66

Refrigeration System

Refrigeration System Diagnostics....................... 71

Before Beginning Service............................... 71

Ice Production Check .....................................72

Installation/Visual Inspection Checklist........... 73

Water System Checklist.................................74

Ice Formation Pattern.....................................75

Safety Limits................................................... 77

Analyzing Discharge Pressure.......................85

Analyzing Suction Pressure............................88

Single Expansion Valve Ice Machines - Comparing Evaporator Inlet and 

Outlet Temperatures....................................... 92

Discharge Line Temperature Analysis............ 96

How to Use the Refrigeration System

Operational Analysis Tables........................... 98

Refrigeration System Operational Analysis

Tables........................................................... 101

Pressure Control Specifications 

and Diagnostics.................................................108

Harvest Pressure Regulating (HPR) System

Remotes Only...............................................108

Headmaster Control Valve ...........................112

Fan Cycle Control

(Self-Contained Air-Cooled Models Only) .... 115

High Pressure Cutout (HPCO) Control......... 116

Refrigeration Tubing Schematics......................117

Self-Contained Air- or

Water -Cooled Models.................................. 117

Remote Models ............................................118

Cycle Times/24-Hour Ice Production/

Refrigerant Pressure Charts..............................119

Q200 Series

Self-Contained Air-Cooled......................... 120

Self-Contained Water-Cooled....................121

Q280 Series

Self-Contained Air-Cooled......................... 122

Self-Contained Water-Cooled....................123

Q320 Series

Self-Contained Air-Cooled......................... 124

Self-Contained Water-Cooled....................125

Q370 Series

Self-Contained Air-Cooled......................... 126

Self-Contained Water-Cooled....................127

Q420/450 Series

Self-Contained Air-Cooled......................... 128

Self-Contained Water-Cooled....................129

Remote......................................................130

Q600 Series

Self-Contained Air-Cooled......................... 131

Self-Contained Water-Cooled....................132

Remote......................................................133

Q800 Series

Self-Contained Air-Cooled......................... 134

Self-Contained Water-Cooled....................135

Remote......................................................136

Q1000 Series

Self-Contained Air-Cooled......................... 137

Self-Contained Water-Cooled....................138

Remote......................................................139

Q1300 Series

Self-Contained Air-Cooled......................... 140

Self-Contained Water-Cooled....................141

Remote......................................................142

Q1600 Series

Self-Contained Water-Cooled....................143

Remote.....................................................144

Q1800 Series

Self-Contained Air-Cooled......................... 145

Self-Contained Water-Cooled....................146

Remote......................................................147

Refrigerant Recovery/Evacuation......................148

Normal Self-Contained Model Procedures... 148

Normal Remote Model Procedures.............. 152

System Contamination Clean-Up...................... 157

General.........................................................157

Determining Severity Of Contamination....... 157

Cleanup Procedure ........................... .. ... ...... 159

Replacing Pressure Controls Without Removing

Refrigerant Charge.......................................162

Filter-Driers...................................................164

Total System Refrigerant Charge................. 165

Additional Refrigerant Charges.........................166

For Line Sets Between 50’ - 100’.................166

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General Information

Q R 0450 A

ICE MACHINE

MODEL

ICE CUBE SIZE

R REGULAR D DICE Y HALF DICE

# C U BE S I Z E

0 REGULAR 1 REGULAR 2 DICE 3 DICE 4 HALF-DICE 5 HALF-DICE

CONDENSER TYPE

AIR-COOLED WATER-COOLED AIR-COOLED WATER-COOLED AIR-COOLED WATER-COOLED

A SELF-CONTAINED AIR-COOLED W SELF-CONTAINED WATER-COOLED N REMOTE AIR-COOLED

9 REMOTE AIR-COOLED

CONDENSER TYPE

ICE MACHINE

SERI ES

HOW TO READ A MODEL NUMBER

ICE CUBE SIZES

Regular

1-1/8" x 1-1/8" x 7/8"

2.86 x 2.86 x

2.22 cm

Dice

7/8" x 7/8" x 7/8"

2.22 x 2.22 x

2.22 cm

–1–

Half Dice

3/8" x 1-1/8" x 7/8"

0.95 x 2.86 x

2.22 cm

MODEL/SERIAL NUMBER LOCATION

Important

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.

ICE MACHINE WARRANTY INFORMATION 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.

–2–

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.

–3–

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.

–4–

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.

 The location must not obstruct air flow through or

around the ice machine. Refer to chart below for clearance requirements.

 The ice machine must be protected if it will be

subjected to temperatures below 32°F (0°C). Failure caused by exposure to freezing temperatures is not covered by the warranty. See “Removal from Service/Winterization”

ICE MACHINE HEAD SECTION CLEARANCE REQUIREMENTS

Q370

Top/Sides 12" (30.5 cm) 5" (12.7 cm)

Back 5" (12.7 cm) 5" (12.7 cm)

Self-Contained

Air-Cooled

Water-Cooled

Q1300 Q1600

Q1800

Top/Sides 24" (61 cm) 8" (20.3 cm)

Back 12" (30.5 cm) 5" (12.7 cm)

All other

Q models

Top/Sides 8" (20.3 cm) 5" (12.7 cm)

Back 5" (12.7 cm) 5" (12.7 cm)

Q1600 is not available as an air-cooled model.

Self-Contained

Air-Cooled

Self-Contained

Air-Cooled

–5–

Water-Cooled

and Remote

Water-Cooled

and Remote

STACKING TWO ICE MACHINES ON A SINGLE STORAGE BIN

A stacking kit is required for stacking two ice machines. Installation instructions are supplied with the stacking kit.

Q450/Q600/

Q800/Q1000

Top/Sides 16" (40.64 cm) 5" (12.70 cm)

Back 5" (12.70 cm) 5" (12.70 cm)

Q1300 Q1600 Q1800

Top/Sides 48" (121.92 cm) 24" (60.96 cm)

Back 12" (30.48 cm) 12" (30.48 cm)

Q1600 is not available as an air-cooled model.

Stacked

Self-Contained

Air-Cooled

Stacked

Self-Contained

Air-Cooled

Stacked

Water-Cooled and

Remote

Stacked

Water-Cooled and

Remote

–6–

Calculating Remote Condenser 

Caution

Installation Distances

LINE SET LENGTH The maximum length is 100' (30.5 m). The ice machine compressor must have the proper oil

return. 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' (30.5 m).

LINE SET RISE/DROP The maximum rise is 35' (10.7 m). The maximum drop is 15' (4.5 m).

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.

–7–

CALCULATED LINE SET DISTANCE The maximum calculated distance is 150' (45.7 m). Line set rises, drops, horizontal runs (or combinations

of these) in excess of the stated maximums will exceed compressor start-up and design limits. This will cause poor oil return to the compressor.

Make the following calculations to make sure the line set layout is within specifications.

1. Insert the measured rise into the formula below. Multiply by 1.7 to get the calculated rise.



(Example: A condenser located 10 feet above the ice machine has a calculated rise of 17 feet.)

2. Insert the measured drop into the formula below. Multiply by 6.6 to get the calculated drop.



(Example. A condenser located 10 feet below the ice machine has a calculated drop of 66 feet.)

3. Insert the measured horizontal distance into the formula below. No calculation is necessary.

4. Add together the calculated rise, calculated drop, and horizontal distance to get the total calculated distance. If this total exceeds 150' (45.7 m), move the condenser to a new location and perform the calculations again.

MAXIMUM LINE SET DISTANCE FORMULA

Step 1. 

Measured Rise ____ X 1.7 = ______Calculated Rise (35 ft. Max)

Step 2. 

Measured Drop ____ X 6.6 = ______Calculated Drop (15 ft. Max.)

Step 3. 

Measured Horizontal Distance = _________Horizontal (100 ft. Max.) Distance

Step 4. 

Total Calculated Distance = ________Total Calculated (150 ft. Max.) Distance

–8–

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–9–

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–10–

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.

Follow the applicable procedure below.

SELF-CONTAINED AIR-COOLED ICE MACHINES

1. Disconnect the electric power at the circuit breaker or the electric service switch.

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 both the incoming water and the drain openings in the rear of the ice machine until no more water comes out of the inlet water lines or the drain.

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

WATER-COOLED ICE MACHINES

1. Perform steps 1-6 under “Self-Contained AirCooled Ice Machines.”

2. Disconnect the incoming water and drain lines from the water-cooled condenser.

–11–

3. Insert a large screwdriver between the bottom

SV1624

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.

REMOTE ICE MACHINES

1. Move the ICE/OFF/CLEAN switch to OFF.

2. “Frontseat” (shut off) the receiver service valves. Hang a tag on the switch as a reminder to open the valves before restarting.

3. Perform steps 1-6 under “Self-Contained AirCooled Ice Machines.”

AUCS® ACCESSORY

Refer to the AuCS Accessory manual for winterization of the AuCS



Accessory.

–12–

Ice Making Sequence of Operation

SELF-CONTAINED AIR- AND WATER-COOLED 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 harvest valve(s) 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

The compressor starts after the 45 second water purge, and it remains on throughout the entire Freeze and Harvest Sequences. The water fill valve is energized at the same time as the compressor. It remains on until the water level sensor closes for 3 continuous seconds, or until a six-minute time period has expired. The harvest valve(s) remains on for 5 seconds during initial compressor start-up and then shuts off.

At the same time the compressor starts, the condenser fan motor (air-cooled models) is supplied with power throughout the entire Freeze and Harvest Sequences. The fan motor is wired through a fan cycle pressure control, therefore it may cycle on and off. (The compressor and condenser fan motor are wired through the contactor. As a result, anytime the contactor coil is energized, the compressor and fan motor are supplied with power.)

–13–

Freeze Sequence

3. Prechill

The compressor is on for 30 seconds prior to water flow to prechill the evaporator.

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.

–14–

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 (turns on) and de-energizes (turns off) strictly by time. The water fill valve energizes for the last 15 seconds of the 45-second water purge. The water purge

must be at the factory setting of 45 seconds for the fill valve to energize during the last 15 seconds of the Water Purge. If set at less than 45 seconds the water fill valve does not energize during the 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 harvest valve also opens at the beginning of the water purge to divert hot refrigerant gas into the evaporator.

6. Harvest

The harvest valve(s) 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 re-closing of the bin switch terminates the harvest sequence and returns the ice machine to the freeze sequence (Step 3 - 4.)

–15–

Automatic Shut-Off

7. Automatic Shut-Off

When the storage bin is full at the end of a harvest sequence, the sheet of 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.

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 re-closes and the ice machine restarts (steps 1 - 2), provided the 3 minute delay period is complete.

–16–

Ice Making

Sequence of

Operation

Initial Start-Up

1. Water Purge

–17–

2. Refrigeration System Start-up

Freeze Sequence

3. Prechill

4. Freeze On

Energized Parts Chart

Control Board Relays Contactor

1 Water Pump

On Off On On Off Off Off

Off On On Off On On

Off

Water Fill

Valve

May Cycle

On/Off

during first

45 sec. Cycles

On then Off

one more

time

Harvest

Valve

4 Water Dump Valve

Contactor

Coil

Compressor

Off Off On On

Condenser

Fan Motor

May Cycle

On/Off

May Cycle

On/Off

May Cycle

On/Off

Length

of Time

45 Seconds

5 Seconds

30 Seconds

Unit 7 Sec.

Water Contact

w/Ice Thickness Probe

Energized Parts Chart (Continued)

Ice Making

Sequence of

Operation

1 Water Pump

Harvest Sequence

5. Water Purge

–18–

6. Harvest Off Off On Off On On

7. Automatic Shut-Off

Off Off Off Off Off Off Off

Control Board Relays Contactor

Water Fill

Valve

30 sec.

Off

15 sec.

Harvest

Valve

4 Water Dump Valve

Contactor

Coil

On On On On

Compressor

Condenser

Fan Motor

May Cycle

On/Off

May Cycle

On/Off

Length

of Time

Factory

Set at

45 Seconds

Bin Switch

Activation

Until Bin Switch

Re-closes

REMOTE 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 completely purge the ice machine of old water. This feature ensures that the ice making cycle starts with fresh water.

The harvest valve and harvest pressure regulating (HPR) solenoid valves also energize during water purge, although they stay on for an additional 5 seconds (50 seconds total on time) during the initial refrigeration system start-up.

2. Refrigeration System Start-Up

The compressor and liquid line solenoid valve energize after the 45 second water purge and remain on throughout the entire Freeze and Harvest Sequences. The water fill valve is energized at the same time as the compressor. It remains on until the water level sensor closes for 3 continuous seconds, or until a six-minute time period has expired. The harvest valve and HPR solenoid valves remain on for 5 seconds during initial compressor start-up and then shut off.

The remote condenser fan motor starts at the same time the compressor starts and remains on throughout the entire Freeze and Harvest Sequences.

–19–

Freeze Sequence

3. Prechill

The compressor is on for 30 seconds prior to water flow, to prechill the evaporator.

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 and 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.

–20–

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