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0Front.fm Page 1 Thursday, July 17, 2008 3:41 PM
QM45
UnderCounter Model
Ice Machines
Installation, Use & Care Manual
This manual is updated as new information and models are released.
Visit our website for the latest manual. www.manitowocfsg.com
America’s #1 Selling Ice Machine
Part Number 000001774 07/08
0Front.fm Page 2 Thursday, July 17, 2008 3:41 PM
Safety Notices
As you work on Manitowoc equipment, be sure to pay close attention to the safety notices in this manual.
Disregarding the notices may lead to serious injury and/ or damage to the equipment.
Throughout this manual, you will see the following types of safety notices:
!
Warning
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.
Read These Before Proceeding:
! Caution
Proper installation, care and maintenance are essential for maximum performance and troublefree operation of your Manitowoc equipment. Read and understand this manual. It contains valuable care and maintenance information. If you encounter problems not covered by this manual, do not proceed, contact Manitowoc Foodservice Group.
We will be happy to provide assistance.
Important
Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.
! Caution
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 manual. These notices supply helpful information which may assist you as you work.
Throughout this manual, you will see the following types of procedural notices:
!
Warning
PERSONAL INJURY POTENTIAL
Do not operate equipment that has been misused, abused, neglected, damaged, or altered/modified from that of original manufactured specifications.
NOTE: SAVE THESE INSTRUCTIONS.
Important
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: Text set off as a Note provides you with simple, but useful, extra information about the procedure you are performing.
We reserve the right to make product improvements at any time.
Specifications and design are subject to change without notice.
Table of Contents
Section 1
General Information
Model Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tri-liminator Water Filter System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manitowoc Cleaner and Sanitizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model/Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Owner Warranty Registration Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commercial Warranty Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Residential Warranty Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 2
Installation Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Machine Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location of Ice Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Machine Heat of Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leveling the Ice Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse/circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . electrical Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Service/Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drain Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Supply and Drain Line Sizing/Connections . . . . . . . . . . . . . . . . . . . .
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Starting the Ice Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
2-4
2-4
2-4
2-4
2-6
2-6
2-1
2-1
2-2
2-2
2-2
2-3
2-3
2-3
1-1
1-1
1-1
1-1
1-2
1-3
1-3
1-3
1-4
Section 3
Operation
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Making Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Start-up Or Start-up After Automatic Shut-off . . . . . . . . . . . . . . . . . .
Freeze Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Harvest Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Shut-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
3-2
3-2
3-2
3-2
3-2
Part Number 000001774 07/08
i
Table of Contents
(continued)
Energized Parts Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Siphon System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Siphon System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
water Float Valve Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Bridge Thickness Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 4
Maintenance
Interior Cleaning and Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning And Sanitizing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Machine Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal From Service Winterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 5
Before Calling for Service
Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Limit Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3
3-4
3-4
3-4
3-4
3-4
3-5
3-5
4-1
4-1
4-1
4-8
4-8
4-8
4-8
5-1
5-2
5-3
ii
Part Number 000001774 07/08
Section 1
General Information
Model Numbers
This manual covers the following models:
Self-Contained
Air-Cooled
QM45A
QM45A
Self-Contained
Water-Cooled
115/60/1
230/50/1
Accessories
Contact your Manitowoc distributor for these optional accessories:
TRI-LIMINATOR WATER FILTER SYSTEM
Engineered specifically for Manitowoc ice machines, Tri-
Liminator water filters are an efficient, dependable, and affordable method of inhibiting scale formation, filtering sediment, and removing chlorine taste and odor.
MANITOWOC CLEANER AND SANITIZER
Manitowoc Ice Machine Cleaner and Sanitizer are available in convenient 16 oz. (473 ml) and 1 gal (3.78 l) bottles. These are the only cleaner and sanitizer approved for use with Manitowoc products.
Cleaner Part Number
16oz 94-0456-3
1 Gallon 94-0580-3
Sanitizer Part number
16oz 94-0565-3
1 Gallon 94-0581-3
Part Number 000001774 07/08 1-1
General Information Section 1
Model/Serial Number Location
Record the model and serial number of your ice machine in the space provided below. 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.
MODEL/SERIAL
PLATE LOCATION
MODEL/SERIAL
PLATE LOCATION
1-2
Ice Machine
Model Number
Serial Number
Model/Serial Number Location
Part Number 000001774 07/08
Section 1 General Information
Owner Warranty Registration Card
General
The packet containing this manual also includes warranty information. Warranty coverage begins the day your new ice machine is installed.
Important
Complete and mail the OWNER WARRANTY
REGISTRATION CARD as soon as possible to validate the installation date.
If you do not return your OWNER WARRANTY
REGISTRATION CARD, Manitowoc will use the date of sale to the Manitowoc Distributor as the first day of warranty coverage for your new ice machine.
COMMERCIAL WARRANTY COVERAGE
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.
Parts
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.
Labor
Labor required to repair or replace defective components is covered for three (3) years from the date of 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. 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.
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 authorized service company.
Part Number 000001774 07/08 1-3
General Information Section 1
RESIDENTIAL WARRANTY COVERAGE
WHAT DOES THIS LIMITED WARRANTY COVER?
Subject to the exclusions and limitations below,
Manitowoc Ice, Inc. (“Manitowoc”) warrants to the original consumer that any new ice machine manufactured by Manitowoc (the “Product”) shall be free of defects in material or workmanship for the warranty period outlined below under normal use and maintenance, and upon proper installation and start-up in accordance with the instruction manual supplied with the Product.
HOW LONG DOES THIS LIMITED WARRANTY
LAST?
Ice Machine - Twelve (12) months from the sale date
WHO IS COVERED BY THIS LIMITED WARRANTY?
This limited warranty only applies to the original consumer of the Product and is not transferable.
WHAT ARE MANITOWOC ICE’S OBLIGATIONS
UNDER THIS LIMITED WARRANTY?
If a defect arises and Manitowoc receives a valid warranty claim prior to the expiration of the warranty period, Manitowoc shall, at its option: (1) repair the
Product at Manitowoc’s cost, including standard straight time labor charges, (2) replace the Product with one that is new or at least as functionally equivalent as the original, or (3) refund the purchase price for the Product.
Replacement parts are warranted for 90 days or the balance of the original warranty period, whichever is longer. The foregoing constitutes Manitowoc’s sole obligation and the consumer’s exclusive remedy for any breach of this limited warranty. Manitowoc’s liability under this limited warranty is limited to the purchase price of Product. Additional expenses including, without limitation, service travel time, overtime or premium labor charges, accessing or removing the Product, or shipping are the responsibility of the consumer.
HOW TO OBTAIN WARRANTY SERVICE
To obtain warranty service or information regarding your
Product, please contact us at:
MANITOWOC ICE, INC.
2110 So. 26 th St.,
P.O. Box 1720,
Manitowoc, WI 54221-1720
Telephone: 920-682-0161 Fax: 920-683-7585 www.manitowocice.com
WHAT IS NOT COVERED?
This limited warranty does not cover, and you are solely responsible for the costs of: (1) periodic or routine maintenance, (2) repair or replacement of the Product or parts due to normal wear and tear, (3) defects or damage to the Product or parts resulting from misuse, abuse, neglect, or accidents, (4) defects or damage to the Product or parts resulting from improper or unauthorized alterations, modifications, or changes; and
(5) defects or damage to any Product that has not been installed and/or maintained in accordance with the instruction manual or technical instructions provided by
Manitowoc. To the extent that warranty exclusions are not permitted under some state laws, these exclusions may not apply to you.
EXCEPT AS STATED IN THE FOLLOWING
SENTENCE, THIS LIMITED WARRANTY IS THE SOLE
AND EXCLUSIVE WARRANTY OF MANITOWOC
WITH REGARD TO THE PRODUCT. ALL IMPLIED
WARRANTIES ARE STRICTLY LIMITED TO THE
DURATION OF THE LIMITED WARRANTY
APPLICABLE TO THE PRODUCTS AS STATED
ABOVE, INCLUDING BUT NOT LIMITED TO, ANY
WARRANTY OF MERCHANTABILITY OR OF FITNESS
FOR A PARTICULAR PURPOSE. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
IN NO EVENT SHALL MANITOWOC OR ANY OF ITS
AFFILIATES BE LIABLE TO THE CONSUMER OR ANY
OTHER PERSON FOR ANY INCIDENTAL,
CONSEQUENTIAL OR SPECIAL DAMAGES OF ANY
KIND (INCLUDING, WITHOUT LIMITATION, LOSS OF
PROFITS, REVENUE OR BUSINESS) ARISING FROM
OR IN ANY MANNER CONNECTED WITH THE
PRODUCT, ANY BREACH OF THIS LIMITED
WARRANTY, OR ANY OTHER CAUSE WHATSOEVER,
WHETHER BASED ON CONTRACT, TORT OR ANY
OTHER THEORY OF LIABILITY. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
HOW STATE LAW APPLIES
This limited warranty gives you specific legal rights, and you may also have rights that vary from state to state or from one jurisdiction to another.
REGISTRATION CARD
To secure prompt and continuing warranty service, this warranty registration card must be completed and sent to Manitowoc within thirty (30) days from the sale date.
Complete the following registration card and send it to
Manitowoc at the address shown.
1-4 Part Number 000001774 07/08
Section 2
Installation Instructions
General
These instructions are provided to assist the qualified installer.
Dimensions
50.00cm
79.00cm
57.00cm
1.90cm±0.63cm
Part Number 000001774 07/08 2-1
Installation Instructions Section 2
Location of Ice Machine
The location selected for the ice machine must meet the following criteria. If any of these criteria are not met, select another location.
• The location must be indoors.
• The location must be free of airborne and other contaminants.
• The air temperature must be at least 1.6
°C (35°F), but must not exceed 43.4
°C (110°F).
• The location must not be near heat-generating equipment or in direct sunlight.
• The location must be capable of supporting the weight of the ice machine and a full bin of ice.
• The location must allow enough clearance for water, drain and electrical connections in the rear of the ice machine.
• The location must not obstruct airflow through or around the ice machine (condenser airflow is in and out the front). Refer to the chart below for clearance requirements.
Ice machines, like other refrigeration equipment, reject heat through the condenser. It is helpful to know the amount of heat rejected by the ice machine when sizing air conditioning equipment where self-contained aircooled ice machines are installed.
Leveling the Ice Machine
After moving the ice machine into the installation location, it must be leveled for proper operation. Follow these steps to level the ice machine:
1. Check the level of the ice machine from front to back and from side to side.
Top/Sides
Back
Self-Contained Air-Cooled
5” (127 mm)*
5” (127 mm)*
NOTE: The ice machine may be built into a cabinet.
There is no minimum clearance requirement for the top or left and right sides of the ice machine. The listed values are recommended for efficient operation and servicing only.
! Caution
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” Section 4.
Ice Machine Heat of Rejection
Series
Ice Machine
QM45
Heat of Rejection*
Air Conditioning**
1750
Peak
2600
* B.T.U./Hour
** Because the heat of rejection varies during the ice making cycle, the figure shown is an average.
Checking for Level
2. If the ice machine is not level, adjust the leveling glides on each corner of the base of the ice machine as necessary.
Leveling Glide
3. Check the level of the ice machine after each adjustment of the leveling glides.
4. Repeat steps 2 and 3 until the ice machine is level from front to back and from side to side.
2-2 Part Number 000001774 07/08
Section 2
Electrical Service
!
Warning
All wiring must conform to local, state and national codes.
Voltage Phase
230/50/1
115/60/1
Total Amps
2.6
5.2
VOLTAGE
The maximum allowable voltage variation is
± 10% of the rated voltage on the ice machine model/serial number plate at start-up (when the electrical load is highest).
!
Warning
The ice machine must be grounded in accordance with national and local electrical codes.
Installation Instructions
!
Warning
Never use an extension cord. If an outlet is not within reach of the ice machine’s power cord, have a proper amperage outlet wired closer to the ice machine.
FUSE/CIRCUIT BREAKER
A separate fuse/circuit breaker must be provided for each ice machine.
NOTE: A disconnect means must be provided for field wiring.
ELECTRICAL RATING
The electrical rating is used to help select the wire size of the electrical supply. The wire size (or gauge) also depends on location, materials used, length of run, etc., so it must be determined by a qualified electrician.
Part Number 000001774 07/08 2-3
Installation Instructions Section 2
Water Service/Drains
WATER SUPPLY
Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, remove chlorine, and improve taste and clarity.
Important
If you are installing a Manitowoc Tri-Liminator water filter system, refer to the Installation
Instructions supplied with the filter system for ice making water inlet connections.
Follow these guidelines to install water inlet lines:
• Connect to potable water supply only.
• 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.
•
• Install a water shut-off valve for both the ice making and condenser water lines (if applicable).
Insulate water lines to prevent condensation.
Important
The water inlet line is connected to the water valve. This valve is located just behind the front panel of the ice machine.
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 2.5 cm (1 inch) drop per 1 meter (40 inches) of run, and must not create traps.
• The floor drain must be large enough to accommodate drainage from all drains.
• Insulate the bin drain line to prevent condensation.
WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS
! Caution
Plumbing must conform to state and local codes.
Ice Making
Water Inlet
Ice Making/
Bin Water
Drain
1 Min. = Minimum
2 Max. = Maximum
Water
Temperature
Water
Pressure
0.6
°C (33°F)
Min.
1
32.2
°C (90°F)
Max.
2
137.9 kPA (20 psi)
Min.
1
551.5 kPA (80 psi)
Max.
2
—— ——
Ice Machine
Fitting
3/8”
male hose connection
1.59 cm (5/8”)
inside diameter flexible hose
Tubing Size Up to Ice
Machine Fitting
0.95 cm (3/8”)
minimum inside diameter
1.59 cm (5/8”)
minimum inside diameter
2-4 Part Number 000001774 07/08
Section 2 Installation Instructions
ICE MAKING WATER
INLET TUBING 3/8”
MIN.I.D.
WATER
SHUTOFF
ICE MAKING WATER/BIN
DRAIN 5/8” MIN.I.D.
Typical Water Supply and Drain Line Sizing and Connections
Part Number 000001774 07/08 2-5
Installation Instructions Section 2
Installation Checklist
Is the ice machine level?
Has all of the internal packing been removed?
Have all of the electrical and water connections been made?
Has the supply voltage been tested and checked against the rating on the nameplate?
Is there proper clearance around the ice machine for air circulation?
Has the ice machine been installed where ambient temperatures will remain in the range of 35° – 110°F (1.7° – 43.3°C)?
Has the ice machine been installed where the incoming water temperature will remain in the range of 33° – 90°F (0.6° – 32.2°C)?
Are all electrical leads free from contact with refrigeration lines and moving equipment?
Has the owner/operator been instructed regarding maintenance and the use of
Manitowoc Cleaner and Sanitizer?
Has the owner/operator completed the warranty registration card?
Before Starting the Ice Machine
All Manitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installations do not require any adjustment.
To ensure proper operation, follow the Operational
Checks on page 3-4 of this manual. Starting the ice machine and completing the Operational Checks are the responsibilities of the owner/operator.
NOTE: Adjustments and maintenance procedures outlined in this manual are not covered by the warranty.
!
Warning
PERSONAL INJURY POTENTIAL
Do not operate equipment that has been misused, abused, neglected, damaged, or altered/modified from that of original manufactured specifications.
Has the ice machine and bin been sanitized?
Has this manual been given to the owner/ operator?
2-6 Part Number 000001774 07/08
Component Identification
WATER DISTRIBUTION
ICE THICKNESS PROBE
Section 3
Operation
FLOAT VALVE ASSEMBLY
WATER TROUGH
ICE DAMPER
BIN SWITCH MAGNET
WATER PUMP
CONDENSER AIR FILTER
ON/OFF/WASH TOGGLE SWITCH
Part Number 000001774 07/08 3-1
Operation Section 3
Ice Making Sequence of Operation
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
1.
Pressure Equalization
Before the compressor starts the hot gas valve is energized for 15 seconds to equalize pressures during the initial refrigeration system start-up.
2.
Refrigeration System Start-Up
The compressor starts after the 15-second pressure equalization, and remains on throughout the entire
Freeze and Harvest Sequences. The hot gas valve remains on for 5 seconds during initial compressor startup 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 relay. As a result, any time the relay coil is energized, the compressor and fan motor are supplied with power.)
FREEZE SEQUENCE
3.
Prechill
The compressor is on for 30 seconds prior to water flow to Prechill the evaporator.
4.
Freeze
The water pump starts 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 formed, the water 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 time has been surpassed.
HARVEST SEQUENCE
5.
Harvest
The water pump de-energizes stopping flow over the evaporator. The rising level of water in the sump trough diverts water out of the overflow tube, purging excess minerals from the sump trough. The hot gas valve also opens to divert hot refrigerant gas into the evaporator.
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 contacts the ice damper, 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 (steps 3 - 4).
AUTOMATIC SHUT-OFF
6.
Automatic Shut-Off
When the storage bin is full at the end of a Harvest
Sequence, the sheet of cubes fails to clear the ice damper and will hold it down. After the ice damper 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 damper. As the ice damper 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.
3-2 Part Number 000001774 07/08
Section 3
Energized Parts Chart
1
CONTROL BOARD RELAYS
2 3
WATER
PUMP
HOT GAS
VALVE
RELAY
COIL
INITIAL START-UP/
START UP AFTER
AUTO SHUT-OFF:
1. Pressure
Equalization
2. Refrigeration
System Start-up
FREEZE
SEQUENCE:
3. Pre-Chill
OFF
OFF
OFF
ON
ON
OFF
OFF
ON
ON
4. Freeze ON OFF ON ON ON
Operation
3A
RELAY
COMPRESSOR
3B
CONDENSER
∗
FAN MOTOR
LENGTH of “ON” TIME
OFF
ON
ON
OFF
ON
ON
15
Seconds
5
Seconds
30
Seconds
Until 7 sec. water contact with ice thickness probe
Bin switch activation
HARVEST
SEQUENCE:
OFF ON ON ON ON
5. Harvest
AUTOMATIC SHUT-
OFF:
OFF OFF OFF OFF OFF
6. Auto Shut-Off
* Condenser Fan Motor: The fan motor is wired through a fan cycle pressure control, therefore, it may cycle on and off.
Until bin switch re-closes
Part Number 000001774 07/08 3-3
Operation Section 3
Operational Checks
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 follow 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.
SIPHON SYSTEM
To reduce mineral build-up and cleaning frequency, the water in the sump trough must be purged during each harvest cycle.
When the water pump de-energizes the level in the water trough rises above the standpipe starting a siphon action. The siphon action stops when the water level in the sump trough drops. When the siphon action stops, the float valve refills the water trough to the correct level.
Siphon System Check
Follow steps 1 through 6 under water level check.
SIPHON
CAP
WATER FLOAT VALVE CHECK
Before water will flow into the water trough the float valve shut-off must be in the OPEN position.
PRESS TO
CLOSE
Water Level
PRESS TO
OPEN
WATER
LEVEL
STANDPIPE
DRAIN
3-4 Part Number 000001774 07/08
Section 3 Operation
WATER LEVEL CHECK
Check the water level while the ice machine is in the ice mode and the water pump is running. The correct water level is 1/4”(6.3mm) to 3/8” (9.5mm) below the top of the standpipe a line in the water trough indicates the correct level.
SIPHON CAP
ICE BRIDGE THICKNESS CHECK
The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8” (3.2 mm).
1. Inspect the bridge connecting the cubes. It should be about 1/8” (3.2 mm) thick.
2. If adjustment is necessary, turn the ice thickness probe adjustment screw clockwise to increase bridge thickness, or counterclockwise to decrease bridge thickness.
NOTE: Turning the adjustment 1/3 of a turn will change the ice thickness about 1/16” (1.5 mm).
ADJUSTING SCREW
SET THE WATER LEVEL
TO THE LINE IN THE
WATER TROUGH
Water Level
The float valve is factory-set for the proper water level. If adjustments are necessary:
1. Verify the ice machine is level (see page 2-4).
2. Remove the siphon cap from the standpipe.
3. Place the main ON/OFF/WASH toggle switch to the
ON position, and wait until the float valve stops adding water.
4. Adjust the water level to (1/4" to 3/8"
5. (6.3 to 9.5 mm) below the standpipe) the line in
6. the water trough:
7. Loosen the two screws on the float valve bracket.
8. Raise or lower the float valve assembly as necessary, then tighten the screws.
9. Move the main ON/OFF/ WASH toggle switch to the
OFF position. The water level in the trough will rise above the standpipe and run down the drain.
10. Replace the siphon cap on the standpipe, and verify water level and siphon action by repeating steps 3 through 5.
1/8” ICE BRIDGE THICKNESS
Ice Thickness Check
Make sure the ice thickness probe wire and the bracket do not restrict movement of the probe.
Part Number 000001774 07/08 3-5
Operation
THIS PAGE INTENTIONALLY LEFT BLANK
Section 3
3-6 Part Number 000001774 07/08
Section 4
Maintenance
Interior Cleaning and Sanitizing
GENERAL
Clean and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent cleaning and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment.
The ice machine must be taken apart for cleaning and sanitizing.
Step 3 To start a cleaning cycle, move the toggle switch to the WASH position.
Step 4 Add the proper amount of Manitowoc Ice
Machine Cleaner to the water trough.
Model
QM45
Amount of Cleaner
1.5 ounces (45 ml)
Step 5 Wait until the clean cycle is complete
(approximately 22 minutes) then place the toggle switch in the OFF position, disconnect power and water supplies to the ice machine.
! Caution
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.
CLEANING AND SANITIZING PROCEDURE
! Caution
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.
!
Warning
Disconnect electric power to the ice machine at the electric switch box before proceeding.
Step 6 Remove parts for cleaning.
A. Remove the Vinyl Hose
• Disconnect the water hose from the distribution tube and water pump.
B. Remove Water Pump
• Disconnect the water pump power cord.
DO NOT SOAK
WATER PUMP MOTOR IN
CLEANER OR SANITIZER
SOLUTIONS
!
Warning
Wear rubber gloves and safety goggles (and/or face shield) when handling Ice Machine Cleaner or
Sanitizer.
Ice machine cleaner is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime.
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.
! Caution
Never use anything to force ice from the evaporator.
Damage may result.
Step 2 Remove all ice from the bin.
Water Pump Removal
• Loosen the screws securing the pumpmounting bracket to the bulkhead.
• Lift the pump and bracket assembly off the mounting screws.
Part Number 000001774 07/08 4-1
Maintenance
C. Remove the Ice Thickness Probe
• Compress the side of the ice thickness probe near the top hinge pin and remove it from the bracket.
ICE THICKNESS
PROBE
Section 4
D. Remove the Water Distribution Tube
1. LIFT UP
2. SLIDE BACK
3. SLIDE TO RIGHT
DISTRIBUTION
TUBE
3
2
1
THUMBSCREW
LOCATING
PIN
COMPRESS SIDES OF ICE
THICKNESS PROBE
THUMBSCREW
Ice Thickness Probe Removal
NOTE: At this point, the ice thickness probe can easily be cleaned. If complete removal is desired follow the ice thickness probe wire to the bulkhead grommet (exit point) in the back wall. Pop the bulkhead grommet out of the back wall by inserting fingernails or a flat object between the back wall and the grommet and prying forward. Pull the bulkhead grommet and wire forward until the connector is accessible, then disconnect the wire lead from the connector.
Ice Thickness Probe Cleaning
• Mix a solution of Manitowoc ice machine cleaner and water (2 ounces of cleaner to 16 ounces of water) in a container.
• Soak the ice thickness probe a minimum of 10 minutes.
Clean all ice thickness probe surfaces and verify the ice thickness probe cavity is clean. Rinse thoroughly with clean water, then dry completely. Incomplete rinsing and drying of the ice thickness probe can cause premature harvest.
Water Distribution Tube Removal
• Loosen the two thumbscrews, which secure the distribution tube.
• Lift the right side of the distribution tube up off the locating pin, then slide it back and to the right.
! Caution
Do not force this removal. Be sure the locating pin is clear of the hole before sliding the distribution tube out.
Disassembly
• Twist both of the inner tube ends until the tabs line up with the keyways.
• Pull the inner tube ends outward.
INNER TUBE
TAB
INNER TUBE
4-2
KEYWAY
Water Distribution Tube Disassembly
Part Number 000001774 07/08
Section 4 Maintenance
E. Remove the Float Valve
• Turn the splash shield counterclockwise one or two turns.
FLOAT VALVE
BRACKET
COMPRESSION
FITTING
SHUT-OFF VALVE
SPLASH SHIELD
F. Remove the Water Trough
• Apply downward pressure on the siphon tube and remove from the bottom of the water trough.
• Remove the upper thumbscrew.
• While supporting the water trough remove the two thumbscrews from beneath the water trough.
• Remove the water trough from the bin area.
UPPER
THUMBSCREW
CAP AND
FILTER SCREEN
FLOAT
Float Valve Removal
• Pull the float valve forward and off the mounting bracket.
• Disconnect the water inlet tube from the float valve at the compression fitting.
• Remove the cap and filter screen for cleaning.
LOWER
THUMBSCREWS
REMOVE
SIPHON TUBE
Part Number 000001774 07/08 4-3
Maintenance Section 4
G. Remove the ice damper.
• Grasp ice damper and apply pressure toward the left hand mounting bracket.
• Apply pressure to the right hand mounting bracket with thumb.
• Pull ice damper forward when the right hand ice damper pin disengages.
Installation
• Place ice damper pin in left hand mounting bracket and apply pressure toward the left hand mounting bracket.
• Apply pressure to the right hand mounting bracket with thumb.
• Push ice damper toward evaporator until right hand damper pin engages.
H. Remove the Bin Door
• Grasp the rear of the bin door and pull bin door forward approximately 5”.
• Slide bin door to the rear while applying upward pressure (The rear door pins will ride up into the track slot and slide backward to the stop tab).
• While applying pressure against the bin door pull down on the rear of each bin door track until the door pins clear the stop tabs.
• Slide the rear door pins off the end and then below the door track. Slide bin door forward allowing the back of the door to lower into the bin. Continue forward with the bin door until the front pins bottom out in the track.
• Lift right side of door until the front pins clear the track, then remove door from bin.
PRESS DOWN
TO RELEASE
DOOR
STOP TAB
TRACK SLOT
SLIDE DOOR
FORWARD
4-4 Part Number 000001774 07/08
Section 4 Maintenance
Step 7 Mix a solution of cleaner and warm water.
Depending on the amount of mineral buildup, a larger quantity of solution may be required. Use the ratio in the table below to mix enough solution to thoroughly clean all parts.
Solution Type
Cleaner
Water
1 gal. (4 l)
Mixed with
16 oz (500 ml) cleaner
Step 15 Add the proper amount of Manitowoc Ice
Machine Sanitizer to the water trough.
Model
QM45
Amount of Sanitizer
1.5 ounces (45 ml)
Step 16 Wait until the sanitize cycle is complete
(approximately 22 minutes) then place the toggle switch in the OFF position, disconnect power and water supplies to the ice machine.
Step 8 Use ½ of the cleaner/water solution to clean all components. The cleaner solution will foam when it contacts lime scale and mineral deposits; once the foaming stops use a soft bristle brush, sponge or cloth
(not a wire brush) to carefully clean the parts. Soak the parts for 5 minutes (15 – 20 minutes for heavily scaled parts). Rinse all components with clean water.
Step 9 While components are soaking, use ½ of the cleaner/water solution to clean all foodzone surfaces of the ice machine and bin. Use a nylon brush or cloth to thoroughly clean the following ice machine areas:
• Evaporator plastic parts – including top, bottom and sides
• Bin bottom, sides and top
Rinse all areas thoroughly with clean water.
Step 10 Mix a solution of sanitizer and warm water.
Solution Type
Sanitizer
Water
6 gal. (23 l)
Mixed With
4 oz (120 ml) sanitizer
Step 11 Use 1/2 of the sanitizer/water solution to sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution. Do not rinse parts after sanitizing.
Step 12 Use 1/2 of the sanitizer/water solution to sanitize all foodzone surfaces of the ice machine and bin. Use a cloth or sponge to liberally apply the solution.
When sanitizing, pay particular attention to the following areas:
• Evaporator plastic parts - including top, bottom and sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 13 Replace all removed components.
Step 14 Reapply power and water to the ice machine and place the toggle switch in the WASH position.
!
Warning
Disconnect electric power to the ice machine at the electric switch box before proceeding.
Step 17 Repeat step 6 to remove parts for hand sanitizing.
Step 18 Mix a solution of sanitizer and warm water.
Solution Type
Sanitizer
Water
6 gal. (23 l)
Mixed With
4 oz (120 ml) sanitizer
Step 19 Use 1/2 of the sanitizer/water solution to sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution. Do not rinse parts after sanitizing.
Step 20 Use 1/2 of the sanitizer/water solution to sanitize all foodzone surfaces of the ice machine and bin. Use a cloth or sponge to liberally apply the solution.
When sanitizing, pay particular attention to the following areas:
• Evaporator plastic parts - including top, bottom and sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 21 Replace all removed components.
Step 22 Reapply power and water to the ice machine and place the toggle switch in the ICE position.
Part Number 000001774 07/08 4-5
Maintenance Section 4
Ice Machine Inspection
Check all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbing or vibrating against other tubing, panels, etc.
Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate airflow through and around the ice machine to maximize ice production and ensure long component life.
Exterior Cleaning
Clean the area around the ice machine as often as necessary to maintain cleanliness and efficient operation.
Sponge any dust and dirt off the outside of the ice machine with mild soap and water. Wipe dry with a clean, soft cloth.
A commercial grade stainless steel cleaner/polish can be used as necessary.
Cleaning the Condenser
4. Use a commercial condenser coil cleaner. Follow the directions and cautions supplied with the cleaner.
5. Straighten any bent condenser fins with a fin comb.
6. Carefully wipe off the fan blades and motor with a soft cloth. Do not bend the fan blades. If the fan blades are excessively dirty, wash with warm, soapy water and rinse thoroughly.
! Caution
If you are cleaning the condenser fan blades with water, cover the fan motor to prevent water damage.
Removal From Service Winterization
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.
! Caution
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.
!
Warning
Disconnect electric power to the ice machine at the electric service switch before cleaning the condenser.
A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below.
!
Warning
The condenser fins are sharp. Use care when cleaning them.
1. The washable aluminum filter on self-contained ice machines is designed to catch dust, dirt, lint and grease. This helps keep the condenser clean. Clean the filter with a mild soap and water solution.
2. Clean the outside of the condenser with a soft brush or a vacuum with a brush attachment. Clean from top to bottom, not side to side. Be careful not to bend the condenser fins.
3. Shine a flashlight through the condenser to check for dirt between the fins. If dirt remains: Blow compressed air through the condenser fins from the inside. Be careful not to bend the fan blades.
Follow the applicable procedure below.
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.
4-6 Part Number 000001774 07/08
Section 5
Before Calling for Service
Checklist
If a problem arises during operation of your ice machine, follow the checklist below before calling service. Routine adjustments and maintenance procedures are not covered by the warranty.
Problem
Ice machine does not operate.
Ice machine does not cycle into harvest mode.
Possible Cause To Correct
No electrical power to the ice machine.
Replace the fuse/reset the breaker/turn on the main switch/plug power cord into receptacle.
ON/OFF/ WASH toggle switch set improperly.
Damper in open position (down).
Move the toggle switch to the ON position.
Damper must be in upright position and capable of swinging freely.
Safety limit feature stopping the ice machine. Refer to “Safety Limit Feature” on the next page.
Ice machine stops, and can be restarted by moving the toggle switch to OFF and back to ICE.
Ice machine does not release ice or is slow to harvest.
Ice machine is dirty.
Ice machine is not level.
Low air temperature around ice machine.
Clean and sanitize the ice machine.
Level the ice machine.
Air temperature must be at least 35
°F
(1.7
°C).
Wait for freeze lock-in to expire.
Ice quality is poor
(soft or not clear).
The six-minute freeze time lock-in has not expired yet.
Ice thickness probe is dirty.
Ice thickness probe wire is disconnected.
Ice thickness probe is out of adjustment.
Uneven ice fill (thin at top of evaporator).
Poor incoming water quality.
Water filtration is poor.
Ice machine is dirty.
Water siphon is not working.
Water softener is working improperly
(if applicable).
Clean and sanitize the ice machine.
Connect the wire.
Adjust the ice thickness probe.
See “Shallow or Incomplete Cubes” on the next page.
Contact a qualified service company to test the quality of the incoming water and make appropriate filter recommendations.
Replace the filter.
Clean and sanitize the ice machine.
Check the water siphon system.
Repair the water softener.
Continued on next page...
Part Number 000001774 07/08 5-1
Before Calling for Service Section 5
Problem
Ice machine produces shallow or incomplete cubes, or the ice fill pattern on the evaporator is incomplete.
Low ice capacity.
Possible Cause
Ice thickness probe is out of adjustment.
Water trough level is to high or too low.
Water float valve filter screen is dirty.
Water filtration is poor.
Hot incoming water.
Water float valve is not working.
Incorrect incoming water pressure.
Ice machine is not level.
Water float valve filter screen is dirty.
Incoming water supply is shut off.
Water float valve stuck open or leaking.
The condenser is dirty.
High air temperature around ice machine.
Inadequate clearance around the ice machine.
Objects stacked around ice machine, blocking airflow to condenser.
Safety Limit Feature
In addition to the standard safety controls, your
Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure.
Before calling for service, re-start the ice machine using the following procedure:
1. Move the ON/OFF/ WASH switch to OFF and then back to ON.
A. If the safety limit feature has stopped the ice machine, it will restart after a short delay.
Proceed to step 2.
B. If the ice machine does not restart, see “Ice machine does not operate” on the previous page.
2. Allow the ice machine to run to determine if the condition is reoccurring.
A. If the ice machine stops again, the condition has reoccurred. Call for service.
B. If the ice machine continues to run, the condition has corrected itself. Allow the ice machine to continue running.
To Correct
Adjust the ice thickness probe.
Check the water level.
Remove and clean the filter screen.
Replace the filter.
Connect the ice machine to a cold water supply.
Remove the water float valve and clean it.
Water pressure must be 20-80 psi (137.9 -
551.5 kPA).
Level the ice machine.
Remove and clean the filter screen.
Open the water service valve.
Remove the water float valve and clean it.
Clean the condenser.
Air temperature must not exceed 110
°F
(43.3
°C).
Provide adequate clearance.
Remove items blocking airflow.
5-2 Part Number 000001774 07/08
Section 5 Before Calling for Service
SAFETY LIMITS
General
In addition to standard safety controls, the control board has two built in safety limit controls which protect the ice machine from major component failures.
Safety Limit #1: If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle.
If three consecutive 60-minute freeze cycles occur, the ice machine stops.
Safety Limit #2: If the harvest time reaches 3.5 minutes, the control board automatically returns the ice machine to the freeze cycle. If three consecutive 3.5 minute harvest cycles occur, the ice machine stops.
Safety Limit Stand-By Mode:
The first time a safety limit shut down occurs, the ice machine turns off for 60 minutes (Stand-by Mode). The ice machine will then automatically restart to see if the problem reoccurs. During the Stand-By Mode the harvest light will be flashing continuously and a safety limit indication can be viewed. If the same safety limit is reached a second time (the problem has reoccurred) the ice machine will initiate a safety limit shut down and remain off until it is manually restarted. During a safety limit shut down the harvest light will be flashing continuously.
Determining Which Safety Limit
Stopped The Ice Machine
When a safety limit condition causes the ice machine to stop, the harvest light on the control board continually flashes on and off. Use the following procedures to determine which safety limit has stopped the ice machine.
1. Move the toggle switch to OFF.
2. Move the toggle switch back to ON.
3. Watch the harvest light. It will flash one or two times, corresponding to safety limits 1 and 2, to indicate which safety limit stopped the ice machine.
After safety limit indication, the ice machine will restart and run until a safety limit is exceeded again.
Safety Limit Notes
• A safety limit indication is completed before the water pump starts. Water contacting the ice thickness probe in the freeze cycle will cause the harvest light to flash. Do not mistake a harvest light flashing in the freeze cycle with a safety limit indication.
• A continuous run of 100 harvests automatically erases the safety limit code.
• The control board will store and indicate only one safety limit – the last one exceeded.
• If the toggle switch is moved to the OFF position and then back to the ON position prior to reaching the
100-harvest point, the last safety limit exceeded will be indicated.
• If the harvest light did not flash prior to the ice machine restarting, then the ice machine did not stop because it exceeded a safety limit.
Part Number 000001774 07/08 5-3
Before Calling for Service Section 5
Safety Limit #1
Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.
Possible Cause
Improper installation
Water system
Electrical system
Restricted condenser air flow
Refrigeration system
Check/Correct
See “Installation Instructions” Section 2 of this manual
Low water pressure (20 psi minimum.)
High water pressure (80 psi maximum.)
High water temperature (90°F/32.2°C maximum.)
Clogged water distribution tube
Dirty/defective water float valve
Loss of water from sump area
Defective water pump
Ice thickness probe out of adjustment
Harvest cycle not initiated electrically
Compressor relay not energizing
Compressor electrically non-operational
High inlet air temperature (110°F/43.3°C maximum.)
Condenser discharge air recirculation
Dirty condenser filter
Dirty condenser fins
Defective fan cycling control
Defective fan motor
Non-Manitowoc components
Improper refrigerant charge
Defective hot gas valve
Defective compressor
TXV starving or flooding (check insulation and bulb mounting)
Non-condensables in refrigeration system
Plugged or restricted high side refrigerant lines or component
Because there are many possible external problems,do not limit your diagnosis to only the items listed in these charts.
5-4 Part Number 000001774 07/08
Section 5 Before Calling for Service
Safety Limit #2
Harvest time exceeds 3.5 minutes for 3 consecutive harvest cycles.
Possible Cause
Improper installation
Water system
Electrical system
Refrigeration system
Check/Correct
See “Installation Instructions” Section 2 of this manual
Water area (evaporator) dirty
Water freezing behind evaporator
Low water pressure (20 psi minimum.)
Loss of water from sump area
Clogged water distribution tube
Dirty/defective water float valve
Defective water pump
Ice thickness probe out of adjustment
Ice thickness probe dirty
Bin switch defective
Premature harvest
Non-Manitowoc components
Improper refrigerant charge
Defective hot gas valve
TXV flooding (check insulation and bulb mounting)
Defective fan cycling control
Because there are many possible external problems,do not limit your diagnosis to only the items listed in these charts.
Part Number 000001774 07/08 5-5
Before Calling for Service
THIS PAGE INTENTIONALLY LEFT BLANK
Section 5
5-6 Part Number 000001774 07/08
© 2007 Manitowoc
Continuing product improvements may necessitate change of specifications without notice.
Part Number 000001774 07/08
Manitowoc Foodservice Group
2110 South 26th Street, P.O. Box 1720
Manitowoc, WI 54221-1720, USA
Ph: 920-682-0161 Fax: 920-683-7589
Visit us online at: www.manitowocfsg.com

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