CM050
CM Model
Ice Machines
This manual is updated as new
Information and models are released
Visit our website for the latest manual:
www.compact-ice.com
STH003
06/06
©Manitowoc Ice, Inc.
Safety Notices
When using or servicing these Ice Machines, 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:
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.
CAUTION
Text in a Caution box alerts you to a situation in
which you could damage the ice machine. Be sure
to read the Caution statement before proceeding,
and work carefully.
2
Procedural Notices
When using or servicing these Ice Machines, 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:
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 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.
3
Read These Before Proceeding:
CAUTION
Proper installation, care and maintenance are
essential for maximum ice production and trouble
free operation of your Compact Ice Machine. Read
and understand this manual. If you encounter
problems not covered by this manual, do not
proceed, contact Manitowoc Ice, Inc. We will be
happy to provide assistance.
IMPORTANT
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.
WARNING
PERSONAL INJURY POTENTIAL
Do not operate equipment that has been, misused,
abused, neglected, damaged, or altered/modified
from that of original manufactured specifications.
WARNING
POTENTIAL PERSONAL INJURY SITUATION
This ice machine 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 US Government Environmental
Protection Agency (EPA) certified in proper
refrigerant handling and servicing procedures.
4
TABLE OF CONTENTS
GENERAL INFORMATION............................. 7
MODEL NUMBERS.....................................7
ACCESSORIES........................................... 8
MODEL/SERIAL NUMBER LOCATION .......9
OWNER WARRANTY REGISTRATION........... 9
INSTALLATION .......................................... 13
LOCATION OF ICE MACHINE ..................13
ICE MACHINE HEAT OF REJECTION ......14
LEVELING THE ICE MACHINE ................15
WATER SERVICE/DRAINS ....................... 16
ELECTRICAL REQUIREMENTS................18
COMPONENT IDENTIFICATION ..............19
OPERATIONAL CHECKS ........................19
MAINTENANCE .......................................... 23
ICE MACHINE INSPECTION .................... 23
EXTERIOR CLEANING............................. 23
CLEANING THE CONDENSER ................. 23
INTERIOR CLEANING AND SANITIZING. 25
CLEANING PROCEDURE ......................... 28
REMOVAL OF PARTS FOR CLEANING AND
SANITIZING............................................. 31
ICE MAKING SEQUENCE OF OPERATION.. 39
TROUBLESHOOTING ................................. 41
DIAGNOSING AN ICE MACHINE THAT
WILL NOT RUN........................................ 41
ICE MACHINE WILL NOT HARVEST........ 43
ICE QUALITY IS POOR – CUBES ARE
SHALLOW, INCOMPLETE OR WHITE ......44
FREEZE CYCLE IS LONG, LOW ICE
PRODUCTION ..........................................45
ICE MACHINE RUNS & NO ICE IS
PRODUCED..............................................46
ANALYZING DISCHARGE PRESSURE..... 47
ANALYZING SUCTION PRESSURE .........49
5
HOT GAS VALVE..................................... 52
BIN THERMOSTAT.................................. 55
ICE PRODUCTION CHECK ...................... 57
ADJUSTING CUBE WEIGHT ................... 58
LIQUID LINE THERMISTOR .................... 59
TOTAL SYSTEM REFRIGERATION
CHARGE.................................................. 61
COMPONENT SPECIFICATIONS AND CHECK
PROCEDURES ............................................62
MAIN FUSE ............................................. 62
COMPRESSOR ELECTRICAL
DIAGNOSTICS......................................... 63
DIAGNOSING START COMPONENTS: .... 65
CYCLE TIMES, 24 HR ICE PRODUCTION AND
REFRIGERANT PRESSURE CHARTS .......... 66
REFRIGERANT DEFINITIONS ..................... 68
REFRIGERANT RE-USE POLICY ............. 69
SYSTEM CONTAMINATION CLEANUP ... 75
SEVERE SYSTEM CONTAMINATION
CLEANUP PROCEDURE ..................ERROR!
BOOKMARK NOT DEFINED.
REPLACING PRESSURE CONTROLS
WITHOUT REMOVING REFRIGERANT
CHARGE.................................................. 80
BRAZING PROCEDURES FOR DANFOSS
SOLENOID VALVES ................................ 82
FILTER-DRIERS....................................... 84
CONTROL BOARD ......................................85
WIRING DIAGRAMS .................................... 88
TUBING SCHEMATIC.................................. 87
6
GENERAL INFORMATION
MODEL NUMBERS
This manual covers the following models:
CMS050A004
WARNING
An ice machine contains high voltage electricity
and refrigerant charge. Repairs are to be
performed by properly trained refrigeration
technicians aware of the dangers of dealing with
high voltage electricity and refrigerant under
pressure.
7
ACCESSORIES
Visit our website at: www.compact-ice.com for these
optional accessories:
LEGS
Four inch adjustable legs are available.
DRAIN PUMP
Pumps waste water from ice machine to drain.
MANITOWOC ICE MACHINE CLEANER AND
SANITIZER
These are the only cleaner and sanitizer approved for
use with Compact products.
Cleaner Part Number Sanitizer Part Number
16oz 000000084 16oz 94-0565-3
CAUTION
Use only Manitowoc approved Ice Machine
Cleaner (part number 94-0546-3 original green
ice machine cleaner or 000000084 clear metal
safe ice machine cleaner) 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.
8
MODEL/SERIAL NUMBER LOCATION
The model and serial numbers are required
when
requesting information from your local Compact retailer
or Compact Ice at 800-235-9698. The model and serial
number are listed on the MODEL/SERIAL NUMBER
DECAL affixed to the ice machine
MODEL/SERIAL
NUMBER DECAL
MODEL/SERIAL
NUMBER DECAL
9
OWNER WARRANTY REGISTRATION
CARD
GENERAL
The packet containing this manual also includes
warranty information. Warranty coverage begins the
day you purchase your new ice machine.
Compact CM Series
Limited Ice Machine Warranty
Subject to the exclusions and limitations below,
Manitowoc Ice, Inc. (“Manitowoc Ice”) warrants this
CM Series Ice Machine (the “Product”) against
defects in material or workmanship as follows:
1. Labor. For a period of ninety (90) days from the
date of purchase by the consumer (“Purchaser”),
if the Product is determined to be defective,
Manitowoc Ice shall, at its option, replace the
Product or pay the labor charges to any authorized
Manitowoc Ice service facility to repair the
Product. After expiration of the ninety day (90)
period referred above, the Purchaser must pay all
labor charges.
2. Parts. In addition, for a period of twelve (12)
months from the date of purchase by the
Purchaser, if the Product is determined to be
defective, Manitowoc Ice shall, at its option,
replace the Product or provide new or rebuilt
replacement parts for the Product at no charge.
REPAIR OR REPLACEMENT AS PROVIDED ABOVE
IS THE PURCHASER’S SOLE AND EXCLUSIVE
REMEDY UNDER THIS LIMITED WARRANTY.
10
This limited warranty only applies to the original
Purchaser of the Product and is not transferable. This
limited warranty is valid only in the United States. This
limited warranty does not apply to: (1) any cost or
expense associated with shipping, accessing,
removing, installing or reinstalling the Product to obtain
warranty service, including, without limitation,
expenses related to remodeling or repairing any
flooring, cabinetry or the like; (2) periodic or routine
maintenance; (3) repair or replacement of the Product
or parts due to normal wear and tear; (4) defects or
damage to the Product or parts resulting from misuse,
abuse, neglect, or accidents; (5) defects or damage to
the Product or parts resulting from improper or
unauthorized alterations, modifications, or changes; (6)
any Product that has not been installed in accordance
with the instruction manual or technical instructions
provided by Manitowoc Ice; and (7) any Product that
has not been maintained, cleaned or sanitized in
accordance with the instruction manual or technical
instructions provided by Manitowoc Ice. To the extent
that warranty exclusions are not permitted under some
state laws, these limitations or exclusions may not
apply to you.
EXCEPT AS STATED IN THE FOLLOWING
SENTENCE, THIS LIMITED WARRANTY IS THE
SOLE AND EXCLUSIVE WARRANTY OF
MANITOWOC ICE 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.
11
IN NO EVENT SHALL MANITOWOC ICE OR ANY OF
ITS AFFILIATES BE LIABLE TO THE PURCHASER
OR ANY OTHER PERSON FOR ANY INCIDENTIAL,
CONSEQUENTIAL OR SPECIAL DAMAGES OF ANY
KIND ARISING FROM OR IN ANY MANNER
CONNECTED WITH THE PRODUCT, ANY BREACH
OF THIS LIMITED WARRANTY, OR ANY OTHER
CAUSE. 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.
This limited warranty gives the Purchaser specific legal
rights, and the Purchaser may also have rights that
vary from state to state or from one jurisdiction to
another. To obtain warranty service or information
regarding the Product, please contact us at:
MANITOWOC ICE, INC.
2110 So. 26th Street
P.O. Box 1720
Manitowoc, WI 54221-1720
Telephone: 800-235-9698
In order to obtain warranty service, the Purchaser must
present proof of purchase which shows that the
Purchaser was the original purchaser and that the
Product is within the warranty periods described
above.
To secure prompt and continuing warranty service, the
warranty registration card must be completed and sent
to Manitowoc Ice within thirty (30) days from the date
of purchase by the Purchaser. Complete the enclosed
registration card and send it to Manitowoc Ice at the
address shown above. Retain a copy for your record.
12
INSTALLATION
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.
• Air temperature: must be at least 50ºF (10ºC) but
must not exceed 110ºF (43ºC).
• 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.
Top/Sides 5" (127 mm)* 5" (127 mm)*
Back 5" (127 mm)* 5" (127 mm)*
Self-Contained
Air-Cooled
*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.
Self-Contained
Water-Cooled
13
ICE MACHINE HEAT OF REJECTION
Heat of Rejection*
Air Conditioning** Peak
1,145 2,300
* 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 helpful to know the
amount of heat rejected by the ice machine when
sizing air conditioning equipment where self-contained
air-cooled ice machines are installed.
14
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. Use a level to check the levelness of the ice
machine from front to back and from side to side.
2. If the ice machine is not level, adjust the leveling
glides or legs on each corner of the base of the ice
machine as necessary.
3. Check the levelness of the ice machine after each
adjustment.
4. Repeat steps 2 and 3 until the ice machine is level
from front to back and from side to side.
Levelers
Legs
15
WATER SERVICE/DRAINS
WATER SUPPLY
Local water conditions may require treatment of the
water to inhibit scale formation, filter sediment, and
remove chlorine odor and taste.
IMPORTANT
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.
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, 80 psig (5.5 bar) obtain a
water pressure regulator from your Manitowoc
distributor.
• Install a water shut-off valve for ice making potable
water.
• Insulate water inlet lines to prevent condensation.
• Local, state or city codes may require an air gap.
Contact a local plumber for code requirements.
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-inch drop per 5 feet 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.
16
WATER SUPPLY AND DRAIN LINE
SIZING/CONNECTIONS
Fitting
Ice Machine
Tubing Size Up to
Fitting
Ice Machine
Water
Pressure
Water
Temperature
diameter
min. inside
1/4" (.64 cm)
Tubing
ID Copper
1/4" (.64 cm)
80 psi (5.5 bar) Max
20 psi (1.38 bar) Min
35°F (1.7°C) Min.
90°F (32.°C) Max.
diameter
3/4" (1.9 cm)
minimum inside
3/4" (1.9 cm)
-----
-----.
3/8" (.96 cm) ID
Hose Barb
3/8" (.96 cm)
-----
-----
minimum
Hose
Water Inlet
Ice Making
Bin Drain
17
Drain Pump
Note: If air temperature is less than 60 F (15.5 C) water temperature must be equal or greater than 50°F (10°C).
ELECTRICAL REQUIREMENTS
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).
• A qualified electrician must determine proper
wire size dependent upon location, materials
used and length of run (minimum circuit
ampacity can be used to help select the wire
size).
• The maximum allowable voltage variation is
±10% of the rated voltage at ice machine
start-up (when the electrical load is highest).
• Check all green ground screws in the control
box and verify they are tight before starting
the ice machine.
MINIMUM CIRCUIT AMPACITY
The minimum circuit ampacity is used to help select
the wire size of the electrical supply. (Minimum circuit
ampacity is not the ice machine’s running amp load.)
ELECTRICAL SPECIFICATIONS
WARNING
The ice machine must be grounded in accordance
with national and local electrical code.
Ice
Machine
Voltage
Phase
Cycle
Max. Fuse/
Circuit
Breaker
CM50 115/1/60 15 amp 4.1
GFCI REQUIREMENTS
If GFCI (ground fault circuit interrupter) is required by
local electrical code, it must be a breaker type.
Minimum
Circuit
Amps
18
COMPONENT IDENTIFICATION
Cont rol P ane l
Evaporator
Compartment
Wa ter
Bin L ight
Shutter s
Wat er
Trou gh
Bin
Thermostat
Adjustment
Water
Bin
Electrical
Drain
Pu mp
Drain
Water Inlet
Ref rigeration
19
r
Not e: Evapor at or
removed f or
clarit y
Ev aporator
Bucket
Water S upply
Line
Spray Bar
Spray
Nozzles
Wa ter
Pump
Evaporato
Wa ter
Shutter
Water
Control
20
OPERATIONAL CHECKS
Routine adjustments and maintenance procedures
outlined in this manual are not covered by the warranty
WATER INLET VALVE
The water inlet valve energizes in the harvest cycle.
The water level will rise and flow out the overflow tube
and down the drain. Verify the overflow tube is in
place in the water trough. The water level is not
adjustable.
BIN THERMOSTAT ADJUSTMENT
The bin thermostat stops the ice machine when the bin
is full. Turn the thermostat to the left to decrease the
level of ice in bin or to the right to increase the level of
ice in bin.
POWER BUTTON (GREEN)
Pressing the “Power” button once will energize
the ice machine and green Power light. Pressing
the “Power” button a second time will de-energize
the ice machine.
CLEAN (GREEN)
Pressing the “Clean” button will initiate a clean
cycle. The clean light will flash during the clean
cycle for one minute to indicate the proper time to
add ice machine cleaner or sanitizer.
21
SAFETY TIMERS
The control board has the following nonadjustable safety timers:
• Initial cycle is 5 minutes longer than
subsequent cycles.
• The ice machine is locked into the freeze
cycle for 10 minutes (15 minutes initial
cycle) before a harvest cycle can be
initiated.
• The maximum freeze time is 120 minutes
at which time the control board
automatically initiates a harvest cycle
(step 4).
• The maximum harvest time is 5 minutes
at which time the control board
automatically start a freeze cycle
22
MAINTENANCE
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
WARNING
Disconnect electric power to the ice machine at
the electric service switch before cleaning the
condenser.
CAUTION
If you are cleaning the condenser fan blades with
water, cover the fan motor to prevent water
damage.
ONLY
CONDENSER
FIN COMB
COMB
DOWN
23
AIR-COOLED 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
air-cooled 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:
a) Blow compressed air through the condenser
fins from the inside. Be careful not to bend the
fan blades.
b) Use a commercial condenser coil cleaner.
Follow the directions and cautions supplied
with the cleaner.
4. Straighten any bent condenser fins with a fin
comb.
5. 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.
24
INTERIOR CLEANING AND SANITIZING
CAUTION
Use only Manitowoc approved Ice Machine
Cleaner (part number 000000084 clear metal
safe ice machine cleaner) 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
.
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
Wear rubber gloves and safety goggles (and/or
face shield) when handling Ice Machine Cleaner
or Sanitizer.
WARNING
Disconnect all electric power to the ice machine
before cleaning and sanitizing.
25
INTERIOR CLEANING AND SANITIZING
GENERAL
Perform an In Place Cleaning/Sanitizing procedure
monthly and a Cleaning/Sanitizing procedure every
12 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. An
extremely dirty ice machine must be taken apart for
cleaning and sanitizing.
CAUTION
Damage to the ice machine evaporator caused
by incorrect chemical usage is not covered by
the warranty. Use Manitowoc Ice Machine
Cleaner (part number 000000084) and Sanitizer
(part number 94-0565-3) only.
IN PLACE CLEANING/SANITIZING PROCEDURE
This procedure allows monthly in place cleaning of all
surfaces that come in contact with the water system.
The ice machine requires disassembly and
cleaning/sanitizing a minimum of once every 12
months. The quality of your potable water supply may
require more frequent cleaning intervals.
Use ice machine cleaner to remove lime scale or other
mineral deposits. Ice machine sanitizer disinfects and
removes algae and slime.
WARNING
Follow all labels and warnings on cleaner and
sanitizer bottles.
NOTE: All ice must be removed from the bin.
Step 1 Prepare 4 oz (1/2 cup) of undiluted Manitowoc
Ice Machine Cleaner (part number 000000084 only) in
a container that will fit easily under the lifted water
shutters.
26
Step 2 Press the clean switch. The ice machine will
initiate a 2 minute harvest to remove any remaining ice
from the evaporator.
Step 3 Remove all ice from the bin.
Step 4 Wait 3 minutes until the Clean light flashes,
then add the prepared Manitowoc Cleaner by lifting the
water shutters and pouring directly into the spray area.
Step 5 The ice machine will automatically time out a
ten minute cleaning cycle, followed by eight rinse
cycles, and stop. The Clean light will turn off to indicate
the clean cycle is complete. This entire cycle lasts
approximately 30 minutes.
Step 6 Prepare 1/2 oz (1 tablespoon) of undiluted
Manitowoc Ice Machine Sanitizer (part number 940565-3 only) in a container that will fit into the same
area.
Step 7 Press the Clean switch. Wait 3 minutes until the
Clean light flashes, then add the prepared Manitowoc
Sanitizer by lifting the water shutters and pouring
directly into the spray area. The ice machine will
automatically time out a ten minute sanitizing cycle,
followed by eight rinse cycles, and stop. The Clean
light will turn off to indicate the sanitizing cycle is
complete. This entire cycle lasts approximately 30
minutes.
NOTE: The ice machine will automatically continue
from the previous point before the clean cycle was
initiated.
A. If the ice machine was in the ice making
cycle, the control board will start ice making
again.
B. If the ice machine was in the off cycle, the
control board will turn off.
27
CLEANING PROCEDURE
Ice machine cleaner is used to remove lime scale and
other mineral deposits. Ice machine sanitizer disinfects
and removes algae and slime.
NOTE: All ice must be removed from the bin.
Step 1 Prepare 4 oz (1/2 cup) of undiluted Manitowoc
Ice Machine Cleaner (part number 000000084 only) in
a container that will fit easily under the lifted water
shutters. Refer to page 3-1 to identify the water
shutters.
Step 2 Press the Clean switch. The ice machine will
initiate a 2 minute harvest to remove any remaining ice
from the evaporator.
Step 3 Remove all ice from the bin.
Step 4 Wait 3 minutes until the Clean light flashes,
then add the prepared Manitowoc Cleaner by lifting the
water shutters and pouring directly into the spray area.
The ice machine will automatically time out a ten
minute cleaning cycle, followed by eight rinse cycles,
and stop. The Clean light will turn off to indicate the
clean cycle is complete. This entire cycle lasts
approximately 30 minutes.
Step 5 When the cleaning process stops, disconnect
power and remove all parts as described in Removal of
Parts for Cleaning and Sanitizing.
Step 6 Mix 16 oz (2 cups) cleaner with 2 gal of warm
water.
CAUTION
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.
28
Step 7 Take all removed components to a sink for
cleaning. Use 1/2 of the cleaner/water mixture 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 nylon brush, sponge
or cloth (NOT a wire brush) to carefully clean the parts.
Disassemble the spray bar, remove nozzles and
inserts and soak for 5 minutes. For heavily scaled
parts, soak in solution for 15 – 20 minutes. Rinse all
components with clean water.
Step 8 While components are soaking, use the other
1/2 of the cleaner/water solution and a nylon brush or
cloth to clean inside of ice bin. Clean inside of door,
door gasket, bin, top of evaporator and evaporator
bucket. Rinse all areas thoroughly with clean water.
Step 9 Mix 1 oz (2 tablespoons) sanitizer with 2 gal of
warm water.
Step 10 Use 1/2 of the sanitizer/water mixture 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/solution. Rinsing is not required.
Step 11 Use the other 1/2 of the sanitizer/water
solution and a sponge or cloth to sanitize the inside of
ice bin. Sanitize inside of door, door gasket, bin, top of
evaporator and evaporator bucket. Rinsing is not
required.
Step 12 Replace all removed components.
Step 13 Prepare 1/2 oz (1 tablespoon) of undiluted
Manitowoc Sanitizer.
Step 14 Reapply power to the ice machine, then press
the Clean switch.
29
Step 15 Wait 3 minutes until the Clean light flashes,
then add the prepared Manitowoc Sanitizer by lifting
the water shutters and pouring directly into the spray
area. The ice machine will automatically time out a ten
minute sanitizing cycle, followed by eight rinse cycles,
and stop. The Clean light will turn off to indicate the
sanitizing cycle is complete. This entire cycle lasts
approximately 30 minutes.
NOTE: The ice machine will automatically continue
from the previous point before the clean cycle was
initiated.
A. If the ice machine was in the ice making
cycle, the control board will start ice making
again.
B. If the ice machine was in the off cycle, the
control board will turn off.
30
REMOVAL OF PARTS FOR CLEANING AND
SANITIZING
TOP COVER
1. Remove two back screws.
2. Slide back and lift cover off.
WARNING
Disconnect electric power to the ice machine at
the electric switch box before proceeding.
31
WATER SHUTTERS
The water shutter is designed to keep the spraying
water from escaping the evaporator compartment.
To remove just the water shutters:
1. Grasp one end of the water shutter and lift up.
2. Pivot water shutter and disengage remaining
end.
3. To re-install into ice machine, grasp one end of
the water shutters, install one end, pivot the
opposite end and pull down into position. Make
sure tabs are secure in grooves.
To remove water shutter assembly:
1. Slide evaporator bucket forward 1/2” (13 mm).
2. Lift shutter assembly straight up.
Shutter
Assembly
Grasp Water
Water
Shutters
WARNING
Removing the water shutters while the water pump is
running will allow water to spray from ice machine.
Disconnect the electrical power to the ice machine at
the electric service switch box and turn off the water
supply.
32
ICE CHUTE
The ice chute is positioned over the spray nozzles and
allows the ice to easily fall into the bin. It must be firmly
positioned over the spray bar, with the front edge
inside the water trough. Spray nozzles must align with
the spray holes or spray water will fall into the bin.
1. Grab protruding spray hole on one end and lift
up and remove.
2. To re-install ice chute, grasp protruding spray
hole and position over Water Distribution
Assembly. Make sure rear supports are over
spray bar, and front edge is inside of water
trough.
33
SUMP DRAIN OVERFLOW TUBE
1. Remove clamp.
2. Pull down to remove overflow tube and tubing
as an assembly. The sump trough water will
drain into the bin.
3. Remove overflow tube from vinyl tubing by
pulling.
Remove Clamp
&
Pull Down
34
WATER TROUGH
1. Depress tabs on right and left side of the water
trough.
2. Allow front of water trough to drop as you pull
forward to disengage the rear pins.
35
SPRAY BAR, WATER PUMP AND HOSE
WARNING
Disconnect the electric power to the ice machine at the
electric service switch box and turn off the water supply
before proceeding.
Remove spray bar clamp and spray bar.
1. Grasp pump and pull straight down until water
pump disengages and electrical connector is
visible.
2. Disconnect the electrical connector.
3. Remove the water pump from ice machine.
4. Remove clamp from hose to remove from pump.
5. Do not submerse the water pump motor in
cleaner or sanitizer. If soaking is required,
immerse pump to normal water level during the
freeze.
Remove
Clamp
DO NOT
Immerse Motor
in Solution
Maximum
Solution Height
When Soaking
Remove
Clamp
36
SPRAY BAR DISASSEMBLY
The spray bar supplies water to the individual ice
making cups. Water from the water pump sprays
through the nozzles, located on the upper portion of
the tubes.
1. Grasp one end of the spray bar, lift up and
remove from seat formed in evaporator bucket.
2. Remove clamp on water inlet tubing by grasping
both ears on clip and separating.
3. Apply food grade lubricant to ease re-assembly
of spray bar components when necessary.
4. To re-install spray bar, position water inlet
tubing on inlet ports, and squeeze clips until
tight.
5. Reposition assembly on water trough seat.
Nozzles and inserts can be removed for
cleaning by unscrewing nozzles. Inserts are
located inside the spray bar ports. The spray bar
also disassembles for easy cleaning.
Remove
Clamp
37
REMOVAL FROM SERVICE/LONG TERM
STORAGE/WINTERIZATION
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.
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.
Follow the applicable procedure below.
SELF-CONTAINED AIR-COOLED ICE MACHINES
1. Perform a cleaning and sanitizing procedure to
prevent mildew growth.
2. Disconnect the electric power at the circuit breaker
or the electric service switch.
3. Turn off the water supply.
4. Remove the water from the water trough.
5. Disconnect and drain the incoming ice-making
water line at the rear of the ice machine.
6. 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.
7. Make sure water is not trapped in any of the water
lines, drain lines, distribution tubes, etc.
8. Block the door partially open to provide air
exchange and prevent mildew growth.
38
ICE MAKING SEQUENCE OF
OPERATION
Depending on ambient conditions and cold water
supply temperature, the ice making process will take
approximately 30 minutes.
1. Initial Start-Up or Start-Up After Automatic
Shut-Off — Water Fill
Before the compressor starts, the water inlet valve
will energize to purge old water from the system
for about 3 minutes.
2. Refrigeration System Start-Up
The compressor starts after the Water Fill cycle
and remains on throughout the Freeze and
Harvest cycles. The condenser fan motor starts
and runs throughout the Freeze cycle.
3. Freeze
The water pump sprays water into the inverted
cups. The water freezes layer by layer, until an ice
cube forms in each cup. The control system will
adjust the length of the Freeze cycle to conditions.
4. Harvest
The water pump shuts off and the water inlet valve
starts up to assist harvest and refill the water
sump. The evaporator is warmed, allowing the
cubes to release from the evaporator and drop into
the storage bin. The control system will adjust the
length of the Harvest cycle to conditions and
regulate whether the condenser fan will run.
At the end of the Harvest cycle, the ice machine
will start another Freeze cycle (Step 3).
5. Automatic Shut-Off
The level of ice in the storage bin controls the ice
machine shut-off. When the bin is full, ice will
contact the bin thermostat bulb holder. The bin
thermostat bulb cools, which stops the ice
machine. The ice machine remains off until ice no
longer contacts the bin thermostat bulb holder and
the thermostat bulb warms up. The increase in
temperature will restart the ice machine (step 1).
39
ENERGIZED PARTS CHART
re
closes
SELF-CONTAINED ICE MACHINES
Length of
3
2
Control Board Relays
175
“ON” Time
off
Fan Motor
Water Pump
on
Hot GasValve
Water Fill Valve
1
Compressor
off
5
seconds
seconds
on
on
on
determined
Automatically
on
off
on
determined
Automatically
off
on
on
-
Until bin
thermostat
off
off
off
OPERATION
ICE MAKING
SEQUENCE OF
Initial Start-Up
1. WaterFill
2. Refrigeration System
Startup
3. Freeze Cycle
40
4. Harvest Cycle
5. Auto-Shut-Off
TROUBLESHOOTING
DIAGNOSING AN ICE MACHINE THAT WILL
NOT RUN
WARNING
High (line) voltage is applied to the control board
(terminals #20 and #21) at all times. Removing
control board fuse or moving the toggle switch to
OFF will not remove the power supplied to the
control board.
1. Verify primary voltage is supplied to ice machine.
2. Verify that the fuse or circuit breaker is closed and
the ice machine is plugged into a receptacle.
3. Verify control board fuse is OK.
4. Verify the transformer is supplying power to the
control board.
• If the interior light functions or the red control
board light is energized the transformer is OK.
• If the transformer is supplying power to the
control board and the red control board light
will not energize, replace the control board.
41
5. Verify the “Power” switch functions properly.
• If the red control board light is energized and
depressing the “Power” switch does not
energize the green “Power” light, check the
interconnecting wire, then replace the
interface board.
6. Verify the bin thermostat functions properly.
• The green “Power” light will be energized and
the ice machine will function in the “Clean”
cycle with the bin thermostat is open.
7. Check control board light to see if ice machine
shutdown on over temperature limit (control board
light will flash rapidly).
8. Replace the control board.
• Be sure Steps 1-6 were followed thoroughly.
Intermittent problems are not usually related
to the control board.
42
ICE MACHINE WILL NOT HARVEST
1. Verify cubes are present in evaporator and freeze
time exceeds freeze chart cycle time.
• Initial freeze cycle after resetting at toggle
switch will be 5 minutes longer than chart time
(refer to Sequence of Operation).
• Verify control board is not set for additional
freeze time to fill out the ice cubes, see cube
weight adjustment.
2. Observe control board light:
• Steady light indicates thermistor operation is
normal.
• Slow flash indicates a thermistor problem
(open or disconnected). Verify liquid line
thermistor is connected to control board,
securely attached to liquid line and insulated.
Refer to resistance chart and Ohm thermistor.
• Rapid flash indicates liquid line temperature
exceeded 170°F (refer to discharge pressure
high checklist). If unable to determine cause,
refer to resistance chart and Ohm thermistor.
3. Reset ice machine.
• Wait freeze cycle time plus an addition 5
minutes (refer to Sequence of Operation).
4. Verify the water inlet valve is energized during the
entire harvest cycle and water flow is normal.
• Although the hot gas valve is energized, the
ice machine will not consistently harvest if the
water inlet valve does not energize or has low
water flow.
5. Check for power at the hot gas valve
• Power is present - replace coil/valve.
• No power at hot gas valve - check for power
at circuit board connector, replace control
board if no power is present.
43
ICE QUALITY IS POOR – CUBES ARE
SHALLOW, INCOMPLETE OR WHITE
Problem
• Cause
Ice machine is dirty
• Clean and sanitize the ice machine
Water filtration is poor
• Replace the filter
Water softener is working improperly (if
applicable)
• Repair the water softener
Poor incoming water quality
• Contact a qualified company to test the quality of
the incoming water and make appropriate filter
recommendations
Water escaping from sump during freeze cycle
• Check standpipe and drain
• Check for water tracking out of water circuit
44
FREEZE CYCLE IS LONG, LOW ICE
PRODUCTION
Problem
• Cause
Water temperature is too high
• Connect to a cold water supply, verify check
valves in faucets and other equipment are
functioning correctly
Dirty Condenser
• Clean condenser
High air temperature entering condenser
• Air temperature must not exceed 120°F (39°C)
Water inlet valve filter screen is dirty
• Remove the water inlet valve and clean the filter
screen
Water inlet valve stuck open or leaking
• Turn off ice machine, if water continues to enter
ice machine, verify water pressure is ok then
replace water inlet valve
Water inlet valve is not working
• Water inlet valve must be replaced
Refrigeration problem
• Refer to refrigeration diagnostics
Water escaping from sump during freeze cycle
• Check standpipe and drain
• Check for water tracking out of water circuit
45
ICE MACHINE RUNS & NO ICE IS PRODUCED
Problem
• Cause
No water to ice machine
• Correct water supply
Incorrect incoming water pressure
• Water pressure must be 20-80 psi (1.4-5.5 bar)
Spray nozzle is blocked with mineral buildup
• Clean and sanitize the ice machine
Ambient temperature is too high or low
• Ambient temperature must be between 50°F and
110°F (10°C and 43°C)
Thermistor Disconnected or Open
• Refer to thermistor diagnostics
46
ANALYZING DISCHARGE PRESSURE
1. Determine the ice machine operating conditions:
Air temp. entering condenser ______
Air temp. around ice machine ______
Water temp. entering sump trough______
2. Refer to Cycle Times/24 Hour Ice
Production/Refrigeration Pressure Chart for ice
machine being checked.
Use the operating conditions determined in Step 1 to
find the published normal discharge pressures.
Freeze Cycle ______
Harvest Cycle______
3. Perform an actual discharge pressure check.
Beginning
of Cycle
Middle of
Cycle
End of
Cycle
Freeze
Cycle PSIG
__________ __________
__________ __________
__________ __________
Harvest
Cycle PSIG
4. Compare the actual discharge pressure (Step 3)
with the published discharge pressure (Step 2).
The discharge pressure is normal when the actual
pressure falls within the published pressure range for
the ice machine’s operating conditions. It is normal for
the discharge pressure to be higher at the beginning of
the freeze cycle (when load is greatest), then drop
through out the freeze cycle.
47
DISCHARGE PRESSURE HIGH CHECKLIST
Problem
• Cause
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Restricted Condenser Air Flow
• High inlet air temperature
• Condenser discharge air re-circulation
• Dirty condenser fins
• Defective fan motor
Improper Refrigerant Charge
• Overcharged
• Non-condensable in system
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component restricted
(before mid-condenser)
FREEZE CYCLE DISCHARGE PRESSURE LOW
CHECKLIST
Problem
• Cause
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component restricted
(after condenser)
• Ambient temperature too low
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
48
ANALYZING SUCTION PRESSURE
The suction pressure gradually drops throughout the
freeze cycle. The actual suction pressure (and drop
rate) changes as the air and water temperature
entering the ice machine changes. These variables
also determine the freeze cycle times.
To analyze and identify the proper suction pressure
drop throughout the freeze cycle, compare the
published suction pressure to the published freeze
cycle time.
NOTE: Analyze discharge pressure before analyzing
suction pressure. High or low discharge pressure may
be causing high or low suction pressure.
49
PROCEDURE
Step
1. Determine the ice
machine operating
conditions.
2A. Refer to “Cycle Time”
and “Operating Pressure”
charts for ice machine
model being checked.
Using operating conditions
from Step 1, determine
published freeze cycle time
and published freeze cycle
suction pressure.
2B. Compare the published
freeze cycle time and
published freeze cycle
suction pressure. Develop a
chart.
3. Perform an actual suction
pressure check at the
beginning, middle and end
of the freeze cycle. Note the
times at which the readings
are taken.
4. Compare the actual
freeze cycle suction
pressure (Step 3) to the
published freeze cycle time
and pressure comparison
(Step 2B). Determine if the
suction pressure is high,
low or acceptable.
Air temp. entering condenser:
90°F/32.2°C
Air temp. around ice machine:
80°F/26.7°C
Water temp. entering water fill valve:
70°F/21.1°C
19.1 - 21.7 minutes
Published freeze cycle time:
20-3 PSIG
Published freeze cycle
suction pressure:
1 5 10 15 20
Published Freeze Cycle Time
(minutes)
20 16 12 8 3
.
Published Freeze Cycle Suction
In the example, the proper suction
Pressure should be approximately 16
PSIG at 5 minutes; 12 PSIG at 10
Minutes; etc.
Manifold gauges were connected to the
example ice machine and suction pressure
readings taken as follows: PSIG
Beginning of Freeze cycle:
30 (at 1 min.)
Middle of freeze cycle:
22 (at 10 min.)
End of freeze cycle:
8 (at 20 min.)
In this example, the suction pressure is
considered high throughout the freeze
cycle. It should have been:
Approximately 20 PSIG
(at 1 minute) – not 30
Approximately 12 PSIG
(at 10 minutes) – not 22
Approximately – 3 PSIG
(at 20 minutes) – not 8
Pressure (psig)
50
SUCTION PRESSURE HIGH CHECKLIST
Problem
• Cause
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Discharge Pressure
• Discharge pressure is too high, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure High Checklist”
Improper Refrigerant Charge
• Overcharged
• Wrong type of refrigerant
• Non Condensable in system
Other
• Non-Manitowoc components in system
• Hot gas valve leaking
• Defective compressor
• Water inlet valve leaking
SUCTION PRESSURE LOW CHECKLIST
Problem
• Cause
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Discharge Pressure
• Discharge pressure is too low, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure Low Checklist”
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• Improper water supply over evaporator refer to
“Water System Checklist”
• Loss of heat transfer from tubing on back side of
evaporator
• Restricted/plugged liquid line drier
• Restricted/plugged tubing in suction side of
refrigeration system
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
51
HOT GAS VALVE
General
The hot gas valve is an electrically operated valve that
opens when energized, and closes when de-energized.
Normal Operation
The valve is de-energized (closed) during the freeze
cycle and energized (open) during the harvest cycle.
The valve is positioned between the receiver and the
evaporator and performs two functions:
1. Prevents refrigerant from entering the evaporator
during the freeze cycle.
The hot gas valve is not used during the freeze
cycle. The hot gas valve is de-energized (closed)
preventing refrigerant flow from the receiver into
the evaporator.
2. Allows refrigerant vapor to enter the evaporator in
the harvest cycle.
During the harvest cycle, the hot gas valve is
energized (open) allowing refrigerant gas from the
discharge line of the compressor to flow into the
evaporator. The heat is absorbed by the
evaporator and allows release of the ice slab.
Exact pressures vary according to ambient
temperature. Harvest pressures can be found in the
“Cycle Time/24 Hour Ice Production/ Refrigerant
Pressure Charts in this book.
52
HOT GAS VALVE ANALYSIS
The valve can fail in two positions:
• Valve will not open in the harvest cycle.
• Valve remains open during the freeze cycle.
Valve will not open in the harvest cycle
Although the circuit board has initiated a harvest cycle,
the evaporator temperature remains unchanged from
the freeze cycle.
Valve remains open in the freeze cycle:
Symptoms are dependent on the amount of leakage in
the freeze cycle. A small amount of leakage will cause
increased freeze cycle times. A large amount of
leakage will result in no ice produced.
Use the following procedure and table to help
determine if a hot gas valve is remaining partially open
during the freeze cycle.
1. Wait five minutes into the freeze cycle.
1. Feel the inlet of the hot gas valve(s).
IMPORTANT
Feeling the hot gas valve outlet or across the hot
gas valve itself will not work for this comparison.
The hot gas valve outlet is on the suction side (cool
refrigerant). It may be cool enough to touch even if
the valve is leaking.
WARNING
The inlet of the hot gas valve and the compressor
discharge line could be hot enough to burn your
hand. Just touch them momentarily
2. Feel the compressor discharge line.
3. Compare the temperature of the inlet of the hot
gas valves to the temperature of the compressor
discharge line.
53
EXAMPLES OF HOT GAS VALVE
INLET/COMPRESSOR DISCHARGE LINE
TEMPERATURE COMPARISON
Findings Comments
The inlet of the
hot gas valve is
cool enough to
touch and the
compressor
discharge line is
hot.
The inlet of the
hot gas valve is
hot and
approaches the
temperature of
a hot
compressor
discharge line.
This is normal as the discharge
line should always be too hot to
touch and the hot gas valve
inlet, although too hot to touch
during harvest, should be cool
enough to touch after 5 minutes
into the freeze cycle.
This is an indication something
is wrong, as the hot gas valve
inlet did not cool down during
the freeze cycle. If the
compressor dome is also
entirely hot, the problem is not
a hot gas valve leaking, but
rather something causing the
compressor (and the entire ice
machine) to get hot.
Both the inlet of
the hot gas
valve and the
compressor
discharge line
are cool enough
This is an indication something
is wrong, causing the
compressor discharge line to
be cool to the touch. This is not
caused by a hot gas valve
leaking.
to touch.
54
BIN THERMOSTAT
Function
The bin thermostat stops the ice machine when the bin
is full.
The level of ice in the ice storage bin controls the ice
machine shut-off. When the bin is full, ice cubes
contact the bin thermostat bulb holder, which cools
down and opens the bin thermostat to stop the ice
machine. The ice machine remains off until enough ice
has been removed from the bin. This causes the
thermostat bulb holder to warm and closes the bin
thermostat, restarting the ice machine.
Specifications
Control Setting
Bin Thermostat
Cut in: 34°F (4.5°C)
Cut out: 33.8°F (1.0°C)
55
Check Procedure
WARNING
High (line) voltage is applied to the control board
(terminals #20 and #21) at all times. Removing
the control board fuse or depressing the power
button will not remove the power supplied to the
control board.
WARNING
Disconnect electrical power to the entire ice
machine before proceeding.
1. Verify the capillary tube is inserted correctly in the
bulb holder (17” 43 cm).
2. Remove the 2 bottom front panels to access the
bin thermostat.
3. Disconnect wires #45 and #46 from the bin
thermostat or control board and check the
resistance across the bin thermostat terminals.
No Ice on
Ice on Bulb Result
Bulb
Closed (O) Open (OL)
Open (OL) Closed (O)
Thermostat
good
Replace
thermostat
Note: After covering/uncovering the bulb holder with
ice, wait at least three minutes to allow the
thermostat to react. (Open/Close)
56
ICE PRODUCTION CHECK
The amount of ice a machine produces directly relates to
the operating water and air temperatures. This means an
ice machine with a 70°F (21.2°C) ambient temperature
and 50°F (10.0°C) water produces more ice than the same
ice machine with 90°F (32.2°C) ambient and 70°F (21.2°C)
water.
1. Determine the ice machine operating conditions:
Air temp entering condenser:____°
Air temp around ice machine:____°
Water temp entering sump trough:____°
2. Refer to the appropriate 24-Hour Ice Production
Chart. Use the operating conditions determined in
Step 1 to find published 24 hr. ice production:____
Times are in minutes.
Example: 1 min., 15 sec. converts to 1.25 min.
(15 seconds ÷ 60 seconds = .25 minutes)
Weights are in pounds.
Example: 2 lb., 6 oz. converts to 2.375 lb.
(6 oz. ÷16 oz. = .375 lb.)
3. Perform an ice production check using the formula
below.
1. _______ + _______ = _______
Freeze Time Harvest Time Total Cycle Time
2. 1440 ÷ _______ = _______
Mins in 24 hrs Total Cycle Time Cycles Per Day
3. _______ x _______ = _______
Weight of One Cycles Per Day Actual 24 Hr
Harvest Production
4. Compare the results of Step 3 with Step 2. Ice
production is normal when these numbers match
closely. If they match closely, determine if:
Another larger ice machine is required.
Relocating the existing equipment to lower the
load conditions is required.
57
ADJUSTING CUBE WEIGHT
The cube weight can be increased from the factory
setting by adjusting the finish time.
Additional finishing time check:
Press and hold the power button for 5 seconds.
• Count the flashes on the Automatic Ice
Making light. The light will flash once for each
additional minute of freeze cycle time.
Adjusting Finishing Time
Adjust in 1-minute increments and allow the ice
machine to run several freeze/harvest cycles, and then
inspect the ice cubes. If a heavier cube weight is
desired add another minute of freeze time and repeat
the process.
Press and hold the power button.
• Press and release the clean button once for
each additional minute of freeze cycle time
desired.
Five minutes is the maximum additional freeze time
that can be added. Pressing the clean button 6 times
will reset the finishing time to zero additional minutes.
58
LIQUID LINE THERMISTOR
Function
The liquid line thermistor senses the refrigeration
system liquid line temperature. This is used in
conjunction with the control board to determine the
length of the freeze and harvest cycles.
Specifications
10,000 Ohms ± 2% at 25°C (77°F)
CAUTION
Use only Manitowoc thermistors.
Check Procedure
Verify that the thermistor resistance is accurate and
corresponding to the high and low temperature ranges.
1. Disconnect the thermistor at the control board.
Connect the ohmmeter to the isolated thermistor
wire leads.
2. Using a temperature meter capable of taking
readings on curved copper lines, attach the
temperature meter-sensing device to the liquid line
next to the thermistor aluminum block.
IMPORTANT
Do not simply “insert” the sensing device under the
insulation. It must be attached to and reading the
actual temperature of the copper liquid line.
3. With the ice machine running, verify that the
temperature of the discharge line (step 2)
corresponds to the thermistor resistance reading
as stated in the temperature/resistance
(step 1)
chart.
59
TEMPERATURE/RESISTANCE CHART
As the temperature rises at the thermistor block, the
resistance drops.
IMPORTANT
If the ohmmeter reads “OL,” check the scale
setting on the meter before assuming the
thermistor is bad.
SM50 Resistance Chart
Temperature of Thermistor Resistance
°C °F
15.6° - 21.1° 60° - 70°
21.1° - 26.7° 70° - 80°
26.7° - 32.2° 80° - 90°
32.2° - 37.8° 90° - 100°
37.8° - 43.3° 100° - 110°
43.3° - 48.9° 110° - 120°
48.9° - 54.4° 120° - 130°
54.4° - 60.0° 130° - 140°
60.0° - 65.6° 140° - 150°
65.6° - 71.1° 150° - 160°
71.1° - 76.7° 160° - 170°
76.7° - 82.2° 170° - 180°
82.2° - 87.8° 180° - 190°
87.8° - 93.3° 190° - 200°
93.3° - 98.9° 200° - 210°
100° 212°
(boiling water bath)
104.4° - 110.0° 220° - 230°
110.0° - 115.6° 230° - 240°
115.6° - 121.1° 240° - 250°
121.1° - 126.7° 250° - 260°
K Ohms (x 1000)
15.31 - 11.88
11.88 - 9.29
9.29 - 7.33
7.33 - 5.82
5.82 - 4.66
4.66 - 3.75
3.75 - 3.05
3.05 - 2.49
2.49 - 2.04
2.04 - 1.68
1.68 - 1.40
1.40 - 1.17
1.17 - 0.98
0.98 - 0.82
0.82 - 0.70
0.73 - 0.62
0.59 - 0.51
0.51 - 0.43
0.43 - 0.37
0.37 - 0.33
60
TOTAL SYSTEM REFRIGERATION CHARGE
IMPORTANT
This information is for reference only. Refer to the
ice machine serial number tag to verify the system
charge. Serial plate information overrides
information listed on this page.
Model Refrigerant
Charge (grams)
CM50
Air Cooled
160 R-134A
Refrigerant
Type
61
COMPONENT SPECIFICATIONS AND
CHECK PROCEDURES
MAIN FUSE
Function
The control board fuse stops ice machine operation if
electrical components fail causing high amp draw.
Specifications
Volt Amp
CM50 250 10
Check Procedure
WARNING
High (line) voltage is applied to the control
board 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.
1. If the bin switch light is on with the ice damper
closed, the fuse is good.
WARNING
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
62
COMPRESSOR ELECTRICAL DIAGNOSTICS
The compressor does not start or will trip repeatedly on
overload.
CHECK RESISTANCE (OHM) VALUES
NOTE: Compressor windings can have very low ohm
values. Use a properly calibrated meter.
Perform the resistance test after the compressor cools.
The compressor dome should be cool enough to touch
(below 120°F/49°C) to assure that the overload is
closed and the resistance readings will be accurate.
SINGLE PHASE COMPRESSORS
1. Disconnect power from the condensing unit and
remove the wires from the compressor terminals.
2. The resistance values between C and S and
between C and R, when added together should
equal the resistance value between S and R.
3. If the overload is open, there will be a resistance
reading between S and R, and open readings
between C and S and between C and R. Allow the
compressor to cool, then check the readings
again.
CHECK MOTOR WINDINGS TO GROUND
Check continuity between all three terminals and the
compressor shell or copper refrigeration line. Scrape
metal surface to get good contact. If continuity is
present, the compressor windings are grounded and
the compressor should be replaced.
To determine if the Compressor is seized check the
amp draw while the compressor is trying to start.
63
COMPRESSOR DRAWING LOCKED ROTOR
The two likely causes of this are:
• Defective starting component
• Mechanically seized compressor
To determine which you have:
• Install high and low side gauges.
• Try to start the compressor.
• Watch the pressures closely.
If the pressures do not move, the compressor is
seized. Replace the compressor.
If the pressures move, the compressor is turning slowly
and is not seized. Check the capacitors and relay.
COMPRESSOR DRAWING HIGH AMPS
The continuous amperage draw on start-up should not
be near the maximum fuse size indicated on the serial
tag.
The wiring must be correctly sized to minimize voltage
drop at compressor start-up. The voltage when the
compressor is trying to start must be within ±10% of
the nameplate voltage.
64
DIAGNOSING START COMPONENTS:
If the compressor attempts to start, or hums and trips
the overload protector, check the start components
before replacing the compressor.
CAPACITOR
Visual evidence of capacitor failure can include a
bulged terminal end or a ruptured membrane. Do not
assume a capacitor is good if no visual evidence is
present. A good test is to install a known good
substitute capacitor. Use a capacitor tester when
checking a suspect capacitor. Clip the bleed resistor off
the capacitor terminals before testing.
RELAY
The relay has a set of contacts that connect and
disconnect the start capacitor from the compressor
start winding. The contacts on the relay are normally
open. The relay senses the voltage generated by the
start winding and closes and then opens the contacts
as the compressor motor starts. The contacts remain
open until the compressor is de-energized.
65
CYCLE TIMES, 24 HR ICE
PRODUCTION AND REFRIGERANT
PRESSURE CHARTS
These charts are used as guidelines to verify correct
ice machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
• Refer to “OPERATIONAL ANALYSIS CHART” for
the list of data that must be collected for
refrigeration diagnostics. This list includes: before
beginning service, ice production check,
installation/visual inspection, water system
checklist, ice formation pattern, safety limits,
comparing evaporator inlet/outlet temperatures,
hot gas valve analysis, discharge and suction
pressure analysis.
• Ice production checks that are within 10% of the
chart are considered normal. This is due to
variances in water and air temperature. Actual
temperatures will seldom match the chart exactly.
• Zero out manifold gauge set before obtaining
pressure readings to avoid misdiagnosis.
• Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are
within the range indicated.
66
NOTE: THESE CHARACTERISTICS MAY
VARY DEPENDING ON OPERATING
CONDITIONS.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
AIR TEMP.
ENTERING
CONDENSER °F/°C
70/21.1 15.6-17.8 15.3-17.4 15.6-17.8
80/26.7 16.6-18.9 17.0-19.4 17.4-19.8
90/32.2 17.4-19.8 19.1-21.7 18.2-20.7
100/37.8 19.2-22.1 19.8-22.7 22.4-25.4
110/43.3 24.9-28.2 25.7-29.1 31.4-35.5
Times in minutes
FREEZE TIME
WATER TEMPERATURE °F/°C
50/10.0 70/21.1 90/32.2
HARVEST
TIME
1.0-3.5
24 Hour Ice Production
AIR TEMP. ENTERING
CONDENSER °F/°C
70/21.1 53 54 53
80/26.7 50 49 48
90/32.2 48 44 46
100/37.8 40 39 38
110/43.3 35 34 28
Based on the average weight of 1 harvest cycle 0.63 – 0.71 lb.
Nominal Individual Cube Weight 0.70 ounces
Cubes Per Harvest Cycle 16
WATER TEMPERATURE °F/°C
50/10.0 70/21.1 90/32.2
Operating Pressures
ENTERING
CONDENSER
°F/°C
50/10.0 125-70 18-0 50-75 20-55
70/21.1 135-95 18-0 65-85 35-60
80/26.7 165-115 19-2 75-100 40-70
90/32.2 195-135 20-3 85-120 40-70
100/37.8 235-165 24-5 100-135 50-80
110/43.3 255-185 28-7 110-155 50-90
Suction pressure drops gradually throughout the freeze cycle
FREEZE CYCLE HARVEST CYCLE AIR TEMP.
DISCHARGE
PRESSURE
PSIG
SUCTION
PRESSURE
PSIG
DISCHARGE
PRESSURE
PSIG
SUCTION
PRESSURE
PSIG
67
REFRIGERANT DEFINITIONS
Recover
To remove refrigerant, in any condition, from a system
and store it in an external container, without
necessarily testing or processing it in any way.
Recycle
To clean refrigerant for re-use by oil separation and
single or multiple passes through devices, such as
replaceable core filter-driers, which reduce moisture,
acidity and particulate matter. This term usually applies
to procedures implemented at the field job site or at a
local service shop.
Reclaim
To reprocess refrigerant to new product specifications
(see below) by means which may include distillation. A
chemical analysis of the refrigerant is required after
processing to be sure that product specifications are
met. This term usually implies the use of processes
and procedures available only at a reprocessing or
manufacturing facility.
Chemical analysis is the key requirement in this
definition. Regardless of the purity levels reached by a
reprocessing method, refrigerant is not considered
“reclaimed” unless it has been chemically analyzed
and meets ARI Standard 700 (latest edition).
New Product Specifications
This means ARI Standard 700 (latest edition).
Chemical analysis is required to assure that this
standard is met.
68
REFRIGERANT RE-USE POLICY
Manitowoc recognizes and supports the need for
proper handling, re-use, and disposal of, CFC and
HCFC refrigerants. Manitowoc service procedures
require recapturing refrigerants, not venting them to the
atmosphere.
It is not necessary, in or out of warranty, to reduce or
compromise the quality and reliability of your
customers’ products to achieve this.
IMPORTANT
Manitowoc Ice, Inc. assumes no responsibility for
use of contaminated refrigerant. Damage resulting
from the use of contaminated, recovered, or
recycled refrigerant is the sole responsibility of the
servicing company.
Manitowoc approves the use of:
1. New Refrigerant
• Must be of original nameplate type.
2. Reclaimed Refrigerant
• Must be of original nameplate type.
• Must meet ARI Standard 700 (latest edition)
specifications.
3. Recovered or Recycled Refrigerant
• Must be recovered or recycled in accordance
with current local, state and federal laws.
• Must be recovered from and re-used in the
same Manitowoc product. Re-use of recovered
or recycled refrigerant from other products is not
approved.
• Recycling equipment must be certified to ARI
Standard 740 (latest edition) and be maintained
to consistently meet this standard.
69
4. Recovered refrigerant must come from a
“contaminant-free” system. To decide whether the
system is contaminant free, consider:
• Type(s) of previous failure(s)
• Whether the system was cleaned, evacuated
and recharged properly following failure(s)
• Whether the system has been contaminated
by this failure
• Compressor motor burnouts and improper
past service prevent refrigerant re-use.
• Refer to “System Contamination Cleanup” to
test for contamination.
5. “Substitute” or “Alternative” Refrigerant
• Must use only Manitowoc-approved alternative
refrigerants.
• Must follow Manitowoc-published conversion
procedures.
70
Refrigerant Recovery/Evacuation/Charging
Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer’s recommendations.
Install and uninstall your manifold gauge set correctly
to prevent refrigerant loss.
IMPORTANT
Manitowoc Ice, Inc. assumes no responsibility for
the use of contaminated refrigerant. Damage
resulting from the use of contaminated
refrigerant is the sole responsibility of the
servicing company.
IMPORTANT
Replace the liquid line drier before evacuating
and recharging. Use only a Manitowoc (O.E.M.)
liquid line filter drier to prevent voiding the
warranty.
Connections
• Suction side of the compressor through the
suction access fitting.
• Discharge side of the compressor through the
discharge access fitting.
IMPORTANT
Purge system with nitrogen while brazing to
prevent build up of copper oxide in the
refrigeration system.
71
IMPORTANT
Manifold gauges must be removed properly to
ensure that no refrigerant contamination or loss
occurs. A quick disconnect is required for the
high side connection.
Recovery/Evacuation
1. Place the toggle switch in the OFF position.
2. Install manifold gauges, charging scale, and
recovery unit or two-stage vacuum pump.
3. Open the high and low side valves on manifold
gauges.
4. Perform recovery or evacuation:
A. Recovery: Operate the recovery unit as
directed by the manufacturer’s instructions.
B. Perform a nitrogen pressure test to verify
leaks are not present.
C. Evacuation prior to recharging: Pull the
system down to 500 microns.
NOTE: Check access fittings for leaks with an
electronic leak detector after charging the ice machine.
72
Charging Procedures
IMPORTANT
The charge is critical on all Manitowoc ice
machines. Use a scale to ensure the proper
charge is installed. A quick disconnect is required
for the high side connection
1. Be sure the toggle switch is in the OFF position.
2. Close the vacuum pump valve and the low side
manifold gauge valve.
3. Open the high side manifold gauge valve.
4. Using a digital scale add the proper refrigerant
charge (shown on nameplate) through the high
side.
5. Close/isolate the refrigerant cylinder.
6. Let the system “settle” for 2 to 3 minutes.
7. Place the toggle switch in the ICE position.
8. Close the high side on the manifold gauge set.
NOTE: Manifold gauges must be removed properly to
ensure that no refrigerant contamination or loss occurs.
A quick disconnect is required for the high side
connection.
73
9. Make sure that all refrigerant in the charging hose
is drawn into the ice machine before disconnecting
the manifold gauge set.
A. Drain the water from the sump trough.
B. Run the ice machine in the freeze cycle for 5
minutes.
C. Remove the high side hose with the quick
disconnect.
D. Open the high and low side valves on the
manifold gauge set. Any refrigerant in the
lines will be pulled into the low side of the
system.
E. Allow the suction pressure to reach 0 psig
while the ice machine is in the freeze cycle.
F. Remove the low side hose.
74
SYSTEM CONTAMINATION CLEANUP
GENERAL
This section describes the basic requirements for
restoring contaminated systems to reliable service.
IMPORTANT
Manitowoc Ice, Inc. assumes no responsibility for
the use of contaminated refrigerant. Damage
resulting from the use of contaminated refrigerant
is the sole responsibility of the servicing company.
Determining Severity Of Contamination
System contamination is generally caused by either
moisture or residue from compressor burnout entering
the refrigeration system.
Inspection of the refrigerant usually provides the first
indication of system contamination. Obvious moisture
or an acrid odor in the refrigerant indicates
contamination.
If either condition is found, or if contamination is
suspected, use a Total Test Kit from Totaline or a
similar diagnostic tool. These devices sample
refrigerant, eliminating the need to take an oil sample.
Follow the manufacturer’s directions.
If a refrigerant test kit indicates harmful levels of
contamination, or if a test kit is not available, inspect
the compressor oil.
1. Remove the refrigerant charge from the ice
machine.
2. Remove the compressor from the system.
3. Check the odor and appearance of the oil.
4. Inspect open suction and discharge lines at the
compressor for burnout deposits.
5. If no signs of contamination are present, perform
an acid oil test to determine the type of cleanup
required.
75
Contamination/Cleanup Chart
Symptoms/Findings Required Cleanup
Procedure
No symptoms or suspicion
of contamination
evacuation/recharging
Normal
procedure
Moisture/Air Contamination
symptoms Refrigeration
Mild contamination
cleanup procedure
system open to atmosphere
for longer than 15 minutes
Refrigeration test kit and/or
acid oil test shows
contamination
No burnout deposits in
open compressor lines
Mild Compressor Burnout
symptoms
Mild contamination
cleanup procedure
Oil appears clean but
smells acrid
Refrigeration test kit or acid
oil test shows harmful acid
content
No burnout deposits in
open compressor lines
Severe Compressor
Burnout symptoms
Severe contamination
cleanup procedure
Oil is discolored, acidic, and
smells acrid
Burnout deposits found in
the compressor, lines, and
other components
76
MILD SYSTEM CONTAMINATION CLEANUP
Procedure
1. Replace any failed components.
2. If the compressor is good, change the oil.
3. Replace the liquid line drier.
NOTE: If the contamination is from moisture, use heat
lamps during evacuation. Position them at the
compressor, condenser and evaporator prior to
evacuation. Do not position heat lamps too close to
plastic components, or they may melt or warp.
IMPORTANT
Dry nitrogen is recommended for this procedure.
This will prevent CFC release.
3. Follow the normal evacuation procedure, except
replace the evacuation step with the following:
a) Pull vacuum to 1000 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
b) Pull vacuum to 500 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
c) Change the vacuum pump oil.
d) Pull vacuum to 500 microns.
NOTE: You may perform a pressure test as a
preliminary leak check. You should use an electronic
leak detector after system charging to be sure there
are no leaks.
4. Charge the system with the proper refrigerant to
the nameplate charge.
5. Operate the ice machine.
77
SEVERE SYSTEM CONTAMINATION
CLEANUP PROCEDURE
1. Remove the refrigerant charge.
2. Remove the compressor.
3. Wipe away any burnout deposits from suction and
discharge lines at compressor.
4. Sweep through the open system with dry nitrogen.
IMPORTANT
Refrigerant sweeps are not recommended, as they
release CFC’s into the atmosphere.
5. Install a new compressor and new start
components.
6. Install suction line filter-drier in front of
compressor.
7. Install a new liquid line drier.
8. Follow the normal evacuation procedure, except
replace the evacuation step with the following:
IMPORTANT
Dry nitrogen is recommended for this procedure.
This will prevent CFC release.
e) Pull vacuum to 1000 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
f) Change the vacuum pump oil.
g) Pull vacuum to 500 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
h) Change the vacuum pump oil.
i) Pull vacuum to 500 microns. Run the vacuum
pump for 1 hour additional hour.
Continued next page
78
9. Charge the system with the proper refrigerant to
the nameplate charge.
10. Operate the ice machine for one hour. Then,
check the pressure drop across the suction line
filter-drier.
a) If the pressure drop is less than 2 psig, the
filter-drier should be adequate for complete
cleanup.
b) If the pressure drop exceeds 2 psig, change
the suction line filter-drier and the liquid line
drier. Repeat until the pressure drop is
acceptable.
11. Operate the ice machine for 48-72 hours. Replace
the suction line and liquid line drier if necessary.
12. Follow normal evacuation procedures.
79
REPLACING PRESSURE CONTROLS
WITHOUT REMOVING REFRIGERANT
CHARGE
This procedure reduces repair time and cost. Use it
when any of the following components require
replacement, and the refrigeration system is
operational and leak-free.
• Fan cycle control
• High pressure cut-out control
• High side access valve
• Low side access valve
IMPORTANT
This is a required in-warranty repair procedure.
1. Disconnect power to the ice machine.
2. Follow all manufacturers’ instructions supplied with
the pinch-off tool. Position the pinch-off tool
around the tubing as far from the pressure control
as feasible. (See the figure on next page.) Clamp
down on the tubing until the pinch-off is complete.
WARNING
Do not unsolder a defective component. Cut it out of
the system. Do not remove the pinch-off tool until
the new component is securely in place.
3. Cut the tubing of the defective component with a
small tubing cutter.
4. Solder the replacement component in place. Allow
the solder joint to cool.
5. Remove the pinch-off tool.
6. Re-round the tubing. Position the flattened tubing
in the proper hole in the pinch off tool. Tighten the
wing nuts until the block is tight and the tubing is
rounded.
NOTE: The pressure controls will operate normally
once the tubing is re-rounded. Tubing may not reround 100%.
80
FIG. A - “PINCHING OFF” TUBING
FIG. B - RE-ROUNDING TUBING
Using Pinch Off Tool
81
SV1406
BRAZING PROCEDURES FOR DANFOSS
SOLENOID VALVES
• Danfoss stainless steel solenoid valves require a
slightly different brazing technique than brassbodied valves.
Copper clad stainless steel does not require as
much flame contact as copper tubing.
Apply heat to the copper tubing first then the
solenoid socket.
• 15% silver solder is recommended although silver
bearing solder in the 5% to 55% range can be
used.
1. Remove coil and verify direction of flow.
DIRECTION OF
FLOW ARROW
SV3069
2. Fit valve in place and align stem @ 12:00.
90°
90°
SV3070
3. Do not disassemble valve.
82
(
)
MAX. 1300°F
700°C
SV3071
4. Apply heat to copper tubing first and move flame
toward valve socket.
A. Heat copper tubing for approximately 10 to 15
seconds then direct the heat to the solenoid
socket
B. Heat the solenoid socket for 2 to 5 seconds
and apply silver solder to joint.
C. Do not attempt to fill solenoid flange with
solder. Solder will draw into socket.
5. Install new liquid line drier.
6. Leak check joints by pressurizing system with 150psig nitrogen.
7. Evacuate and re-charge system to nameplate
charge.
8. Reinstall coil (using a twisting motion) and attach
wiring.
SV3073
83
FILTER-DRIERS
Liquid Line Filter Drier
The filter-drier used on Manitowoc ice machines are
manufactured to Manitowoc specifications.
The difference between a Manitowoc drier and an offthe-shelf drier is in filtration. A Manitowoc drier has dirtretaining filtration, with fiberglass filters on both the
inlet and outlet ends. This is very important because
ice machines have a back-flushing action that takes
place during every harvest cycle.
A Manitowoc filter-drier has a very high moisture
removal capability and a good acid removal capacity.
IMPORTANT
The liquid line drier is covered as a warranty part.
The liquid line drier must be replaced any time the
system is opened for repair.
84
CONTROL BOARD
FUSE (7A)
TRANSFORMER
THERMISTOR
BIN LIGHT
SWITCH
BIN LIGHT
CONNECTION
BIN
THERMISTAT
CONNECTION
85
DISPLAY
BOARD
CONNECTION
WIRING DIAGRAMS
L1
TRANS
BIN
LIGHT
BIN
LIGHT
SWITCH
(43)
CAUTION: DISCONNECT POWER BEFORE
WORKING ON ELECTRICAL CIRCUITRY
DIAGRAM SHOWN DURING FREEZE CYCLE
COMPRESSOR
(33)
(47)
(44)
THERMO
STAT
(45)
BIN
CONTROL BOARD
FUSE (7A)
(42)
(41)
DRAIN
PUMP
SWITCH
(46)
DISPLAY
BOARD
THERM-
ISTOR
(20)
(48)
CAPACITOR
(32)
C
HOT GAS
SOLENOID
(29)
(28)
WATER INLET
(31)
WATER PUMP
START
S
R
START
RELAY
(24)
DRAIN
PUMP
(25)
(26)
FAN MOTOR
(27)
L2
(23)
(22)
86
(21)
TUBING SCHEMATIC
CAP TUBE
DRIER
HEAT
EXCHANGER
COMPRESSOR
EVAPORATOR
HOT GAS
SOLENOID VALVE
CONDENSER
87
Compact Ice by Manitowoc
Manitowoc WI 54221-1720
Phone: 1-800-235-9698
Website – www.compact-ice.com
©2006 Manitowoc Ice, Inc.
88
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