Manitowoc Ice RNS20A Manuel de service
RNS012 & RNS020
Manitowoc
Nugget Ice Machines
Technician’s
Handbook
This manual is updated as new information and models are
released. Visit our website for the latest manual.
America’s #1 Selling Ice Machine
Part Number STH044 10/13
www.manitowocice.com
Safety Notices
!
Warning
!
Caution
Important
As you work on Manitowoc equipment, be sure to pay
close attention to the safety notices in this handbook.
Disregarding the notices may lead to serious injury
and/or damage to the equipment.
Throughout this handbook, you will see the following
types of safety notices:
Text in a Warning box alerts you to a potential
personal injury situation. Be sure to read the
Warning statement before proceeding, and work
carefully.
Text in a Caution box alerts you to a situation in
which you could damage the equipment. Be sure
to read the Caution statement before proceeding,
and work carefully.
Procedural Notices
As you work on Manitowoc equipment, be sure to read
the procedural notices in this handbook. These notices
supply helpful information which may assist you as
you work.
Throughout this handbook, you will see the following
types of procedural notices:
Text in an Important box provides you with
information that may help you perform a
procedure more efficiently. Disregarding this
information will not cause damage or injury, but it
may slow you down as you work.
NOTE: T ext set off as a Note provides you with simple,
!
Caution
Important
! Warning
but useful, extra information about the procedure you
are performing.
Read These Before Proceeding:
Proper installation, care and maintenance are
essential for maximum performance and troublefree operation of your Manitowoc equipment. Visit
our website www.manitowocfsg.com for manual
updates, translations, or contact information for
service agents in your area. If you encounter
problems not covered by this manual, do not
proceed, contact Manitowoc Foodservice Group.
We will be happy to provide assistance.
Routine adjustments and maintenance
procedures outlined in this handbook are not
covered by the warranty.
PERSONAL INJURY POTENTIAL
Do not operate equipment that has been
misused, abused, neglected, damaged, or
altered/modified from that of original
manufactured specifications.
! Warning
Read this manual thoroughly before operating,
!
Warning
!
Warning
! Warning
! Warning
installing or performing maintenance on the
equipment. Failure to follow instructions in this
manual can cause property damage, injury or
death.
Do not use electrical appliances or accessories
other than those supplied by Manitowoc for your
ice machine model.
Two or more people or a lifting device are
required to lift this appliance.
This equipment contains high voltage electricity
and refrigerant charge. Installation and repairs are
to be performed by properly trained technicians
aware of the dangers of dealing with high vol tage
electricity and refrigerant under pressure. The
technician must also be certified in proper
refrigerant handling and servicing procedures. All
lockout and tag out procedures must be followed
when working on this equipment.
Do not damage the refrigeration circuit when
installing, maintaining or servicing the unit.
! Warning
Do not operate equipment that has been
! Warning
! Warning
! Warning
! Warning
misused, abused, neglected, damaged, or
altered/modified from that of original
manufactured specifications. This appliance is
not intended for use by persons (including
children) with reduced physical, sensory or
mental capabilities, or lack of experience and
knowledge, unless they have been given
supervision concerning use of the appliance b y a
person responsible for their safety. Do not allow
children to play with this appliance.
All covers and access panels must be in place
and properly secured, before operating this
equipment.
Do not obstruct machine vents or openings.
Do not store gasoline or other flammable vapors
or liquids in the vicinity of this or any other
appliance.
Do not clean with water jet.
! Warning
It is the responsibility of the equipment owner to
!
Warning
perform a Personal Protective Equipment Hazard
Assessment to ensure adequate protection
during maintenance procedures.
When using electric appliances, basic
precautions must always be followed, including
the following:
a. Read all the instructions before using
the appliance.
b. To reduce the risk of injury, close
supervision is necessary when an
appliance is used near children.
c. Do not contact moving parts.
d. Only use attachments recommended or
sold by the manufacturer.
e. Do not use outdoors.
f. For a cord-connected appliance, the
following must be included:
• Do not unplug by pulling on cord. To
unplug, grasp the plug, not the cord.
• Unplug from outlet when not in use
and before servicing or cleaning.
• Do not operate any appliance with a
damaged cord or plug, or after the
appliance malfunctions or is dropped
or damaged in any manner. Contact
the nearest authorized service facility
for examination, repair, or electrical
or mechanical adjustment.
g. Follow applicable lock out tag out
procedures before working on
equipment.
h. Connect to a properly grounded outlet
only.
Table of Contents
General Information
Model Numbers . . . . . . . . . . . . . . . . . . . . . 5
Model/Serial Number Location . . . . . . . .5
Manitowoc Cleaner and Sanitizer . . . .5
Ice Machine Warranty Information . . .6
Commercial Warranty . . . . . . . . . . . . . . .6
Residential Warranty . . . . . . . . . . . . . . . .9
Installation
Location of Ice Machine . . . . . . . . . . . . . .13
Ice Machine Clearance Requirements . .14
Ice Machine Heat of Rejection . . . . . . . . .14
Electrical Service . . . . . . . . . . . . . . . . . . .15
Circuit Ampacity . . . . . . . . . . . . . . . . .15
Ice Machine Head Section Water
Supply and Drains . . . . . . . . . . . . . . . . . .16
Potable Water Supply . . . . . . . . . . . . .16
Potable Water Inlet Lines . . . . . . . . . .16
Drain Connections . . . . . . . . . . . . . . . .17
Operation
Ice Making Sequence of Operation . . . . .19
RNS012 - RNS020 Nugget Machines . 19
Touch Pad Sequence of Operation . . . 21
Sequence of Operation Chart . . . . . . .22
Water Level Check . . . . . . . . . . . . . . .23
Part Number STH044 10/13 1
Maintenance
Manitowoc’s Cleaning Technology . . . . 26
Exterior Cleaning . . . . . . . . . . . . . . . . 27
Preventative Maintenance Procedure . . 28
Heavily Scaled Cleaning Procedure . . . . 31
Cleaning And Sanitizing Procedure . . . . 33
Component Disassembly For Cleaning And
Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . . 36
General Information . . . . . . . . . . . . . . 36
Water Dump Valve . . . . . . . . . . . . . . . 50
Cleaning the Condenser . . . . . . . . . . . 52
Removal from Service/Winterization . . . 53
General . . . . . . . . . . . . . . . . . . . . . . . . 53
Troubleshooting
SafeGuard Feature . . . . . . . . . . . . . . . . . . 55
SafeGuards . . . . . . . . . . . . . . . . . . . . . . . 57
No Water . . . . . . . . . . . . . . . . . . . . . . 57
No Ice Production . . . . . . . . . . . . . . . . 58
Ice Machine Will Not Run Diagnostics . . 60
Refrigeration Diagnostics . . . . . . . . . . . . 66
Before Beginning Service . . . . . . . . . . 66
Installation/Visual Inspection Checklist 66
Water System Checklist . . . . . . . . . . . 67
Ice Production/Quality Check . . . . . . . 68
Analyzing Discharge Pressure . . . . . . 69
Analyzing Suction Pressure . . . . . . . . 71
2 Part Number STH044 10/13
Component Check Procedures
Main Fuse . . . . . . . . . . . . . . . . . . . . . .73
ICE/OFF/CLEAN Toggle Switch . . . . .74
Float Switch . . . . . . . . . . . . . . . . . . . . .75
Ice Damper and Hall Effect Switches . 76
Selector Switch . . . . . . . . . . . . . . . . . .79
Dispense Lever Activated . . . . . . . . . .79
Touchless Sensor Activated . . . . . . . .80
Dispense Switch . . . . . . . . . . . . . . . . .82
Touchless Sensor . . . . . . . . . . . . . . . .83
High Pressure Cutout Control . . . . . . . 84
Fan Cycle Control . . . . . . . . . . . . . . . .85
Low Pressure Cutout (LPCO) Control .86
Compressor Electrical Diagnostics . . .87
Diagnosing Start Components . . . . . .89
Refrigerant Recovery/Evacuation . . . . . .91
Normal Self-Contained Procedures . . .91
System Contamination Clean-Up . . . . . . 95
Determining Severity Of Contamination 95
Cleanup Procedure . . . . . . . . . . . . . . .97
Replacing Pressure Controls Without Re-
moving Refrigerant Charge . . . . . . . . .100
Part Number STH044 10/13 3
Component Specifications
Main Fuse . . . . . . . . . . . . . . . . . . . . . . 103
ICE/OFF/CLEAN Toggle Switch . . . . . 103
High Pressure Cutout (HPCO) Control 103
Filter-Driers . . . . . . . . . . . . . . . . . . . . . 103
Total System Refrigerant Charge . . . . . . 104
Charts
Cycle Times/24-Hour Ice Production/
Refrigerant Pressure Charts . . . . . . . . . . 105
RNS012A/RNS020A . . . . . . . . . . . . . . 106
Diagrams
Wiring Diagrams . . . . . . . . . . . . . . . . . . . 107
RNS012/RNS020 115/60/1 & 230/50/1 108
Electronic Control Board . . . . . . . . . . . . 109
RNS012 - RNS020 Control Board . . . 109
Refrigeration Tubing Schematic . . . . . . 111
RNS012 - RNS020 . . . . . . . . . . . . . . . 111
4 Part Number STH044 10/13
General Information
!
Caution
Model Numbers
Self-Contained Air-Cooled
RNS012A - Air-cooled lever dispense model
RNS012AT - Air-cooled touchless dispense model
RNS020A - Air-cooled lever dispense model
RNS020AT - Air-cooled touchless dispense model
Model/Serial Number Location
These numbers are required when requesting
information from your local Manitowoc Distributor,
service representative, or Manitowoc Ice, Inc. The
model and serial number are listed on the OWNER
WARRANTY REGISTRATION CARD. They are also
listed on the MODEL/SERIAL NUMBER DECAL
affixed to the ice machine.
MANITOWOC CLEANER AND SANITIZER
Manitowoc Ice Machine Cleaner and Sanitizer are
available in 16 oz. (473 ml) bottles. These are the only
cleaners and sanitizer approved for use with
Manitowoc products.
Nugget models must use cleaner part number
000000084 ONLY (clear cleaner). Damage to the
evaporator will result with repeated use or high
concentrations of standard (green) cleaner. This
damage is not covered by the warranty.
Cleaner Part Number Sanitizer Part Number
16 oz. 000000084 16 oz. 94-0565-3
1 gal N/A 1 gal. 94-0581-3
Part Number STH044 10/13 5
ICE MACHINE WARRANTY INFORMATION
Important
Owner Warranty Registration Card
Warranty coverage begins the day the ice machine is
installed.
Complete and mail the OWNER WARRANTY
REGISTRATION CARD as soon as possible to
validate the installation date.
If the OWNER WARRANTY REGISTRA TION CARD is
not returned, Manitowoc will use the date of sale to the
Manitowoc Distributor as the first day of warranty
coverage for your new ice machine.
Commercial Warranty
Manitowoc Ice (hereinafter referred to as the
"COMPANY") warrants for a period of twenty four
months from the installation date (except as limited
below) that new Flake/Chiplet ice machines
manufactured by the COMPANY shall be free of
defects in material or workmanship under normal and
proper use and maintenance as specified by the
COMPANY and upon proper installation and start-up
in accordance with the instruction manual supplied
with the ice machine. The COMPANY'S warranty
hereunder with respect to the compressor shall apply
for an additional thirty-six months, excludi n g al l labo r
charges.
The obligation of the COMPANY under this warranty is
limited to the repair or replacement of parts,
components, or assemblies that in the opinion of the
COMPANY are defective. This warranty is further
limited to the cost of parts, components or assemblies
and standard straight time labor charges at the
servicing location.
6 Part Number STH044 10/13
Time and hourly rate schedules, as published from
time to time by the COMPANY, apply to all service
procedures. Additional expenses including without
limitation, travel time, overtime premium, material cost,
accessing or removal of the ice machine, or shipping
are the responsibility of the owner, along with all
maintenance, adjustments, cleaning, and ice
purchases. Labor covered under this warranty must be
performed by a COMPANY Contracted Service
Representative or a refrigeration service agency as
qualified and authorized by the COMPANY'S local
Distributor. The COMPANY'S liability under this
warranty shall in no event be greater than the actual
purchase price paid by customer for the ice machine.
The foregoing warranty shall not apply to (1) any part
or assembly that has been altered, modified, or
changed; (2) any part or assembly that has been
subjected to misuse, abuse, neglect, or accidents; (3)
any ice machine that has been installed and/or
maintained inconsistent with the technical instructions
provided by the COMPANY; or (4) any ice machine
initially installed more than five years from the serial
number production date. This warranty shall not apply
if the Ice Machine's refrigeration system is modified
with a condenser, heat reclaim device, or parts and
assemblies other than those manufactured by the
COMPANY, unless the COMPANY approves these
modifications for specific locations in writing.
THIS WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES OR GUARANTEES OF ANY KIND,
EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITYOR
FITNESS FOR A PARTICULAR PURPOSE. In no
event shall the COMPANY be liable for any special,
indirect, incidental or consequential damages. Upon
the expiration of the warranty period, the COMPANY'S
liability under this warranty shall terminate. The
foregoing warranty shall constitute the sole liability of
the COMPANY and the exclusive remedy of the
customer or user.
Part Number STH044 10/13 7
To secure prompt and continuing warranty service, the
warranty registration card must be completed and sent
to the COMPANY within five (5) days from the
installation date.
Complete the following and retain for your record:
Distributor/Dealer
Model Number Serial Number
Installation Date
MANITOWOC ICE
2110 So. 26th St., P.O. Box 1720, Manitowoc, WI 54220
Telephone: 920-682-0161 • Fax: 920-683-7585
Web Site - www.manitowocice.com
8 Part Number STH044 10/13
Residential Warranty
WHAT DOES THIS LIMITED WARRANTY COVER?
Subject to the exclusions and limitations below,
Manitowoc Ice (“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?
Product Covered Warranty Period
Ice Machine
WHO IS COVERED BY THIS LIMITED WARRANTY?
This limited warranty only applies to the original
consumer of the Product and is not transferable.
Twelve months from the
sale date
Part Number STH044 10/13 9
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
2110 So. 26th St. P.O. Box 1720, Mani towoc, WI
54221-1720
Telephone: 920-682-0161 Fax: 920-683-7585
www.manitowocice.com
10 Part Number STH044 10/13
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
IMITED WARRANTY IS THE SOLE AND EXCLUSIVE
L
W
ARRANTY OF MANITOWOC WITH REGARD TO THE
P
RODUCT. ALL IMPLIED WARRANTIES ARE STRICTLY
IMITED TO THE DURATION OF THE LIMITED WARRANTY
L
A
PPLICABLE TO THE PRODUCTS AS STATED ABOVE,
I
NCLUDING BUT NOT LIMITED TO, ANY WARRANTY OF
ERCHANTABILITY OR OF FITNESS FOR A PARTICULAR
M
P
URPOSE.
Some states do not allow limitations on how long an
implied warranty lasts, so the above limitation may not
apply to you.
Part Number STH044 10/13 11
IN NO EVENT SHALL MANITOWOC OR ANY OF ITS
A
FFILIATES BE LIABLE TO THE CONSUMER OR ANY
THER PERSON FOR ANY INCIDENTAL, CONSEQUENTIAL
O
O
R SPECIAL DAMAGES OF ANY KIND (INCLUDING,
W
ITHOUT LIMITATION, LOSS OF PROFITS, REVENUE OR
USINESS) ARISING FROM OR IN ANY MANNER
B
C
ONNECTED WITH THE PRODUCT, ANY BREACH OF THIS
L
IMITED WARRANTY, OR ANY OTHER CAUSE
HATSOEVER, WHETHER BASED ON CONTRACT, TORT
W
O
R 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
T o 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 registration card and send it to
Manitowoc.
12 Part Number STH044 10/13
Installation
!
Warning
PERSONAL INJURY POTENTIAL
Remove all ice machine panels before lifting and
installing.
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 45°F (7°C),
but must not exceed 110°F (43°C).
• The water temperature must be at least 45°F
(7°C), but must not exceed 90°F (32°C).
• 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. Refer to the chart below
for clearance requirements.
• The ice machine must be protected if it will be
subjected to temperatures below 32°F (0°C).
Failure caused by exposure to freezing
temperatures is not covered by the warranty. See
“Removal from Service/Winterization”
Part Number STH044 10/13 13
Ice Machine Clearance Requirements
RNS012 - RNS020 Self-Contained Air-Cooled
Top 24" (61.0 cm)
Sides 8" (20.3 cm)
Back 5" (12.7 cm)
RNS012 - RNS020 airflow is in the left side and out the top.
Ice Machine Heat of Rejection
Series
Ice Machine
RNS012 - RNS020 2,300
* BTU/Hour
Because the heat of rejection varies during the ice making cycle,
the figure shown is an average.
Heat of Rejection*
Air Conditioning
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 Part Number STH044 10/13
Electrical Service
!
Warning
!
Warning
General
All wiring must conform to local, state and national
codes.
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).
Fuse/Circuit Breaker
A separate fuse/circuit breaker must be provided for
each ice machine. Circuit breakers must be H.A.C.R.
rated (does not apply in Canada).
The ice machine must be grounded in accordance
with national and local electrical codes.
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.)
The wire size (or gauge) is also dependent upon
location, materials used, length of run, etc., so it must
be determined by a qualified electrician.
Self Contained Air-Cooled
Ice
Machine
RNS012
RNS020
Part Number STH044 10/13 15
Voltage
Phase Cycle
115/1/60 15 10.3
230/1/50 15 4.6
Max. Fuse/
Circuit
Breaker
Total
Amps
Ice Machine Head Section Water
Important
Supply and Drains
POTABLE WATER SUPPLY
The ice machine must be connected to a potable water
supply only. Local water conditions may require
treatment of the water to inhibit scale formation, filter
sediment, remove chlorine, and improve taste and
clarity.
If you are installing a Manitowoc water filter system,
refer to the Installation Instructions supplied with the
filter system for ice making water inlet connections.
POTABLE WATER INLET LINES
Follow these guidelines to install water inlet lines:
• Do not connect the ice machine to a hot water
supply. Be sure all hot water restrictors installed for
other equipment are working. (Check valves on
sink faucets, dishwashers, etc.)
• If water pressure exceeds the maximum
recommended pressure of 80 psig (5.5 Bar),
obtain a water pressure regulator from your
Manitowoc Distributor.
• Install a water shut-of f valve and un ion for both th e
ice making and condenser water lines.
• Insulate water inlet lines to prevent condensation.
16 Part Number STH044 10/13
DRAIN CONNECTIONS
Follow these guidelines when installing drain lines to
prevent drain water from flowing back into the ice
machine and storage bin:
• Drain lines must have a 1.5 in. (3.8 cm) drop per 5
ft. of run (2.5 cm per meter), and must not create
traps.
• The floor drain must be large enough to
accommodate drainage from all drains.
• Run separate bin and water-cooled condenser
drain lines. Insulate them to prevent condensation.
• Vent the bin drain to the atmosphere. Do not vent
the condenser drain on water-cooled models.
• Drains must have a union or other suitable means
to allow a place of disconnection from the ice
machine when servicing is required.
Part Number STH044 10/13 17
18 Part Number STH044 10/13
This Page Intentionally Left Blan k
Operation
Ice Making Sequence of Operation
RNS012 - RNS020 NUGGET MACHINES
Ice Making Sequence of Operation
PRIOR TO STARTUP
When the toggle switch is placed in the ICE position
the following must occur in the listed order before ice
making will start.
• The 15 minute delay period must be expired. The
delay period starts upon application of power or a
change in toggle switch position.
• The ice chute damper must be in the closed or
down position.
• The water sensing switch must be closed (water
reservoir full of water and water sensing float in the
up position).
INITIAL STARTUP
A 15 minute delay period must expire. The delay
period starts to time out upon application of power and
can not be overridden. When the five minute delay
period expires, the gear motor energizes. The water in
the reservoir closes the water sensing (float switch)
and the compressor and condenser fan motor
energize.
FREEZE CYCLE
The float valve automatically maintains the water level
in the reservoir. The ice damper will open and close to
verify ice production. The ice machine will continue to
make ice until the ice damper is held open (up) as ice
fills the bin.
Part Number STH044 10/13 19
AUTOMATIC SHUTOFF
When the ice damper is held open by ice, the gear
motor, compressor and condenser fan de-energize.
The five minute delay period starts to time out. The ice
machine will remain off until the 15 minute delay
period expires and the ice damper closes.
RESTART AFTER AUTOMATIC SHUTOFF
The 15 minute delay period must be expired. The
delay period starts when the ice machine enters
Automatic Shutoff and can not be overridden.
1. The ice machine was off for less than 30 minutes.
When the 15 minute delay period expires, the gear
motor, compressor and condenser fan motor energize.
2. The ice machine was off for more than 30
minutes.
The gear motor and dump valve energize to drain the
water from the evaporator and reservoir. After 30
seconds the dump valve de-energizes. When the
reservoir fills with water, the water sensing switch
closes and the compressor and condenser fan motor
energize.
CHANGING TOGGLE SWITCH POSITION IN THE
FREEZE CYCLE
Moving the toggle switch from ICE to OFF will start a
15 minute delay period.
• Moving the toggle switch immediately to the ICE
position - The ice machine waits 15 minutes then
starts.
• Moving the toggle switch to the ICE position after
15 minutes have elapsed - The ice machine
immediately starts.
20 Part Number STH044 10/13
Control Board Features
FLUSH CYCLE
After the ice machine has completed 50 hours of run
time a flush sequence will start. This cycle will drain
and refill the evaporator to remove minerals that have
settled to the bottom of the evaporator. The flush
sequence lasts approximately 21 minutes, after which
the ice machine will reset the 50 hour counter and
automatically start ice making again.
POWER INTERRUPTION DELAY
If power is disconnected the ice machine stops. When
power is reapplied a 15 minute delay is initiated.
MAINTENANCE REQUIRED INDICATOR
The maintenance required light on Nugget Ice
Machines will energize and flash after 10,000 hours of
run time. The ice machine will need to be serviced to
ensure future reliability.
SAFEGUARDS
The ice machine control board has safety features to
protect the ice machine from severe failures. The ice
machine will stop when conditions arise that would
cause major component failure. Refer to Safeguards
for details.
TOUCH PAD SEQUENCE OF OPERATION
Step 1 The control board monitors the touch pad.
Pressing/selecting Ice, Water, or Ice & Water will
energize the corresponding blue Led selection and
waits for dispense lever or touchless sensor activation.
Step 2 Depressing the dispense lever or activating
the touchless sensor closes the relay selected with the
touch pad. Depending on selection, either the water
solenoid, ice dispense motor or both components
activate.
Part Number STH044 10/13 21
22 Part Number STH044 10/13
SEQUENCE OF OPERATION CHART
Nugget Machines
Sequence
Initial Start-Up
The 15 minute delay must expire
first
Freeze Cycle On Off On
Automatic Shut-Off Off Off Off Open Until Damper Closes
Restart
More than 30 minutes have
passed since automatic shutoff
cycle initiated
Restart
Less than 30 minutes have
passed since automatic shutoff
cycle initiated
Contactor
Coil
Off Off On Closed Immediate
Off On On Closed 30 Seconds
Off Off On Closed Immediate
Dump
Valve
Gear
Motor
Ice Damper Duration
Moves to Verify
Ice Production
Until Ice Holds Damper
Open
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