Manitowoc RNS012 User manual

Technician’s
Handbook
This manual is updated as new information and models are
released. Visit our website for the latest manual.
www.manitowocice.com
America’s #1 Selling Ice Machine
RNS012 & RNS020
Nugget Ice Machines
Part Number STH044 10/13
Manitowoc

Safety Notices
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:
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:
!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 equipment. Be sure
to read the Caution statement before proceeding,
and work carefully.
Important
Text in an Important box provides you with
information that may help you perform a
procedure more efficiently. Disregarding this
information will not cause damage or injury, but it
may slow you down as you work.

NOTE: Text set off as a Note provides you with simple,
but useful, extra information about the procedure you
are performing.
Read These Before Proceeding:
!Caution
Proper installation, care and maintenance are
essential for maximum performance and trouble-
free 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.
Important
Routine adjustments and maintenance
procedures outlined in this handbook are not
covered by the warranty.
!Warning
PERSONAL INJURY POTENTIAL
Do not operate equipment that has been
misused, abused, neglected, damaged, or
altered/modified from that of original
manufactured specifications.

!Warning
Read this manual thoroughly before operating,
installing or performing maintenance on the
equipment. Failure to follow instructions in this
manual can cause property damage, injury or
death.
!Warning
Do not use electrical appliances or accessories
other than those supplied by Manitowoc for your
ice machine model.
!Warning
Two or more people or a lifting device are
required to lift this appliance.
!Warning
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 voltage
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.
!Warning
Do not damage the refrigeration circuit when
installing, maintaining or servicing the unit.

!Warning
Do not operate equipment that has been
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 by a
person responsible for their safety. Do not allow
children to play with this appliance.
!Warning
All covers and access panels must be in place
and properly secured, before operating this
equipment.
!Warning
Do not obstruct machine vents or openings.
!Warning
Do not store gasoline or other flammable vapors
or liquids in the vicinity of this or any other
appliance.
!Warning
Do not clean with water jet.

!Warning
It is the responsibility of the equipment owner to
perform a Personal Protective Equipment Hazard
Assessment to ensure adequate protection
during maintenance procedures.
!Warning
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.

Part Number STH044 10/13 1
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

2 Part Number STH044 10/13
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

Part Number STH044 10/13 3
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

4 Part Number STH044 10/13
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

Part Number STH044 10/13 5
General Information
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.
!Caution
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

6 Part Number STH044 10/13
ICE MACHINE WARRANTY INFORMATION
Owner Warranty Registration Card
Warranty coverage begins the day the ice machine is
installed.
If the OWNER WARRANTY REGISTRATION 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, excluding all labor
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.
Important
Complete and mail the OWNER WARRANTY
REGISTRATION CARD as soon as possible to
validate the installation date.

Part Number STH044 10/13 7
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.

8 Part Number STH044 10/13
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: [phone] • Fax: [phone]
Web Site - www.manitowocice.com

Part Number STH044 10/13 9
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?
WHO IS COVERED BY THIS LIMITED WARRANTY?
This limited warranty only applies to the original
consumer of the Product and is not transferable.
Product Covered Warranty Period
Ice Machine Twelve months from the
sale date

10 Part Number STH044 10/13
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, Manitowoc, WI
54221-1720
Telephone: [phone] Fax: [phone]
www.manitowocice.com

Part Number STH044 10/13 11
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 ASSTATED INTHE FOLLOWING SENTENCE, THIS
LIMITED WARRANTY ISTHE SOLE AND EXCLUSIVE
WARRANTY OFMANITOWOC WITH REGARD TOTHE
PRODUCT. ALL IMPLIED WARRANTIES ARE STRICTLY
LIMITED TOTHE DURATION OFTHE LIMITED WARRANTY
APPLICABLE TOTHE PRODUCTS ASSTATED ABOVE,
INCLUDING BUT NOT LIMITED TO, ANY WARRANTY OF
MERCHANTABILITY OROFFITNESS 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.

12 Part Number STH044 10/13
INNOEVENT SHALL MANITOWOC ORANY OFITS
AFFILIATES BELIABLE TOTHE CONSUMER ORANY
OTHER PERSON FOR ANY INCIDENTAL, CONSEQUENTIAL
ORSPECIAL DAMAGES OFANY KIND (INCLUDING,
WITHOUT LIMITATION, LOSS OFPROFITS, REVENUE OR
BUSINESS) ARISING FROM ORINANY MANNER
CONNECTED WITH THE PRODUCT, ANY BREACH OFTHIS
LIMITED WARRANTY, ORANY OTHER CAUSE
WHATSOEVER, WHETHER BASED ONCONTRACT, TORT
ORANY OTHER THEORY OFLIABILITY.
Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above
limitation or exclusion may not apply to you.
HOW STATE LAW APPLIES
This limited warranty gives you specific legal rights,
and you may also have rights that vary from state to
state or from one jurisdiction to another.
REGISTRATION CARD
To secure prompt and continuing warranty service, this
warranty registration card must be completed and sent
to Manitowoc within thirty (30) days from the sale date.
Complete the registration card and send it to
Manitowoc.