Welbilt MANITOWOC RFK User manual

Part Number STH105 5/20
Flake & Nugget Machines
RFK/UFK/RNK/UNK Models
Technician’s Handbook
Engineered for Ease

Safety Notices
Read these precautions to prevent personal injury:
• 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.
• Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty.
• Proper installation, care and maintenance are essential
for maximum performance and trouble-free operation
of your equipment.
• Visit our website www.manitowocice.com for manual
updates, translations, or contact information for
service agents in your area.
• 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.
• This equipment is intended for indoor use only. Do not
install or operate this equipment in outdoor areas.
• As you work on this 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.

nWarning
Follow these electrical requirements during installation
of this equipment.
• All field wiring must conform to all applicable
codes of the authority having jurisdiction. It is
the responsibility of the end user to provide the
disconnect means to satisfy local codes. Refer to
rating plate for proper voltage.
• This appliance must be grounded.
• This equipment must be positioned so that the plug
is accessible unless other means for disconnection
from the power supply (e.g., circuit breaker or
disconnect switch) is provided.
• Check all wiring connections, including factory
terminals, before operation. Connections can
become loose during shipment and installation.
Cord-connected appliance
• 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

nWarning
Follow these precautions to prevent personal injury
during installation of this equipment:
• Installation must comply with all applicable
equipment fire and health codes with the authority
having jurisdiction.
• To avoid instability the installation area must be
capable of supporting the combined weight of the
equipment and product. Additionally the equipment
must be level side to side and front to back.
• Remove all removable panels before lifting and
installing and use appropriate safety equipment
during installation and servicing. Two or more
people are required to lift or move this appliance to
prevent tipping and/or injury.
• Do not damage the refrigeration circuit when
installing, maintaining or servicing the unit.
• Connect to a potable water supply only.
• This equipment contains refrigerant charge.

nWarning
Follow these precautions to prevent personal injury
while operating or maintaining this equipment.
• Refer to nameplate to identify the type of refrigerant
in your equipment.
• Legs or casters must be installed and the legs/casters
must be screwed in completely. When casters
are installed the mass of this unit will allow it to
move uncontrolled on an inclined surface. These
units must be tethered/secured to comply with all
applicable codes. Swivel casters must be mounted
on the front and rigid casters must be mounted on
the rear. Lock the front casters after installation is
complete.
• Only trained and qualified personnel aware of the
dangers are allowed to work on the equipment.
• 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.
• Crush/Pinch Hazard. Keep hands clear of moving
components. Components can move without
warning unless power is disconnected and all
potential energy is removed.
• Moisture collecting on the floor will create a
slippery surface. Clean up any water on the floor
immediately to prevent a slip hazard.

nWarning
Follow these precautions to prevent personal injury
while operating or maintaining this equipment.
• Objects placed or dropped in the bin can affect
human health and safety. Locate and remove any
objects immediately.
• Never use sharp objects or tools to remove ice or
frost.
• Do not use mechanical devices or other means to
accelerate the defrosting process.
• When using cleaning fluids or chemicals, rubber
gloves and eye protection (and/or face shield) must
be worn.
DANGER
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, clean or
maintain this appliance without proper supervision.

nWarning
Follow these precautions to prevent personal injury
during use and maintenance of this equipment:
• It is the responsibility of the equipment owner to
perform a Personal Protective Equipment Hazard
Assessment to ensure adequate protection during
maintenance procedures.
• Do Not Store Or Use Gasoline Or Other Flammable
Vapors Or Liquids In The Vicinity Of This Or Any
Other Appliance. Never use flammable oil soaked
cloths or combustible cleaning solutions for
cleaning.
• All covers and access panels must be in place and
properly secured when operating this equipment.
• Risk of fire/shock. All minimum clearances must be
maintained. Do not obstruct vents or openings.
• Failure to disconnect power at the main power
supply disconnect could result in serious injury or
death. The power switch DOES NOT disconnect all
incoming power.
• All utility connections and fixtures must be
maintained in accordance with the authority having
jurisdiction.
• Turn off and lockout all utilities (gas, electric, water)
according to approved practices during maintenance
or servicing.

Table of Contents
Part Number STH105 5/20 9
General Information
Model Numbers ................................. 15
Flake Air & Water-Cooled Models .............15
Nugget Air & Water-Cooled Models ...........15
QuietQube Models with Remote Condensing Unit .
.........................................16
Ice Machine Heat of Rejection.................... 16
Ice Machine Warranty Information ............... 17
Warranty Registration & Claim Procedures .....17
Model/Serial Number............................ 17
Manitowoc Cleaner/Descaler and Sanitizer ....... 18
Installation
Installation Requirements........................ 19
Potable Water Requirements..................... 20
Drain Connections ............................... 20
Ice Machine Clearance Requirements............. 21
Cooling Tower Applications ...................... 21
Electrical Service................................. 22
Voltage...................................22
Fuse/Circuit Breaker ........................22
Ground Fault Interrupter Circuit (GFIC) ........22
Maximum Breaker/Minimum Circuit Amperage
Chart ............................................ 23
RFK/RNK/UFK/UNK Air-cooled Models .........23
RFK/RNK Water-cooled Models ...............24
RFF/RNF QuietQube Model Head Sections......24
QuietQube Model Condensing Units ..........24

10 Part Number STH105 5/20
Maintenance
Cleaning and Sanitizing .......................... 25
Exterior Cleaning...........................25
Detailed Descaling and Sanitizing Procedure ....25
Remedial Cleaning Procedure for Heavily Scaled Ice
Machines........................................ 30
Cleaning the Air filter and Condenser..........32
Removal from Service/Winterization ............. 33
Sequence of Operation
Ice Making Sequence of Operation ............... 35
UFK0244/UFK0200/UFK0350/UFK0388/UFK0399 &
UNK0200/UNK0300 Operation ...............35
RFK0320 & RNK0320 Operation ..............35
RNK0620/RFK0620/RNK1100/RFK1300/RFK2500
Operation ................................36
RFF1220C/RNF2000C/RFF2200C ..............37
Thermostat Settings ............................. 39

Part Number STH105 5/20 11
Troubleshooting
UFK0200/UFK0244/UFK0350/UFK0388/UFK0399
UNK0200/UNK0300 Troubleshooting . . . . . . . . . . . . . 41
Self-Contained Air-Cooled ...................41
RFK0320/RNK0320 Troubleshooting .............. 47
Self-Contained Air-Cooled ...................47
RNK0620/RFK0620/RNK1100/RFK1300 RFK2500
Troubleshooting ................................. 53
Self-Contained Air-Cooled ...................53
Rotation Sensor Operation...................53
RFF1220C/RFF2200C Troubleshooting ............ 59
QuietQube Remote Air-cooled Models with
Remote Condensing Unit ....................59
RFK2500 Troubleshooting ........................ 66
Self-Contained Air-Cooled ...................66
Rotation Sensor Operation...................66
RNF1020C Troubleshooting ...................... 73
QuietQube Remote Air-cooled Models with
Remote Condensing Unit ....................73
Refrigeration Troubleshooting.................... 81
Capillary Tube Models ......................81
Thermostatic Expansion Valve Models . . . . . . . . .82
Component Specifications
Bin Thermostat .................................. 83
Evaporator Thermostat .......................... 83
High Pressure Cutout (HPCO) Control ..........84
Rotation Sensor............................85
Low Pressure Cutout (LPCO) Control...........86
Fan Cycle Control ..........................86
Total System Refrigerant Charge ..............87
Filter-Driers ...............................89
Suction Cleanup Filter-Drier..................89
System Contamination Cleanup .................. 90
Determining Severity of Contamination ........90
Mild System Contamination Cleanup Procedure .92
Severe System Contamination Cleanup Procedure .
.........................................93

12 Part Number STH105 5/20
Charts
Ice Production & Refrigerant Pressure ............ 95
Flake Models .................................... 96
UFK0200A ................................96
UFK0244A ................................97
RFK0320A ................................98
UFK0350A ................................99
UFK0388A ...............................100
UFK0399A ...............................101
RFK0620A ...............................102
RFK0620W...............................103
RFF1220C With RJC1275 ...................104
RFK1300A ...............................105
RFK1300W...............................106
RFF2200C With RJC2375 ...................107
RFK2500A ...............................108
Nugget Models .................................109
UNK0200A ...............................109
UNK0300A ...............................110
RNK0320A ...............................111
RNK0620A ...............................112
RNK0620W ..............................113
RNK1100A ...............................114
RNK1100W ..............................115
RNF1020C With RCUF1200 .................116
RNF2000C with RJC2375 ...................117
Rack Models....................................118
RFK1279R ...............................118
RFK2379R ...............................119

Part Number STH105 5/20 13
Diagrams
Wiring Diagrams ................................121
Flake Models ...................................122
UFK0200A/UFK0244A/UFK350A/UFK0388/
UFK0399A Air-Cooled ......................122
RFK0320A/RNK0320 Air-Cooled .............124
RFF1220C QuietQube Head Section ..........126
RFK1300A Air-Cooled ......................128
RFK1300W Water-Cooled...................130
RNF2000C QuietQube Head Section..........132
RFF2200C QuietQube Head Section ..........134
RFK2500A Air-Cooled ......................136
Nugget Models .................................138
UNK0200A/UNK0300AAir-Cooled ............138
RNK0320A Air-Cooled......................140
RNK0620A Air-Cooled......................142
RNK0620W Water-Cooled ..................144
RNF1020C QuietQube Head Section..........146
RNK1100A Air-Cooled......................148
RNK1100W Water-cooled ..................150
Condensing Units ...............................152
RJC and RCUF Condensing Unit 1ph ..........152
RJC and RCUF Condensing Unit 3ph ..........154
Compressor Start Component Wiring ...........156
UFK0200/UNK0200........................156
UNK0300/RFK0320/UFK0350/UNKF0350/RFK0620
........................................156
RFK1300/RFK2500 ........................157

14 Part Number STH105 5/20
Refrigeration Tubing Schematics
UFK0200/UFK0350/UNK0200/UNK0300 ......159
RFK0320/RNK0320 Air-cooled ...............160
RFK0620/RNK0620/RNK1100 Air & Water-cooled..
........................................161
RNF1020C QuietQube Head Section & RCUF1200
Condensing Unit ..........................162
RFF1220C & RCUF1200 Condensing Unit . . . . . .164
RNF2000C QuietQube Head Section & RJC2375
Condensing Unit ..........................166
RFF2200C QuietQube Head Section & RJC2375
Condensing Unit ..........................168
RFK1300 Air & Water-cooled ................170
RFK2500 Air-cooled .......................171

Part Number STH105 5/20 15
Model Numbers
FLAKE AIR & WATER-COOLED MODELS
Flake Models
R452A Refrigerant
Self Storage Air-
Cooled Models
R452A Refrigerant
Modular Air-Cooled
Models
R452A Refrigerant
Modular Water-
Cooled Models
UFK0200A – –
UFK0244A – –
UFK0350A – –
UFK0388A – –
UFK0399A – –
– RFK0320A –
– RFK0620A RFK0620W
– RFK1300A RFK1300W
– RFK2500A –
NUGGET AIR & WATER-COOLED MODELS
R452A Refrigerant
Self Storage Air-
Cooled Models
R452A Refrigerant
Modular Air-Cooled
Models
R452A Refrigerant
Modular Water-
Cooled Models
UNK0200A – –
UNK0300A – –
– RNK0320A –
– RNK0620A RNK0620W
– RNK1100A RNK1100W
General Information

16 Part Number STH105 5/20
QUIETQUBE MODELS WITH REMOTE CONDENSING
UNIT
Flake Models
QuietQube Head Remote Condensing Unit
RFF1220C RJC1275
RFF2200C RJC2375
Nugget Models
QuietQube Head Remote Condensing Unit
RNF1020C RCUF1200
RNF2000C RJC2375
Rack Models
QuietQube Head Refrigeration System
RFK1279R Supplied by Others
RFK2379R Supplied by Others
Ice Machine Heat of Rejection
Series Ice Machine Heat of Rejection BTU/Hour
UFK0200 - UNK0200 2400
UNK0300 - UFK0350 3500
UFK0388 - UFK0399 2181
RFK0320 - RNK0320 3075
RFK0620 - RNK0620 5200
RFK1300 - RNK1100 7500
RFK1279R 7850
RFK2379R 15700
RFK2500R 17000

Part Number STH105 5/20 17
Ice Machine Warranty Information
For warranty information visit: www.manitowocice.com/
Service/Warranty
• Warranty Coverage Information
• Warranty Registration
• Warranty Verification
Warranty coverage begins the day the ice machine is
installed.
WARRANTY REGISTRATION & CLAIM PROCEDURES
Scan the QR code with your smart device or enter the link
in a web browser to access:
• Warranty registration
• Warranty information
• Warranty labor claim form
WWW.MANITOWOCICE.COM/SERVICE/WARRANTY#WARRANTY-
REGISTRATION
Model/Serial Number
These numbers are required when requesting information
from your local Manitowoc Distributor, or Manitowoc Ice.
The model and serial number are listed on the MODEL/
SERIAL NUMBER DECAL affixed to the ice machine.

18 Part Number STH105 5/20
Manitowoc Cleaner/Descaler and Sanitizer
Manitowoc Ice Machine Cleaner/Descaler and Sanitizer
are available in 16 oz. (473 ml) bottles. These are the only
cleaner and sanitizer approved for use with Manitowoc
products.
Cleaner/Descaler Part Number Sanitizer Part Number
473 ml (16 oz.) 000000084 473 ml (16 oz.) 9405653
4 L (1 gal) N/A 4 L (1 gal) 9405813

Part Number STH105 5/20 19
Installation Requirements
The location selected for the ice machine must meet the
following criteria. If any of these criteria are not met,
select another location.
• Air temperature - Minimum 10°C (50°F), Maximum
43°C (110°F)
• The location must be free of airborne and other
contaminants.
• 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.
• The ice machine and bin must be level.
• Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty.
Installation

20 Part Number STH105 5/20
Potable Water Requirements
• Plumbing must conform to local codes.
• Water temperature: Minimum 3°C (37°F), Maximum
32°C (90°F).
• 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 maximum pressure 552 kPa
(80 psig) obtain a water pressure regulator.
• A water shut-off valve is required to clean the ice
machine.
• A union for both the ice making and condenser water
lines is required.
• Water inlet lines require insulation to prevent
condensation.
• When local code requires, a back flow preventer must
be installed on the water inlet line.
Drain Connections
• Drain lines must have a 2.5 cm per meter of run (1.5
inch drop per 5 feet), and must not create traps.
• The floor drain must be large enough to accommodate
drainage from all drains.
• Bin drain termination must have an air gap.
• Separate insulated bin and water-cooled condenser
drain lines are required.
• The bin and ice machine drains must be run separately.