Manitowoc RFF Series User manual

Part Number 000015433_05 3/21
Flake & Nugget Models
RFF/UFF/RNF/UNF Ice Machines
Technician’s Handbook

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.

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.
• 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 000015433_05 3/21 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
RFF/RNF/UFF/UNF Air-cooled Models .........23
RFF/RNF Water-cooled Models ...............23
RFF/RNF QuietQube Model Head Sections......24
RCUF QuietQube Model Condensing Units .....24

10 Part Number 000015433_05 3/21
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
UFF0200/UFF0350/UNF0200/UNF0300 Operation
.........................................35
RFF0320 & RNF0320 Operation...............35
RNF0620/RFF0620/RNF1100/RFF1300/RFF2500
Operation ................................36
RNF1020C/RFF1220C/RNF2000C/RFF2200C ....37
Thermostat Settings ............................. 39