Motak PKU0155 User manual

PKU0155/PKM0335/PKM0425/PKM0535 MODELS
Part Number: 000016427 Rev 00 01/2021
Ice Machines
Service Manual
PKU0155/PKM0335/PKM0425/PKM0535 MODELS
For technical Assistance please call - MoTak Service @ 1-800.839.6754

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.
• 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 document. Disregarding the notices may lead to serious injury and/or damage to
the equipment.

Definitions
DANGER
Indicates a hazardous situation that, if not avoided, will result in death or serious injury.
This applies to the most extreme situations.
nWarning
Indicates a hazardous situation that, if not avoided, could result in death or serious
injury.
,Caution
Indicates a hazardous situation that, if not avoided, could result in minor or moderate
injury.
Notice
Indicates information considered important, but not hazard-related (e.g. messages
relating to property damage).
Important
Indicates useful, extra information about the procedure you are performing.
NOTE: Indicates useful, extra information about the procedure you are performing.

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.
• Connect to a potable water supply only.
• 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.
• Ice machines require a deflector when installed on an ice storage bin. Prior to using a
non-OEM ice storage system with this ice machine, contact the bin manufacturer to
assure their ice deflector is compatible.
• Prior to installing a non-OEM ice storage system with this ice machine, follow the
manufacturers installation procedures and verify the location and installation meets the
local/national mechanical codes and stability requirements.

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.
• 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.
• Objects placed or dropped in the bin can affect human health and safety. Locate and
remove any objects immediately.
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.
• Never use a high-pressure water jet for cleaning on the interior or exterior of this unit.
Do not use power cleaning equipment, steel wool, scrapers or wire brushes on stainless
steel or painted surfaces.
• Two or more people are required to move this equipment to prevent tipping.
• Locking the front casters after moving is the owner’s and operator’s responsibility.
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.
• The on-site supervisor is responsible for ensuring that operators are made aware of the
inherent dangers of operating this equipment.
• Do not operate any appliance with a damaged cord or plug. All repairs must be
performed by a qualified service company.

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Part Number: 000016427 Rev 00 08/2020 9
Safety Notices
Requirements - Cleaning - Operation
Model Numbers ......................................................................11
Ice Machine Warranty Information ..........................................11
Warranty .................................................................................11
Warranty Registration..............................................................11
Location of Ice Machine...........................................................12
Ice Machine Clearance Requirements ......................................12
Ice Machine Heat of Rejection .................................................12
Electrical Requirements ...........................................................13
Water Service/Drains............................................................... 14
Water Supply ........................................................................ 14
Water Inlet Lines................................................................... 14
Drain Connections ................................................................ 14
Water Supply and Drain Line Sizing/Connections ................ 15
Descaling and Sanitizing ..........................................................15
General ................................................................................. 15
Detailed Descaling and Sanitizing Procedure........................ 15
Toggle Switch Operation....................................................... 15
Sanitizing Procedure ............................................................. 17
Remove Parts for Cleaning/Descaling................................... 18
Remedial Cleaning Procedure ..................................................22
Cleaning the Condenser Filter.................................................. 23
Cleaning the Condenser...........................................................23
Removal from Service/Winterization.......................................23
Air-cooled Models................................................................. 23
Ice Making Sequence of Operation ..........................................24
PKM0335/PKM0425/PKM0535 ............................................ 24
Control Board Timers PKM0335/PKM0425/PKM0535 ......... 25
Safety Limits PKM0335/PKM0425/PKM0535 ....................... 25
Energized Parts Chart PKM0335/PKM0425/PKM0535 ......... 27
Operational Checks PKM0335/PKM0425/PKM0535.................28
Ice Thickness Check PKM0335/PKM0425/PKM0535............ 28
Minimum/Maximum Slab Weights PKM0335/PKM0425/
PKM0535 .............................................................................. 28
Ice Making Sequence of Operation ..........................................29
PKU0155 ............................................................................... 29
Energized Parts Chart PKU0155 ............................................ 31
Table of Contents

10 Part Number: 000016427 Rev 00 08/2020
Table of Contents (continued)
Operational Checks PKU0155................................................... 32
Siphon System PKU0155 ....................................................... 32
Water Level PKU0155 ........................................................... 32
Water Level Check PKU0155................................................. 33
Ice Thickness Check PKU0155............................................... 33
Minimum/Maximum Slab Weight PKU0155......................... 34
Troubleshooting
PKM0335/PKM0425/PKM0535 Models
Control Board Test Mode .........................................................35
Diagnosing an Ice Machine that Will Not Run ..........................36
Ice Machine Does Not Cycle Into Harvest when the Harvest
Float Is Down/Closed............................................................... 36
Ice Machine Cycles Into Harvest Before the Harvest Float Is
Down/Closed........................................................................... 38
Ice Production Check ............................................................... 39
Installation/Visual Inspection Checklist ................................... 40
Water System Checklist ........................................................... 41
Ice Formation Pattern.............................................................. 42
Safety Limits............................................................................43
Safety Limit 1 ........................................................................ 43
Safety Limit 2 ........................................................................ 43
Safety Limit 3 ........................................................................ 44
Safety Limit Checklist............................................................ 45
Analyzing Discharge Pressure ..................................................48
Discharge Pressure High Checklist ........................................ 49
Freeze Cycle Discharge Pressure Low Checklist .................... 49
Analyzing Suction Pressure .....................................................50
Suction Pressure High Checklist............................................ 52
Suction Pressure Low Checklist............................................. 52
Harvest Valve ..........................................................................53
Harvest Valve Analysis .......................................................... 54
Comparing Evaporator Inlet/Outlet Temperatures ................... 56
Discharge Line Temperature Analysis .......................................57
Refrigeration Component Diagnostics......................................58
Procedure ............................................................................. 58
Final Analysis ........................................................................ 59
Refrigeration Component Diagnostic Chart .............................. 60