mycom 1612LSC series User manual

2202L5JE-DA-C5-N_2015.05.
Compound 2-stage Screw Compressor
1612LSC Speed Increaser Type
Instruction Manual
1612LSC-52 ／1612LSC-62
1612LSC-53 ／1612LSC-63
1612LSC-54
CAUTION
Before operating, servicing, or inspecting this product, read this manual thoroughly to
fully understand the contents.
Keep this Instruction Manual in a safe, designated place for future reference whenever
the manual is needed.
Specifications of this product and contents of this manual are subject to change
without prior notice due to technical improvements, and the like.

2202L5JE-DA-C5-N_2015.05.
Preface
Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
i
Preface
Thank you for purchasing this compound two-stage screw compressor 1612LSC speed
increaser type (hereinafter indicated as “this product”).
This instruction manual (hereinafter indicated as “this manual”) describes safety information,
operational and maintenance procedures in detail for safe and effective use of this product, and applies
to the following types.
1612LSC-*B*-52/62、1612LSC-*B*-53/63、1612LSC-*B*-54
Before installing or using this product, make sure you read this manual.
Keep this manual in a safe place near the product for quick reference.
Revision History
Title Document No. First Edition Issue Date
1612LSC Speed Increaser Type
Instruction manual 2202L5JE-DA-C5-N_2015.05. 2013.05.30
Revision
No. Issue Date Major Contents of Revisions Created / Approved by:
－1974.06.30 Issuance of 1612C first edition Yamamoto
－1983.10.01 New issuance as 1612C/2016C edition Yamamoto
－1993.06.30 Revision of 1612C/2016C (correcting editing
errors, etc.) Yamamoto
－2006.06.30 2004.07 Re-examination by constitution of Product
Liability Act Ikehara / Shozu
00 2013.05.30 Overall re-examination by reissuance as an
electronic edition, its document No. change Ikehara / Hirao
01 2014.01.15 1.1.1「MSDS」change to 「SDS」, etc. Ikehara / Hirao
02 2015.05.12 Modified the constitution of Chapter 4 and
Chapter 5. Correction of describing, etc. Ikehara / Muta

2202L5JE-DA-C5-N_2015.05.
Warranty and Disclaimer
Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
ii
Warranty and Disclaimer
Warranty Clauses
MAYEKAWA shall repair or replace parts of this product for no charge if any failure resulting from
defects in design or manufacture occurs, under normal use with the purpose and method that are in
accordance with the specifications of this product and this manual, within the warranty period.
The warranty period is "12 months from factory shipment of this product". If there is a separate
agreement, that agreement shall prevail in principle.
MAYEKAWA is not liable for production or man-made disaster compensation due to malfunction or
damage of this product.
Disclaimer of Warranty
Although MAYEKAWA warrants the clauses mentioned above, the following clauses are exempted.
Malfunction or damage of this product caused by natural disaster, or other accidental forces
(such as fire, thunderbolt, windstorm, intense rainfall, flood, tidal wave, earthquake, land
subsidence, etc.).
Malfunction or damage caused by misusage described below.
Malfunctions, damage, or deterioration of this product due to abnormal or improper use
(including improperly storing this product outdoors or under too hot/humid conditions,
unexpected inspections, tests, operations, too frequent liquid flow-back operation*, and
too frequent start-stop cycles, etc.).
Malfunction or damage caused by devices or equipments not provided by MAYEKAWA
including operation control methods of those devices.
Malfunction or damage caused by refrigerants, gases, or refrigerant oils, and operating
conditions (design conditions) not approved for this product.
Malfunction or damage caused by maintenance or inspection not recommended by
MAYEKAWA.
Malfunction or damage caused by parts that are not genuine.
Malfunction or damage caused by remodeling the product without approval of
MAYEKAWA.
Malfunction or damage caused by unexpected misusage
"Liquid flow-back operation" is ･･･
Normally, while the compressor sucks in the refrigerant liquid only after vaporizing it in the
evaporator, it may directly sucks it in because of the faulty adjustment or failure of the
expansion valve. We call this state of compressor operation "liquid flow-back operation".
No compressor can compress a liquid. The compressor may be damaged should the liquid be
sucked in.

2202L5JE-DA-C5-N_2015.05.
Important Information
Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
iii
Important Information
Intended Use of this Product
This product is a general-purpose screw compressor intended for refrigeration and cold storage.
Do not use the product for any purposes for which it was not intended or which depart from the
specifications. For specifications of this product, refer to “2.3 Compressor Specifications”.
The maintenance items described in this manual should be performed safely and closely following
procedures.
Important Information for Safe Use of this Product
Although MAYEKAWA has thoroughly considered the safety measures for this product, all hazards,
including potential hazards caused by human error or environmental conditions, cannot be anticipated.
There are many guidelines that must be observed for operating this product. However, the warnings in
this manual and the safety labels on the product are not all inclusive. When operating this product,
always pay extreme attention to general safety precautions as well as on items described in this
manual.
Important rules for safe operation that apply to all workers including managers and supervisors are
listed below.
Before using this product, carefully read and fully understand the contents written in this manual and
pay attention to safety.
Operation, maintenance, and inspection of this product should be performed by qualified
personnel educated about the fundamentals of the product and trained about the hazards
involved and measures to avoid danger.
Do not allow anyone other than those educated about the fundamental expertise of the
product and trained about hazards involved and measures to avoid dangers to approach the
product while it is operating or during maintenance.
Observe all related federal/national and local codes and regulations.
To prevent accidents, do not carry out any operation or maintenance other than those
described in this manual, or use the product for any unapproved purpose.
Replace parts with genuine parts.
Not only workers but also managers should actively participate in safety and health activities in
the workplace to prevent accidents.
When closing or opening valves during work, apply lockout/tagout without failure, to prevent
the valves from closing or opening accidentally during the work.
[Lockout] To lock with a key in order to keep people, except the workers involved, from
operating the product.
“Lockout” means disconnecting or keeping disconnected machines and devices by locking their energy
(power) sources. Lockout is not just simply turning off the power switches to stop the supply of power,
but includes immobilizing them with a key or similar device to keep any blocked switches from being
operated.
Lockout devices are devices such as keys, covers, and latches, to immobilize switches, valves,
opening and closing levers, etc., with a state of being locked.
[Tagout] To prevent any inappropriate work by hanging tag plates indicating “work in progress”.
“Tagout” means to clearly indicate, by hanging tag plates, that a device is in lockout and that operation
of the device is prohibited. Tag plates forbidding operation, starting, opening, etc. are warnings clearly
stating to not operate energy (power) sources, and are not for stopping blocking devices.

2202L5JE-DA-C5-N_2015.05.
Important Information
Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
iv
Observe the following precautions when performing maintenance work on electrical control.
Electrical maintenance of the product must be performed by certified/qualified personnel and
only by those educated about the electrical control of the product.
Before servicing or inspecting the electrical equipment or devices, turn off the motor main
power and control power, and perform lockout/tagout to prevent the power from being turned
on during work.
Even when the motor main power and control power are turned off, the product may be turned on if
power is supplied from outside the package unit in which this product is used. Make sure the power
supply on the power source side is shut off, and perform lockout/tagout to prevent this product from
being turned on during work.
About This Manual
This product may be modified without prior notice. Therefore, the appearance of actual
machine may differ from the descriptions in this manual. If you have any questions, contact
our sales offices or service centers. For each sight of MAYEKAWA, refer to "Contact
Information" in this manual or following URL. http://www.mayekawa.com/about/network/
This manual is in English. If any other language is required it is the customer’s responsibility to
prepare a manual for safety education and operation instructions.
This manual is copyrighted. Drawings and technical references including this manual shall not,
in whole or in part, be copied, photocopied, or reproduced into any electronic medium or
machine-readable form without prior permission from MAYEKAWA.
Photographs or drawings included in this manual may differ from the appearance of the actual
product.
If this manual is lost or damaged, immediately place a purchase order to our local sales offices
or service centers for a new manual. Using the product without the manual may result in safety
issues.
If you resell the product, never fail to include this manual with the product.
Construction of This Manual
Title of section and chapter Description details
Preface Describes the outline of this manual and how to use it.
Warranties and Disclaimer Describes what MAYEKAW
A
warrants and what are covered by the
warranties. Warranty exemption is stated as disclaimer.
Important Information Describes important information related to this product and this
manual.
1. Safety Describes workers' safety information, safety measures taken for this product, and administrative control on industrial safety which is
required when handling this product.
2..Compressor Specifications
and Structure Describes main components of this product and their functions, specifications and operating limits.
3. Installation Describes procedures for installing this product.
4. Compressor and Package
Unit Operation Describes precautions for using this product.
5. Maintenance and Inspection Describes inspection locations & frequency and assembly &
disassembly of this product.
6. Troubleshooting Regarding major troubles that may occur during use of this product, describes how this product will act as well as what actions should
be taken when a trouble may occur.
7. Related Documents Shows materials such as exploded drawings and parts list.
Contact Information Provides contact information for our sales offices and service centers which is to be used for purposes such as
genuine parts ordering.

2202L5JE-DA-C5-N_2015.05.
Table of Contents
Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
v
Table of Contents
Preface .................................................................................................................... ⅰ
Revision History..................................................................................................... ⅰ
Warranty and Disclaimer....................................................................................... ⅱ
Important Information............................................................................................ ⅲ
Intended Use of This Product ...........................................................................................ⅲ
Important Information for Safe Use of This Product ..........................................................ⅲ
About This Manual.............................................................................................................ⅳ
Construction of This Manual..............................................................................................ⅳ
Table of Contents................................................................................................... ⅴ
1 Safety
1.1 Strict Requirements and Prohibitions........................................................1-1
1.1.1 Strict Requirements (Do's)................................................................................... 1-1
1.1.1.1 Do's on Operation........................................................................................1-1
1.1.1.2 Do's on Maintenance...................................................................................1-1
1.1.1.3 Do's on Lockout/Tagout after Shutting Off the Power .................................1-1
1.1.1.4 Do's about Personal Protective Gear..........................................................1-2
1.1.1.5 Do's about the Handling of Hazardous and Toxic Substances....................1-2
1.1.1.6 Do's about Handling Emergency Situations................................................1-2
1.1.1.7 Do's about Waste Oil, Fluid, and Materials .................................................1-2
1.1.1.8 Other Do's....................................................................................................1-2
1.1.2 Prohibitions (Don'ts) ............................................................................................ 1-3
1.2 Warnings.......................................................................................................1-3
1.3 Residual Risks .............................................................................................1-4
1.4 Safety Devices..............................................................................................1-6
1.4.1 Emergency Stop Button.......................................................................................1-6
1.4.2 Breakers for the Main Motor Power and Control Power......................................1-6
1.4.3 Compressor Protection Devices..........................................................................1-7
2 Compressor Specifications and Structure
2.1 Overview of the Compound 2-stage Screw Compressor
1612LSC Speed increaser Type..................................................................2-1
2.2 Model Designation of the Compressor.......................................................2-1
2.3 Compressor Specifications.........................................................................2-2
2.3.1 Standard Specifications.......................................................................................2-2
2.3.2 Operation Limits...................................................................................................2-3
2.3.3 Outer Dimensions................................................................................................ 2-4
2.4 Structure of Compressor ............................................................................2-5

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Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
vi
2.5 Mechanisms .................................................................................................2-6
2.5.1 Basics of the Screw Compressor ........................................................................2-6
2.5.2 Suction Process................................................................................................... 2-6
2.5.3 Compression Process..........................................................................................2-7
2.5.4 Discharge Process............................................................................................... 2-7
2.5.5 About Volume Ratio (Vi)...................................................................................... 2-7
2.5.6 Capacity Control Mechanism............................................................................... 2-9
2.5.7 Bearings and Balance Piston .............................................................................. 2-9
2.5.8 Shaft Seal ............................................................................................................ 2-9
2.6 Gas and Oil Flow........................................................................................2-10
3 Installation
3.1 General Precautions for Installation .........................................................3-1
3.2 Installation Works........................................................................................3-1
3.2.1 Unpacking............................................................................................................3-1
3.2.2 Storage ................................................................................................................3-1
3.2.3 Transportation...................................................................................................... 3-1
3.2.4 Preparation for Installation...................................................................................3-4
3.2.5 Installation ..................................................................................................3-5
3.2.5.1 Installation....................................................................................................3-5
3.2.5.2 Shaft Alignment between Compressor and Driving Machine...................... 3-5
3.2.5.3 Piping Connection ....................................................................................... 3-6
3.2.5.4 Equipment and Devices for Protection of the Compressor.........................3-6
3.2.6 Airtightness Test..................................................................................................3-7
3.2.7 Lubricating Oil Charge.........................................................................................3-7
3.2.7.1 Initial Charge of Lubricating Oil ................................................................... 3-7
3.2.7.2 Additional Charge of Lubricating Oil............................................................ 3-7
3.2.8 Charge of Refrigerant.......................................................................................... 3-7
3.2.9 Check after Installation........................................................................................3-7
4 Compressor and Package Unit Operation
4.1 Lubricating Oil (Refrigerant Oil) .................................................................4-1
4.1.1 Precautions for Selecting the Lubricating Oil....................................................... 4-1
4.1.2 Recommended Lubricating Oils ..........................................................................4-1
4.1.2.1 Recommended Lubricating Oils for Ammonia Refrigerant..........................4-1
4.1.2.2 Oils for Systems using Hydrofluorocarbon (HFC) Refrigerants .................. 4-2
4.1.3 Change of Lubricating Oil Brand ......................................................................... 4-3
4.1.4 Precautions for Handling Lubricating Oil.............................................................4-4
4.1.4.1 Precautions for Handling Polyalkylene Glycol (PAG).................................. 4-4
4.1.4.2 Precautions for Handling Polyolester (POE) Oil..........................................4-4
4.1.5 Lubricating Oil Management Criteria...................................................................4-5
4.1.6 Lubricating Oil Replacement Timing....................................................................4-6
4.1.6.1 After Starting the Initial Operation .............................................................. 4-6
4.1.6.2 During Normal Operation ...........................................................................4-6

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4.2 Precautions for Operation...........................................................................4-7
4.2.1 Prevention of Liquid Flow-back ........................................................................... 4-7
4.2.2 Purging of Non-condensable Gases....................................................................4-7
4.3 When Stopping the Compressor for a Long Time....................................4-8
5 Maintenance and Inspection
5.1 Precautions for Maintenance and Inspection............................................5-1
5.2 Maintenance and Inspection List................................................................5-3
5.2.1 Daily Management...............................................................................................5-3
5.2.2 Periodic Inspection ..............................................................................................5-5
5.2.3 Guidelines for the Timing of Compressor Overhaul............................................5-6
5.3 Compressor Disassembly Preparation......................................................5-7
5.3.1 Disassembly Tools and Work Place....................................................................5-7
5.3.2 Replacement Parts..............................................................................................5-7
5.3.2 Refrigerant Gas Recovery ...............................................................................5-10
5.3.4 Removing Parts Connected to the Unit............................................................. 5-11
5.3.5 Compressor Removing and Lifting....................................................................5-12
5.3.6 Removing Oil from Inside the Compressor........................................................5-12
5.4 Disassembly and Inspection.....................................................................5-13
5.4.1 Shaft Seal Block ................................................................................................5-15
5.4.1.1 Disassembly..............................................................................................5-15
5.4.1.2 Inspection ..................................................................................................5-16
5.4.2 Unloader Indicator .............................................................................................5-17
5.4.2.1 Disassembly..............................................................................................5-18
5.4.2.2 Inspection ..................................................................................................5-19
5.4.3 Unloader Cover..................................................................................................5-20
5.4.3.1 Disassembly..............................................................................................5-20
5.4.3.2 Inspection ..................................................................................................5-20
5.4.4 Unloader Piston and Unloader Cylinder............................................................5-21
5.4.4.1 Disassembly..............................................................................................5-21
5.4.4.2 Inspection ..................................................................................................5-21
5.4.5 Speed increaser Gear Casing Cover................................................................. 5-22
5.4.5.1 Disassembly..............................................................................................5-22
5.4.6 Speed increaser Gear Casing Block .................................................................5-23
5.4.6.1 Disassembly..............................................................................................5-23
5.4.6.2 Inspection ..................................................................................................5-26
5.4.7 Separating High-stage and Low-stage.............................................................. 5-27
5.4.7.1 Disassembly..............................................................................................5-27
5.4.8 Gear Coupling....................................................................................................5-28
5.4.8.1 Disassembly..............................................................................................5-28
5.4.8.2 Inspection ..................................................................................................5-28
5.4.9 Balance Piston Cover........................................................................................ 5-29
5.4.10 Balance Piston...................................................................................................5-29

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viii
5.4.10.1 Disassembly..............................................................................................5-29
5.4.10.2 Inspection ..................................................................................................5-30
5.4.11 High-stage Suction Cover and Side Bearings...................................................5-31
5.4.11.1 Disassembly ..............................................................................................5-31
5.4.11.2 Inspection .................................................................................................. 5-31
5.4.12 Low-stage Suction Cover and Side Bearings....................................................5-32
5.4.12.1 Disassembly..............................................................................................5-32
5.4.12.2 Inspection ..................................................................................................5-33
5.4.13 Thrust Bearings Block........................................................................................ 5-34
5.4.13.1 Disassembly of High-stage Thrust Bearing block......................................5-34
5.4.13.2 Disassembly of Low-stage Thrust Bearing block ......................................5-35
5.4.13.3 Inspection (High-stage/Low-stage)............................................................5-36
5.4.14 High-stage Rotors and Main Rotor Casing........................................................5-37
5.4.14.1 Disassembly..............................................................................................5-37
5.4.14.2 Inspection ..................................................................................................5-37
5.4.15 Low-stage Rotors and Main Rotor Casing.........................................................5-38
5.4.16 High-stage Bearing Head and Main Bearings................................................... 5-39
5.4.16.1 Disassembly..............................................................................................5-39
5.4.16.2 Inspection ..................................................................................................5-39
5.4.17 Low-stage Bearing Head and Main Bearings....................................................5-40
5.4.17.1 Disassembly..............................................................................................5-40
5.4.17.2 Inspection ..................................................................................................5-40
5.4.18 Low-stage Unloader Slide Valve and Guide Block............................................5-41
5.4.18.1 Disassembly..............................................................................................5-41
5.4.18.2 Inspection ..................................................................................................5-41
5.5 Reassembly................................................................................................5-42
5.5.1 Low-stage Unloader Slide Valve and Guide Block............................................5-44
5.5.2 Bearing Head and Rotor Casing........................................................................5-45
5.5.3 Bearing Head and Main Bearings......................................................................5-46
5.5.4 Rotor Assembly .................................................................................................5-47
5.5.5 Suction Cover and Side Bearings......................................................................5-48
5.5.6 Thrust Bearing Block (....................................................................................... 5-50
5.5.6.1 End Clearance Measurement....................................................................5-52
5.5.6.2 End Clearance Adjustment Method........................................................... 5-54
5.5.6.3 Tightening after End Clearance Adjustment ............................................. 5-54
5.5.7 Combining High-stage and Low-stage Blocks................................................... 5-55
5.5.8 Balance Piston Cover........................................................................................ 5-57
5.5.9 Speed Increaser Gear Block..............................................................................5-58
5.5.10 Installation of Speed Increaser Gear Casing to Low-stage Bearing Head........ 5-61
5.5.11 Unloader Cylinder and Unloader Piston............................................................5-63
5.5.12 Unloader Cover..................................................................................................5-65
5.5.13 Shaft Seal Block ................................................................................................5-66
5.5.14 Unloader Indicator .............................................................................................5-69
5.5.14.1 Potentiometer............................................................................................5-70
5.5.14.2 Micro-switch............................................................................................... 5-70
5.5.14.3 Assembly and Adjustment......................................................................... 5-71

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Compound 2-stage Screw Compressor 1612LSC Speed Increaser Type
ix
6 Troubleshooting
01: Compressor does not start up................................................................................6-1
02: Compressor stops immediately after startup.......................................................... 6-1
03: Unusually low pressure (decrease of suction pressure)........................................6-2
04: Low oil pressure (low lubricating oil supply pressure)............................................ 6-2
05: Intermediate pressure is unusually high.................................................................6-3
06: Unusually high pressure (abnormal discharge pressure) ...................................... 6-4
07: Discharge temperature is abnormally high.............................................................6-5
08: Leak from mechanical seal.....................................................................................6-6
09: Squeaking of mechanical seal................................................................................6-7
10: Capacity control position is indicated incorrectly....................................................6-7
11: Capacity control malfunction..................................................................................6-8
12: Compressor generates abnormal vibration and/or sound...................................... 6-9
7 Related Documents
7.1 Development Views, Assembly Sectional Views......................................7-1
■Figure 7-1 Development View (Low-stage)...........................................................7-1
■Figure 7-2 Development View of the Parts Assembly (High-stage) ......................7-2
■Figure 7-3 Assembly Sectional View (Vertical)......................................................7-3
■Figure 7-4 Assembly Sectional View (Horizontal) .................................................7-4
7.2 Parts Configuration Table...........................................................................7-5
7.3 Tightening Torques for Bolts and Nuts .....................................................7-9
7.4 O-rings for Use...........................................................................................7-11
7.4.1 List of O-rings for Use........................................................................................7-11
7.4.2 List of O-ring Materials for Screw Compressor..................................................7-11
7.5 Tools for Disassembly...............................................................................7-12
Contact Information
Sales Offices in Japan ...........................................................................................Contact-1
Manufacturing Bases in Japan...............................................................................Contact-1
Global Network.......................................................................................................Contact-2
NORTH AMERICA........................................................................................................Contact-2
EUROPE and AFRICA..................................................................................................Contact-2
ASIA PACIFIC...............................................................................................................Contact-3
LATIN AMERICA...........................................................................................................Contact-5

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.1 Strict Requirements and Prohibitions
1612LSC Speed Increaser Type 1-1
1. Safety
1.1 Strict Requirements and Prohibitions
1.1.1 Strict Requirements (Do’s)
1.1.1.1 Do’s on Operation
Make sure to install safety and protective devices on the package unit.
Regularly inspect the safety and protective devices if they function properly.
If the safety or protective devices do not work properly or if this product operates abnormally,
immediately stop the operation and report to the supervisor. Obtain his/her approval and
direction before restarting this product.
If this product stops for unknown reasons, immediately inform your supervisor of it. Obtain
his/her approval before restarting the compressor.
Some types of refrigerants emit bad smell or toxic gases when they leak. Make sure to
ventilate the air during operation.
For the properties of refrigerant and lubricating oil (corrosiveness, decomposability or toxicity),
be sure to obtain the Safety Data Sheet (SDS) and follow the relevant information.
When stopping the operation of this product, close the suction and discharge side shut-off
valves and turn "OFF" the motor (main power), heater power, and control power.
1.1.1.2 Do’s on Maintenance
Prepare work procedures based on a work schedule. Be sure to perform danger forecasting
before starting the work.
Before performing the work together with at least one other person, thoroughly confirm each
other's work details and procedures to acknowledge the other worker's movement.
When troubleshooting during operation or before performing setup, cleaning, maintenance, or
inspection of this product, always turn OFF the main power to the motor and control power and
other devices. Also, lock and tag out them to prevent the power from being supplied
erroneously during operation.
When troubleshooting during operation or before performing setup, cleaning, maintenance, or
inspection of this product, confirm that the pressure inside this product and the package unit is
at atmospheric pressure.
Some refrigerants in use generate bad smell or toxic gases, or may cause deficiency of
oxygen. Before starting work, measure oxygen concentration in the work area as necessary.
Ventilate the area well. Be sure to keep the area well ventilated until the work is finished.
For the properties of refrigerant and lubricating oil (corrosiveness, decomposability or toxicity),
be sure to obtain the Safety Data Sheet (SDS) and follow the relevant information.
After using tools always restore to designated place and never leave tools in the package unit.
1.1.1.3 Do’s on Lockout/Tagout after Shutting Off the Power
Attach lockout/tagout mechanism to the main breakers of motor main power and control power.
Lockout/tagout after power off is a very effective means to secure safety. It can prevent the
power source from being turned on by accident by two or more workers which may cause
injury to other worker(s).

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.1 Strict Requirements and Prohibitions
1612LSC Speed Increaser Type 1-2
If there are any possibilities of danger during works (especially during cleaning, maintenance
and inspection, and troubleshooting), turn "OFF" the motor main power and control power, and
perform lockout/tagout.
In the following situations, workers may neglect to perform power source shutoff or
lockout/tagout. Clearly notify the workers of the necessity of lockout/tagout.
It is assumed that workers do not perform lockout/tagout before starting work because it is
troublesome, and only turn "OFF" the main motor and control power.
It is assumed that workers only turn off the main motor and control power and do not
lockout/tagout the main motor and control power, because they judge that there is no
danger.
1.1.1.4 Do’s about Personal Protective Gear
Prepare and use protective gear complying with the safety standards of the regulations.
Check the function of each protective gear before using.
Wear designated clothes such as work outfits, with their cuffs tightly closed.
Do not wear any neckties or jewelry as there is a risk of being entangled by a movable part or
rotating part. Put on a helmet as your hair may get entangled.
Do not have anything in your pocket to prevent objects from falling into the package unit.
1.1.1.5 Do’s about Handling of Hazardous and Toxic Substances
Obtain the Safety Data Sheet (SDS) from manufacturers of hazardous and toxic substances.
Check the SDS and follow the handling instructions recommended by the manufacturers to
handle and store those substances.
1.1.1.6 Do’s about Handling Emergency Situations
Formulate an emergency action plan complying with the regulations, and post it on a safe
place.
1.1.1.7 Do’s about Waste Oil, Fluid, and Materials
Disposing of refrigerant and oil used for this product are subject to a number of regulations for
the environmental protection purposes. Follow the local, state, federal acts and regulations
and your company's rules when disposing of such waste oil, fluid and materials.
1.1.1.8 Other Do’s
Clean the floor around the entire refrigerating/cold storage/gas compression package unit.
Provide a safety passage.
Walk only on the areas set up as a work floor. Also, do not leave tools and cleaning solutions
in that area.
If water or oil is spilled on this product or the floor, immediately wipe it off to prevent workers
from slipping and getting injured.

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.2 Warnings
1612LSC Speed Increaser Type 1-3
1.1.2 Prohibitions (Don’ts)
Do not remove or relocate any safety device, including electrical interfaces.
Do not disable any safety device by short-circuiting or bypassing without any permission.
Do not leave this product unsafe and unattended, by removing a safety cover or some other
measures.
Do not touch, clean or lubricate any part of this product which is moving.
Do not touch relays or electric systems such as terminal block with bare hands when turning
on the power.
1.2 Warnings
The warning messages described in this manual warn dangerous situations that may arise during work
by using the following four categories.
Neglecting such warnings may cause accidents, resulting in personal injury or even death.
Also, this product or its auxiliary equipment may be heavily damaged. Therefore, be sure to always
observe the instructions of the warnings.
Table 1-1 Warning Symbols and their Meanings
Symbol Meaning
Indicates a hazardous situation which, if not avoided, could very likely cause serious
injury or death.
Indicates a potentially hazardous situation which, if not avoided, may cause serious
injury or death.
Indicates a potentially hazardous situation which, if not avoided, may cause minor or
moderate injury.
Indicates a potentially hazardous situation which, if not avoided, may result in property
damage.

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.3 Residual Risks
1612LSC Speed Increaser Type 1-4
1.3 Residual Risks
The following information assumes that this product is operated or inspected/maintained while being
used in general refrigerating/cold storage/gas compression package units.
Note that all hazardous sources cannot be predicted for the applications mentioned.
Devise appropriate countermeasures for hazardous sources in your systems.
Table 1-2 Hazardous Sources
Hazardous sources Predicted hazard Countermeasures in
operation
Countermeasures in
cleaning, inspection,
and parts exchange
A Motor and
compressor coupling
Refer to Figure 1-1
Caught in due to contact Install coupling cover
and prohibit opening.
Keep away.
Turn off motor main
power and control power,
and conduct
lockout/tagout.
B Motor terminals Electric shock caused by
contact with live wires or
electrical leakage
Keep away.
Do not open terminal
boxes.
Do not touch terminal
boxes.
Turn off motor main
power and control power,
and conduct
lockout/tagout.
C Compressor
low-stage side
suction casing
Refer to Figure 1-1
Frostbite due to contact
Contact with or inhalation
of hazardous substances
generated by leakage of
refrigerant or the like
Keep away and do not
touch.
Wear protective gear.
Detect gas leakage.
Wear protective gear.
Work under room
temperature.
D Compresso
r
intermediate piping
(low-stage discharge
port to high stage
suction port)
Refer to Figure 1-1
Burn injury due to contact
Contact with or inhalation
of hazardous substances
generated by leakage or
spout of refrigerant or the
like
Keep away and do not
touch
Wear protective gear
Gas leakage detection
Wear protective gear
Work in temperatures
below 40 °C
E Compressor
high-stage side
discharge casing and
discharge piping
Refer to Figure 1-1
Burn injury due to contact
Contact with or inhalation
of hazardous substances
generated by leakage or
spout of refrigerant or the
like
Keep away and do not
touch.
Wear protective gear.
Detect gas leakage.
Wear protective gear.
Work at a temperature of
not higher than 40°C.
F Check valves/service
valves and joints on
each section of the
package unit
Contact with or inhalation
of hazardous substances
generated by mishandling
or leakage
Frostbite or burn due to
contact
Sufficient ventilation
Indicate valve
open/close state.
Keep away and do not
touch.
Wear protective gear.
Sufficient ventilation
Wear protective gear.
Tagout for controlled
valve
G Solenoid
valves/motor
operated valves on
each section of the
package unit
Electric shock caused by
contact with live wires or
electrical leakage
Pinched due to contact
with driving part
Install protective cover
on terminals, and
prohibit opening.
Keep away and do not
touch.
Wear protective gear.
Turn off each breaker and
the control power, and
conduct lockout/tagout.
Wear protective gear.
H Electric components
in each section of the
package unit (oil
heater, protective
switch, etc.)
Electric shock caused by
contact with live wires or
electrical leakage
Pinched due to contact
with driving part
Install protective cover
on terminals, and
prohibit opening.
Keep away and do not
touch.
Wear protective gear.
Turn off each breaker and
the control power, and
conduct lockout/tagout.
Wear protective gear.
I Package unit oil
drains Contact with hazardous
substances generated by
leakage or spout
Burn caused by contact
with high-temperature
fluid
Sufficient ventilation
Keep away and do not
touch.
Wear protective gear.
Sufficient ventilation
Wear protective gear.
Work at a temperature of
not higher than 40°C.
J Noises Damage caused by noise Wear protective gear. —

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.3 Residual Risks
1612LSC Speed Increaser Type 1-5
Figure 1-1 Locations of Hazardous Sources (compressor)

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.4 Safety Devices
1612LSC Speed Increaser Type 1-6
1.4 Safety Devices
For safe use and protection of this product, make sure to attach safety devices to this product in
accordance with the regulations and the following instructions.
Safety devices cannot be kept in normal condition unless inspected and maintained at regular intervals.
Their maintenance and inspection need to be performed as an important part of the
maintenance/inspection work project. Provide users of this product with necessary information on the
safety devices, for example, types of the safety devices, installation position, function, and inspection
method of safety related devices.
Check the safety devices after turning on the power and before operation of this
product. If they do not operate normally, immediately take repair or replace
safeties before starting this product.
1.4.1 Emergency Stop Button
Overview/Function/Purpose
The emergency stop buttons are used to stop the compressor operation immediately if an
emergency occurs in this product.
Installation Positions
On the control board and in the operation control room
Stop/Restoration Methods
The operating procedures for the emergency stop button, i.e., how to stop the operation and
restore the normal operating condition, must be clearly defined and the information provided to the
user of this product.
Inspection Method/Cycle
The emergency stop buttons must be tested before commissioning and must also be periodically
re-tested after that. The inspection procedures and the inspection interval for the emergency stop
button must be clearly defined and the information provided to the user of this product.
1.4.2 Breakers of Motor Main Power and Control Power
(with Lockout/Tagout Mechanism)
Overview/Function/Purpose
Turn off the main motor and control power, and if there is any possibility of danger during work
(especially during cleaning, maintenance, inspection, or troubleshooting), lockout/tagout devices
must be used on the breakers of the main motor and control powers to prevent injuries to workers in
case the power is turned on accidentally during work.
Methods of Performing and Releasing Lockout/Tagout
Make sure to clearly notify methods of performing and releasing lockout/tagout referring to the
regulations created by Occupational Safety & Health Administration (OSHA) or local governing
body.
Inspection Method/Cycle
The inspection procedures and the inspection interval for the lockout/tagout devices must be clearly
defined and the information provided to the user of this product.

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.4 Safety Devices
1612LSC Speed Increaser Type 1-7
1.4.3 Compressor Protective Devices
Be sure to adjust the set values and check operation of the protective devices at
the commissioning.
Overview/Function/Purpose
These protective devices are used to protect this product.
Protecting from discharge temperature rise (DT)
This device stops the compressor operation when the discharge temperature of the
compressor exceeds the set value.
Install a temperature sensing port to the discharge pipe.
Protecting from oil temperature rise (OT)
This device stops the compressor operation when the oil temperature of the compressor
exceeds the set value.
Install a temperature sensing port to the package unit's oil supply pipe (after the oil cooler).
Protecting from high pressure (HP)
This device stops the compressor operation when the discharge pressure abnormally rises
due to mishandling of the compressor or stoppage of cooling water supply to the condenser.
This device prevents explosion of the equipment and components.
Install a pressure sensing port to the discharge pipe.
Protecting from intermediate pressure (IP)
This device controls the compressor appropriately when the intermediate pressure exceeds
the set value. In some cases, this device stops the compressor operation.
Install a pressure output port to the package unit's intermediate gas pipe (or compressor's
intermediate gas pressure output port).
Protecting from suction pressure drop (LP)
This device stops the compressor operation when the suction pressure becomes below the
set value.
Install a pressure sensing port to the suction pipe.
Protecting from oil pressure (OP)
This device stops the compressor operation when lubricating oil supply is not sufficient, the oil
filter is clogged, the refrigerant is mixed into the lubricating oil, and oil supply pressure
difference (from discharge pressure) becomes below the set value.
This device is to protect the compressor from wear and burnout.
Install a pressure sensing port to the package unit's oil supply pipe (after the oil pump) and the
discharge pipe.
Protecting from motor overcurrent (OCR)
This device controls the compressor appropriately when the current exceeds the set value. In
some cases, this device stops the compressor operation.
This device is normally installed in the compressor operation controller.

2202L5JE-DA-C5-N_2015.05.
1. Safety
Compound 2-stage Screw Compressor 1.4 Safety Devices
1612LSC Speed Increaser Type 1-8
Connection Positions and Settings
Specify the connection position and setting for each compressor protective device, and make sure
to provide users of this product with them.
Make sure that the set values do not exceed the operating limits shown in Chapter 2, section 2.3.2
and Table 2-2 of this manual.
Inspection Method/Cycle
Compressor protective devices require operation tests and confirmation of the settings calibration
before test run as well as at regular intervals.
Specify the inspection methods/intervals of the compressor protection devices, and make sure to
provide users of this product with such information.
In the operation test, check that alarms and protective devices operate normally
by using devices such as pressure tester. Do not operate the compressor with all
the valves closed, or in any other dangerous conditions.
If the protection from oil pressure (OP), high pressure (HP) activates, do not
restart operation until the cause of activation is removed.

2202L5JE-DA-C5-N_2015.05.
2 Compressor Specifications and Structure
Compound 2-stage Screw Compressor 2.1 Overview of the MYCOM 1612LSC Speed Increaser Type
1612LSC Speed Increaser Type 2-1
2 Compressor Specifications and Structure
2.1 Overview of the Compound 2-stage
Screw Compressor 1612LSC Speed Increaser Type
The 1612LSC is a compound screw compressor integrating two stages of compressor
into a single body. The 1612LSC has been developed based on the LSC model of the 1612C Series
compressors —our most popular and long-selling products boasting the delivery of over 1000 units
worldwide since they were first put on the market— by adding the speed increaser gear system to
provide it with optimum performance for applications to ultra-cold and rapid freezing storage systems in
bonito and tuna fisheries.
Generally, screw compressors use oil injection to keep discharge temperature low during operation
without loss of volumetric efficiency even at high compression ratios, with singles-stage usage possible
even at evaporative temperatures near −40 °C.
However, for low-temperature regular usage, to improve KW/RT (the ratio of power consumption versus
cooling ability), a 2-stage compression method is used. To use standard-type screw compressors in a
2-stage compression method, at least two screw compressors must be combined so that there is a
high-stage and a low-stage, which requires multiple sets of machinery, power, and utilities, etc. to be
installed.
This 2-stage screw compressor combines these two units into one compound machine.
2.2 Model Designation of the Compressor
This manual describes the 1612LSC-*B*-52, -62, -53, -63, and -54 speed increaser type models.
The meaning of the type designation stamped on the nameplate of the compressor MODEL column is
as follows.
＊1612LSC-＊B＊-52（62, 53, 63, 54）
2, 3 or 4：Speed increaser gear ratio specification
( refer to the specifications table on the next page.)
5：Power frequency 50Hz （6：60Hz）
Vi of the high-stage discharge port specification (volume ratio),
asstandardLport or Mport
Means the machine (low-stage) booster
Vi of the low-stage discharge port specification (volume ratio),
as standard Lport or Mport
Means two-stage machine single unit
Shows the specifications of the high-stage rotor length,
onlySfor accelerator speed increaser type
Shows the specifications of the low-stage rotor length, only L for speed increaser type
High-stage rotor diameter of 125
Low-stage rotor diameter of 160
Means the working fluid
(Example: N = ammonia, F = Freon, P = Propane , HE = helium)

2202L5JE-DA-C5-N_2015.05.
2 Compressor Specifications and Structure
Compound 2-stage Screw Compressor 2.3 Compressor Specifications
1612LSC Speed Increaser Type 2-2
2.3 Compressor Specifications
2.3.1 Standard Specifications
Table 2-1 1612LSC Speed Increaser Type Screw Compressor Specifications
Item 1612LSC Speed Increaser type
52 62 53 63 54
Product mass kg 560
Applied frequency Hz 50 60 50 60 50
Motor Poles - 4P 4P 2P 2P 2P
Speed increaser gear ratio - 1.809 1.809 1.220 1.220 1.472
Male rotor rotational speed min-1 2610 3150 3610 4350 4350
Female rotor rotational speed min-1 1740 2100 2407 2900 2900
Low-stage swept volume m3/h 551 665 762 918 918
High-stage swept volume m3/h 174 210 241 290 290
Applied refrigerant - Ammonia, Hydrofluorocarbon, other
Design pressure MPa 2.6
Capacity control range (Actual load) % 10 to 100
Rotation direction - Crockwise viewed from motor
Connection pipe size
Suction flange low-stage - MYCOM 125A (5″)
Discharge flange low-stage - MYCOM 80A(3″)
Suction flange high-stage - MYCOM 80A (3″)
Discharge flange high-stage - MYCOM 65A(2½″)
Journal lubricating oil supply
(low-stage) - Rc1/2
Journal lubricating oil supply
(high-stage) - Rc3/8
Oil injection lubricating oil supply - Rc3/8
Mechanical seal and speed increaser
gear lubricating oil supply - Rc1/4
Capacity control - Load: Rc1/4, Unload: Rc3/8
In this manual unless otherwise noted, pressure units MPa represents the gauge pressure.
For usage temperature ranges and pressure ranges, refer to Section2.3.2 “Operation Limits”.