mycom i125S User manual

2200M4JE-HO-iS2-N_2014.04.
i-Series Screw Compressor
Instruction Manual i125S / i125L
i160S / i160M / i160L
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 is subject to change without prior notice.
This manual is applied to each compressor after the serial number
shown below.
i125S: 8750303 i125L: 8770301
i160S: 8710055 i160M: 8720018 i160L: 8730030

2200M4JE-DA-iS2-N_2014.04.
Preface
Screw Compressor i-series i
Preface
Thank you for purchasing our i-series screw compressor (hereinafter referred to as "this
product").
This instruction manual (hereinafter referred to as "this manual") provides safety information and
operation and maintenance procedures, so that users correctly understand how to handle this product
and, as a result, can use it safely and efficiently.
Before installing or using this product, make sure you read this manual.
Keep this manual in a safe place near this product for quick reference.
Revision History
Title Document No. First edition issue date
i-Series Screw Compressor
Instruction manual 2200M4JE-DA-iS2-N_2014.04. April 28, 2014
Revision
No. Issue Date Contents of revisions (modified clause, page, and details) Created/ approved by:
00 April 28, 2014 Newly issued as applicable to the product after May
2014, due to modification of the i-series specifications. Kawamoto
/ Ikeda, Hirao

2200M4JE-DA-iS2-N_2014.04.
Warranty and Disclaimer
Screw Compressor i-series 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.
Disclaimer Clauses (Exclusion of Warranty Clauses)
Please note that we disclaim any responsibility for damage or malfunction to this product, as described
in the following items.
Any failure or damage caused by an act of God including, but not limited to, windstorm, heavy
rain, flood, high tide, earthquake, subsidence of ground, lightning strike, fire, etc.
Malfunctions, damage, or degradation due to misuse or unacceptable use of the product
(including improperly storing the product outdoors or under too hot/humid conditions,
excessively frequent liquid flow-back operation, extremely frequent start-stop cycles, etc.).
Any failure or damage caused by other systems or devices not supplied by MAYEKAWA
including operation control methods of them.
Any failure or damage caused by the use of any refrigerant (or gas) or lubricant not applicable
to this product.
Any failure or damage caused by the performance of maintenance or inspection procedures
not recommended by MAYEKAWA.
Any failure or damage caused by the use of any other than the genuine parts of MAYEKAWA.
Any failure or damage caused by any conversion or modification of the product other than as
instructed by MAYEKAWA.
Direct or indirect production warranty or all other related warranties that arose due to a failure
or damage of this product.

2200M4JE-DA-iS2-N_2014.04.
Important Information
Screw Compressor i-series iii
Important Information
Intended Use of this Product
This product is a general-purpose screw compressor for refrigeration and cold storage. Do not use this
product for any other purposes that are not intended for or which depart from the specifications. For
specifications of this product, refer to "2.3 Compressor Specifications".
Please perform the maintenance items described in this manual by using safe and assured procedures.
Important Information for Safe Use of this Product
Although MAYEKAWA has paid a lot of attention to safety measures for this product, all hazards
including potential hazards caused by human errors, or due to environmental conditions can not be
anticipated.
As there are too many items to be strictly observed or prohibited when using this product, it is
impossible to inform all of them through this manual or warning labels. Therefore, when operating this
product, pay extreme caution on personnel safety as well as on items described in this manual.
Important rules for safety work with this product that apply to all workers including managers and
supervisors are listed below.
Please read this manual before using this product. Fully understand the instructions provided there,
and be sure to perform the safety procedures described in this manual.
Operation, maintenance, and inspection of this product should be performed by qualified
personnel educated about the fundamentals of this product and trained about hazards
involved and measures to avoid danger.
Do not allow any person other than those educated on the fundamental expertise of this
product and trained about hazards involved and measures to avoid dangers to approach this
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. Do not use this product for any purpose other than intended.
Replace the parts with the genuine parts.
Not only workers but also managers should actively participate safety and health activities in
the workplace to prevent accidents.
When closing or opening a valve during work, make sure to apply lockout/tagout to prevent
the valve from being accidentally closed or opened 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.

2200M4JE-DA-iS2-N_2014.04.
Important Information
Screw Compressor i-series iv
[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.
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 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", this product may be turned on if
the power is supplied from outside the refrigeration system or cold storage unit. Make sure the power
supply on the power source side is shut off, and perform lockout/tagout to prevent the 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.
This manual is in English. If any other language is required, it is the customers’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 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 actual
product.
If this manual is lost or damaged, immediately request to one of our local sales offices or
service centers for a new manual. Using this product without the manual may result in safety
issues.
When you resell this product, be sure to transfer this manual to the next owner.


2200M4JE-DA-iS2-N_2014.04.
Important Information
Screw Compressor i-series v
Structure of This Manual
Chapter/Section Title Description
Preface Describes the outline of this manual and how to read this manual.
Warranty and Disclaimer Describes what MAYEKAWA 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 safety information for the worker, safety rules for this product, and management details regarding the work safety that is
required for handling this product.
2. Compressor Specifications
and Mechanisms Describes the main components of this product, functional information, specification, operating limits, drawings, and parts list.
3. Installation Describes the installation procedure of this product.
4. Operation of Compressor
and the Package Unit Describes the precautions for operating this product.
5. Maintenance Describes sections and period for inspecting, and assembly and
disassembly of this product.
6. Troubleshooting Describes troubleshooting methods for this product in case problems
occur during operation of this product.
7. Related Documents List of disassembly tools for i-series compressor, and other information
Appendix : Packaging Points Describes basic points for the design and manufacture of compressor
package unit.
Contact Information Describes contact information for our local sales offices or service
centers, which are for ordering genuine parts.

2200M4JE-DA-iS2-N_2014.04.
Table of Contents
Screw Compressor i-series vi
Table of Contents
Preface ････････････････････････････････････････････････････････ⅰ
Revision History ･･････････････････････････････････････････････････････････････ⅰ
Warranty and Disclaimer･･･････････････････････････････････････ⅱ
Warranty Clauses................................................................................................... ⅱ
Disclaimer Clauses (Exclusion of Warranty Clauses) ........................................ 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................................................................................. ⅴ
Table of Contents･･･････････････････････････････････････････････ⅵ
Chapter 1 Safety
1.1 Observation/Prevention (DOs and DON'Ts) ..............................................1-1
1.1.1 DOs...................................................................................................................... 1-1
1.1.1.1 DOs on Operation........................................................................................1-1
1.1.1.2 DOs on Maintenance................................................................................... 1-1
1.1.1.3 DOs on Lockout/Tagout after Shutting Off the Power .................................1-1
1.1.1.4 DOs about Personal Protective Gear..........................................................1-2
1.1.1.5 DOs about Handling of Hazardous and Toxic Substances .........................1-2
1.1.1.6 DOs about Handling Emergency Situations................................................ 1-2
1.1.1.7 DOs about Waste Oil, Fluid, and Materials................................................. 1-2
1.1.1.8 Other DOs ...................................................................................................1-2
1.1.2 DON'Ts................................................................................................................1-2
1.2 Warnings.......................................................................................................1-3
1.2.1 Types and Meanings of 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 of Motor Main Power and Control Power
(with Lockout/Tagout Mechanism)....................................................................... 1-6
1.4.3 Compressor Protective Devices.................................................................1-7
Chapter 2 Configuration and Specification of Compressor
2.1 Features of i-Series Compressor.........................................2-1
2.2 Model Designation of the Compressor......................................................2-1

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Table of Contents
Screw Compressor i-series vii
2.3 Compressor Specifications ........................................................................2-2
2.3.1 Specifications.......................................................................................................2-2
2.3.2 Operation Limits................................................................................................... 2-3
2.3.3 Alarm Set Values................................................................................................. 2-4
2.3.4 Outer Dimensions................................................................................................ 2-5
2.4 Configuration of Compressor...................................................................2-10
2.4.1 Sectional View...................................................................................................2-10
2.4.2 Development View of Parts ............................................................................... 2-16
2.4.3 Parts Configuration Table.................................................................................. 2-18
2.5 Mechanisms ...............................................................................................2-24
2.5.1 Basics of the Screw Compressor ......................................................................2-24
2.5.2 Suction Process.................................................................................................2-24
2.5.3 Compression Process........................................................................................2-25
2.5.4 Discharge Process............................................................................................. 2-25
2.5.5 About Volume Ratio (Vi)....................................................................................2-25
Chapter 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 Transfer................................................................................................................3-1
3.2.4 Preparation for Installation...................................................................................3-3
3.2.5 Installation............................................................................................................3-3
3.2.5.1 Piping Connection .......................................................................................3-3
3.2.5.2 Equipment and Devices for Protection of the Compressor.........................3-3
3.2.6 Airtightness Test..................................................................................................3-4
3.2.7 Lubricant Charge................................................................................................. 3-4
3.2.7.1 Initial Charge of Lubricant............................................................................3-4
3.2.7.2 Additional Charge of Lubricant....................................................................3-5
3.2.8 Charge of Refrigerant.......................................................................................... 3-5
3.2.9 Check after Installation........................................................................................3-5
Chapter 4 Operation of Compressor and Unit
4.1 Lubricant (Refrigerant Oil) ..........................................................................4-1
4.1.1 Precautions for Selecting the Lubricant............................................................... 4-1
4.1.2 Recommended Lubricants...................................................................................4-2
4.1.2.1 Recommended Lubricants forAmmonia Refrigerant .................................. 4-2
4.1.2.2 Oils for Systems Using HFC Refrigerants...................................................4-3
4.1.3 Change of Lubricant Brand..................................................................................4-3
4.1.4 Precautions for Handling Lubricant .....................................................................4-3
4.2 Precautions for Operation...........................................................................4-4
4.2.1 Prevention of Liquid Flow-back ...........................................................................4-4

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Table of Contents
Screw Compressor i-series viii
4.2.2 Purging of Non-Condensable Gases...................................................................4-4
4.2.3 Action for Stopping the Compressor for Long Period of Time.............................4-5
Chapter 5 Maintenance and Inspection
5.1 Precautions for Maintenance and Inspection............................................5-1
5.2 Maintenance and Inspection List................................................................5-2
5.2.1 Daily Management............................................................................................... 5-2
5.2.2 Periodical Inspection............................................................................................5-4
5.2.3 Guidelines for Compressor Overhaul Frequency................................................5-5
5.3 Management of Lubricant ...........................................................................5-6
5.3.1 Lubricant Management Criteria ........................................................................... 5-6
5.3.2 Lubricant Replacement Frequency......................................................................5-6
5.4 Compressor Disassembly Preparation......................................................5-7
5.4.1 Tools for Disassembly .........................................................................................5-7
5.4.2 Replacement Parts..............................................................................................5-8
5.4.3 Refrigerant Gas Treatment.................................................................................. 5-8
5.4.3.1 Valves Used.................................................................................................5-8
5.4.3.2 Refrigerant Gas Recovery...........................................................................5-8
5.4.4 Removing Parts Connected to the Unit............................................................... 5-9
5.4.5 Removing and Lifting the Compressor.............................................................. 5-10
5.4.6 Removing Oil from Compressor........................................................................5-10
5.5 Disassembly and Inspection.....................................................................5-11
5.5.1 Mechanical seal................................................................................................. 5-11
5.5.1.1 Disassembly...............................................................................................5-11
5.5.1.2 Inspection .................................................................................................. 5-12
5.5.2 Bearing Cover....................................................................................................5-13
5.5.2.1 Disassembly..............................................................................................5-13
5.5.2.2 Inspection...................................................................................................5-13
5.5.3 Balance Piston...................................................................................................5-14
5.5.3.1 Disassembly..............................................................................................5-14
5.5.3.2 Inspection .................................................................................................. 5-14
5.5.4 End Cover..........................................................................................................5-14
5.5.5 Thrust Bearings .................................................................................................5-14
5.5.5.1 Disassembly..............................................................................................5-15
5.5.5.2 Inspection .................................................................................................. 5-15
5.5.6 Bearing Head.....................................................................................................5-16
5.5.6.1 Disassembly..............................................................................................5-16
5.5.6.2 Inspection .................................................................................................. 5-16
5.5.7 Rotors ................................................................................................................5-16
5.5.7.1 Disassembly..............................................................................................5-16
5.5.7.2 Inspection .................................................................................................. 5-16
5.5.8 Radial Bearing...................................................................................................5-17
5.5.8.1 Disassembly..............................................................................................5-17
5.5.8.2 Inspection .................................................................................................. 5-17
5.5.9 Suction Strainer and Check Valve.....................................................................5-17

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Table of Contents
Screw Compressor i-series ix
5.5.9.1a Disassembly (i125)....................................................................................5-17
5.5.9.1b Disassembly (i160).................................................................................... 5-17
5.5.9.2 Inspection .................................................................................................. 5-18
5.5.10 Unloader ............................................................................................................ 5-18
5.5.10.1 Disassembly..............................................................................................5-18
5.5.10.2 Inspection .................................................................................................. 5-18
5.6 Reassembly................................................................................................5-19
5.6.1 Unloader ............................................................................................................5-20
5.6.2 Rotor and Inner Ring of Radial Bearing............................................................. 5-20
5.6.3 Bearing Head.....................................................................................................5-21
5.6.4 Outer Ring of Radial Bearing.............................................................................5-21
5.6.5 Suction Strainer and Check Valve.....................................................................5-22
5.6.5.1 i125 Series.................................................................................................5-22
5.6.5.2 i160 Series.................................................................................................5-22
5.6.6 Adjustment of Thrust Bearing and End Clearance............................................5-23
5.6.6.1 End Clearance Measurement....................................................................5-25
5.6.6.2 End Clearance Adjustment........................................................................5-26
5.6.6.3 Tightening after End Clearance Adjustment..............................................5-27
5.6.7 Balance Piston...................................................................................................5-27
5.6.8 Bearing Cover....................................................................................................5-28
5.6.9 Mechanical seal................................................................................................. 5-28
5.6.10 End Cover..........................................................................................................5-31
Chapter 6 Troubleshooting
 Table 6-1 Troubleshooting................................................................................6-1
Chapter 7 Related Documents
7.1 Tightening Angles for Lock Nuts................................................................7-1
7.2 List of Tools for Disassembly of i-Series...................................................7-2
Appendix
Basic Points for Design and Manufacturing of Compressor
Package Unit
Contact Information
HowtoOrder GenuineParts
Sales Offices/Service Centers

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.1 Observation/Prevention (DOs and DON'Ts)
1-1
Chapter 1 Safety
1.1 Observation/Prevention (DOs and DON'Ts)
1.1.1 DOs
1.1.1.1 DOs on Operation
Make sure to attach safety and protective devices to the package unit.
The safety devices and protection systems must be regularly checked for their normal
operation.
If any safety device or protection system does not function normally or this product operates in
an abnormal manner, immediately stop the work and contact your supervisor. When the
system is to be restarted, you must observe the decision and instruction of the supervisor.
If this product has stopped operation due to an unknown cause, immediately contact your
supervisor. Before restarting the system, you must seek the decision and instruction of the
supervisor.
Depending on the type of refrigerant used, its leakage may generate a bad smell or poisonous
gas. Be sure to sufficiently ventilate the room while the machine is operated.
Regarding the characteristics of the refrigerant and lubricant, e.g., corrosiveness, degradability,
and toxicity, be sure to obtain the Safety Data Sheet (SDS) of them and follow the instructions
given.
When this product is not to be used for some period of time, close the suction (side) and
discharge (side) stop valves and shut off the motor power source, heater power, and control
power.
1.1.1.2 DOs on Maintenance
Prepare work procedures based on a work plan. Be sure to perform danger forecasting before
starting the work.
If two or more people are to work together, be sure to mutually check the work details and
procedures before the work. During the work, always keep track of the other workers’ actions.
Before working on any troubleshooting during operation, before setting up this product, before
cleaning work, and before conducting maintenance or inspection work, be sure to shut off the
motor power source, control power, and power to other equipment, perform lock-out and
tag-out procedures, and take effective measures to prevent any accidental power-on during
the work.
Before working on any troubleshooting during operation, before setting up this product, before
cleaning work, and before conducting maintenance or inspection work, be sure to check that
the internal pressure of this product and the refrigeration/cold storage unit is at the
atmospheric pressure.
Depending on the type of refrigerant used, it may generate a bad smell or poisonous gas or
could cause an oxygen deficient atmosphere. Before starting the work, measure the oxygen
content in the work area, as appropriate, and provide sufficient ventilation. The ventilation
must be continued steadily until the work is completed.
For the properties of refrigerant and lubricant (corrosiveness, decomposability or toxicity), be
sure to obtain the Safety Data Sheet (SDS) and follow the relevant information.
After work, the tools used must be returned to the predefined location. Be sure not to leave
them inside the package unit.

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.1 Observation/Prevention (DOs and DON'Ts)
1-2
1.1.1.3 DOs on Lockout/Tagout after Shutting Off the Power
Alock-out/tag-out mechanism must be installed for the main circuit breakers that supply power
to the motor and power to the control system. The lock-out/tag-out after power down is a very
effective means to ensure the safety when two or more workers are working on the system at
the same time, as it can prevent possible injury of workers that may be caused by accidental
power-on of the driving source by one of the workers.
If there is a risk of danger, especially during cleaning, maintenance/inspection, or
troubleshooting work, be sure to let the workers perform the lock-out/tag-out procedures after
the motor main power and control power has been shut off.
Because the workers may neglect to perform the lock-out/tag-out procedures or cut-off the
power in the following situations, be sure to instruct them to strictly follow the correct
procedure by clearly identifying the work that require lock-out/tag-out and the reasons why it is
needed.
As it is a cumbersome task for the workers to cut off the motor main power and control
power and use lock-out/tag-out devices before starting the work, they might neglect to do
it.
The workers might determine by themselves that it should be OK just to cut off the motor
main power and control power, and not use any lock-out/tag-out devices.
1.1.1.4 DOs 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 machine.
1.1.1.5 DOs about Handling of Hazardous and Toxic Substances
Obtain Safety Data Sheet (SDS) from manufacturers of hazardous and toxic substances.
Check the MSDS and follow the handling instructions recommended by the manufacturers to
handle and store those substances.
1.1.1.6 DOs about Handling Emergency Situations
Formulate an emergency action plan complying with the regulations, and post it on a safe
place.
1.1.1.7 DOs 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 DOs
Keep clean the floor around the entire 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.

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.2 Warnings
1-3
1.1.2 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 following two measures are taken for this product to let workers pay attention to possible dangers.
Warnings described in this manual
Safety labels affixed on the equipment main body
* No safety labels are affixed to the compressor itself which this manual is intended for.
For details about the warning labels affixed to the package unit, refer to the instruction
manual of the unit.
1.2.1 Warning Notices in this Manual
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 Types and Meanings of Warnings
Type Meaning
Indicates that there is a high risk of death or severe injury if it is not avoided.
Indicates that there is a potential risk of death or severe injury if it is not avoided.
Indicates that there is a risk of light or medium injury if it is not avoided.
Indicates that there is a potential risk of property damage if it is not avoided.

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.3 Residual Risks
1-4
1.3 Residual Risks
The following information assumes that this product is operated or inspected/maintained as part of a
general package unit for refrigeration/cold storage. It is impossible to predict all the risk sources
involved in actual use of the package unit.
Devise appropriate countermeasures for hazardous sources in your systems.
Table 1-2 Hazardous Sources
Hazardous
sources Predicted hazard Measures to be taken in operation
Measures to be taken
during cleaning,
inspection or parts
replacement
A Motor and
compressor
coupling
Caught in or
entangled in due to
contact
Install cover on the
opening of coupling,
or 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
suction casing 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 Compressor
discharge
casing and
discharge
piping
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.
E Solenoid valve
for controlling
compressor
capacity
Electric shock caused
by contact with live
wires or electrical
leakage
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.
F Package Unit
Check valve,
service valve
and joint in
each section
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 Package Unit
Solenoid valve
or motor
operated
valve
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.

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.3 Residual Risks
1-5
A A
A
A
C
C
C
C
D
D
E
E
Hazardous
sources Predicted hazard Measures to be taken in operation
Measures to be taken
during cleaning,
inspection or parts
replacement
H Package Unit
Electric
components in
each part (oil
heater,
protective
device, 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 drain 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. —
Figure 1-1 Hazardous sources (Compressor)

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.4 Safety Devices
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 countermeasures.
1.4.1 Emergency Stop Button
Overview/Function/Purpose
The emergency stop buttons are used for emergency shutdown of this product when an emergency
situation arises.
Installation Positions
On the control board and in the operation control room
Stop/Restoration Methods
For information on how to stop or restore the emergency stop button, refer to the instruction manual
of the package unit.
Inspection Method/Interval
The emergency stop buttons must be tested before commissioning and must also be periodically
re-tested after that.
For the inspection method and interval for the emergency stop button, refer to the instruction
manual of the package unit.
1.4.2 Circuit 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/Interval
For the inspection method and frequency for the lockout/tagout mechanism, refer to the instruction
manual of the package unit.

2200M4JE-HO-iS2-N_2014.04.
Chapter 1 Safety
Screw Compressor i-series 1.4 Safety Devices
1-7
1.4.3 Compressor Protective Devices
Be sure to adjust the set values and check operation of the protective devices when
commissioning. Also, after that, the regular operation confirmation is necessary.
Install necessary protection devices shown in section 2.3.3 "Alarm Set Values" in this manual chapter 2.
Also, install the following protection devices that are not indicate in section 2.3.3, as occasion
demands.
Protection from motor over current (OCR)
This device activates and applies appropriate control when the current equal to or higher than the
set level flows. In some cases, this device stops the compressor operation.
For more information about setting and installation of this device, please refer to the instruction
manual of the motor.
Protection from oil level decrease
In case of the oil supply by differential pressure, install a protection device to the oil separator for
protect form oil level decrease. Since there is a possibility that alarm for protection from lubricating
differential pressure decrease does not activate even if the amount of lubricant is insufficient.
No Water Alarm
If you use water cooling oil cooler and/or water cooling condenser, a suspension of water supply
protection is necessary.
For more information about setting and installation of this protection device, please refer to the
instruction manual of the motor or the like used in the cooling water system.
In the operation test, check that alarms and switches 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) or high pressure (HP) activates, do not restart
operation until the cause of activation is removed.

2200M4-JE-HO-iS2-N_2014.04.
Chapter 2 Compressor Specifications and Configuration
Screw Compressor i-series 2.1 Features of i-Series Compressor
2-1
Chapter 2 Compressor Specifications and Configuration
2.1 Features of i-Series Compressor
i-series compressor enables designers to design highly reliable and most compact
refrigerating unit. It has a lot of features.
Centering is made unnecessary by mounting the motor using a flange.
By mounting the motor using a flange eliminates the need of the troublesome motor centering before
starting the equipment.
Suction strainer and check valve built-in compressor
This compressor has built-in suction strainer and check valve which enable easy maintenance.
No oil pump required in differential pressure oil supply system
This compressor employs roller bearings which let lubrication oil reserved in part even when the
machine is stopped. Accordingly, no lubrication failure will occur even with differential pressure oil
supply system which has no oil pump installed.
3-step (100%, 75%, 50%) unloader
As it has a 3-step (100%, 75%, 50%) unloader built-in, flow adjustment can be done easily.
Inverter-controlled speed control is available.
High efficiency, and low vibration and noise
Use of original screw rotor profile attains high efficiency, and low vibration and noise.
2.2 Model Designation of the Compressor
This manual describes i125*-* and i160*-* models.
The meaning of the type designation, which is engraved on the MODEL column of the compressor
nameplate, is as follows.
i 1 2 5 * - *
Specifications of Vi (volume ratio) of the discharge port, which is L (Vi=2.63), M(Vi=3.65)
or H(Vi=5.80)
Specifications of rotor length, which is Sor L(i125) and S, Mor L(i160)
Rotor diameter, which is 125 or 160
Indicatesi-Series.

2200M4-JE-HO-iS2-N_2014.04.
Chapter 2 Compressor Specifications and Configuration
Screw Compressor i-series 2.3 Compressor Specifications
2-2
2.3 Compressor Specifications
2.3.1 Specifications
Table 2-1 Specifications of i-Series Compressor
Items Model
i125S i125L i160S i160M i160L
Single unit weight *Note 1 kg 530 570 640 680 720
Motor connection NEMA - C-FACE D-FLANGE
IEC - FF400, FF500 FF600
Standard speed 50Hz/60Hz min-1 2950/3550
Rotation direction - Clockwise as viewed from motor
Displacement 50Hz/60Hz m3/h 197/237 296/356 415/499 519/624 622/749
CFM 116/139 174/210 244/294 305/367 366/441
Refrigerant - R717 / R404A/ R507A / R134a
Design pressure *Note 2 MPa 2.6 (Applies to i-series compressors manufactured
and shipped in May 2014 or after.)
Capacity control - 3-step (100%, 75%, 50%) unloader
Connected
pipe size
Suction flange - MYCOM 100A (4") ANSI ＃300 5"
Discharge flange - MYCOM 65A
(2-1/2") ANSI ＃300 3"
Oil inlet port - Rc1/2 Rc1
Economizer - Rc3/8 Rc3/4
Aquamizer
(Liquid injection) - Rc1/4 Rc1/2
 Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this manual.
 For limits of working temperature and pressure, see "2.3.2 Operation Limits" in this manual.
*Note 1: Data include a weight of a flange motor spacer of the NEMA standards.
*Note 2: The design pressure varies according to each area, laws and ordinances of the country.
The design pressure of this list is the maximum value of the compressor. Therefore, the
real design pressure may become less than this value according to the law.
Please confirm real pressure on a name plate and individual specifications.

2200M4-JE-HO-iS2-N_2014.04.
Chapter 2 Compressor Specifications and Configuration
Screw Compressor i-series 2.3 Compressor Specifications
2-3
2.3.2 Operation Limits
Table 2-2 Operation Limits of i-Series Compressor
Items Operation limits *Note 1 Permissible limit
Speed min-1 2950@50Hz
3550@60Hz 125S, 160S: Max. 4500 *Note 2
125L, 160M, 160L : Max. 3550
Discharge pressure MPa 1.0 - 1.9 Max. 1.9
Suction pressure MPa 0.02 - 0.35 Max. 0.6
Min. -0.05
Differential pressure for lubrication
(Po - Ps) *Note3 MPa ≥0.5 Min. 0.5 *Note 4
Discharge gas temperature °C Condensing
temperature + 15 to 90 Max. 90
Superheating degree of suction gas °C 5 - 20 -
Oil supply temperature °C 30 - 60 Max. 80 BBSE
*Note 2
Min. 30
Supply oil viscosity
(kinematic viscosity) mm2/s 13 - 40 Min. 13
Max. 300 (At start-up time)
Vibration standard value at shipment μm (Half amplitude) 20 -
Noise standard value at shipment dB (A) 125S, L, 160S, M: 84
160L: 85 -
Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this manual.
*Note 1:For operations outside the operation limits, consult our compressor manufacturing division.
*Note 2: When performing a speed-increasing operation by inverter at 70 °C or above oil temperature,
contact our compressor manufacturing division to confirm the temperature on the mechanical seal
sliding face.
*Note 3: Po = Oil supply pressure, Ps = Suction pressure
*Note 4: This value excludes the start-up of the compressor. Refer to Note 2 in the next section.
Repeated startup and stop in a short period is harmful not for the startup devices
and electric machinery but also for the compressor itself. For information on the
start/stop limitations, refer to each instruction manual.
Wait at least 15 minutes after stopping the compressor before restarting it.