Huawei NetCol5000-A025 User manual

NetCol5000-A025 In-row Air Cooled Smart
Cooling Product
User Manual (300 mm Width)
Issue 15
Date 2020-12-10
HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2020. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and
the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specied in the contract, all statements,
information, and recommendations in this document are provided "AS IS" without warranties, guarantees
or representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every eort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: https://e.huawei.com
Issue 15 (2020-12-10)Copyright © Huawei Technologies Co., Ltd. i

About This Document
Purpose
This document describes the NetCol5000-A025, a in-row air cooled smart cooling
product (NetCol5000-A for short), in terms of its safety precautions, product
description, installation guide, ACC introduction commissioning guide, operation
and maintenance. It helps users rapidly learn the operation and maintenance
(O&M) of the NetCol5000-A.
If electric heater, humidier and water pump are not congured, skip the
commissioning procedures for the electric heater, humidier and water pump.
Intended Audience
This document is intended for:
● Sales personnel
● Technical support personnel
● System engineers
● Hardware installation personnel
● Commissioning engineers
● Data conguration engineers
● Maintenance personnel
Symbol Conventions
The symbols that may be found in this document are dened in the following
table.
Symbol Description
Indicates a hazard with a high level of risk
which, if not avoided, will result in death or
serious injury.
NetCol5000-A025 In-row Air Cooled Smart Cooling
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User Manual (300 mm Width) About This Document
Issue 15 (2020-12-10) Copyright © Huawei Technologies Co., Ltd. ii

Symbol Description
Indicates a hazard with a medium level of risk
which, if not avoided, could result in death or
serious injury.
Indicates a hazard with a low level of risk
which, if not avoided, could result in minor or
moderate injury.
Indicates a potentially hazardous situation
which, if not avoided, could result in equipment
damage, data loss, performance deterioration,
or unanticipated results.
NOTICE is used to address practices not related
to personal injury.
Supplements the important information in the
main text.
NOTE is used to address information not
related to personal injury, equipment damage,
and environment deterioration.
Change History
Changes between document issues are cumulative. The latest document issue
contains all the changes made in earlier issues.
Issue 15 (2020-12-10)
Updated section "Replacing the Indoor Fan."
Issue 14 (2020-07-21)
Added the description of versions that do not support Modbus-TCP.
Issue 13 (2020-07-03)
Added the description of versions that do not support SNMP.
Issue 12 (2020-03-16)
Optimized the Preparations and WebUI Login section.
Issue 11 (2019-12-20)
Updated the safety information.
NetCol5000-A025 In-row Air Cooled Smart Cooling
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User Manual (300 mm Width) About This Document
Issue 15 (2020-12-10) Copyright © Huawei Technologies Co., Ltd. iii

Issue 10 (2019-11-30)
Updated the cable description.
Issue 09 (2019-07-30)
Updated the alarm reference section.
Issue 08 (2019-01-15)
Updated the manual name and so on.
Issue 07 (2018-12-10)
Updated the city altitude.
Issue 06 (2018-09-10)
Updated the startup wizard.
Issue 05 (2018-06-21)
Added the wet lm humidier.
Issue 04 (2018-03-19)
Optimization and Maintenance.
Issue 03 (2017-01-23)
Updated contents in the controller section.
Issue 02 (2016-10-25)
Updated the description about teamwork networking and monitoring.
Added the description about replacing the lter dryer.
Issue 01 (2016-05-04)
This issue is the rst ocial release.
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User Manual (300 mm Width) About This Document
Issue 15 (2020-12-10) Copyright © Huawei Technologies Co., Ltd. iv

Contents
About This Document................................................................................................................ ii
1 Safety Information.................................................................................................................. 1
1.1 General Safety.......................................................................................................................................................................... 1
1.2 Personnel Requirements....................................................................................................................................................... 4
1.3 Electrical Safety........................................................................................................................................................................4
1.4 Installation Environment Requirements.......................................................................................................................... 6
1.5 Mechanical Safety................................................................................................................................................................... 8
1.6 Cooling System Safety.........................................................................................................................................................10
1.7 Others....................................................................................................................................................................................... 11
2 Product Description.............................................................................................................. 12
2.1 Model Description................................................................................................................................................................ 12
2.2 Indoor Unit Components....................................................................................................................................................13
2.3 Controller................................................................................................................................................................................. 15
2.3.1 Appearance and Ports...................................................................................................................................................... 15
2.3.2 Function and Features..................................................................................................................................................... 17
2.4 Monitoring System............................................................................................................................................................... 18
2.5 Application Environment.................................................................................................................................................... 21
2.6 Technical Specications...................................................................................................................................................... 25
3 Installation Guide..................................................................................................................27
3.1 Installation Preparations.................................................................................................................................................... 27
3.1.1 Preparing Tools...................................................................................................................................................................27
3.1.2 Material Preparations...................................................................................................................................................... 30
3.1.2.1 (Optional) Refrigerant R410A................................................................................................................................... 31
3.1.2.2 (Optional) Refrigerant Oil.......................................................................................................................................... 32
3.1.2.3 (Optional) Oil Trap and Inverted Trap....................................................................................................................32
3.1.2.4 Humidier Water Inlet Pipe....................................................................................................................................... 33
3.1.2.5 Drainpipe...........................................................................................................................................................................34
3.1.2.6 Pipe Support.................................................................................................................................................................... 35
3.1.2.7 Cable...................................................................................................................................................................................36
3.1.2.8 (Engineering Procurement) Water Softener......................................................................................................... 38
3.1.3 Deployment Principles..................................................................................................................................................... 38
3.1.4 Precautions.......................................................................................................................................................................... 39
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3.1.5 Installation Layout Principles........................................................................................................................................ 40
3.2 Unpacking................................................................................................................................................................................42
3.3 Checking Nitrogen Pressure.............................................................................................................................................. 43
3.4 Removing the Cabinet Sheet Metal Fasteners............................................................................................................44
3.5 Installing the Cabinet Transport Tool.............................................................................................................................45
3.6 Removing the Transport Fasteners................................................................................................................................. 48
3.7 Installation Flowchart..........................................................................................................................................................51
3.8 Installing the Indoor Unit...................................................................................................................................................51
3.8.1 Preparing Knock-out Holes............................................................................................................................................ 51
3.8.2 Leveling Feet....................................................................................................................................................................... 53
3.8.3 (Optional) Installing the Enclosure Frame............................................................................................................... 53
3.8.4 Combining Cabinets..........................................................................................................................................................54
3.8.5 Securing the Indoor Unit................................................................................................................................................ 55
3.8.6 Installing Anchor Bae Plates......................................................................................................................................58
3.9 Exhausting Nitrogen............................................................................................................................................................ 59
3.10 Connecting Pipes................................................................................................................................................................ 60
3.10.1 Connecting Refrigerant Pipes......................................................................................................................................60
3.10.2 Connecting Drainpipes.................................................................................................................................................. 64
3.10.3 (Optional) Connecting the Humidier Water Inlet Pipe................................................................................... 67
3.10.3.1 (Optional) Connect the Water Inlet Pipe to the Electrode Humidier.....................................................67
3.10.3.2 (Optional) Connect the Water Inlet Pipe to the Wet Film Humidier..................................................... 69
3.10.4 Leakage Test with Nitrogen........................................................................................................................................ 71
3.11 Connecting Cables..............................................................................................................................................................73
3.11.1 Port for Connecting the Power Cable...................................................................................................................... 73
3.11.2 Connecting the Indoor Unit Power Cable...............................................................................................................74
3.11.3 Connecting the Outdoor Unit Power Cable........................................................................................................... 78
3.11.4 Connecting Signal Cables............................................................................................................................................. 79
3.11.4.1 Preparations Before Cable Connections...............................................................................................................79
3.11.4.2 Connecting the Outdoor Unit On/O Signal Cable........................................................................................ 82
3.11.4.3 Connecting the Water Sensor Cable..................................................................................................................... 83
3.11.5 Teamwork Networking and Monitoring................................................................................................................. 83
3.11.5.1 Main Control Module................................................................................................................................................. 84
3.11.5.2 Teamwork Network.................................................................................................................................................... 85
3.11.5.2.1 CAN teamwork networking.................................................................................................................................. 85
3.11.5.2.2 FE teamwork networking...................................................................................................................................... 88
3.11.5.3 Monitoring and organizing network.....................................................................................................................89
3.11.5.3.1 Northbound RS485 Monitoring...........................................................................................................................89
3.11.5.3.2 FE Monitoring Network......................................................................................................................................... 91
3.11.6 Connecting T/H Sensors Outside Cabinets.............................................................................................................92
3.12 Verication After Installation......................................................................................................................................... 95
4 Power-On Commissioning................................................................................................... 98
4.1 Vacuumization and Refrigerant Precharging.............................................................................................................. 98
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4.1.1 Amount Requirements for the Refrigerant and Refrigerant Oil to Be Charged.......................................... 98
4.1.2 Vacuumizing..................................................................................................................................................................... 101
4.1.3 Precharging Refrigerant................................................................................................................................................ 103
4.2 Preparing for Power-On................................................................................................................................................... 106
4.3 Viewing Software Version Information....................................................................................................................... 107
4.4 Power-On Commissioning (Software Version V200R001)................................................................................... 107
4.4.1 Powering On the Equipment.......................................................................................................................................108
4.4.2 Home Screen.................................................................................................................................................................... 108
4.4.3 Initial Conguration....................................................................................................................................................... 110
4.4.3.1 Setting Temperature and Humidity Values........................................................................................................ 110
4.4.3.2 Setting Teamwork Control Parameters................................................................................................................ 112
4.4.3.3 Setting Communications Parameters................................................................................................................... 120
4.4.3.3.1 Setting Communications Parameters (Modbus RTU Protocol)................................................................120
4.4.4 Commissioning Procedure............................................................................................................................................121
4.5 Power-On Commissioning (Software Version V200R002)................................................................................... 124
4.5.1 Power-On........................................................................................................................................................................... 125
4.5.2 Home Screen.................................................................................................................................................................... 133
4.5.3 Initial Conguration....................................................................................................................................................... 136
4.5.3.1 Setting Temperature and Humidity Values and Enabling T/H Sensors.................................................... 136
4.5.3.2 Setting Teamwork Control Parameters................................................................................................................ 138
4.5.3.3 Setting Communications Parameters................................................................................................................... 146
4.5.3.3.1 Setting Communications Parameters (Modbus RTU Protocol)................................................................146
4.5.3.3.2 Setting Communications Parameters (Modbus TCP Protocol).................................................................146
4.5.3.3.3 Setting Communications Parameters (SNMP Protocol)............................................................................. 148
4.5.3.4 (Optional) Setting WIFI Parameters..................................................................................................................... 153
4.5.4 Startup................................................................................................................................................................................ 154
4.5.5 Charging the Remaining Refrigerant....................................................................................................................... 158
4.5.6 Startup wizard.................................................................................................................................................................. 161
4.6 (Optional) Power-o........................................................................................................................................................ 169
5 WebUI.................................................................................................................................... 170
5.1 Preparations and WebUI Login...................................................................................................................................... 170
5.2 WebUI Introduction........................................................................................................................................................... 172
6 System Operation and Maintenance..............................................................................175
6.1 Components......................................................................................................................................................................... 175
6.2 Routine Maintenance Overview.................................................................................................................................... 176
6.2.1 Maintenance Tools..........................................................................................................................................................177
6.2.2 Data Record...................................................................................................................................................................... 178
6.2.3 Monthly Maintenance................................................................................................................................................... 178
6.2.4 Semiannual Maintenance............................................................................................................................................ 181
6.2.5 Yearly Maintenance........................................................................................................................................................ 181
6.3 Alarm Reference..................................................................................................................................................................182
6.4 Troubleshooting.................................................................................................................................................................. 222
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6.5 Parts Replacement............................................................................................................................................................. 227
6.5.1 Replacing the Air Filter................................................................................................................................................. 227
6.5.2 Replacing the Indoor Fan............................................................................................................................................. 228
6.5.3 Replacing the Dierential Pressure Switch............................................................................................................ 229
6.5.4 Replacing the Compressor........................................................................................................................................... 231
6.5.5 Replacing the Welded Filter Dryer............................................................................................................................ 234
6.5.6 Replacing the Threaded Filter Dryer........................................................................................................................ 237
6.5.7 Replacing the Welded Filter Dryer with the Threaded Filter Dryer...............................................................240
6.5.8 (Optional) Replacing a Wet Film Humidier........................................................................................................ 244
6.5.9 (Optional) Replacing the Humidier Cylinder...................................................................................................... 248
6.5.10 Replacing the Electric Control Box..........................................................................................................................250
6.5.11 Replacing the T/H Sensor.......................................................................................................................................... 252
6.5.12 Replacing the Module................................................................................................................................................. 253
6.5.13 (Optional) Replacing the Liquid Level Detector................................................................................................ 255
6.5.14 (Optional) Replacing the Condenser Pump........................................................................................................ 258
6.5.15 (Optional) Replacing a Humidier Water Pump...............................................................................................261
6.5.16 Replacing the LCD........................................................................................................................................................ 264
7 FAQ......................................................................................................................................... 266
7.1 Operations on the LCD..................................................................................................................................................... 266
7.1.1 Querying Temperature and Humidity Curves....................................................................................................... 266
7.1.2 Querying Logs.................................................................................................................................................................. 267
7.1.3 Querying Component Status.......................................................................................................................................267
7.1.4 Querying System Parameters..................................................................................................................................... 268
7.1.5 Querying Version Details.............................................................................................................................................. 269
7.1.6 How to View Teamwork Control Information.......................................................................................................270
7.1.7 How to Silence the Buzzer...........................................................................................................................................271
7.1.8 How Can I Handle Active Alarms?............................................................................................................................ 271
7.1.9 Deleting Historical Alarms........................................................................................................................................... 273
7.1.10 Deleting Logs................................................................................................................................................................. 274
7.1.11 Clearing the Runtime.................................................................................................................................................. 274
7.1.12 Calibrating a Sensor.....................................................................................................................................................274
7.1.13 Calibrating the Screen.................................................................................................................................................275
7.1.14 How to Modify a Password....................................................................................................................................... 277
7.1.15 How to Set Alarm Parameters................................................................................................................................. 278
7.1.16 How to Commission Single Component...............................................................................................................280
7.1.17 Which Parameters Are Restored to Default Values After Default Settings Are Operated..................281
7.1.18 Exporting Data...............................................................................................................................................................282
7.1.19 How to Export and Import a Conguration le.................................................................................................283
7.1.20 How to Import a Certicate and a Key.................................................................................................................286
7.2 WebUI Operations..............................................................................................................................................................287
7.2.1 How to Manage WebUI Users?..................................................................................................................................287
7.2.2 How to Install a Network Security Certicate?.................................................................................................... 289
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7.2.3 How Can I View Active Alarms and Historical Alarms?.....................................................................................290
7.2.4 How Can I Export or Import a Conguration File?............................................................................................. 290
7.2.5 How Can I Export Fault Information?...................................................................................................................... 291
7.2.6 How Can I Change the Smart Cooling Product IP Address on the WebUI?............................................... 291
7.2.7 How Can I View Version Information?.................................................................................................................... 292
A Electric Control Box Layout.............................................................................................. 293
B Layout of the Cooling System..........................................................................................296
C Base Dimensions................................................................................................................. 298
D Indoor Unit Electrical Conceptual Diagram................................................................. 300
E Acronyms and Abbreviations............................................................................................306
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1 Safety Information
1.1 General Safety
Statement
Before installing, operating, and maintaining the equipment, read this document
and observe all the safety instructions on the equipment and in this document.
The "NOTICE", "CAUTION", "WARNING", and "DANGER" statements in this
document do not cover all the safety instructions. They are only supplements to
the safety instructions. Huawei will not be liable for any consequence caused by
the violation of general safety requirements or design, production, and usage
safety standards.
Ensure that the equipment is used in environments that meet its design
specications. Otherwise, the equipment may become faulty, and the resulting
equipment malfunction, component damage, personal injuries, or property
damage are not covered under the warranty.
Follow local laws and regulations when installing, operating, or maintaining the
equipment. The safety instructions in this document are only supplements to local
laws and regulations.
Huawei will not be liable for any consequences of the following circumstances:
● Operation beyond the conditions specied in this document
● Installation or use in environments which are not specied in relevant
international or national standards
● Unauthorized modications to the product or software code or removal of the
product
● Failure to follow the operation instructions and safety precautions on the
product and in this document
● Equipment damage due to force majeure, such as earthquakes, re, and
storms
● Damage caused during transportation by the customer
● Storage conditions that do not meet the requirements specied in this
document
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General Requirements
● Do not install, use, or operate outdoor equipment and cables (including but
not limited to moving equipment, operating equipment and cables, inserting
connectors to or removing connectors from signal ports connected to outdoor
facilities, working at heights, and performing outdoor installation) in harsh
weather conditions such as lightning, rain, snow, and level 6 or stronger wind.
● Before installing, operating, or maintaining the equipment, remove any
conductive objects such as watches or metal jewelry like bracelets, bangles,
and rings to avoid electric shock.
● When installing, operating, or maintaining the equipment, wear personal
protective equipment such as insulation gloves, goggles, and safety clothing,
helmet, and shoes, as shown in the following gure.
● Follow the specied procedures for installation, operation, and maintenance.
● Before handling a conductor surface or terminal, measure the contact point
voltage and ensure that there is no risk of electric shock.
● After installing the equipment, remove idle packing materials such as cartons,
foam, plastics, and cable ties from the equipment area.
● In the case of a re, immediately leave the building or the equipment area,
and turn on the re alarm bell or make an emergency call. Do not enter the
building on re in any case.
● Do not stop using protective devices. Pay attention to the warnings, cautions,
and related precautionary measures in this document and on the equipment.
Promptly replace warning labels that have worn out.
● Keep irrelevant people away from the equipment. Only operators are allowed
to access the equipment.
● Use insulated tools or tools with insulated handles, as shown in the following
gure.
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● All cable holes should be sealed. Seal the used cable holes with restop putty.
Seal the unused cable holes with the caps delivered with the cabinet. The
following gure shows the criteria for correct sealing with restop putty.
● Do not scrawl, damage, or block any warning label on the equipment.
● When installing devices, use a torque wrench with a proper measurement
range to tighten bolts. Ensure that the wrench is not skewed and the torque
error does not exceed 10%.
● Do not work with power on during installation.
● Repaint any paint scratches caused during equipment transportation or
installation in a timely manner. Equipment with scratches cannot be exposed
to an outdoor environment for a long period of time.
● Before operations, ensure that the equipment is rmly secured to the oor or
other solid objects, such as a wall or an installation rack.
● Do not use water to clean electrical components inside or outside of a
cabinet.
● Do not change the structure or installation sequence of equipment without
permission.
● Do not touch a running fan with your ngers, components, screws, tools, or
boards before the fan is powered o or stops running.
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Personal Safety
● If there is a probability of personal injury or equipment damage during
operations on the equipment, immediately stop the operations, report the
case to the supervisor, and take feasible protective measures.
● To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits
to telecommunication network voltage (TNV) circuits.
● Do not power on the equipment before it is installed or conrmed by
professionals.
1.2 Personnel Requirements
● Personnel who plan to install or maintain Huawei equipment must receive
thorough training, understand all necessary safety precautions, and be able to
correctly perform all operations.
● Only qualied professionals or trained personnel are allowed to install,
operate, and maintain the equipment.
● Only qualied professionals are allowed to remove safety facilities and inspect
the equipment.
● Personnel who will operate the equipment, including operators, trained
personnel, and professionals, should possess the local national required
qualications in special operations such as high-voltage operations, working
at heights, and operations of special equipment.
● Professionals: personnel who are trained or experienced in equipment
operations and are clear of the sources and degree of various potential
hazards in equipment installation, operation, maintenance
● Trained personnel: personnel who are technically trained, have required
experience, are aware of possible hazards on themselves in certain operations,
and are able to take protective measures to minimize the hazards on
themselves and other people
● Operators: operation personnel who may come in contact with the
equipment, except trained personnel and professionals
● Only professionals or authorized personnel are allowed to replace the
equipment or components (including software).
1.3 Electrical Safety
Grounding
● For the equipment that needs to be grounded, install the ground cable rst
when installing the equipment and remove the ground cable last when
removing the equipment.
● Do not damage the ground conductor.
● Do not operate the equipment in the absence of a properly installed ground
conductor.
● Ensure that the equipment is connected permanently to the protective
ground. Before operating the equipment, check its electrical connection to
ensure that it is securely grounded.
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General Requirements
Use dedicated insulated tools when performing high-voltage operations.
AC and DC Power
D ANGER
Do not connect or disconnect power cables with power on. Transient contact
between the core of the power cable and the conductor will generate electric arcs
or sparks, which may cause re or personal injury.
● If a "high electricity leakage" tag is attached on the equipment, ground the
protective ground terminal on the equipment enclosure before connecting the
AC power supply; otherwise, electric shock as a result of electricity leakage
may occur.
● Before installing or removing a power cable, turn o the power switch.
● Before connecting a power cable, check that the label on the power cable is
correct.
● If the equipment has multiple inputs, disconnect all the inputs before
operating the equipment.
● A circuit breaker equipped with a residual current device (RCD) is not
recommended.
● A damaged power cable must be replaced by the manufacturer, service agent,
or professionals to avoid risks.
● High voltage operations and installation of AC-powered facilities must be
performed by qualied personnel.
Cabling
● When routing cables, ensure that a distance of at least 30 mm exists between
the cables and heat-generating components or areas. This prevents damage
to the insulation layer of the cables.
● Do not route cables behind the air intake and exhaust vents of the
equipment.
● Ensure that cables meet the VW-1 or ZB ame spread rating requirements or
higher.
● Bind cables of the same type together. When routing cables of dierent types,
ensure that they are at least 30 mm away from each other.
● If an AC input power cable is connected to the cabinet from the top, bend the
cable in a U shape outside the cabinet and then route it into the cabinet.
● When the temperature is low, violent impact or vibration may damage the
plastic cable sheathing. To ensure safety, comply with the following
requirements:
– Cables can be laid or installed only when the temperature is higher than
0°C. Handle cables with caution, especially at a low temperature.
– Cables stored at subzero temperatures must be stored at room
temperature for at least 24 hours before they are laid out.
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● Do not perform any improper operations, for example, dropping cables
directly from a vehicle.
● When selecting, connecting, and routing cables, follow local safety regulations
and rules.
ESD
NO TICE
The static electricity generated by human bodies may damage the electrostatic-
sensitive components on boards, for example, the large-scale integrated (LSI)
circuits.
● Wear ESD gloves or a well-grounded ESD wrist strap when touching the
device or handling boards or application-specic integrated circuits (ASICs).
● When holding a board, hold its edge without touching any components. Do
not touch the components with your bare hands.
● Package boards with ESD packaging materials before storing or transporting
them.
Figure 1-1 Wearing an ESD wrist strap
Neutral-Ground Voltage
It is recommended that the three-phase loads be equalized and the neutral-
ground voltage be kept at less than 2 V to meet power distribution requirements.
1.4 Installation Environment Requirements
● To prevent re due to high temperature, ensure that the ventilation vents or
heat dissipation system are not blocked when the equipment is running.
● Install the equipment in an area far away from liquids. Do not install it under
areas prone to condensation, such as under water pipes and air exhaust vents,
or areas prone to water leakage, such as air conditioner vents, ventilation
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vents, or feeder windows of the equipment room. Ensure that no liquid enters
the equipment to prevent faults or short circuits.
● If any liquid is detected inside the equipment, immediately disconnect the
power supply and contact the administrator.
● Do not expose the equipment to ammable or explosive gas or smoke. Do
not perform any operation on the equipment in such environments.
● Ensure that the equipment room provides good heat insulation, and the walls
and oor are dampproof.
● Install a rat guard at the door of the equipment room.
Installation at Heights
● Working at heights refers to operations that are performed at least 2 meters
above the ground.
● Do not work at heights if the steel pipes are wet or other potential danger
exists. After the preceding conditions no longer exist, the safety director and
relevant technical personnel need to check the involved equipment. Operators
can begin working only after obtaining consent.
● When working at heights, comply with local relevant laws and regulations.
● Only trained and qualied personnel are allowed to work at heights.
● Before working at heights, check the climbing tools and safety gears such as
safety helmets, safety belts, ladders, springboards, scaolding, and lifting
equipment. If they do not meet the requirements, take corrective measures or
disallow working at heights.
● Wear personal protective equipment such as the safety helmet and safety belt
or waist rope and fasten it to a solid structure. Do not mount it on an
insecure moveable object or metal object with sharp edges. Make sure that
the hooks will not slide o.
● Set a restricted area and eye-catching signs for working at heights to warn
away irrelevant personnel.
● Carry the operation machinery and tools properly to prevent them from
falling o and causing injuries.
● Personnel involving working at heights are not allowed to throw objects from
the height to the ground, or vice versa. Objects should be transported by
tough slings, hanging baskets, highline trolleys, or cranes.
● Ensure that guard rails and warning signs are set at the edges and openings
of the area involving working at heights to prevent falls.
● Do not pile up scaolding, springboards, or other sundries on the ground
under the area involving working at heights. Do not allow people to stay or
pass under the area involving working at heights.
● Inspect the scaolding, springboards, and workbenches used for working at
heights in advance to ensure that their structures are solid and not
overloaded.
● Any violations must be promptly pointed out by the site manager or safety
supervisor and the involved personnel should be prompted for correction.
Personnel who fail to stop violations will be forbidden from working.
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1.5 Mechanical Safety
Hoisting Devices
● Do not walk under hoisted objects.
● Only trained and qualied personnel should perform hoisting operations.
● Check that hoisting tools are available and in good condition.
● Before hoisting objects, ensure that hoisting tools are rmly secured onto a
load-bearing object or wall.
● Ensure that the angle formed by two hoisting cables is no more than 90
degrees, as shown in the following gure.
● Do not drag steel ropes and hoisting tools or bump hoisted objects against
hard objects during hoisting.
Using Ladders
● Use wooden or berglass ladders when you need to perform live working at
heights.
● When a step ladder is used, ensure that the pull ropes are secured and the
ladder is held rm.
● Before using a ladder, check that it is intact and conrm its load bearing
capacity. Do not overload it.
● Ensure that the ladder is securely positioned. The recommended angle for a
ladder against the oor is 75 degrees, as shown in the following gure. An
angle rule can be used to measure the angle. Ensure that the wider end of the
ladder is at the bottom, or protective measures have been taken at the
bottom to prevent the ladder from sliding.
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● When climbing a ladder, take the following precautions to reduce risks and
ensure safety:
– Keep your body steady.
– Do not climb higher than the fourth rung of the ladder from the top.
– Ensure that your body's center of gravity does not shift outside the legs
of the ladder.
Drilling Holes
When drilling holes into a wall or oor, observe the following safety precautions:
NO TICE
Do not drill holes into the equipment. Doing so may aect the electromagnetic
shielding of the equipment and damage components or cables inside. Metal
shavings from drilling may short-circuit boards inside the equipment.
● Obtain the consent from the customer and subcontractor before drilling.
● Wear goggles and protective gloves when drilling holes.
● When drilling holes, protect the equipment from shavings. After drilling, clean
up any shavings that have accumulated inside or outside the equipment.
Moving Heavy Objects
D ANGER
When removing a heavy or unstable component from a cabinet, be aware of
unstable or heavy objects on the cabinet.
● Be cautious to avoid injury when moving heavy objects.
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● When moving the equipment by hand, wear protective gloves to prevent
injuries.
● Move or lift the equipment by holding its handles or lower edges. Do not hold
the handles of modules (such as power supply units, fans, and boards) that
are installed in the equipment because they cannot support the weight of the
equipment.
● Avoid scratching the cabinet surface or damaging cabinet components and
cables during equipment transportation.
● When transporting the equipment using a forklift truck, ensure that the forks
are properly positioned to ensure that the equipment does not topple. Before
moving the equipment, secure it to the forklift truck using ropes. When
moving the equipment, assign dedicated personnel to take care of it.
● Choose railways, sea, or a road with good condition for transportation to
ensure equipment safety. Avoid tilt or jolt during transportation.
● Move a cabinet with caution. Any bumping or falling may damage the
equipment.
1.6 Cooling System Safety
Welding
● At least two persons are required on a welding site.
● A welder must have a work permit.
● A welding site must be free from inammables.
● Ensure that a re extinguisher, wet wiper, and water container are available.
● A burning welding torch must not be placed on a component or on the oor,
and must not be placed in a metal container with acetylene and oxygen.
Otherwise, the gas may leak and cause a re.
● High-temperature pipes after welding must be promptly cooled.
● Do not weld or cut on pressurized containers or pipes. Electric devices must be
powered o before welding.
High Temperature and Pressure
● When maintaining or replacing components, pay attention to high-
temperature components (such as the compressor, refrigerant pipe, and
electric heater) to prevent scalds.
● When maintaining or replacing components, pay attention to high-pressure
components (such as the compressor and refrigerant pipe) to prevent the
refrigerant system from being cracked or exploded due to misoperations.
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