Related Manuals for Huawei NetCol5000-A020
Summary of Contents for Huawei NetCol5000-A020
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Page 1: User Manual
Part Number: 31010QPN NetCol5000-A020 Air Cooled In-row Precision Air Conditioner V100R002 User Manual Issue Date 2014-06-30 HUAWEI TECHNOLOGIES CO., LTD. - Page 2 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 specified in the contract, all statements, information, and recommendations in this document are provided "AS IS"...
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Page 3: About This Document
About This Document Purpose This document describes the NetCol5000-A020, an air cooled in-row precision air conditioner, in terms of its precautions, product description, installation guide, commissioning, operation and maintenance (O&M). It helps users rapidly learn the operation and maintenance (O&M) of the NetCol5000-A020. - Page 4 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual About This Document After the system is restarted, use the kmtune Symbol command to check the kernel parameters to ensure that the setting is valid. Indicates a potentially hazardous situation which, if not avoided, could result in equipment damage, data loss, performance deterioration, or unanticipated results.
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Page 5: Table Of Contents
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual Contents Contents About This Document ........................ii 1 Precautions ............................. 1 1.1 Safety Precautions ................................ 1 1.2 Electrical Safety ................................2 1.3 Mechanical Safety ................................ 4 1.4 Running Safety ................................5 1.5 Others.................................... - Page 6 5.3 Other Cooling System Components..........................76 5.4 Alarm Reference ................................. 78 5.5 Troubleshooting ................................90 5.5.1 The NetCol5000-A020 Generates Abnormal Voice ....................90 5.5.2 A Compressor does not Work ........................... 91 5.5.3 Compressor Generates Excessive Noises ........................ 92 5.5.4 An Indoor Fan Fails to Start ............................. 93 5.5.5 Humidification Fails ..............................
- Page 7 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual Contents 5.6.6 Replacing the Solenoid Coil ..........................112 5.6.6.1 Replacing the Solenoid Coil on the Liquid Solenoid Valve ................113 5.6.6.2 Replacing the Solenoid Coil on the Hot Gas Bypass Valve ................114 5.6.7 Replacing Components in the Electric Control Box ....................
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Page 8: Precautions
Only trained and qualified personnel are allowed to install, operate, and maintain Huawei equipment. Only personnel certified or authorized by Huawei are allowed to replace or change the equipment or components (including software). Issue 01 (2014-06-30) Huawei Proprietary and Confidential... -
Page 9: Electrical Safety
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 1 Precautions Any fault or error that might cause safety problems must be reported immediately to a supervisor. Grounding Requirements Equipment to be grounded must meet the following requirements: ... - Page 10 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 1 Precautions The high voltage power supply provides power for the device operation. Direct or indirect contact (through damp objects) with high voltage and alternating current (AC) mains supply may result in fatal danger.
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Page 11: Mechanical Safety
In addition, if the scraps caused by drilling enter the cabinet, the printed circuit boards (PCBs) may be short circuited. Drill holes with approval of the customer, contractor, and Huawei. Before drilling holes on the rack, first remove the cables inside the rack. -
Page 12: Running Safety
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 1 Precautions When moving or lifting the chassis, well protect the chassis to avoid scratches or crashes. When moving the chassis, do not use a part to support the body. Otherwise, the part may be damaged. - Page 13 They can take this product for environmental safe recycling. Lost the manual If you lost this manual, please contact Huawei technical support to get the electronic document or download it from http://support.huawei.com. Issue 01 (2014-06-30) Huawei Proprietary and Confidential Copyright ©...
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Page 14: Product Description
2.2 Composition of an Indoor Unit Structure The NetCol5000-A020 is in dimensions (H x W x D) of 2000 mm x 300 mm x 1000 mm in standard configurations, and 2000 mm x 300 mm x 1200 mm for expansion by adding frames. - Page 15 2 Product Description Figure 2-2 Structure dimensions (unit: mm) Composition The NetCol5000-A020 consists of a cabinet, a compressor, EC fans, an evaporator, air filters, expansion valves, a surge protection and filtering board, an electric heater (optional), and an electrode humidifier (optional).
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Page 16: Monitoring Function
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 2 Product Description Check valve Check valve are deployed on discharge pipes, preventing return of refrigerant at high temperature, reducing pipe vibration. Liquid solenoid valve Liquid solenoid valves are opened and closed to ensure smooth liquid circulation and prevent refrigerant migration or even liquid strike. -
Page 17: Monitoring System
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 2 Product Description Figure 2-3 Appearance (1) Indicator (2) LCD Functions If only one air conditioner is used, the controller provides logic control of components in the air conditioner to meet temperature and humidity requirements. -
Page 18: Application Environment
0–1000 m, when the altitude is greater than 1000 m, the cooling Altitude performance is derated. Protection level Indoor unit: IP20 Outdoor unit: IPX5 a: For the detailed derated data, contact Huawei. Issue 01 (2014-06-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. - Page 19 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 2 Product Description Table 2-2 Physical ports Item Specifications Copper pipe, with an outer diameter of 0.5 inches and thickness Refrigerant liquid pipe of 0.75 mm, withstanding a pressure not smaller than 4.5 MPa, welding.
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Page 20: Technical Specifications
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 2 Product Description Item Specifications single-phase DC pulse and transient current pulse. Note: If some conditions are not met, please contact Huawei technical support. Table 2-4 Water quality requirements Item Requirement Unit Hydrogen ion 7–8.5 μS/cm... - Page 21 When the total load of servers is less than 30% load of a single air conditioner, the humidity might be relatively high. In this case, contact Huawei technical support. Table 2-6 Optional parameters Item Specifications...
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Page 22: Installation Guide
To ensure the optimal operating condition and longest service life, install the NetCol5000-A020 correctly as required. 3.1.1 Preparing Tools Table 3-1 Table 3-5 list the tools for installing the NetCol5000-A020. Add or delete tools as required. Table 3-1 General tools Appearance, Specifications, and Name Adjustable wrench... - Page 23 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Table 3-2 Transportation and unpacking tools Appearance, Specifications, and Name Hanging rope Lever (bearing Pallet Jack Diesel pallet truck (bearing weight weight equal to or equal to or larger...
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Page 24: Material Preparations
Ensure that the charging hoses match with the 1/4 inch needle valves used in the system and configure connectors if required. 3.1.2 Material Preparations Configuration Materials are classified to Huawei-provided, self-purchased, and onsite prepared materials as follows. Issue 01 (2014-06-30) Huawei Proprietary and Confidential... - Page 25 Optional: materials that can be purchased from Huawei or by yourself. Unconfigured: materials that are not provided by Huawei and need to be prepared by the customer. Oil Trap and Inverted Trap Preparations The working pressure for copper pipes, oil trap, inverted trap and other pipes must be higher than 4.6 MPa.
- Page 26 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Outer diameter Name Configuration Specifications and thickness of copper pipes (mm) trap copper pipes is 16.0 mm. Liquid Optional 12.7 mm x 0.75 mm The inner diameter of pipe copper lines is 13.0 mm.
- Page 27 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-2 Water inlet pipe and connector for a humidifier (1) Inner thread connector: BSPP, (2) Connector for rigid pipes: BSPT, 3/4 inch, outer 3/4 inch thread connector...
- Page 28 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-3 Routing drainpipes (1) Copper pipe with an outer (2) Hose clamp diameter of 3/4 inch (3) Hose with an inner diameter of 3/4 (4) Connector for rigid pipes, 3/4 inch copper...
- Page 29 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Height of the U-shaped clamp H = Pipe diameter (with thermal insulation foam) – 5 mm. The pipe support is not configured by default. Cable Specifications Table 3-7 lists specifications of power cables and cables to the host.
- Page 30 A support is optional for the air conditioner. You can configure a support in the following two ways: Prepare the support according to the drawings obtained from Huawei. Specify the support as a mandatory item for the air conditioner in the contract.
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Page 31: Installation Precautions
Please note that to control the welding process and avoid excessive error. Adjust the height of the support according to the actual situation. 3.1.3 Installation Precautions Before installing the NetCol5000-A020, read this section carefully and perform installation by strictly following the guidance in this section. Precautions ... - Page 32 During the NetCol5000-A020 operation, all doors and windows of the shelter or equipment room should be closed to reduce the additional load of the NetCol5000-A020. Routing Refrigerant Pipes Pipe length mentioned in this document is equivalent.
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Page 33: Installation Layout
For details about the currents in full load, see the NetCol5000-A020 nameplate. Only trained and qualified personnel are allowed to connect cables. Installation personnel must take protective measures, for example, wearing protective gloves. - Page 34 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-7 Horizontal installation layouts of outdoor units (1) Tilted gas pipeline (2) Inverted trap (3) Oil trap (4) Tilted liquid pipe Issue 01 (2014-06-30) Huawei Proprietary and Confidential...
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Page 35: Transportation And Unpacking
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-8 Vertical installation layouts of outdoor units (1) Tilted gas pipeline (2) Inverted trap (3) Oil trap (4) Tilted liquid pipe The specifications for oil trap inverted trap can be prepared by referring to... - Page 36 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Only trained personnel are allowed to move the cabinet. Use a pallet truck to transport the cabinet secured to a wooden support to the installation position. Insert the forks of the pallet truck in the middle position to ensure balance.
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Page 37: Installation Flowchart
Visually inspect the cabinet appearance for shipping damage. If it is damaged, notify the carrier immediately. Step 3 Check that the fittings comply with the packing list. If some fittings are missing or do not comply with the packing list, record the information and contact your local Huawei immediately. ----End 3.3 Installation Flowchart... -
Page 38: Mechanical Installation
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-11 Installation flowchart 3.4 Mechanical Installation Context Figure 3-12 shows the mechanical installation process. Issue 01 (2014-06-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. - Page 39 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-12 Mechanical installation flowchart Issue 01 (2014-06-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
- Page 40 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide When removing the front door, pay attention to the cables between the control panel and the cabinet to avoid damage. Take care to prevent the device from falling over when removing the device.
- Page 41 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-14 Removing a side panel Step 5 Removing transportation fasteners. Figure 3-15 shows how to remove the sheet metals for fastening the cabinet. Figure 3-15 Removing the sheet metals for fastening the cabinet during transportation...
- Page 42 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Loosen the two bottom bolts for fastening the compressor using the 13# fixed wrench, pull out the sheet metal, and fasten the bolts using a wrench with a torque of 15 N•m as...
- Page 43 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-17 Holes on the bottom panel and top panel (unit: mm) (1) Hole for routing drainpipes (2) Hole for routing cables in the bottom (3) Hole for routing cables in the bottom...
- Page 44 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Remove the screws from the fixing plate, as shown in Figure 3-18. Figure 3-18 Removing the screws from the fixing plate Install side panels. At least four persons are required to lift the equipment from the pallet to the ground.
- Page 45 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Fix enclosure frames onto the front door frame using twenty two M6 screws, as shown in Figure 3-20. Figure 3-20 Installing an enclosure frame Install the front door onto the enclosure frame, and connect the bottom ground cable of the front door to the enclosure frame.
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Page 46: Install The Outdoor Unit
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-21 Secure the air conditioner to the support Step 10 Loosen the screws on the rear door column, secure the combining parts to the door by using bolts. -
Page 47: Connecting Pipelines
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-22 Location of needle valves (1) Liquid pipe needle (2) Low-pressure needle (3) High-pressure needle valve valve valve Procedure Step 1 Remove the valve bonnet, and exhaust the nitrogen slowly. -
Page 48: Routing Refrigerant Pipes
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide The thickness of the thermal insulation foam for refrigerating and water cooling pipelines should be at least 13 mm. Ensure that the water pipelines with thermal insulation foam can pass through holes the on bottom plate. - Page 49 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-23 Welding refrigerant pipes (1) Discharge pipe (2) Suction pipe During the welding process, charge a little nitrogen into the pipes to avoid impurity caused by internal oxidation, as shown in Figure 3-24.
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Page 50: Connecting Water Pipes
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Step 3 Install refrigerant pipes by referring to operations in Figure 3-25. When the direction of the refrigerant pipe is changed, add a support at the position that is 1000 mm away from the changing point. -
Page 51: Leak Checking
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Procedure Step 1 Connect humidifier water supply by referring to Figure 3-2, and seal thread connection points using waterproof sealant. Cut off cable ties on the water inlet hoses to the humidifier using diagonal pliers, pull the connectors of the pipes to the bottom of the equipment, and install the rigid pipes and their connectors. -
Page 52: Electrical Connection
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Step 3 If any welding problem occurs, find the leakage and weld it again. If pressure retainability meets requirements, reclaim nitrogen from the needle valves. ----End 3.8 Electrical Connection 3.8.1 Cable Installation... -
Page 53: Connecting Power Cables
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Port layout Figure 3-27 Port layout on the electrical control box (1) J73 for teamwork networking (2) X106 signal terminals for connecting to the and host monitoring (J73) -
Page 54: Installing The Voltage Jumper
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-28 Routing power cables ----End 3.8.3 Installing the Voltage Jumper Before installing the voltage jumper, verify that the voltage jumper matches the mains line voltage. Connect the voltage jumper to the JMP terminal of the electrical control box as shown by 4 in Figure 3-27. -
Page 55: Connecting The Signal Cables
Before connecting signal cables to an indoor unit, take effective ESD protection measures. You can obtain the signal cables from Huawei or purchase them by yourself. Before connecting the cables, ensure that choosing cables routing mode, top or bottom. - Page 56 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-30 Zoomed-in view of the control terminal X106 port Table 3-10 describes the definitions and functions of control ports. Table 3-10 Definitions and functions of control ports...
- Page 57 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Dry Contact Terminal Definition Function Feature and controls the shutdown of the indoor only, and the indoor unit. Terminals 07 and usage range is within 08 are disconnected before 100 meters.
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Page 58: Connecting Outdoor Unit On/Off Signal Cable
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-31 Routing signal cables for outdoor unit On/Off signal and water sensor 3.8.4.2 Connecting Outdoor Unit On/Off Signal Cable Procedure Step 1 Route the signal cables through the cable protecting ring on the top or at the bottom of the cabinet and the upper or lower cable hole on one side of the electrical control box. -
Page 59: Connecting A Water Sensor
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide 3.8.4.3 Connecting a Water Sensor Context Place the water sensor with the sheet metal upwards and detection board downwards. Procedure Step 1 Connect one end of the signal cables to a water sensor. - Page 60 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-32 DIP switch position (1) Teamwork communications ports J73UP and (2) DIP switches on the main J73DOWN control board (3) J127 FE port (reserved) Procedure Step 1 Connect the networked air conditioner, as shown in Figure 3-33.
- Page 61 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-33 Network diagram for teamwork communication and monitoring The number of air conditioners in the preceding figure is less than or equal to 32. Com1 port is J73UP port, Com2 port is J73DOWM port.
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Page 62: Installing T/H Sensors
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Switch Default Value Description Remaining in ON. ----End 3.8.6 Installing T/H Sensors To install the T/H sensors, you need to connect cables to the sensors and set DIP switches for the sensor. - Page 63 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Figure 3-35 Cables routed outside the cabinet (1) Cold aisle side (2) Hot aisle side The T/H sensor should be placed at a place 1.5 m to the ground, and fixed securely using cable ties.
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Page 64: Connections Verification
Hot aisle T/H 2 Hot aisle T/H 3 By default, the address of an T/H sensor provided by Huawei is 1. No DIP switch operation is required for the last RS485_R port. After setting communications addresses for T/H sensors, choose Settings > System Settings > T/H Sensor from the main menu and enable the T/H sensor in the aisle. - Page 65 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Check Item Expected Result Check Result Remark connected to its base. □ Passed □ Failed Compressor The sheet metals and lifting bolts for transporting the compressors are removed.
- Page 66 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 3 Installation Guide Table 3-15 Check items on the electric Expected Result Check Result Remark □ Passed □ Failed The input voltage is within the range of the rated voltage displayed on the voltage jumper (tolerance ±...
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Page 67: Power-On Commissioning
Conditioner User Manual 4 Power-On Commissioning Power-On Commissioning 4.1 Tools Tools for commissioning the NetCol5000-A020 are as follows: Wrench: adjustable wrench. Vacuumization and charging tools: pressure gauge (scale > 4.0 MPa), pipe (bearing pressure > 4.0 MPa), and vacuum pump. -
Page 68: Charging Refrigerant Oil
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Table 4-2 shows the amount of extra refrigerant to be charged when connecting to NetCol500-A0324C11E0 T1 outdoor unit. Table 4-2 Refrigerant configuration principle 2 Pipe length L Gas pipe diameter... - Page 69 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Context Ensure that the hose connectors are fastened before vacuumizing the cooling system. Procedure Step 1 Connect the refrigerant oil bucket to the low-pressure needle valve and connect the vacuum...
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Page 70: Vacuumizing
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning 4.2.3 Vacuumizing Procedure Step 1 Connect pressure gauges to the high-pressure needle valve, low-pressure needle valve, and vacuum pump, as shown in Figure 4-2, and start vacuumizing from the two positions. -
Page 71: Partially Charging In Refrigerant
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Step 4 Check that the time for vacuumizing is 80 minutes or longer after making sure that the cooling system does not leak, the pressure displayed on the vacuum pump is less than or equal to 60 Pa (absolute pressure), and the sight glass is dry (green). -
Page 72: Power-On Preparations
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Never move the hose or steel vessel during refrigerant charging. Otherwise, the value on the electronic balance is influenced. Step 5 Refrigerant should be charged in liquid based on the calculated amount. - Page 73 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Figure 4-3 Removing cables from the compressor Procedure Step 1 Check that the water inlet pipes and drainpipes of the humidifier are properly connected and outer thermal insulation foam is reliably fixed.
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Page 74: Powering On The Equipment
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning 4.4 Powering on the Equipment Context Figure 4-4 shows positions of various circuit breakers, which are necessary for system commissioning. Figure 4-4 Switch position (1) Main circuit breaker QF1... -
Page 75: Commissioning Procedure
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Step 2 Choose Basic Settings on the main menu of the LCD and set following parameters by referring to Advanced Cooling Controller User Manual. Select the language: English or Chinese. - Page 76 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Saturation Pressure Saturation Pressure Saturation Pressure Temperatu (kPa) Temperatu (kPa) Temperatu (kPa) re (° C) re (° C) re (° C) 988.4 2044.9 3041.7 1020.9 2098.9 3114.0 1054.1 2154.0...
- Page 77 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning Step 6 Tap Off of the liquid solenoid valve in Diagnostic mode and reset the liquid solenoid valve. Step 7 Tap On of the hot gas bypass valve in Diagnostic mode.
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Page 78: Powering Off The Equipment
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 4 Power-On Commissioning 4.6 Powering off the Equipment Procedure Step 1 On the main menu, tap Shutdown. Exercise cautions when performing operations on the equipment because the equipment is under power. -
Page 79: System Operation And Maintenance
Items. Please strictly follow the instructions of each piece of equipment maintenance period. Otherwise, Huawei does not take responsibilities for the damage to the equipment. 5.2 Indoor Unit Maintenance Items This section describes scheduled maintenance items of an indoor unit. Maintenance results shall be recorded in a table after each maintenance item is completed. -
Page 80: Troubleshooting
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Item Operations Troubleshooting Result Check that the indoor fan Replace the fan by referring to blades are intact. 5.6.2 Replacing an Indoor Fan. Check that the indoor fans... - Page 81 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Item Operations Troubleshooting Result insulation foams on the foams. steam pipes are not damaged. Check that solenoid Replace the solenoid valves. valves of the water inlet...
- Page 82 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Item Operations Troubleshooting Result and float condensate water pan and matter from the floats. float. Table 5-3 Semiannual maintenance items Item Operations Troubleshooting Result Components Check that all circuit...
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Page 83: Other Cooling System Components
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Item Operations Troubleshooting Result within the normal range (24 V AC± 10%). Cables Check that the power Replace cables if necessary. cables and the cables connecting the indoor unit and outdoor unit are not aging. -
Page 84: Thermostatic Expansion Valve
It is not recommended that you adjust the thermostatic expansion valve onsite because it has been adjusted before delivery. If the superheat degree is too low or high, adjust the thermostatic expansion value as follows at your deliberation or after consulting Huawei technical support: Unscrew the valve bonnet at the bottom. -
Page 85: Alarm Reference
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance 5.4 Alarm Reference Table 5-4 describes alarms for the air cooled in-row precision air conditioner NetCol5000-A020. Table 5-4 Alarm reference Alarm Alarm Alarm Impact Possible Causes... - Page 86 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity temperature. 3. The ambient temperature is lower than the lower alarm threshold. 1. The T/H sensor at return 1.
- Page 87 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity compressor is faulty. switch. shuts down 3. The solenoid valve is 3. Maintain or replace forcibly. faulty.
- Page 88 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity generated. shutdown period for the shortest shutdown compressor are period for the inappropriately set. compressor. 2. This alarm is affected by 2.
- Page 89 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity exceed the air filters exceeds the air filters. For details runtime generated. alarm threshold. about how to replace the air filters, see 5.6.1...
- Page 90 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity overfreq unstable. 2. Replace the surge generated, protection and voltage 2. The surge protection and and the test board.
- Page 91 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity system damaged. 2. Check cables to the shuts down. smoke sensor. 3. The smoke sensor is faulty.
- Page 92 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity load is high. 5. The ambient temperature is higher than the upper alarm threshold. 1. The supply air low 1.
- Page 93 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity capacity of the temperature. NetCol5000-A020 is insufficient or the heat load is high. 4. The ambient temperature is higher than the upper alarm threshold.
- Page 94 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity abnormal generated, 2. Cables to the float are obstacles. and the loose or damaged. 2. Check cables to the system 3.
- Page 95 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity system disconnected. circuit C. shuts down. 1. A device on circuit D is 1. Maintain or replace...
- Page 96 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Alarm Alarm Alarm Impact Possible Causes Solution Name Severity main control board. 2. Clean the temperature and humidity 2. Dirt or water exists collection board in the around the board, which cold aisle.
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Page 97: Troubleshooting
5.5 Troubleshooting Certain circuits in the NetCol5000-A020 have lethal voltage. Only professional technicians are allowed to perform maintenance. Exercise caution during live-line troubleshooting. If jumpers are used for troubleshooting, remove them after troubleshooting. Connected jumpers may affect control functions and damage equipment. -
Page 98: A Compressor Does Not Work
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance If yes, tighten the bolts and check whether the fault is rectified. − If yes, troubleshooting is complete. − If no, go to Step ... -
Page 99: Compressor Generates Excessive Noises
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Step 2 Check for any startup requirement for compressor on the LCD. If no, the compressor does not need to start. It is not faulty, and troubleshooting is complete. -
Page 100: An Indoor Fan Fails To Start
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Step 2 Check whether the compressor starts and stops continuously or the compressors has a dull noise. If the compressor starts and stops continuously, deal with it by referring to Comp HP switch, and then check whether the fault is rectified. - Page 101 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Unplug the faulty fan terminal, use multimeter to measure terminals between 0 V and 48 V terminals are about 48 V. If the voltage difference is too large, power supply is abnormal, Figure 5-1 shows the measurement method.
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Page 102: Humidification Fails
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-2 Fan fuse position (1) Fan The fuses from top to bottom are FU9 to FU16, corresponding to fan 1 to fan 8 fuse After treatment, check whether the fault is rectified. If yes, troubleshooting is complete. -
Page 103: The Heating Function Is Unavailable
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance − If no, go to Step If there are no alarms, go to Step Step 2 Check for any startup requirement for humidifier on the LCD. - Page 104 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Procedure Step 1 Check whether there are electric heater alarms. If yes, deal with it by referring to 5.4 Alarm Reference and then check whether the fault is rectified.
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Page 105: The Water Overflows The Netcol5000-A020
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance 5.5.7 The Water Overflows the NetCol5000-A020 Possible Causes Drainpipes are not properly connected. The float is faulty. The inlet pipe and drainpipe leak. -
Page 106: The Lcd Does Not Light
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance DIP switches of the T/H sensor are incorrectly set. The T/H sensor is faulty. Procedure Step 1 Tap Settings > System Settings > T/H Sensor to check whether the T/H sensor is enabled on the controller. -
Page 107: Parts Replacement
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Procedure Step 1 Open the electric control box, check whether the main control board circuit breaker QF5 is switched on. If not switched on, switch on QF5 and check whether the fault is rectified. - Page 108 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Procedure Step 1 Tap Shutdown on the main menu, switch off the front end circuit breaker. Exercise cautions when performing operations on the equipment because the equipment is under power.
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Page 109: Replacing An Indoor Fan
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance 5.6.2 Replacing an Indoor Fan Prerequisites Recommended tools: protective gloves, a Phillips screw driver, diagonal pliers, cable ties, a torch. The indoor fan needs to be replaced. -
Page 110: Replacing The Compressor
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-4 Removing bolts fastening the fan Step 6 Install a new fan, properly connect cables to connectors, and fix cables using cable ties. Step 7 Install and lock the front door, and properly connect control cables and ground cables. - Page 111 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Reclaim or dispose the refrigerant in accordance with local laws and regulations. Do not discharge the refrigerant to the atmosphere. When replacing a compressor, avoid skin contact with the refrigerant or lubricant to prevent frostbite or burns.
- Page 112 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Step 4 Remove the compressor. Figure 5-6 Removing the compressor Heat thread connecting points of angle valves on the suction pipes using a heat gun, wait for about 10 minutes.
- Page 113 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance During the welding process, do not expose the refrigerant pipes for over 15 minutes. Otherwise, system reliability may deteriorate. Step 8 Replace seal rings inside the angle valves.
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Page 114: Replacing The Humidifier Cylinder
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance 5.6.4 Replacing the Humidifier Cylinder Prerequisites Recommended tools: a Phillips screwdriver, an inner hexagon wretch. The humidifier cylinder needs to be replaced. A spare and functional humidifier cylinder is available. - Page 115 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-7 Replacing the humidifier cylinder Step 4 Remove cables to the electrode and high water level sensor above the humidifier cylinder. Step 5 Untie the bind strap on the humidifier cylinder and remove the humidifier cylinder, as shown...
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Page 116: Electric Heater
When removing the electric heaters, avoid dead bends on the capillary tube of the temperature switch. The electric heater rack is inside the NetCol5000-A020. Exercise caution during maintenance to prevent internal components from scratches or damage Procedure Step 1 Tap Shutdown on the main menu, switch off the main circuit breaker QF1 and the front end circuit breaker. - Page 117 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-8 Removing fan supports Step 4 Cut off cable ties fixing cables on the right column and remove waterproof connectors from the upper air inlet temperature sensor.
- Page 118 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-9 Removing the electric heater support Step 8 Remove only the four screws fixing the electric heater, and take down the electric heater without removing the sensing bulb, as shown in Figure 5-10.
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Page 119: Replacing The Solenoid Coil
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Step 9 Install the new electric heater, heater support, and fans in an inverse order. When installing the electric heater, fix the terminals on both sides of the electric heater using waterproof adhesive. -
Page 120: Replacing The Solenoid Coil On The Liquid Solenoid Valve
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-11 Location of solenoid coils (1) Solenoid coil on the liquid solenoid (2) Solenoid coil on the hot gas bypass valve valve 5.6.6.1 Replacing the Solenoid Coil on the Liquid Solenoid Valve... -
Page 121: Replacing The Solenoid Coil On The Hot Gas Bypass Valve
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance 5.6.6.2 Replacing the Solenoid Coil on the Hot Gas Bypass Valve Procedure Step 1 Tap Shutdown on the main menu, switch off the main circuit breaker QF1 and the front end circuit breaker. - Page 122 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Exercise cautions when performing operations on the equipment because the equipment is under power. Remove the rear door and the air filters when switch off the main circuit breaker QF1.
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Page 123: Replacing The Return Air And Supply Air Temperature Sensor
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Step 8 Check whether cables are connected properly by referring to D Electrical Schematic Diagram E Schematic Diagram of the Main Control Board. Step 9 Power on the equipment and check whether the equipment runs properly. - Page 124 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-13 Probe position of the return air temperature sensor Figure 5-14 Probe position of the supply air temperature sensor Issue 01 (2014-06-30) Huawei Proprietary and Confidential...
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Page 125: Replacing An T/H Sensor
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Procedure Step 1 Tap Shutdown on the main menu, switch off the main circuit breaker QF1 and the front end circuit breaker. Exercise cautions when performing operations on the equipment because the equipment is under power. -
Page 126: Replacing The Power Module
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Exercise cautions when performing operations on the equipment because the equipment is under power. Remove the rear door and the air filters when switch off the main circuit breaker QF1. - Page 127 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Procedure Step 1 Tap Shutdown on the main menu, switch off the main circuit breaker QF1 and the front end circuit breaker. Exercise cautions when performing operations on the equipment because the equipment is under power.
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Page 128: Replacing The Float
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance 5.6.11 Replacing the Float Prerequisites The float needs to be replaced. A spare and functional float is available. Context The front door is opened for front-access maintenance. -
Page 129: Replacing The Lcd
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Figure 5-17 Replacing the float Step 5 Replace the float and connect the connectors. Step 6 Install and fasten the screw to fix the float and ensure that the float is horizontal. - Page 130 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual 5 System Operation and Maintenance Exercise cautions when performing operations on the equipment because the equipment is under power. Remove the rear door and the air filters when switch off the main circuit breaker QF1.
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Page 131: A Acronyms And Abbreviations
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual A Acronyms and Abbreviations Acronyms and Abbreviations Advanced cooling controller Computational fluid dynamics Controller area network Direct current Electronic commutation Positive temperature coefficient Residual current circuit breaker RCCB Thin film transistor... -
Page 132: B Laying Out The Cooling System
Huawei does not provide the inverted traps (component 5) and oil traps (component 3). However, to ensure the normal operating and easy maintenance of the cooling system, it is recommended that you use these two components. -
Page 133: C Electrical Ports
NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual C Electrical Ports Electrical Ports Figure C-1 Components and external ports of the electrical control box (1) Main control board (2) Circuit breakers from left to right: main circuit breaker QF1, electric heater circuit... - Page 134 NetCol5000-A020 Air Cooled In-row Precision Air Conditioner User Manual C Electrical Ports (5) X102 signal terminals for 1-4 fan (6) X103 signal terminals for 5-8 fan (7) X104 signal terminals for solenoid valve (8) X101 signal terminals for humidifier and floats...