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Huawei V100R001C50 User Manual

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Advanced Cooling Controller
V100R001C50
User Manual
Issue
Draft A
Date
2014-12-26
HUAWEI TECHNOLOGIES CO., LTD.

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Summary of Contents for Huawei V100R001C50

  • Page 1 Advanced Cooling Controller V100R001C50 User Manual Issue Draft A Date 2014-12-26 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"...

  • Page 3: About This Document

    Certain manufacturing and assembly commands for project implementation and error locating may cause device exceptions or service interruptions if they are misused. These commands are not provided in this document. If you need these commands, contact Huawei technical support. ...
  • Page 4 Changes between document issues are cumulative. The latest document issue contains all the changes made in earlier issues. Issue Draft A (2014-12-26) This issue is used for first office application (FOA). Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 5: Table Of Contents

    4.1.1 Querying Temperature and Humidity Curves ......................31 4.1.2 Querying Alarms ..............................32 4.1.3 Querying Logs ................................. 34 4.1.4 Querying Device Runtime ............................34 4.1.5 Querying Component Status ............................ 35 Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 6 5.12 Rectifying Faults of the E-label Identification Board ....................55 5.13 Importing a Certificate and Key ..........................57 A Parameter Description....................... 59 B Acronyms and Abbreviations ....................79 Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 7: Acc Introduction

    (1) Indicator (2) LCD Table 1-1 Indicator and buzzer status description Alarm Status Indicators Buzzer The device is operating Green Silent properly, or a warning alarm occurs. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 8: Controller Ports

    The first toggle switch DIP status is ON, and the second, third, fourth toggle switch DIP status are non 1.3 Operating Environment Parameter Table 1-2 describes the operating environment parameters for the ACC. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 9 Storage temperature Relative humidity 0%–95% RH (non-condensing) Altitude 0–2000 m; working temperature decreased by 1° C when the altitude increases for every 200 m, maximum 4000 m Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 10: Screen Functions

    USB status in the status bar indicates that the USB flash drive is successfully connected to the display panel. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 11: Menu Hierarchy

    Admin, Engineer, or Operator, and can tap the icon to log out. 2.2 Menu Hierarchy Figure 2-2 shows the hierarchy of the controller menu. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 12  About Checks the model, manufacturer, monitoring version, detail version information, and electronic label of the ACC. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 13: Power-On Commissioning

    For non-initial power-on, the LCD automatically enters the home screen as shown in Figure 2-1. Procedure Step 1 Set the language and tap Next, as shown by (1) in Figure 3-1. Figure 3-1 Quick settings Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 14: Initial Configuration

    5.3 How to Change a Password. If the login password is forgotten, refer to 5.4 How to Restore the Initial Password to restore the initial password. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 15: Start And Shutdown

    A Guest user can only be used for querying information. Log in as other types of users if attempting to set parameters or perform maintenance. Determine the parameter modification for the Admin or Engineer user with Huawei. Huawei will not be liable for any consequence caused by modification without permission.

  • Page 16: Setting The Temperature

    ACC will control the temperature around the precision air return air vent of the precision air conditioner to conditioner 24° C. performs the cooling or heating based on the value. ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 17: Setting Humidity Values

    The precision air control the humidity around the return air vent of the conditioner precision air conditioner to the humidity of 50% RH. performs the humidification Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 18: Setting Temperature And Humidity Values

    Return-air: For a hot aisle, select Hot-aisle, Return-air to control the temperature and Return-air, or humidity around the air return vent of the Supply-air as precision air conditioner. required. The Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 19 Hot aisle sensor Sets the sensors in hot Enable the corresponding humidity and 1, 2, 3 aisles to Enable. temperature sensor installed in the hot aisle. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 20: Setting Communications Parameters (Ip Address Settings)

    If Connection mode is set to Server, one precision air conditioner can be accessed by a maximum of two element management system (EMS) clients at the same time. If Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 21 Server: If the precision air conditioner and EMS do not need to access the Internet (the precision air conditioner and the EMS are in the same LAN), set Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 22: Setting Snmp Parameters

    One precision air conditioner supports concurrent access of up to 10 NMSs through SNMP. Procedure Step 1 On the home screen, choose Settings > Comm Settings > SNMP Settings. Figure 3-9 displayed. Figure 3-9 Setting SNMP communications parameters Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 23 Enter a planned value for User Name, select values for Auth. Protocol and Prop. Protocol from drop-down list boxes, and click , as shown in Figure 3-12. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 24 , as shown in Figure 3-13. Figure 3-13 Setting an SHA password Set AES Password and Confirm Password, and click , as shown in Figure 3-14. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 25 SNMP Port is set to 161 by default. If you modify SNMP Port and click Submit, a warning is displayed, saying that the monitoring system will restart, as shown in Figure 3-16. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 26 Export File under MIB File to export the MIB file to the USB flash drive for the customer's use in accessing a third-party NMS. Figure 3-18 shows successful file export. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 27: Setting Teamwork Control Parameters

    If the address of any unit amid the range is unavailable, the teamwork topology shows that this device is offline. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 28 If the teamwork function is Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 29 In  When the one teamwork, the requirement control temperature and is Yes, the master Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 30 Figure 3-20. Table 3-7 describes the note for the screen. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 31 Ground color: red, Red indicates that a critical alarm is generated, as bright gray, dark gray shown in Bright gray indicates that the device is operating Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 32: Optional) Setting Alarm Parameters

    Power underfreq alarm threshold < Power overfreq alarm threshold Supply-air HT alarm threshold + 5°C ≤ Return-air HT alarm threshold  Supply-air HT alarm threshold + 5°C ≤ Hot aisle HT alarm threshold  Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 33 Be careful when configuring alarms. Only professional maintenance personnel can change alarm settings. Procedure Step 1 Choose Settings > Alarm Settings > T/H Sensor on the home screen. Figure 3-21 displayed. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 34: Commissioning Guide

    Admin or Engineer user. Ensure that the precision air conditioner is started before operation. Procedure Step 1 Choose Maint > Diagnostic Mode > Enter > Yes. Figure 3-23 is displayed. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 35: Commissioning Air Conditioner Components

    If you need to manually turn on or off system components in diagnostic mode, log in as the Admin or Engineer user. Ensure that the precision air conditioner is started before operation. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 36 Step 2 Tap On for Electric heater, as shown in Figure 3-24. Figure 3-24 Starting up the electric heater After the electric heater is started, the Off following the Electric heater turns into On. ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 37: Maintenance Guide

     The temperature and humidity curves show the current average temperature and humidity of the control type. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 38: Querying Alarms

    Click each alarm to open the Details page, which contains Alarm Name, Severity, Location, Cause ID, SN, Possible Causes, and Procedure for the alarm, as shown in Figure 4-3. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 39 Figure 4-4 is displayed. Figure 4-4 Querying historical alarms Historical alarms are displayed in chronological order. The latest cleared alarm is displayed in the uppermost row. ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 40: Querying Logs

    4.1.4 Querying Device Runtime Procedure Step 1 On the home screen, choose Maint > Performance Maint. Figure 4-6 is displayed. Figure 4-6 Performance maint screen ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 41: Querying Component Status

    Running > Device Details > Compressor on the home screen to query the status of the compressor and solenoid valve, as shown in Figure 4-8. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 42: Querying System Parameters

    When viewing system parameters through Device Details (using the compressor as an example), choose Running > Device Details > Compressor on the home screen to view the compressor parameters, as shown in Figure 4-10. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 43: Querying Version Details

    Figure 4-11 About screen Step 2 On the About screen, tap Version Info or E-label. Figure 4-12 is displayed. Figure 4-12 Version info and E-label Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 44: Changing Parameters

    Step 1 On the home screen, choose Alarms > Delete Hist. Alarms to enter the Delete Hist. Alarms screen shown in Figure 4-13. Figure 4-13 Delete hist. alarms screen Step 2 Tap Yes to delete all historical alarms. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 45: Deleting Logs

    USB flash drives with good compatibility. You are advised to use these USB flash drives to perform data export. Table 4-1 Recommended USB flash drives Model Capacity Netac U188 4 GB Kingston DT101G2 8 GB Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 46 Then tap Yes in the displayed dialog box shown in Figure 4-15. Enter the Processing Info screen shown in Figure 4-16. Figure 4-15 Warning dialog box Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 47: Clearing The Runtime

    To clear the runtime of the precision air conditioner, log in as the Admin or Engineer user. Performance value clearance can be performed only after component maintenance. Otherwise the component may run overtime and degrade performance. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 48: Calibrating A Sensor

    To calibrate a sensor, log in as the Admin or Engineer user. Procedure Step 1 On the home screen, choose Maint > Sensor Adjust. Figure 4-19 is displayed. Figure 4-19 Sensor adjust screen Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 49: Calibrating The Screen

    When calibrating the screen by tapping the screen, tap Maint > Screen Calib to enter the following screen, as shown in Figure 4-20. Figure 4-21 is displayed when the screen calibration is complete. Figure 4-20 Screen calibration page Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 50 Flip toggle switch 1 for the LCD to ON, and others to the opposite position. You need to manually operate the operation again from Step 1 to trigger the touchscreen calibration function after the calibration failure. ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 51: Faq

    To set the preceding parameters, log in as the Admin, Engineer, or Operator user. Procedure Step 1 On the home screen, choose Settings > User Settings. Figure 5-1 is displayed. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 52: How To Change A Password

    Step 2 Tap Password to enter the password changing screen, as shown in Figure 5-3. The password consists of six digits and not supports letters or special characters. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 53: How To Restore The Initial Password

    If a user forgets the changed password, the user can use the DIP switch S2 on the main control board to restore the password to the initial password. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 54 Step 4 Disconnect the main power supply of the device. Step 5 Set all bits of the DIP switch S2 to non ON. Step 6 Connect the main power supply of the device. ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 55: How To Troubleshoot The Fault When The System Is In Upgrade Mode

    E-label board, and then power on the system. Step 3 If the fault persists, contact Huawei technical support. ----End 5.6 How to Fast Shut Down an Air Conditioner Procedure Step 1 On the home screen of the ACC, tap Shutdown.

  • Page 56: How To Manually Clear Alarms

    A humidity and temperature sensor needs to be enabled after it is installed in an aisle.  To enable a sensor, log in as the Admin or Engineer user. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 57: How To Check Teamwork Control Information

    Figure 5-7 Teamwork control information screen  Master/Slave and Active/Standby indicate the information of this single unit. Other information is about the teamwork control information of the group. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 58: Which Parameters Are Restored To Default Values After Default Settings Are Operated

    EMS is disconnected. The communication addresses must be reset to recover the communication. 5.11 How to Change the SSH Access Password Context Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 59 Figure 5-8 Login window Step 2 Enter your user name and password. The preset user name and password are root and Changeme respectively, as shown in Figure 5-9. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 60 Step 3 After your successful login, enter the passwd command to change the password. In the displayed window, enter a new password and confirm it, as shown in Figure 5-10. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 61: Rectifying Faults Of The E-Label Identification Board

    If the information shown in Figure 5-11 is displayed on the controller LCD, the precision air conditioner can run properly. To remove this tip, perform Step Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 62 If yes, continue with Step Step 4 Check whether cables are properly connected.  If yes, contact Huawei technical support to replace the E-label identification board. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 63: Importing A Certificate And Key

     If no, reconnect or replace cables and perform Step Step 5 Reconnect the main power supply of the precision air conditioner. Step 6 If the fault persists, contact Huawei technical support. ----End 5.13 Importing a Certificate and Key Prerequisites...
  • Page 64 Advanced Cooling Controller User Manual 5 FAQ ----End Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 65: A Parameter Description

    LCD contrast Sets the contrast of the ACC LCD. LCD saturation Sets the saturation of the ACC LCD. Sets the brightness of the ACC LCD brightness Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 66  Block: New alarms are not reported to the EMS. The EMS can still detect the Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 67 1 starts first. After the cooling requirement increases, system 2 also starts.  No. 2 system first: When cooling is required, system Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 68 Cooling off delay Sets the time delay for cooling 180s when the ambient temperature reaches the lowest temperature based on the Temp set point. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 69 Anti-cond temp diff, the anti-condensation protection function is enabled. You are not recommended to change the value. Anti-cond delay Sets the time delay for 20 min Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 70 Return-air temp Sets the return air temperature  NetCol8000-C: set point set point for a precision air 24.0° C conditioner after T/H control  NetCol5000-A035 Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 71 Indicates the parameter related period to the control algorithm for the compressor rotational speed or chilled water valve openness. Indicates the parameter related  NetCol5000-A035 Temp p-band Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 72 (025), value. NetCol5000-A020, NetCol5000-C: 10.0% RH Humid deadband Indicates the parameter related 0.0% RH to required humidity calculation. You are not recommended to change the Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 73 You are not recommended to change the value. Startup delay Sets the delay time for starting  NetCol5000-A035 Home Screen > a compressor after startup (025), Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 74 : 60 min frequency before forcibly  NetCol5000-A035 entering the oil return mode. (025): 2 h You are not recommended to Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 75 1.60 Mpa freq rise forcibly increasing the compressor frequency. Suction HP for Sets the suction pressure for 1.65 Mpa speed rise limit indoor fan speed rise limit. Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 76 To avoid condensation, the frequency of the compressor should be forcibly decreased when the temperature difference between the supply air and dew-point is smaller Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 77 When the system is started, the 180s shielding time system pressure is relatively low. The precision air conditioner will automatically shield the low pressure protection, which will be Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 78 Return water Disable temp sensor Sets the minimum rotational  NetCol5000-A035 Home Min speed Screen > speed for the indoor fan. (025), Settings > NetCol5000-C: Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 79 Indicates the parameter related NetCol5000-A020 temp diff to the speed adjustment logic : 2.0° C of the indoor fan. You are not  NetCol5000-C: recommended to change the Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 80 Stop delay Sets the delay time for shutting down the indoor fan when the Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 81 Water L-shaped supply time = Water supply humidifier: 54s time x Water supply rate.  NetCol8000-C: S-shaped humidifier: 36s L-shaped humidifier: 62s Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 82 Consistent with the Screen > Settings Chinese or English. current interface Settings > language Quick Settings Date format Sets the date display format Consistent with the Home Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 83 1° C. temp adj value, cold-aisle temp adj value, cold-aisle humid adj value, hot-aisle temp adj value, hot-aisle humid adj value, liquid Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 84 A Parameter Description Menu Parameter Description Default Value pipe temp adj value, comp discharge temp adj value, comp discharge pres adj value, comp suction pres adj value Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 85: B Acronyms And Abbreviations

    SNMP Simple Network Management Protocol universal serial bus Issue Draft A (2014-12-26) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

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