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Liebert vNSA Network Switch for Liebert iCOM Controls Connects multiple cooling units equipped with Liebert iCOM unit controls, allowing them to communicate and function as a team, and also supports lead/lag operation. Improve the thermal system in your data center with Vertiv's performant and rapidly deployable evaporative cooling, free cooling and other thermal solutions.
Precision Cooling
For Business-Critical Continuity™
For Business-Critical Continuity™
Liebert
®
iCOM
™
User Manual - Intelligent Communications & Monitoring
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Table of contents- 1.0 Introduction
- 1.1 Features
- Large and Small Displays
- 1.1 Features
- 2.0 Liebert iCOM Display Components and Functions
- 2.1 Navigating Through the Liebert iCOM Menus
- 2.1.2 Accessing Submenus
- 2.1.3 Entering a Password
- 2.1.4 Viewing Multiple Units with a Networked Large Display
- 2.1 Navigating Through the Liebert iCOM Menus
- 3.0 Operation
- 3.1 Single Unit Functions
- 3.1.1 Unit/Fan Control
- Start - Stop
- 3.1.2 Chilled Water Units with Variable Speed Motor
- 3.1.3 General Compressor Requirements
- 3.1.1 Unit/Fan Control
- 3.2 Motorized Ball Valve in Digital Scroll Units
- 3.3 Temperature Control—Single Source Cooling (No Extra Cooling Coil)
- 3.3.1 Temperature Proportional Band
- 3.3.2 Compressor Control
- Compressor Proportional Bands
- 3.3.3 Chilled Water Control
- 3.4 Temperature Control—Second Cooling Source
- 3.4.1 Differential Temperatures / Controls (Comparator Circuit)
- 3.5 Temperature Control—Reheat
- 3.5.1 Three-Stage Electric, Hot Gas and Hot Water Reheat
- 3.5.2 SCR Reheat
- 3.6 Humidity Control
- 3.6.1 Humidification
- Infrared Humidifier
- 3.6.2 Dehumidification
- Dehumidification Compressor Quantity
- 3.6.1 Humidification
- 3.7 Control Types
- 3.7.5 User Inputs / Customer Inputs
- 3.7.6 Event Types and Properties
- 3.8 Possible Event Notifications
- 3.9 Next Maintenance Calculation
- 3.9.1 Calculation of Next Maintenance and Diagnostics
- 3.1 Single Unit Functions
- 4.0 Teamwork
- 4.1 Teamwork Modes
- 4.1.3 Teamwork Mode 1
- 4.1.5 Standby – Rotation
- 4.1 Teamwork Modes
- 5.0 Installing a Liebert iCOM Unit-to-Unit Network
- 5.2 U2U Hardware: Cables and Network Switch
- 5.3 Wiring for Unit-to-Unit Communications—U2U
- Liebert iCOM U2U Ethernet Network
- 5.3.1 Wiring a Liebert iCOM U2U Network
- Small Displays
- Combining Large and Small Displays on a U2U Network
- Liebert vNSA
- 6.0 Mounting a Large Display on a Wall
- 6.0.1 Location Considerations
- Mounting Instructions
- 6.0.1 Location Considerations
- 7.0 User Menu Parameters
- Spare Part List—Large Display Only
- Active Alarms
- 8.0 Service Menu Parameters
- Unit Diary—Large Display Only
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Figure 14 Two compressors with unloaders (four-step). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 15 Digital scroll capacity modulation, 10-100% variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 16 Single and dual digital scroll compressor activation points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 17 Three-point actuator control (example: cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 18 Second cooling source and compressorized cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 19 Three-stage heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 20 Two single-step compressors with SCR reheat set to Tight mode . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 21 Two single-step compressors with SCR reheat set to Standard mode. . . . . . . . . . . . . . . . . . . . . . 26
Figure 22 Humidity proportional band. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 23 Teamwork Mode 1 with two cooling units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 24 Connecting two cooling units, each with a small display using a crossover Ethernet cable . . . . 44
Figure 25 Wiring a small display for stand-alone operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 26 Wiring a small display for U2U network operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 27 Wiring a large display for stand-alone operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 28 Wiring a large display for U2U network operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 29 Liebert iCOM input-output control board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 30 Liebert vNSA with optional remote large display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 31 Liebert iCOM display dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 15 Digital scroll capacity modulation, 10-100% variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 16 Single and dual digital scroll compressor activation points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 17 Three-point actuator control (example: cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 18 Second cooling source and compressorized cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 19 Three-stage heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 20 Two single-step compressors with SCR reheat set to Tight mode . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 21 Two single-step compressors with SCR reheat set to Standard mode. . . . . . . . . . . . . . . . . . . . . . 26
Figure 22 Humidity proportional band. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 23 Teamwork Mode 1 with two cooling units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 24 Connecting two cooling units, each with a small display using a crossover Ethernet cable . . . . 44
Figure 25 Wiring a small display for stand-alone operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 26 Wiring a small display for U2U network operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 27 Wiring a large display for stand-alone operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 28 Wiring a large display for U2U network operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 29 Liebert iCOM input-output control board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 30 Liebert vNSA with optional remote large display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 31 Liebert iCOM display dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50