Emerson iCOM user manual Standard Mode

Page 32

Operation

Standard Mode

In Standard mode, the SCR reheat operates only when the Temperature Proportional Band calls for heating. SCR reheat output is adjusted proportionally as the Temperature Proportional Band varies the requirement for heating from 0% to -100%. Compressors operate only when there is a call for cool- ing as described in 3.3.2 - Compressor Control.

Figure 21 illustrates how SCR reheat operates when SCR Control Type is set to Standard mode.

Figure 21 Two single-step compressors with SCR reheat set to Standard mode

Temp Setpoint: 70°F

 

Cool 2

Proportional Band : 8°F

Cool 1

On

Deadband : 0°F

On

 

 

 

 

SCR

 

 

On

 

66

67

68

69

70

71

72

73

74

-100%

0%

 

100%

Heating

Cool 1 Off

Cool 2

Cooling

 

SCR Off

Off

 

½ Proportional Band

½ Proportional Band

SCR On

Cooling 1 On

Cooling 2 On

26

Page 31 Page 33
Image 32
Page 31 Page 33
Contents Liebert iCOM Page Table of Contents Mounting a Large Display on a Wall Installing a Liebert Icom UNIT-TO-UNITNETWORKTeamwork Figures Tables Features Large and Small DisplaysESC Keyboard icons and functions Icon Key Name FunctionStatus menu, large display, graphical view Accessing Submenus Accessing Submenus on Small DisplaysAccessing Submenus on Large Displays Navigating Through the Liebert iCOM MenusEntering a Password Menu tree-Small display, stand-alone or networkedAdvanced Menu Unit Service Menu UnitStatus Menu System View Status Menu Unit 1 View User Menu Advanced Menu Unit # Service Menu Unit #Viewing Multiple Units with a Networked Large Display SET User menu icons Service menu icons Single Unit Functions Unit/Fan Control Start StopLoss of Power Alarm Fan Alarm / Fan Protection SettingsVSD Setpoint VSD Fan Speed Setting AutorestartHigh Pressure Alarm Pump DownCompressor Sequencing Digital Scroll High TemperatureCompressor Timing-Units With Two Compressors MBV Operation After Compressor is Turned Off Service Offset-Changing System Pressure SettingsMotorized Ball Valve in Digital Scroll Units Temperature Proportional Band Temperature proportional bandCompressor Control Compressor Proportional BandsOne Single-Step Compressor Without Unloaders-One-Step Two Single-Step Compressors Without Unloaders-Two-StepTwo Compressors With Unloaders-Four-Step Two compressors with unloaders four-stepDigital Scroll Compressors Digital scroll capacity modulation, 10-100% variableTemperature Control-Second Cooling Source Differential Temperatures / Controls Comparator CircuitDelta T Temperature Difference Between Room and Glycol Chilled Water ControlSecond cooling source and compressorized cooling Temperature Control-Reheat Reheat configuration typesGlycool Cooling-Free-Cooling Dual Cooling SourceOff ½ Proportional Band Decreasing Temperature Heat On ½ Dead Band 100%Tight Mode SCR ReheatStandard Mode Humidification Humidity ControlHumidification Dehumidification External Humidifier Control-Optional Humidification Infrared HumidifierParameters for infrared humidifier control Dehumidification With Comp settings DehumidificationDehumidification Low Limit Dehumidification Compressor QuantityReheat During Dehumidification Temperature and Humidity Control TypesControl Types Humidity Sensor Reading Control Types High and Low, Temperature and Humidity Events Supply Limit-OptionalUser Inputs / Customer Inputs Customer inputsTime Delay Enable or DisableEvent Types and Properties Event TypesMain FAN Overload Possible Event Notifications Event notifications-large or small displayCalculating Unit Wellness Next Maintenance CalculationCalculation of Next Maintenance and Diagnostics Parameters for Next Maintenance Calculation General Maintenance SettingsFans / Heaters / Humidifier Settings and Diagnostics Compressor 1 / 2 Settings and DiagnosticsTeamwork Mode Teamwork ModesApplication of Teamwork Modes No TeamworkTeamwork Mode 1 with two cooling units Standby Rotation Typical Standby Lead/Lag Function Standby and CascadeMinimum Network Switch Requirements Placement of Cooling UnitsU2U Hardware Cables and Network Switch Liebert iCOM U2U Ethernet Network Wiring for Unit-to-Unit Communications-U2USample Liebert iCOM network configurations Wiring a Liebert iCOM U2U Network Small Displays Large DisplaysWall-Mount Large Display Combining Large and Small Displays on a U2U NetworkWiring a small display for stand-alone operation Wiring a large display for stand-alone operation Ports available for connecting Liebert iCOM control devices Liebert vNSA298 84mm 305mm 14.25 362mm DPN001136 Rev Mounting Instructions Location ConsiderationsNecessary Mounting Items Liebert iCOM display dimensions Spare Part List-Large Display Only Setpoints parametersSpare part list parameters-large display only Event log parametersSet alarms parameters Sensor dataDisplay setup parameters Active AlarmsActive alarms parameters Timer parameters-Sleep Mode Total run hours parametersService contacts parameters Service Menu Parameters Unit Diary-Large Display Only Unit diary parametersStandby settings / lead-lag parameters Maintenance / wellness settings parametersWellness COMP2 Wellness HEAT2 Diagnostics / service mode parameters ALM REL 7of Delay Enable Disab Enable Disab Comp 1 Overload Unit X Disconnected WRN Loss of Power LOP MSG, WRN, ALM Call Service MSG, WRN, ALM High Temperature Sensor calibration / setup parameters System / network setup parameters-large display only Network setup parameters GBPStatic RAM Not Available, Invalid, OK Options setup parameters HUM SteamService contact info parameters Service Menu Parameters Service Menu Parameters Page Ne t ItiTi n That
Top Page Image Contents