Dual Cooling at 100% Capacity – No Dead Band | Liebert TM-10098

Dual Cooling at 100% Capacity – No Dead Band

iCOM Control Training and Service Manual

2-Stage or 4-Stage control method. If the chilled water temperature is not cold enough the valve control band is replaced by the compressor band.

Dual Cooling at 100% Capacity – No Dead Band

Temp Set Point + (1/2 Proportional Band + 1/2 Proportional Band)
Temp Set Point: 70°
Proportional Band: 8°
				100%		Cool 1 On		Cool 2 On
				Open		Cool 1 On
Valve				Open
Valve
Closed
70	71	72	73	74	75	76	77	78	79
	Band 1 Chilled Water				Band 2 Compressors
		Valvel
							Increasing Temperature

An addition program available with the Dual Cooling option is called Minimum Chilled Water Temperature. This program allows the end user to select the minimum chilled water temperature that permits simultaneous operation of the chilled water control and compressor control. When the supply chilled water temperature decreases to this programmed value ONLY the chilled water valve control is operational, the compressors are locked out.

Staged Electric Reheat

The basic temperature heating control band is established at the temperature set point with the length equal to ½ of the programmed temperature proportional band divided by the number of reheat stages.

The Liebert DS units are supplied with three (3) reheat stages (elements), each stage is rated at 1/3 of the unit capacity. The three (3) stages will operate in an on/ off configuration to reheat the unit discharge air as it enters the space.

The temperature controller activates the first electric heating stage when the return air temperature decreases to 33% of the heating proportional band. The second electric heating stage activates when the return air temperature decreases to 66%

21

Image 22

Liebert TM-10098 service manual Dual Cooling at 100% Capacity – No Dead Band, Staged Electric Reheat

Contents

Large Systems Environmental Training and Service ManualTM-10098:Rev. 02/06 iCOM Microprocessor iCOM Control Training and Service Manual Training & Service ManualiCOM Page Chapter 1 Temperature/ Humidity Control Table of ContentsiCOM Control Training and Service Manual Chapter 3: iCOM Hardware Connections Chapter 4: General Troubleshooting DataChapter 2: Programming Functions iCOM Controls Training and Service Manual Glossary of Terms How To Use The SchematicsElectrical Schematics Computer and Network Terms Cooling and/ or Heating Required, in Percent % Chapter Temperature and Humidity Control ProgramsTemperature Control Program Types iCOM Controls Training and Service Manual Knowledge Base/Decision Making iCOM Control Training and Service ManualMembership Consequence Proportional P Control iCOM Controls Training and Service ManualProportional + Integral PI Control iCOM Control Training and Service Manual Proportional + Integral + Derivative PID Control iCOM Controls Training and Service Manual A suggested tuning procedure is as follows Temperature Control Operations and ChartsiCOM Control Training and Service Manual 2 Stage Compressorized Cooling – No Dead Band Temp Set Point + 1/2 Proportional Band iCOM Control Training and Service Manual 2 Stage Compressorized Cooling – With Dead Band STAGECOMPRESSORS, UNLOADER STATE 4 Stage Compressorized Cooling – No Dead Band Temp Set Point + 1/2 Proportional Band 4 Stage Compressorized Cooling – With Dead Band iCOM Controls Training and Service ManualSTAGE TEMPERATURE iCOM Control Training and Service Manual As the return air temperature increases Cooling 1, lead compressor unloaded, is activated at 72F or ½ of the dead band value plus 25% of the cooling control band. If the return air temperature continues to increase Cooling 2, lag compressor unloaded, will activate at 73F or ½ of the dead band value plus 50% of the cooling control band. If the return air temperature continues to increase Cooling 3, lead compressor unloaded, is activated at 74F or ½ of the dead band value plus 75% of the cooling control band. If the return air temperature continues to increase Cooling 4, lag compressor loaded, will activate at 75F or ½ of the dead band value plus 100% of the cooling control band Switch 1st compressor ON iCOM Controls Training and Service Manual1 compressor operation Switch 2nd compressor ON iCOM Control Training and Service Manual Glycool at 100% Capacity – No Dead Band Glycool at 50% Capacity – No Dead Band iCOM Controls Training and Service ManualDual Source Cooling Dual Cooling at 100% Capacity – No Dead Band Staged Electric Reheat 3 Stage Electric Reheat – No Dead Band iCOM Controls Training and Service ManualTemp Set Point - 1/2 Proportional Band 3 Stage Electric Reheat - With Dead Band Humidity Control Humidity Control Program Types Humidity iCOM Control Training and Service ManualHumidity Proportional iCOM Controls Training and Service Manual Operations and ChartsHumidifier Operation Relative Humidity Control Infrared Humidification – No Dead Band iCOM Control Training and Service ManualHumidity Set Point - 1/2 Proportional Band iCOM Controls Training and Service Manual Infrared Humidification – With Dead Band iCOM Control Training and Service Manual Autoflush Control Flow Chart Dehumidification Operation Humid Set Point: 50% iCOM Controls Training and Service Manual Humidity Set Point + 1/2 Proportional Band Reheating during Dehumidification ParameterOperation iCOM Controls Training and Service ManualNo Normal Delayed Auto restart Additional ProgramsStart iCOM Control Training and Service Manual Suction Pressure Transducer Fan Alarm / Fan settingsHigh Pressure Cutout Call for Cooling iCOM Control Training and Service Manual The Startup and Freeze Protection Program Calculation of next Maintenance Parameters Next Maintenance CalculationiCOM Controls Training and Service Manual The Maintenance Calculation is done as follows General Maintenance Settings Parameters for next Maintenance CalculationiCOM Control Training and Service Manual Shared Parameters an understanding Understanding the iCOM Network setup process Networking and FunctionsiCOM Control Training and Service Manual iCOM Controls Training and Service Manual The Basics for HardwareThe Basics for Cooling Unit Placement The Basic for Programming iCOM Control Training and Service Manual Example: Display: Example: Control Board: Unit No. Setting ParametersiCOM Controls Training and Service Manual Unit No. Switch iCOM Control Training and Service ManualPower Unit No. iCOM Controls Training and Service Manual U2U:Switc iCOM Control Training and Service Manual Line S802: Number units connected: xx 01 - Teamwork Modes TeamworkiCOM Controls Training and Service Manual “No” Teamwork Teamwork Mode Unit Lead/ Lag or Running/ Standby FunctioniCOM Control Training and Service Manual Typical Lead/ Lag Running/ Standby Function iCOM Controls Training and Service Manual Standby & Cascade Notes iCOM Control Training and Service Manual Small Graphic Display with Panel Mount Bezel ChapterProgramming Functions Optional Large Graphic Display with Panel iCOM Keyboard Layout iCOM Display Components and FunctionsiCOM Control Training and Service Manual Icon iCOM Controls Training and Service ManualiCOM Keyboard Layout Key Name iCOM Display Symbols/ Icons iCOM Control Training and Service Manual Programming Functions Status Display Level 2: Service Menu Screens ICON Symbols Menu Parameters NamesiCOM Control Training and Service Manual Level 1: User Icon User Menu Icons and DescriptionsiCOM Controls Training and Service Manual Name Service Menu Icons and Descriptions C/ F User Menu Parameters Menu ParametersAdvanced Menu Icons and Descriptions iCOM Controls Training and Service Manual User Menu: Set Point Parameters U100 series DefaultUser Menu: Spare Parts List, Large Display Only Menu Line User Menu: Graphics Parameters iCOM Controls Training and Service ManualDefault Parameter Menu Line User Menu: Set Alarm Parameters U200 seriesDefault Parameter User Menu: Display Setup Parameters U400 series iCOM Controls Training and Service ManualUser Menu: Active Alarms Parameters Parameter Default User Menu Total Run Hours Parameters U500 series iCOM Control Training and Service ManualDefault Menu Line Menu Line iCOM Controls Training and Service ManualUser Menu: Service Contacts U700 series Parameter Default Service Menu ParametersiCOM Control Training and Service Manual Menu Line Menu Line DefaultService Menu: Unit Diary Log Parameter Parameter Default iCOM Control Training and Service ManualDefault Menu Line Menu Line DefaultDefault Parameter Default iCOM Control Training and Service ManualDefault Menu Line Default iCOM Controls Training and Service ManualDefault Parameters: Page 6 of Menu Line iCOM Control Training and Service ManualDefault Parameter Parameter iCOM Controls Training and Service ManualMenu Line Range Parameter iCOM Control Training and Service ManualMenu Line Range Default DefaultService Menu Set Alarm Parameters Menu Line Service Menu Set Alarm Parameters iCOM Control Training and Service ManualService Menu: Set Alarm Parameters: Page 3 of Menu Line Service Menu Set Alarm Parameters iCOM Controls Training and Service ManualService Menu: Set Alarm Parameters: Page 5 of Menu Line Parameter iCOM Control Training and Service ManualMenu Line Range Default iCOM Controls Training and Service ManualDefault Menu Line Default iCOM Control Training and Service ManualDefault Menu Line Default iCOM Controls Training and Service ManualDefault Menu Line Default iCOM Control Training and Service ManualDefault Menu Line Menu Code Advanced Menu ParametersiCOM Controls Training and Service Manual Parameter Default iCOM Control Training and Service ManualDefault Menu Code Default iCOM Controls Training and Service ManualDefault Menu Code Parameter DefaultMenu Code Range Parameter DefaultMenu Code Range Type Events Notifications ParametersiCOM Control Training and Service Manual Description Large Display Type Events Notifications Parameters continuediCOM Controls Training and Service Manual Description Large Display Type iCOM Control Training and Service ManualEvents Notifications Parameters continued Description Large Display iCOM Controls Training and Service Manual Events Notifications Parameters continuedEvent ID number, Description and Function Default iCOM Control Training and Service Manual LOSS OF iCOM Controls Training and Service Manual HUM HRS Unit COMP iCOM Control Training and Service Manual DIG SCROLL2 UNIT CODE iCOM Control Training and Service Manual MISMATCH Introduction ChapterControl Board Connections iCOM Controls Training and Service Manual iCOM Control Training and Service Manual LCD Display BoardLarge Disdplay Small Display Unit Mounted Control Board Control Board DIP Switches and Plug ConnectorsiCOM Controls Training and Service Manual Connector iCOM Control Training and Service ManualiCOM Control Board DIP Switch #2 Settings Setting Setting iCOM Controls Training and Service ManualiCOM Control Board Jumper Settings Default Setting Default Setting Large Display Jumper SettingsSetting Small Display DIP Switch #3 Settings Setting iCOM Controls Training and Service ManualSmall Display Jumper Settings Default Setting P4 24 VAC Power DS SystemsiCOM Control Training and Service Manual P8: 24 VAC Alarm Inputs P32: Compressor Devices iCOM Controls Training and Service ManualP22 Glycool Valve Std. Pressure Actuator P33: Compressor Devices P39: Firestat & Remote Shutdown iCOM Control Training and Service ManualP38 Smoke Detector P40: Basic Unit Connections P64: Unit Large Display Digital Signals iCOM Controls Training and Service ManualP65: Optional Intelleslot Power Suplly P66: Unit Small Display Digital Signals P4: 24 VAC Power Fuse Board Layout: All UnitsiCOM Control Training and Service Manual P41: 24 VAC Power Temperature/ Humidity Assembly Housing Temperature/ Humidity Board: All UnitsiCOM Controls Training and Service Manual Temperature/ Humidity Board NOTES iCOM Control Training and Service Manual C P U General Troubleshooting DataChapter iCOM Controls Training and Service Manual iCOM Control Training and Service Manual IsolationAreas of Control Semiconductor BASIC OPERATION OF THE TRIACiCOM Controls Training and Service Manual Semiconductor Showing No Movement of Electrons Schematic Drawing for the Triac iCOM Control Training and Service ManualFront and Left Side Views of the Triac Output Opto-Isolator Basic Operation of the Opto-IsolatorInput Opto-Isolator Output Opto-IsolatorPin Location Troubleshooting the Output Opto-IsolatoriCOM Control Training and Service Manual OUTPUT VOLTAGE CHECK Input Opto-IsolatorPin Location Troubleshooting the Input Opto-IsolatoriCOM Controls Training and Service Manual INPUT VOLTAGE CHECK iCOM Control Training and Service Manual Alarm Input Opto-IsolatorLegendMicroprocessor Control Board Opto iCOM Controls Training and Service Manual Control Output Opto-IsolatorLegendControl Output Triac Legend Opto iCOM Diagnostics / Service Mode Program iCOM Control Training and Service Manual Programming Basic Troubleshooting StepsiCOM Controls Training and Service Manual DC Voltage check iCOM Control Training and Service Manual If 24 VAC is present perform the following Moisture Content Charts iCOM Controls Training and Service Manual Grains Per Cu Ft iCOM Control Training and Service ManualMoisture Content at Temperature = 80F 26.7ºC Grains Per Lb Grains Per Cu Ft iCOM Controls Training and Service ManualMoisture Content at Temperature = 79F 26.1ºC Grains Per Lb Grains Per Cu Ft iCOM Control Training and Service ManualMoisture Content at Temperature = 78F 25.6ºC Grains Per Lb Grains Per Cu Ft Moisture Content at Temperature = 77F 25.0ºCGrains Per Lb Grains Per Cu Ft Moisture Content at Temperature = 76F 24.4ºCGrains Per Lb Grains Per Cu Ft iCOM Controls Training and Service ManualMoisture Content at Temperature = 75F 23.9ºC Grains Per Lb Grains Per Cu Ft Moisture Content at Temperature = 74F 23.3ºCGrains Per Lb Grains Per Cu Ft iCOM Controls Training and Service ManualMoisture Content at Temperature = 73F 22.8ºC Grains Per Lb Grains Per Cu Ft iCOM Control Training and Service ManualMoisture Content at Temperature = 72F 22.2ºC Grains Per Lb Grains Per Cu Ft Moisture Content at Temperature = 71F 21.7ºCGrains Per Lb Grains Per Cu Ft iCOM Control Training and Service ManualMoisture Content at Temperature = 70F 21.1ºC Grains Per Lb Grains Per Cu Ft iCOM Controls Training and Service ManualMoisture Content at Temperature = 69F 20.6ºC Grains Per Lb Grains Per Cu Ft iCOM Control Training and Service ManualMoisture Content at Temperature = 68F 20.0ºC Grains Per Lb Grains Per Cu Ft Moisture Content at Temperature = 67F 19.4ºCGrains Per Lb Grains Per Cu Ft iCOM Control Training and Service ManualMoisture Content at Temperature = 66F 18.9ºC Grains Per Lb Grains Per Cu Ft iCOM Controls Training and Service ManualMoisture Content at Temperature = 65F 18.3ºC Grains Per Lb Suction Transducer Information Codes A124-A128 iCOM Control Training and Service Manual NTC Code S606 and S608 Digital Scroll High Temperature Sensor ChartiCOM Controls Training and Service Manual iCOM Control Training and Service Manual Unit Code DescriptionFACTORY SERVICE TECHNICIAN Troubleshooting Checklist iCOM Controls Training and Service Manual Set Alarms Glossary of Unit and System Parameters User MenuiCOM Control Training and Service Manual Code Timer iCOM Controls Training and Service ManualDisplay Setup Code Standby settings / Lead-lag Service MenuService contacts Wellness / General Settings Compr. 1 Settings iCOM Controls Training and Service ManualFan Settings Compr. 2 Settings Diagnostics / Service El. Heater 3 SettingsHumidifier Settings Code Code iCOM Controls Training and Service ManualSet Alarms Type Options Setup iCOM Control Training and Service ManualSystem / Network Setup Code Service contacts Advanced MenuiCOM Controls Training and Service Manual Factory Settings Access iCOM Control Training and Service ManualCode Glossary of Terms iCOM Controls Training and Service Manual iCOM Control Training and Service Manual Hysteresis: Differential iCOM Controls Training and Service Manual Input: An incoming information signal iCOM Control Training and Service Manual Prefill: The period of time between when the water begins to fill the pan and the humidifier lamps turn on Computer and Network Terms iCOM Controls Training and Service Manual Ethernet: A local-areanetwork LANarchitecture developed by Xerox Corporationin cooperation with DECand Intelin 1976. Ethernet uses a bus or star topologyand supports data transfer ratesof 10 Mbps. The Ethernet specification served as the basis for the IEEE 802.3 standard, which specifies the physicaland lower softwarelayers. Ethernet uses the CSMA/CDaccess method to handle simultaneous demands. It is one of the most widely implemented LAN standards iCOM Controls Training and Service Manual •the type of error checking to be used iCOM Control Training and Service Manual There are a variety of standard protocols from which programmerscan choose. Each has particular advantages and disadvantages; for example, some are simpler than others, some are more reliable, and some are faster. From a userspoint of view, the only interesting aspect about protocols is that your computeror device must supportthe right ones if you want to communicate with other computers. The protocol can be implemented either in hardwareor in software iCOM Controls Training and Service Manual Understanding IP Addressing: Every computer that communicates over the Internet is assigned an IP address that uniquely identifies the device and distinguishes it from other computers on the Internet. An IP address consists of 32 bits, often shown as 4 octets of numbers from 0-255represented in decimal form instead of binary form. For example, the IP address 168.212.226.204 in binary form is: What is networking?… Network InformationiCOM Control Training and Service Manual HUBS AND SWITCHES UNIT IDENTIFICATION OR ADDRESSING iCOM Controls Training and Service ManualTwisted pair - 10baseT - UTP Cable How To Use The Schematics iCOM Control Training and Service Manual iCOM Controls Training and Service Manual Electrical Schematics182769 Liebert DS iCOM Global Control 8 - 12 Ton iCOM Control Training and Service Manual