Large The Liebert DSE is available with either a large Liebert iCOM, which has a 320 x 240 dot matrix screen. The display shows up to 16 menu icons at a time, as well as descriptive text. This display can be used to control a single cooling unit or any cooling unit on a network, regardless of how it is connected—either integrated into a cooling unit or simply connected to the network and mounted...
NOTICE Risk of inadvertent system shutdown. Can cause loss of cooling and equipment damage. Pressing the On/Off key on a Liebert iCOM large display while the system screen is shown permits shutting down all units on the network. Large Liebert iCOM displays can view and control other units on the network when they are in the same group.
Liebert iCOM Display Components and Functions Table 1 Keyboard icons and functions Icon Key Name Function On/Off Key Begins Shutdown or Startup. Alarm Key Silences/Resets an alarm. Help Key Accesses integrated help menus. ESCape Key Returns to the previous display view.
Liebert iCOM Display Components and Functions Figure 3 Liebert iCOM default screen symbols cooling freecooling maintenance electric heat hot water dehumidification humidification Accessing and Identifying Status Screens The iCOM control has five different status screens that provide the user with information about the unit such as component operating status, active alarms, and operating temperature.
System screen—graphical interface NOTE The graphical system screen is shown above. The System screen type may be programmed differently based on user preference. See Liebert iCOM Display Readout on page 10 for more information. System Screen with Rack View of Sensors The System Screen with Rack View of Sensors will display the average, maximum and minimum of all connected sensors for the supply, return and remote sensors.
Figure 6 Unit screen NOTE A simple unit screen is shown above. The unit screen type may be programmed differently based on user preference. See Liebert iCOM Display Readout on page 10 for more information. ® ® ™ Liebert...
The temperatures shown at the top of the unit screen with rack view of sensors are determined by the configuration of the Liebert iCOM. The values are based on which sensors are used for controlling airflow, cooling capacity and humidification.
Liebert iCOM Display Components and Functions Unit Screen with EconoPhase View The unit screen with EconoPhase View provides a summary of individual unit operations including return and supply temperatures, EconoPhase Status, Pump Status, and other key information to the EconoPhase circuit.
2.2.1 Control Interface When the buttons on the Liebert iCOM have not been pressed for a short period, the display backlight turns off. Pressing any key will turn the backlight on (wake up the screen) and display the Status menu of the last cooling unit viewed.
Filtering can be enabled in the User/Display menu. Liebert iCOM Display Readout The Liebert iCOM supports multiple unit and system screen layouts. These screen layouts are configured on line U408 of the user menus, Display Setup icon. U408 Screen selections include: •...
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2.2.3 - Entering a Password. Press the Enter key from the main Liebert iCOM display to access the User, Service and Advanced menus. Then use the left / right arrows to move among the User, Service and Advanced menus. Press the Enter key to highlight the first icon.
Liebert iCOM Display Components and Functions 2.2.3 Entering a Password The password must be entered before any value of the menu item parameter can be changed. There are three levels of password for preventing unauthorized changes. 1. User menu password allows the operator the ability to change the parameters in the User menu.
Liebert iCOM Display Components and Functions Figure 12 Menu tree—Stand-alone Status Menu—System View Unit 1 will be displayed in the top right corner of the screen. Status Menu Unit 1 View User Menu Service Menu Advanced Menu Unit # Unit #...
Liebert iCOM Display Components and Functions 2.2.4 Viewing Multiple Units with a Networked Display When you first wake up the control, press the Esc key to return to the System view Status menu. This view shows an average of all the units on the network and any alarms present. To view a specific unit on the network, press either the Enter key or down arrow key.
Liebert iCOM Display Components and Functions Figure 14 User menu icons and descriptions User Menu password: 1490 Table 3 User menu icons Icon Name Description °C / °F % RH Setpoints View and change temperature and humidity setpoints Displays the various part numbers of the...
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Liebert iCOM Display Components and Functions Table 3 User menu icons (continued) Icon Name Description Records the run time of all components and allows 1234h Total Run Hours setting of limits on run time Sleep Mode Allows setback settings for non-peak operation...
Liebert iCOM Display Components and Functions Figure 15 Service menu icons and descriptions Service Menu password: 5010 Table 4 Service menu icons Icon Name Description °C / °F % RH Setpoints To view and change temperature and humidity setpoints Shows all entered program changes and maintenance...
Name Description Service Contact Contains key contact information for local service, Info including names and phone numbers ™ Liebert iCOM-DO Change settings for Liebert iCOM Discrete Output card Remote Sensors Change settings for Remote Sensors SENSORS ® ® ™ Liebert...
Operation PERATION The Liebert iCOM display provides viewing, trending and configuration capability for Liebert cooling units. All unit settings and parameters can be viewed and adjusted through three menus: User, Service and Advanced. All active alarms are displayed on the LCD and are annunciated.
Operation Each time a unit is powered on or off, an event is added to the Event Log in the User menu. NOTE Customer switches: remote On/Off (if used) and display On/Off switches are in series. A cooling unit will start only if both switches are On; if one of these switches is Off, the unit will stop.
Before the building management system can control the fan speed, two parameters in the control must be set. S146 “Fan Control Sensor” must read Manual and line S164 “Allow BMS to change Fanspeed” must be changed to YES at the Liebert iCOM. Both parameters are found in Service Menus > Service Setpoints.
Back-Draft Fan Damper The Liebert iCOM controller has the ability to operate EC fans at very low speed to effectively act as a back-draft damper. The power used to prevent air flow from entering a standby unit from the raised floor by spinning the fans at a low speed is much less expensive than the additional static that conventional mechanical dampers introduce while the unit is in operation.
Applying fan speed to direct expansion systems generates the issue of how to avoid freezing condensate on the coil when the unit operates below 100% fan speed. Liebert iCOM's advanced freeze protection provides the ability to predict freeze conditions and correct this condition automatically by adjusting the fan speed and compressor capacity.
The goal of the advanced high pressure protection routines are to prevent a high pressure lockout from occurring. The Liebert iCOM does this by constantly monitoring the condensing pressure. If the control has determined that pressure is not maintained, the compressor capacity will automatically adjust to help lower the operating pressure.
When a compressor’s motor overload becomes active for 10 continuous seconds, the motor overload alarm associated with the compressor will be activated and displayed on the Liebert iCOM Screen. While a compressor overload has been activated the compressor will be turned Off, and the lead-lag order of the tandem banks will be reversed.
The Temperature Control parameters are in the Service menu under the Setpoints submenu. The Temperature Setpoint parameter is in both the User Menu and Service Menu under Setpoints. The Liebert iCOM has two Temperature Control Types: • Proportional • PI Each control type affects the timing and intensity of the cooling/heating operations.
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Operation The integral term (sometimes called “reset action”) is calculated by measuring how much and how long the air temperature/humidity has been above or below the setpoint. If the actual air temperature/humidity is above the setpoint, the percent requirement is slowly but continuously increased until the total is sufficient to bring the return room air back to the setpoint.
Operation 3.2.1 Setting Up PI Control Three to 5 minutes integration time is usually good for most applications. The proportional band may depend on the amount of heat load and other factors. Use Table 6 as a guide for making the PI control settings.
Operation On single and dual digital scroll compressor systems, the first compressor is started at 25% calculated output from the temperature proportional band and stopped at 10%. On dual digital scroll compressor systems, the second compressor is started at 35% and stopped at 20%, see Figure 23. When a compressor is started, the solenoid is energized longer than it is de-energized to match the call for cooling.
When referring to Tandem Digital Scroll Compressors, the following naming conventions are used: • The terms Compressor 1A, Compressor 1B, Compressor 2A and Compressor 2B describe specific compressors within the Liebert iCOM software. • Tandem Digital Scroll Compressor Set 1 is composed of Compressor 1A and Compressor 1B.
Operation The digital compressor within the tandem compressor set will be activated upon a call for cooling. This compressor can ramp between 20% and 100% capacity to meet the room load. If the call for cooling increases above its available capacity the fixed compressor within that tandem compressor set will be activated and the digital compressor ramps down to its minimum speed.The Liebert DSE activates the compressors in the following manner based on the amount of cooling needed.
Operation 3.4.1 Electric, Hot Gas and Hot Water Reheat Different types of cooling units feature different types of standard electrical heating. Not all types offer hot gas or hot water reheat. The number of electrical heating stages also varies—some types of cooling units have single-stage electrical heating as standard and offer two-stage electrical heating as an option.
Contact technical support about any problems this routine may cause or for assistance adjusting the humidifier lockout and/or reset point. The Liebert iCOM has four humidity sensor control types: Dew Point, Relative, Compensated and Predictive. The humidity sensor adjusts how the Temperature and Humidity Control determines the percent requirement for humidification/dehumidification.
If this default control is changed, the relative humidity setpoint must be adjusted based on return air temperature to prevent from over humidifying the space. 3.5.1 Humidity Control Types The Liebert iCOM has two Humidity Control Types: • Proportional • PI Proportional—The control uses the humidity proportional band to determine which operation to perform (dehumidification/humidification) and how much capacity to provide.
Operation PI—If PI Control is selected, the percent humidification/heating requirement is calculated by combining two methods, proportional and integral. The proportional term is calculated in a manner similar to the previously described Proportional control. The integral term (sometimes called “reset action”) is calculated by measuring how much and how long the air humidity has been above or below the setpoint.
Steam Generating Canister Humidifier The Steam Generating Humidifier has its own separate control board that manages the canister and steam rate. Liebert iCOM sends an On-Off command to relay a call for humidification. 3.5.3 Dehumidification The Dehumidification Enable parameter (Service Menu, Options Setup) allows for enabling/disabling the dehumidification function.
Operation Dehumidification Low Limit Figure 28 Setpoints screen, page 3 of 9 NOTE When the unit is in relative humidity control, only the right side of the menu is displayed and dew point will display the left side of the menu. Figure 29 Dehumidification and reheat control bands Step 2 off Step 1 off...
Operation Low Limit 1 and Low Limit 2 are used to avoid overcooling a room during dehumidification. When a low limit is reached, a compressor or the liquid cooling source that is used for dehumidification is disabled. It is re-enabled when the air temperature rises. The Low Limit 1 and 2 settings are in the Service menu under Setpoints.
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Operation Tandem Digital Scroll Operation for Dehumidification When tandem digital scroll compressors are present, the activation and deactivation of dehumidification will be handled just as it would for conventional compressor operation. The rules described in this section apply only when dehumidification is active. Further, the activation or deactivation of compressors for certain alarm conditions, or Suction Pressure Management, take precedence over the rules described in the ensuing subsections.
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Operation Dehumidification Operation • Dehumidification with four compressors operates until there is a call for the first stage reheat. • Dehumidification with three compressors operates until there is a call for the second stage reheat or LL1 is reached • Dehumidification with two compressors is allowed to operate with full reheats until the LL2 threshold is met •...
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Operation Dehumidification with Two Compressors (DH Stage 1) • Compressors C1A and C2A must be On, while compressors C2B and C1B must be Off. • The C1A digital compressor must be loaded at 100% at all times. • The C2A digital compressor will adjust its loading based on whether the Call for Dehumidification is greater than the Call for Cooling: If the CFD is greater than or equal to the CFC, C2A must use the ramp on line DH05 (“C2A CFC @ 0% / 100% Dehum Ramp”) with the CFD used to determine ramp %.
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Operation Dehum Operation with One Compressor Out on Alarm This type of dehumidification operation will resemble DH Stage 2, except for the rules listed below. If the compressor with the alarm resides in Tandem Bank 1 (C1A or C1B)… • If Compressor 1B is out on alarm, operation will be identical to that of DH Stage 2, except that if the CFC goes above the value on line DH02, C1B will not be restarted.
This sensor can be added to existing Liebert iCOMs by purchasing the supply sensor and wiring harness. The supply air sensor must be connected to P13, Pins 1 and 2. Contact your local Emerson representative for pricing and installation.
The supply sensor should be located 5-15 ft. (1.5-4.5m) from the unit to provide an accurate reading for the control. A 50 ft. (15m) extension cable is available from Emerson if the sensor must be farther than 15 ft. (4.5m) from the Liebert iCOM (P/N 186978G5).
Operation Figure 32 Return Compensation in Unit View Return Compensation in Unit View Figure 33 Return Compensation control band S115 Return Compensation Value Temperature Setpoint (Sensor set to either Supply Sensor New air temperature or Remote Sensor ) setpoint modified by compensation -100% S115 Return...
Operation The return compensation setpoint will proportionally increase as the return temperature deviates below S114 “Return Compensation Setpoint.” The compensation proportional band is set on line S115. The compensating proportional band defines the maximum value the air temperature setpoint will increase during return compensation.
Operation When supply air compensation has been invoked, it will be indicated on the unit view by a small downward-pointing arrow. See Figure 36. Figure 36 Supply Compensation in Unit View Supply Compensation in Unit View During normal operation, as the rack temperature increases above the fan temperature setpoint, the fan speed will increase until it reaches 100% speed.
Liebert DSE—Basic Control System Overview The Liebert DSE with Liebert EconoPhase system includes three primary control systems: • Liebert DSE (Indoor unit)—Contains the Liebert iCOM control board, large Liebert iCOM display, compressors, reheat, humidifier, evaporator fans and evaporator coil and electronic expansion valves.
Operation ™ CANbus Connections Between the Liebert DSE, Liebert EconoPhase and Liebert ™ Communication between the Liebert DSE, Liebert EconoPhase and Liebert MC condenser is achieved using a terminal screw CANbus connection. CANbus (Controller Area Network bus) communication to each device is wired as a daisy chain using a shielded, twisted pair cable. The guidelines below must be followed to ensure reliable communication.
The Liebert DSE can be equipped with an optional pumped refrigerant Liebert EconoPhase to reduce power used for cooling when the outside air is cool enough. All components that help to drive its efficiency are automatically controlled with the Liebert iCOM and do not need to be adjusted in the field. 3.8.3 Electronic Expansion Valve (EEV) The Liebert DSE controls superheat with an electronic expansion valve (EEV).
The Liebert iCOM monitors battery life by performing periodic tests using the electronic expansion valve board. If a test fails, the Liebert iCOM will report an EEV1 or 2 BATTERY WARNING or EEV1 or 2 BATTERY FAILURE event.
Fan reversal interval should be programmed at times when the unit is off (monitoring off, standby or Remote Shut Down (RSD)). Liebert iCOM (apart from the configuration and status screens) has to perform two timer activities: • Low noise during programmed days / time (common for dual Liebert MC boards).
Operation U816 Reversal Duration—Selection defines the length of time the fan(s) will be operated in reverse. This parameter is adjustable from 0-999 seconds. The default set value is 60 seconds. U817 Reverse Fans Now—Selection performs a rotation when parameter is set to “YES.” When selection is set to “YES,”...
Operation When the Liebert DSE is operating in EconoPhase Mode, the Liebert iCOM display will provide a unit level display that shows the status of the refrigeration circuit. Other system and unit level screens can be accessed through the Liebert iCOM.
Operation The parameters below can be found in the Liebert iCOM under User > Econophase. Table 11 Liebert EconoPhase operation states Data Point Description Pump 1 operational state Pump 1 running status, 1 = ON Pump 2 operational state Pump 1 Run Hours...
• Communication with the EEV control board established Once the conditions above are satisfied, the Liebert iCOM will determine whether the outdoor dry bulb conditions are low enough to provide enough cooling to maintain the indoor room load. Dry bulb conditions must be either: •...
Service menu under Alarm Setup is set to Yes. The default setting is Yes. • Alarm: When an alarm is received, a red light on the Liebert iCOM will blink and an alarm will sound, unless turned Off in the User Display Setup Menu. Pressing the alarm button will acknowledge the alarm but not clear the alarm.
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Operation Table 12 Possible event settings—events listed may vary by specific unit and options order Internal Delay Default Delay / Selectable Type Event (Before Action Occurs) (Before Action Occurs) (default) MAIN FAN OVERLOAD 2 seconds 5 seconds / 0 – 9999 * LOSS OF AIRFLOW 3 seconds 3 seconds / 0 –...
Alarms specific to Liebert MC condenser Event Description The Liebert iCOM board cannot establish communication with the Liebert MC Board for 10 seconds consecutively, the “GCx Disconnected” alarm will be GC 1 or 2 Disconnected annunciated for the corresponding circuit. No further action is taken by the Liebert iCOM.
An unrecoverable fatal system error has occurred. Pump shut down. Pump board must be PB1 BOARD FAIL rebooted to reset event. Pump has cavitated and was shut down. Event is reset when the Liebert iCOM requests a PB1 CAVITATE SHUTDOWN new startup.
Operation Table 15 Alarms specific to the EEV Event Description This event is triggered if the iCOM control looses communication with the EEV EEV 1 or 2 Communication Error board. The compressor(s) will shut off and the unit will exit EconoPhase while the error is active.
Operation Table 16 Customer inputs Setting Reaction Smoke Event Only Water Alarm Event Only C PMP Alarm Event Only Flow Alarm Event Only Stdby G Pmp Event Only Stdby Unit Event Only C-Input 1 Event Only C-Input 2 Event Only C-Input 3 Event Only C-Input 4...
3.9.3 Analog Inputs The Liebert iCOM allows an external sensor or analog device to be connected, scaled and viewed. See Table 17 for output availability by unit type. These external devices require optional analog input connections that can be installed on new units at the factory or added to existing units in the field.
3.9.4 Liebert iCOM-DO The Liebert iCOM-DO is an optional discrete output relay card that can be connected to a Liebert iCOM for providing dry alarm contact outputs for monitoring systems. The Liebert iCOM-DO is a direct replacement of the Liebert ENV-DO card that was supported on previous Liebert control ™...
Table 20 lists examples of alarms and warnings that can be configured for a cooling unit. When any of these occur, they will appear on the Liebert iCOM Status menu and will be recorded in the Liebert iCOM Event log.
CIRCUIT 1 LOW PRESS — CIRCUIT 2 LOW PRESS — Communications between EEV and the Liebert iCOM control board cannot be EEV COMMUNICATION ERROR established. Check CANbus cable to EEV. Sensor is either disconnected or has failed. Check connection from all sensors EEV SENSOR ERROR to EEV board.
Line S008 will update to show the next calculated maintenance date. Liebert iCOM keeps tabs on the condition of a cooling unit, determining its wellness and projecting when service will be needed, for the entire unit as well as for individual components. This assists in scheduling maintenance calls and helps pinpoint components likely to require service.
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To calculate wellness, Liebert iCOM keeps a running total of component working hours and the number of times it has been started. Liebert iCOM relates that data to the optimum/maximum starts per hour. Accordingly, Liebert iCOM will increase or decrease the time before the next service call.
• No Teamwork • Teamwork Mode 1—Not available on Liebert DSE units • Teamwork Mode 2 • Teamwork Mode 3 All Liebert iCOM-controlled cooling units on a network must be set to run in the same teamwork mode. ® ®...
In raised floor applications, Liebert iCOM units will share sensor information to achieve even under-floor air distribution. This distribution is achieved by operating all fans in parallel, which will also yield the greatest energy efficiency.
The fan speed is controlled by the remote rack sensors of all units, providing a controlled delivery method of the air to the cold aisle. In raised floor applications, Liebert iCOM units will share sensor information to achieve even under-floor air distribution. This distribution is achieved by operating all fans in parallel, which will also yield the greatest energy efficiency.
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The first and possibly most common failure scenario is a single unit or component failure. In this situation, the Liebert iCOM will automatically activate a standby unit in the place of the failed unit.
Hardware Setup The Liebert Optimized Aisle Control requires: • A temperature/humidity sensor in the cold aisle and connected to the Liebert iCOM via CANbus. This can be done by: • Moving the return temperature sensor from the cooling unit to the cold aisle with a longer CANbus cable —OR BY—...
Teamwork 4.3.1 Tools Required for Installation • Small, non-conductive tool for setting control DIP switches • Medium flat-head screw driver for opening electric panel protective dead-front. • Cutting tool to trim cable ties • Small Phillips-head screwdriver to open 2T housing 4.3.2 DIP Switch Settings The individual 2T rack sensor must be given a unique address on the CANbus cable run to the...
2T Sensors do not need to be addressed in numerical order. For example, if four sensors are purchased, they can be connected as shown in Figure 55. Figure 55 2T sensor arrangement and termination Liebert iCOM Sensor #2 Sensor #3...
Teamwork Terminating Last 2T Sensor The last 2T sensor on the network, which can be identified by only having one CAN cable plugged into it, must be terminated. All other 2T sensors on the network must remain unterminated. The following pictures show the location of the jumper that determines if the 2T sensor is terminated.
The incoming CANbus cable from the first 2T sensor in the daisy chain is landed on the rear of the Liebert iCOM display. The factory installed CANbus cable from the rear of the display to the main board in the electrical panel does not included a ground feature and must be replaced with a 6' (1.8m) grounded CANbus cable.
Unit Off mode. Some internal components require and receive power even during the Unit Off mode of the Liebert iCOM control. The factory-supplied optional disconnect switch is inside the unit. The line side of this switch contains live high voltage.
3. Determine the appropriate setting for SB03 Unit Remote Sensor Mode/AVG incl. The values set here will determine how the Liebert iCOM monitors inlet rack temperature to control the fans. Max: controls fan(s) based on the maximum rack temperature.
Teamwork 4.3.8 Standby—Rotation Typical Standby (Lead/Lag) Function This function can be performed in any teamwork mode, including NO Teamwork. One or more units can be defined to be Standby; the normal status of standby units is Standby Off (fan off). In case one regular unit has an alarm that is defined (to be defined in the alarm configuration), to switch on a standby unit, the faulty unit will switch off and the standby unit will switch On.
IEBERT I ETWORK Connecting multiple Liebert iCOM-controlled cooling units in an Ethernet Unit-to-Unit (U2U) network enables the units to work together to achieve efficient cooling and humidity control of the conditioned space. Networking enables setting up the cooling units to exchange data for various modes of operation: •...
• 10/100 Mbps speed • Multiple 10/100 RJ-45 ports—one shared; RJ-45 Uplink port ™ The Liebert vNSA is an approved powered network switch designed to support Liebert iCOM U2U ™ networks. See Liebert vNSA on page 88 for details. ®...
(failed network switch, etc.), all Liebert iCOM-controlled cooling units will continue to operate as independent units. The Liebert iCOM can support up to 64 nodes on one network. An input/output board, large display, and large wall-mount display are each considered one node. Of the 64 nodes that may be connected, no more than 32 may be input/output boards (32 cooling units).
Each cooling unit with a large display requires two straight-through Ethernet cables from a network switch. One cable connects to port P64 on the Liebert iCOM input/output board and the other straight-through cable connects to the female-female coupler, if the female-to-female coupler is provided with the unit.
Installing a Liebert iCOM Unit-to-Unit Network Wall-Mount Large Display Only large displays can be used for remotely monitoring and controlling cooling units connected on the same network. Each wall-mount large display requires 120VAC or 230VAC input power; Emerson provides an AC adapter wall plug. A straight-through Ethernet cable must be connected ®...
Installing a Liebert iCOM Unit-to-Unit Network ™ Liebert vNSA The Liebert vNSA is designed to connect multiple Liebert iCOMs. The Liebert vNSA contains either one or two powered industrial rail switches. An optional remote large display can be attached to the front door as well.
Liebert SiteLink-E for monitoring and management. The Liebert IS-485EXI is compatible with all Liebert iCOM software versions. See the Liebert Web site for the latest supported protocols, monitoring reference information and SNMP MIBs: www.liebert.com...
The User menu parameter tables in this manual may differ from the display on your cooling unit. The Liebert iCOM functions with several Liebert cooling units, each with its own set of control commands. In addition, the Liebert iCOM firmware is being updated constantly. As a result, the User menu parameter tables in this manual may differ from the display on your cooling unit.
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Dew Point allows Liebert iCOM to calculate the actual dew point of the room and to control the humidity based on a user-entered dew point temperature. The range is Relative, Absolute, Predictive and Dew Point.
User Menu Parameters Figure 65 Setpoints screen, page 2 U113 2nd Temperature Setpoint—Provides a way to program an alternate temperature setpoint that is activated by a dry contact through the customer inputs connections. When a customer input connection is set to “2nd Setpoint” and the input is wired to that input is active, then the value set in this parameter sets the active temperature setpoint.
16 days are available. Figure 66 Graphs, page 1 There are two line trend graphs in Liebert iCOM. The upper graph displays temperature data and the lower graph displays humidity data. Each graph can be customized by changing the span of time and the range of the sensor readings.
Once the event log reaches 400 events, the oldest events are erased as new events are stored. View Network View Network—The view network screen provides an overview of the Liebert iCOM network and a status of each unit. This screen will provide the unique unit name given to the unit. If no name is given, then only the unit number will be displayed.
User Menu Parameters U206 Low Return Humidity—Allows a user to adjust the point at which the actual return humidity activates a Low Humidity Alarm. This parameter is adjustable from 1% to 99%. The default setting is 40%F. U207 Sensor A Alarms—Enables or disables the alarms for reference Sensor A. When enabled, the Sensor A temperature and humidity values will be compared to a high and low setting.
User Menu Parameters Figure 70 Set alarms screen, page 3 U224-U233 High/Low Remote 01 - 10— Sets the High and Low remote temperature sensor alarm points individually for each sensor when the parameter separate thresholds is set to disabled. The range for both parameters is 34°F to 210°F.
Liebert iCOM controller area network (CAN) bus. A reference sensor can be connected to any type of Liebert iCOM unit. Sensor A can only be used as a reference sensor for reading and monitoring but not for control purposes. Sensor A is selected by setting the DIP switches on the temperature and humidity board.
Liebert iCOM unit. When an optional temperature and humidity or the optional 2T sensor is connected and set as Sensor B, then its value will be displayed on this line. Liebert iCOM will auto detect what type of sensor is connected. Sensor B can only be used as a reference sensor for reading and monitoring but not for control purposes.
User Menu Parameters U313 Daily High Temperature—The highest recorded temperature from the temperature controlling sensor between the hours of 12:00 a.m. to 11:59 p.m. U314 Daily Low Temperature—The lowest recorded temperature from the temperature controlling sensor between the hours of 12:00 a.m. to 11:59 p.m. U315 Daily High Humidity—The highest recorded humidity from the temperature controlling sensor between the hours of 12:00 a.m.
These parameters show the analog input configured device and the value from the device that is connected to the Liebert iCOM control. Refer to the Figures 138 through 142 for a list of analog input devices. The analog input device is setup in the Service menu and could consist of the following devices: Air Pressure, Pressure, Temperature or Percent.
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User Menu Parameters U402 Date—Sets the internal date of the unit. If this unit is connected to other units with the unit to unit network connection, all units will reflect the last date set. U403 Time—Sets the internal time of the unit. If this unit is connected to other units with the unit to unit network connection, all units will reflect the last time set.
User Menu Parameters User-Total Run Hours Menu Screens Total Run Hours displays the cumulative hours a particular component has been operating and the limit placed on the hours the component may operate. Each main component of the unit has its own run hours counter and a threshold. The actual run hours can be reset to 0 by selecting the counter by pressing Enter, and then pressing the Down arrow key.
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User Menu Parameters U609 Timer Reset—Defines when the unit changes back to Sleep Mode after having crossed the high or low temp threshold (Deadband setting on line U611). These values are available: • NO: The user can use this setting to temporary interrupt a sleep mode interval while sleep mode is active.
User Menu Parameters User-Condenser Timer Menu Screens The Condenser Timer menu applies to Liebert units coupled to a Liebert MC outdoor condenser ™ connected through CANbus communication. Figure 79 Condenser Timer screen—page 1 U802 Low Noise Timer Enabled—Sets the low noise operations of the condenser fan. When the parameter is set to “YES”...
User Menu Parameters Figure 80 Condenser timer screen—page 2 U813 Select Condenser 2—This menu selection toggles between condenser 1 and 2. When “Select Condenser 2” is shown the data below is for condenser 1. When “Select Condenser 1” is shown, the data below is for Condenser 2.
Service menus allow customized settings for site operations. The password for service menu parameters is 5010. The Liebert iCOM firmware is being updated constantly. As a result, the Service menu parameter tables shown in this manual may be slightly different than what is shown on your cooling unit's display.
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Service Menu Parameters compressors can only be set to Return or Remote control type l. This parameter can only be changed in the service menu. The range is Supply, Return or Remote Sensor. The default setting is Return. S103 Temperature Setpoint Act/Set—Selects a return temperature that the cooling unit will maintain by applying cooling and or reheats.
Service Menu Parameters Figure 83 Setpoints screen, page 2 of 9 S113 Enable Temp Compensation—Temperature compensation allows for a second or third sensor to be used that will influence the unit’s cooling or heating. Three selectable values are available: Return, Supply, and Ret + Sup (Return plus Supply). See 3.6 - Supply Control for more information. S114 Return Compensation Setpoint—The temperature setpoint where compensation begins to operate by increasing the supply air setpoint.
Service Menu Parameters Figure 84 Setpoints screen, page 3 of 9 NOTE When the unit is in relative humidity control, only the right side of the menu is displayed and dew point will display the left side of the menu. S124 Humidity Control Sensor—Defines which humidity value the humidity setpoint is compared with.
Service Menu Parameters S132 Dehum Reheat/LL Sensor/Set—Sets the sensor and temperature start point that the reheat will be deactivated and dehumidification will be stopped due to overcooling the space in a call for dehumidification. S133 Dehum Low Limit 1 LL1/LL2—Dehum Low Limit 1; Dehum Low Limit 2. S134 Dehum Reheat Prop Band2—Sets the reheat proportional band for reheat operation independently of the temperature proportional band.
Service Menu Parameters S141 Lockout FC at FC Fluid below—Prevents frost from building up on the free-cooling pipes when the outdoor ambient is extremely low by turning Off the free-cooling circuit when the water temperature is too low. Figure 86 Setpoints screen, page 5 of 9 S146 Fan Control Sensor—Controls the fan speed for modulation.
Service Menu Parameters S153 Fanspeed Dehum/No Power—Sets the fan speed when a call for dehumidification is active. This allows the units fan speed to be ramped lower to help with any overcooling due to the dehumidification process. This also allows the coil to remove additional moisture even faster. S154 Allow Fan Modulation on Comp—Provides the option to set the fan to fixed speed if the unit is equipped with compressors.
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Service Menu Parameters S160 Fanspeed Reposition Mode/Delay Decel/—This parameter should only be adjusted by a factory service trained technician. The fan speed reposition mode / delay is a one time delay as the fan speed is requested to change direction. This delay will be applied only when the fan speed is commanded from an increasing to decreasing state or a decreasing to increasing state.
Some internal components of Liebert cooling units require and receive power even during the Unit Off mode of the Liebert iCOM. The factory-supplied optional disconnect switch is inside the Liebert cooling unit. The line side of this switch contains live high voltage.
S185 2nd Compressor Stop Delay—Sets the delay when the stop compressor setpoint for the second compressor is met. S186 Cycle Time—Set at the factory and should be changed only by an authorized Emerson representative. S187 SCR Factor—Set at the factory and should be changed only by an authorized Emerson representative.
Service Menu Parameters Figure 90 Setpoints screen, page 9 of 9 S190 Static Pressure Fan Control—Enables or Disables the use of static pressure control for fan modulation. This parameter is selectable between Disabled and Enabled. The default is Disabled. S191 SP Setpoint—Sets the static pressure setpoint to be used by the control to modulate fan control.
Service—Unit Diary Menu Screens (Large Display Only) Unit Diary—Shows all entered program changes and maintenance performed on the unit. The Unit Diary serves as a note pad, where information can be added through the Liebert iCOM Service Tool. Service—Standby Settings / Lead Lag Menu Screen Standby Settings / Lead Lag allows the user program lead-lag setup when units are connected in a Liebert iCOM U2U network.
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Service Menu Parameters S508 Cascade Units—Allows units to activate in Standby mode if the room temperature cannot be maintained by the non-standby units. If “Yes” is selected, the cascaded units can perform all functions when activated from standby. This parameter can also be set for Cooling Only or Cool / Heat / Fan (available in TW3 only).
S008 Calculated Next Maintenance—Provides a date to when the next expected maintenance should take place based on the last confirmed PM, component starts, run hours and the penalty / bonus currently set in the Liebert iCOM. ® ®...
S31A EEV Batt Fail Counter C1 / C2—The Liebert iCOM monitors battery life with periodic tests using the electronic expansion valve board. If a battery fails a test, the Liebert iCOM control reports an EEV# (#= 1 or 2) BATTERY WARNING or EEV# (#= 1 or 2) BATTERY FAILURE event. This parameter acts as a counter.
The information in the Diagnostics > Service Mode, page 2 of 8, will vary according to the compressor type installed. S313 Manual Mode—Places the Liebert iCOM in manual mode. This is the initial setting necessary to activate any of the following items.
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Service Menu Parameters S317 Compressor 1 Capacity—Standard compressor models. Selects the capacity the compressor should run at. The range is 20 to 100%. S317 Compressor 1A Capacity—Tandem compressor models. Selects the capacity the compressor should run at. The range is 20 to 100%. S318 Compressor 1 Cycle Ramp—Standard compressor models.
Service Menu Parameters Figure 103 Diagnostics/service mode screen, page 3 of 8 S324 Electric Heat 1 (or HG/HW)—Activates Stage 1 of the unit’s reheat system. S325 Electric Heat 2 (or HG/HW)—Activates Stage 2 of the unit’s reheat system. S326 Electric Heat 3 (or HG/HW)—Activates Stage 3 of the unit’s reheat system. S327 SCR Heat—Specifies the pulse width the heating system should run at on units using silicon controlled rectifier type reheat.
When the ball valve control is set to Manual, the motorized ball valve position will be maintained as set. Emerson recommends against manually setting the motorized ball valve’s during compressor operation because it might cause the compressor to trip on its high- or low-pressure protection controls.
Service Menu Parameters Figure 105 Diagnostics/service mode screen, page 5 of 8 Status Remote Shutdown—Shows the status of the unit’s remote shut down input. S346 Status Airflow Loss—Shows the status of the unit’s air proof switch. S347 Status Motor Overload / EC Fan Fault—Shows the status of the unit’s main fan overload or EC fan fault input.
Service Menu Parameters Figure 106 Diagnostics/service mode screen, page 6 of 8 S356 Status HP1—Shows the status of the unit’s compressor 1 high pressure switch input. S357 Status LP1—Shows the status of the unit’s compressor 1 low pressure switch input. S358 Status C1 OL—Shows the status of the unit’s compressor 1 overload input.
• A feedback signal from the valve that is required for Supply Air Control. The feedback signal constantly provides the Liebert iCOM with the valve’s position, eliminating the need to reset the valve(s) on a loss of power and provides a valve failure detection.
Service Menu Parameters Service-Set Alarms Menu Screens Set Alarms allows the user to view and modify critical alarm thresholds, time delays, enable/disable alarms, modify event types and program custom alarm inputs. Figure 109 Set alarms screen, page 1 of 12 S202 Return Sensor Alarms—Enables and disables the return temperature and humidity sensor alarms.
Service Menu Parameters Figure 110 Set alarms screen, page 2 of 12 S213 SUP Sensor Alarms/Init Delay—The parameter to the left enables or disables the supply sensor alarms. If the unit is not equipped with a supply temperature sensor, then this parameter will show Disabled.
Service Menu Parameters Figure 111 Set alarms screen, page 3 of 12 S224 Customer Input 1, 2, 3 & 4—Select the device and operation of the customer inputs. Each event reflects a different alarm and possible action to the unit. Refer to Table 12 for a description of selectable options.
™ —Shows the connection status of a Liebert iCOM-DO card. It displays “connected” when a Liebert iCOM-DO card has been set up and connected to the Liebert iCOM via the controller area network (CAN) bus. S725 Override—Permits manual testing the Liebert iCOM-DO by activating each output on the following screen.
. Each event description may reflect a status or alarm, depending on the line. • ID—Displays the number of the Liebert iCOM-DO. Currently only one Liebert iCOM-DO card is supported. The ID must match the S721 to function. • Output #—Shows which output is tied to a particular alarm. The default values are set to be the same output as the Liebert ENV-DO card, the predecessor to the Liebert iCOM-DO.
Tandem Compressor Screen (Compressor 1 & 2B temperature calibration through Liebert iCOM is not currently supported) S602 Return Temperature—Adjusts the return temperature reading from the actual sensor to compensate for any error of the sensor or to match other sensors in the room.
Service Menu Parameters Figure 125 Sensor calibration/setup screen, page 2 of 7 Optional Sensor A and B—Adjusts the reading from the actual sensor to compensate for any error of the sensor or to match other sensors in the room. Calibrated Optional Sensor A and B—Shows the adjusted value of the sensor. This value is the actual sensor reading (+ or -) the offset.
Service Menu Parameters S628 Supply/Return Sensor—Adjusts the supply temperature reading from the actual sensor to compensate for any sensor error or to match other sensors in the room. S629 Calibrated Supply Sensor—Shows the adjusted temperature value of the supply sensor. This value is the actual sensor reading (+ or -) the offset “Supply Sensor”.
Service Menu Parameters Figure 128 Sensor calibration/setup screen, page 5 of 7 Figure 129 Sensor calibration/setup screen, page 6 of 7 S657 DP Transducer is Connected to—Sets the analog input that will be used for the differential pressure transducer. This parameter is selectable from None, Ana In 1, Ana In 2, Ana In 3 and Ana In 4.
Service Menu Parameters S664 Results:—Read-only string that describes S665 through S668. S665 DP Transducer Low—Shows the status of the low differential pressure transducer in both inWC and Pa after it’s setup at S659. S666 DP Transducer High—Shows the status of the high differential pressure transducer in both inWC and Pa after it's setup at S660.
(i.e., Return / Supply Sensor) • Yes: This parameter will operate the Liebert Air Economizer based on the outdoor sensor reading and will allow the Liebert iCOM to determine if the conditions are within the acceptable range of operation.
Service Menu Parameters Figure 132 Economizer, page 2 of 3 SA13 Local Outdoor Air Temperature—Actual outdoor temperature from the sensor connected to the unit. SA14 Local Outdoor Air Humidity—Actual outdoor humidity from the sensor connected to the unit. SA15 Outdoor Sensor C Connected—The default selection for units without air economizer is No. The default selection for unit with air economizer is Yes.
Service Menu Parameters Figure 133 Economizer, page 3 of 3 SA24 - Return Damper Open—Sets the open voltage. This parameter may be set from 0V to 10.0V. The default is 2.0V. SA25 - Return Damper Closed—Sets the closed voltage. This parameter may be set from 0V to 10.0V.
S810 Network Safe—Saves or loads network settings for the display that have been modified from the defaults to an internal file that can be downloaded/uploaded using the Liebert iCOM Service Tool. Selecting “Save” will write the settings to the internal storage file. Selecting “Load” will write the settings from the internal storage file to the application software.
Service Menu Parameters Figure 135 System/network setup screen—System, page 2 of 2 (large display only) S813 IP Address—Contains the network address of the display. This address must be unique on the network. S814 Netmask— Netmask is used to divide IP addresses in subnet and specify the network available to hosts.
S825 Monitoring Timeout/Handshake—Can be used with a building management system to verify communication has not been lost between the Liebert iCOM control and the BMS. If the time specified in this parameter elapses before the BMS writes a new value, then an alarm will occur “BMS TIMEOUT”...
Service Menu Parameters Figure 137 System/network setup screen—Unit, page 2 of 2 S835 Monitoring Protocol—Selects the monitoring protocol. Velocity V4 is the default that will provide communication to the Liebert IntelliSlot housing. Liebert Hironet is used only on Liebert ® ™...
This parameter is set at the factory based on the unit’s model number. S407 LWD Connected—This parameter is set to “Yes” if a liquid detection device is connected to the Liebert iCOM. S408 Valve Type—Displays the type of valve actuator installed, either chilled water or free-cooling.
On to reduce the amount of simultaneous power consumption after a loss of power. S422 On-Off Enabled—Sets the Liebert iCOM control to ignore the On/Off command from the display On/Off button when set to NO. This parameter is a local setting in the control board.
Service Menu Parameters Figure 140 Options setup, page 3 of 6 S424 CW Flush—Selects the number of hours between each chill water coil flush cycle. The default is every 24 hours. Reducing this number will increase the number of coil flushes. S425 Freecooling Flush—Selects how many hours between each free-cooling coil flush cycle.
Service Menu Parameters Figure 141 Options setup, page 4 of 6 S435 Measure Type—Determines the measurement units and range for each analog input. Factory Std measurement type means the input is being used by the factory-configured device for unit control and cannot be set to any other measurement type. Not Config measurement type means the input is available for custom sensor use, but has not been configured.
Service Menu Parameters Figure 142 Options setup, page 5 of 6 Only characteristics for analog inputs used for custom sensors are visible in this menu. Start Points (S446, S448, S450 and S452)—Represent the starting point of each analog input’s linear characteristic. The column on the left indicates the desired readout at the lowest allowable sensor voltage, and the column on the right indicates the lowest sensor voltage.
Service Menu Parameters Figure 143 Options setup, page 6 of 6 S457 Q15 Output Function—Sets the output function for Q15. This parameter is selectable for 0 = None, 1 = Dehum On, 2 = Cooling On, 3 = Reheat On, 4 = Comp On, 5 = Comp 1 On, 6 = Comp 2 On, 7 = Humi On, 8 = Fan On, 9 = FreeCool On, 10 = Damper, 11 = High Temp, 12 = Low Temp, 13 = Loss Power and 14 = Power Source The default setting is none.
Service Menu Parameters 8.12 Service-Service Contact Info Menu Screens Service Contact Info contains the service contact phone number, e-mail address, pager number and Web site to be entered in this screen. Table 25 Service contact information parameters Function Range Large Display Imperial (metric) Page 1 of 1 Password...
Service Menu Parameters 8.13 Service-Remote Sensors Menu Screens Remote Sensors provides remote sensor setup and readings. Figure 144 Remote sensors Number of sensors used to calculate average; hidden when Maximum is selected Node Setup Individual Sensor Reading Sensor Sensor SB02 programming determines Node Name the temperature displayed.
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Service Menu Parameters Notes ® ® ™ Liebert iCOM for Liebert DSE...
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Service Menu Parameters ® ® ™ Liebert iCOM for Liebert DSE...
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