Page 3 - TABLE OF CONTENTS; GLYCOOL
i TABLE OF CONTENTS 1.0 I NTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1....
Page 4 - ii
ii 4.4 Main Menu (AG)—View/Set Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.1 Active Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.2 Alarm History Lo...
Page 5 - iii
iii 5.0 R ESPONSE BY C ONTROL T YPE —A DVANCED M ICROPROCESSOR C ONTROLS . . . . . . . . . . . 33 5.1 Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.1.1 Cooling/Heating Required, in Percent (%) . . . . . . . . ...
Page 6 - iv
iv 7.0 C OMPONENT O PERATION AND M AINTENANCE , C HECKS AND A DJUSTMENTS . . . . . . . . . . . . 48 7.1 System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.1.1 Environmental Control Functions . . . . . . . . . . ...
Page 9 - Introduction; NTRODUCTION; System Description
Introduction 1 1.0 I NTRODUCTION 1.1 System Description Liebert Deluxe environmental control systems are available in several configurations. Each configu- ration can operate with either Advanced Microprocessor Controls (AM), or Advanced Microprocessor Controls with Graphics (AG). A brief descriptio...
Page 11 - Initial Start-Up Procedure; NITIAL; breakers, open them instead of removing fuses.; Microprocessor Controls Setup; or to; Advanced Microprocessor with Graphics Control; Additional Considerations for Upflow Units; Consult Liebert Applications Engineering for more information.; WARNING
Initial Start-Up Procedure 3 2.0 I NITIAL S TART -U P P ROCEDURE Before beginning start-up, make certain that unit was installed according to the instructions in the Installation Manual. All exterior panels must be in place.Locate the Start-Up form supplied with your unit documents. Complete the for...
Page 12 - Advanced Microprocessor Controls Setup; DVANCED; section. For more control details refer to; cessor Controls; , and for more alarm information refer to; tions; Basics; . These keys are used to move through the menus as prompted on; Figure 2; displayed and may require a password, if enabled.; Figure 1; Display the Main Menu—AM Control
Advanced Microprocessor Controls Setup 4 3.0 A DVANCED M ICROPROCESSOR C ONTROLS S ETUP The Advanced Microprocessor (AM) Control for your Liebert Deluxe unit features an easy to use menu driven LCD display. The menus, control features, and circuit board details are described in this section. For mor...
Page 14 - testing. Check the unit delivery date to see if this is the case.; NOTE
Advanced Microprocessor Controls Setup 6 3.3 Main Menu (AM)—Status/Alarm Data Selecting STATUS/ALARM DATA from the Main Menu will display the following selections: ACTIVE ALARMSOPERATING STATUSALARM HISTORY LOGRUN HOURS LOGANALOG SENSORS 3.3.1 Active Alarms This screen, a submenu of Status/Alarm Dat...
Page 15 - Analog; Setpoint
Advanced Microprocessor Controls Setup 7 3.3.5 Analog Sensors The four (4) analog sensor inputs can be monitored from this submenu of Status/Alarm Data. The inputs are filtered and displayed along with the text label assigned during setup. See Analog Setup on page 12 . 3.4 Main Menu (AM)—Setpoints/S...
Page 16 - Setup Operation; IR Fill Rate; This feature will flush the respective coil for three; Table 2; Function; Cold Start Time Delay*
Advanced Microprocessor Controls Setup 8 Setup Operation The Setup Operation permits the review and/or adjustment of the unit configuration. The menu may include: Cold Start: This feature, also referred to as Positive Start or Winter Start Kit, allows for the low- pressure switch to be ignored for t...
Page 17 - Select Options; password feature if set to OFF.; Table 3
Advanced Microprocessor Controls Setup 9 Select Options The following table lists choices on the Select Options menu. These should match the options installed with your unit and should not need to change during normal operation. Calibrate Sensors The temperature and humidity sensors can be calibrate...
Page 18 - Dehumidification with Normal or Delayed Reheat:; Select Control Type; INTELLIGENT; - Response by Control Type—Advanced Microprocessor Controls; Setup Alarms; CAUTION
Advanced Microprocessor Controls Setup 10 Dehumidification with Normal or Delayed Reheat: Dehumidification with normal reheat allows for operating BOTH compressors and reheats simultaneously. It is very important that electrical ser- vice to the unit be sized and wired for this option if selected. W...
Page 19 - you can create your own message.; Standard Alarm; Alarm
Advanced Microprocessor Controls Setup 11 Enable Alarms: Each individual alarm can be selected to be ENABLED (annunciated audibly, visu- ally, and communicated to a Site Products System) or DISABLED (ignored). Enable Common Alarm: Each individual alarm can be selected to energize or to not energize ...
Page 20 - Standard Alarm Messages; For more information concerning alarms, see; Humidity Control Method; For installation of analog sensors, see; sor Controls; itor the sensor as follows:
Advanced Microprocessor Controls Setup 12 Standard Alarm Messages • Water under floor• Smoke detected• Standby GC pump on• Loss of water flow• Standby unit on For more information concerning alarms, see 6.0 - Alarm Descriptions and Solutions . Humidity Control Method The user may select between rela...
Page 21 - Set Status Display; Device
Advanced Microprocessor Controls Setup 13 Set Status Display The Status Display can be set to show the return air temperature and humidity SENSOR READ- INGS or the temperature and humidity control SETPOINTS through this selection. When SET- POINTS is selected, the status display indicates so by disp...
Page 22 - Test Outputs; protected by a battery backup.
Advanced Microprocessor Controls Setup 14 Test Outputs When this feature is selected, the unit is effectively turned off. When stepping from one load to the next, the previous load, if on, is turned off automatically. The loads can also be toggled on/off by selecting “ENTER”. Once turned on, the out...
Page 23 - displayed, pressing the MENU/ESC key returns to the Status Display.; Load Control Features; operating conditions have been met.; Control Circuit Board; configuration. The jumpers should be placed as follows:; The LED backlighting on the text (4 x 20) display is always lit.
Advanced Microprocessor Controls Setup 15 3.6 Main Menu (AM)—Status Display The Status Display shows the present room temperature, humidity, active status functions (cooling, heating, dehumidifying, humidifying), and active alarms. This is the data normally shown on the con- trol screen. If no key i...
Page 24 - the LCD display and are also described in more detail in; Communications; monitoring system you are using.; Liebert Site Product Device; toring system; Table 6; LED
Advanced Microprocessor Controls Setup 16 3.8.2 Nonvolatile Memory All critical information is stored in nonvolatile memory. Setpoints, setup parameters, and component run hours are kept inside the microcontroller in EEPROM. Information retained for the alarm history is kept in non-volatile RAM. 3.8...
Page 26 - Advanced Microprocessor with Graphics Control Setup; described in this section. For more details on the control refer to; Advanced Microprocessor Controls; for details on the alarms refer to; and Solutions; Figure 3; . These keys are used to move through the menus as prompted on the LCD; Figure 4
Advanced Microprocessor with Graphics Control Setup 18 4.0 A DVANCED M ICROPROCESSOR WITH G RAPHICS C ONTROL S ETUP The Advanced Microprocessor with Graphics (AG) Control for your Deluxe unit features an easy-to- use, menu-driven LCD Graphics Display. The menus, control features, and circuit board d...
Page 28 - Display the Main Menu—AG Control; shrinking water drop is shown next to the word “Dehumidification”.; See
Advanced Microprocessor with Graphics Control Setup 20 4.2 Display the Main Menu—AG Control Press the MENU/ESC key to display the Main Menu. The Menu selections include: • VIEW/SET ALARMS• OPERATING STATUS• VIEW/SET CONTROL SETPOINTS• SYSTEM SETUP• RUN DIAGNOSTICS• DATE AND TIME• PLOT GRAPHS• ANALOG...
Page 29 - Table 7
Advanced Microprocessor with Graphics Control Setup 21 4.4.3 Setup Alarms The list of alarms may be reviewed using the UP/DOWN keys. Any alarm may be selected to have its parameters modified by pressing the ENTER key. All alarms have a time delay and alarm type parameter. The high/low temperature an...
Page 30 - Selecting SETUP CUSTOM ALARMS will step to the following menu:; Standard Custom Alarm Mes-; Standard Custom Alarm Messages; Installation—LT750 DIP Switch Settings
Advanced Microprocessor with Graphics Control Setup 22 4.4.4 Set Up Custom Alarms Selecting SETUP CUSTOM ALARMS will step to the following menu: • SETUP CUSTOM ALARM TEXT• CHANGE CUSTOM TEXT 1• CHANGE CUSTOM TEXT 2• CHANGE CUSTOM TEXT 3• CHANGE CUSTOM TEXT 4 The custom alarm messages can be selected...
Page 31 - control is calling for the system to do.
Advanced Microprocessor with Graphics Control Setup 23 4.5 Main Menu (AG)—Operating Status The Operating Status is intended to provide the user with displayed information concerning what the control is calling for the system to do. For example: The display indicates the chilled water valve is 68% op...
Page 32 - Cold Start Delay; units. Typically, only air cooled units need a “Winter; Auto Restart Delay; for which they can be programmed.; Table 9
Advanced Microprocessor with Graphics Control Setup 24 4.7.1 Setup Operation The SETUP OPERATION menu permits the review and/or adjustment of the unit configuration. This may include: Cold Start Delay This feature, also referred to as Positive Start or Winter Start Kit, allows for the low pressure s...
Page 33 - will; PROPORTIONAL; Response by Control Type—Advanced Microprocessor Controls; Option
Advanced Microprocessor with Graphics Control Setup 25 4.7.2 Select Options The following table is a list of features that should match the options installed with your unit and should not need to change during normal operation. 4.7.3 Calibrate Sensors The temperature and humidity sensors can be cali...
Page 36 - Dehumidification with Normal or Delayed Reheat; The date and time are backed up by a battery.; Number
Advanced Microprocessor with Graphics Control Setup 28 4.8.4 DIP Switches The DIP switch settings can be reviewed from the display panel. Changing the DIP switches requires opening the front panel for access to the DIP switches on the microprocessor control board. These selections should match optio...
Page 37 - Slope
Advanced Microprocessor with Graphics Control Setup 29 Six different data types are recorded for graphing: temperature, humidity, and four user defined ana- log inputs. Each data type can be viewed over three different time scales and two different resolu- tions. The three time scales are 90 minutes...
Page 38 - or a custom text alarm. See; Load Control Features; Sequential Load Activation Control
Advanced Microprocessor with Graphics Control Setup 30 4.11.3 Read Digital Inputs The four custom alarm inputs can be defined to be digital inputs. Digital inputs are used to sense cus- tomer devices for status display purposes only and will not activate the audible alarm. 4.11.4 Set Up Digital Inpu...
Page 39 - Control Circuit Board; for other configurations
Advanced Microprocessor with Graphics Control Setup 31 4.13.3 Compressor Sequencing Control The lead compressor is the first one to be turned on when compressor operation is required. The lag compressor is turned on second if both compressors are required. The control monitors the operating time of ...
Page 40 - Proportional, Derivative and Integral Gains; Control output LEDs
Advanced Microprocessor with Graphics Control Setup 32 4.14.4 Control Outputs Active control outputs are indicated with LEDs on the lower section of the control board. Each LED is lit if the control output is active (on). Use these LEDs to assist in troubleshooting the system. 4.15 Communications Th...
Page 41 - rithm/control type selected in setting up the controls.; Temperature Control; Proportional Control; together three individual terms -; trol Features; Intelligent Control; would take if manually controlling the system (see; Intelligent Control on page 35
Response by Control Type—Advanced Microprocessor Controls 33 5.0 R ESPONSE BY C ONTROL T YPE —A DVANCED M ICROPROCESSOR C ONTROLS This section describes how your Advanced Microprocessor Controls respond depending on the algo- rithm/control type selected in setting up the controls. 5.1 Temperature Co...
Page 42 - When GLYCOOL; Dual Cooling Source; water temperature is 3; Chilled Water Cooling
Response by Control Type—Advanced Microprocessor Controls 34 5.1.3 Cooling Operation Two-Step Cooling, Compressorized Direct Expansion (DX) Systems The first stage of cooling activates when the temperature control calculates a requirement for cooling of 50%. The first stage of cooling is deactivated...
Page 43 - Humidity Control; Normal or Delayed Reheat (for Two-Stage Dehumidification Only); Switches
Response by Control Type—Advanced Microprocessor Controls 35 Hot Water/Steam Heat The valve begins to open when the requirement for heating is 33% and is proportionally adjusted until the valve is full open at 100% heat requirement. 5.2 Humidity Control 5.2.1 Dehumidification/Humidification Required...
Page 44 - Dual Cooling Source Dehumidification; dehumidification system.; Chilled Water Dehumidification; ment for dehumidification from 0 to 100%.; System Activation; inputs are the usual setpoint and sensitivity adjustments.; PID Control; sional retuning is required for optimum performance.
Response by Control Type—Advanced Microprocessor Controls 36 Dual Cooling Source Dehumidification When dual cooling is available, the humidity control will calculate a total dehumidification require- ment of 200% rather than 100%. The cooling valve opens proportionally as the requirement for dehu- m...
Page 45 - Suggested System Tuning Procedure; same amplitude from one peak to the next).; time between peaks x peak amplitude x 4
Response by Control Type—Advanced Microprocessor Controls 37 Suggested System Tuning Procedure 1. Initially adjust the integral and derivative settings to 0%/degree-min and 0%/degree/min.2. Starting with 20% /degree, adjust the proportional setting in small increments (10% steps) until the control s...
Page 46 - that are susceptible to mechanical wear or cycling.
Response by Control Type—Advanced Microprocessor Controls 38 Intelligent Control The Intelligent Control operates from a set of general rules that define how the control output should be adjusted for different system conditions. The rules are designed to duplicate the actions that an experienced hum...
Page 47 - Short Cycle alarm could occur.
Response by Control Type—Advanced Microprocessor Controls 39 5.3 Load Control Features 5.3.1 Short Cycle Control The control system monitors both compressors and prevents each from turning on within a 3 minute period of being turned off. If this (on, off, on) occurs too often, ten (10) times in a on...
Page 48 - Analog Sensors; the appropriate jumpers on the control circuit board. See; and; Figure 6; to the terminals as follows:; Figure 5; Terminal; Additional connections available after unit delivery; No jumper on; Analog input jumper location; ENLARGED AREA
Response by Control Type—Advanced Microprocessor Controls 40 5.4 Analog Sensors 5.4.1 Connecting the Analog Sensors The sensor inputs are factory-set to accept a 4 - 20 mA signal. The inputs can be changed by removing the appropriate jumpers on the control circuit board. See Table 13 , Figure 5 and ...
Page 49 - Physical Connections; for more information.
Response by Control Type—Advanced Microprocessor Controls 41 5.4.2 Water Detection Display The water detection display is designed to graphically display the location of water under a raised floor when connected to an LT750 water detection system. The graphical floor plan screen shows a 30 x 16 grid...
Page 50 - Calibration; position
Response by Control Type—Advanced Microprocessor Controls 42 Calibration Calibration should not be required for most installations. The accuracy of this display is approxi- mately 1%.The display is calibrated by the slope and intercept values of Analog Input #1. The position of the water is calculat...
Page 52 - Alarm Descriptions and Solutions; LARM; Setup Alarms on page 10; Standard Alarms
Alarm Descriptions and Solutions 44 6.0 A LARM D ESCRIPTIONS AND S OLUTIONS The Advanced Microprocessor (AM) and the Advanced Microprocessor with Graphics (AG) Control systems will audibly and visually annunciate all Enabled alarms, including the four (4) custom alarms. With the AM & AG Controls...
Page 53 - informed of the alarm function and corrective action required.; Infrared Humidifiers
Alarm Descriptions and Solutions 45 6.1.3 Custom Alarms (Only With Advanced Controls) Custom alarm messages are programmed at the LCD display. The alarms may be specified by the customer at the time of order. Additional devices and wiring may be required at the factory or by oth- ers. The message di...
Page 54 - nostics to make sure the humidifier system is working properly.
Alarm Descriptions and Solutions 46 6.1.10 Loss of Air Flow A differential air pressure switch is used to indicate loss of air flow in Deluxe units.Check for blockage of unit air outlet or inlet. Check blower motor fuses and overload reset. Check for broken belts. Make sure blower wheels are tight t...
Page 55 - Optional/Custom Alarms; or fire, and follow appropriate emergency procedures.
Alarm Descriptions and Solutions 47 6.2 Optional/Custom Alarms 6.2.1 Loss of Water Flow No water flow is detected in the chilled water or condenser water supply line. An optional flow switch is required for this alarm. Check for service valves closed, pumps not working, etc. 6.2.2 Smoke Detected Smo...
Page 56 - Component Operation and Maintenance, Checks and Adjustments; System Testing; done by temporarily changing the setpoints.; Cooling; come on. Disregard it. Return setpoint to the desired temperature.; Heating; return the setpoint to the desired temperature.; Humidification; On Chilled Water, GLYCOOL
Component Operation and Maintenance, Checks and Adjustments 48 7.0 C OMPONENT O PERATION AND M AINTENANCE , C HECKS AND A DJUSTMENTS 7.1 System Testing 7.1.1 Environmental Control Functions The performance of all control circuits can be tested by actuating each of the main functions. This is done by...
Page 57 - between terminals 1 and 2 at plug P39.
Component Operation and Maintenance, Checks and Adjustments 49 7.1.2 Electric Panel The electric panel should be inspected for any loose electrical connections. Control Transformer and Fuses The control system is divided into four (4) separate circuits. Fuses located on the transformer/fuse board in...
Page 58 - Filters; Consult the factory for more information.; determined and corrected before returning the unit to operation.; mounts will produce vibration that may damage the unit.
Component Operation and Maintenance, Checks and Adjustments 50 7.2 Filters Filters are usually the most neglected item in an environmental control system. To maintain efficient operation, they should be checked monthly and changed as required. Because replacement intervals vary with environmental co...
Page 59 - TURN OFF ALL POWER TO THE UNIT AT THE DISCONNECT.; programming of the variable speed drive parameters.; Refrigeration System; will absorb moisture.
Component Operation and Maintenance, Checks and Adjustments 51 7.3.3 Electronic Variable Speed Drive (Inverter) On large Deluxe chilled water models an optional variable speed drive inverter is available. This packaged unit is factory set and should not require field adjustments. The variable speed ...
Page 60 - sures are listed in the following table.; Operation; Suction pressures; System; Discharge pressures; System Design
Component Operation and Maintenance, Checks and Adjustments 52 7.4.2 Suction Pressure Suction pressure will vary with load conditions. The low pressure switch will shut the compressor down if suction pressure falls below the cut-out setting. On the other hand, high suction pressure reduces the abili...
Page 61 - expansion valve through the side outlet distributor (refer to; Figure 7; if a higher evaporator temperature is required.; Figure 7; for the new balance to take place.
Component Operation and Maintenance, Checks and Adjustments 53 Adjustment To adjust the superheat setting, proceed as follows:1. Remove the valve cap at the bottom of the valve.2. Turn the adjusting stem counterclockwise to lower the superheat.3. Turn the adjusting stem clockwise to increase the sup...
Page 62 - inspect all refrigerant lines for signs of oil leaks.; Figure 8
Component Operation and Maintenance, Checks and Adjustments 54 7.4.7 Air Cooled Condenser Restricted airflow through the condenser coil will reduce the operating efficiency of the unit and can result in high compressor head pressure and loss of cooling.Clean the condenser coil of all debris that wil...
Page 63 - Shell and Tube Condensers; to; Testing Function of Valve; ferent manufacturers.
Component Operation and Maintenance, Checks and Adjustments 55 7.4.8 Water/Glycol Cooled Condensers Shell and Tube Condensers Each water or glycol cooled module has a shell and tube condenser which consists of a shell, remov- able heads, gaskets and cleanable copper tubes.It may be necessary to clea...
Page 64 - Mechanical Failure; would cause a future failure.; long rubber gloves in handling contaminated parts.; under the terms of the warranty, and the WARRANTY WILL BE VOID.
Component Operation and Maintenance, Checks and Adjustments 56 7.4.9 Compressor Replacement Infrequently, a fault in the motor insulation may result in a motor burn. However, in a properly installed system, burnouts rarely occur. Of those that do, most are the effects of mechanical or lubri- cation ...
Page 65 - Compressor Replacement Procedure; charging the system with recovered refrigerant.; Humidifier; for periodic checks and maintenance.; hotter than lukewarm.
Component Operation and Maintenance, Checks and Adjustments 57 Compressor Replacement Procedure Replacement compressors are available from your Liebert supplier. They will be shipped in a reusable crate to the job site as required by the service contractor.Upon shipping a replacement compressor, the...
Page 66 - Changing Humidifier Lamps; Figure 9; Autoflush Infrared Humidifier Cleaning System; Steps 3 and 4 repeat as long as humidification is required.; Humidifier lamps
Component Operation and Maintenance, Checks and Adjustments 58 Changing Humidifier Lamps 1. Open disconnect switch.2. Open middle front panel.3. Remove screws securing line voltage compartment cover, then remove the cover.4. In line voltage compartment, disconnect one end of the purple jumpers, then...
Page 67 - units, and in the middle section of downflow units.; Figure 10 Steam generating humidifier; and goes to normal operation. No drain is permitted until then.; the canister must be replaced; immediately and replace the canister with the identical part.
Component Operation and Maintenance, Checks and Adjustments 59 7.5.2 Steam Generating Humidifier The humidifier drains and refills to maintain a current setpoint and alert the operator when the humidifier canister needs to be replaced. The humidifier is located in the lower section of upflow units, ...
Page 68 - Controls; Figure 11 Run/drain switch; Replacing the Canister
Component Operation and Maintenance, Checks and Adjustments 60 Controls The humidifier RUN/DRAIN switch is located in the unit low voltage compartment for most Deluxe models (in the humidifier assembly for models FH599, 600, 739, 740C). This switch should be in the RUN position when the humidifier i...
Page 69 - The canister is now ready to be removed.; Fault Descriptions
Component Operation and Maintenance, Checks and Adjustments 61 11. The canister is now ready to be removed. On the downflow chilled water units: Slide the humidifier cabinet bottom straight out toward you and drop the canister through the bottom of the cabinet.On all other units: Pull the canister s...
Page 70 - Circuit Board Adjustments; Capacity
Component Operation and Maintenance, Checks and Adjustments 62 Circuit Board Adjustments Humidifier operation is governed by the humidifier control board. This board is located in the lower right area of the panel in the control section of the unit, or in the humidifier compartment on models FH599C,...
Page 71 - Figure 12 Steam generating humidifier control board; Electric Reheat; DIP switch settings for steam generating humidifier; may be required to meet specific application requirements.
Component Operation and Maintenance, Checks and Adjustments 63 Figure 12 Steam generating humidifier control board 7.6 Electric Reheat Table 20 DIP switch settings for steam generating humidifier Unit Rated Voltage Capacity SW1 SW2 SW3 SW4 Rated Values Voltage AMP Set Pt 200/208 11 Off On Off On 208...
Page 72 - Troubleshooting; ROUBLESHOOTING; Use this section in troubleshooting your unit. Also refer to; . Suggestions are grouped by product function for convenience.; pressurized pipes and tubes.; Blower troubleshooting
Troubleshooting 64 8.0 T ROUBLESHOOTING Use this section in troubleshooting your unit. Also refer to 6.0 - Alarm Descriptions and Solu- tions . Suggestions are grouped by product function for convenience. ! WARNING Only qualified personnel should perform service on these units. Lethal voltage is pre...
Page 73 - Compressor and refrigeration system troubleshooting; Symptom
Troubleshooting 65 Table 23 Compressor and refrigeration system troubleshooting Symptom Possible Cause Check or Remedy Compressor will not start Power off Check main switch, fuses or CBs and wiring Current overload open Reset manually Loose electrical connections Tighten connections Compressor motor...
Page 75 - Dehumidification troubleshooting
Troubleshooting 67 Compressor continually cycles Faulty low pressure switch Repair or replace. Dirt or restriction in tubing to pressure stat Check and clean tubing. Defective liquid line solenoid valve Check valve and solenoid operator; replace if necessary. Plugged filter-dryer Replace filter Comp...
Page 76 - Humidifier—steam generator troubleshooting
Troubleshooting 68 Table 26 Humidifier—steam generator troubleshooting Symptom Possible Cause Check or Remedy False canister full indication Foaming Check drain valve to ensure that it drains freely. Check and replace if defective.Check water supply. If commercially softened, reconnect to raw water ...
Page 77 - Humidifier—infrared troubleshooting
Troubleshooting 69 Excessive arcing in the canister Drain valve clogged or defective Verify that drain valve operates freely when activated. Clean valve and replace coil or valve if defective. Flush canister several times and replace if arcing persists Improper water supply If water is commercially ...
Page 78 - Maintenance Inspection Checklist—Monthly; AINTENANCE
Maintenance Inspection Checklist—Monthly 70 9.0 M AINTENANCE I NSPECTION C HECKLIST —M ONTHLY Date: Prepared by: Model #: Serial #: Filters Refrigeration Cycle/Section 1. Unrestricted air flow 1. Check suction pressure 2. Check filter switch 2. Check refrigerant lines 3. Wipe section clean 3. Check ...
Page 79 - Maintenance Inspection Checklist—Semiannual; NOTES
Maintenance Inspection Checklist—Semiannual 71 10.0 M AINTENANCE I NSPECTION C HECKLIST —S EMIANNUAL Date: Prepared by: Model #: Serial #: Filters Refrigeration Cycle/Section 1. Unrestricted air flow 1. Check suction pressure 2. Check filter switch 2. Check refrigerant lines 3. Wipe section clean 3....
Page 80 - Precision Cooling
Ensuring The High Availability0f Mission-Critical Data And Applications. Emerson Network Power, the global leader in enabling business-criticalcontinuity, ensures network resiliency and adaptability througha family of technologies—including Liebert power and coolingtechnologies—that protect and supp...
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