Related Manuals for Emerson Liebert Deluxe System/3 DE
Summary of Contents for Emerson Liebert Deluxe System/3 DE
- Page 1 Liebert Deluxe System/3 Operation and Maintenance Manual 50 and 60 Hz, 6-30 Ton DX Systems (DH/DE/VH/VE); 12-60 Ton CW Systems (FH/UH) ™ Precision Cooling For Business-Critical Continuity™...
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Page 3: Table Of Contents
............1 NTRODUCTION System Description. - Page 4 Main Menu (AG)—View/Set Alarms ..........20 4.4.1 Active Alarms .
- Page 5 ESPONSE BY ONTROL Temperature Control ............33 5.1.1 Cooling/Heating Required, in Percent (%) .
- Page 6 OMPONENT PERATION AND System Testing ............48 7.1.1 Environmental Control Functions .
- Page 7 Figure 1 Advanced microprocessor control panel..........4 Figure 2 Advanced microprocessor (AM) control menu .
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Page 9: Introduction
NTRODUCTION 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 description of each, including operational differences, are listed below. -
Page 10: Chilled Water Systems
1.1.3 Chilled Water Systems These systems utilize a central chiller and control cooling by modulating a control valve in the chilled water line. Cooling Modulating output water valve Heating Three stages of electric reheat standard; steam/hot water optional Humidification Infrared standard, steam grid and steam generating optional Dehumidification Chilled water valve opens proportionally in response to room needs ™... -
Page 11: Initial
NITIAL TART 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 form during your start-up and mail it to Liebert when start-up is completed. -
Page 12: Advanced
DVANCED ICROPROCESSOR 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 more control details refer to 5.0 - Response by Control Type—Advanced Micropro- cessor Controls, and for more alarm information refer to 6.0 - Alarm Descriptions and Solu- tions. -
Page 13: Figure 2 Advanced Microprocessor (Am) Control Menu
Figure 2 Advanced microprocessor (AM) control menu Normal Display Status Alarm Data Active Alarms Operating Status Alarm History Log Run Hours Log Analog Sensors Active Operating Alarm Alarms Status History Log No Alarms Present Alarm History Log Alarm 01 of 03 Alarm 01 of 01 15-APR-09:20:45 High Head PR... -
Page 14: Main Menu (Am)-Status/Alarm Data
Main Menu (AM)—Status/Alarm Data Selecting STATUS/ALARM DATA from the Main Menu will display the following selections: ACTIVE ALARMS OPERATING STATUS ALARM HISTORY LOG RUN HOURS LOG ANALOG SENSORS 3.3.1 Active Alarms This screen, a submenu of Status/Alarm Data, displays any active alarm. The alarms are numbered, #1 being the most recent. -
Page 15: Analog Sensors
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. Main Menu (AM)—Setpoints/Setup Selecting Setpoints/Setup from the Main Menu will display the following selections: VIEW SETPOINTS SETUP SYSTEM... -
Page 16: Table 2 Setup Functions And Factory Default Values
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 the programmed time during a cold start of the compressors, enabling the unit to run at low suction pressures. -
Page 17: Table 3 Select Options
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. Table 3 Select options Option Heating Yes or No Humidifier Yes or No Dehumidifier Yes or No... - Page 18 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. CAUTION If the electrical service to the unit is not properly sized for this option, it could trip the building circuit breakers (or fuses) or, in extreme cases, damage the building wiring.
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Page 19: Table 5 Alarm Default Time Delay
Table 5 Alarm default time delay Alarm Default Delay (seconds) Humidifier Problem High Head Pressure 1 High Head Pressure 2 Change Filter Loss of Air Flow Custom Alarm #1 Custom Alarm #2 Custom Alarm #3 Custom Alarm #4 High Temperature Low Temperature High Humidity Low Humidity... - Page 20 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 relative (direct) and absolute (predictive) humidity control. If relative is selected, the RH control is taken directly from the RH sensor.
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Page 21: Run Diagnostics
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 displaying “SETPTS.” If SENSOR READINGS is selected, the Status Display will show the return air sensor readings. -
Page 22: Change Passwords
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 output will remain on for 5 minutes unless toggled off or the Test Outputs function is exited by selecting “MENU/ESC”. -
Page 23: Main Menu (Am)-Status Display
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 is pressed for five minutes, the system automatically switches to the Status Dis- play. -
Page 24: Nonvolatile Memory
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. 3.8.3 DIP Switches Equipment options are selected and enabled using DIP switches 1 to 7. These are located at the upper left of the control board and are labeled SW1. -
Page 25: Monitor Functions
3.9.1 Monitor functions 1. Temperature/Humidity: Present readings 2. Status: Cooling/Heating and Humidifying/Dehumidifying operating status in percent 3. Present Alarms: Alarms presently active 4. Alarm History: 10 most recent alarms (60 most recent alarms for AG) 5. Run Time Log: Operating hours on major components 6. -
Page 26: Advanced
DVANCED ICROPROCESSOR WITH 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 details are described in this section. For more details on the control refer to 5.0 - Response by Control Type— Advanced Microprocessor Controls;... -
Page 27: Figure 4 Advanced Microprocessor With Graphics (Ag) Control Menu
Figure 4 Advanced microprocessor with graphics (AG) control menu View/Set Operating View/Set Control Alarms Status Setpoints Operating Status Setup Operation Compressor Cooling % Heating % Glycool %** Chilled Water Valve %** Humidification % Select Options Active Alarms Alarm History Log Setup Alarms High Temperature Low Temperature... -
Page 28: Display The Main Menu-Ag Control
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 •... -
Page 29: Setup Alarms
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 and humidity alarms also have a programmable Trip Point. The Trip Point is the point at which the alarm is activated. -
Page 30: Set Up Custom Alarms
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 from a list of standard messages or you can write your own messages. -
Page 31: Main Menu (Ag)-Operating Status
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. NOTE There may be some time lapse before a specific component matches the displayed number. For example: The display indicates the chilled water valve is 68% open. -
Page 32: Setup Operation
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 switch to be ignored for the programmed time during a cold start of the compressor. -
Page 33: Select Options
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. Table 10 Select options Option Heating Humidifier Dehumidifier Humidifier Pan Hot Gas Reheat Heat Stages* Dehumidification Stages *If heat stage is set to 2 on a chilled water unit, the... -
Page 34: Select Humidity Sensing Mode
4.7.6 Select Humidity Sensing Mode This screen permits the user to select between RELATIVE (direct) and ABSOLUTE (predictive) humidity control. If relative is selected, the RH control is taken directly from the RH sensor. If abso- lute is selected, the RH control is automatically adjusted as the return air temperature deviates from the desired temperature setpoint. -
Page 35: Show Inputs
4.8.1 Show Inputs With the unit on and the fan running, the input state for the following devices may be displayed: • Air Sail Switch: normally off unless Loss of Air Alarm is active • Custom Alarm #1: Normally off unless this alarm is active •... -
Page 36: Dip Switches
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. NOTE Power MUST be cycled off, then on from the unit disconnect switch for the control system to update the DIP switch settings (except for switch 8). -
Page 37: Modify Plot Scales
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, 8 hours, and 24 hours. The two resolutions are minimum and maximum. -
Page 38: Read Digital Inputs
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 Inputs A digital input is enabled by defining one of the four custom alarms to be STATUS ONLY type in the alarm setup screen. -
Page 39: Compressor Sequencing Control
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 both compressors and will automatically switch lead/lag compressor operation to maintain less than eight hours difference between the running times of two compressors. -
Page 40: Control Outputs
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. Table 12 Control output LEDs Heat Rejection LLSV1... -
Page 41: Response By
ESPONSE BY ONTROL This section describes how your Advanced Microprocessor Controls respond depending on the algo- rithm/control type selected in setting up the controls. Temperature Control 5.1.1 Cooling/Heating Required, in Percent (%) The temperature control program for the advanced microprocessor is based on a calculated percent requirement for cooling/ heating, but the response varies according to the control algorithm or type. -
Page 42: Cooling Operation
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 when the cooling requirement drops below 25%. The second stage of cooling is activated when the requirement for cooling rises to 100% and deactivated when the requirement falls below 75%. -
Page 43: Humidity Control
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. Humidity Control 5.2.1 Dehumidification/Humidification Required, in Percent (%) The humidity control program for the Advanced Microprocessor is based on a calculated % require- ment for dehumidification/ humidification. -
Page 44: Humidification Operation
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- midification rises from 0 to 100%. If more than 100% dehumidification is required, then the compressors are activated at 150% and 200% respectively. - Page 45 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 sustains a constant hunting action (the temperature swings are approximately the same amplitude from one peak to the next).
- Page 46 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 human operator would take if manually controlling the system. Just as an operator might take several things into consideration before making a temperature control decision, the Intelligent Control can be programmed to do likewise.
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Page 47: Load Control Features
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 one hour period, a Short Cycle alarm could occur. -
Page 48: Analog Sensors
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 Figure 6. The user supplied analog sensors MUST have their own power supply. -
Page 49: Water Detection Display
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. Each square represents one standard floor tile (approximately 2 ft. x 2ft.). Figure 6 Connecting the LT750 Physical Connections... -
Page 50: Communications
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 calculated from the analog output of the LT750 using the formula: position = analog reading/full scale reading X (measured length + slope) + intercept position is the distance from the LT750 to the position of the detected water. -
Page 51: View/Change Functions
5.5.2 View/Change Functions: 1. Setpoints Temperature Setpoint Temperature Sensitivity Humidity Setpoint Humidity Sensitivity High Temperature Alarm Low Temperature Alarm High Humidity Alarm Low Humidity Alarm Cold Start Delay Humidifier Flush Rate Chilled Water Flush Rate 2. Control Type: proportional, PID, intelligent 3. -
Page 52: Alarm
LARM ESCRIPTIONS AND 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, the customer alarms can be from the optional alarm list and/or can have their own fully custom text. -
Page 53: Custom Alarms (Only With Advanced Controls)
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. -
Page 54: Loss Of Air Flow
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 to shaft. Run diagnostics to see if the fan contactor is working properly. -
Page 55: Optional/Custom Alarms
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 Smoke is detected in the return air by an optional Liebert Smoke Detector. -
Page 56: Component
OMPONENT PERATION AND System Testing WARNING Potentially lethal voltages exist within this equipment during operation. Observe all cautions and warnings on unit and in this manual. Failure to do so could result in serious injury or death. Only qualified service and maintenance personnel should work with this equipment. 7.1.1 Environmental Control Functions The performance of all control circuits can be tested by actuating each of the main functions. -
Page 57: Electric Panel
7.1.2 Electric Panel The electric panel should be inspected for any loose electrical connections. WARNING Be sure that power to the unit is shut down before attempting to tighten any fittings or connections. Control Transformer and Fuses The control system is divided into four (4) separate circuits. Fuses located on the transformer/fuse board individually protect the control voltage circuits. -
Page 58: Filters
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 condition and filter type, each unit is equipped with a filter clog switch. This warns of restricted airflow through the filter compartment by activating the Change Filter alarm. -
Page 59: Electronic Variable Speed Drive (Inverter)
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 drive saves power by reducing blower speed to match unit load. If you suspect a problem with the inverter, first make sure that the INTELLIGENT CONTROL method is selected at the microprocessor. -
Page 60: Suction Pressure
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 ability of the refrigerant to cool compressor components and can result in compressor damage. -
Page 61: Hot Gas Bypass Valve
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 superheat. NOTE Make no more than one turn of the stem at a time. -
Page 62: Air Cooled Condenser
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 will inhibit air flow. This can be done with compressed air or commercial coil cleaner. -
Page 63: Water/Glycol Cooled Condensers
Component Operation and Maintenance, Checks and Adjustments 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 clean the copper tubing periodically to remove any scale or lime that should collect (periods between cleanings will vary with local water conditions). -
Page 64: Compressor Replacement
7.4.9 Compressor Replacement CAUTION Avoid touching or contacting the gas and oils with exposed skin. Severe burns will result. Use long rubber gloves in handling contaminated parts. Infrequently, a fault in the motor insulation may result in a motor burn. However, in a properly installed system, burnouts rarely occur. -
Page 65: Humidifier
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 service contractor will be billed in full for the compres- sor until the replacement has been returned to the factory. -
Page 66: Figure 9 Infrared Humidifier Lamps
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 locate the burned-out bulb with a continuity meter. 5. -
Page 67: Steam Generating Humidifier
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, and in the middle section of downflow units. Figure 10 Steam generating humidifier Operation 1. -
Page 68: Figure 11 Run/Drain Switch
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 is in normal operation; it should be in the DRAIN position when a manual drain for service is required. -
Page 69: Table 17 Humidifier Canister Part Numbers
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 straight out of the cabinet toward you. 12. -
Page 70: Table 19 Steam Generating Humidifier Capacity
Circuit Board Adjustments WARNING Circuit board adjustment should be performed by qualified personnel only. Hazardous voltages are present in the equipment throughout the procedure. Use extreme caution. If desired, power may be disconnected prior to the procedure. NOTE Numbers and percentages within parentheses ( ) in the following paragraphs refer to circuit board settings for downflow models FH599C, 600C, 739C and 740C. -
Page 71: Electric Reheat
Figure 12 Steam generating humidifier control board Table 20 DIP switch settings for steam generating humidifier Unit Rated Voltage Capacity 200/208 200/208 380/400/415 380/400/415 575* 575* *The values are only suitable in models FH600C and FH740C. All other models use a 575 volt to 460 volt step-down transformer and therefore use the 460V settings. -
Page 72: Troubleshooting
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 present in some circuits. -
Page 73: Table 27 Table
Table 23 Compressor and refrigeration system troubleshooting Symptom Possible Cause Power off Current overload open Compressor will not start Loose electrical connections Compressor motor burned out No call for cooling Compressor will not Solenoid valve not energizing operate, contactor not pulling in Low pressure switch not making contact... - Page 74 Table 23 Compressor and refrigeration system troubleshooting (continued) Symptom Possible Cause Defective or improperly set expansion valve Evaporator fan motor or belt Refrigerant flooding Low condensing pressure Slipping belts Blown valve plate or Liquid refrigerant floodback or cylinder head in comp. flooded start Blown valve plate or cylinder head gasket.
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Page 75: Table 24 Dehumidification Troubleshooting
Table 23 Compressor and refrigeration system troubleshooting (continued) Symptom Possible Cause Faulty low pressure switch Dirt or restriction in tubing to pressure stat Compressor continually cycles Defective liquid line solenoid valve Plugged filter-dryer High discharge pressure Defective overload relay Compressor motor High suction temperature protectors tripping or cycling... -
Page 76: Table 26 Humidifier—Steam Generator Troubleshooting
Table 26 Humidifier—steam generator troubleshooting Symptom False canister full Foaming indication Shorts or loose connections Main 24 VAC fuse or circuit breaker trips Faulty circuit board Unit ON, humidifier will Humidifier not receiving power not operate No water available to unit Contactor pulled in, but Clogged fill line strainer no water enters... -
Page 77: Table 27 Humidifier—Infrared Troubleshooting
Table 26 Humidifier—steam generator troubleshooting (continued) Symptom Drain valve clogged or defective Excessive arcing in the Improper water supply canister Insufficient drain rate Excessive iron content in water On cold start-up, canister fills, high water Conductivity of water too low alarm activates and humidifier fails to reach full amperage after 24... -
Page 78: Maintenance Inspection Checklist-Monthly
AINTENANCE NSPECTION Date: Model #: Filters 1. Unrestricted air flow 2. Check filter switch 3. Wipe section clean Blower Section 1. Impellers free of debris 2. Bearings free 3. Belt tension and condition Compressor Section 1. Check for leaks 2. Check oil levels Air Cooled Condenser (if applicable) 1. -
Page 79: Maintenance Inspection Checklist-Semiannual
10.0 M AINTENANCE NSPECTION Date: Model #: Filters 1. Unrestricted air flow 2. Check filter switch 3. Wipe section clean Blower Section 1. Impellers free of debris 2. Bearings free 3. Belt tension and condition 4. Inspect & tighten electrical connections Compressor Section 1. - Page 80 Embedded Computing Connectivity Embedded Power DC Power Monitoring Business-Critical Continuity, Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2007 Emerson Electric Co. Technical Support / Service [email protected] Outside the US: 614-841-6755 [email protected]...