Emerson VE manuale d’uso

Precision Cooling For Business -Critic al C ontinuity™ Li eber t D el uxe S ys tem /3 ™ Operation and Maint enanc e Manual 50 and 60 Hz , 6-30 T on D X Syst ems (D H/DE /VH/VE); 12-60 T on CW Syst e ms (FH/UH)[...]

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i T A BLE OF CONTENTS 1.0 I NTRODUCTI ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Compressorized Two -Step Systems . . . . .[...]

ii 4.4 Main Menu (AG)—View/Set Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 0 4.4.1 Active Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.2 Alarm History Log . . . . . . . . . . . . . . . . . . . . . . .[...]

iii 5.0 R ESPONSE BY C ONTROL T YP E —A DVANCED M ICROPROCESSOR C ONTROLS . . . . . . . . . . . 33 5.1 Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.1.1 Cooling/H eating Requ ired, in Perce nt (%) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

iv 7.0 C OMPONENT O PERATION AND M AINTENANCE , C HECKS AND A DJUST MENT S . . . . . . . . . . . . 48 7.1 System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.1.1 Environmental Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

v FIGURES Figure 1 Advanced microprocessor contro l panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2 Advanced microprocessor (AM) control me nu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3 Advanced microprocessor with graphi cs control pa[...]

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Introd uction 1 1.0 I NTRODUCTION 1.1 System Description Liebert Deluxe environmental co ntrol systems are av ailable in several configurations. Each configu- ration can operate with either Advanced Microproc essor Controls (AM), or Advanced Microprocessor Controls with Gr aphics (AG). A brief description of each, in cluding operational d ifference[...]

Introd uction 2 1.1.3 Chilled W ater Systems These systems utilize a central chiller and control co oling by modu lating 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 optiona[...]

Initial Start-Up Proced ure 3 2.0 I NITIAL S TAR T -U P P ROCEDURE Before beginning start-up, make ce rtain that unit was installed acco rding to the instructions in the Installation Manua l. All exterior panels must be in place. Locate the Start-Up form supplied with your unit documents. Co mplete the form during your start-up and mail it to Liebe[...]

Advanced Microprocessor Con trols 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 b oard details are described in this section. For more cont rol details refer to 5.0 - Response by C[...]

Advanced Microprocessor Con trols Setup 5 Figure 2 Advanced micropr ocessor (AM) control menu Operating Status View Setpoints Temp Setpoints Sensitivity Hi Temp Alarm Lo Temp Alarm Hi Hum Ala rm Lo Hum Alarm Run Diagnostics Show Inputs Test Output s Test Control Board Change Passw ords Setpoint Password Setup Password Status Alarm Data Acti ve Alar[...]

Advanced Microprocessor Con trols Setup 6 3.3 Main Menu (AM)—St atus/Alarm Dat a Selecting STATUS/ALARM DATA from the Main Menu will display the following sel ections: 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, disp lays any active alarm. The alarm[...]

Advanced Microprocessor Con trols Setup 7 3.3.5 Analog Sensors The four (4) analog sensor inputs can be monito red from this submenu of Status/Alarm Data. The inputs are filtered and displ ayed along with the text label assigned d uring setup. See Analog Setup on page 12 . 3.4 Main Menu (AM)—Setpoint s/Setup Selecting Setpoints/Setu p from the Ma[...]

Advanced Microprocessor Con trols Setup 8 Setup Operation The Setup Operation permits the review and/or adju stment 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 co[...]

Advanced Microprocessor Con trols Setup 9 Select Options The following tabl e lists ch oices on the Select Options menu. Thes e should match the options installed with your unit and should not need to change during normal operation. Calibrate Sensors The temperature an d humidity sensors can be cal ibr ated by selecting th is menu item. “Sensor?[...]

Advanced Microprocessor Con trols Setup 10 Dehumidification with Normal or Delayed Reheat: Dehumidification with normal reheat allows for operating BOTH compressors and reheats simultan eously. It is very import ant that electrical ser- vice to the unit be sized and wi red for this optio n if selected. With delayed reheat selected , the reheats are[...]

Advanced Microprocessor Con trols Setup 11 Enable Alarms: Each indi vidual alar m can be selected to be ENABLED (annunciated audibl y, visu- ally, and communicated to a Site Prod ucts System) or DISABLED (ignored) . Enable Common Alarm: Each in dividual alarm ca n be selected to energize or to not energize the common alarm relay. If the energi ze c[...]

Advanced Microprocessor Con trols Setup 12 St andard Alarm Messages • Water under floor • Smoke detected • Standby GC pump on • Loss of water flow • Standby unit on For more information co ncerning alarms, see 6.0 - Alarm Description s and Solutions . Humidity Control Method The user may select between relative (direct) and absol ute (pre[...]

Advanced Microprocessor Con trols Setup 13 Set St atus Display The Status Display can be set to show the return air temper ature and humidity SENSOR READ- INGS or the temperature and humidity control SETPOINTS through this selection. When SET- POINTS is selected, the status di splay indicates so by displaying “SETPTS.” If SENSOR READINGS is sel[...]

Advanced Microprocessor Con trols Setup 14 T est Output s When this feature is sel ected, the unit is e ffectively turned off. When stepping from one loa d to the next, the prev ious load, if on, i s turned off automatically. The load s can also be toggled on/off by selecting “ENTER”. Once turned on, the output will remain on for 5 minutes unle[...]

Advanced Microprocessor Con trols Setup 15 3.6 Main Menu (AM)—St atus Display The Status Display shows the presen t room temperature, humidity, active stat us functions (cooling, heating, dehumidify ing, humidifying), a nd active al arms. This is the data no rmally shown on the con- trol screen. If no key is pressed for five minutes, the system a[...]

Advanced Microprocessor Con trols Setup 16 3.8.2 Nonvolatile Memory All critical in formation is stor ed in nonvolati le memory. Setpoi nts, setup paramet ers, 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 selec[...]

Advanced Microprocessor Con trols Setup 17 3.9.1 Monitor functions 1. Temperature /Humidity: Present readings 2. Statu s: Cooling/Heatin g and Humidifyin g/Dehumidifying operating status i n 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 [...]

Advanced Microprocesso r with Graphics Control Setup 18 4.0 A DVANCED M ICROPROCESSOR WITH G RAPHICS C ONTROL S ETUP The Advanced Microprocessor with Gr aphics (AG) Control for your Deluxe unit featu res an easy-to- use, menu-driven LCD Graphics Displ ay. The menus, control features, and circuit board details are described in this section. For more[...]

Advanced Microprocesso r with Graphics Control Setup 19 Figure 4 Advanced microprocessor with graphics (AG) control menu Normal Disp lay Date and Tim e Set Clock ** Optional Cursor M ovement Use UP /DOWN to move the cursor. Hit ENTER to select the menu it em. ESC key moves backward through me nus tow ard the Mai n Men u . Any Key excep t ON/OF F ES[...]

Advanced Microprocesso r with Graphics Control Setup 20 4.2 Display the Main Menu—AG Control Press the MENU/ESC key to display the Main Menu. Th e Menu selections in clude: • VIEW/SET ALARMS • OPERATING STATUS • VIEW/SET CONTROL SETPOINTS • SYSTEM SETUP • RUN DIAGNOSTICS • DATE AND TIME • PLOT GRAPHS • ANALOG/DIGITAL INPUTS • VI[...]

Advanced Microprocesso r with Graphics Control Setup 21 4.4.3 Setup Alarms The list of alarms may be reviewed using the UP/DO WN keys. Any alarm may be selected to have its parameters modified by pressing the ENTER key. All alar ms have a time delay and alarm type parameter. The high/low temperat ure and humidity alarms also have a p rogrammable Tr[...]

Advanced Microprocesso r with Graphics Control Setup 22 4.4.4 Set Up Custom Alarms Selecting SETUP CUSTO M ALARMS will step to the following m enu: • SETUP CUSTOM ALARM TEXT • CHANGE CUSTOM TEXT 1 • CHANGE CUSTOM TEXT 2 • CHANGE CUSTOM TEXT 3 • CHANGE CUSTOM TEXT 4 The custom alarm messages ca n be selected from a list of standard message[...]

Advanced Microprocesso r with Graphics Control Setup 23 4.5 Main Menu (AG)—Operating St atus The Operating Sta tus is intended to provid e the user with displayed i nformation concern ing what the control is calling for the system to do. For example: The display indi cates the chilled water valve is 68% open . On a new call for cooling, it takes [...]

Advanced Microprocesso r 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 St art Delay This feature, also referre d to as Positive Start or Winter Start Kit, allows fo r the low pressure switch to be ignored for the programmed time du[...]

Advanced Microprocesso r with Graphics Control Setup 25 4.7.2 Select Options The following table is a list of feat ures that should match the option s 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 brated by selecting this menu item. “SENSOR?[...]

Advanced Microprocesso r with Graphics Control Setup 26 4.7.6 Select Humidity Sensing Mode This screen permits the user to select between RELATIVE (direct) and ABSOLUTE (predictive) humidity control. If relati ve is selected, the RH control is taken directly from the RH sensor. If abso- lute is selected, the RH control is aut omatically adju sted a[...]

Advanced Microprocesso r with Graphics Control Setup 27 4.8.1 Show Input s With the unit on and the fan running, the input state for the fo llowing devices may be displa yed: • Air Sail Switch: normally off unless Loss of Air Alarm i s active • Custom Alarm #1: No rmally off unless this alarm is active • Custom Alarm #2: No rmally off unless [...]

Advanced Microprocesso r with Graphics Control Setup 28 4.8.4 DIP Switches The DIP switch settings can be reviewed from the display panel. Chang ing the DIP switches requires opening the front pa nel for access to the DIP switches on the microprocessor control board. These selections should match opti ons installed on your unit and should not need [...]

Advanced Microprocesso r with Graphics Control Setup 29 Six different data types are recorded f or graphing: temperature, humidity, and fou r user defined ana- log inputs. Each data type can be viewed over thr ee different time scales and two different resolu- tions. The three ti me scales are 90 mi nutes, 8 hour s, and 24 hours. The tw o resolutio[...]

Advanced Microprocesso r with Graphics Control Setup 30 4.1 1.3 Read Digit al Inputs The four custom alarm inputs can be defined to be digital inputs. Digital inpu ts are used to sense cus- tomer devices for status display purposes only and will not activate the audibl e alarm. 4.1 1.4 Set Up Digit al Inputs A digital input is enabled by defining o[...]

Advanced Microprocesso r with Graphics Control Setup 31 4.13.3 Compressor Sequencing Control The lead compressor is the first one to be turned on when compressor operat ion is required. The la g compressor is turned on second if both compressors are required. Th e control monitors the operating time of both compressors and will automatically switch[...]

Advanced Microprocesso r with Graphics Control Setup 32 4.14.4 Control Output s Active control outputs are indicated with LEDs on the lower sec tion of the control board. Each LED is lit if the control output is active (on). Use thes e LEDs to assist in troubleshooting the system. 4.15 Communications The control system uses a two-wire, RS-422 chann[...]

Response by Control T ype—Advance d Microprocessor Controls 33 5.0 R ESPONSE BY C ON TROL 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 T emperature Control 5.1.1 Cooling/Heating Required, in P[...]

Response by Control T ype—Advance d Microprocessor Controls 34 5.1.3 Cooling Operation T wo-Step Cooling, Compressorized Direct Exp ansion (DX) Systems The first stage of cooling activate s when the temperature control calc ulates a requirement fo r cooling of 50%. The first stage of coolin g is deactivated when the cooling requirement drops belo[...]

Response by Control T ype—Advance d Microprocessor Controls 35 Hot W ater/Steam Heat The valve begins to open when the requirement fo r heating is 33% and is proportionally adjusted until the valve is full open at 1 00% heat req uirement. 5.2 Humidity Control 5.2.1 Dehumidification/Humidification Requi red, in Percent (%) The humidity control pro[...]

Response by Control T ype—Advance d Microprocessor Controls 36 Dual Cooling Source Dehumidification When dual cooling is availa ble, the humidity cont rol will calcula te a total dehumidificati on require- ment of 200% rather than 100%. The cooling v alve opens proport ionally as the requirement for dehu- midification rises fr om 0 to 100%. If mo[...]

Response by Control T ype—Advance d Microprocessor Controls 37 Suggested System T uning Procedure 1. Initially adjust the integral and deriva tive settings to 0%/degree- min and 0%/d egree/min. 2. Starting with 20% /degree, adjust the prop ortional setting in smal l increments (10% steps) until the control sustains a constant hunting action (the [...]

Response by Control T ype—Advance d Microprocessor Controls 38 Intelligent Control The Intelligent Control oper ates from a set of gene ra l rules that define how the control output should be adjusted for different system condi tions. The rules are designed to dup licate the actions that an experienced human operator would take if manually contro[...]

Response by Control T ype—Advance d Microprocessor Controls 39 5.3 Load Control Features 5.3.1 Short Cycle Control The control system monitors both compressors and prevents each fr om turning on w ithin a 3 minute period of being turned off. If th is (on, off, on ) o ccurs too often, ten (10) times in a one hour peri od, a Short Cycle alarm could[...]

Response by Control T ype—Advance d Microprocessor Controls 40 5.4 Analog Sensors 5.4.1 Connecting the Analog Senso rs The sensor inputs are factory-set to accept a 4 - 20 mA signal. The inputs can be changed by removing the appropriate jumpers on th e control circuit board. See Table 13 , Figure 5 and Figure 6 . The user supplied analog sensors [...]

Response by Control T ype—Advance d Microprocessor Controls 41 5.4.2 W ater Detection Display The water detection display is designed to graphica lly display the location of water under a raised floor when connected to an LT750 water detection system. The graphi cal floor plan screen shows a 30 x 16 grid. Each square represen ts one stan dard flo[...]

Response by Control T ype—Advance d Microprocessor Controls 42 Calibration Calibration should not be requi red for most installations. The accuracy of this disp lay is approxi- mately 1%. The display is calibrat ed by the slope and intercept v alues of Analog Inp ut #1. The position of the water is calculated from the analog output of the LT750 u[...]

Response by Control T ype—Advance d Microprocessor Controls 43 5.5.2 Vie w/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 Wa ter Flush Rate 2. Contro[...]

Alarm Descriptions and Solutions 44 6.0 A LARM D ESCRIPTIONS AN D S OLUTIONS The Advanced Microprocessor (AM) and the Advanc ed Microprocessor with Graphics (AG) Control systems will aud ibly and visually ann unciate all Enabled alarms, inclu d ing the four (4) custom alarms. With the AM & AG Controls, the customer al arms can be from the optio[...]

Alarm Descriptions and Solutions 45 6.1.3 Custom Alarms (Only With Advanced Controls) Custom alarm messages are progra mmed at the LCD display. The al arms may be specified by the customer at the time of order. Additional d evices and wiring may be required at the factory or by oth- ers. The message displayed may be included in this alphabetical li[...]

Alarm Descriptions and Solutions 46 6.1.10 Loss of Air Flow A differential air pressure swi tch is used to indica te loss of air flow in Deluxe units. Check for blockage of unit air outlet or inlet. C h eck blower motor fuses and over load reset. Check for broken belts. Make sure blower wheel s are tight to shaft. Run diagnostics to se e if the fan[...]

Alarm Descriptions and Solutions 47 6.2 Optional/Custom Alarms 6.2.1 Loss of W ater Flow No water flow is detected in the chilled water or condenser water supp ly line. An optional flow switch is required for this alarm. Check for serv ice valves closed, pumps not w orking, etc. 6.2.2 Smoke Detected Smoke is detected in the return ai r by an option[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 48 7.0 C OMPONENT O PERATION AND M AINTENANCE , C HECKS AND A DJUSTMENT S 7.1 System T esting 7.1.1 Environment al Control Functions The performance of all control circuit s can be tested by actuating each of the main functions. This is done by temporarily ch anging the setpoints. Coolin[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 49 7.1.2 Electric Panel The electric panel should be inspecte d for any lo ose electrical connections. Control T ransformer and Fuses The control system is divided into four (4) sepa ra te circuits. Fuses located on the transformer/fuse board individual ly protect the control voltage ci [...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 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 ch anged as required. Becaus e replacement intervals vary with en vironmental conditio n and filter typ e, each unit is equi[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 51 7.3.3 Electronic V ariable Speed Drive (Inverter) On large De luxe chilled wate r models an option al variable spee d drive inverte r is available. Th is packaged unit is factory set and should n ot requir e field adjustments. The variable speed drive sav es power by redu cing blower [...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 52 7.4.2 Suction Pressure Suction pressure will vary with load conditions. Th e low pressure sw itch will shut the compressor down if suction pressure falls be low the cut-out setting. On the other hand, high sucti on pressure reduces the ability of th e refrigerant to cool compressor co[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 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 st em counterclockwise to lower the superheat. 3. Turn the adjusting stem cloc kwise to increase the superheat. 7.4.6 Hot Gas Byp ass V alve Operat[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 54 7.4.7 Air Cooled Condenser Restricted airflow through the conden ser coil will reduce the operatin g efficiency of the unit and can result in high compressor head pressure and loss of cooling. Clean the condens er coil of all debris that will inhi bit air flow. This can be done with c[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 55 7.4.8 W ater/Glycol Cooled Condensers Shell and T ube Condensers Each water or glycol cooled modu le has a shell and tube condenser which consists of a shell, remov- able heads, g askets and cleanable co pper tubes. It may be necessary to clean the co pper tubing periodica lly to remo[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 56 7.4.9 Compressor Replacement Infrequently, a fault in the motor insulation may result in a motor burn. However, in a proper ly installed system, burnouts rarely o ccur. Of those that do, most are th e effects of mecha nical or lubri- cation failures, resulting in th e burnout as a sec[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 57 Compressor Replacement Procedure Replacement compressors are availa ble from your Lieb ert supplier. They will be shi pped in a reusable crate to the job site as required by the service contractor. Upon shipping a replacement compresso r, the service contractor will be billed in full [...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 58 Changing Humidifier Lamp s 1. Open disconne ct switch. 2. Open middle front panel. 3. Remove screws securing li ne voltage compartment cove r, then remove the cover. 4. In line voltage compartment, disconnect one end of the purp le jumpers, then locate the burned-out bulb with a conti[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 59 7.5.2 Stea m Generating Humidifier The humidifie r drains and refills to maintain a current setpoi nt and alert the operator when the humidifier canister needs to be repl aced. The humidifier is locate d in the lower section of upflow units, and in the middle section of downflow units[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 60 Controls The humidifier RUN/DRAIN switch is located in th e unit low voltage compartment for most Deluxe models (in the hu midifier assembly for model s FH599, 600, 739, 740C). This switch should be in the RUN position w hen the humidifier is in normal operation; i t should be in the [...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 61 11. The canister is now re ady to be removed. On the downflow chilled water units: Slide the hum idifier cabinet bo ttom straight out toward you and drop the canister throug h the botto m of the cabinet. On all other units: Pull the canister straight out of the cabinet to ward you. 12[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 62 Circuit Board Adjustment s Humidifier operation is governed by the humidi fier control board. Th is board is locat ed in the lower right area of the panel in the cont ro l section of the unit, or in th e humidifier compartment on models FH599C, 600C, 739C and 740C. There are two poten[...]

Component Operat ion and Maintenance, Checks and Adjustmen ts 63 Figure 12 Steam gen erating humidifier control board 7.6 Electric Reheat T able 20 DIP switch settings for steam generatin g humidifier Unit Rated Voltage Capacity SW1 SW2 SW3 SW4 Rated Values Voltage AMP Set Pt 200/208 11 Off On Off On 208 12.6 200/208 22 On Off On On 208 23.8 230 11[...]

Trou bleshoot ing 64 8.0 T ROUBLES HOOTING Use this section in troubleshooting your u nit. Also refer to 6.0 - Alarm Descriptions and Solu- tions . Suggestions are grouped by prod uct function for convenience. ! WARNING Only qualif ied personnel should perform serv ice on these units. Lethal voltage is present in some circuits. Use caution when tro[...]

Trou bleshoot ing 65 T able 23 Compressor and refrigeration system trou bleshooting 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 connection s Tighten connections Compressor motor burned out Check and replace compressor if [...]

Trou bleshoot ing 66 Refriger ant flooding Defective or improperly set expansion valve Increase superheat or replace valve Evaporator fan motor or belt Correct probl em or replace fan motor and/or belts. Low condensing pressure Check head pressure control device Slipping belts Inspect and adjust Blown valve plate or cylinder head in comp. Liquid re[...]

Trou bleshoot ing 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; re place if necessary. Plugged filter-dryer Replace filter Compressor motor protectors tripping or cycling Hig[...]

Trou bleshoot ing 68 T able 26 Humidifier—steam generator troubleshooting Symptom P ossible 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 supply. If connected to hot water reconnect[...]

Trou bleshoot ing 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 softened, reconnect humidifier to raw water supp[...]

Maintenance Inspecti on Checklist—Monthly 70 9.0 M AINTENANCE I NSPECTION C HECKLIST —M ONTHLY Date: Prepared by: Model #: Serial #: Filters Refrigeration Cycle/Section 1. Unres tricted air flow 1. Check suction pressure 2. Check filter switch 2. Check refrigerant lines 3. Wipe section clean 3. Check head pressure Blower S ection 4. Check for m[...]

Maintenance Inspection Chec klist—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. C heck filter switch 2. Check refrige rant lines 3. Wipe section clean 3. Check head pressure Blower Section 4. Chec[...]

Ensuring The Hi gh A vai labilit y 0f Mission-Critic al Data And Ap plic ations. Emerson Net work P ower , the global leader in enabling business-critical continuity , ensures network resiliency and adaptabilit y through a family of technologies—inc luding Liebert power and cooling technologies—that prot ec t and suppor t business-critical syst[...]