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Troubleshooting

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

Compressor motor

protectors tripping or

cycling

High discharge pressure

Check for loss of condenser water or blocked condenser fan

or coil.

Defective overload relay

Replace.

High suction temperature

Reduce suction temperature by expansion valve adjustment

or provide desuperheating.

Loose power or control circuit

wiring connection

Check all power and control circuit connections.

Defective motor

Check for motor ground or short. Replace compressor, if

either condition is found.

Compressor cycles on

locked rotor

Low line voltage

Check line voltage and determine location of voltage drop.

Seized compressor (remove

bearing head assembly and

attempt to rotate crankshaft)

Replace compressor.

Compressor motor defective

Check for motor winding short or ground.

Single phasing

Check voltage across all 3 legs at contactor. Correct source

problem.

Liquid refrigerant condensing in

cylinder

Check and replace valve plates.

Motor burnout

Check control panel for welded

contactor contacts or welded

overload contacts

Replace defective components.

Table 24

Dehumidification troubleshooting

Symptom

Possible Cause

Check or Remedy

No dehumidification

Control not calling for

dehumidification

Check monitor status.

Compressor contactor not pulling in

See Compressor Section.

Compressor won't run; fuse blown

or CB tripped

See Compressor Section. Check fuses or CBs and

contacts. Check line voltage

Table 25

Glycol pumps troubleshooting

Symptom

Possible Cause

Check or Remedy

Suddenly stops

pumping

Clogged strainer or impeller

Clean out debris.

Suddenly slow pumping

Clogged impeller, diffuser, or line

Clean out debris and use strainer.

Excessive leakage

around the pump shaft

while operating

Worn seal or packing

Replace seal or packing.

Performance poor

Worn impeller or seal

Replace with new impeller or seal.

Suction lift too high

Relocate pump closer to supply.

Motor not up to speed; low voltage

Larger lead wires may be required Check for proper

line voltage (±10%).

Worn bearings

Replace pump

Noisy operation

Worn motor bearings

Replace pump

Low discharge head

Throttle discharge-improve suction conditions.

Debris lodged in impeller

Remove cover and clean out.

Cavitating pumps

Adjust system pressures.

Table 23

Compressor and refrigeration system troubleshooting (continued)

Symptom

Possible Cause

Check or Remedy

Содержание Liebert Deluxe System/3 DE

Страница 1: ...Precision Cooling For Business Critical Continuity 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 ...

Страница 2: ......

Страница 3: ...n Hours Log 6 3 3 5 Analog Sensors 7 3 4 Main Menu AM Setpoints Setup 7 3 4 1 View Setpoints Selection 7 3 4 2 Setup System Selection 7 3 4 3 Run Diagnostics 13 3 4 4 Change Passwords 14 3 5 Main Menu AM Date and Time 14 3 6 Main Menu AM Status Display 15 3 7 Load Control Features 15 3 7 1 Short Cycle Control 15 3 7 2 Sequential Load Activation Control 15 3 7 3 Compressor Sequencing Control 15 3 8...

Страница 4: ...26 4 8 1 Show Inputs 27 4 8 2 Test Outputs 27 4 8 3 Test Control Board 27 4 8 4 DIP Switches 28 4 9 Main Menu AG Date and Time 28 4 10 Main Menu AG Plot Graphs 28 4 10 1 Modify Plot Scales 29 4 11 Main Menu AG Analog Digital Inputs 29 4 11 1 Read Analog Inputs 29 4 11 2 Setup Analog Inputs 29 4 11 3 Read Digital Inputs 30 4 11 4 Set Up Digital Inputs 30 4 12 Main Menu AG View Run Hours Log 30 4 12...

Страница 5: ...2 Water Detection Display 41 5 5 Communications 42 5 5 1 Monitor functions 42 5 5 2 View Change Functions 43 6 0 ALARM DESCRIPTIONS AND SOLUTIONS 44 6 1 Standard Alarms 44 6 1 1 Change Filter 44 6 1 2 Compressor Overload 44 6 1 3 Custom Alarms Only With Advanced Controls 45 6 1 4 High Head Pressure 45 6 1 5 High Humidity 45 6 1 6 High Humidity and Low Humidity Simultaneously 45 6 1 7 High Temperat...

Страница 6: ...tem 51 7 4 1 Compressor Oil Level 51 7 4 2 Suction Pressure 52 7 4 3 Discharge Pressure 52 7 4 4 Suction Superheat 52 7 4 5 Thermostatic Expansion Valve 52 7 4 6 Hot Gas Bypass Valve 53 7 4 7 Air Cooled Condenser 54 7 4 8 Water Glycol Cooled Condensers 55 7 4 9 Compressor Replacement 56 7 5 Humidifier 57 7 5 1 Infrared Humidifier 57 7 5 2 Steam Generating Humidifier 59 7 6 Electric Reheat 63 8 0 T...

Страница 7: ... Table 7 Alarm default time delay 21 Table 8 Default control and alarm setpoints 23 Table 9 Setup functions and factory default values 24 Table 10 Select options 25 Table 11 DIP switch settings 28 Table 12 Control output LEDs 32 Table 13 Changing factory set sensor inputs 40 Table 14 Additional connections available after unit delivery 40 Table 15 Suction pressures 52 Table 16 Discharge pressures ...

Страница 8: ...vi ...

Страница 9: ...d steam grid and steam generating optional Dehumidification Utilizes the lag compressor 1 1 2 Compressorized Four Step Systems The 4 stage systems have all the features of a compressorized 2 stage system plus cylinder unloaders on one head of each compressor This permits the compressors to operate at a reduced level and increases energy efficiency during low load conditions The system responds to ...

Страница 10: ...reatly reduc ing the compressor operation Cooling Modulated cooling valve opens proportionally to match room needs primary two or four stages of mechanical refrigeration secondary Heating Three stages of electric reheat standard Humidification Infrared standard steam generating optional Dehumidification Utilizes the lag compressor 1 1 5 Dual Source Cooling Systems This system has all the features ...

Страница 11: ... only 7 If you do not want your unit to operate at factory default settings set temperature and humidity setpoints and sensitivity alarms and other control functions Refer to 3 0 Advanced Microprocessor Controls Setup or to Advanced Microprocessor with Graphics Control Setup on page 18 8 Turn OFF main unit disconnect and main breaker Unit ON button should be OFF 9 Replace all fuses you removed dur...

Страница 12: ...urn the unit off press the ON OFF key before power is disconnected Active alarms are displayed on the LCD screen An audible beeper also annunciates alarms To silence an alarm press the ENTER key as prompted on the display The unit stores the 10 most recent alarms for review Setpoints DIP switch settings and other selections were made on your unit before testing at the fac tory Setpoints were chose...

Страница 13: ... Power Custom Alarms Programmed Alarm Messages Water Under Floor Smoke Detected Standby GC Pump On Loss of Water Flow Standby Unit On User Customized Alarm Messages Available for Custom Alarms Alarms Available Some alarms require optional equipment Optional Calibrate Actuator Run Diagnostics Setup System No Alarms Present OR Alarm 01 of 01 High Head PR Use to Scroll Date and Time 15 APR 2001 09 30...

Страница 14: ...e and time each occurred The first alarm in the His tory Log is the most recent and the tenth is the oldest If the alarm history is full showing 10 alarms and a new alarm occurs the oldest is lost and the newest is saved becoming the first in the list in alarm history location 1 The rest are moved down the list by one position the second alarm becomes the third and so on The Alarm History Log on a...

Страница 15: ...efault setpoints and their allowable ranges 3 4 2 Setup System Selection The Setup System a submenu of Setpoints Setup includes the following selections SETUP OPERATION SELECT OPTIONS CALIBRATE SENSORS SHOW DIP SWITCHES SELECT CONTROL TYPE SETUP ALARMS HUM CONTROL METHOD ANALOG SETUP SET STATUS DISPLAY CALIBRATE ACTUATOR NOTE Setpoints and system setup parameters are kept in nonvolatile memory Tab...

Страница 16: ...ll and flush the pan for about 4 1 2 minutes for a small pan or 7 1 2 minutes for a large pan Pan size is selected based on unit specifications and is preset at the factory During humidifier operation with the flush rate set at the default of 150 the valve is opened peri odically to add water to the pan about 45 seconds every 7 minutes of humidifier operation for a small pan or 80 seconds every 10...

Страница 17: ...IP switches requires opening the upper panel for access to the DIP switches on the microprocessor control board These selections should match options installed on your unit and should not need to change during normal operation Switches 1 through 6 are self explanatory Switch 7 is described in more detail below DIP switch 8 not shown above enables the password feature when set to ON and disables th...

Страница 18: ...d for temper ature control while humidity will continue to use Proportional Control For chilled water units with the optional Variable Speed Drive Intelligent Control is required for proper operation Refer to 5 0 Response by Control Type Advanced Microprocessor Controls for more detail on types of control Setup Alarms Selecting SETUP ALARMS will step to the following menu SET TIME DELAYS ENABLE AL...

Страница 19: ...r a custom alarm select SELECT ALARM Then select which alarm you would like to change 1 through 4 Using the UP DOWN arrows will step through the list of five standard alarm messages see Standard Alarm Messages on page 12 and the two custom alarms Press ENTER to make your selection To modify the two custom alarm messages go back one screen and select CHANGE CUSTOM TXT 1 or 2 Text can be up to 20 ch...

Страница 20: ...ty control program predicts what the RH will be when the dehumidification cycle ends and temperature returns to the setpoint This allows the dehu midification cycle to end at the proper time The predictive humidity control can reduce energy con sumption by minimizing compressor and reheat operation and eliminating unnecessary humidifier operation Analog Setup For installation of analog sensors see...

Страница 21: ...puts outputs and com plete a test of the microcontroller circuit board all from the front panel Review of the system inputs and the microcontroller test can be done without interrupting normal operation To test the system outputs the normal system control is temporarily suspended DO NOT leave the unit in the diagnos tics mode any longer than is necessary for troubleshooting The control system will...

Страница 22: ...MV humidifier makeup valve Comm alarm common alarm relay Test Control Board By selecting this function the microcontroller will perform a self test lasting approximately 10 sec onds At the end of the test the ROM checksum ROM part number and version number will be dis played 3 4 4 Change Passwords This function prompts you to enter a three digit password when making changes The system includes two...

Страница 23: ...th compressors and will automatically switch lead lag compressor operation to maintain less than eight hours difference between the running times of two compressors When the operating hours on the lead compressor become eight hours greater than on the lag com pressor the lead lag operation is automatically switched If the lead compressor is operating by itself at that time it will be turned off th...

Страница 24: ...oducts This communication directly out of the control uses a proprietary protocol Your unit can have a variety of different Site Product devices wired to this port depending on the monitoring system you are using Liebert Site Product Device SiteScan Centralized Monitoring System Stand alone facility monitoring system SiteLink BMS Interface Module For Modbus or BACnet communication to a third party...

Страница 25: ...Log Operating hours on major components 6 Daily Log High and Low Temperature Humidity 3 9 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 intelligen...

Страница 26: ...urn the unit on press the ON OFF key after power is applied To turn the unit off press the ON OFF key before power is disconnected Active alarms are indicated on the LCD screen by a ringing bell graphic Alarms are also annunciated by an audible beeper To silence an alarm press the ENTER key as prompted on the display The unit stores the 60 most recent alarms for review Setpoints DIP switch setting...

Страница 27: ...Hours Setup Analog Inputs Analog Input 1 2 3 4 Slope Units Text Intercept Read Digital Inputs Setup Digital Inputs How to Text Analog Input 1 Analog Input 2 Analog Input 3 Analog Input 4 Read Analog Inputs Analog Sensor 2 Plot Temperature Plot Humidity Plot Analog Sensor 1 Plot Analog Sensor 3 Plot Analog Sensor 4 Plot Modify Plot Scales Modify Temp Scales Modify Humidity Scales Modify Analog Sens...

Страница 28: ...ol is calling for heating three moving heat rays are displayed next to the word Heating In the bottom quadrant there may be one of two symbols relating to humidification and dehumidification If the control is calling for humidification a growing water drop is shown next to the word Humidification If the control is calling for dehumidification a shrinking water drop is shown next to the word Dehumi...

Страница 29: ... selected to be a Status Only input If the alarm is DISABLED it is ignored If the alarm is WARNING or URGENT it will be annunciated audibly visually and communicated to a Site Products System if appropriate If the alarm is selected to be a WARNING the alarm will NOT activate the common alarm relay When the alarm is selected to be URGENT the alarm is first annunciated as a WARNING and then annuncia...

Страница 30: ... tile The UP key will move the cursor tile up and then it wraps around to the bottom of the next column to the right The DOWN arrow key moves the cursor down then to the top of the next column to the left The cursor will also wrap around from the right top tile to the left bottom tile and back There are three different types of tiles to be defined the environmental unit the LT750 and sensor cable ...

Страница 31: ...ed and or changed through the display The following table lists the default setpoints and their allowable ranges Unit will operate at these conditions but will not control to these extremes of conditions 4 7 Main Menu AG Setup System Selecting SETUP SYSTEM will step to the following menu SETUP OPERATION SELECT OPTIONS CALIBRATE SENSORS CALIBRATE VALVE ACTUATOR SELECT CONTROL ALGORITHM SELECT HUMID...

Страница 32: ... fill is about 30 seconds The valve continues to fill and flush the pan for about 4 minutes During humidifier operation with the flush rate set at the default of 150 the valve is opened peri odically to add water to the pan about 40 seconds every 9 and 1 2 minutes of humidifier operation This adds enough water to the pan to cause about a third of the total water used to be flushed out the overflow...

Страница 33: ...ve 50 open To change the valve travel time first enter the CALIBRATE VALVE ACTUATOR screen The display will show the present period used by the control for valve actuator full travel Press ENTER and adjust the time using the UP DOWN arrows When the correct time is displayed press ENTER to store the new time in memory 4 7 5 Select Control Algorithm The type of system control method used by the micr...

Страница 34: ... the RH will be when the dehumidification cycle ends and temperature returns to the setpoint This allows the dehu midification cycle to end at the proper time The predictive humidity control can reduce energy con sumption by minimizing compressor and reheat operation and eliminating unnecessary humidifier operation 4 7 7 Set Status Display The Status Display can be set to show the return air tempe...

Страница 35: ...t 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 Compressor is limited to 15 seconds on to prevent damage DO NOT leave the unit in the test outputs mode any longer than is necessary for troubleshooting Th...

Страница 36: ...the reheats are turned off 4 9 Main Menu AG Date and Time The current date and time is available through the display This feature allows the date and time to be read or changed and is accessed by selecting DATE AND TIME from the Main Menu The DATE AND TIME is used by the control for recording the Alarm History and plotting graphs The date and time are backed up by a battery 4 10 Main Menu AG Plot ...

Страница 37: ... display The inputs are filtered then dis played along with the text label assigned during setup 4 11 2 Setup Analog Inputs For installation of analog sensors see 4 11 Main Menu AG Analog Digital Inputs After selecting a compatible sensor and properly wiring it to the terminals setting up the control to monitor the sensor is as follows Slope The slope is a multiplier used to scale the input signal...

Страница 38: ...will be displayed as 25 on for that hour 4 12 2 View Total Run Hours The total operating hours of all major components in the unit can be monitored from the display and are retained in nonvolatile memory Run times are available for the following COMPRESSOR 1 COMPRESSOR 2 GLYCOOL COIL or DUAL COOL COIL FAN HUMIDIFIER REHEAT 1 or HOT WATER REHEAT REHEAT 2 REHEAT 3 CHILLED WATER COIL HEAT REJECTION T...

Страница 39: ...s P5 removed P12 removed P19 installed Pins 1 and 2 P47 installed Pins 1 and 2 P48 installed Pins 1 and 2 P50 all jumpers installed for 4 20 mA analog inputs See Table 14 for other configurations P51 removed 4 14 1 LCD Display Contrast The level of contrast due to the viewing angle of the LCD display can be adjusted using a small thumb wheel at the upper left of the control board just under the ca...

Страница 40: ...or via a modem Consult the User Manual of the appropriate device for specific installation and operation information 4 15 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 ho...

Страница 41: ...mperature is controlled at or near the temperature set point independent of the room load The cooling heating requirement is calculated by adding together three individual terms proportional integral and derivative The proportional term is figured in a manner similar to the previously described Proportional Con trol The integral term sometimes called reset action is figured by measuring how much a...

Страница 42: ...YCOOL capacity first becomes available when the entering glycol temperature is at least 8 F 22 capacity below the return air tempera ture or 3 F below the return air temperature for 2 hours GLYCOOL capacity is 100 when the gly col temperature is 25 F below the return air temperature The system will continue to Econ O Cool as necessary as long as the entering glycol temperature remains at least 3 F...

Страница 43: ...f single compressor dehumidification is selected a compressor is activated when the humidity control calculates a requirement of 100 the compressor is deactivated when the requirement falls below 50 Two Stage Dehumidification Compressorized Direct Expansion DX Systems The first stage of dehumidification activates when the humidity control calculates a requirement for dehumidification of 50 The fir...

Страница 44: ...is used only for temperature If PID Control is selected humidity will continue to use Proportional Control The proportional P term is determined by the difference between the current temperature and the control setpoint This term is expressed in cooling heating desired for each degree above below the setpoint It is adjustable from 0 to 100 per degree The purpose of this term is to adjust the contr...

Страница 45: ...e calculated by the following equation time between peaks x 5 The above tuning procedure is only an approximation for an initial set of adjustments and are based on the average room characteristics Your particular settings may need to be further adjusted for optimum PID Control performance Some suggestions for additional tuning are If cooling output overshoot is occurring on load changes decrease ...

Страница 46: ...l equation to define the operation of the con trol for all conditions such as a proportional or PID Control You can expect Intelligent Control to be more efficient and precise for most applications but system performance based on room conditions is not as predictable as standard approaches that use a fixed equation The Liebert Intelligent Control includes rules that significantly enhance the perfo...

Страница 47: ...3 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 compr...

Страница 48: ...inals are located in the field wiring compartment of the unit Wire sensors to the terminals as follows Consult your Liebert supplier for a field installation kit to add these connections after if required Figure 5 Analog input jumpers Table 13 Changing factory set sensor inputs Terminal Signal 41 Input 1 42 Input 1 43 Input 2 44 Input 2 45 Input 3 46 Input 3 47 Input 4 48 Input 4 Table 14 Addition...

Страница 49: ...rms 1 and 2 are Enabled to either Warning or Urgent type Do this by selecting View Set Alarms from the Main Menu Then select Setup Alarms Follow the instructions on the display to select the required type for Custom Alarm 1 and Custom Alarm 2 if not already set Next select the alarm message for Custom Alarm 1 and 2 From the Main Menu select View Set Alarms Then select Setup Custom Alarms Then sele...

Страница 50: ...he slope increases its effect for larger distances The best procedure to calibrate the cable would be to first simulate water close to the LT750 about 5 tiles out Adjust the intercept to get the correct reading Next simulate water 5 tiles from the end Adjust the slope to get the correct reading 5 5 Communications The control system uses a two wire RS 422 channel to communicate with remote monitori...

Страница 51: ...ity 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 PID Parameters Proportional Derivative and Integral Gains 4 On Off Status 5 Time View Only 6 Silence Alarm ...

Страница 52: ... the Normal Status Display For the AG the bell and hammer are shown at the top of the Normal Sta tus Display For the AM the bottom line will display the number of Active Alarms For the SM the alarm is displayed by a lighted LED next to the alarm text The active alarms can be reviewed on the Advanced Microprocessor Controls by selecting Active Alarms The alarms can also be silenced through communic...

Страница 53: ...ir humidity has increased to the High Humidity Alarm setpoint check the following Is the unit setup for dehumidification check DIP switch Check for proper setpoints Does the room have a vapor barrier to seal it from outdoor humidity Are doors or windows open to outside air Run diagnostics to make sure the cooling system is working properly the cooling system dehumidifies 6 1 6 High Humidity and Lo...

Страница 54: ... alarm stays active for ninety minutes Look for conditions that would cause loss of refrigerant Check for piping problems such as leaks or crimped lines Check for inoperative components such as liquid line solenoid valve low pressure switch expansion valve and head pressure control valve Check for closed service valves in the liquid line or at the condenser or receiver 6 1 14 Low Temperature If th...

Страница 55: ...rce of smoke or fire and follow appropriate emergency procedures 6 2 3 Standby GC Pump On The primary pump has failed and the standby pump is activated glycol cooled and GLYCOOL units only Check for problems with the primary pump fuses blown motor burn out service valve shut stuck check valve impeller damage etc 6 2 4 Standby Unit On The primary environmental control system has had an alarm condit...

Страница 56: ...will be produced Return the humidity setpoint to the desired humidity Dehumidification Dehumidification can be checked by setting the humidity setpoint to a relative humidity 10 below room relative humidity The compressor should come on Return humidity setpoint to the desired humidity Proportional Heating Cooling Dehumidification On Chilled Water GLYCOOL Econ O Cycle Free Cool GLYCOOLING cycle mod...

Страница 57: ...control circuit to deactivate the unit and activate the alarm system if airflow is inter rupted Firestat The optional firestat is a bimetal operated sensing device with a Normally Closed switch This device will shut down the entire unit when the inlet air temperature exceeds a preset point It is connected between terminals 1 and 2 at plug P39 Smoke Detector The optional smoke detector power supply...

Страница 58: ...ry supplied adjustable motor sheaves Due to variations in applications a fixed motor pulley may be desired and can be substituted for the adjustable sheave after obtaining and confirming the desired air flow This will reduce vibration and wear on the belts and pulleys Consult the factory for more information 7 3 1 Fan Impellers and Bearings Fan impellers should be periodically inspected and any de...

Страница 59: ...s can be a major factor in the prevention of most system failures Refrigerant lines must be properly supported and not allowed to vibrate against ceilings floors or the unit frame Inspect all refrigerant lines every six months for signs of wear and proper support Also inspect capillary and equalizer lines from the expansion valve and support as necessary Each liquid line has a sight glass that ind...

Страница 60: ...3 Add the estimated pressure drop between bulb location and suction valve 4 Convert the sum of the two pressures to the equivalent temperature 5 Subtract this temperature from the actual suction line temperature The difference is superheat 7 4 5 Thermostatic Expansion Valve Operation The thermostatic expansion valve performs one function It keeps the evaporator supplied with enough refrigerant to ...

Страница 61: ...sult is a reduction in the cooling capacity of the unit to match the load Adjustment Upon deciding what evaporator temperature is desired the following procedure should be used to adjust the hot gas bypass valve 1 Install the suction and discharge pressure gauge 2 Turn thermostat to call for cooling so that the refrigeration compressor will run 3 Remove the TOP adjusting nut from the valve 4 Inser...

Страница 62: ...Back Head Pressure Control The system refrigerant level must be periodically checked This is easily done by the following proce dure 1 Adjust temperature setpoint in the unit so that the compressor will run continuously 2 The refrigerant level is visible through two sight glasses on the receiver and will vary with ambient temperature a 40 F 4 4 C and lower Midway on the bottom sight glass b 40 to ...

Страница 63: ... pressure and adjusting screw Adjustment Johnson Controls Penn Johnson valves The valves may be adjusted with a standard refrigeration service valve wrench or screwdriver Refer to Table 16 for recommended refrigerant pressures To lower the head pressure setting turn the square adjusting screw clockwise until the high pressure gauge indicates the desired setting To raise the head pressure setting t...

Страница 64: ...anical Failure A mechanical compressor failure will not be indicated by a burned odor The motor will attempt to run If you have determined that a mechanical failure has occurred the compressor must be replaced If a burnout does occur correct the problem that caused the burnout and clean the system It is impor tant to note that successive burnouts of the same system are usually caused by improper c...

Страница 65: ...e vacuum each time with clean dry refrigerant to 2 PSIG 13 8 kPa 11 Charge the system with refrigerant R 22 based on requirements of the evaporator condensing unit and lines Refer to the installation manual or the unit nameplate 12 Apply power and operate the system Check for proper operation Refer to Table 16 for design pressures 7 5 Humidifier 7 5 1 Infrared Humidifier During normal humidifier o...

Страница 66: ...a call for humidification 1 If the humidifier has not been activated for over 30 hours the autoflush will flow water into the pan for about 30 or 60 seconds based on the size of the pan This will provide a minimum amount of water in the pan and prevent heat damage to the humidifier pan Humidifier lamps are OFF 2 If the humidifier has been activated within the last 30 hours Step 1 is bypassed The a...

Страница 67: ... set at 60 84 seconds During this repeating time cycle the fill valve will open periodically to replenish the water being boiled off and maintain a steady state output at the set point 4 After many cycles the mineral concentration in the canister becomes too high When this occurs the water boils too quickly As the water quickly boils off and less of the electrode is exposed the current flow decrea...

Страница 68: ...position after the canister has drained 4 Turn OFF the power at the main unit 5 Remove the cover from the humidifier cabinet 6 FOR ALL MODELS EXCEPT FH599C 600C 739C and 740C refer to replacement instructions that accompany replacement kit 153315P1 and P2 7 For models FH599C 600C 739C and 740C locate the power wires to the steam canister Make note of the wiring configuration before removing any wi...

Страница 69: ...nts Table 17 Humidifier canister part numbers Unit Model Part Number Voltage Capacity lbs hr kg hr All except below 200 230 380 575 11 or 22 5 or 10 153315P1 153315P2 FH599C 600C 739C 740C 136799P1 200 480 22 10 FH599C 600C 739C 740C 136799P2 575 22 10 Note 575 V units have a step down transformer included with unit CAUTION When reconnecting the power wiring follow exactly the instructions include...

Страница 70: ...r These are preset at the factory and should not be changed Refer to Table 19 for the capacity of your unit Find your unit voltage and capacity in Table 20 to determine the correct DIP switch settings for your humidifier A potentiome ter R40 is used to regulate the capacity of the humidifier This adjustment is factory set fully clock wise to 100 It can be used to reduce humidifier capacity but sho...

Страница 71: ...Off Off 480 5 5 460 22 Off Off Off On 480 10 5 575 11 Off Off Off Off 575 4 2 575 22 Off On Off On 575 9 8 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 CAUTION Reheat element sheaths and fins are manufactured with stainless steel Regular inspections are necessary to assure proper clean...

Страница 72: ...o P9 2 Unit should start If unit stops after jumper is removed replace S1 Blower runs but controls will not operate Relay R1 not making contact standard controls only Check for 24 VAC between P36 9 and P36 10 If voltage is not present R1 is not receiving power Check air switch Jumper P36 4 to P36 7 If R1 closes air switch is not closing check for blower rotation loose wiring and pinched tubing Rem...

Страница 73: ...low gas pressure Compressor is running on Positive Start Kit air cooled systems only Solenoid not opening Check magnetic field to see if energized High discharge pressure Dirty condenser or drycooler fins Clean coil Condenser equipment not operating Check operation High refrigerant charge Check refrigerant charge Hot gas bypass valve adjusted improperly Adjust properly Water regulating valve adjus...

Страница 74: ...ctive oil failure control Loose compressor or piping support Tighten clamps Broken connecting rods valves or other running gear Replace compressor Pipe rattle Loose pipe connections Check pipe connections Compressor running hot Blown valve plate or cylinder head gasket See Symptom Blown Valve Plate Broken suction or discharge valve Replace valves and valve plate if necessary Compression ratio too ...

Страница 75: ...valve plates Motor burnout Check control panel for welded contactor contacts or welded overload contacts Replace defective components Table 24 Dehumidification troubleshooting Symptom Possible Cause Check or Remedy No dehumidification Control not calling for dehumidification Check monitor status Compressor contactor not pulling in See Compressor Section Compressor won t run fuse blown or CB trippe...

Страница 76: ...so be connected to the electrode closest to the steam outlet port Verify that the red wire from terminal 2 on the interface connects to the red top terminal on the canister This is the one farthest from the steam outlet port and is the high water sensor probe Full isolation has broken down Remove red canister full wire from canister If normal operation resumes canister must be replaced Remove the ...

Страница 77: ...l condition verity that the fill solenoid closes tightly Table 27 Humidifier infrared troubleshooting Symptom Possible Cause Check or Remedy No humidification Humidifier pan not filling Check water supply Check fill valve operation Check drain stand pipe adjustment Check for clogged waterline Control not calling for humidity Check monitor status Humidity contact not pulling in Check visually If co...

Страница 78: ...tension and condition 7 Check thermostatic exp valve Compressor Section Reheat 1 Check for leaks 1 Check reheat element operation 2 Check oil levels 2 Inspect elements for cleanliness and corrosion Air Cooled Condenser if applicable 1 Condenser coil clean Steam Generating Humidifier 2 Motor mount tight 1 Check canister for deposits 3 Bearings free and in good condition 2 Check condition of steam h...

Страница 79: ...clean Steam Generating Humidifier 2 Motor mount tight 1 Check canister for deposits 3 Bearings free and in good condition 2 Check condition of steam hoses 4 Refrigerant lines properly supported 3 Check water make up valve for leaks 5 Inspect tighten electrical connections 4 Inspect tighten electrical connections Water Glycol Condenser if applicable 5 Inspect clean out entire drain line 1 Cleaning ...

Страница 80: ...mes referred to are trademarks or registered trademarks of their respective owners Technical Support Service Web Site www liebert com Monitoring 800 222 5877 monitoring emersonnetworkpower com Outside the US 614 841 6755 Single Phase UPS 800 222 5877 upstech emersonnetworkpower com Outside the US 614 841 6755 Three Phase UPS 800 543 2378 powertech emersonnetworkpower com Environmental Systems 800 ...

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