Home

Liebert 60Hz User's Manual

1. ve 41 1 P2 Qe oO Du ASSY NO 53616 E c2z US 2 y 5 As O C23 R45 c24 Fal 025 D5 ai R52 c28 PIB tas E R46 a 03M _ 054 GN Manis CO DIC pyy i K1 R39 5V y m Ra9 si lt T TPA 035 Ea YPI My Cia P20 N P P19 NP cg Y1 P21 Pl x Res L S TE 2 c31 R4B R44 CE r Us ceg Di R54 U3 L 5 z so R53 wo pRkz R60 4 TPS TP3 R5 2 R43 L im c16 T id i RaT ot Tr2 Pte aap DS k a Sew LS1 R9 C6 U11 R56 R32 ur RIA Wall Box ct as DIP Switches 1 8 m7 t7 AI R21 D Re v2 c26 P1 amn R59 RHI MO a3 mo R29 R42 ES C2 O O RTI RTO Rae R57 R16 R33R35 44 System Performance Microprocessor Controls 4 0 SYSTEM PERFORMANCE MICROPROCESSOR CONTROLS 4 1 4 2 4 2 1 4 2 2 4 2 3 4 3 4 3 1 4 3 2 Control Type Response Proportional Control The percent requirement is determined by the difference between the return air temperature and the temperature setpoint As the return air temperature rises above the temperature setpoint the per cent cooling required increases proportionally from 0 to 100 over a temperature band equal to the
2. Evaporators and Chilled Water Units Indoor Condensing Units MMD96E AHELO example MCD96ALA00 example MM Mini Mate2 MC Mini Mate2 Indoor Condensing Unit D 0 No Disconnect D 0 No Disconnect D Disconnect D Disconnect 96E 8 ton Evaporator 60 Hz 96A 8 ton Air Cooled Centrifugal 60 Hz 96E 95E 8 ton Evaporator 50 Hz 96A 95A 8 ton Air Cooled Centrifugal 50 Hz 8TCD 8 ton Chilled Water w 2 way valve 98W 8 ton Water Glycol Cooled 60 Hz 8TCT 8 ton Chilled Water w 3 way valve 97W 8 ton Water Glycol 50 Hz A 460V 3ph 60 Hz L Lee temp Head Pressure Control Air Cooled B 575V 3ph 60 Hz 2 2 way Water Glycol reg valve 150 psi A C 208V 3ph 60 Hz L 3 3 way Water Glycol reg valve 150 psi D 230V 3ph 60 Hz D 2 way Water Glycol reg valve 350 psi M 380 415V 3ph 50 Hz T 3 way Water Glycol reg valve 350 psi H 0 No Humidifier A 460V 3ph 60 Hz H Humidifier A B 575V 3ph 60 Hz 0 No Reheat Y 208 230V 3ph 60 Hz E E Electric Reheat M 380 415 3ph 50 Hz S SCR Reheat H 0 No Hot Gas Bypass L L Low Fan Speed Drive 2 hp H Hot Gas Bypass H High Fan Speed Drive 3 hp 0 0 Revision Level 0 None A Filter Clog Prop Fan Condensing Units B Smoke Detector PFCO96A ALO example C Firestat PF Prop Fan Condens
3. Field piping refers to the use of hard piping using sweat adapter kit or precharged line set SL 11088Pg12 32 Site Preparation and Installation 2 9 Checklist for Completed Installation 10 11 12 13 _ 14 15 16 17 18 19 Proper clearance for service access has been maintained around the equipment Equipment is level and lock nuts are installed with the leveling nuts on the spring isolators Piping completed to refrigerant or coolant loop if required Refrigerant charge added if required Condensate pump installed if required Drain line Connected Water supply line connected to humidifier if required Route to allow air filter removal Field provided pan with drain installed under all cooling units and water glycol condensing units Filter box installed Ducting completed Filter s installed in return air duct Line voltage to power wiring matches equipment serial tag Power wiring connections completed and phased correctly between disconnect switch evaporator and condensing unit including earth ground Power line circuit breakers or fuses have proper ratings for equipment installed Control wiring connections completed to evaporator and condensing unit if required including wiring to wall mounted control panel and optional controls Control panel DIP switches set based on customer requirements All wiring connections are tight Foreign materials have be
4. Tower WATER COOLED SYSTEMS Water Glycol Condensing Unit GLYCOL COOLED SYSTEMS Drycooler Q Water Glycol Condensing Unit A Site Preparation and Installation Figure 3 System Configurations chilled water systems COUPLED COMPONENTS AIR COOLED SYSTEM A CHILLED WATER SYSTEMS Condensing Unit i Condensate Pump ee Pi 2 2 System Weights Table 4 Unit weights Cooling Units Ibs kg MMD96E 665 302 MMD95E 665 302 Condensing Units Ibs kg MCD96A 530 241 MCD95A 530 241 MCD98W 470 213 MCD97W 470 213 Add 40 Ibs 20 kg to units with free cooling or hot water reheat coils 2 3 Equipment Inspection upon receipt When the unit arrives do not uncrate equipment until it is close to its final location All required assemblies are banded and shipped in corrugated containers If you discover any damage when you uncrate the unit report it to the shipper immediately If you later find any concealed damage report 1t to the shipper and to your Liebert supplier Site Preparation and Installation 2 4 Installing the Evaporator or Chilled Water Units WARNING Be sure the supporting roof structure is capable of supporting the weight of the unit s and the accessories during installation and service See 2 2 System Weights Be sure to securely anchor the top ends of the suspension rods Make sure all nuts are tight The ev
5. 25 4mm 1 Amm 19 1 2 l 495 3mm Shaded area indicates a recommended clearance of 30 762mm for access 211 2 and filter removal Opti ptional 1 25 4mm 546 1mm Discharge Duct Connection ships with Filter Box 171 2 444 5mm Duct Flange 1198 8mm SA err i 427mm 7 gr eee 25 4mm 203mm EAH 15 5 8 OPTIONAL FILTER BOX 397mm DPN000240_Rev0 16 Site Preparation and Installation 2 4 4 Electrical Connections Evaporator or Chilled Water Unit WARNING Unit contains hazardous electrical voltage Disconnect power supply before working within Line side of factory disconnect remains energized when disconnect is off A WARNING UNIT CONTAINS HAZARDOUS ELECTRICAL VOLTAGE More than one disconnect may be required to remove power Evaporator and condensing units may have separate disconnects Open all disconnects before working within Each unit is shipped from the factory with internal wiring completed Refer to electrical sche matic Figure 11 Figure 25 and Figure 26 when making connections Electrical connections to be made at the installation site are e Power supply to each ceiling unit and control wiring between the evaporator unit and the con densing unit if applicable Control wiring between the control panel wallbox and the evaporator or chilled water unit control board Power Connections All power and control wiring and ground connections must be in accordance with t
6. Electrical Entrance for High Voltage Connection Liquid Line Electrical Entrance for Quick Connect Low Voltage Connection Male Coupling Suction Line System 1 3 Ton Quick Connect Male Coupling System 1 and System 2 on 8 Ton only SL 11081Page7 Model Numbers Electrical Connections In mm Piping Connections In mm 60 Hz 50 Hz A B Cc D E F G PFCO96A L PFCO95A L 2 6 8 1 2 4 3 4 7 3 4 8 1 2 11 1 2 51 152 216 121 197 216 292 26 Site Preparation and Installation 2 7 2 7 1 2 7 2 2 7 3 Indoor Water and Glycol Cooled Condensing Unit Installation Location Considerations The condensing unit may be located above the dropped ceiling or any remote indoor area If noise is of concern the condensing unit should be located away from personnel Normal operating sound may be objectionable if the condensing unit is placed near quiet work areas To mount the unit in the ceiling refer to 2 4 Installing the Evaporator or Chilled Water Units Piping Connections Details for Refrigerant R 22 Loop piping are in 2 4 3 Piping Connections and Coolant Requirements Water Glycol Piping Considerations Refer to Figure 20 for recommended field installed piping hardware such as shut off valves and hose bibs Water filters should be installed if water quality is poor Filters will extend the service life and efficiency of the conde
7. o os 12 General arrangement diagram chilled water systems 0 00 cece eee eee 13 Refrigerant piping diagrama 14 Evaporator or chilled water unit dimensional data 0 0 16 Evaporator unit electrical connections cece e eee e eens 18 Piping connections indoor air cooled centrifugal fan condensing unit 04 20 Indoor air cooled centrifugal condensing unit dimensions and pipe connections 21 Indoor air cooled centrifugal condenser electrical connections 0 000 c eee eee eee 22 Electrical field connections outdoor condensing unit 2 0 ccc cee eens 24 Footprint dimensions outdoor condensing unit 0 0 eee eee ne 25 Piping and electrical connections outdoor condensing unit 0 0 0 ee eee 26 Indoor water glycol condensing unit dimensional data 0 0 c ccc ees 28 Indoor water glycol condensing unit electrical field connections ooooooooo ees 29 System piping with indoor water glycol cooled condensing unit 0 0 0 0 cece eens 30 Optional free cooling coil 8 way valve on water glycol units oooooooooo oo 31 Optional free cooling coil 3 way valve on air cooled units o o ooo ooooooooo 32 Wall Dox a A A SE e EdT 34 Control Meda il ca E A td nas ste nn A A Bs o At ayo valle ua Dai ot 43 Control board inside evaporator 0 0 0 eee e nett een nne 44 Wall box board tant its bd Suess eer Searle j
8. 1 and P39 2 for jumper or N C firestat contact Check pins P40 12 and 1HWAR Com for jumper or N C smoke detector contact No cooling Cooling is not displayed at the control panel Adjust TEMP control setpoint and sensitivity to require cooling Short cycle prevention control Control software delays compressor 3 minutes cooling from stop to start Compressor contactor not pulling in Check for 24 VAC 2 VAC at terminals TB2 to TB1 for Compressor 1 TB6 to TB5 for Compressor 2 If voltage check contactor If voltage check freeze stat FR1 and FR2 Compressor high head pressure See below for cause Plugged filter dryer Replace filter dryer Low refrigerant charge Check pressure gauges At low ambient temperatures proper refrigerant charge is very important on units with Lee Temp receivers Compressor high head pressure Insufficient air flow across condenser coil Remove debris from coil and air inlets Water Glycol Cooled only No fluid flowing through condenser Check fluid supply to regulating valve Adjust valve if necessary Condenser fan not operating Check fan operation Humidifier does not operate DIP switch not set to enable humidifier option See DIP switch settings Table 17 HUMIDIFY not displayed at control panel Increase humidity control setpoint and sensitivity to require humidification Defective board Check vol
9. Liebert part no A 0400 25 x 20 x 4 fil ters NOTE Do not operate the unit without filters installed in return air system Connections for Ducted Systems Use flexible duct work or non flammable cloth collars to attach duct work to the unit and to help con trol the transmission of vibrations to building structures Insulation of duct work is vital to prevent condensation during the cooling cycle The use of a vapor barrier is required to prevent absorption of moisture from the surrounding air into the insulation If the return air duct is short or if noise is likely to be a problem sound absorbing insulation should be used on the duct Duct work should be fabricated and installed in accordance with local and national codes Table 5 Evaporator external static pressure 60 at 3750 CFM 6371 CMH 2 hp Motor std 3 hp Motor opt Turns External External Open RPM Static in RPM Static in 0 n a n a 1146 1 9 0 5 n a n a 1125 1 8 1 n a n a 1104 1 7 15 946 0 9 1083 1 6 2 922 0 8 1063 15 25 972 0 7 1042 1 4 3 899 0 6 1021 1 3 3 5 851 0 5 1000 1 2 4 828 0 4 979 1 1 45 804 0 3 958 1 0 5 780 0 2 938 0 9 5 5 757 0 1 917 0 8 6 733 0 896 0 7 If free cooling or hot water coil is ordered reduce available external static pressure by 0 3 8 mm Contact Liebert Representative for other Air Volumes Factory setting is 0 5 13 mm with 2 hp motor Field adjust to suit application NOTE M
10. short Check or Remedy Increase sensor response delay See 3 12 Calibrate Sensors Display freezes and control pads do not respond Static discharge During period of low humidity static electricity can cause the control program to freeze or display incorrect information Although this is unlikely the control can be reset by cycling power from the disconnect switch Condensate pump does not operate Open or short circuit in wiring Find open or short circuit and repair power to pump Temperature display will indicate dashes Check wiring from Continuous temperature humidity board remote sensors to the control board or Failed temperature sensor Sake See Cooling from control board to wallbox Replace temperature humidity circuit board remote sensors or wallbox Continuous Heating Shorted wiring or failed Dehumidification Humidification control board Check wiring and or replace control board 59 Troubleshooting NOTES 60 Troubleshooting 61 Troubleshooting 62 Ensuring The High Availability Of Mission Critical Data And Applications AAA Emerson Network Power the global leader in enabling business critical Technical Support Service continuity ensures network resiliency and adaptability through _ Web Site a family of technologies including Liebert power and cooling www liebert com Monitoring technologies that protect and
11. 12 midnight is entered 24 00 To change the time press ENTER to select the function then use the UP DOWN arrow to change the first character press ENTER to store then press the UP DOWN arrow key to change the character press ENTER to store etc The real time clock is backed up Date The controller date must be set to allow for setback control To change the date press ENTER then use the UP DOWN arrow to change the first character press ENTER to store press the UP DOWN arrow key to change the second character etc Setback The microprocessor can be programmed for night and weekend setback Two 2 events can be pro grammed for a five day workweek and two 2 events can be programmed for a two day weekend The following table can be used to devise a setback plan Table 11 Night and weekend setback plan Event Weekend Weekday Time 1 Temperature1 Sensitivity 1 Humidity 1 Humidity Sensitivity 1 Time 2 Temperature 2 Sensitivity 2 Humidity 2 Humidity Sensitivity 2 Setup Operation Selecting SETUP OPERATION from the Main Menu will display the following selections RESTART TIME DELAY C F DEGREES HUMIDITY CONTROL METHOD LEAD COMPRESSOR SHOW DIP SWITCH VALVE TIME if valve present CW FLUSH if valve present Use the UP DOWN ARROW to scroll through the submenu Press ENTER to select a particular function Restart Time Delay This function delays unit restart afte
12. FPT Female Water Glycol Hot Gas Bypass 32 54 813mm 1372mm CABINET CABINET DIMENSION DIMENSION Customer supplied threaded rods for module support from ceiling 1 2 diameter minimum recommended typ 4 26 660mm CABINET DIMENSION 9 16 14mm dia hole for module rigging typ 2 each end Shaded area indicates a recommended clearance of 30 762mm be provided for component access and removal 1314mm THREADED ROD THREADED ROD Hanger Bracket CENTERS 1 CENTERS NOTE Unit is evenly spaced in reference to threaded rod centers 24V GND System 1 E 24V Supply System 1 See Detail D High Pressure Alarm System 1 Hot Gas Bypass Connection System 1 only on units with hot gas bypass If no hot gas beta ar a 1 418 29mm dia knockout electrical evaporator module entrance for line voltage connection Connect wire 4 and wire 2 f to the 24V supply Single Point Power Kit 7 8 22mm dia knockout electrical System 2 Outlet Connection Connection System 2 i E only on units with hot See Detail E _ ES Ee gas bypass If no hot gas b ti i dw 1 1 4 32mm FPT Female Water Glyco evaporator module Inlet Connection Connect wire 8 and wire 6 A e to the 24V supply System 1 3Ton Suction Line Connection Aeroquip 11 Male System 2 5Ton Suction Line Connection Aeroquip 12 Male System 1 3Ton Liquid Line Connection pe de Hi
13. Installation Location Considerations To insure a satisfactory air supply locate air cooled propeller fan condensing units in an environment providing clean air away from loose dirt and foreign matter that may clog the coil Condensing units must not be located in the vicinity of steam hot air or fume exhausts or closer than 18 inches from a wall obstruction or adjacent unit Avoid areas where heavy snow will accumulate at air inlet and dis charge locations The condensing unit should be located for maximum security and maintenance accessibility Avoid ground level sites with public access Install a solid base capable of supporting the weight of the condensing unit The base should be at least 2 inches higher than the surrounding grade and 2 inches larger than the dimensions of the con densing unit base For snowy areas a base of sufficient height to clear snow accumulation must be installed Piping Connections Details for refrigerant R 22 loop piping are in Figure 12 Piping connections indoor air cooled centrifugal fan condensing unit Electrical Connections Refer to 2 4 4 Electrical Connections Evaporator or Chilled Water Unit for general wiring requirements and cautions Refer to electrical schematic when making connections Power Connections The outdoor condensing unit requires its own power source and earth ground with a disconnect switch field supplied to isolate the unit for maintenance Control Conne
14. Installation Considerations The evaporator unit is usually mounted above the suspended ceiling using field supplied threaded rods Refer to Figure 1 for possible configurations The condensing unit may be Indoor Air Cooled Centrifugal Fan Condensing Unit mounted remotely or close coupled to the evaporator in the ceiling space Outdoor Air Cooled Propeller Fan Condensing Unit Indoor Water Glycol Cooled Condensing Unit mounted remotely or close coupled to the evapora tor Table 1 Application limits evaporator and chilled water units Input Voltage Range of Return Air Conditions to Unit Min Max Dry Bulb Temp Relative Humidity 65 F to 85 F 20 to 80 ees E10 18 C to 29 C Unit will operate at these conditions but will not control to these extremes Table 2 Application limits indoor and outdoor air cooled condensing units Input Condensing Units Entering Dry Bulb Voltage Air Temperature Min Max Min Max Outdoor Prop Fan Condensing Unit 30 F 34 C 120 F 49 C 5 10 Indoor Air Cooled Centrifugal Condensing Unit 20 F 29 C 115 F 46 C Table 3 Application limits indoor water glycol cooled condensing units Input Voltage Entering Fluid Temperature Min Max Min Max 5 10 65 F 18 3 C 115 F 46 C Operation below 65 F 18 C may result in reduced valve life and fluid noise 2 1 1 Room Preparation The room should be well insulated and must have a sealed vapor barrier The vapor barrier in the ceilin
15. This kit includes the compatible fittings required four suction and four liquid line connections when using field supplied interconnecting refrigerant piping Return Air Filter Box with Duct Collar Kit A return air filter box with duct flange 4 102 mm filter and a supply air duct flange are provided for ducting the evaporator air Condensate Pump Kit A condensate pump is required when the evaporator is installed below the level of the gravity fed drain line Components include the pump check valve sump level sensor float switch and controls Refer to detailed instructions and drawings supplied with the pump Remote Monitoring and Control Liebert can provide a variety of remote monitoring and control devices to enhance your Mini Mate2 system These include water detection remote monitoring of a single unit and remote control moni toring of multiple units Remote Sensors Remote temperature humidity sensors can be mounted in the controlled space or in duct work and includes 30 feet of control cable Site Preparation and Installation 2 0 SITE PREPARATION AND INSTALLATION NOTE Before installing unit determine whether any building alterations are required to run piping wiring and duct work Carefully follow all unit dimensional drawings and refer to the submittal engineering dimensional drawings of individual units for proper clearances 2 1
16. available from Liebert or others Heat Rejection Connection Field supplied 24V NEC Class 2 wiring TB1 10 See note 2 Optional Remote Sensor Remote Unit Shutdown Use field supplied Connection P16 1 2 3 4 24V Class 2 wire Replace existing jumper SA between TB37 amp TB38 with NC switch having a minimum 75 VA rating Bees 17 Remote Humidifier Contact Field Supplied 24V class 2 Site Monitoring Connection wiring 9 terminals 11812 A located in field wire Terminals TB78 TB77 are for compartment connection of a 2 wire twisted pair i communication cable to optional L Optional Main Fan Auxilary sitescan Electric service Side Switch TB84 85 not by Liebert Field supplied 24V Class 2 wire Field supplied unit disconnect switch gt when factory unit disconnect switch is not supplied Entrance for customer high volt connections NOTES 1 Refer to specification sheet for full load amp and wire size amp ratings 2 Control voltage wiring must be a minimum of 16 GA 1 6mm for up to 75 23m or not to exceed 1 volt drop in control line Electrical entrance for optional condensate pump on left side of unit ff Optional Single Point Power Kit Field supplied field wired thermostat wire to remote wall box Entrance for customer low voltage connections Entrance for customer low voltage connections Field supplied 24V NEC Class2 wiring to
17. coupling halves together by hand to insure that the threads mate properly Ol ee 0 BS Tighten the coupling body hex nut and union nut with the proper size wrench until the coupling bodies bottom out or until a definite resistance is felt Using a marker or pen make a line lengthwise from the coupling union nut to the bulkhead Tighten the nuts an additional quarter turn the misalignment of the lines shows how much the coupling has been tightened This final quarter turn is necessary to insure that the joint will not leak Refer to Table 9 for torque requirements Table 9 Refrigerant quick connect sizes and torque Size O D Cu Coupling Size Torque lb ft 3 8 6 10 12 1 2 10 35 45 7 8 11 35 45 1 1 8 12 50 65 15 Site Preparation and Installation Figure 10 Evaporator or chilled water unit dimensional data Customer Supplied threaded rods for module support from ceiling 1 2 minimum diameter recommended typ 4 54 1 8 1375mm 13 16 CABINET DIMENSION 15 5 8 2 Air Outlet 397mm 9 16 14mm dia holes for threaded rods typ 2 each end 16 13 16 427mm Air Inlet 26 1 2 j 673mm PE 19 1 2 B N 495mm PSs 7 25 4mm 50 1270mm 70 1778mm Hanger Bracket 72 p 1828 8mm 50 Shaded area indicates a 1270mm recommended clearance of 30 762mm for access 4 and filter removal 25 4mm 49 4 1244 6mm
18. desired humidity 6 1 6 Remote Shutdown A connection point is provided for remote shutdown devices supplied by the customer This terminal strip is located in the electric panel Terminals 37 and 38 are fitted with a jumper when no remote shutdown device is installed 50 System Operation Testing and Maintenance 6 2 6 2 1 6 2 2 6 2 3 Maintenance and Component Operation Electric Panel The electric panel should be inspected on a semi annual basis for any loose electrical connections Filters Filters are usually the most neglected item in an environmental control system In order to maintain efficient operation they should be checked monthly and changed as required ALWAYS TURN POWER OFF BEFORE REPLACING FILTERS Filters are replaced by opening the hinged door on the return air filter box Blower System Monthly inspection of the blower package includes motor mounts belts fan bearings and impellers Fan impellers should be thoroughly inspected and any debris removed Check to see if they are tightly mounted on the fan shaft and do not rub against the fan housing during rotation Motor and fan bear ings are permanently sealed and self lubricating and do NOT need lubricated The drive belt should be checked monthly for signs of wear and proper tension Pressing on belts mid way between the sheave and pulley should produce from 1 2 to 1 12 to 25 mm of deflection Belts that are too tight can cause excessiv
19. samples at time of installation and every six 6 months should help to establish a pattern of depletion A visual inspection of the solution and filter residue is often helpful in judging whether or not active corrosion is occurring The complexity of problems caused by water requires expert advice from a water treatment specialist plus a regular maintenance program schedule It is important to note that improper use of water treatment chemi cals can cause severe problems Proper inhibitor maintenance must be performed in order to prevent corrosion of the glycol system Consult your glycol manufacturer for proper testing and maintenance procedures Do not mix prod ucts from different manufacturers Hot Gas Bypass Optional Operation The hot gas bypass valve is installed between the compressor discharge piping and suction piping bypassing the condenser and evaporator coils The discharge gas mixes with the suction gas raising the suction temperature and pressure and decreasing the mass flow through the evaporator The higher suction temperatures could cause compressor overheating therefore a separate liquid quench ing valve is provided to mix refrigerant from the system liquid line with the discharge gas before mix ing with the suction gas entering the compressor During normal operation when the evaporator is under full load the hot gas bypass equalizer pres sure will remain high enough to keep the valve port closed If the evaporator loa
20. side or underneath the condenser At the same time check for bent or damaged coil fins and repair as necessary Check all refrigerant lines and capillaries for vibration and support as necessary Carefully inspect all refrigerant lines for signs of oil leaks Coaxial Condensers Water Glycol Cooled Condensing Units Each water or glycol cooled condensing unit has a coaxial condenser consisting of an exterior steel tube and an interior copper tube If the water supply is clean coaxial condensers do not normally require maintenance or replacement Should your system begin to operate at high head pressure with reduced capacity and all other causes have been eliminated the condenser may be obstructed or fouled and should be replaced 52 System Operation Testing and Maintenance Regulating Valves Water Glycol Condensing Units The water regulating valve automatically regulate the amount of fluid necessary to remove the heat from the refrigeration system permitting more fluid to flow when load conditions are high and less fluid to flow when load conditions are low The water regulating valve is designed to begin opening at 180 psi 1240 kPa and be fully opened at 240 psi 1655 kPa The valve is factory set and should not need adjustment Glycol Solution Maintenance It is difficult to establish a specific schedule of inhibitor maintenance since the rate of inhibitor deple tion depends upon local water conditions Analysis of water
21. temperature sensitivity plus 1 degree Fahrenheit The heating requirement is determined in a simi lar manner as the temperature decreases below the setpoint With this control type the temperature at which the room is controlled increases as the room load increases At full load the room would be controlled at a temperature equal to the setpoint plus the sensitivity Cooling Multi Step Cooling Compressorized Direct Expansion DX Systems The system will use the 3 ton compressor 1 and 5 ton compressor 2 compressors in an 8 ton sys tem The control will determine the average cooling requirement updated every hour and select the lead compressor or the user can select the lead compressor through the Setup Operation menu At startup the 3 ton compressor will be the lead compressor The compressors will be staged on with hot gas bypass energized at 50 and 100 cooling requirements The compressors will turn off at 75 and 25 requirements Chilled Water Cooling 8 Ton The chilled water control valve is adjusted proportionally as the temperature control varies the requirement for cooling from 0 to 100 This is based on the full valve travel time programmed in the Setup Operation menu GLYCOOL Cooling 8 Ton When GLYCOOL is available the temperature control will calculate a total cooling requirement of 200 Assuming that full GLYCOOL capacity is available the GLYCOOL valve opens proportionally as the requirement for cool
22. the building by the use of vibration isolating supports To prevent tube damage when sealing openings in walls and to reduce vibration transmission use a soft flexible material to pack around the tubes When installing remote condensing units above the evaporator the suction gas line should be trapped at the evaporator This trap will retain refrigerant oil in the off cycle When the unit starts oil in the trap is carried up the vertical riser and returns to the compressor Table 6 Recommended refrigerant line sizes Equivalent Suction Feet Circuit Liquid Line Line 50 feet 3 ton 3 8 O D 7 8 O D 100 feet 3 ton 1 2 O D 7 8 O D 150 feet 3 ton 5 8 O D 1 1 8 O D 50 feet 5 ton 1 2 O D 1 1 8 O D 100 feet 5 ton 5 8 O D 1 1 8 O D 150 feet 5 ton 5 8 O D 1 3 8 O D Consult your Liebert representative for longer line lengths NOTE If field supplied refrigerant piping is installed refrigerant R 22 must be added to the system Figure 9 Refrigerant piping diagram Pitch down 1 2 per 10 feet Evaporator NOTE When installing remote condensing units below the evaporator the suction gas line should be trapped with an inverted trap to the height of the evaporator This prevents refrigerant migration to the compressors during off cycles Maximum recommended vertical drop to condensing Suction Line Piping unit is 20 feet 6 1 m Condensing Unit Below Evaporator Condensing Unit Co
23. 0 The flush cycle is active even when the fan is turned off but power is applied to the unit When the interval timer reaches the programmed time the valve will be opened for 3 minutes to flush any contaminates which may have collected in the system Table 12 Setup functions default values and allowable ranges Function Default Range Restart Time Delay 0 1 0 es a rt C F Degrees F C or F Humidity Control Rel Relative or Absolute Valve Time 165 50 to 250 sec s CW Flush 24 0 to 99 hours Change Passwords The display will prompt the operator to enter a three digit password when attempting to make changes The system includes two 2 passwords one for setpoints and one for setup The system allows the password to be changed by first entering the default password set at the factory 1 2 3 for setpoints and 3 2 1 for setup The password function provides system security so that only autho rized personnel are allowed to make changes to the system If unauthorized changes are being made the passwords may be compromised and new ones should be selected The password function can be disabled by setting DIP switch 8 in the wallbox to OFF then resetting power to the unit Calibrate Sensors The temperature and humidity sensors can be calibrated by selecting the CALIBRATE SENSORS menu item The temperature sensor can be calibrated 5 F while the humidity sensor can be cali brated 10 RH When calibrating
24. 1 Electro Panel ty ice aie e a ae arg arti Go ghee a 51 A A RARA RAR 51 623 S Blower Oyster to id a ote TS A e DS 51 6 24 El ctric Reheat sc a da oc Sxl ewe 52 6 2 5 Refrigeration System siner emeu O ned hae ae ii oS 52 6 2 6 Steam Generating Humidifier Operation Procedures 0 00 eee eens 55 6 2 7 Circuit Board Adjustments 0 0 0 0 cence een eee ens 56 MAINTENANCE INSPECTION CHECKLIST 00 cc eee eee ee eee eee eee ees 57 TROUBLESHOOTING 4 fie bb eb Oe eed ed he a es 58 iii Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Table i Table 11 Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 FIGURES System configurations air cooled systems 6 System Configurations water glycol systems 0 eee eens 6 System Configurations chilled water systems 0 cc eee teens 7 Threaded rod and hardware kit installati0N ooooooooooooororrrr eens 8 Close coupl ed installations 2 srode u tE saa iad eal A bose eds 9 Drarnranstallationt ss ito e cet aches a o oe os cia sete a Socata sect ear eat tna 11 Condensate pump installati0N
25. 3_REV2_02 07 Emerson Network Power The global leader in enabling Business Critical Continuity EmersonNetworkPower com FM AC Power HI Embedded Computing I Outside Plant HI Racks amp Integrated Cabinets HI Connectivity HI Embedded Power HI Power Switching amp Controls E Services MH Dc Power I Monitoring HI Precision Cooling I Surge Protection 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
26. H Precision Cooling For Business Critical Continuity Liebert Mini Mate2 User Manual 8 Tons 50 amp 60Hz A W Liebert EMERSON Network Power TABLE OF CONTENTS MODEL NUMBER NOMENCLATURE 00 0c eee eee ee eee ee ee eee eee eee eee ee ee eee V 1 0 PRODUCT FEATURES A A O e LAS 1 1 1 Standard Product Features oooooooooororro eee ne ne ne nen eee eee ens 1 LET SCOntrols ete se we ate sctto E a E EN gee a 1 1 1 2 Evaporator System Components 1 1 1 3 Condensing Unit Components 1 1 2 Optional Equipment 2 124 Canister Humide sie A is stata les ahi eens Allene A n 2 1 2 25 Wlectric Reh Gates ra a he seine sy Wag oe te bcos Dehn sales A Eb 2 13233 SCR Electric Reedici n ied 2 1 2 4 Hot Gas Bypass Condensing Units 2 1 2 5 Free Cooling Coil GLYCOOL 00000 eee e een ne ees 2 12 6 Smoke Detectors 23 24 dina od ona ts 24 Db eth doh a a Rd ra tt ds bashed Be 2 EDT Firestation ee ae ee ee a 2 12 80 alter io o AT E AO eee Wi ig eS REESE Ei 2 1 3 Ancillary Ship Loose Accessories 0 ccc ee eee ee eee ee een eens 3 13 1 Single Pomt Pow er Kits 6s A Gk Caen Gd Mab lS leew lah testes Secs 3 1 3 2 Refrigerant Line Sweat Adapter Kits 0 0 0 eee eens 3 1 3 3 Return Air Filter Box with Duct Collar Kit 0 0 0 0c 3 1 3 4 Condensate Pump Kit ud a a a Grd fed MAE hee Bn ee ee Se Fo bd be ds 3 1 3 5 Remote Monitoring and Control 3 13 6 Remote Seniors erdan A AN P
27. IME DATE SETBACK SETUP OPERATION SETPT PASSWORD SETUP PASSWORD CALIBRATE SENSOR ALARM ENABLE ALARM TIME DELAY COM ALARM ENABLE CUSTOM ALARMS CUSTOM TEXT DIAGNOSTICS end of MENU Use the UP DOWN arrow to scroll through the selections then when ready to select a particular function press ENTER 35 Microprocessor Control 3 3 3 4 3 5 3 6 Setpoints Setpoints and system setup parameters are kept in nonvolatile memory Selecting SETPOINTS from the Main Menu will display the following selections TEMPERATURE SETPOINT TEMPERATURE SENSITIVITY HUMIDITY SETPOINT HUMIDITY SENSITIVITY HIGH TEMPERATURE ALARM LOW TEMPERATURE ALARM HIGH HUMIDITY ALARM LOW HUMIDITY ALARM Scroll through this sub menu by using the UP DOWN arrow then press ENTER to select a particu lar function To change a value press ENTER and use the UP DOWN arrows When the value has been changed press ENTER to store the value For example to change the temperature setpoint from the main status display 1 Press MENU key to display main menu 2 Scroll to SETPOINTS using the UP DOWN arrow key Press ENTER 3 Scroll to TEMP SETPT using the UP DOWN arrow key Press ENTER 4 Use the UP DOWN arrow to change the value Press ENTER Table 10 Default setpoints and allowable ranges Setpoint Default Range Temperature Setpoint 72 F 40 90 F 5 32 C Temperature Sens
28. PANEL 1 Check Fuses 2 Check Electrical Connections 3 Check Operation Sequence 4 Check Contactors for Pitting COMMENTS 1 Check Test Changeover Panel 2 Check Test Water Detection 3 Check Test Condensate Pump Operation 4 Check Verify Control Settings AIR COOLED CONDENSER DRYCOOLER 1 Coil Clean 2 Motor Mounts Tight 3 Bearings in Good Condition 4 Piping in Good Condition 5 Ambient Settings 6 T 8 Motor Amp Draws Check Electrical Connections Refrigerant Glycol Level 9 Cap Tubes Not Rubbing WATER GLYCOL CONDENSER ___ 1 Copper Tube Clean __ 2 Water Regulating Valve Functions 3 Glycol Solution ___ 4 Check for Water Glycol Leaks GLYCOL PUMP 1 Pump Rotation 2 Glycol Leaks 3 Pump Operation 4 Amp Draw 5 Pump Changeover If Dual 57 Troubleshooting 8 0 TROUBLESHOOTING Table 18 Troubleshooting Symptom Unit will not start Possible Cause No power to unit Check or Remedy Check voltage at input terminal block Control voltage fuses at transformer open Locate and repair short Replace fuses Float switch relay has closed due to high water in the condensate pan Check drain and line Access through left panel Power must be cycled at the disconnect to reset Check return air static pressure is less than 0 3 wg Jumper not in place Check terminal 37 and 38 for jumper or N C contact Check pins P39
29. Rb cack bate tense he A EP en a E 38 321025 Show DIP Swit Ch peice gto A eee ea scious A Boe Le EA EO E ATEOA 38 3 10 6 Valve Time For Systems With a Modulating Chilled Water Valve 38 3 10 7 CW Flush For Systems With a Modulating Chilled Water Valve 39 Change Passwords ula yd ii tne ea eens EE ER AE eg Ah Read fed 39 Calibrate Sen SKS 5 525 cas hooey bk a ho SERGE Vs SEES E OER iS 39 AlarmikBnable riada teat died AAG does 39 Alarm Time Delay ias sats E A HER a bela nae Bla SRA A 40 Common Alarm Enable 40 Customs Ala rings tii A es eee a aS island DO is Ree a we 40 Custom Pex tists Gia A BAA OR BAe A RAEI ARS Gs SENT 41 R n Diagnostics ses winches ops a ars aden a oD ee RE OE ERTS ARES 42 SYSTEM PERFORMANCE MICROPROCESSOR CONTROLS 0 eee eeeeeeueueuaes 45 Control Type Response Proportional Control 0 0 0 0 c cee eens 45 COOLS Ay Ast de ee taa e la e y ta ca e e ai e Cl A Se a AL Bs O 45 4 2 1 Multi Step Cooling Compressorized Direct Expansion DX Systems 45 4 2 2 Chilled Water Cooling 8 TM 45 42 3 GLY COOL Coolin 8 Ton ii Rd a Pas eee Beene hee 45 4 3 4 4 4 5 4 6 5 0 5 1 5 2 6 0 6 1 6 2 7 0 8 0 4 3 1 Electric Reheat Staged ce eee eee nen eee nes 45 4 3 2 SCR HlectricRehe atiiccc ios hi hh ee hh dae Pa eee bia eed 45 Dehumidification Humidification Percent Required 0 ees 46 4 4 1 Staged Dehu
30. air temperature and the temperature setpoint Unnecessary dehumidification can result when overcooling occurs during a dehumidification cycle This is due to a higher than normal RH reading caused by overcooling the room about 2 RH for each degree of overcooling This drop in temperature extends the dehumidification cycle Later when the dehumidification ends and the temperature rises to the setpoint the RH reading falls The final RH reading will then be lower than actually desired If the temperature drop was significant enough the percentage RH could be low enough to activate the humidifier If the absolute humidity control is selected over dehumidification may be avoided When overcooling occurs 1 e causing an increase in the RH reading the humidity control program estimates what the RH will be when the dehumidification cycle ends and temperature returns to the setpoint This allows the dehumidification cycle to end at the proper time Predictive humidity control can greatly reduce energy consumption by minimizing both compressor reheat operation Use the UP DOWN ARROW key to select the desired humidity control method Lead Compressor This function allows the user to select which compressor is the lead Compressor 1 3 ton Compres sor 2 5 ton or Auto The factory default is Auto If Auto is selected the control will determine which compressor is to be the lead compressor based on the average room load over the previous one hour o
31. anels Connection Terminal for Field Supplied Earth Grounding Wire Optional Factory Installed Disconnect Switch Heat rejection connectianField supplied 24V NEC class 2 wiring See note 2 Wire connections from evaporator module 1 24V GND System 1 2 24V Supply System 1 3 High Pressure Alarm System 1 4 Hot Gas Bypass Connection System 1 only on units with hot gas bypass If no hot gas bypass connection is provided in the evaporator module Connect wire 4 and wire 2 to the 24V supply 5 24V GND System 2 6 24V Supply System 2 7 High Pressure Alarm System 2 8 Hot Gas Bypass Connection System 2 only on units with hot gas bypass 4 If no hot gas bypass connection is 101 6mm provided in the evaporator module Connect wire 8 and wire 6 to the LowVoltageElectric Power Supply Conduit Entrance bs Mi Openings for Field Supplied 7 24V NEC Class 2 Wiring Between Condensing Unit and Fan Coil Unit 6 152 4mm NOTES 317 5mm 161 2 419 1mm 1 Refer to specification sheet for full load amp and wire size amp ratings 2 Control voltage wiring must be a minimum of 16 GA 1 6mm for up to 75 23m or not to exceed 1 volt drop in control line 81 2 24V supply 215 9mm 9 24V GND Condenser Fan 121 2 10 24V SUPPLY Condenser Fan DPN000249_Rev0 22 Site Preparation and Installation 2 6 2 6 1 2 6 2 2 6 3 Outdoor Air Cooled Condensing Unit
32. aporator unit and indoor condensing unit are usually mounted above the ceiling and must be securely mounted to the roof structure The ceiling and ceiling supports of existing buildings may require reinforcements Be sure to follow all applicable codes Use field supplied 1 2 13 tpi threaded suspension rods and 1 2 13 tpi hardware kit Recommended clearance between ceiling grids and building structural members is unit height plus 3 inches Install the four field supplied rods by suspending them from suitable building structural members Locate the rods so that they will align with the four mounting holes in the flanges that are part of the unit base Using a suitable lifting device raise the unit up and pass the threaded rods through the four mount ing holes in the flanges that are part of the unit base Attach the threaded rods to the unit flanges using the supplied springs and washers See Figure 4 The coil springs provide vibration isolation 1 Use the plain nuts to hold unit in place Adjust these nuts so that the weight of the unit is supported by the four rods does not rest on the ceiling grid and is level Ensure none of the springs are compressed to solid height The coil side of the unit is heavier so these springs will be compressed more than the other side NOTE The units must be level in order to drain condensate properly 2 Use the Nylock nuts to jam the plain nuts Figure 4 Threaded rod and hardware kit ins
33. arm select the alarm you would like to change 1 2 or 3 Using the UP DOWN arrows step through the list of seven standard alarm messages listed below and two custom alarms Select the alarm message desired and store it by pressing ENTER SMOKE DETECTED CUSTOM 2 CUSTOM 3 STANDBY GC PUMP WATER FLOW LOSS STANDBY UNIT ON CUSTOM 1 40 Microprocessor Control 3 17 Custom Text To modify the two custom alarm messages select CUSTOM TEXT Then select Custom Text 1 Custom Text 2 or Custom Text 3 Text can be up to 16 characters in length and can be either a blank space or any of the following alphanumeric characters and symbols A B C D E F G H LJ K L M N O P Q R S T U V W X Y Z 7 0 1 2 3 4 5 6 7 8 or 9 Use the UP DOWN arrows to select a character then press ENTER The cursor will move to the next space where you may once use the UP DOWN arrows to select another character etc The cus tom text alarm will be displayed only if the alarm is selected in Custom Alarms LCD Display Contrast The level of contrast due to the viewing angle of the LCD display can be adjusted using a potentiome ter screw inside the wall box next to the display Nonvolatile Memory All critical information is stored in nonvolatile memory Setpoints and setup parameters are kept inside the microcontroller in EEPROM Equipment Options Switches Equipment options are selected and enabled using DIP switc
34. aximum return air static pressure should not exceed 0 3 8 mm to provide proper drainage of the unit 10 Site Preparation and Installation 2 4 3 Piping Connections and Coolant Requirements Drain Line A CAUTION The drain line must not be trapped outside the unit or water may back up in drain pan Drain is internally trapped This line may contain boiling water Use copper or other suitable material for the drain line Sagging condensate drain lines may inadvertently create an external trap A 3 4 in 19 1 mm female pipe thread FPT connection is provided for the evaporator coil condensate drain This line also drains the humidifier if applicable The drain line must be located so it will not be exposed to freezing temperatures The drain should be the full size of the drain connection The evaporator drain pan includes a float switch to prevent unit operation if drain becomes blocked Figure 6 Drain installation Do not externally trap the unit Continuous slope away from unit Correct Incorrect These are external traps also although unintentional Lines must be rigid enough to not bow between supports Humidifier drain water can approach 100 Celsius Incorrect 11 Site Preparation and Installation Condensate Pump The optional condensate pump kit is required when the evaporator is installed below the level of the gravity fed drain line Refer to the installation instruc
35. condensing unit if applicable DPN000244_Rev0 18 Site Preparation and Installation 2 5 2 5 1 2 5 2 Indoor Air Cooled Centrifugal Fan Condensing Unit Installation Location Considerations The centrifugal fan air cooled condensing unit may be located above the dropped ceiling or any remote indoor area If noise is of concern the condensing unit should be located away from personnel Normal operating sound may be objectionable if the condensing unit is placed near quiet work areas To mount the unit in the ceiling refer to 2 4 Installing the Evaporator or Chilled Water Units for hanging guidelines and to Figure 13 for dimensional data Ducting Fan operation is designed for 5000 CFM 8495 CMH at 0 5 external static pressure General Considerations Use flexible duct work or nonflammable cloth collars to attach duct work to the unit and to control vibration transmission to the building Attach the duct work to the unit using the flanges provided Locate the unit and duct work so that the discharge air does not short circuit to the return air inlet Duct work that runs through a conditioned space or is exposed to areas where condensation may occur must be insulated Duct work should be suspended using flexible hangers Duct work should not be fastened directly to the building structure For multiple unit installations space the units so that the hot condensing unit exhaust air is not directed toward the air inlet of an adjac
36. cs Wknd Hsens 1 Chng Fitr Fan Ovrld End of Menu Wknd Time 2 Loss Air EOSS EN On Off Custom 1 Wknd Temp 2 Custom 2 Custom Alarms Wknd Tsens 2 Custom 3 Custom Alarm 1 Wknd Humd 2 High Temp Custom Alarm 2 Wknd Hsens 2 Low Temp Custom Alarm 3 Wkdy Time 1 High Hum On Off Low Hum Custom Text Wkdy Temp 1 Short Cyc1 Custom Text 1 Wkdy Humd 1 Short Cyc2 Custom Text 2 Wkdy Hsens 1 Fan Ovrld Custom Text 3 Wkdy Time 2 Loss Pwr On Off Diagnostics Wkdy Temp 2 Test Outputs Wkdy Tsens 2 Test Inputs Wkdy Humd 2 Test Microcontroller Wkdy Hsens 2 43 Microprocessor Control Figure 25 Control board inside evaporator O P32 O P40 P34 O P35 P22 P38 P39 P3 P2 on Sooo ooo O ie ps O reas Connection to Terminal 4 Wallbox 7 TB3 3 Connection to Terminal 3 Wallbox 5 1TB3 2 Connection to Terminal 2 Wallbox o GND TB3 1 Connection to Terminal 1 Wallbox O Pl P4 P16 Remote Sensor Connection G2 G3 Figure 26 Wall box board TB3 1 TB3 2 TB3 3 TB4 4 u12 c34
37. ct power 2 Attach suction and discharge gauges to access fittings 3 Recover refrigerant using standard recovery procedures and equipment NOTE Release of refrigerant to the atmosphere is harmful to the environment and unlawful Refrigerant must be recycled or discarded in accordance with federal state and local regulations 4 Remove failed compressor 5 Install replacement compressor and make all connections Pressurize and leak test the system at approximately 150 psig 1034kPa pressure 6 Follow manufacturer s instructions for clean out kits 7 Evacuate the system twice to 1500 microns and the third time to 500 microns Break the vacuum each time with clean dry refrigerant to 2 psig 13 8 kPa 8 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 9 Apply power and operate the system Check for proper operation Refer to Table 16 for discharge pressure 54 System Operation Testing and Maintenance 6 2 6 Steam Generating Humidifier Operation Procedures Steam generating humidifiers operate efficiently over a wide range of water quality conditions and automatically adjust to changes in the conductivity of water The system will automatically drain and refill to maintain a current setpoint and alert the operator when the humidifier canister needs to be replaced The humidifier RUN DRAIN switc
38. ctions Field supplied control wires must be connected between the evaporator and the condensing unit See Figure 6 and the electrical schematic on the units for more details Seven 7 wires are required between the evaporator and condensing unit Eighth and ninth wires are required on systems with hot gas bypass 23 Site Preparation and Installation Figure 15 Electrical field connections outdoor condensing unit Field supplied unit disconnect switch Single or three phase ae electric service not provided by Liebert Field supplied 24V NEC class 2 wiring to evaporator module Electric service connection to contactor or terminal block Factory wired to components on electric panel Single or three phase electric service not _____ ifa provided by Liebert High voltage ee electric power supply entrance Heat rejection connection Field rae voltage supplied 24V NEC class 2 wiring ee ae Suppiy Wire connections from evaporator module 1 24V GND System 1 2 24V Supply System 1 3 High Pressure Alarm System 1 4 Hot Gas Bypass Connection System 1 only on units with hot gas bypass If no hot gas bypass connection is provided in the evaporator module Connect wire 4 and wire 2 to the 24V supply 5 24V GND System 2 6 24V Supply System 2 7 High Pressure Alarm System 2 8 Hot Gas Bypass Connection System 2 only on units with hot gas bypass If no hot gas bypass co
39. d be replaced 6 After the entire electrode surface has been coated the output will slowly decrease During these last hours of electrode life the mineral concentration can increase and arcing can occur If the electrodes start to arc turn off the humidifier immediately and replace the canister with the identical part 55 System Operation Testing and Maintenance 6 2 7 Replacing the Humidifier Canister The proper procedure to replace the humidifier canister is 1 Turn off the humidifier by lowering the humidity setpoint below the ambient humidity level Record the original setpoint Turn unit off at wallbox Place the RUN DRAIN switch in the DRAIN position to drain the water from the canister Return the RUN DRAIN switch to the RUN position after the canister has drained Turn OFF the power at the main unit Remove the cover from the humidifier cabinet Locate the power wires to the steam canister They are connected to the canister with 1 4 quick connects Make note of the wiring configuration before removing any wires Refer to schematic on unit Slide the rubber boot back to expose the connections Remove the three 3 power wires and the canister full wire Do not loosen the screws that secure the electrodes A WARNING Canister and steam hose may be hot Allow time for the humidifier to cool before replacing parts NDAN 8 Loosen the steam outlet hose clamps and slide the steam hose away from the canister fi
40. d decreases the evap orator temperature and pressure will drop When the suction pressure reduces below the hot gas bypass valve setting the hot gas bypass valve opens diverting some of the refrigerant flow back to the compressor suction The liquid quenching valve bulb senses this increased superheat and opens allowing liquid refrigerant to mix with the discharge gas desuperheating it Proper mixing of the three refrigerant paths ensures stable operation and system performance The liquid quenching valve bulb must be located downstream of all these connections to control superheat at the compressor inlet Superheat settings for the liquid quenching valve are chosen to maintain con sistency with the system expansion valve During hot gas bypass operation higher superheats 25 40 F 14 22 C may be observed at the compressor The liquid quenching valve is internally equal ized and superheat is not adjustable Adjustment 1 Install the suction and discharge pressure gauge 2 Adjust temperature setpoint to call for cooling so that the refrigeration compressor will run continuously 3 Remove the TOP adjusting nut from the valve 4 Insert an Allen wrench in the brass hole at top of valve in adjusting port and turn CLOCKWISE if a higher evaporator temperature is required Adjust no more than 1 4 turn at a time Let the system stabilize for 15 minutes before determining if additional adjustment is necessary 5 After obtaining the sucti
41. dling contaminated parts Check all fuses and circuit breakers Check pressure switch operation Ifa compressor failure has occurred determine whether its cause is an electrical or mechanical problem A CAUTION System contains refrigerant Recover refrigerant before maintenance Mechanical Failure If you have determined that a mechanical failure has occurred the compressor must be replaced Electrical Failure In the event of an electrical failure and subsequent burnout of the refrigeration com pressor motor proper procedures must be followed to thoroughly remove any acids that would cause a future failure There are two kits that can be used with a complete compressor burnout Sporlan System Cleaner and Alco Dri Kleener Follow the manufacturer s procedure DAMAGE TO A REPLACEMENT COMPRES SOR DUE TO IMPROPER SYSTEM CLEANING CONSTITUTES ABUSE UNDER THE TERMS OF THE WARRANTY THEREBY VOIDING THE WARRANTY Replacement compressors are available from your Liebert supplier and will be shipped to the job site in a reusable crate as required by the service contractor If the compressor is under warranty it must be returned to Liebert in order to receive proper warranty credit It should be returned in the same container the replacement was shipped in The possible cause s or condition s of the damage should be legibly recorded on the provided return tag Proper procedures to remove and replace the failed compressor are 1 Disconne
42. e 8 ton unit is disabled at 125 first stage and 200 all stages heating requirement Dehumidification is re enabled at 66 and 33 heating requirement Load Control Features The control system monitors the compressor and prevents it from turning on within a 38 minute period of being off If this on off cycle occurs to often e g 10 times within a one hour period a Short Cycle Alarm will occur Communications The control system uses a two wire RS 422 channel to communicate with Liebert Site Products via a proprietary protocol A converter board ECA2 is available to allow communications with a dumb terminal or a computer using RS 232 channel More details are provided in the Site Products and ECA2 User Manual The communications channel provides both monitoring and control options including TEMPERATURE HUMIDITY Current temperature and humidity readings STATUS Cooling heating and humidify dehumidify operating status PRESENT ALARMS Alarms currently activated SETPOINTS Temperature Setpoint Temperature Sensitivity e Humidity Setpoint e Humidity Sensitivity High Temperature Alarm Low Temperature Alarm High Humidity Alarm Low Humidity Alarm ON OFF STATUS and CONTROL SILENCE ALARM 46 Alarms 5 0 ALARMS 5 1 The microprocessor control system will audibly and visually signal all ENABLED Alarms including two 2 custom alarms These special alarms can be chosen f
43. e bearing wear Belt tension can be adjusted by raising or lowering the fan motor base Loosen nut above motor mounting plate to remove belt Turn nut below motor mounting plate to adjust belt tension If belt appears cracked or worn it should be replaced with a matched belt identically sized With proper care a belt should last several years NOTE After adjusting or changing the belt always be certain that motor base nuts are tightened The bottom adjustment nut should be finger tight The top locking nut should be tightened with a wrench Air Distribution Since all unit models are designed for constant volume air delivery any unusual restrictions within the air circuit must be avoided High efficiency filters can reduce air performance and evaporator capacity Blower Removal Evaporator If the blower or bearings must be removed or serviced use the following procedure 1 Prepare the main center section of the three 8 piece electric panel by first marking and disconnecting all power and control wiring entering the panel Remove the electric panel by removing screws from top and bottom sections Remove the bottom electric panel mounting flange from unit base Remove the belt motor motor mounting plate and tensioning bolt Remove the four 4 screws holding the blower mounting rails to the sled CAUTION Protect refrigerant and water piping from damage Cee Coy BS 6 Remove the 4 screws holding the blower mount
44. ecise temperature control while cool ing is locked on A safety switch prevents the reheat from exceeding temperature limits Hot Gas Bypass Condensing Units This optional system bypasses compressor discharge around the condenser directly to suction to pro vide capacity control and reduce compressor cycling System includes liquid injection valve to main tain proper suction superheat Hot gas bypass is provided on both circuits Free Cooling Coil GLYCOOL When ambient temperatures are low enough cold fluid is piped to a secondary coil or a separate source of chilled water may be piped to this coil Smoke Detector If smoke is detected in the return air the unit display sounds an audible signal and the unit shuts down Firestat When the return air temperature limit of approximately 125 F 51 7 C is exceeded the unit shuts down Filter Clog If high pressure differential is detected across the return air filter an adjustable pressure differential switch sounds an audible signal Product Features 1 3 1 3 1 1 3 2 1 3 3 1 3 4 1 3 5 1 3 6 Ancillary Ship Loose Accessories Single Point Power Kit A Single Point Power Kit allows the connection of a system Evaporator and indoor condensing unit to a single power source when the units are close coupled The kit includes a junction box with power distribution sub fusing and evaporator and condenser wiring Refrigerant Line Sweat Adapter Kits
45. ectively turned off When stepping from one load to the next the previous load is automatically turned off The loads can also be toggled on off by selecting ENTER Once turned on the output will remain on for five minutes unless toggled off or the test outputs function is exited by selecting MENU ESC Compressor is limited to 15 sec onds on to prevent damage A CAUTION Testing compressor output for more than a few seconds could damage the compressor To eliminate damaging the compressor during testing DO NOT test compressor output for more than a few seconds A CAUTION Extended unit operation in the test outputs mode for troubleshooting may cause damage to unit DO NOT operate unit in the test outputs mode any longer than is necessary for troubleshooting NOTE Fan turned on with all loads The outputs are Main Fan Compr1 3 ton Comprl1 HGBP1 Compr2 Compr2 HGBP2 Comprl1 Compr2 Chill Water Gly if present Reheat 1 Reheat 2 SCR Reheats if present Humidifier Common Alarm Test Inputs With the unit on and the fan running the input states may be displayed for the following devices Input Power High Water in Pan High Head Compl High Head Comp2 Air Sail Switch requires additional factory installed components Filter Clog Humidifier Prob Custom Alarm 1 Custom Alarm 2 Custom Alarm 3 42 Microprocessor Control Test Micro By selecting this function the microc
46. ed a RO URS Dees Sl Boa as eda Sead es 3 2 0 SITE PREPARATION AND INSTALLATION 00 00 0c eee e eee ee eee eee e ee eee eee eee 4 2 1 Installation Considerations dirt A A als od and Vea ehh keine 4 20 Room Preparation nito ie 8 sed A dd ite daba 4 2 1 2 Location Consliderati0Os eee eee eee e eens 5 2 2 System Weights ancla y E aw Lore BS Ad BOS Be Sos ea es 7 2 3 Equipment Inspection upon receipt ee eee e eens 7 2 4 Installing the Evaporator or Chilled Water Units 1 0 0 0 0 c cece eens 8 2 4 1 Close Coupled Installations cece cent e teen nnn 9 2 4 2 Evaporator Air Distribution s si ee a aa eee eee eens 10 2 4 3 Piping Connections and Coolant Requirements 0 000 cece eee nas 11 2 44 Electrical Connections Evaporator or Chilled Water Unit oooo ooooooooo 17 2 5 Indoor Air Cooled Centrifugal Fan Condensing Unit Installation 19 254 Location Considerations yes ai vale aaa Sos E a BE eG TAS 19 Dees A A A A dade Sass Oe dee r Gua vain do AE Straus 19 225 3 Pipine Connections yeze aa wie AA A Ble E E Sed Ne ELOY Spells we 20 2 5 4 Electrical Connections Condensing Unit 20 2 6 Outdoor Air Cooled Condensing Unit Installation 00 00 ee ees 23 2 61 Location Considerations 3 0 22 6 a a Maka Gate aed YA ees 23 2 62 Pipino Connections ss bse Gens tees Ah bers erent ae Se a Grane a oa le ee es ado 23 2 6 3 Electrical Connections iia a ea comcle w
47. en removed from in and around all equipment installed shipping materials construction materials tools etc Fans and blowers rotate freely without unusual noise Inspect all piping connections for leaks during initial operations Correct as needed 33 Microprocessor Control 3 0 MICROPROCESSOR CONTROL The Microprocessor Control for the Liebert Mini Mate2 unit features an easy to use menu driven LCD display The menus control features and circuit board details are described in this section Detailed information concerning controls 4 0 System Performance Microprocessor Controls and alarms 5 0 Alarms are provided 3 1 Feature Overview To turn the unit ON press the ON OFF I O key after power is applied To turn the unit OFF press the ON OFF I O key before power is disconnected The following control keys may be used to move through the menus as prompted on the LCD display ON OFF 1 0 turns unit on or off top far left Menu Enables user to access the program menu to change control parameters alarms setback schedule etc top near left Increase UP Raises the value of displayed parameter while in a set mode setpoints time etc Arrow top near right and navigates the program menu Escape ESC Allows user to move back to a previous menu top far right Alarm Silence Help If an alarm is present pressing this keypad will silence he alarm If this key is pressed when no alarms a
48. ensing Bulb External Equalizer Valve Lee Temp Service Access Receiver Ports Receiver Heater 4 2 Liquid Line Male Quick Pressure Limiting Peu Balancing Connect Coupling Switch Liquid Line Female Quick Connect Coupling Filter Drier ee Two circuits required single circuit shown for clarity Evaporator Coil DPN000236_Rev0 2 5 4 Electrical Connections Condensing Unit Refer to 2 4 4 Electrical Connections Evaporator or Chilled Water Unit and Figure 14 for general wiring requirements and cautions Refer to electrical schematic when making connections Refer to unit serial tag for full load amp and wire size amp ratings Power Connections The condensing unit requires its own power source and earth ground with a disconnect switch to iso late the unit for maintenance NOTE Refer to serial tag for full load amp and wire size amp ratings Control Connections Field supplied control wires must be connected between the evaporator and the condensing unit See Figure 14 and the electrical schematic on the units for more details Seven 7 wires are required between the evaporator and condensing unit Eighth and ninth wires are required on systems with hot gas bypass 20 Site Preparation and Installation Figure 13 Indoor air cooled centrifugal condensing unit dimensions and pipe connections 40 5 32 E ta i CABINET ENCON DIMENSION Customer supplied PS f threaded r
49. ent unit Considerations for Specific Applications In applications where the ceiling plenum is used as the heat rejection domain the discharge air must be directed away from the condensing unit air inlet and a screen must be added to the end of the discharge duct to protect service personnel Locate the air discharge a minimum of 4 feet from an adjacent wall Failure to do so may result in reduced air flow and poor system performance If the condensing unit draws air from the outside of the building rain hoods must be installed Hood intake dimensions should be the same as the condensing unit duct dimensions In addition install a triple layer bird screen over rain hood openings to eliminate the possibility of insects birds water or debris entering the unit Avoid directing the hot exhaust air toward adjacent doors or windows 19 Site Preparation and Installation 2 5 3 Piping Connections Details for refrigerant R 22 loop piping are in 2 4 3 Piping Connections and Coolant Require ments Figure 12 Piping connections indoor air cooled centrifugal fan condensing unit Condenser Coil Scroll Compressor Liquid Injection y Valve Bulb ave Bu b Hot Gas Bypass Solenoid Valve 3 8 9 5mm FLR Suction Line Male Quick uction o Pressure Relief Valve Connect Coupling Suction Line Female Quick Connect Coupling 7 Pressure NS Control Valve Hot Gas Bypass Control Valve S
50. equired settings described below Table 17 Humidifier control board DIP switch settings Voltage sw1 sw2 Sw3 Sw4 Amps 208 On On On Of 89 240 of On On of 85 380 415 of of of of 52 460 On On On of 45 575 On On of of 34 56 Maintenance Inspection Checklist 7 0 MAINTENANCE INSPECTION CHECKLIST JOB NAME ROOM TEMP HUM SERIAL DATE UNIT MODEL COND MODEL FILTERS COMPRESSOR __ 1 Check Replace Filters __ 1 Amp Draw 1 __ 2 Check Filter Switch __ 2 Amp Draw 2 3 Wipe Section Clean ___ 3 Check For Leaks Oil Level BLOWER SECTION 4 Vibration ___1 Impellers Free of Debris amp Spins Freely 5 Noise __ 2 Check Belt Tension and Condition Cap Tubes Not Rubbing ___ 3 Check Lube Bearings CONTROLS 4 Check Pulleys and Motor Mounts 5 Amp Draw REHEAT 1 Amp Draw __ 2 Inspect elements for cleanliness HUMIDIFIER 1 Check for Clogs 2 Check Humidifier Lamps tank 3 Check for Mineral Deposits 4 5 Check Water Make Up Valve for Leaks Check Drain amp Trap for Debris 6 Check Amp Draw REFRIGERATION CYCLE SECTION 1 Check Refrigerant Lines rubbing Suction Pressure 1 2 Discharge Pressure 1 2 2 3 4 Check Thermostatic Expansion Valve 5 Check Superheat1 ____ 2 6 Check Refrigerant Level Site Glass ELECTRICAL
51. ert remote monitoring unit optional will immediately indicate loss of power Short Cycle A Short Cycle Alarm will occur if a compressor system has exceeded 10 cooling start attempts in a one hour period This can be caused by room cooling load is small compared to capacity of the unit If room load is low increase temperature sensitivity to reduce cycle 48 Alarms 5 2 5 2 1 5 2 2 5 2 3 Optional Custom Alarms Change Filter Periodically the return air filters in the evaporator must be changed The Change Filter alarm noti fies the user that filter replacement is necessary A differential air pressure switch closes when the pressure drop across the filters becomes excessive The switch is adjustable using the procedure on the switch label Firestat The optional firestat feature is a bi metal operated sensing device with a closed switch under normal conditions Connected between pins 1 8 and 1 9 this device will shut down the entire unit Smoke Detector The smoke detector is located in the unit the optional smoke detector power supply is located in the electric panel It constantly samples return air through a tube No adjustments are required 49 System Operation Testing and Maintenance 6 0 SYSTEM OPERATION TESTING AND MAINTENANCE This section describes system testing maintenance and replacement procedures Use copies of the Maintenance Inspection Checklist to record preventive maintenance in
52. f operation Show DIP Switch This function shows the position of the DIP switches which are located on the control board in the unit 1 Switch is ON and 0 Switch is OFF For more information on the DIP switches and their functions see Table 17 Equipment Switch Settings Valve Time For Systems With a Modulating Chilled Water Valve This function shows the full valve travel time of the modulating valve on a chilled water system This is the time it takes for the valve to travel from full closed to full open It is programmable from 50 to 250 seconds factory default time is 165 seconds and should not be changed unless actual valve travel time is not correct The full valve travel time is used by the control to determine the appropriate valve position For example if the valve travel time is 165 seconds and 50 cooling is being called for the valve will open for 83 seconds to achieve 50 open 38 Microprocessor Control 3 10 7 CW Flush For Systems With a Modulating Chilled Water Valve 3 11 3 12 3 13 This function shows the interval time at which the system will perform a modulating chilled water valve system flush cycle The factory default is 24 hours and is programmable from 0 hours which signifies to never flush to 99 hours which signifies to flush after every 99 hours of valve non use If the valve is called on by the control to open within the programmed interval time the timer will be reset to
53. g and walls can be a polyethylene film Paint on concrete walls and floors should be vapor resis tant NOTE The single most important requirement for maintaining environmental control in the conditioned room is the vapor barrier Outside or fresh air should be kept to a minimum when tight temperature and humidity control is required Outside air adds to the cooling heating dehumidifying and humidifying loads of the site Doors should be properly sealed to minimize leaks and should not contain ventilation grilles Site Preparation and Installation 2 1 2 Location Considerations CAUTION Units contain water Water leaks can cause damage to sensitive equipment below DO NOT MOUNT UNITS OVER SENSITIVE EQUIPMENT A field supplied pan with drain must be installed beneath cooling units and water glycol cooled condensing unit NOTE Do not mount units in areas where normal unit operating sound may disturb the working environment Locate the evaporator unit over an unobstructed floor space if possible This will allow easy access for routine maintenance or service Do not attach additional devices to the exterior of the cabinet as they could interfere with maintenance or service Site Preparation and Installation Figure 1 System configurations air cooled systems E a gt Prop Fan Condensing Unit Centrifugal Fan Condensing Unit Figure 2 System Configurations water glycol systems lt A Cooling
54. h is located in the humidifier assembly This switch should be in the RUN position when the humidifier is in normal operation and in the DRAIN position during ser vice The electronic control board for the humidifier is also located in the humidifier assembly When the unit is energized power is available to humidifier Operation involves the following steps 1 During start up when the humidity control calls for humidification the fill valve will open allowing water to enter the canister When the water level reaches the electrodes current flows and the water will begin to warm The canister fills until the amperage reaches the setpoint and the fill valve closes As the water warms its conductivity increases and the current flow in turn rises If the amperage reaches 115 of the normal operating amperage the drain valve opens and flushes some of the water out of the canister This reduces electrode contact with the water and lowers the current flow to the amperage setpoint Boiling soon commences and the canister operates normally 2 Ifthe conductivity of the water is low the canister fills and the water level reaches the canister full electrode before the amperage setpoint is reached The humidifier stops filling to prevent overflow Boiling should commence in time As water is boiled off the mineral concentration in the canister increases and current flow also increases The canister eventually reaches full output and goes to normal operati
55. he National Electrical Code NEC and local codes Refer to Unit serial tag data for electrical requirements CAUTION Use copper wiring only Make sure that all connections are tight Voltage supplied must agree with the voltage specified on the unit serial tag A field supplied dis connect switch may be required Consult local code Route the electrical service conduit through the hole provided in the cabinet and terminate it at the electric box Make connections at the factory terminal block or disconnect switch L1 L2 L3 Connect earth ground to lug provided See transformer label for primary tap connections Installer will need to change transformer primary taps if applied unit voltage is other than pre wired tap voltage An optional single point power kit is available for units that are close coupled refer to Figure 11 and 2 4 3 Piping Connections and Coolant Requirements This kit should be mounted inside the evaporator unit before installing the unit in the ceiling Specific installation instruc tions are included with the single point power kit Control Connections 10 wire on air cooled 8 wire on water glycol cooled A field supplied control connection 24 VAC is required between the evaporator and the condens ing unit Control wiring must be installed in accordance with the National Electrical Code NEC Class 2 circuit Glycol cooled units also require a two wire control connection to the drycooler and pump Control w
56. he following list provides a definition and troubleshooting suggestions for each type of alarm Refer to 8 0 Troubleshooting for additional details If you need further assistance contact your Liebert supplier THE CUSTOMER MUST SPECIFY ALARM S AT THE TIME OF ORDER OTHER DEVICES AND WIRING MAY BE REQUIRED AT THE FACTORY FOR SOME OF THE ALARMS Custom Alarms Custom alarm s messages are programmed at the LCD display The message displayed may be included in a list of provided alarms or it may be customized text for up to three alarms IF CUS TOMIZED TEXT IS USED MAINTENANCE PERSONNEL SHOULD BE INFORMED OF THE ALARM FUNCTION AND THE REQUIRED ACTION High Head Pressure Compressor head pressure is monitored with a pressure switch One SPDT pressure switch is used If head pressure exceeds 360 psig the switch turns off the compressor contactor and sends an input signal to the control The condition is acknowledged by pressing the alarm silence button on the wall box which will clear if the head pressure is alleviated If the head pressure alarm has activated three times the alarm will lock until the unit is serviced After the head pressure problem is fixed reset the control by disconnecting power to the evaporator unit Air Cooled Systems Check for power shut off to the condenser condenser fans not working defective head pressure con trol valves dirty condenser coils or crimped lines Water Glycol Systems Check water regulat
57. hes 1 through 7 These are located on the control board near TB3 These switches are factory set and should not require any user changes The setting and function of the switches can be individually read on the LCD display NOTE In order to update the DIP switch settings power must be cycled off then on from the unit disconnect switch Table 14 Equipment switch settings unit control board Switch OFF Position ON Position 1 Step Cool Ramp Cool 2 Step Heat Ramp Heat 3 Not Used Not Used 4 No GLYCOOL GLYCOOL 5 Disable 1 stage CW Enable 1 stage CW 6 Not used Not used 7 1 stage 2 stage dehumidification dehumidification 8 Disable SCR Reheat Enable SCR Reheat Table 15 Switch settings wallbox board Switch OFF Position ON Position 1 Beeper Disable Beeper Enable 2 Not Used Not Used 3 Not Used Not Used 4 Enable Reheat Disable Reheat 5 Enable Hum Disable Hum 6 Enable Dehum Disable Dehum 7 Disable Setback Enable Setback 8 Enable Password Disable Password 41 Microprocessor Control 3 18 Run Diagnostics By selecting Run Diagnostics maintenance personnel can check system inputs outputs and conduct a test of the microcontroller circuit board from the wall box control A review of the system inputs and the microcontroller test can be done without interrupting normal operation Test Outputs When this feature is selected the controller is eff
58. i y Removable Access Panel System 2 5Ton Liquid Line Connection 7 8 22mm dia electrical entrance dd 10 Male for low voltage connection 718 22mm dia knockout electrical entrance for alternate control panel low voltage routing SL 11089 PG 6 28 Site Preparation and Installation Figure 19 Indoor water glycol condensing unit electrical field connections AN Electric Service not Optional Factory Installed Field Supplied Unit Disconnect by Liebert Disconnect Switch Switch when Factory Unit gt Disconnect Switch is not f 8 supplied ae Removable Access Panel Line Voltage Electric Power Supply Conduit Field Supplied 24V NEC Class 2 Wiring between Glycol Condensing Unit and Drycooler Connection Terminal for Field Supplied Earth Grounding Wire Field supplied 24V NEC Class 2 wiring Glycol cooled units only Heat Rejection Connection Field supplied 24V NEC Low Voltage Electric Power Class 2 wiring Connect to Supply Conduit Entrance factory supplied pigtails NOTE Refer to specification sheet for full load amp and wire size amp ratings SL 11089 PG 7 29 Site Preparation and Installation Figure 20 System piping with indoor water glycol cooled condensing unit Two circuits provided Single circuit shown Scroll Tube in Tube Condenser HotGas Bypass Solenoid Valve Z Hot Gas Bypass Control Valve Fluid Return Liquid Injection From U
59. ie alone kaw dak onan na 23 2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 3 12 3 13 3 14 3 15 3 16 3 17 3 18 4 0 4 1 4 2 Indoor Water and Glycol Cooled Condensing Unit InstallatioN 27 2 7 1 Location Considerations i oui esan vaa ia eee eee ene eens 27 2 7 2 Piping Connections s iste bias ound sce aaa es Re OBS Re ihe ao bate ce es st 27 21097 Electrical Connecti Ons A Riley su sells nae ra baleen blot ety Bede nln td is 27 Optional Equipment Piping 0 0 eee eee eens 31 2 8 1 Free Cooling Coil GLYCOOL 0 0 eee e eens 31 Checklist for Completed Installation 00 ccc cece ee ee eens 33 MICROPROCESSOR CONTROL 00 0c eee eee e eee eee eee eee eee eee ees 34 Feature Overview so cosh ARA ERS SER CSR AS OEE AA EEA 34 Main Menu sMenu ic a aetna eee ae LG glade id p ete as 35 DELI sis ss ohn crt Beet ot Sard Se ees PR ant eee a 36 Status nde ed den Oe e La T eo o fl a e a Nd e e AS A O eo 36 Act ALAS ti A A A A A cito 36 Alarm History reenen as rur a r IS A AA A Ara T EAA 36 MAING oer octets E E AE NN 37 Date stat a wha IRA sea aaa dit bd bed oan 37 Setback cita e A A bed ich Po AT Ace e 37 SETUP pera oi E AAA Aa Sea ad heb eee See E 37 3 10 1 Restart lime Deli a Wis A A ES A is 37 81 0 2 CHE DESEES A AR A AA A A SI A IA id 38 3 10 3 Humidity Control Methodi oa ae t Reena 38 3 10 47 Fead Compressor 300 A NL a Se
60. ing Unit 9 D Filter Clog amp Smoke Detector H H Hot Gas Bypass E Filter Clog amp Firestat 096A 096A 8 ton Air Cooled 60 Hz F Smoke Detector amp Firestat 095A 8 ton Air Cooled 50 Hz G Filter Clog Smoke Detector amp Firestat Standard Coil C Coated Coil A 460V 3ph 60 Hz A B 575V 3ph 60 Hz Y 208 230V 3ph 60 Hz M 380 415V 3ph 50 Hz L L 95 F Ambient Lee temp 0 0 Revision Level Table iii Heat rejection matchup 60 Hz Condensing Unit Nominal Cooling Indoor Air Cooled Outdoor Air Cooled Indoor Capacity Unit Centrifugal Fan Propeller Fan Water Glycol 8 Tons MMD96E MCD96A PFCO96A MCD98W 8 Tons MMD8TC Chilled Water Unit Table iv Heat rejection matchup 50 Hz Condensing Unit Nominal Cooling Indoor Air Cooled Outdoor Air Cooled Indoor Remote Capacity Unit Centrifugal Fan Propeller Fan Water Glycol Cooled 8T MMD95E MCD95A PFCO95A MCD97W ons MMD8TC Chilled Water Unit Product Features 1 0 PRODUCT FEATURES 1 1 Standard Product Features The Mini Mate2 is a temperature humidity control system designed to be installed above a ceiling grid system The unit is available as a split system evaporator to be matched with an Indoor Centrif ugal Fan Condensing Unit Outdoor Prop Fan Condensing Unit or Indoor Water Glycol Condensing Unit A self contained Chilled Water Fan Coil is also available Controls The Mini Mate2 system includes a wall mounted display panel w
61. ing rails to the sled 7 Slide the blower rail assembly forward and rotate approximately 45 degrees and remove from unit 8 Replace failed parts 51 System Operation Testing and Maintenance 6 2 4 6 2 5 Electric Reheat Reheat element sheets and fins are manufactured with stainless steel Regular inspections are neces sary to assure proper cleanliness of the reheating element Should inspection reveal corrosion parti cles on the reheating element or adjoining surfaces including ducts and plenums appropriate cleaning should be performed Periodic replacement of the reheating element may be necessary to meet specific application requirements Refrigeration System Each month the components of the refrigeration system should be inspected for proper function and signs of wear Since in most cases evidence of malfunction is present prior to component failure peri odic inspections 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 Inspect the capil lary and equalizer lines from the expansion valve Suction Pressure Suction pressure will vary with load conditions Suction pressure normally ranges from 58 psi to 75 psi 405 kPa to 517 kPa When the 3 ton circuit is operating alone the upper range of suction p
62. ing rises from 0 to 100 If the call for cooling continues to increase the control will energize the compressors as needed to match the average cooling requirement As long as GLYCOOL is available the control will leave the valve 100 open If GLYCOOL cooling is not avail able the temperature control will operate the compressors in the same manner as the Multi Step without GLYCOOL Reheat Electric Reheat Staged For 2 stage electric reheat they are activated when the temperature control calculates a requirement of 50 and 100 They are deactivated when the requirement decreases to 75 reheat 2 and 25 reheat 1 SCR Electric Reheat The SCR Silicon Controlled Rectifier controller shall proportionally control the stainless steel reheats to maintain the selected room temperature The rapid cycling made possible by the SCR con troller provides precise temperature control and the more constant element temperature extends heater life During operation of the SCR control the compressor s operate s continuously The heat ers are modulated to provide temperature control If overcooling occurs the compressor s will be locked off when the temperature drops to the low temperature alarm SCR reheats are 15 kW 45 System Performance Microprocessor Controls 4 4 4 4 1 4 4 2 4 4 3 4 5 4 6 Dehumidification Humidification Percent Required The humidity control for the MM2 is based on a calculated percent requireme
63. ing valves Verify water glycol flow 1 e pumps operating and service valves open Is water tower or drycooler operating Is the coolant temperature entering the condenser at or below design conditions Is AUX relay terminals 70 amp 71 operating during cooling to turn on the drycooler 47 Alarms 5 1 3 5 1 4 Humidity The humidity alarm may be activated under the following conditions High The room return air humidity exceeds the pre set high humidity alarm setpoint Is the unit set up for dehumidification Check DIP switch Low The room return air humidity decreases to the low humidity alarm setpoint Is the unit setup for humidification Check DIP switch High and Low Humidity simultaneously The simultaneous display of two alarms results in loss of the humidity input signal DASHES WILL BE DISPLAYED IN THE HUMIDITY READ ING DISPLAY Under these conditions the control system deactivates both humidification and dehumidification Check for a disconnected cable or failed sensor NOTE 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 Temperature The temperature level alarm may be activated under the following conditions High The room return air temperature increases to the high temperature alarm setpoint Check for proper setpoint value Is the room load more than the unit can handle i e capacity too small Make s
64. iring between the evaporator and the condensing unit must not allow a voltage drop in the line of more than 1 volt 16 gauge minimum for 75 feet Do not connect additional electri cal devices to the control circuit The internal control transformer is only sized for factory supplied components Additional control wiring will be required if your system includes other optional monitoring and control devices Four 4 wire thermostat type must be connected between the evaporator control board and the wall box See Figure 25 and Figure 26 and see Figure 11 for electrical connections 17 Site Preparation and Installation Figure 11 Evaporator unit electrical connections Customer Remote Alarm Connection TB50 51 56 24 Field supplied 24V Class 2 wiring Earth Ground Connection Connection terminal for field supplied earth grounding wire Common Alarm Connection Use field supplied 24V Optional factory installed Class 2 wire TB75 76 disconnect switch High Volt Power Connections Electric service connection terminals Drycooler Circulating Pump Control Circuit TB70 71 Optional WIGlycool Econ O Cycle models Use field supplied 24V class 2 wire Optional Condensate Pump Auxiliary Float Switch Shut a Down Connection 7 TB60 61 Y Board FRONT OF UNIT Remote Control Panel Connection to TB3 1 2 3 4 connected with field supplied Thermostat wire 22ga shielded jacketed
65. ith a liquid crystal display LCD screen and a 7 membrane keypad The control is menu driven for ease of use Figure 24 Section 3 depicts the complete menu tree for the control All control setpoints and alarm setpoints are program mable Evaporator System Components DX Evaporator Section The evaporator section includes the evaporator coil thermostatic expansion valves filter dryers and blower The evaporator coil is constructed of copper tubes and aluminum fins and is designed for the high sensible heat ratio required for electronic equipment Room air circulation is accomplished by a double inlet belt driven centrifugal blower that has been dynamically balanced The blower has self aligning bearings Both the blower and motor have permanently lubricated ball bearings Chilled Water Model The Chilled Water model is self contained and is designed for use with an existing chilled water loop It contains a chilled water coil and a proportional modulating valve to control the flow of chilled water Condensing Unit Components The condensing unit is connected to the evaporator unit by four refrigerant lines and low voltage con trol wires The condensing unit requires a power source and a power disconnect switch A single point power kit is available for close coupled attached units Air Cooled Condensing Unit Indoor Centrifugal The Air Cooled Condensing units MC models include 3 ton and 5 ton scroll compressors with motor be
66. itivity 2 0 F 1 9 9 F 0 6 5 6 C Humidity Setpoint 50 20 80 RH Humidity Sensitivity 5 1 30 RH 5 35 95 F High Temperature Alarm 80 F 2 35 C o 35 95 F Low Temperature Alarm 65 F 2 35 C High Humidity Alarm 60 15 85 RH Low Humidity Alarm 40 15 85 RH Status The operator can monitor the percentage heating cooling dehumidifying and humidifying status of the unit by selecting STATUS from the main menu Active Alarms The operator can monitor the alarms status by selecting ACTIVE ALARMS which will display a Alarm XX of YY alert and description If more than one alarm is activated use the Up Down arrow to scroll through the alarms list XX reference is the number of the alarm shown and the YY ref erence is the total number of alarms activated Alarm History A history of the 10 most recent alarms is kept in non volatile memory complete with the date and time of their occurrence The first alarm in the history is the most recent and the 10th is the oldest If the ALARM HISTORY is full 10 alarms and a new alarm occurs the oldest is lost and the newest is saved in ALARM HISTORY location 1 The rest are moved down the list by 1 ALARM HISTORY on new units may show the results of factory testing 36 Microprocessor Control 3 7 3 8 3 9 3 10 3 10 1 Time The controller time clock must be set to allow for the setback control The clock uses the 24 hour sys tem i e
67. lt driven centrifugal blower crankcase heaters high pressure switches condenser coils and Lee Temp head pressure control with receivers Air Cooled Condensing Unit Outdoor Prop Fan Outdoor Air Cooled Condensing Units PFC models include 3 ton and 5 ton scroll compressors with crankcase heaters high pressure switch condenser coils direct driven propeller fan and Lee Temp head pressure control with receivers Water Glycol Condensing Unit Indoor The Water Glycol Cooled Condensing units include 3 ton and 5 ton scroll compressors with crank case heaters high pressure switches coaxial condensers and regulating valves Drycooler and pumps are selected separately for glycol systems Product Features 1 2 1 2 1 1 2 2 1 2 3 1 2 4 1 2 5 1 2 6 1 2 7 1 2 8 Optional Equipment Canister Humidifier The optional factory installed steam generating humidifier adds pure water vapor to the room air to control humidity Room humidity setpoints are established by the user The humidifier components include a steam canister replaceable control board inlet strainer fill and drain valves Electric Reheat The 304 304 stainless steel electric reheat is energized when required to heat room air or to control room temperature during dehumidification A safety switch prevents the reheat from exceeding tem perature limits SCR Electric Reheat The 304 304 stainless steel reheat is pulsed rapidly to provide pr
68. midification Compressorized Direct Expansion DX Systems 46 4 4 2 Humidification Operation anassa naana eerren eee 46 4 4 3 Dehumidification Lockout ei ee e a ce eee eee ARE ens 46 Load Control Features ou cs dace ob REV E BE RA Gee Perk Si A A E eS 46 COMMUNDICAION 8 25 da Seed Seed aed A ad oh OEE AA ad ale 46 ALARMS lt a ia aa 47 Alarms Definitions and Troubleshooting 0 0 00 e eens 47 DhE a ustom Alarms ccte asa shee A aii oxy 47 B12 High ead Pressure secs A a dd AE Dei 47 Skan y AA NN 48 DLA Temperature eee aaa A e Adi a A tado A Sade Sune bin Saved idea 48 5 1 5 Humidifier Problem Alarm 48 51 6 High Water Alarm esaii haa as td a Ble ba tite a Gib ad ayes cta oS Alla tab 48 Dal TuOSsOF POWELL ot ia a ly a doe Pea A td ie da 48 DA 8 Short Cycle e a A OA td yeahh aoe 48 Optional CustomAlarMs a A he eas A a AAA ne 49 02 Lo Changer Filters tad ts o a da lero ES ia 49 O A E E E ERSE Ga EAE 49 Jaa 1 OMOKe Detecta A a a ai 49 SYSTEM OPERATION TESTING AND MAINTENANCE 0o 0ocococoror n nnna 50 System Testi dentada be eo aes 50 6 1 1 Environmental Control Functions 50 0 A E RON ON ON NA NS 50 611637 Heat tr di a A A dt Ad Da 50 GLA HumiditicatiO dais AR AA a IT BAA YR Ae a 50 6 1 5 DehumiditicatiO bi da 0 dido cdg hon hic Sure Daa a dt dp apna Pavey id 50 ELG Remote Shutdown scale tj A AE ES RT st E ds s 50 Maintenance and Component Operation 0 0 eee eens 51 6 2
69. ndensing Unit Evaporator Suction Line Piping Condensing Unit Above Evaporator Traps recommended every 25 feet 7 6 m of vertical rise 14 Site Preparation and Installation Refrigerant Charge Requirements Total refrigerant charge R 22 will be required only if units are evacuated during installation or maintenance For safe and effective operation refer to 2 4 3 Piping Connections and Coolant Requirements Total refrigerant Units and Lines Table 7 8 ton unit refrigerant charge Evaporator Charge ounces Model No 3 ton circuit 5 ton circuit MMD96E 7 7 MMD95E 7 7 Condensing Units Model No Charge ounces MCD96A 361 581 MCD95A 361 581 MCD98W 54 94 MCD97W 54 94 Table 8 Line charges field piping O D Liquid Line Suction Line 1 2 7 3 1 1 0 2 0 1 5 8 11 7 1 7 0 3 0 1 7 8 24 4 3 6 0 7 0 1 1 1 8 41 6 6 2 1 2 0 2 weight of R 22 in type L copper tube Ib per 100 ft kg per 10 m Quick Connect Fittings NOTE When hard piping is used complete all piping and evacuate lines before connecting quick connects Be especially careful when connecting the quick connect fittings Read through the following steps before making the connections 1 Remove protector caps and plugs Carefully wipe coupling seats and threaded surfaces with a clean cloth Lubricate the male diaphragm and synthetic rubber seal with refrigerant oil Thread the
70. ng coil the coil is flushed periodically NOTE If the free cooling coil is piped to an open water tower a CU NI cupro nickel type coil must be ordered to prevent corrosion of the copper tubes or a heat exchanger must separate the tower water from the free cooling loop On water cooled systems the free cooling coil outlet can be field piped to the condensing unit inlet provided a 3 way regulating valve has been installed within the water glycol condensing unit see Figure 21 Figure 21 Optional free cooling coil 3 way valve on water glycol units Tube in Tube Condenser Bleed Valve Fluid Free Cooling Return Control From Unit Valve II Fluid Free Cooling Supply Fluid To Unit Return Shut A Il Off e A a a A Valves DA 5 se Zl Adapters Za Shut off eZ 3 Way Water Hose a a Valves Hose Y Fluid Regulating Valve Bibs a L 2 Bibs Supply Optional ee ee SS _m5S To ee i Unit SU ts FIELD PIPING FACTORY PIPING Field piping refers to the use of hard piping using sweat adapter kit or precharged line set SL 11088Pg12 31 Site Preparation and Installation Figure 22 Optional free cooling coil 3 way valve on air cooled units Bleed Valve Free Cooling Fluid Control Return Valve K7 Fluid From Unit A Free Cooling Supply j N Coil To Unit Sensor Shut A Z Off a Z VA Female ee Z Adapters Bibs Li FIELD PIPING OPTIONAL PIPING FACTORY PIPING
71. nit A gr To Unit W Liquid Line Shut off A y Male Quick Valves amp 1 AY 2 Way Water y Connect A K a Regulating Val Liquid Line Coupling Hose Bulbs gy poua tan Female Quick J Connect Expansion Coupling Tube in Tube Condenser Water Glycol Return Line Water Glycol Supply Line Valve Fluid Return g From Unit Fd Supply AA Evaporator Coil To Unit 3 Way Water Regulating Valve Optional gt L FIELD PIPING oo OPTIONAL PIPING FACTORY PIPING Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance Note Condenser water circuits are headered together to form one 1 supply connection and one 1 return connection SL 11088Pg7 30 Site Preparation and Installation 2 8 Optional Equipment Piping 2 8 1 Free Cooling Coil GLYCOOL The free cooling coil is a secondary coil located upstream of the DX coil To take maximum advantage of available free cooling the secondary coil may operate at the same time as the DX coil A tempera ture sensor is factory mounted to the free cooling piping When fluid temperature is sufficiently below the room temperature cooling is provided by circulating the fluid through the secondary cooling coil flow is controlled by a motorized valve Compressors are staged on if needed to supplement the free cooling To keep deposits from building up in the free cooli
72. nnection is provided in the evaporator module Connect wire 8 and wire 6 to the NOTE Refer to specification sheet 24V supply boa di 9 24V GND Condenser Fan fortul pesas 10 24V SUPPLY Condenser Fan amp ratings DPN000135_Rev0 Earth ground connection terminal for field wiring 24 Site Preparation and Installation Figure 16 Footprint dimensions outdoor condensing unit GUARD HEIGHT TOP AIR DISCHARGE RIGHT AIR INTAKE LEFT AIR INTAKE SHADED AREA INDICATES A RECOMMENDED CLEARANCE OF 18 457mm FOR PROPER AIR FLOW SHADED AREA SHADED AREA INDICATES A RECOMMENDED CLEARANCE OF 18 457mm REMOVABLE FRONT PANEL FOR pe oe a FOR PROPER AIR FLOW ACCESS TO HIGH VOLTAGE amp FOR COMPONENT LOW VOLTAGE CONNECTIONS ACCESS AND REMOVAL AND REFRIGERATION COMPONENTS 36 1 8 918mm 533 16 1351mm 1 2 Bolt Down Holes 6 places 4 23 32 ee O jr 120mm l 5 mm 32 1 8 253 32 637mm SS inn 51mm 46 7 32 1174mm FOOTPRINT DIMENSIONS DPN000131_Rev0 Model Dimensional Data in mm Net Weight 60 Hz 50 Hz Width A Height B Depth C Ibs kg PFCO96A _L PFCO95A _L 53 1343 36 1 4 918 38 1 2 978 488 222 PFHO96A _H PFHO95A _L 53 1343 36 1 4 918 38 1 2 978 488 222 Site Preparation and Installation Figure 17 Piping and electrical connections outdoor condensing unit System 2 5 Ton
73. nsers Condensing Unit Fluid Requirements The maximum fluid pressure is 150 psi standard pressure or 350 psi for high pressure units Refer to unit serial tag and model number description page at beginning of this manual NOTE HVAC grade ethylene or propylene glycol should be used on glycol systems Automotive antifreeze must not be used Regulating Valve Water Glycol cooled units include a coolant flow regulating valve which is factory adjusted and should not need field adjustment Standard water pressure and high water pressure valves are adjusted differently Contact Liebert Service before making any adjustments Electrical Connections Refer to 2 4 4 Electrical Connections Evaporator or Chilled Water Unit for general wiring requirements and cautions Refer to electrical schematic when making connections Refer to serial tag for full load amp and wire size amp ratings Control Connections A six wire control connection is required from the evaporator unit to the water glycol condensing unit Two 2 additional wires are required when hot gas bypass is ordered Glycol cooled units also require a two wire control connection to the drycooler and pump package 27 Site Preparation and Installation Figure 18 Indoor water glycol condensing unit dimensional data e whe 00 IDO 24V GND System 2 Connection from Evaporator entrance for line voltage connection 24V Supply System 2 High Pressure Alarm 1 1 4 32mm
74. nt for dehumidification or humidification The percent requirement is calculated from the difference between the sensor read ing and the humidity setpoint divided by the sensitivity The control method is selectable between relative and absolute Relative humidity control is the default Staged Dehumidification Compressorized Direct Expansion DX Systems For the 8 ton unit operation 1 or 2 stage dehumidification is selected through DIP switch 7 For 2 stages the 5 ton compressor is the lead compressor when dehumidifying Dehumidification will be staged on at 50 and 100 call The electric reheats are turned on at 25 cooling reheat 1 and 25 heating reheat 2 for improved temperature control The reheats are deactivated at 0 and 50 cool ing requirement respectively If overcooling occurs the first stage of dehumidification is disabled at 125 call for heating If 1 stage or 2 stage is selected dehumidification is disabled at 200 call for heating Dehumidification is re enabled at 66 call for 2 stage and 33 call for 1 stage For optional hot water heating the valve is energized at its normal point 100 heating requirement Humidification Operation System Activation The humidifier is activated when the humidity control calculates a requirement for 100 humidifica tion and is deactivated when the requirement falls below 50 Dehumidification Lockout Dehumidification is locked out if overcooling occurs Dehumidification on th
75. ods for module 191 32 support from ceiling 1 2 minimum diameter Sto 483mm 8 13 16 recommended typ 4 224mm E 13 32 SJ 26 13 16 mm PEN 16 5 16 5 414mm 23 7 8 pat dan lt A Shaded area indicates a recommended clearance of 4217182 64 1 4 30 762mm for component 1080 3mm 1632mm Hanger access and removal THREADED ROD Bracket THREADED ROD CENTERS CENTERS NOTE Unit is spaced evenly in reference to threaded 9 16 14mm dia holes for rod centers threaded rods typ 2 each end 7 8 22mm amp 1 1 8 29mm Air Outlet dia knockouts electrical entrance Air Inlet for high voltage connection Single Point Power Kit connection from Evaporator System 1 3Ton Suction Line Connection Aeroquip 11 Male System 2 5Ton Suction Line Connection Aeroquip 12 Male System 1 3Ton Liquid Line Connection Aeroquip 6 Male System 2 5Ton Liquid Line Connection Aeroquip 10 Male 7 8 22 2mm dia knockout electrical entrance for alternate control panel low voltage routing DPN000248_Rev1 7 8 22 2mm dia electrical entrance for low voltage connection 21 Site Preparation and Installation Figure 14 Indoor air cooled centrifugal condenser electrical connections Field Supplied Unit Disconnect Switch when Factory Unit Disconnect Switch is not Supplied Electric Service not by Liebert Line VoltageElectric Power Supply Conduit _ Removable al Access P
76. on No drain is permitted until then 3 When full output is reached the circuit board starts a time cycle which is factory set at 60 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 setpoint The amperage variance will depend on the conductivity of the water 4 After a period of time 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 decreases When the current crosses the low threshold point factory set at 85 before the end of the time cycle the drain valve opens draining the mineral laden water out and replacing it with fresh water This lowers the mineral concentration and returns the canister to steady state operation and prolongs canister life The frequency of drains depends on water conductivity 5 Over a period of time the electrode surface will become coated with a layer of insulating material which causes a drop in current flow As this happens the water level in the canister will slowly rise exposing new electrode surface to the water to maintain normal output Eventually the steady state water level will reach the canister full electrode and indicate so by activating the canister full alarm At this point all of electrode surface has been used up and the canister shoul
77. on pressure required reinstall cap tightly making sure there are no leaks 6 Let the evaporator operate for approximately 10 to 15 minutes to make sure the suction pressure is within the range desired 7 There may be a fluctuation of approximately 3 to 6 psig 21 to 41 kPa on the evaporator due to the differential on the hot gas bypass 8 Return temperature setpoint to the desired setting 53 System Operation Testing and Maintenance Replacement Procedures Compressor Replacement Infrequently a fault in the motor insulation may result in a motor burn out if system is properly installed motor burnout rarely occurs Primarily this type of failure is due to mechanical or lubrication problems where the burnout is a secondary consequence Early detection can prevent a large percentage of the problems that can cause compressor failures Periodic maintenance inspections by alert service personnel i e identification of abnormal opera tion can be a major factor in reducing maintenance costs It is easier and more cost effective to imple ment the necessary preventative steps that ensure proper system operation rather than ignore a problem until it results in compressor failure and costly replacement When troubleshooting a com pressor problem check all electrical components for proper operation CAUTION Avoid touching or contacting the gas and oils with exposed skin Severe burns will result Use long rubber gloves in han
78. ontroller will perform a self test lasting approximately 10 sec onds When the test is complete the display will show the ROM checksum ROM part number and firmware revision number Figure 24 Control menu Setpoints Temp Setpt g Temp Sens Alarm Time Dela Hum Setpt Hum Prob Hum Sens a ji Hi Temp Alm OSSA LoT p Al Setup Operation Custom 1 OIP T Restart TD i Custom 2 Hi Hum Alm C F Degrees Custom 3 Lo Hum Alm P Humidity Control High Temp Status Lead Compr Low Temp Dx Cool 0 Dipswch 00000000 High Hum CW Valve 0 Pos 12345678 Low Hum Econo Cool 0 Valve Time Short Cyc1 Menu Humidify 0 Loss Pwr Setpoints Setpoint Password Status Active Alarms Enter New PSW Active Alarms No Alarms Setpt PSW 000 Com Alarm Enable or Hum Prob Alarm History j Time Alarm 01 of 01 Hi Head 1 Date High Head Setup Password Hi Head 2 Setback Enter New PSW Chng Filtr Setup Operation Time Setup PSW 000 Pi de Status Display Setpoint Pa 49 72 F 50 RH Password Date Calibrate sensor Custom 3 NO ALARMS Setup Password TD ean A Temp Cal Hi Water Calibrate Sensor Alarm Enable Setback Puna High Temp Wknd Time 1 Temp Delay Low Temp Alarm Time Delay Hum Delay High H Com Alarm On Off gnum Enable Wknd Temp 1 Low Hum Custom Alarms Wknd Tsens 1 Alarm Enable Short Cyc1 Custom Text Wknd Humd 1 Hum Prob Short Cyc2 Diagnosti
79. r main power is restored to the unit If several systems are oper ating the time delays should be set to different values to cause a sequential start Delay can be set from 0 1 minutes 6 seconds to 9 9 minutes Setting the value to zero 0 will prevent unit restart when power is restored In this case the unit must be restarted manually by pressing the ON OFF button on the keypad 37 Microprocessor Control 3 10 2 3 10 3 3 10 4 3 10 5 3 10 6 C F Degrees The control may be selected to show readings and setpoints in either degrees Fahrenheit F or in degrees Celsius C To change the value use ENTER to select this function then use the UP DOWN arrow to change the value Press ENTER to store the value Humidity Control Method The operator may select either relative direct or absolute predictive humidity control If relative is selected the RH control is taken directly from the RH sensor If absolute is selected the RH con trol is automatically adjusted whenever return air temperature deviates from the desired tempera ture setpoint i e predictive humidity control The LCD display will indicate percentage relative humidity for both methods of control If the absolute feature is selected the adjusted humidity read ing will also be shown When utilizing the predictive humidity control feature the humidity level is automatically adjusted 2 RH for each degree difference between the return
80. re present help text will appear bottom near left Decrease DOWN Arrow Lowers the value of displayed parameter while in a set mode bottom near right and navigates the program menu Enter After setting a control point press ENTER to store the information in the microprocessor bottom far right Also press ENTER to select a menu item Figure 23 Wall box Active alarms are displayed on the LCD screen and sound an audible beeper To silence an alarm press the Alarm Silence Help key as prompted on the display Setpoints DIP switch settings and other selections were made during factory testing of your unit and are based upon typical operating experience Other default selections were made according to options included with your unit MAKE ADJUSTMENTS TO THE FACTORY DEFAULT SELECTIONS ONLY IF THEY DO NOT MEET YOUR SPECIFICATIONS Allowable ranges are displayed by pressing the help key A password will be required if enabled to change setpoints time delays etc The display normally shown includes the present room temperature humidity active status func tions cooling heating dehumidifying humidifying and active alarms More detailed status and alarm information is available from the menu 34 Microprocessor Control 3 2 Main Menu lt Menu gt Press the MENU key to display the Main Menu The Menu selections in the following order include SETPOINTS STATUS ACTIVE ALARMS ALARM HISTORY T
81. res sure may approach 100 psig This is a function of the unit design and is acceptable for scroll compres sors Discharge Pressure The discharge pressure will vary greatly with load and ambient conditions Table 16 The high pres sure switch will shut the compressor down at its cut out setting Table 16 Typical discharge pressures System Design psig kPa Air Cooled 180 275 1242 1895 Water Cooled 65 F to 85 F water 200 225 1380 1550 18 to 29 4 C Glycol Cooled 210 275 1445 1895 Maximum 330 2275 High Pressure Cut Out 360 2480 Thermostatic Expansion Valve The thermostatic expansion valve keeps the evaporator supplied with enough refrigerant to satisfy load conditions Proper valve operation can be determined by measuring superheat level If too little refrigerant is being fed to the evaporator then the superheat will be high Conversely if too much refrigerant is being supplied then the superheat will be low The correct superheat setting is between 10 and 15 F 5 6 and 8 3 C Only the 5 ton valve is adjustable Air Cooled Condensing Units Restricted airflow through the condenser coil will reduce the operating efficiency of the unit Addi tionally it can result in high compressor head pressure and loss of cooling Using compressed air or commercial coil cleaner clean the condenser coil of all debris that will inhibit airflow In winter do not permit snow to accumulate around the
82. rom the optional alarm list and or can have their own fully custom text The custom alarm inputs are contact closures wired from terminal 24 through a normally open contact to either 50 alarm 1 51 alarm 2 or 56 alarm 3 The alarms can be enabled disabled refer to 3 0 Microprocessor Control and a time delay of 0 255 seconds can be set The alarms can also be programmed to either sound the alarm amp activate the common alarm relay OR to sound the alarm only When a new alarm occurs it is displayed on the screen and the audible alarm is activated If commu nicating with a Liebert Site Product the alarm is also transmitted The message PRESS ALARM SILENCE will prompt the operator to silence the alarm After the alarm is silenced the display will return to the Normal Status Display Alarms can be reviewed by selecting the ACTIVE ALARMS feature The alarms can also be silenced through communications with a Liebert Site Products Unit Many alarms will reset automatically when the alarm condition is no longer present and only after it has been acknowledged by being Silenced The exceptions are 1 Software alarms i e Loss of Power and Short Cycle alarms will reset automatically 30 seconds and 90 minutes respectively after being silenced or acknowledged and 2 Specific alarms monitoring overload or high pressure switches may require a manual reset depending upon the model Alarms Definitions and Troubleshooting T
83. s a sta lg id od aes 44 TABLES Heat rejection matchup 60 Hz v Heat rejection matchup 50 HZ o o oo oooo ooo v Application limits evaporator and chilled water units 0 00 000 eens 4 Application limits indoor and outdoor air cooled condensing units 0 00 c eee eens 4 Application limits indoor water glycol cooled condensing unitS 0 0 00 cece eee ee eee 4 Unit weights vrai a i am the Site eee eee eee es waves Demos ta oie woes 7 Evaporator external static pressure 60 at 3750 CFM 6371 CMH 00 0000 ee 10 Recommended refrigerant line sizes 1 eee e eee ene 14 8 ton unit refrigerant charge 0 0 ee E eens 15 Line charges field piping o 15 Refrigerant quick connect sizes and torque 6 6 cc eee ee ene nes 15 Default setpoints and allowable ranges 1 0 ce teen eens 36 Night and weekend setback plan 2 eee e ene nen eee nns 37 Setup functions default values and allowable ranges 0 0 0 cece cee eens 39 Alarm d fault time delays iii iia ware added RGR AEE Gaerne eh Gee PaO A Pali Behe SPs es 40 Equipment switch settings unit control board 1 0 0 0c cette eee 41 Switch settings wallbox board oooooooooorr ee eee eee nes 41 Typical discharge pressures 1 6 o 52 Humidifier control board DIP switch settings suunas saanunna nerne 56 Troubles hootin il e A eM att adhe Alden tenet ad 58 MODEL NUMBER NOMENCLATURE
84. spections A Unit contains hazardous electrical voltage Disconnect power supply before working within Line side of factory disconnect remains energized when disconnect is off 6 1 System Testing 6 1 1 Environmental Control Functions The performance of all control circuits can be tested by changing the setpoints which activates each of the main functions 6 1 2 Cooling To test the cooling function set the setpoint to a temperature of 10 F 5 C below room temperature A call for cooling should register and prompt the equipment to begin cooling cycle Disregard any temperature alarms Upon completion of testing return setpoint to the desired temperature 6 1 3 Heating Reheat may be tested by setting the setpoint 10 F 5 C above room temperature A call for heating should register and prompt the equipment to begin heating cycle Disregard any temperature alarms Upon completion of testing return setpoint to the desired temperature 6 1 4 Humidification To check humidification set the humidity setpoint at RH 10 above the room humidity reading After a short delay the canister will fill with water and steam will be produced Upon completion of testing return the humidity setpoint to the desired humidity 6 1 5 Dehumidification The dehumidification performance can be tested by setting the humidity setpoint at RH 10 below room relative humidity The compressor should turn on Upon completion of testing return humidity setpoint to the
85. sulated to prevent condensation The minimum recommended water temperature is 42 F Connection sizes are 1 1 4 FPT Figure 8 General arrangement diagram chilled water systems Bleed Valve Chilled Water Chilled Supply Water Return att Tall Chilled Water Coil Chilled Water Control Valve Jl dd Shutoff Valves Ey co Hose Bibs 2 Supply 3 Way Chilled Water Control Valve Optional Retum Field piping refers to the use of hard piping using sweat adapter kit or precharged line set a A O FIELD PIPING OOOO FACTORY PIPING Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance DPN000236_Rev0 13 Site Preparation and Installation Refrigerant R 22 Piping All split systems require two sets of refrigerant lines two insulated copper suction lines and two cop per liquid lines between the evaporator and the condensing unit Two possible methods exist for installing the copper suction and liquid lines Close coupling the units together using the quick connects Using an optional Sweat Adapter Kit and hard piping between the two units All refrigeration piping should be installed with high temperature brazed joints Prevailing good refrig eration practices should be employed for piping supports leak testing evacuation dehydration and charging of the refrigeration circuits The refrigeration piping should be isolated from
86. support business critical systems Liebert solutions employ an adaptive architecture that responds e monitoring emersonnetworkpower com to changes in criticality density and capacity Enterprises benefit Outside the US 614 841 6755 from greater IT system availability operational flexibility and Single Phase UPS reduced capital equipment and operating costs 300 222 5877 upstech emersonnetworkpower com Outside the US 614 841 6755 Three Phase UPS 800 543 2378 powertech emersonnetworkpower com Environmental Systems 800 543 2778 Outside the United States 614 888 0246 Locations United States 1050 Dearborn Drive P O Box 29186 Columbus OH 43229 Europe Via Leonardo Da Vinci 8 Zona Industriale Tognana 35028 Piove Di Sacco PD Italy 39 0499719111 While every precaution has been taken to ensure the accuracy e and completeness of this literature Liebert Corporation assumes no Fax 39 049 5841 257 responsibility and disclaims all liability for damages resulting from use of Asia this information or for any errors or omissions 7 F Dah Sing Financial Centre 2007 Liebert Corporation 108 Gloucester Road Wanchai All rights reserved throughout the world Specifications subject to change without notice Hong Kong Liebert and the Liebert logo are registered trademarks of Liebert 852 2572220 Corporation All names referred to are trademarks Fax 852 28029250 or registered trademarks of their respective owners SL 1053
87. tage at 35 1 and 35 5 on interface board for 24 VAC 2 VAC If no voltage check wiring and or replace board Check wiring from control panel to board Failed humidity sensor Humidity display will indicate dashes Check wiring from temperature humidity board to the control board and from the wall box to the control board Replace wallbox or temperature humidity circuit board if remote No water flow Canister fill rate is not keeping up with the steam output Make sure switch is in Run position Check humidifier water supply including filter screen and check nylon overflow line if canister is full Check fill valve screen opening and capillary tube for obstructions Check water supply pressure minimum 10 psig Reheat will not operate DIP switch not set to enable reheat option HEAT not displayed at the control panel See DIP switch settings Table 17 Increase temperature setpoint to require heating Reheat safety open defective reheat contact or defective board Element is burned out Check voltage at P34 4 or P34 6 to P34 10 on interface board for 24 VAC 2 VAC If voltage check reheat contactor and reheat safety If no voltage check wiring and or replace board Turn off power Check element continuity with Ohm meter 58 Troubleshooting Table 18 Troubleshooting continued Symptom Cooling cycle too short Possible Cause Sensor response delay too
88. tallation 1 2 threaded rod supplied by field hanging bracket 1 O D spring 1 2 flat washer 1 2 Nylock locking nut base pan ref 1 2 hex nut Site Preparation and Installation 2 4 1 Close Coupled Installations If the evaporator and condensing units are to be mounted side to side close coupled hang each unit before connecting them together See Figure 5 If Single Point Power Kit is used install the box into the evaporator prior to suspending the units Route power wire flex conduit into condensing unit as units are suspended Refer to instructions supplied with kit for details Align bolt holes in the condensing unit and in the evaporator Insert rubber spacers and secure four 4 sets of hardware provided Align the refriger ant connections and tighten them as described in 2 4 3 Piping Connections and Coolant Require ments Remove P clamps from piping to aid fitting alignment Figure 5 Close coupled installation Condensing Unit Evaporator Isolator rubber 5 16 lock washer 5 16 capscrew 5 16 flat washer NOTE Disconnect P clamps on lines in the evaporator for easy close coupling P clamps are for shipping purposes only Site Preparation and Installation 2 4 2 Evaporator Air Distribution Filter Box The optional filter box mounts directly to the return air opening of the evaporator The filter box is supplied with two 2 20 Liebert part no A 0320 or 30
89. the humidity sensor the value shown will always be RH even though absolute humidity control may be selected If absolute humidity control is selected the Nor mal Status Display will display the adjusted reading This reading may not agree with the relative humidity reading displayed while in calibration If the sensors are subject to frequent wide temperature and humidity swings it may be necessary to shorten the cycling by increasing the sensor response time delay If the sensors are located too close to the air discharge they will likely experience rapid swings in measurement The factory default is 30 seconds Another method in reducing compressor cycling is to increase the temperature and or humid ity sensitivity Alarm Enable Each alarm can be disabled or enabled Use the UP DOWN ARROW to select a particular alarm press Enter to select either enable or disable Then press Enter again to store the change When the alarm is disabled it will NOT report to either the wallbox beeper or the common alarm relay The high water in condensate pan and high head alarms cannot be disabled NOTE The high water alarm will automatically shut the unit off 39 Microprocessor Control 3 14 Alarm Time Delay 3 15 3 16 Each individual alarm can be programmed with a time delay Table 13 causing the unit to delay a specified amount of time 0 255 seconds before recognizing the alarm The alarm condition must be present for the f
90. tions provided with the condensate pump kit Figure 7 Condensate pump installation 3 8 Compression Fitting Drain Connection Power Supply from Electric Service Power Drain Line Block in Fan Coil Module field supplied Evaporator or Chilled Water Condensate Pump Unit FRONT OF UNIT Condensate Drain 21 1 2 546mm 6 5 8 3 4 13mm FPT Condensate 168 3mm Customer Connection Pump Support Bracket i pp 3 4 13mm Hose Barb Flexible Rubber Tubing Supplied on Pump Tank Notes 1 3 4 13mm Flexible Rubber Tubing Assembly Supplied with Pump Kit must be installed on pump end 2 The High Water Safety Float included with pump must be interlocked with unit control Wire to terminals 60 amp 61 on Evaporator terminal strip to shut down unit DPNO000239_Rev0 Humidifier Water Supply Line Units supplied with the optional humidifier package have a 1 4 in 6 4 mm FPT connection for water inlet Supply pressure range is 10 psig to 150 psig Required flow rate is 1 gpm A shut off valve should be installed in this line to isolate the humidifier for maintenance NOTE DO NOT route humidifier supply line in front of filter box access panel 12 Site Preparation and Installation Chilled Water Piping Chilled water Systems Only Refer to Figure 8 for recommended field installed hardware such as shut off valves and hose bibs Chilled water supply and return lines must be in
91. tting 9 Remove the canister 10 Reverse Previous steps to re assemble humidifier paying special attention to the following WARNING Hazardous voltage use extreme caution Circuit board adjustment should be performed by qualified personnel only Power should be disconnected prior to the procedure Circuit Board Adjustments The humidifier control board governs humidifier operation There are three potentiometers mounted on the board and can be used to adjust for extreme water conductivity conditions POT2 controls the amperage at which the drain will energize and is clearly marked in percentages This adjustment is factory set at 85 which indicates that the unit will drain when the amperage falls off to 85 of the capacity setpoint Raising the value increases the frequency of drain cycles Lowering the value decreases the frequency of drain cycles The frequency should be increased for highly conductive water and decreased for less conductive water If adjustment is necessary and a change of three to four percent in either direction does not permit normal operation of the unit consult your Liebert supplier The POT controls the duration of the drain cycle This adjustment is factory set at 60 seconds 1 VDC and should not be readjusted without consulting your Liebert supplier The DIP switch settings are used to set the capacity of the humidifier If the humidifier is replaced in the field the DIP switches should be set to the r
92. ull amount of the time delay before the alarm will sound If the alarm condition is diverted prematurely the alarm will not be recognized and the time delay will automatically reset NOTE For software alarms such as loss of power and short cycle the time delay should be left at the factory default of 0 Table 13 Alarm default time delays Default Time Delay Alarm seconds Hum Prob 2 Chng Fitr 2 Custom Alarm 1 0 Custom Alarm 2 0 Custom Alarm 3 0 High Temperature 30 Low Temperature 30 High Humidity 30 Low Humidity 30 Short Cycle 1 8 2 0 Loss of Power 0 Common Alarm Enable Each individual alarm can be selected to activate deactivate the common alarm relay If the energize common alarm function is set to YES the relay is energized immediately as the alarm is enunciated and de energized when the alarm condition has cleared If the alarm is completely DISABLED the alarm has no effect on the common alarm relay Use the UP DOWN arrows to scroll to a particular alarm press the ENTER button to select it then press the ENTER key again to select Yes or No Custom Alarms The custom alarm messages can be selected from a list of standard alarm messages or the operator can write his her own message A MAXIMUM OF THREE 3 ALARM MESSAGES CAN BE CUS TOMIZED The text for custom alarms can be changed at any time by selecting CUSTOM ALARMS To change the text for a custom al
93. ure cooling components are operating compressor or valves Low The room return air temperature decreases to the low temperature alarm setpoint Check for proper setpoint value Make sure all heating components are operating e g contactors reheats etc Are reheats drawing the proper current refer to amp rating on nameplate High and Low simultaneously The simultaneous display of these two alarms results in loss of the temperature input signal or the humidity is out of sensor range 15 to 85 RH Dashes will be displayed for the temperature reading The control system will initiate 100 cooling Check for a disconnected cable or a failed sensor Humidifier Problem Alarm The Humidifier Problem Alarm will sound and display a message if any of the following humidifier conditions occur overcurrent detection fill system fault or end of cylinder life Check fault indicator LED on humidifier control board Constant LED on Overcurrent 1 second LED Flash Fill System Fault 1 2 second LED Flash End of cylinder life replace tank High Water Alarm A float switch in the evaporator pan will shutdown the evaporator on a high water level Clear the drain and reset power to the unit in order to clear the alarm Loss of Power The Loss of Power Alarm will activate after power is restored to the unit if the unit has lost power or the disconnect switch was incorrectly turned off before the unit ON OFF switch was pressed A Lie b

Liebert 60Hz User's Manual

Contents

Download Pdf Manuals

Related Search

Related Contents