Instruction/ maintenance manual of the product 8 Tons Liebert
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Precision Cooling For Business -Critic al C ontin uit y™ Li eber t M i ni - M ate 2 ™ Us e r Manu al - 8 T ons, 50 & 6 0Hz.
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i T ABLE OF CONTENTS M ODEL N UMBER N OMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V 1.0 P RODUCT F EA TURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii 2.7 Indoor Water- and Glycol-Cooled Co ndensing Unit Installa tion . . . . . . . . . . . . . . . . . . . . . . 27 2.7.1 Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iii 4.3 Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.3.1 Electric Reheat - Staged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv FIGURES Figure 1 System configurations—air cooled systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2 System Configurations— water/glycol systems . . . . . . . . . . . . . . . . . . . . . .
v M ODEL N UMBER N OMENCLATURE Evaporators and Chilled-Water Units MMD96E-AHEL0 (example) Indoor Condensing Units MCD96ALA00 (example) MM Mini-Mate2 MC Mini-Mate2 Indoor Conden sing Unit D 0 = No Disc.
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Product Features 1 1.0 P RODUCT F EATURES 1.1 St andard Product Features The Mini-Mate 2 is a temperature/hu midity control syste m designed to be insta lled above a ceilin g grid system.
Product Features 2 1.2 Optional Equipment 1.2.1 Canister Humidifier The optional, factory-installed stea m generating humidifier adds pure water vapor to the room air to control humidity.
Product Features 3 1.3 Ancillary (Shi p Loose Accessories) 1.3.1 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.
Site Prepara tion and Install ation 4 2.0 S ITE P REP ARATION AND I NST ALLATION 2.1 Inst allation Considerations The evapora tor unit i s usually mounted above the suspended ceilin g using field supp lied threaded rods. Refer to Figure 1 for possible configurations.
Site Prepara tion and Install ation 5 2.1.2 Location Considerations Locate the evaporator unit over an unobstructed floor spac e if possible. This w ill allow easy access f or routine maintenance or service. Do not attach additiona l devices to the exterior of the cabinet, as they could interfere with ma intenance or service.
Site Prepara tion and Install ation 6 Figure 1 System configurat ions—air cooled systems Figure 2 System Configurations—wate r/glycol systems Evaporator Centrifugal Fan Condensing Unit Evaporator .
Site Prepara tion and Install ation 7 Figure 3 System Configurations—c hilled water systems 2.2 System Weight s 2.3 Equipment Inspection upon receipt When the unit arrives, do not uncra te equipment until it is close to its fina l location. All required assemblies are banded and shippe d in corrugated contain ers.
Site Prepara tion and Install ation 8 2.4 Inst alling the Evaporator or Chilled -W ater Unit s The evaporator unit and indoor condensing unit are usually mounted above the ceiling and must be securely mounted to the roof structure. The ceiling and ceiling supp orts of existing buildings may require reinforcements.
Site Prepara tion and Install ation 9 2.4.1 Close Coupled Inst allations If the evaporator and condensing un its are to be mounted side-to-side (close coupled), hang each u nit before connecting them together (See Figure 5 ). If Single Point Power Kit is used, in stall the box into the evaporator prior to suspending the units.
Site Prepara tion and Install ation 10 2.4.2 Evaporator Air Distribu tion Filter Box The optional fi lter box mounts dire ctly to the return air opening of the evaporat or. The filter box is supplied with two (2) 20% (Lie bert part no. A-0320) or 30% (Liebert p art no.
Site Prepara tion and Install ation 11 2.4.3 Piping Connections and Coolant Requireme nts Drain Line A 3/4 in. (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate drain. This line also d rains the humidifi er, if applicable.
Site Prepara tion and Install ation 12 Condensate Pump The optional condensa te pu mp kit is required when the evaporator is installed below the lev el of the gravity-fed dra in line. Refer to the instal lation in struct ions provided with the condensate pump kit.
Site Prepara tion and Install ation 13 Chilled-W ater Piping—Chilled-water Systems Only Refer to Figure 8 for recommended field instal led hardwa re such as shut-o ff valves and hose bibs. Chilled-water su pply and retu rn lines must be insulate d to prevent conde nsation.
Site Prepara tion and Install ation 14 Refrigerant (R-22) Piping All split systems require tw o sets of refrigerant lines (two insu lated copper suction lines and two cop- per liquid lines) between the evaporator and the condensing uni t. Two possible methods exist for installi ng the copper suction and liquid lines.
Site Prepara tion and Install ation 15 Refrigerant Charge Requirement s: Tota l refrigerant charge ( R-22) will be required only if units are evacuated during installation or maintenanc e. For safe and effective operation, refer to 2.4.3 - Piping Connections and Coolant Requirements .
Site Prepara tion and Install ation 16 Figure 10 Evaporator or chilled-water unit dimensional dat a 49 " 21 1/2 " 1" 19 1/2 " 1" 17 1/2 " 8" 1" 47 " 1" (1244.6mm) (25 .4mm) (2 5.4mm) (25.4mm) (495.3mm) (444.
Site Prepara tion and Install ation 17 2.4.4 Electrical Connections, Evapora tor or Chilled-Water Unit Each unit is shipped from the fa ctory with intern al wiring comple ted. Refer to electrical sche- matic, Figure 11, Fi gure 25, and Figure 26 when making connections.
Site Prepara tion and Install ation 18 Figure 1 1 Evaporator unit electrical connections Fie ld s upplie d, fie ld wi red the rmost at w ire t o remote wa ll bo x. En trance f or cust omer l ow v oltag e con nectio ns Fie ld s u p plied 2 4V (NEC Clas s2 w iring) to conde nsing u nit.
Site Prepara tion and Install ation 19 2.5 Indoor Air-Cooled Centrifugal Fan Condens ing Unit Inst allation 2.5.1 Location Considerations The centrifugal fa n air-cooled condensing unit may be located above the dropped ceiling or any remote indoor area.
Site Prepara tion and Install ation 20 2.5.3 Piping Connections Details for refrigera nt (R-22) loop pipin g are in 2.4.3 - Piping Connections and Coolant Require- ments . Figure 12 Piping connections - indoor air-coo led centrifugal fan condens ing unit 2.
Site Prepara tion and Install ation 21 Figure 13 Indoor air-cooled centrifugal conde nsing un it dimensions and pipe conne ctions 7/8" (22m m) & 1 1 /8" (29m m) dia. k noc k outs el ectric al entran ce for high voltage connection Ai r Outle t 7/8" (22.
Site Prepara tion and Install ation 22 Figure 14 Indoor air-cooled centri fug al condenser electrical connec tions Removable Access Panels Con nection Term inal for Field Supplied Earth Grounding Wire. Line Vo ltage Ele ct ric Powe r Su ppl y Conduit.
Site Prepara tion and Install ation 23 2.6 Out door Air-Cooled C ondensing Unit Installation 2.6.1 Location Considerations To insure a satisfactory air supply , locate air-cooled propeller fan co ndensing uni ts in an environment providing clean air, away from l oose dirt and fore ign matter that may clog th e coi l.
Site Prepara tion and Install ation 24 Figure 15 Electrical field connect ions - out door condensing unit Field supplied unit disconnect switch. Sing le or three phas e electric service not provided by Liebert. Field supplied 24V N EC class 2 wiring to evaporator module.
Site Prepara tion and Install ation 25 Figure 16 Footprint dimens ions - out door condensing unit Model Dimensional Data in. (mm) Net Weight lbs (kg) 60 Hz 50 Hz Width (A) Height (B) Depth (C) PFC096A.
Site Prepara tion and Install ation 26 Figure 17 Piping and electrical conn ections - outdoor condensi ng unit Model Numbers Electrical Connections In.
Site Prepara tion and Install ation 27 2.7 Indoor W ater- and Glycol-Coo led Condensing Unit Installation 2.7.1 Location Considerations The condensing unit may be located above the dropped ceili ng or any remote indoor area. If noise is of concern, the condensing unit should be located away from personne l.
Site Prepara tion and Install ation 28 Figure 18 Indoor water/glycol c ondensing u n it dime nsional dat a 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.
Site Prepara tion and Install ation 29 Figure 19 Indoor water/glycol conden sing unit electrical field connections.
Site Prepara tion and Install ation 30 Figure 20 System piping with indoor water/glycol- cooled condensing unit T wo circuit s provided . Single circuit shown.
Site Prepara tion and Install ation 31 2.8 Optional Equipment Piping 2.8.1 Free-Cooling Coil (GL YCOOL) The free-cooling coil is a secondary coil located up stream of the DX coil. To take maximum advantage of availabl e free-cool ing, the secondary coil may ope r ate at the same time as the DX coil.
Site Prepara tion and Install ation 32 Figure 22 Optional free cooling coil (3-way valve) on air-cooled unit s SL-1 1088Pg12.
Site Prepara tion and Install ation 33 2.9 Checklist for Completed Inst allation ___ 1. Proper clearance for service access has been maintained around the equipment. ___ 2. Equipment is level and lock-nuts are insta lled with the leveling nuts on the spri ng isolators.
Microprocessor Control 34 3.0 M ICROPROCESSOR C ONTROL The Microprocessor Control for the Liebert M ini-Mat e2 unit features an easy to use menu- driven LCD display. The menus, control fe atures, and circuit board details are described in this section.
Microprocessor Control 35 3.2 Main Menu <Menu> Press the MENU key to display the Main Menu. The Menu sele ctions (in the fo llowing order) include: • SETPOINTS • STATUS • ACTIVE ALARMS •.
Microprocessor Control 36 3.3 Setpoint s Setpoints and system setup parameters are kept in nonvolatile memory. Selecting SETPOINTS from the Main Men u will display the following selections : • TEMPE.
Microprocessor Control 37 3.7 T ime The controller time clock must be set to allow for the setback contro l. The clock uses the 24-hour sys- tem (i.e., 12 midnight is entered 24:00).
Microprocessor Control 38 3.10.2 C/F Degrees The control may be selected to show readings and setpo ints in either degrees Fahrenheit (°F) or in degrees Cels ius (°C). To change the value use ENTER t o s e l e c t t h i s f unction, then use the UP/DO WN arrow to change the value.
Microprocessor Control 39 3.10.7 CW Flush (For Systems With a Modulat ing Chilled-W ater V alve) This function shows the interval time at which the system will perform a modulating chilled-water valve system fl ush cycle.
Microprocessor Control 40 3.14 Alarm Time Delay Each individual alarm ca n be programmed with a time delay ( Table 13 ), causing the unit to delay a specified amoun t of time (0-255 second s) before recognizing th e alarm. The alarm con dition must be present for the full amount of the time delay before the alarm will sound.
Microprocessor Control 41 3.17 Custom T ext To modify the two custom alarm messages select “CUSTOM TEXT”. Then select “Custom Text #1,” “Custom Text #2” or “Custom Text #3.
Microprocessor Control 42 3.18 Run Diagnostics By selecting Run Diagnostics, maintenance person ne l can check system inputs, out puts, and conduct a test of the microcontroller circuit board from the wall box contro l. A review of the system inputs and the microcontroller test can be done without inte rrupting normal operation.
Microprocessor Control 43 T est Micro By selecting this function, the microcontroller will perform a sel f test lasting approximately 10 sec- onds. When the test is complete, the display wi ll show the ROM checksum, ROM part number, and firmware revision number.
Microprocessor Control 44 Figure 25 Control board (inside evaporator) Figure 26 W all box board P18 P1 P2 P3 P39 P38 P40 TB P22 P36 P34 P8 P32 P35 P4 P43 P7 P25 T- P5 P16 P10 G2 G3 G4 G5 P33 P26 T+ GN.
System Performance Mic roprocessor Controls 45 4.0 S YSTEM P ERFORMANCE M ICROPROCESSOR C ONTROLS 4.1 Control T ype Respons e Proportional Control The percent requirement is determin ed by the difference between th e return air temperature and the temperature setpoint.
System Performance Mic roprocessor Controls 46 4.4 Dehumidification / Humi dification Percent Required The humidity cont rol for the MM2 is ba sed on a calculated percent re quirement for dehum idification or humidification.
Alarms 47 5.0 A LARMS The microprocessor control system will audibly and vi sually signal all ENABLED Alarms (includi ng two (2) custo m alarms). These specia l alarms can be chosen from the option al alarm list and/or can have their own fully custom text.
Alarms 48 5.1.3 Humidity The humidity alarm may be activate d under the foll owing conditions: • High: The room return air humidity exceeds the pre-set high humidity alarm setpoint. I s the unit set up for dehum idification? Check DIP switch. • Low: The room return air humidity decreases to the low humidity alarm setpoint.
Alarms 49 5.2 Optional/Custom Alarms 5.2.1 Change Filter Periodically, the return air filters in t he evaporato r must be changed. The Change Fil ter alarm noti- fies the user that filter replacem ent is necessary. A differential air pressure swit ch closes when the pressure drop across the filters becomes excessive.
System Operation, Testing, and Maintenance 50 6.0 S YSTEM O PERATION , T ESTING , AND M AINTENANCE This section describes system te sting, maintenance and replacemen t procedures. Use copies of the Maintenance Inspection Checklist to record preventive maintenance inspections.
System Operation, Testing, and Maintenance 51 6.2 Maintenance and Component Operation 6.2.1 Electric Panel The electric panel should be inspected on a semi -annual basis for any loose electri cal connections. 6.2.2 Filters Filters are usually the most neglected item in an environmental control system .
System Operation, Testing, and Maintenance 52 6.2.4 Electric Re heat Reheat element sheets and fins are manufactured with stainless steel. R egu lar inspections are neces- sary to assure prop er cleanliness of the reheating element.
System Operation, Testing, and Maintenance 53 Regulating V alves (W ater/Glycol Condensing Unit s) The water regulating valve automatically re gulate the am ount of fluid necessary to remove the heat from the refrigeration system, permitting more flui d to flow when load conditions are high and less fluid to flow when load conditions are low.
System Operation, Testing, and Maintenance 54 Replacement Procedures Compressor Replacement: Infrequently a fault in the motor insu lation may result in a motor burn- out (if system is properly installed, moto r burnout rarely occurs).
System Operation, Testing, and Maintenance 55 6.2.6 Steam Ge nerating Humidifier - Operation Procedures Steam generati ng humidifiers op erat e efficiently over a wide range of water quality conditions and automatically adjust to ch anges in the conductivity of water.
System Operation, Testing, and Maintenance 56 Replacing the Humidifier Canister The proper procedure to replac e the humidifier canister is: 1. Turn off the humidifier by lowering the humidity set point below the ambient humid ity level. Record the original setpoint.
Maintenance Inspection Checklist 57 7.0 M AINTENANCE I NSPECTION C HECKLIST JOB NAME: _________________ _____________ ROOM TEMP/HUM: __________ ____________________ SERIAL: _____________ _________________ DATE: _________________ _____________ UNIT MODEL: _____________ _________________ CO ND.
Trou bleshoot ing 58 8.0 T ROUBL ESHOOTING T able 18 T roubleshooting Symptom Possible Cause Check or Remedy Unit will not start No power to unit Check voltage at input terminal block. Control voltage fuses (at transformer) open Locate and repair short.
Trou bleshoot ing 59 Cooling cycle too short Sensor response delay too short Increase sensor response delay. See 3.12 - Ca librate Sensors . Display fr eezes and control pads do not respond Static disc harge During period of low humidity, static electricity can cause the control program to freeze or display incorrect information.
Trou bleshoot ing 60 NOTES.
Trou bleshoot ing 61.
Trou bleshoot ing 62.
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