Precision Cooling For Business-Critical Continuity™ Liebert® Mini-Mate2™ User Manual - 5 Tons, 50 & 60Hz
TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 PRODUCT MODEL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.1 Designed to Match Computer and Electronic Equipment Needs—From Installation to Operation . . . . . .
5.6 Outdoor Air-Cooled Condensing Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.6.1 5.6.2 5.6.3 5.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation. . . . . . . . . . . . . . . . . . . . . . 33 5.7.1 5.7.2 5.7.3 5.8 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Load Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 7.3.1 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.0 ALARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.1 Alarms: Definitions and Troubleshooting . . . . . . . . . . . . . . . . . . . .
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 Figure 27 Figure 28 Figure 29 Figure 30 Chilled water systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Refrigerant piping diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Important Safety Instructions IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important safety instructions that should be followed during the installation and maintenance of the Liebert Mini-Mate2. Read this manual thoroughly before attempting to install or operate this unit. Only properly trained and qualified personnel should move, install or service this equipment.
Important Safety Instructions ! CAUTION Risk of sharp edges, splinters and exposed fasteners. Can cause injury. Only properly trained and qualified personnel wearing appropriate safety headgear, gloves, shoes and glasses should attempt to move the unit, lift it, remove packaging from or prepare the unit for installation. NOTICE Risk of leaking water. Can cause equipment and building damage. Improper installation, application and service practices can result in water leakage from the unit.
Product Model Information PRODUCT MODEL INFORMATION Figure 1 Split system evaporators M = Liebert Mini-Mate2 M = Microprocessor Control D = Disconnect Switch 0 = No Disconnect Switch Nominal Capacity kBtuh E = Split Evaporator K = Evaporator w/ Free-Cooling Coil (3-way valve) M M D 60 E 7 C H E L A 7 = R-407C DX Evaporator 0 = None A = Filter Clog B = Smoke Sensor C = High-Temperature Sensor D = Filter Clog & Smoke Sensor E = Filter Clog & High-Temperature Sensor F = Smoke Sensor & High-Temperature Sens
Product Model Information Figure 3 Air-cooled systems—outdoor prop fan condensing units PFH = Prop Fan Condensing Unit w/HGBP 0 = Standard Sound Level Z = Quiet-Line Nominal Capacity, kBtuh PFH 0 67 A - A L 7 A = Air-Cooled Unit 7 = R-407C Refrigerant L = 95°F (35°C) Ambient Liebert Lee-Temp™ H = 105°F (41°C) Ambient Liebert Lee-Temp - = Standard Coil C = Coated Coil A = 460V – 3ph-60Hz B = 575V – 3ph-60Hz Y = 208/230V – 3ph-60Hz M = 380/415V – 3ph-50Hz Figure 4 Water/glycol-cooled systems—indoor co
Product Model Information Figure 5 Chilled water systems M = Liebert Mini-Mate2 M= Microprocessor Control D = Disconnect Switch 0 = No Disconnect Switch Nominal Capacity (kBtuh) C = Chilled Water M M D 92 C 2 C H E L A 2 = 2-Way Chilled Water Valve (Motorized On/Off) 3 = 3-Way Chilled Water Valve (Motorized On/Off) D = 2-Way Chilled Water Valve (Modulating) T = 3-Way Chilled Water Valve (Modulating) A = 460V – 3ph-60Hz B = 575V – 3ph-60Hz C = 208V – 3ph-60Hz D = 230V – 3ph-60Hz M= 380/415V – 3ph-50Hz H =
Introduction 1.0 INTRODUCTION 1.1 Designed to Match Computer and Electronic Equipment Needs—From Installation to Operation Installed above the ceiling, Liebert Mini-Mate2 Precision Cooling systems control the cooling, humidity and air distribution required by sensitive electronic equipment. A range of sizes and configurations is available to meet varying sites’ needs. The Liebert Mini-Mate2 is also easy to use.
Standard Features—5 Ton Systems 2.0 STANDARD FEATURES—5 TON SYSTEMS 2.1 Evaporator Section—Split System The evaporator section is designed for ceiling installation. The cabinet and chassis are constructed of heavy gauge galvanized steel. The unit can be serviced using only one side increasing its versatility in mounting locations. Mounting brackets are factory-attached to the cabinet. Internal cabinet insulation meets ASHRAE 62.
Standard Features—5 Ton Systems 2.4 System Controls System controls include a microprocessor control board mounted in the evaporator/chilled water unit and a wall-mounted interface with a two-line, 16-character liquid crystal display. A seven-key, membrane keypad for setpoint/program control, unit On/Off and alarm silence is below the LCD screen.
Optional Factory-Installed Features - Evaporator/Chilled Water Units 3.0 OPTIONAL FACTORY-INSTALLED FEATURES - EVAPORATOR/CHILLED WATER UNITS 3.1 Reheat Electric Reheat includes 304/304 stainless steel finned tubular reheat elements, with high limit safety switch. SCR Electric Reheat uses an SCR controller and unit control software to provide full cooling with modulating of the electric reheat elements to control air temperatures. Reheat capacity is up-sized to offset the cooling capacity.
Optional Factory-Installed Features - Evaporator/Chilled Water Units 3.5 Free-Cooling Free-cooling option includes separate cooling coil, three-way slow-close valve and separate supply and return piping. Free-cooling is activated when the water temperature reaches a field-adjustable temperature, typically 45°F (7°C). The valve is rated for 300psi (2068kPa) working pressure.
Optional Factory-Installed Features - Evaporator/Chilled Water Units 3.8 Optional Configurations—Chilled Water Units Chilled Water Units are also available with the following valve options: • Three-way, slow-close, motorized chilled water valve rated for 300 psi (2068kPa) working pressure. Valve is non-spring return. • Two-way modulating chilled water valve, rated for 400psi (2758kPa) operating pressure, 72psi (496kPa) close-off rating. Valve is non-spring return.
Ship-Loose Accessories—Field-Installed 4.0 SHIP-LOOSE ACCESSORIES—FIELD-INSTALLED Filter Box includes filter box with 1" (25.4mm) duct flange connection, quantity 2, 20" x 20" x 4" nominal (508mm x 508mm x 102mm) filters and a 1" (25.4 mm) duct flange for use on the supply air opening. Filters are MERV 8 efficiency per ASHRAE Standard 52.2-2007. Condensate Pump is equipped with a discharge check valve.
Ship-Loose Accessories—Field-Installed Liebert SiteScan® is a monitoring solution that gives you decision-making power to effectively manage the equipment critical to your business. Liebert SiteScan enables communication from Liebert Precision Cooling and Power Protection units, as well as many other pieces of analog or digital equipment, to a front-end software package that provides real-time status and alarms so you can react quickly to changing situations.
Site Preparation and Installation 5.0 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. 5.1 Installation Considerations The evaporator unit is usually mounted above the suspended ceiling in the space to be conditioned.
Site Preparation and Installation 5.1.2 Location Considerations ! CAUTION Risk of leaking water/glycol. Can cause equipment, furniture and building damage. Do not mount units over equipment or furniture that can be damaged by leaking water /glycol. Install a watertight drain pan with a drain connection under the cooling unit and ceiling mounted water-cooled condensing unit. Route the drain line to a frequently used maintenance sink so that running water can be observed and reported in a timely manner.
Site Preparation and Installation Figure 9 Water/glycol cooled systems Cooling Tower Drycooler Evaporator Evaporator Water/Glycol Condensing Unit Water/Glycol Condensing Unit Split System Evaporator Supply & Return Air Ducted Remote Water/Glycol Condensing Unit Split System Evaporator Supply & Return Air Ducted Remote Water/Glycol Condensing Unit Figure 10 Chilled water systems Evaporator Chilled Water Fan Coil Supply & Return Air Ducted Remote Chilled Water Source 5.
Site Preparation and Installation 5.3 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 it to the shipper and to your Liebert supplier. 5.
Site Preparation and Installation Connections for Ducted Systems Use flexible duct work or non-flammable cloth collars to attach duct work to the unit and to help control 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.
Site Preparation and Installation Chilled Water Piping—On chilled water units install manual service shut-off valves at the supply and return lines of each unit. These shut-off valves are used for routine service or emergency isolation of the unit. Chilled water supply and return lines must be insulated. Insulating them will prevent condensation of the water supply and return lines to the unit. The minimum recommended water temperature is 42°F (5.5°C). Connection sizes are 1-1/8" (28.6mm) OD copper.
Site Preparation and Installation Figure 11 Refrigerant piping diagram Pitch down 1/2" (13mm) per 10 ft. (3m) 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 level drop to condensing unit is 15 ft. (4.6m) .
Site Preparation and Installation Total refrigerant = Units and Lines* Table 11 Refrigerant charge Model # 60Hz R-407C, oz (kg) 50Hz MM*60E MM*59E 4 (0.11) MM*60K MM*59K 4 (0.11) MC*65A MC*64A 432 (12.3) MC*69W MC*68W 94 (2.7) PFH067A-_L7 PFH066A-_L7 426 (12.1) PFH067A-_H7 PFH066A-_H7 827 (23.4) PFHZ67A-_L7 PFHZ66A-_L7 827 (23.4) All evaporator units and condensing units are fully factory-charged with refrigerant.
Site Preparation and Installation Figure 12 Evaporator unit dimensional data Optional Discharge Air Duct Flange Supplied when Optional Filter Box is Ordered 14 1/2" (368.3mm) Air Outlet Air Inlet 13-3/8" (339.7mm) 46-1/2" (1181.1mm) Cabinet Dimension 7-5/8" (193.5mm) 13-3/8" (339.7mm) 3-1/8" (79.4mm) 14-1/2" Removable (368.3mm) Access Panels 24" (610mm) Cabinet Dimension 22-7/16 " 7/8" (22mm) Holes for Module Rigging (typ. 2 each end) (570mm) 13/16" (20.6mm) 1-1/8 " (28.
Site Preparation and Installation Figure 13 Threaded rod and hardware kit installation 3/8" Threaded Rod (field-supplied) 3/8" Hex Nut 3/8" Washer Sleeve Isolator 3/8" Fender Washer 3/8" Hex Nut 3/8" Hex Nut Nylock Unit Base Pan (ref) 5.4.4 Electrical Connections Each unit is shipped from the factory with internal wiring completed. Refer to electrical schematic when making connections. Electrical connections to be made at the installation site are: • Power supply to each ceiling unit.
Site Preparation and Installation Power Connections All power and control wiring and ground connections must be in accordance with the National Electrical Code (NEC) and local codes. Refer to Unit serial tag data for electrical requirements. ! WARNING Risk of loose electrical wiring connections. Can cause overheating of wire, smoke and fire resulting in building and equipment damage, serious injury or death. Use copper wiring only. Verify periodically that all connections are tight.
Site Preparation and Installation Figure 14 Evaporator unit electrical connections Earth Ground Connection terminal for field-supplied earth grounding wire High-Volt Power Connections Electric service connection terminals Factory-installed disconnect switch Remote Humidifier Contact Field-Supplied 24V Class 2 wiring to Terminals 11 & 12, located in field wire compartment Optional Condensate Pump Auxilary Float Switch Connection to Terminal TB1-8 and TB1-9. Heat Rejection Connection.
Site Preparation and Installation Figure 15 Close coupled installation Evaporator Unit (Left) Condensing Unit (Right) Evaporator Unit Spacer Between Close-Coupled Evaporator and Condensing Unit (4 places) Condensing Unit Refrigerant Quick Connect Fittings (Inside Units) Liebert® Mini-Mate2™ 26
Site Preparation and Installation 5.5 Indoor Air-Cooled Centrifugal Fan Condensing Unit Installation NOTE Follow all national and local building, electrical and plumbing codes. 5.5.1 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.
Site Preparation and Installation Figure 16 Indoor air-cooled centrifugal condensing unit dimensions and pipe connections 54" (1371.6mm) Cabinet Dimension Field-supplied threaded rods for module support from ceiling (typ. 4) 1-5/8" (41.1mm) 32" (812.8mm) Cabinet Dimension 15-3/4" (400mm) 48" (1219.2mm) 8-15/16" (227mm) 3-3/8" (85.7mm) 14-1/2" (368.3mm) 24" (610mm) Cabinet Dimension 21-1/4" (539.8mm) 1-3/4" (44.5mm) 33-5/8" (854.
Site Preparation and Installation Figure 17 Indoor air-cooled centrifugal condenser electrical connections Field-Supplied Unit Disconnect Switch when Factory Unit Disconnect Switch is not Supplied Electric Service not by Emerson Factory-Installed Disconnect Switch AIR COOLED Line Voltage Electric Power Supply Conduit Voltage Connection Terminal for Field-Supplied Earth Grounding Wire Removable Access Panels Field-Supplied 24V NEC Class 2 Wiring Between Condensing Unit and Fan/Coil Unit Low-Voltage E
Site Preparation and Installation Figure 18 System piping with indoor or outdoor air-cooled condensing unit Condenser Coil Scroll Compressor AIR-COOLED (Split System) High-Pressure Switch Hot Gas Bypass Solenoid Valve Liquid Injection Valve Bulb Suction Line Male Quick Connect Coupling 3-Way Head Pressure Relief Valve Suction Line Female Quick * Connect Coupling Sensing Bulb External Equalizer Hot Gas Bypass Control Valve Sight Glass Filter Drier Expansion Valve Liquid Line Male Quick Connect
Site Preparation and Installation 5.6 Outdoor Air-Cooled Condensing Unit Installation NOTE Follow all national and local building, electrical and plumbing codes. 5.6.1 Location Considerations To ensure 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.
Site Preparation and Installation Figure 20 Dimensions—Air-cooled systems, high ambient and Quiet-Line condensing module Guard Height 5-1/2" (140mm) Top Air Discharge Right Air Intake 36-1/4" (918) Left Air Intake Shaded area indicates a minimum clearance of 18" (457mm) for proper air flow 2" (51mm) 53" (1346mm) Shaded area indicates a minimum clearance of 18" (457mm) for proper air flow Table 15 Removable front panel for access to high-voltage and low-voltage connections and to refrigeration compo
Site Preparation and Installation 5.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation NOTE Follow all national and local building, electrical and plumbing codes. 5.7.1 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.
Site Preparation and Installation Figure 21 Indoor water/glycol condensing unit dimensional data NOTE: Unit is evenly spaced in reference to threaded rod centers. 32" (812.8mm) Cabinet Dimension 32" (812.8mm) Cabinet Dimension Field-supplied threaded rods for module support from ceiling typ. 4). Removable Access Panel 1/2" (12.7mm) dia. holes for module rigging (typ.
Site Preparation and Installation Figure 22 Indoor water/glycol condensing unit electrical field connections Field-Supplied Unit Disconnect Switch when Factory Unit Disconnect Switch is not Supplied Electric Service not by Emerson Factory-Installed Disconnect Switch WATER/GLYCOL Field-Supplied 24V NEC Class 1 Wiring to Fan/Coil Unit Field-Supplied 24V NEC Class 1 Wiring to Drycooler (Glycol-cooled units only) Line Voltage Electric Power Supply Conduit Voltage Removable Access Panel Connection Terminal
Site Preparation and Installation Figure 23 System piping with indoor water/glycol cooled condensing unit Scroll Compressor High-Pressure Switch Liquid Injection Valve Bulb Suction Line Male Quick Connect Coupling External Equalizer Suction Line Female Quick * Connect Coupling Sensing Bulb Tube-in-Tube Condenser Hot Gas Bypass Solenoid Valve Tube-in-Tube Condenser ss Bypa Gas alve t o H tr o l V Con Water/Glycol Return Line Water/Glycol Fluid Return Supply Line Liquid Injection Valve From Unit
Site Preparation and Installation Figure 24 Optional free-cooling coil (3-way valve) on water/glycol units Bleed Valve Fluid Return From Unit Fluid Supply To Unit Tube in Tube Condenser Free-Cooling Control Valve Shutoff* Valves Fluid Return From Unit Free-Cooling Coil Temperature Stat Shutoff* Valves Hose* Bibs Hose* Bibs Fluid Supply To Unit FIELD PIPING NOTE: RECOMMENDED PIPING FOR UNITS WITH FREE-COOLING COIL OPTION AND WATER/GLYCOL CONDENSER.
Site Preparation and Installation 5.9 Checklist for Completed Installation ___ 1. Proper clearance for service access has been maintained around the equipment. ___ 2. Equipment is level and mounting fasteners are tight. ___ 3. Piping completed to refrigerant or coolant loop (if required). Refrigerant charge added (if required). ___ 4. Condensate pump installed (if required). ___ 5. Drain line(s) connected and checked for leaks. ___ 6. Water supply line connected to humidifier (if required).
Microprocessor Control 6.0 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 (7.0 - System Performance Microprocessor Controls) and alarms (8.0 - Alarms) are provided. 6.1 Feature Overview To turn the unit ON, press the ON/OFF (I/O) key after power is applied.
Microprocessor Control 6.2 Main Menu
Microprocessor Control Table 16 Default setpoints and allowable ranges Setpoint 6.4 Default Range Temperature Setpoint 72°F 40-90°F (5-32°C) Temperature Sensitivity 2.0°F 1-9.9°F (0.6-5.
Microprocessor Control 6.9 Setup Operation Selecting Setpoint/Setup from the Main Menu will display the following selections: • • • • • • RESTART TIME DELAY C/F DEGREES HUMIDITY CONTROL METHOD SHOW DIPSWITCH CW FLUSH VALVE TIME Use the Up and Down arrows to scroll through the submenu. Press Enter to select a particular function. 6.9.1 Restart Time Delay This function delays unit restart after main power is restored to the unit.
Microprocessor Control 6.9.5 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. The full valve travel time is used by the control to determine the appropriate valve position.
Microprocessor Control 6.12 Alarm Enable Each alarm can be disabled or enabled. Use the Up and Down arrows to select a particular alarm, press Enter to select either Enable or Disable. Press Enter again to store the change. When the alarm is disabled it will NOT report to either the wall box beeper or to the common alarm relay. NOTE The high-water alarm will automatically shut the unit Off, even if the alarm is disabled.
Microprocessor Control 6.15 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 TWO (2) ALARM MESSAGES CAN BE CUSTOMIZED. The two custom alarm messages will initially display the previously programmed message but can be changed. The text for custom alarms can be changed at any time by selecting Custom Alarm. To change the text for a custom alarm, select the alarm you would like to change, 1 or 2.
Microprocessor Control Equipment Options Switches Equipment options are selected and enabled using DIP switches 1 through 7. These are located on the control board near TB1. 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.
Microprocessor Control Test Outputs When this feature is selected, the controller is effectively turned off. When stepping from one load to the next, the previous load is automatically turned off. The loads can also be toggled On and 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 seconds On to prevent damage.
Microprocessor Control Figure 27 Control menu Setpoints/Setup Temp Setpt Temp Sens Hum Setpt Hum Sens Hi Temp Alm Lo Temp Alrm Hi Hum Alm Lo Hum Alm Status Heat % Dx Cool % Dehumidify % Humidify % Status Display 75 F 50%RH NO ALARMS Setup Password Enter New PSW Setup PSW = 000 Calibrate sensors Temp Cal Hum Cal Temp Delay Hum Delay 0 0 0 0 Active Alarms No Alarms or Alarm 01 of 01 High Head Menu Setpoints Status Active Alarms Time Date Setback Setup Operation Setpoint Password Setup Password Calibrate
Microprocessor Control Figure 28 Control board—inside evaporator TB2-4 — Hot Gas Bypass TB2-3 — High Head Alarm Connection TB2-2 — Heat Rejection TB2-1 — Heat Rejection TB1-9 — Condensate Pump Aux Alarm TB1-8 — Condensate Pump Aux Alarm TB1-7 — Common Alarm Connection TB1-6 — Common Alarm Connection TB1-5 — Remote Shutdown TB1-4 — Remote Shutdown TB1-3 — Customer Alarm Connection #2 TB1-2 — Customer Alarm Connection #1 TB1-1 — Customer Alarm Connection (common) TB3-4 TB3-3 TB3-2 TB3-1 Connection to TB3 P
System Performance Microprocessor Controls 7.0 SYSTEM PERFORMANCE MICROPROCESSOR CONTROLS This section describes in detail how the Mini-Mate2 responds to operator inputs and room conditions. 7.1 Temperature Control 7.1.1 Cooling/Heating Required The temperature control program for the microprocessor is based on a calculated percentage requirement for cooling/heating. 7.1.
System Performance Microprocessor Controls 7.2.3 Humidification Operation The canister humidifier is activated when the humidity control calculates a requirement of 100% humidification; and is deactivated when the humidification requirement falls below 50%. 7.3 Load Control Features The control system monitors the compressor and prevents it from turning on within a 3 minute period of being off. If this on-off-on cycle occurs too often (e.g., 10 times in one hour) a Short Cycle Alarm will occur. 7.3.
Alarms 8.0 ALARMS The microprocessor control system will audibly and visually signal all ENABLED Alarms (including two (2) custom alarms). These special alarms can be chosen from the optional alarm list and/or can have their own fully custom text. The custom alarm inputs are contact closures wired from terminal TB1-1 through a normally open contact to either TB1-2 (alarm 1) or TB1-3 (alarm 2). The alarms can be enabled or disabled (refer to 6.
Alarms Air-Cooled Systems Check for power shut Off to the condensing unit, condenser fans not working, defective head pressure control valves, closed service valves, dirty condenser coils and crimped lines. Also, make sure that when the compressor contactor is energized, the side switch on the contactor closes to energize the control circuit on the condensing unit. Water/Glycol/ Systems Check water regulating valves. Verify water/glycol flow (i.e., pumps operating and service valves open).
Alarms 8.1.7 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 Liebert remote monitoring unit (optional) will immediately indicate loss of power. 8.1.8 Short Cycle A Short Cycle Alarm will occur if the compressor system has exceeded 10 cooling start attempts in a one-hour period.
System Operation, Testing and Maintenance 9.0 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 inspections. ! WARNING Risk of electric shock. Can cause injury or death. Open all local and remote electric power disconnect switches before working within the electrical enclosures.
System Operation, Testing and Maintenance 9.2.3 Blower System Monthly inspection of the blower package include: 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 bearings 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.
System Operation, Testing and Maintenance Discharge Pressure The discharge pressure will vary greatly with load and ambient conditions (Table 23). The highpressure switch will shut the compressor down at its cut-out setting. Table 23 Typical discharge pressure System Design Discharge Pressure, psig (kPa) Air-Cooled 200-300 (1380-2070) Water-Cooled 65 to 85°F water (18 to 29.
System Operation, Testing and Maintenance Hot Gas Bypass 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.
System Operation, Testing and Maintenance 9.3 Replacement Procedures 9.3.1 Compressor Replacement Infrequently a fault in the motor insulation may result in a motor burnout (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.
System Operation, Testing and Maintenance Replace a Failed Compressor Proper procedures to remove and replace the failed compressor are: 1. Disconnect power 2. Attach suction and discharge gauges to access fittings. 3. Recover refrigerant using standard recovery procedures and equipment. Use a filter-drier when charging the system with recovered refrigerant. NOTE Release of refrigerant to the atmosphere is harmful to the environment and unlawful.
System Operation, Testing and Maintenance 9.3.3 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 set point and alert the operator when the humidifier canister needs to be replaced. The humidifier RUN/DRAIN switch is located in the humidifier assembly.
System Operation, Testing and Maintenance Replacing the Humidifier Canister ! CAUTION Risk of contact with extremely hot surfaces. Can cause injury. Canister and steam hose may be hot. Do not attempt to replace parts until the humidifier has cooled down to a temperature that is safe for human contact. Use extreme caution and wear thermally insulated gloves and arm protection when replacing the humidifier canister. The proper procedure to replace the humidifier canister is: 1.
Maintenance Inspection Checklist 10.0 MAINTENANCE INSPECTION CHECKLIST Liebert Mini-Mate2 Date:____________________________________ Prepared By:____________________________________ Model #:_________________________________ Serial Number:__________________________________ NOTE Reheat element sheaths and fins are manufactured with stainless steel. Regular inspections are necessary to assure proper cleanliness of the reheating element.
Troubleshooting 11.0 TROUBLESHOOTING Table 25 Troubleshooting Symptom Unit will not start No cooling Compressor high head pressure Humidifier does not operate Reheat will not operate Liebert® Mini-Mate2™ Possible Cause Check Or Remedy No power to unit Check voltage at input terminal block. Control voltage circuit breaker (at transformer) open Locate short and reset circuit breaker.
Troubleshooting Table 25 Troubleshooting Symptom Possible Cause Check Or Remedy Cooling cycle too short Sensor response delay too short Increase sensor response delay. See 6.11 - 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.
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