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Precision Cooling
For Business-Critical Continuity
Liebert Challenger ™ 3000
Technical Data Manual - Floor Mounted Systems, Nominal 3 & 5 Ton Systems, Air Cooled, Water/Glycol
Cooled, GLYCOOL, Chilled Water, Split Systems, 50 & 60 Hz
NOTE
Tables i, ii and iii show nomenclature for the complete range of all available product options.
Not all combinations are possible. For assistance, contact your local dealer, Liebert representative or call 1-800-543-2778.
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Figure 1 Unit configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 2 Unit configurations, continued. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 3 Microprocessor control systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 4 Optional Views With Advanced Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 5 Upflow GLYCOOL Challenger 3000 with front return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 6 Chilled water Challenger 3000 downflow with top return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 7 Air cooled condenser with Lee-Temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8 Outdoor propeller fan condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9 Upflow GLYCOOL Challenger 3000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 10 Cabinet and floor planning dimensional data—Upflow (BU/BK) models . . . . . . . . . . . . . . . . . . . 32
Figure 11 Cabinet and floor planning dimensional data—Downflow (BF/BE) models . . . . . . . . . . . . . . . . . 33
Figure 12 Cabinet and floor planning dimensional data—3-ton centrifugal fan condensing unit . . . . . . . . 34
Figure 13 Cabinet and floor planning dimensional data—Split system—5-ton centrifugal fan condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 14 Cabinet and floor planning dimensional data—Split system—3-ton water/glycol cooled condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 15 Cabinet and floor planning dimensional data—Split system—5-ton water/glycol cooled condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 16 Cabinet and floor planning dimensional data—Split System—Propeller fan condensing unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 17 Cabinet and floor planning dimensional data—Propeller fan condensing modules—Vertical air discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 18 Cabinet and floor planning dimensional data—Self-contained system—Air cooled condenser or drycooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 19 Cabinet and floor planning dimensional data—Piggyback condenser. . . . . . . . . . . . . . . . . . . . . . 37
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Table 1 Condensate pump capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 2 Challenger 3000 air cooled data—60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 3
Table 4
Air cooled data—50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Water cooled data—60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 5
Table 6
Table 7
Table 8
Table 9
Water cooled data—50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Glycol Cooled/GLYCOOL Data—60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Challenger 3000 electrical data—60 Hz 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Self-contained with SCR reheat * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Scroll compressor and main fan (for comparison purposes only) * . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 10 Outdoor condensing units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 11 Indoor condensing units, air cooled *. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 12 Indoor condensing units, water cooled * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 13 Fan speed control condensers * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 14 Lee-Temp condensers *. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 15 Lee-Temp receiver heater pads for use w/CSL condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 16 Drycooler & pump package - 95°F (35°C) ambient *. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 17 Drycooler only - 95°F (35°C) ambient * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 18 Pumps * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 19 Challenger 3000 electrical data—50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 20 Scroll compressor and main fan (for comparison purposes only) . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 21 Outdoor condensing units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 22 Indoor condensing units air cooled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 23 Self-contained with SCR reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 24 Indoor condensing units water cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 25 Fan speed control condensers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 26 Lee-Temp condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 27 Lee-Temp receiver heater pads; for use w/CSL condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 28 Drycooler & pump package - 35°C (95°F) ambient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 29 Drycooler only - 35°C (95°F) ambient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 30 Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
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For sensitive electronics, environmental control is more than simple cooling. “Comfort” air conditioning systems are designed for the comfort of people and simply cannot provide the kind of environment required by high performance computer or communication equipment.
The high density heat load in a computer room or other similar application is beyond the capacity of ordinary air conditioning systems.
Sensitive electronics are best maintained in a stable environment of 72°F ±2°F (22.2°C ±1°C). Because computers and communications equipment generate large quantities of heat in small areas, six to 10 times the heat density of normal office space, the air conditioning system must have more than just enough cooling capacity. It must have the precision to react quickly to a drastic change in heat load and prevent wide temperature fluctuations—something a large building system cannot do.
A clean environment of properly filtered air is essential. Build-up of dust and fibers attracted by operating electronics can cause faults and impair the operation of electromechanical devices, such as switches and disk drives.
In short, today’s electronics need the same precision environmental control that mainframe computers need. The difference is that instead of one large computer room there are several small, often crowded rooms, widely dispersed throughout a building, plant or campus. Conditions and requirements can vary widely.
Comfort conditioning systems cannot be relied upon
24 hours per day 365 days per year. They are typically designed to operate 10 hours per day, from spring to autumn. Many “comfort” systems have no provision for winter operation. A precision environmental control system is designed for operation at temperatures down to -30°F (-34.4°C).
The electronic equipment must be protected from both internal condensation and static electricity discharges.
Maintaining the correct humidity level in the room is just as important as maintaining proper temperature. When humidity is too high, condensation may form inside electronic equipment and damage it. If humidity is too low, static electricity could disrupt operation or even shut down the electronic system.
An ordinary building system cannot normally control the environment within these boundaries.
Standard 60 Hz units are UL listed and CSA
(NRTL-C) certified. NRTL-C meets both U.S. and Canadian government safety requirements, providing fast, hassle-free inspection and building code approvals. The units are also MEA listed for New York City applications.
Computers and other sensitive electronics require greater air volumes than ordinary air conditioning can provide. Typical comfort systems are designed to provide between 300 and 400 CFM (cubic feet per minute), (500–700 CMH) per ton of cooling. Computer systems require between 500 and 600 CFM
(850–1020 CMH) per ton. The high density heat load in a relatively small space requires more changes of air than a less dense “comfort” application.
While a normal office space requires only two air changes per hour, a room filled with electronic equipment requires up to 30 changes per hour. Without proper air volume, hot spots and temperature fluctuations could develop within the room. Also, greater air volumes provide the higher sensible heat ratios required by electronic computer equipment.
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Data processing power is moving from the specialized environment of the computer room to the office and the factory floor.
At the same time, the applications are growing exponentially. From yesterday’s spreadsheets and word processors, micro- to mid-range computers control
LANs and WANs, manage complex telecommunications systems, optimize manufacturing processes and facilitate sophisticated testing and laboratory functions.
Computers and sensitive electronics tend to be grouped, often in specialized rooms. This makes operation and service easier, but it also creates the need for precision environmental control—the coordinated management of temperature, humidity and air filtration.
Challenger 3000 provides the precision and flexibility required by a broad range of applications.
• Microprocessor-based controls (with a choice of monitoring systems based on your needs) allow you to select temperature and humidity ranges.
• A-frame coil (oriented to airflow) provides a large cooling surface area, and more precise control of temperature and humidity.
Though electronic equipment rooms share some common protection requirements, their application requirements can vary greatly. The room may or may not have a raised floor or an existing heat rejection loop. Budget and space requirements may limit the options a contractor has.
The Challenger 3000 is available in 10 different configurations, with upflow and downflow air distribution options.
The Challenger 3000 occupies 7 square feet
(.65 square meters) of floor space. It can be located in a corner of the room or against a wall, as all service access is from the front of the unit. With room floor space valued at a premium per square foot, the small footprint of the Challenger 3000 makes economic good sense.
GLYCOOL is a patented Liebert process that can significantly reduce energy costs during periods of low outdoor ambient temperatures.
The GLYCOOL system is a normal glycol system with the addition of a second cooling coil in the air handling unit and a three-way valve. During colder months, the glycol solution returning from the outdoor drycooler is routed to the second coil, and becomes the primary source of cooling for the room.
At ambient temperatures below 35°F (1.6°C), the cooling capacity is sufficient to handle the total cooling needs of the room. As the compressor is responsible for the majority of the power consumption of the air conditioning unit, a GLYCOOL system can substantially reduce energy costs.
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Two levels of microprocessor control systems are available providing precise control and monitoring of the critical space.
The Advanced Microprocessor is standard, and the Advanced Microprocessor with Graphics is optional. The main control functions are similar for both controls.
The user must enter a three-digit password before making changes.
• Temperature Setpoint 65-85°F (18-29°C)*
• Temperature Sensitivity +1-10°F (0.6-5.6°C)
• Humidity Setpoint 20-80% RH*
• Humidity Sensitivity 1-30% RH
• High Temperature Alarm 35-90°F (2-32°C)
• Low Temperature Alarm 35-90°F (2-32°C)
• High Humidity Alarm 15-85% RH
• Low Humidity Alarm 15-85% RH
* The microprocessor may be set within these ranges; however, the unit may not be able to control to extreme combinations of temperature and humidity.
Factory set-up for Intelligent Control which uses
“fuzzy logic” and “expert systems” methods. Proportional and Tunable PID are user selectable options.
• Compressor short cycle control: Prevents compressor short-cycling and needless compressor wear.
• System auto restart: The auto restart feature will automatically restart the system after a power failure. Time delay is programmable.
• Sequential Load Activation: On initial start-up or restart after power failure, each operational load is sequenced to minimize total inrush current.
• Hot Water / Econ-O-Coil Flush Cycles: Hot water reheat coils and Econ-O-Coils are periodically flushed to prevent a build-up of contaminants.
• Temperature/Humidity Sensor Calibration:
The sensors may be calibrated from the front monitor panel to insure that all units in the room are similarly calibrated, assuring greater precision.
• Normal display: Includes present room temperature and humidity, active functions (cooling, heating, dehumidifying), and any alarms.
• Operating status: Displays each control operation in percent.
• Read analog inputs function: Displays the present values of up to four analog inputs.
• Input diagnostics: Reviews inputs to the control system.
• Control board diagnostics: Initiates a self-test of the control system.
• Output diagnostics: Tests major components by turning them on and off from the control panel. Includes: main fan, compressor, liquid line solenoid valve, hot gas bypass valve, chilled water or chilled GLYCOOL valve, R-5 relay, reheat, hot water reheat valve, humidifier, humidifier make-up valve, and common alarm.
• Alarm history log: The Advanced Microprocessor displays the 10 most recent alarms. The
Advanced Microprocessor with Graphics displays the most recent 60 alarms. Both provide a time and date stamp for each event
• Run time log: Displays run time and hours for major components (also allows reset of run hours) including compressors, GLYCOOL, fan, humidifier, and reheat.
• Humidifier problem
• High head pressure
• Change filter
• Loss of air flow
• High temperature
• Low temperature
• High humidity
• Low humidity
• Compressor overload (opt)
• Main fan overload (opt)
• Low suction pressure
• Short cycle
• Loss of power
• Custom alarm (choose up to 4)
• Water under floor
• Smoke detected
• Standby GC pump on
• Loss of water flow
• Standby unit on
• User customized text
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• Individual plots of temperature, humidity and the four analog inputs.
• Bar graph plots of individual component run history by hour.
• Floor plan of optional water detection system layout including on alarm.
Status indication of operating modes with current temperature and humidity.
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The frame, 14 gauge, MIG welded tubular and formed steel, provides maximum support while 1"
(25.4mm) deep steel panels with 1-1/2 lb. (.68 kg) insulation protect and quiet the system. The front door can be opened for service without shutting off the system. All components are accessible for service/ maintenance through the front of the unit.
Liebert enhances the Challenger 3000’s resistance to corrosion by applying a black, powder-coat finish to all frame components. Exterior panels are similarly protected with durable powder-coating.
The high voltage compartment contains the contactors, transformers and overloads and all other highvoltage components.
Each high voltage component is protected by a separate overcurrent protective device. The entire high voltage panel is enclosed by a safety lock dead front panel. When the front door is opened by operating personnel, the high voltage components remain enclosed for operator safety.
The Challenger 3000 features a quiet, low speed fan assembly with double inlet blower, lifetime lubrication and self-aligning ball bearings. The motor and variable pitch drive are mounted on an adjustable base. The entire blower/ motor assembly is mounted on vibration isolators for smoother operation.
The draw-through design of the fan section provides even air distribution across the coil, controlled air for bypass humidification, elimination of air bypass around the filters and low internal cabinet pressure drop.
High-intensity quartz lamps over the stainless steel humidifier pan permit clean, particle-free vapor to be added to the air within 5 to 6 seconds of the electronic call from the microprocessor control.
The quartz lamps provide radiant energy that evaporates water in a pure state, without solids.
The Infrared Humidifier is equipped with an automatic water supply system that significantly reduces cleaning maintenance. This system has an adjustable water over-feed to prevent mineral precipitation. A drain valve is provided to easily empty the humidifier pan prior to inspection or servicing. A control valve regulates flow at water pressures between 5 and 150 psig (34.5 and 1034 kPa) and includes a Y-strainer.
The two-stage 304 stainless steel reheat elements are a rigid, fin-tubular design that have extended operation life. The reheat has ample capacity to maintain room dry-bulb conditions during a system call for dehumidification. The two stages give an accurate, controlled response to the requirements of the computer room. The low watt density, electrically enclosed elements are surrounded by the tube and fins, reducing sheath temperatures and eliminating ionization.
The standard pleated 2" (51mm) filter with an efficiency of 20% (based on ASHRAE 52.1) can be changed quickly and easily through the front of the unit.
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The chilled water cooling coil is designed for closedloop applications using properly maintained water. It is constructed of copper tubes and aluminum fins. Aframe coils are used on downflow units and V-frame coils are used on upflow units. To ensure quality, the coil is manufactured to the highest standards in the industry.
The flow of chilled water through the cooling coil is controlled by an electronic modulating motor. The microprocessor control will activate the motor when a need for cooling or dehumidification exists. The motor will position the valve to precisely match the needs of the conditioned space.
All chilled water piping within the Challenger 3000 is fully insulated to assure full system capacity and prevent condensation.
The fully insulated control valve gives the conditioned space the precise cooling needed by electronic equipment. Its unique design requires no overtravel linkages and never requires adjustment.
The flow switch will activate the alarm system and/ or shut down the system should the chilled water supply be interrupted. The switch is factory wired and mounted in the chilled water valve compartment.
For special applications, a high pressure, modulating
3-way or 2-way valve can be provided. The valve is designed for 400 psig (2758 kPa) water pressure.
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Two versions are available:
1. Self-Contained Systems
2. Split Systems
These systems feature a scroll compressor and controls, expansion valve, hot gas bypass and evaporator coil in the room unit.
Air Cooled models also include a crankcase heater on the compressor and require field connection to remote air cooled condenser.
Water, Glycol and GLYCOOL models also include a coaxial condenser with field connections required to the water or glycol coolant loop.
Water/Glycol models have 2-way WRV with bypass.
GLYCOOL models have 3-way WRV.
These pre-charged systems feature the evaporator coil and expansion valve in the room unit, with the scroll compressor, and the condensing equipment located in one of several different types of condensing units. Pre-charged line sets are available on 3-ton systems.
The heart of the refrigeration system is the compressor.
All self-contained evaporator units and split system condensing units contain a high efficiency, quiet operating scroll compressor. The compressors have internal vibration isolating mountings, pressure safety controls and built-in overload protection.
The evaporator coil is designed for the high sensible heat ratio required by electronic equipment applications. The copper tube, aluminum fin coils are configured as Aframe coils on downflow units and V-frame coils on upflow units for smooth air flow through the unit.
Every Challenger compressor has a high pressure switch with an exclusive manual reset after high pressure cut-out. This prevents cycling the compressor at high pressure, resulting in greater efficiency and longer compressor life.
The externally equalized thermostatic expansion valve smoothly controls the flow of refrigerant through the coil and provides precise control of superheat.
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The compressor pump-down control is accomplished by a liquid-line solenoid valve used in conjunction with a low pressure switch.
The Liebert manufactured low profile, direct drive propeller fan type air cooled condenser provides quiet, efficient operation.
It is constructed of aluminum with a copper tube and aluminum fin coil for corrosion resistance. An integral, factory wired and tested control panel reduces installation time.
The winter control system features a variable speed motor and a specially designed solid-state fan speed control transducer.
The transducer senses refrigerant pressure and varies the speed of the fan motor to maintain constant condensing temperature and system capacity. This system permits operation at ambient temperatures as low as -20°F (-29°C).
The Lee-Temp winter control system’s heated receivers permit startup and positive head pressure control at ambient temperatures as low as -30°F (-34.4°C).
The Lee-Temp package includes insulated receiver, a pressure relief valve, three-way head pressure control valves, and rotalock valves (see Figure 7 below).
The Series PB condenser converts the Challenger
3000/Lee-Temp system into a self-contained package when an outdoor location is not practical.
Quiet-Line Condensers can help your facility meet the strictest noise codes, and do so at less cost than traditional condensers with acoustical shielding.
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The centrifugal condensing unit may be connected to the evaporator section by means of pre-charged refrigeration lines (3 ton only). This greatly simplifies installation and keeps installation costs low. The copper-tube, aluminum-fin coil is equipped with low temperature controls to assure year-round operation to -20°F (-29°C). The condensing unit is completely factory wired, charged and tested and is ready for final connections.
The centrifugal fan condensing unit includes scroll compressor, condenser coil, centrifugal blower assembly, high-pressure switch, Lee-Temp head pressure control.
Condensing unit has hot gas bypass standard feature which bypasses hot gas around the compressor directly to the suction side of the compressor to provide capacity control and reduce compressor cycling.
System includes liquid injection valve to maintain proper suction superheat.
Unit must be mounted indoors. Duct flanges are provided.
The air cooled condensing unit can be mounted on the roof or a ground level site. The condensing unit housing is manufactured of galvanized steel with a powder coat finish. The copper-tube, aluminum-fin coil is equipped with low temperature controls to assure year-round operation to -30°F (-34.4°C). The condensing unit is completely factory wired, charged and tested and is ready for final connections. (See illustration below)
The standard prop fan condensing unit includes scroll compressor, prop fan, high head pressure switch, hot gas bypass and Lee-temp head pressure control (for operation down to -30°F (-39°C) ambient.)
This unit is available in these optional configurations:
• 105°F (40°C) ambient for high ambient conditions.
• 95°F (35°C) ambient Quiet-Line for low noise level conditions below 58 dBa.
Factory installed non-fused disconnect switch allows unit to be turned off for maintenance. Disconnect switch is available on indoor condensing units only.
(3 ton only): Consists of one pre-charged liquid line and one pre-charged insulated suction line of soft copper tubing. Each line has one male quick-connect coupling and one female quick-connect coupling with an access valve connection.
Available in 15 ft. (4.6m) and 30 ft. (9.1m) lengths for interconnection of remote located condenser module.
Maximum recommended distance between evaporator and condenser modules with pre-charged line sets is 45 ft. (13.7m). For longer runs, use sweat adapter kit.
(3 ton only): Contains two suction and two liquid line compatible fittings that allow field-supplied interconnecting refrigerant lines to be used.
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A co-axial condenser provides ample capacity to handle the heat rejection needs of the system while using a minimum of liquid and low total pressure drop.
Head pressure operated regulating valves accurately control the condensing temperature and maintain system capacity for various entering liquid flow rates and temperatures. Two-way valves with bypass are standard.
Three-way valves provide accurate control of condensing temperature and thus maintain constant system capacity while also keeping the condenser water flow rate constant.
The high pressure option for the condenser circuit consists of a regulating valve and a condenser rated at 350 psig (2413 kPa) water-pressure. This option is required in applications with large static head pressures.
A compressor crankcase heater is available to prevent the migration of refrigerant to the compressor during off cycles.
The hot gas reheat assembly consists of a 3-way directional solenoid operated valve and a hot gas reclaim coil.
Factory charged and sealed, the water cooled condensing unit is ready to be installed quickly and easily. The counter-flow coaxial condenser with two-way or three-way regulating valve designed for 150 psi
(1034.3 kPa) is matched to the heat rejection requirements of the compressor for a variety of flow rates and fluid temperatures.
Condensing unit has a hot gas bypass standard feature that bypasses hot gas around the compressor directly to the suction side of the compressor to provide capacity control and reduce compressor cycling.
System includes liquid injection valve to maintain proper suction superheat.
The high pressure option for the condenser circuit consists of a 2-way or 3-way water regulating valve and condenser rated at 350 psig (2413 kPa) water pressure. This option is required in applications with large static heads.
Allows unit to be turned off for maintenance. Disconnect switch is available on indoor condensing units only.
Consists of one pre-charged liquid line and one precharged insulated suction line of soft copper tubing.
Each line has one male quick-connect coupling and one female quick-connect coupling with an access valve connection.
Available in 15 ft. (4.6m) and 30 ft. (9.1m) lengths for interconnection of remote located condenser module.
Maximum recommended distance between evaporator and condenser with pre-charged line sets is 45 ft.
(13.7m). For longer runs, use sweat adapter kit.
(3 ton only) - contains two suction and two liquid line compatible fittings that allow field-supplied interconnecting refrigerant lines to be used.
The Liebert manufactured Fan Speed Control drycooler is constructed of aluminum and features copper tubes and aluminum fin design. It is low profile, propeller fan type and provides quiet, trouble free heat rejection. The drycooler features a variable speed fan motor and a specially engineered solid state fan speed transducer. The transducer senses the temperature of the leaving glycol and modulates the speed of the fan to maintain proper glycol temperatures. An integral, factory-wired and tested control panel reduces installation time.
The glycol system includes a matching centrifugal glycol pump. It is mounted in a vented, weatherproof enclosure.
Optional Equipment—See page 13.
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The Liebert GLYCOOL free-cooling system is integrated with a glycol cooled Challenger 3000.
At outdoor temperatures below 35°F (1.6°C), the
GLYCOOL coil is capable of providing total system capacity. At outdoor temperatures between 35° and
65°F (1.6° and 18.3°C), the unique modulating valve permits partial cooling of the space by the GLY-
COOL coil with the DX system picking up the rest of the load. Above 65°F (18.3°C) the unit functions as a glycol unit and all the cooling is accomplished by the
DX system. When cooling is required, the three-way modulating valve and water regulating valve direct glycol (from the heat rejection loop) to the
Econ-O-Coil located upstream of the evaporator coil, to the condenser, or to both.
The GLYCOOL system contains all the standard features of a glycol cooled system plus the following.
A solid-state temperature monitor compares the room air temperature and entering glycol temperature.
When air temperature is higher than glycol temperature, the monitor communicates to the microprocessor control that “free-cooling” is available.
The GLYCOOL coil is strategically located in the return air stream of the environmental control system.
This coil is designed for closed-loop applications using properly treated glycol solutions.
The air is first filtered before entering the coil and then is either precooled or totally cooled before entering the refrigeration coil. The glycol flow to the coil is controlled by a pre-piped modulating three-way valve. When supplied with a 45°F (7.2°C) glycol solution, the coil is sufficiently sized to offer the identical cooling capacity as is obtained during the refrigeration cycle of the compressor.
The GLYCOOL Three-Way Control Valve opens full anytime the temperature of the glycol solution is below room temperature, to take full advantage of all possible free cooling. As the outdoor ambient drops, the three-way control valve modulates the flow to the
GLYCOOL coil. It maintains constant temperature in the room and includes operating linkage and electronic motor. Unlike other valves of this nature, there is no over travel linkage or end switches to be adjusted.
A head pressure operated glycol regulating valve accurately controls the condensing temperature and system capacity for various entering glycol temperatures. The valve has three-way action.
The Liebert manufactured drycooler is constructed of aluminum with a copper tube aluminum fin coil. The low profile design features multiple direct drive propeller type fans, balanced to the heat rejection load.
An integral, factory wired and tested control panel reduces installation time.
For high pressure applications, the GLYCOOL system can be equipped with components rated at 300 psig (2069 kPa).
The dual pump package features two full size glycol pumps, each capable of providing sufficient flow for system operation. A flow switch will sense the loss of flow, should the lead pump fail, and automatically command the standby pump to start. The complete system includes dual pump housing, pumps, lead-lag switch and flow switch (for field installation). The dual pump package provides redundancy, protecting against costly downtime in the computer room.
Quiet-Line Drycoolers can help your facility meet the strictest noise codes, and do so at less cost than traditional drycoolers with acoustical shielding.
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The condensate pump, mounted in the bottom of most units, is used for condensate water only.
Complete with sump, motor and pump assembly and automatic control.
Standard model has single float.
A dual float condensate pump which includes connections to unit, common alarm, unit shutdown and one customer N/O contact is also available.
Clean, pure steam is generated in a disposable canister that is complete with supply and drain valves, electronic controls and steam distributor. The humidifier is provided with an automatic flush cycle to lengthen service life. An indicator on the Challenger 3000 monitor panel is activated when the canister should be changed.
The remote temperature/ humidity sensors permit monitoring room conditions from an external source.
They are encased in an attractive case and are provided with a plug compatible shielded cable in virtually any length.
The disconnect operating handle protrudes through the front of the system for easy access.
Meets NEC codes.
The locking disconnect switch, mounted in the electrical panel, is connected to the safety lock dead front panel of the system and is inter-
locked mechanically. In this way the panel can’t be opened until the switch is in the off position. And it complies with local codes as well as those of the NEC.
Available in heights from 9" to 24" (228.6 to
609.6mm) in 3" (76.2mm) increments, adjustable +1-
1/2" (38.1mm). Allows for installation and connection of the Challenger 3000 prior to installation of the raised floor. A modular, field-installed turning vane can be added to the floor stand.
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NOTE
Some options or combinations of options may result in reduced air flow. Consult factory for recommendations.
This reheat uses stainless steel elements and also includes the necessary sensors and controls to provide variable heat output to help maintain tighter control of room conditions, especially in lightly loaded applications. (Contact factory for available voltages.) Direct expansion units only.
Four optional filters are available in lieu of standard package. A 4" (102mm) 20%, 30%, 40%-45% or
60%-65% filter may be specified. (Efficiency based on
ASHRAE 52.1). 2" (51mm) 20% pre-filters may also be specified.
These 16 ga. panels include heavy duty gaskets to provide satisfactory system operation when located outside the conditioned space in less-than desirable environments.
These blower/motor packages are available on upflow models where external static pressures are up to
2.0 inches (500 Pa) on 60 Hz units, and up to
1.5 inches (370 Pa) on 50 Hz units. These blowers are rigidly mounted for ducting directly to the blower housing.
(Consult the factory for specific applications.)
These motors replace the standard efficiency motors to provide increased energy savings during operation
(consult factory for specific efficiencies).
Standard height of 18" (457mm) with top duct connection or 2-way, 3-way or 4-way grille discharge styles available.
The smoke detector senses the return air, shuts down the unit upon detection, and sends visual and audible alarm. Dry contacts are available for a remote customer alarm. This smoke detector is not intended to function as or replace any room smoke detection system that may be required by local or national codes.
Supervised smoke detectors are also available as an option. Consult factory.
The firestat senses return air temperature of the system. Upon sensing high temperatures, the environmental control system is shut down. Required by codes in certain areas.
Controlled by a 2-way solenoid valve from the microprocessor control panel, these economical reheats have the capacity to maintain dry bulb conditions when the system is calling for dehumidification. The system is completely pre-piped and includes a control valve and Y-strainer. The reheat coil is constructed of copper tubes and aluminum fins.
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You will find a full range of monitoring and control systems, communications modules designed to interface Liebert equipment with a variety of building management systems, plus stand-alone monitoring, control and leak detection devices.
SiteScan Web is a comprehensive critical systems monitoring solution dedicated to ensuring reliability through graphics, event management and data extrapolation. The standard Web interface allows users easy access from anywhere at anytime.
• Single- and multi-site applications.
• Event management and unit control.
• Trend and historical data captures and reporting.
• Full ASHRAE BACnet compatibility.
• Java based.
• Windows 2000 and XP compatible.
SiteLink
• Connectivity to building management systems using Modbus and BACnet.
Site I/O
• Integrates sensors and contacts.
OpenComms Nform
• Centralized monitoring of all Liebert SNMP enabled devices.
• Event and alarm management.
• Adaptable and configurable graphical user interface.
• Integration of third-party SNMP enabled devices through custom Liebert services.
• Windows NT, 2000 and XP compatible.
Autonomous microprocessor controlled modules are available to provide supervision, control and remote notification of Liebert equipment. These stand-alone devices include:
Contact Closure Alarm Panels
• Continuously monitor critical support equipment and instantly notify on alarm condition.
Site TPI
• Integrates non-Liebert equipment.
The OpenComms™ family of products leverages oneto-one unit connections and your existing network for a comprehensive monitoring solution for distributed equipment.
OpenComms NIC
• Monitoring option available for Liebert precision air conditioning units.
• Web interface for viewing and control.
• Modbus interface for building management systems.
• SNMP interface for network management systems.
Autochangeover Control Panels
• Sequence the operation of multiple environmental units.
Leak Detection Modules
• Provide quick detection and location of hazardous fluid leaks.
Discrete Output Interface Card
• Straightforward way to tie environmental units to a building management system or alarm panel.
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SiteScan Web is a monitoring solution for critical environments that utilize a facility-view approach.
The system enables communications from Liebert environmental and power units—as well as many other pieces of analog or digital equipment to a front end software package that provides monitoring, control and alarm management.
SiteScan monitoring gives you decision making power to effectively manage the equipment that is critical to your business. Designed with flexibility for large, complex systems as well as smaller, single-site facilities, the Liebert SiteScan line of products can provide real-time status and alarms.
The microprocessor-based module provides two-way communication between an existing building management system and up to 12 Liebert units via MOD-
Bus or BACnet.
OpenComms Nform centralizes the management of your distributed Liebert network equipment. Open-
Comms Nform software solution combines full-scale monitoring with the use of the existing network infrastructure—so the cost of dedicated, out-of-band communications cabling is eliminated. It is both scalable and adaptable so it can grow as your systems expand and needs change. OpenComms Nform will monitor any Liebert SNMP device that supports a network interface, such as the OpenComms Web
Card and the OpenComms Network Interface Card.
Authenticated alarm management and event notification ensures that alarms are detected and acted upon, which allows problems to be quickly resolved.
The OpenComms Network Interface Card (OC-NIC) and OpenComms Web Card (OC-Web Card) provide
Ethernet connectivity for Liebert equipment. Operating status and alarms are communicated via the network to external systems utilizing industry standard open protocols.
The Environmental Discrete Outputs Card
(ENV-DO) provides 16 discrete outputs, corresponding to status and major alarm conditions. These
Form-C contact closures provide a straightforward means to connect Liebert Environmental units to
Building Management Systems (BMS), I/O or alarm panels.
LEDs display customized alarm indication for any dry contact input including alarms for Liebert environmental, power and UPS systems. The RCM4 monitors and displays four dry contact points.
Up to eight environmental units can be automatically and centrally controlled for emergency switching and to balance unit runtime. The AC3 controls two or three units. The RAC2-8 controls two through eight units and has the ability to provide alarm notification to pagers.
The Universal Monitor keeps personnel on-site and at remote locations apprised of the status of equipment through local alarming and remote paging services. The
panel will interface with anything that closes an electrical contact and any device with a 4-20mA signal. To improve process efficiency and troubleshooting, the panel tracks data in an alarm log, an event log and a trend log. The Universal Monitor has a local LCD interface and a remote dial-up interface.
Zone detectors with cable or single point detectors provide fast and accurate indication of water in you critical space.
These systems communicate with your
unit or with a separate monitoring system. Area water detection cable with distance measurement and monitoring protects your entire room. This system quickly and accurately calculates and displays the location of water on the cable, allowing you to promptly fin and correct a leak.
A seven-day temperature and humidity recorder permits close examination of computer room environment condition and can be used as a permanent record of the environmental control system’s operation efficiency.
The system includes pens, 100 recording charts; two bottles of recording ink (1 red ink and 1 blue ink).
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These specifications describe requirements for an environmental control system. The system shall be designed to maintain temperature and relative humidity conditions within the room. The manufacturer shall design and furnish all equipment to be fully compatible with heat dissipation requirements of the site.
The environmental control system shall be a Liebert
Challenger 3000 factory assembled unit. Standard 60
Hz units shall be UL listed and CSA (NRTL-C) certified. It shall be specifically designed for service from the front of the unit. The system shall be designed for draw-through air arrangement to insure even air distribution to the entire face area of the coil.
Each system shall be capable of handling ____ CFM
(CMH) at ____inches (mm) of water external static pressure with (down discharge air flow) (up discharge air flow with front return or up discharge airflow with rear return) pattern. It shall have a total cooling capacity of ____ BTU/HR (kW), sensible cooling capacity of ____ BTU/HR (kW), based on the entering air condition of °F (°C) dry bulb, and ____ °F
(°C) wet bulb. These units are to be supplied with
____ Volt, ____ phase, ____ Hz power supply. The humidifier shall have a capacity of ____ lbs/hr (kg/h).
Reheat shall have a capacity of _____ BTU/HR (kW).
The main fan shall be ____ HP (kW).
Submittals shall be provided with the proposal and shall include: Single-Line Diagrams; Dimensional,
Electrical, and Capacity data; Piping and Electrical
Connection Drawings.
The frame shall be constructed of MIG welded tubular and formed steel. All frame components shall be finished in a black, powder-coat finish to protect against corrosion. The exterior panels shall be
(20 gauge)/(18 gauge) steel and shall be powder coated with ____ color paint. The panels shall be insulated with a minimum 1 in. (25.4mm), 1-1/2 lbs.
(0.68 kg) density fiber insulation. Front and side panels shall have captive, 1/4 turn fasteners.
The cabinet shall be designed so that all components are serviceable and removable from the front of the unit.
The fan shall be the centrifugal type, double width, double inlet. The shaft shall be heavy duty steel with self-aligning ball bearings with minimum life span of
100,000 hours.
The fan motor shall be 1750 RPM and mounted on an adjustable base. The drive package shall be sized for
200% of the fan motor horsepower, and equipped with an adjustable motor pulley. The fan/motor assembly shall be mounted on (vibration isolators)
(solid base). The fan shall be located to draw air over the coil to ensure even air distribution and maximum coil performance.
High Efficiency Motor (Optional)
The fan motor shall be a ____ HP (kW) high efficiency motor with a full load efficiency of ____ %.
The filter shall be____ inches (mm) thick and rated not less than _____ % (20%, 30%, 40-45%, 60-65%) efficiency based on ASHRAE 52.1.
Prefilter (Optional)
The prefilter shall be 2 in. (50.8mm) thick with an efficiency of 20% based on ASHRAE 52.1.
The Advanced control processor shall be microprocessor based with a front monitor LCD display panel and control keys for user inputs. The controls shall be menu driven with on-screen prompts for easy user operation. The system shall allow user review and programming of temperature and humidity setpoints, alarm parameters, and setup selections including choice of control type. A password shall be required to make system changes. For all user selections, the range of acceptable input (temperature, humidity, or time delay) shall be displayed on the monitor screen. The system shall provide monitoring of room conditions, operational status in % of each function, component run times, date and time, and four analog inputs from sensors provided by others.
Control
The control system shall allow programming of the following room conditions:
Temperature Setpoint 65 to 85°F (18-29°C)
Temperature Sensitivity +1 to +9.9°F (0.6 to
5.6°C) in 0.1° increments
Humidity Setpoint 20 to 80% RH
Humidity Sensitivity +1 to +30% RH
All setpoints shall be adjustable from the individual unit front monitor panel. The microprocessor can be set within these ranges, however, the unit may not be able to control to extreme combinations of temperature and humidity.
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Temperature and Humidity Sensors shall be capable of being calibrated using the front monitor panel controls to coordinate with other temperature and humidity sensors in the room.
Predictive Humidity Control
The microprocessor shall calculate the moisture content in the room and prevent unnecessary humidification and dehumidification cycles by responding to changes in dew point temperature.
Compressor Short-Cycle Control
The control system shall include a program to prevent compressor short-cycling.
System Auto-Restart
For start-up after power failure, the system shall provide automatic restart with a programmable (up to 9.9 minutes in 6-second increments) time delay.
Programming can be performed either at the unit or from the central site monitoring system.
Sequential Load Activation
During start-up, or after power failure, the microprocessor shall sequence operational load activation to minimize inrush current. Systems allowing multiple loads to start simultaneously are unacceptable.
Chilled Water/Hot Water/Econ-O-Coil Flush
Cycles
Chilled water, hot water, and Econ-O-Cool coils (if unit is so equipped) shall be automatically flushed to prevent the buildup of contaminants. Systems without this feature shall include the necessary devices to bypass fluid into the coil on a programmed basis.
Front Monitor Display Panel
The microprocessor shall provide a front monitor
LCD backlit display panel with 4 rows of 20 characters with adjustable contrast. This display (along with five front mounted control keys) shall be the only operator interface required to obtain all available system information such as room conditions, operational status, alarms, control and alarm setpoints, and all user selections including alarm delays, sensor calibration, DIP switch selections, and diagnostics. All indicators shall be in language form.
No symbols or codes shall be acceptable.
Alarms
The microprocessor shall activate an audible and visual alarm in event of any of the following conditions:
High Temperature
Low Temperature
High Humidity
Low Humidity
Short Cycle
Compressor Overload (Optional)
Main Fan Overload (Optional)
Humidifier Problem
High Head Pressure
Change Filter
Loss of Air Flow
Low Suction Pressure
Loss of Power
Custom Alarm (#1 to #4)
Custom alarms are four customer accessible alarm inputs to be indicated on the front panel. Custom alarms can be identified with prepared (programmed) alarm labels for the following frequently used inputs:
Water Under Floor
Smoke Detected
Standby GC Pump On
Loss of Water Flow
Standby Unit On
User customized text can be entered for two of the four custom alarms. Each alarm (unit and custom) can be separately enabled or disabled, selected to activate the common alarm, and programmed for a time delay of 0 to 255 seconds.
Audible Alarm
The audible alarm shall annunciate any alarm that is enabled by the operator.
Common Alarm
A programmable common alarm shall be provided to interface user selected alarms with a remote alarm device.
Remote Monitoring
All alarms shall be communicated to the Liebert monitoring system with the following information: date and time of occurrence, unit number, and present temperature and humidity.
Analog Inputs
The system shall include four customer accessible analog inputs for sensors provided by others. The analog inputs shall accept a 4 to 20 mA signal. The user shall be able to change the input to 0 to 5 VDC or 0 to 10 VDC if desired. The gains for each analog input shall be programmable from the front panel.
The analog inputs shall be able to be monitored from the front panel.
Diagnostics
The control system and electronic circuitry shall be provided with self-diagnostics to aid in troubleshooting. The microcontroller board shall be diagnosed and reported as pass/not pass. Control inputs shall be indicated as on or off at the front monitor panel.
Control outputs shall be able to be turned on or off from the front monitor panel without using jumpers or a service terminal. Each control output shall be indicated by an LED on a circuit board.
Data Collection
The control system shall maintain accumulative operating hours of compressor, reheat, humidifier, fan motor, and Econ-O-Coil. The ten most recent alarms shall also be retained.
Communications
The microprocessor shall be compatible with all Liebert remote monitoring and control devices.
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The optional Advanced control processor shall be microprocessor based with a front monitor dot matrix display panel and control keys for user inputs. The controls shall be menu driven with on-screen prompts for easy user operation. The system shall allow user review and programming of temperature and humidity setpoints, alarm parameters, and setup selections including choice of control type. A password shall be required to make system changes.
For all user selections, the range of acceptable input
(temperature, humidity, or time delay) shall be displayed on the monitor screen. The system shall provide monitoring of room conditions, operational status in % of each function, component run times, date and time, and four analog inputs from sensors provided by others.
Control
The control system shall allow programming of the following room conditions:
Temperature Setpoint 65 to 85°F (18-29°C)
Temperature Sensitivity +1 to +9.9°F (0.6 to
5.6°C) in 0.1° increments
Humidity Setpoint 20 to 80% RH
Humidity Sensitivity +1 to +30% RH
All setpoints shall be adjustable from the individual unit front monitor panel.
Temperature and Humidity Sensors shall be capable of being calibrated using the front monitor panel controls to coordinate with other temperature and humidity sensors in the room.
Predictive Humidity Control
The microprocessor shall calculate the moisture content in the room and prevent unnecessary humidification and dehumidification cycles by responding to changes in dew point temperature.
Compressor Short-Cycle Control
The control system shall include a program to prevent compressor short-cycling.
System Auto-Restart
For start-up after power failure, the system shall provide automatic restart with a programmable (up to 9.9 minutes in 6-second increments) time delay.
Programming can be performed either at the unit or from the central site monitoring system.
Sequential Load Activation
During start-up, or after power failure, the microprocessor shall sequence operational load activation to minimize inrush current. Systems allowing multiple loads to start simultaneously are unacceptable.
Chilled Water/Hot Water/Econ-O-Coil Flush
Cycles
Chilled water, hot water, and Econ-O-Cool coils shall be automatically flushed to prevent the buildup of contaminants. Systems without this feature shall include the necessary devices to bypass fluid into the coil on a programmed basis.
Front Monitor Display Panel
The microprocessor shall provide a front monitor 240 x 120 dot matrix display panel with adjustable backlighting. This display (along with five front mounted control keys) shall be the only operator interface required to obtain all available system information such as room conditions, operational status, graphical data, alarms, control and alarm setpoints, and all user selections including alarm delays, sensor calibration, DIP switch selections, and diagnostics. All indicators shall be in language form. No symbols or codes shall be acceptable.
Alarms
The microprocessor shall activate an audible and visual alarm in event of any of the following conditions:
High Temperature
Low Temperature
High Humidity
Low Humidity
Short Cycle
Compressor Overload (Optional)
Main Fan Overload (Optional)
Humidifier Problem
High Head Pressure
Change Filter
Loss of Air Flow
Low Suction Pressure
Loss of Power
Custom Alarm (#1 to #4)
Custom alarms are four customer accessible alarm inputs to be indicated on the front panel. Custom alarms can be identified with prepared (programmed) alarm labels for the following frequently used inputs:
Water Under Floor
Smoke Detected
Standby GC Pump On
Loss of Water Flow
Standby Unit On
User-customized text can be entered for all four custom alarms. Each alarm (unit and custom) can be separately enabled or disabled, selected to activate the common alarm, and programmed for a time delay of 0 to 255 seconds.
Audible Alarm
The audible alarm shall annunciate any alarm that is enabled by the operator.
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Common Alarm
A programmable common alarm shall be provided to interface user selected alarms with a remote alarm device.
Remote Monitoring
All alarms shall be communicated to the Liebert site monitoring system with the following information: date and time of occurrence, unit number, and present temperature and humidity.
Analog Inputs
The system shall include four customer accessible analog inputs for sensors provided by others. The analog inputs shall accept a 4 to 20 mA signal. The user shall be able to change the input to 0 to 5 VDC or 0 to 10 VDC if desired. The gains for each analog input shall be programmable from the front panel.
The analog inputs shall be able to be monitored from the front panel.
Diagnostics
The control system and electronic circuitry shall be provided with self-diagnostics to aid in troubleshooting. The microcontroller board shall be diagnosed and reported as pass/not pass. Control inputs shall be indicated as on or off at the front monitor panel.
Control outputs shall be able to be turned on or off from the front monitor panel without using jumpers or a service terminal. Each control output shall be indicated by an LED on a circuit board.
Data Collection
The control system shall maintain accumulative operating hours of compressor, reheat, humidifier, fan motor, Econ-O-Coil, and heat rejection. The sixty most recent alarms shall also be retained.
Graphing
The control shall display the following graphical data:
Temperature, humidity, analog inputs
Component operating status by hour
Operating status
Communications
The microprocessor shall be compatible with all Liebert remote monitoring and control devices.
The humidifier shall be of the infrared type consisting of high intensity quartz lamps mounted above and out of the water supply. The evaporator pan shall be stainless steel and arranged to be serviceable without disconnecting water supply lines, drain lines or electrical connections. The complete humidifier section shall be pre-piped ready for final connection. The infrared humidification system shall use bypass air to prevent over-humidification of the controlled space. The auto flush system shall automatically flush deposits from the humidifier pan. The system shall be field adjustable to change the cycle time to suit local water conditions. The humidifier shall have a capacity of _____ lbs/hr (kg/h).
The environmental control system shall be equipped with a steam generating humidifier that is controlled by the microprocessor control system. It shall be complete with disposable canister, all supply and drain valves, steam distributor, and electronic controls. The need to change canister shall be annunciated on the microprocessor control panel. The humidifier shall have a capacity of ____ lbs/hr (kg/h).
The low-watt density, 304/304, stainless steel, finned-tubular electric reheat coils shall be capable of maintaining room dry bulb conditions when the system is calling for dehumidification. The reheat section shall include UL approved safety switches to protect the system from overheating. The capacity of the reheat coils shall be ____ BTU/HR (kW), ____ kW, controlled in ____ stage(s).
The hot water reheat coil shall have copper tubes and aluminum fins with a capacity of _____ BTU/HR
(kW) when supplied with _____ °F (°C) entering water temperature at _____GPM (l/s) flow rate. Maximum pressure drop shall be _____ PSI (kPa). The control system shall be factory pre-piped with a
2-way motorized control valve and cleanable
Y-strainer.
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 controller provides precise temperature control, and the more constant element temperature improves heater life. The capacity of the reheat coils shall be _____
BTU/HR (kW).
The floor stand shall be constructed of a heliarcwelded tubular steel frame. The floor stand shall be coated using an autodeposition process to protect against corrosion. The floor stand shall have adjustable legs with vibration isolation pads. The floor stand shall be: 9 in. (23cm), 12 in. (30cm), 15 in. (38cm), 18 in. (46cm), 21 in. (53cm), 24 in. (61cm) high.
The turning vane shall be designed to mount in the factory supplied floor stand and direct air either to the front or rear of the unit.
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The unit shall be supplied with a (2 way) (3 way) (4 way) (ducted) air discharge plenum. The plenum shall be 18 in. (457mm) high, insulated and powder painted the same color as the room unit.
The manual disconnect switch shall be mounted in the high voltage section of the electrical panel. The switch shall be accessible with the door closed.
The manual disconnect switch shall be mounted in the high voltage section of the electrical panel. The switch shall be accessible from the outside of the unit with the door closed, and prevent access to the high voltage electrical components until switched to the
“OFF” position.
The unit shall be supplied with remote temperature and humidity sensors. The sensors shall be connected to the unit by a 30 ft. (9m), 60 ft. (18m), 90 ft.
(27m), 120 ft. (36m), 150 ft. (45m) shielded cable.
The firestat shall immediately shut down the system when high temperatures are detected. The firestat shall be mounted in the electrical panel with the sensing element in the return air.
The smoke detector senses the return air, shuts down the unit upon detection, and sends visual and audible alarm. Dry contacts are available for a remote customer alarm. This smoke detector is not intended to function as or replace any room smoke detection system that may be required by local or national codes.
The condensate pump shall have the capacity of ____
GPH (l/h) at ____ ft. (m) head @ ____ V - ____ Hz. It shall be complete with (single) (dual) integral float switch, pump, motor assembly, and reservoir.
Direct Expansion Coil
The evaporator coil shall have _____ sq.ft. (sq. m) face area, _____ rows deep. It shall be configured as (A)
(V) frame and be constructed of copper tubes and aluminum fins and have a maximum face velocity of
_____ ft. per minute (m/s) at _____ CFM (CMH). The coil shall be provided with a stainless steel drain pan.
Refrigeration System
The refrigeration system shall consist of a high efficiency scroll compressor, hot gas bypass, pressure safety switches, externally equalized expansion valve, filter drier, refrigerant sight glass and moisture indicator.
Pump Down Control
A liquid line solenoid valve shall be provided for pump down control.
Crankcase Heater
A crankcase heater shall be provided for additional system protection from refrigerant migration during off cycles.
Propeller Fan Condenser (Standard)
The Liebert manufactured air cooled condenser shall be the low profile, slow speed, direct-drive, propellerfan type. The condenser shall be constructed of aluminum and contain a copper tube, aluminum fin coil with an integral electric control panel. The system shall be designed for _____ °F (°C) ambient. The air cooled condenser shall have a _____ Volt, _____ phase,
____ Hz power supply.
Fan Speed Control (FSC) Head Pressure Control (Standard)
The winter control system for the air cooled condenser shall be Liebert Fan Speed Control (FSC).
The variable speed motor shall turn on at 10% of the supply voltage and modulate in response to head pressure to a full speed of 1050 RPM. It shall be designed with ball bearings, permanent lubrication, and internal overload protection.
The control system shall be complete with transducers, thermostats and electrical control circuit, factory prewired and tested in an integral control panel. The transducer shall automatically sense the head pressure of the compressor and control the variable speed fan on the air cooled condenser to properly maintain the head pressure.
The fan speed control system shall provide positive start-up and operation in ambient temperature as low as -20°F (-29°C). Included with the fan speed control system shall be a solid state winter start kit as an integral feature of the electronic control panel.
Lee-Temp Head Pressure Control (Optional)
The winter control system for the air cooled condenser shall be “Lee-Temp.” The Lee-Temp system shall allow startup and positive head pressure control with ambient temperatures as low as -30°F
(-34.4°C). The Lee-Temp package shall include: insulated receiver, pressure relief valve for each circuit, head pressure three-way control valve, and rotalock valve for isolating the refrigerant charge. The Lee-
Temp receiver shall be factory insulated and mounted ready for the field connection to the air cooled condenser. The Lee-Temp heater shall be (150)
(300) _____ Watt and require a separate power supply of (115) (230) _____ Volt, single phase, _____ Hz.
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Piggyback Condenser (Optional)
The system shall be supplied with a piggyback condenser (PB). The condenser shall be constructed of steel with frame coated using the autophoretic ® process, and panels powder coated to protect against corrosion. The coil shall be copper tube with aluminum fins. The heavy duty fan shall be the centrifugal type, double width, double inlet. The 1750 RPM
(1450 RPM @ 50 Hz) fan motor shall be mounted on an adjustable base, and equipped with an adjustable motor pulley. A Liebert Lee-Temp head pressure control system shall be integral with the unit. The system shall be designed for -30°F (-34.4°C) ambient.
The air cooled condenser shall have a _____ Volt,
3 phase, _____ Hz power supply.
Centrifugal Fan Condenser (Optional)
The system shall be supplied with a centrifugal fan condenser (LCC). The condenser shall be constructed of galvanized steel with a copper tube, aluminum fin coil. The heavy duty fan shall be the centrifugal type, double width, double inlet. The 1750 RPM (1450
RPM @ 50 Hz) fan motor shall be mounted on an adjustable base, and equipped with an adjustable motor pulley. A Liebert Lee- Temp head pressure control system shall be field piped to the unit. Electrical controls shall be in a rain-tight enclosure.
The system shall be designed for _____ °F (°C) ambient. The air cooled condenser shall have a _____ Volt,
3 phase, _____ Hz power supply.
The water/glycol system shall be equipped with a coaxial condenser having a total pressure drop of _____ ft. of water (kPa) and a flow rate of _____ GPM (l/s) with
_____ °F (°C) entering water/glycol temperature.
2-Way Water Regulating Valve with Bypass
(Standard)
The condenser circuit shall be pre-piped with a headpressure actuated 2-way regulating valve with bypass.
3-Way Water Regulating Valve (Optional)
The condenser circuit shall be pre-piped with a head pressure actuated 3-way regulating valve.
Design Pressure
The condenser water/glycol circuit shall be designed for a pressure of [(150 PSI (1034 kPa)) (350 PSI
(2413 kPa))].
Crankcase Heater (Optional)
A crankcase heater is provided to prevent the migration of refrigerant to the compressor during off cycles.
Hot Gas Reheat (Optional)
The complete hot gas reheat system shall include a copper tube, aluminum fin coil, three-way solenoid valve, and refrigerant check valve. The capacity of the coil shall be _____ BTU/HR (kW).
Propeller Fan Drycooler (Standard)
The Liebert manufactured drycooler shall be the low profile, slow speed, direct drive propeller fan type.
The drycooler shall be constructed of aluminum and contain a copper tube aluminum fin coil with an integral electric control panel. The drycooler shall be designed for _____ °F (°C) ambient.
Centrifugal Fan Drycooler (Optional)
The system shall be supplied with a centrifugal fan drycooler (LCD). The drycooler shall be constructed of galvanized steel with a copper tube, aluminum fin coil.
The heavy duty fan shall be the centrifugal type, double width, double inlet. The 1750 RPM (1450 RPM @
50 Hz) fan motor shall be mounted on an adjustable base, and equipped with an adjustable motor pulley. A
3-way control valve and thermostat shall maintain the desired fluid temperature. Electrical controls shall be in a rain-tight enclosure. The system shall be designed for _____ °F (°C) ambient. The drycooler shall have a
_____ Volt, 3 phase, _____ Hz power supply.
Single Glycol Pump Package (Standard)
This system shall be provided with a centrifugal pump mounted in a weatherproof and vented enclosure. The pump shall be rated for _____ GPM (l/s) at
_____ ft. of head (kPa), and operate on _____ Volt,
3 phase, _____ Hz.
Dual Glycol Pump Package (Optional)
The dual pump package shall include pumps, enclosure, and field mounted flow switch. The pumps shall be wired to the drycooler control box which includes a lead/lag switch for the pumps. The standby pump shall automatically start upon failure of the lead pump. Each pump shall be rated _____ for
GPM (l/s) at _____ feet of head (kPa).
GLYCOOL Coil
The GLYCOOL coil shall be constructed of copper tubes and aluminum fins and be located upstream of the evaporator coil. The GLYCOOL coil shall be designed for closed-loop applications using properly treated glycol solutions. The coil shall be rated at
_____ BTU/HR (kW) sensible cooling capacity with a
45°F (7.2°C) entering glycol solution temperature.
The GLYCOOL coil shall require _____ GPM (l/s) and the total unit pressure drop shall not exceed _____ feet of water (kPa) when in the free cooling mode.
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3-Way GLYCOOL Valve
The GLYCOOL coil shall be equipped with a fully proportional 3-way control valve. This motorized control valve shall control the amount of flow to the
GLYCOOL coil and maintain constant temperature and relative humidity.
Glycol Condenser
The glycol system shall be equipped with a coaxial condenser having a total pressure drop of _____ feet of water (kPa) and a flow rate of _____ GPM (l/s), with _____ °F (°C) entering 40% ethylene glycol temperature.
3-Way Water Regulating Valve
The condenser circuit shall be pre-piped with a head pressure actuated 3-way water regulating valve.
Design Pressure
The GLYCOOL coil/condenser circuit shall be designed for a pressure of [(150 PSI (1034 kPa)) (300
PSI (2069 kPa))].
Comparator Circuit
The system shall be equipped with a microprocessorcontrolled comparator sensor that permits free-cooling operation whenever entering glycol temperature is below return-air temperature.
Propeller Fan Drycooler (Standard)
The Liebert manufactured drycooler shall be the low profile, slow speed, direct drive propeller fan type.
The drycooler shall be constructed of aluminum and contain a copper tube aluminum fin coil with an integral electric control panel. The drycooler shall be designed for _____ °F (°C) ambient.
Centrifugal Fan Drycooler (Optional)
The system shall be supplied with a centrifugal fan drycooler (LCD). The drycooler shall be constructed of galvanized steel with a copper tube, aluminum fin coil.
The heavy duty fan shall be the centrifugal type, double width, double inlet. The 1750 RPM (1450 RPM @
50 Hz) fan motor shall be mounted on an adjustable base, and equipped with an adjustable motor pulley. A
3-way control valve and thermostat shall maintain the desired fluid temperature. Electrical controls shall be in a rain tight enclosure. The system shall be designed for _____ °F (°C) ambient. The drycooler shall have a
_____ Volt, 3 phase, _____ Hz power supply.
Single Glycol Pump Package (Standard)
This system shall be provided with a centrifugal pump mounted in a weatherproof and vented enclosure. The pump shall be rated for _____ GPM (l/s) at
_____ ft. of head (kPa), and operate on _____ Volt,
3 phase, _____ Hz.
Dual Glycol Pump Package (Optional)
The dual pump package shall include pumps, enclosure, and field mounted flow switch. The pumps shall be wired to the drycooler control box which includes a lead/lag switch for the pumps. The standby pump shall automatically start upon failure of the lead pump. Each pump shall be rated for _____ GPM (l/s) at _____ feet of head (kPa).
Direct Expansion Coil
The evaporator coil shall have _____ sq.ft. (sq. m) face area, _____ rows deep. It shall be configured as
(A) (V) frame and be constructed of copper tubes and aluminum fins and have a maximum face velocity of
_____ ft. per minute (m/s) at _____ CFM (CMH). The coil shall be provided with a stainless steel drain pan.
Refrigeration System
The refrigeration system shall consist of a rugged scroll compressor, pressure safety switches, externally equalized expansion valve, filter dryer, and a refrigerant sight glass and moisture indicator.
Refrigerant Line Sets (Optional)
Pre-charged refrigerant line sets shall be provided by
Liebert in proper lengths for application. Line set length shall be _____ feet (m).
The condenser coil shall be constructed of copper tubes and aluminum fins. The condensing unit shall be factory assembled, charged with refrigerant and sealed.
Components shall include scroll compressor, highpressure switch, Lee-temp refrigerant receiver, head pressure control valve, and liquid line solenoid valve.
The condensing unit shall be designed for 95°F
(35°C) ambient and be capable of operation to -20°F
(-29°C) ambient.
A hot gas bypass circuit shall be provided to reduce compressor cycling and improve operation under low load conditions.
The condenser fan shall be designed for
_____ CFM (CMH) at _____ inches (mm) external static pressure.
(Optional) Disconnect
Factory installed non-fused disconnect switch allows unit to be turned off for maintenance.
3-Ton Models
The condensing module shall be capable of being connected to the evaporator section using pre-charged refrigerant line sets. No brazing, dehydration, or charging shall be required. The fan/motor assembly shall be direct drive.
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5-Ton Models
The fan/motor assembly shall be belt drive. Condensing unit must be hard piped with the evaporator.
Sweat adapters are shipped loose with all 5 ton evaporators for use on the 5 ton condensing units.
The condenser coil shall be constructed of copper tubes and aluminum fins with a direct drive propeller type fan and shall include a scroll compressor, high pressure switch, Lee-temp receiver, head pressure control valve, and liquid line solenoid valve. All components shall be factory assembled, charged with refrigerant and sealed. No brazing, dehydration, or charging shall be required. Condensing unit shall be designed for 95°F (35°C) ambient and be capable of operation to -30°F (-34.4°C).
A hot gas bypass circuit shall be provided to reduce compressor cycling and improve operation under low load conditions.
(Optional) Quiet-Line Models
The condensing unit shall be designed to operate at a sound level less then 58 dBa.
(Optional) High Ambient Models
The outdoor condensing unit shall be designed for design ambient operation of 105°F (40.6°C).
3-Ton Models
The condensing module shall be capable of being connected to the evaporator section using pre-charged refrigerant line sets. No brazing, dehydration, or charging shall be required.
5-Ton Models
Condensing unit must be hard piped with the evaporator. Sweat adapters are shipped loose with all 5 ton evaporators for use on the 5 ton condensing units.
Water or Glycol Cooled Condensing Unit
The water/glycol condensing unit shall be equipped with a coaxial condenser having a total system pressure drop of _____ ft. of water (kPa) and a flow rate of
_____ GPM (l/s) with _____ °F (°C) entering water/ glycol temperature.
Components shall include scroll compressor and high-pressure switch. The condensing unit shall be factory charged with R-22 refrigerant.
The condenser circuit shall be pre-piped with a
[(2-way) (3-way)] regulating valve which is headpressure actuated.
The condenser water/glycol circuit shall be designed for a static operating pressure of [(150 PSI
(1034 kPa)) (350 PSI (2413 kPa))].
A hot gas bypass circuit shall be provided to reduce compressor cycling and improve operation under low load conditions.
(Optional) Disconnect
Factory installed non-fused disconnect switch allows unit to be turned off for maintenance.
3-Ton Models
The condensing module shall be capable of being connected to the evaporator section using pre-charged refrigerant line sets. No piping, brazing, dehydration, or charging shall be required.
5-Ton Models
Condensing unit must be hard piped with the evaporator. Sweat adapters are shipped loose with all
5 ton evaporators for use on the 5 ton condensing units.
Propeller Fan Drycooler (Standard)
The Liebert manufactured drycooler shall be the low profile, slow speed, direct drive propeller fan type.
The drycooler shall be constructed of aluminum and contain a copper tube aluminum fin coil with an integral electric control panel. The drycooler shall be designed for _____ °F (°C) ambient.
Centrifugal Fan Drycooler (Optional)
The system shall be supplied with a centrifugal fan drycooler (LCD). The drycooler shall be constructed of galvanized steel with a copper tube, aluminum fin coil. The heavy duty fan shall be the centrifugal type, double width, double inlet. The 1750 RPM (1450 RPM
@ 50 Hz) fan motor shall be mounted on an adjustable base, and equipped with an adjustable motor pulley.
A 3- way control valve and thermostat shall maintain the desired fluid temperature. Electrical controls shall be in a rain tight enclosure. The system shall be designed for _____ °F (°C) ambient. The drycooler shall have a _____ Volt, 3 phase, _____ Hz power supply.
Single Glycol Pump Package (Standard)
This system shall be provided with a centrifugal pump mounted in a weatherproof and vented enclosure. The pump shall be rated for GPM (l/s) at
_____ ft. of head (kPa), and operate on _____ Volt,
3 phase, _____ Hz.
Dual Glycol Pump Package (Optional)
The dual pump package shall include pumps, enclosure, and field mounted flow switch. The pumps shall be wired to the drycooler control box which includes a lead/lag switch for the pumps. The standby pump shall automatically start upon failure of the lead pump. Each pump shall be rated for
_____ GPM (l/s) at _____ feet of head (kPa).
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The cooling coil shall have a minimum of _____ sq. ft.
(sq. m) face area, _____ rows deep. The coil shall be controlled by a modulating control valve. The chilled water coil shall be designed for closed-loop applications using properly maintained water. It shall be configured as an (A) (V) frame and be constructed of copper tubes and aluminum fins and have a maximum face velocity of _____ ft. per minute (m/s) at
_____ CFM (CMH). The water circuit shall be designed to distribute water into the entire coil face area. The coil shall be supplied with _____ °F (°C) entering water temperature, with a _____ °F (°C) temperature rise. The coil shall be supplied with
_____ GPM (m/s) of chilled water and the pressure drop shall not exceed _____ PSI (kPa). The coil assembly shall be mounted in a stainless steel condensate drain pan.
3-Way Chilled Water Valve (Standard)
The water circuit shall include a 3-way modulating valve. The microprocessor control shall position the valve in response to room conditions. Cooling capacity will be controlled by bypassing chilled water around the coil.
2-Way Chilled Water Valve (Optional)
The water circuit shall include a 2-way modulating valve. The microprocessor control shall position the valve in response to room conditions. The minimum close-off pressure of the valve/actuator assembly shall be _____ PSI (kPa).
Design Pressure
The chilled water circuit shall be designed for a pressure of [(150 PSI (1034 kPa)) (400 PSI (2758 kPa))].
Flow Switch (Optional)
The flow switch shall activate the alarm system should the chilled water supply be interrupted. The switch shall be factory mounted and wired.
(For detailed Guide Specifications on these products, refer to information posted at www.liebert.com)
SiteScan Web System
SiteLink Module
OpenComms Nform
OpenComms NIC & Web Card (OC-NIC &
OC-Web Card)
Environmental Discrete Outputs Card
(ENV-DO)
Remote Contact Monitor
• RCM4
Autochangeover Controllers
• AC3
• RAC2-8
Universal Monitor
Leak Detection
• Direct Read Module
• Zone Sensor
• Spot Sensor
Install environmental control units in accordance with manufacturer’s installation instructions. Install units plumb and level, firmly anchored in locations indicated, and maintain manufacturer’s recommended clearances.
Install and connect electrical devices furnished by manufacturer but not specified to be factory mounted.
Furnish copy of manufacturer’s electrical connection diagram submittal to electrical contractor.
Install and connect devices furnished by manufacturer but not specified to be factory mounted. Furnish copy of manufacturer’s piping connection diagram submittal to piping contractor.
Connect water supply and drains to air conditioning unit. Provide pitch and trap as manufacturer’s instructions and local codes require.
Start up environmental control units in accordance with manufacturer’s start up instructions. Test controls and demonstrate compliance with requirements.
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Ensuring The High Availability
0f Mission-Critical Data And Applications.
Emerson Network Power, the global leader in enabling business-critical continuity, ensures network resiliency and adaptability through a family of technologies—including Liebert power and cooling technologies—that protect and support business-critical systems.
Liebert solutions employ an adaptive architecture that responds to changes in criticality, density and capacity. Enterprises benefit from greater IT system availability, operational flexibility and reduced capital equipment and operating costs.
While every precaution has been taken to ensure the accuracy and completeness of this literature, Liebert Corporation assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions.
© 2006 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change without notice.
® Liebert and the Liebert logo are registered trademarks of Liebert
Corporation. All names referred to are trademarks or registered trademarks of their respective owners.
SL-11915 _REV1_08-06
Emerson Network Power.
The global leader in enabling Business-Critical Continuity ™ .
AC Power Systems Embedded Computing
Connectivity Embedded Power
DC Power Systems Integrated Cabinet Solutions
Technical Support / Service
Web Site www.liebert.com
Monitoring
800-222-5877 [email protected]
Outside the US: 614-841-6755
Single-Phase UPS
800-222-5877 [email protected]
Outside the US: 614-841-6755
Three-Phase UPS
800-543-2378 [email protected]
Environmental Systems
800-543-2778
Outside the United States
614-888-0246
Locations
United States
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P.O. Box 29186
Columbus, OH 43229
Europe
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Zona Industriale Tognana
35028 Piove Di Sacco (PD) Italy
+39 049 9719 111
Fax: +39 049 5841 257
Asia
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Hong Kong
852 2572220
Fax: 852 28029250
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Services
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Business-Critical Continuity, Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co.
©2006 Emerson Electric Co.
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