CONTENTS. Air-Cooled Screw Chiller Technical Sales Guide NOMENCLATURE FEATURES MODELS LIST

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2 CNTENT 2 NMENCLATURE 1 1.MDEL LIT 2.NMENCLATURE.FEATURE 4.PRDUCT DATA 6 5.PERFRMANCE CRRECTIN 8 6.ANTIFREEZE 9 7.INTALLATIN 9 8.ELECTRICAL DATA 11 9.ELECTRICAL DIAGRAM CHEMATIC WIRING DIAGRAM WIRE CNTRLLER MICRPRCER CNTRLLER 19 1.LNG-DITANCE MNITRING YTEM CENTRAL AC BM INTERFACE 2 15.APPLICATIN DATA 28 MDEL LIT Nominal Capacity Ton Refrigerant R14a Model Model Name LBLGF20MT/Nb-M LBLGF50MT/Nb-M LBLGF40MT/Nb-M Power upply Ph, V, Hz,80,50,80,50,80,50 2 L BLG F 20 T Water chiller crew compressor Air cooled Nominal Cooling Capacity uper high ambient operation 52 /125 L BLG F 20 M T /Nb-M Model ignification ptions 20=20kW= 784 kbtu/h 50=50kW= 1194 kbtu/h 40=40kW= 1467 kbtu/h M Modular Nb Refrigerant Nb-R14a M Voltage M 80V N~ 50Hz FEATURE.1 Description The kw models are shipped from the factory complete ready for installation and use. The unit is pressure-tested, evacuated, and fully charged with R14a and has an initial oil charge. R14a has no ozone depletion potential. It is environmentally safe and does not have a phase-out date. After assembly, a complete operation test is performed with water flowing through the cooler to assure that the refrigerating circuit operates correctly. The units can be installed on the rooftop, ground outside and so on, instead of being equipped in a special machine room. It can be widely applied in newbuilt or reconstructed industry and civil-building project, such as hotel, apartment,restaur-ant, office building, shopping mall, theater, gymnasium, hospital and so on, as well as supplies required cooling water for factories in technical process of producing, so it's especially suitable for some special locations around where there are high-level requirements for noise and environments and cooling tower are difficult to install..2 tandard pecifications High Efficiency Full Load peration Utilizing new screw compressor technology, the chillers meet or exceed the performance requirements of AHRAE All system components are selected for optimum performance, including the condenser coil areas and evaporator sizes. 2 GREE Central Air Conditioners GREE Central Air Conditioners

3 Excellent Part Load Performance By using compressor on each chiller, unloading characteristics and part load performance are outstanding. Integrated part load value (IPLV) is a part load performance indicator as outlined in tandard ARI 550/ The IPLV rating compares the performance of different chillers under identical conditions. When the IPLV is listed as EER (Energy Efficiency Ratio), a higher EER will indicate that the chiller's overall performance is better. Compact Design with mall Footprint The chillers have a reputation for a compact design and small footprint. A small footprint can save installation costs by minimizing the size of the concrete mounting pad or reduces the amount of structural steel if the unit is mounted on the rooftop. Quiet peration The chillers are designed with quiet screw compressors. Fans are selected for good performance and lower sound levels. The attention to detail with sound is critical in the design. mall issues such as refrigerant piping, supports for piping, securing components to the structure are all important to making a quiet product. We proudly publish our sound performance. uperior Controls GREE has provided the latest technology in controlling the chillers. The new controller provides a user friendly environment for the operator. The control logic is designed to provide maximum efficiency, to help provide continuing operation in unusual operating conditions through proactive controls, and to provide a history of conditions to aid in problem resolutions. Perhaps the greatest benefit is Protocol for integrating with your building automation system (BA). The interface with the BA standard protocols through Modbus. Evaporator The evaporator is direct expansion, shell-and-tube type with water flowing in the baffled shell side and refrigerant flowing through the tubes. The evaporator has a carbon steel fin and seamless high efficiency copper tubes roller expanded into a carbon steel tube sheet. Refrigerant heads are carbon steel with multi-pass baffles to provide oil return and are removable to permit access to the tubes from either end. For water removal, 10mm vent and drain plugs are provided on the top and bottom of the shell. An ambient air thermostat controls the heater cable. The fitted and glued in place insulation has a K factor of The refrigerant side maximum operating pressure is 2068 kpa. The water side operating pressure is 1048 kpa. Each evaporator is designed, constructed, inspected, and stamped according to the requirements of the AME Boiler and Pressure Vessel Code. Condenser Condenser coils have internally enhanced seamless copper tubes arranged in a staggered row pattern. The coils are mechanically expanded into louver aluminum fins with full fin collars. A variety of optional coil material and coatings are available for corrosive atmospheres. The external condenser coils are fitted with a protective wire mesh guard. everal optional coil materials are available for corrosive atmospheres. Fans-The condenser fans are composed of corrosion resistant aluminum hub and glass-fiberreinforced polypropylene composite blades molded into a low noise airfoil section. They are designed for maximum efficiency and are statically and dynamically balanced for vibration-free operation. They are directly driven by independent motors, and positioned for vertical air discharge. The fan guards are constructed of heavy-gauge, rust-resistant, coated steel. All blades are statically and dynamically balanced for vibration-free operation. Motors-The fan motors are totally enclosed air-over, squirrel-cage type, current protected. They feature ball bearings that are double-sealed and permanently lubricated. Microprocessor Controller The chiller's Unit Control Module is an innovative, modular microprocessor control design. It coordinates the actions of the chiller in an efficient manner and provides stand-alone operation of the unit. A Human Interface Panel is a standard component of the Chiller. Access to all unit controls is via the Human Interface Panel. Compressor uction gas cooled semi-hermetic compact twin screw compressors with high efficiency profile. Compressors are provided with high efficiency suction strainer, oil trainer crank case heater and built in safety pressure relief valve. Compressors are also provided with intelligent electronics including motor temperature monitoring, phase sequence monitoring, manual reset lockout and discharge temperature protection by PTC`s sensors. ptimized oil management ensure minimum refrigerant dilution in oil. Water Flow witch A water flow switch is available for field installation in the chilled water piping to protect against evaporator freeze-up under low, or no flow conditions. Terminals are provided in the unit control center for field connection of the water flow detection switch. A flow detection device of some type is required. Pump utput ignal Provides a digital output to control a second chilled water pump. tandard unit has one pump output. High Ambient peration This option is required for operation at ambient temperatures above 46, up to 52 or when the unit is equipped with the low ambient fan control option. The option can be ordered with any unit. Compressor loading and unloading is adaptively determined by system load, ambient air temperature and other inputs to the control algorithms. Construction The "W" shaped coil provides excellent headroom under the unit for inspection and service. It allows less installation space requirement. Heavy structure unit with waterproof, electro-static, polyester powder painted. 4 GREE Central Air Conditioners GREE Central Air Conditioners 5

4 4 The patented design of that any unitary module can be as master module, makes various emergencies easy. Each unitary module can be combined with another module with different capacity so that different units with different cooling capacity are formed in a wider application range. Balanced running of compressor extends the lifetime of unit. The compressor of each unitary module will be started one after another to ensure less attack to power network. The design of combination of modular makes the unit compact in size and configuration, convenient in delivery and installation.. tandard Accessories Unit on-off switch: N-FF switch is provided for manually switching the unit control circuit. Indicator lights: LED lights indicate power on to unit, running state and fault indications due to safety devices. Filter drier: Refrigerant circuits are kept free of moisture, sludge, acid and oil contamination by filter. Under voltage and phase protection: Protects against low incoming voltage as well as single phasing, phase reversal. ight glass: An easy-to-read color indicator shows moisture contents and provides a mean for checking the system refrigerant charge. Liquid line solenoid valve: Closes when the compressor is off to prevent any liquid refrigerant from accumulating in the evaporator..4 tandard Control & afety Devices afety valve: Protects the unit against high discharge pressure. Compressor In-built protection device: Motor winding temperature, discharge gas temperature and phase reversal for direction of rotation. Crankcase heaters: Protects the unit against refrigerant migration, oil dilution and potential compressor failure. PRDUCT DATA 4.1 Ratings Model LBLGF20MT/Nb-M LBLGF50MT/Nb-M LBLGF40MT/Nb-M Capacity kw / kbtu/h 20 / / / 1467 EER EER=Energy Efficiency Ratio at full load-the cooling capacity in Btu per hour(btu/h) divided by the power input in watts, expressed in Btu/h per watt((btu/h)/watt). 4.2 Unit Application Data Voltage Variation 80V N 50Hz 42/420 Min./Max. Ambient Air on Condenser coil Min./Max. ( ) 18/52 ( 65/125) 4. Physical Data Models Nominal Cooling Capacity Input Power Power upply Running Control afety Apparatus Compressor Type Refrigerant Charge Cooler Conde -nser Dimen -sion Refrigerant Type Water Flow Max. Pressure Water In/ut Pipe Diameter kw kbtu/h TR kw kg m /h Loss of Pressure kpa Heat Exchanger Heat Exchanger Fan Motor Power Input Height Width Depth hipping Weights peration Weights NTE: 1 mm=0.094 in MPa mm LBLGFMT /Nb-M V N~ 50Hz Microcomputer auto control, running status display, abnormal status alarm High/low pressure protection, discharge temp. protection,motor overload protection, anti-freeze, water flow protection, low water flow protection, phase-sequence protection, compressor overload protection, compressor inset protection,pressure differential protection emi-hermitic crew Compressor R14a GPM hell and Tube Evaporator 1.0 DN100 DN100 DN125 Finned Coil Type Condenser kw 2X4 2X6 2X8 mm mm mm kg kg GREE Central Air Conditioners GREE Central Air Conditioners 7

5 5 PERFRMANCE CRRECTIN Performance Correction 6 ANTIFREEZE Ethylene Glycol Factors Leaving Chilled Water ( ) 5(41) 6(42.8) 7(44.6) 8(46.4) 9(48.2) 10(50) 11(51.8) 12(5.6) 1(55.4) 14(57.2) 15(59) 25(77) (86) Ambient Temperature ( ) 5(95) 40(104) 45(11) (122) (11) The units can operate with a leaving chilled fluid temperature from of 20 to 60. A glycol solution is required when leaving chilled fluid temperature is below 4.5.The use of glycol will reduce the performance of the unit depending on concentration. % by Weight Freezing Point Ambient Temperature Cooling Capacity Correction Factor Water flow Correction Factor Pressure Drop Correction Factor 10 -.(26) 8.(47) (18) -1.7(29) (7) -6.7(20) (-7) -.(-29) -16.7(2) -26.7(-16) NTE: Ethylene and propylene glycol ratings are outside the scope of ARI tandard 550/ certification program. Cooling Capacity kw Ambient Temperature Cooling Capacity kw Ambient Temperature 7 INTALLATIN 7.1 Dimensions Chilled Water Temperature LBLGF20MT/Nb-M Chilled Water Temperature LBLGF50MT/Nb-M Water utlet Water Inlet C F Cooling Capacity kw Chilled Water Temperature LBLGF40MT/Nb-M Ambient Temperature Model LBLGF20MT/Nb-M LBLGF50MT/Nb-M LBLGF40MT/Nb-M D A A B E C D B E F GREE Central Air Conditioners GREE Central Air Conditioners 9

6 7.2 Rigging Instruction Attention to Riggers The center of gravity is not along unit center line. Ensure that the center of gravity aligns with the main lifting point before lifting. Use spreader bar when rigging, to prevent the slings during the unit. Caution All panels should be in place when rigging. Care must be taken to avoid damage to the coils during handling. Insert packing material between coils and slings as necessary. 7.4 Load Distribution Model R 1 R 2 R R 4 R 5 R 6 LBLGF20MT/Nb-M LBLGF50MT/Nb-M LBLGF40TM/Nb-H Installation Interspace LIFT LIFT 000 preader Bar PRPER INTERPACE T BE PRVIDED Mounting Location R6 R5 R ELECTRICAL DATA Model A R1 A R2 R LBLGF20MT/Nb-M LBLGF50MT/Nb-M A 150 LBLGF40MT/Nb-M Model LBLGF20MT/Nb-M LBLGF50MT/Nb-M Area of Electrical Wire 2 150mm 2 185mm LBLGF40MT/Nb-M 2 240mm 10 GREE Central Air Conditioners GREE Central Air Conditioners 11

7 9 ELECTRICAL DIAGRAM LBLGF20MT/Nb-M LBLGF50MT/Nb-M 12 GREE Central Air Conditioners GREE Central Air Conditioners 1

8 LBLGF40MT/Nb-M 10 CHEMATIC WIRING DIAGRAM ELECTRIC BX FIELD CNTRL WIRING ENTRANCE MAIN PWER ENTRANCE TYPICAL CNTRL BX LCATIN AND FIELD WIRING FIELD CNTRL WIRING CNNECTIN LEGEND MAIN PWER WIRING CNNECTIN 14 GREE Central Air Conditioners GREE Central Air Conditioners 15

9 11 CMMUNICATIN WIRING CNNECTIN AND ETTING WIRE CNTRLLER peration View N. Name Function description Power Run Error n/ff Reset The light is on when power connection is available, or else it is off. The light is on when unit is under operation, or else it is off the light is on when unit has any malfunction It is used to turn on or off the unit. Press the button for seconds when unit is off to turn on unit, press it for seconds when unit is on to turn off the unit. The button can't be press continuously Press it for second, the system can clear previous errors and run self-detected automatically again. This button cannot be pressed continuously 6 7 N. Name Function description Exit Enter LCD Menu structure of controller Heat pump type Main Control Menu Main Menu Paramter etting Module View User setting Version Module 1 In menu selection, press this button to move cursor to up or left one item; When setting parameter, press this button to increase the value. This button can be pressed continuously In menu selection, press this button to move cursor to down or right one item; when setting parameter, press this button to decrease the value. This button can be pressed continuously Press it to back to previous menu. This button can be pressed continuously In menu selection, press it to select item and enter below menu; When setting parameter, press it to save adjustment and move cursor. This button can be pressed continuously the area for displaying information User Par.. etting ys Par. Etting Debugging tartup Mode ound Backlight Auto Antifre. Auxiliary Heat Clock etting Timer etting Module 2 Module Module 4 Module 5 Module 6 Module 7 Module 8 Enter Password Password Change Tempe -rature View Water-out T Water-in T Defrost T Ambient T Antifre T. Discha-rge T. Pressure View High Pressure Low Pressure il Pressure tate View etting Par. by manual Compressor Fan 1 Fan 2 Fan 4-way valve Auxi-heat 1 Auxi-heat 2 ys tate Error View Previous Error Present Error Adopt default Par. C Water-in T. Defrost Intl Defrost Dur Adj. C Rate t C Rate Module 1 Module 2 Module Module 4 Module 5 Module 6 Module 7 Module 8 Force Defrost H Water-in T tartup Intl Adj. Intl il P Dif ys P Dif Antifre. Anti-ovh Auxi-heat n Auxi-heat ff. Defrost n Defrost ff 16 GREE Central Air Conditioners GREE Central Air Conditioners 17

10 Cooling only type Main Control Menu Main Menu Paramter etting Module View User setting Version tartup ound Backlight Clock etting Module 1 Module 2 Module Module 4 Module 5 Module 6 Module 7 Module 8 User Par.. etting ys Par. Etting Enter Password etting Par. by manual Password Change Timer etting Tempe -rature View Adj. C Rate Water-out T Water-in T Antifre T. Discha-rge T. Pressure View High Pressure Low Pressure il Pressure tate View Compressor Fan 1 Fan 2 Fan t C Rate ys tate Error View Previous Error Present Error Adopt default Par. C Water-in T. tartup Intl Adj. Intl il P Dif ys P Dif Antifre. Accessories =tandard =ptional P=Provide for oneself Model Accessories Name Module unit Display board Four-core control connection cord (8 meters) Water flow switch and water flow switch control board Electric control box Auxiliary electric heater Power connection wire Control connection cord Flexible joint Thermometer Pressure gauge Water tank Cooling only Heat pump P 12 MICRPRCER CNTRLLER Microprocessor Control The microprocessor controls overall unit operation and controls a number of processes simultaneously. These processes include internal timers, reading inputs, analog to digital conversions, fan control, display control, diagnostic control, output relay control, demand limit, capacity control, head pressure control, and temperature reset. ome processes are updated almost continuously, others every 2 to seconds, and some every 0 seconds. The microprocessor routine is started by switching the Emergency N-FF switch to N position. Pump control of. External pumps (where configured) will energize the cooler pump to the input occupied signal from external system. When the unit receives a call for cooling, the unit stages up in capacity to maintain the cooler fluid set point. The first unit starts 1 to minutes after the call for cooling. The microprocessor controls the capacity of the chiller and the loading capacity to satisfy actual dynamic load conditions. The control maintains leaving-fluid temperature set point shown on the panel interface through intelligent positioning of the slide valve and compressor cycling. Accuracy depends on loop volume, loop flow rate, load, and outdoor-air temperature. No adjustment for cooling range or cooler flow rate is required, because the control automatically compensates for cooling range by measuring both return-fluid temperature and leaving-fluid temperature. This is referred to as leaving-fluid temperature control with return-fluid temperature compensation. The basic logic for determining when to add or remove capacity is a time band integration of deviation from set point plus rate of change of leaving-fluid temperature. Control equence tart-up After control circuit switches on, the pre-start process takes place, then microprocessor checks itself, starts pump and waits for temperature to stabilize. The controlled pull down feature limits compressor loading on start-up to reduce demand on start-up and unnecessary compressor usage. Capacity control n the first call for cooling, the microprocessor starts compressor and fan stage on lead unit. As additional cooling is required, the capacity of the compressor is increased by changing the position of the slide valve. As the load increases above the compressor's capacity, another unit's compressor is started and both staged together. The speed at which capacity is added or reduced is controlled by temperature deviation from set point and rate of temperature change of chilled fluid. The Main Base Board (MBB) responds to the supply chilled water temperature to cycle the compressors to match cooling load requirements. The Minimum Load control valve is energized by the MBB. The valve allows hot gas to pass directly into the cooler circuit on the initial step of unloading, permitting the unit to operate at lower loads with less compressor cycling. ensors Thermistors are used to control temperature-sensing inputs to the microprocessor. No additional thermistor sensors are required for optional leaving chilled water temperature, return water, or outdoor air. Two refrigerant pressure transducers are used for sensing suction and discharge pressure. The microprocessor uses these inputs to control capacity and fan cycling. 18 GREE Central Air Conditioners GREE Central Air Conditioners 19

11 1 LNG-DITANCE MNITRING YTEM 4-core crystal phone plug 1.1 Introduction to Long-distance Monitoring ystem As the development and improvement of manufacturing technology and in order to solve the problems of complex distribution of the central AC in the buildings and difficult control and maintenance of them, an platform easy and reliable to operate must be provided to the users for daily management and maintenance. o this long-distance monitoring system combining electronic communication and computer technologies is developed to collect the running state of the units and to monitor and control the units from a long distance. 1.2 Installation and election. Crystal phone plug 485 A line 485 B line Notice 1.The address code of the communication modules should not be conflicted in one project. 2.ptoelectronic Isolated Repeater: every 800m of communication distance equipped needs one and every 0 communication modules equipped needs one. cope of upply cope of upply Communication module set FE0-22/E =tandard parts; = User ptional; P= User Provided Parts Type election PC P Please check 7.Installation Criteria Air cooled screw (heat pump) chiller Long-distance Monitoring ystem set FE0-22A(M) ptoelectronic isolated repeater Rs485 4-core twisted pair wire -way phone connector P P Remarks Including communication module ZJ522, power transformer and connecting wire Including CD and optoelectronic isolated converter Rs22- Rs485 ne every 800m of communication distance equipped with one and ne every 0 communication modules equipped with one. Confirmation of Quantity of Parts Types Qty of Communication Modules Long-distance Monitoring ystem ptoelectronic Isolated Repeater.the communication cable and heavy-current wire should be separated and the distance between them can not be below 15cm. 4.line A and line B of Bus 485 should respectively correspond with line A and line B. 5.crystal head(crystal head buckle is downwards). All type ne unit equipped with a communication module ZJ522 1 Air cooled screw (heat pump) chiller Long-distance Monitoring ystem set FE0-22A(M ne every 800m of communication distance equipped with one. ne every 0 communication modules equipped with one 20 GREE Central Air Conditioners GREE Central Air Conditioners 21

12 election Example sets of units LBLGRF250M, 4 communication modules are needed, the communication distance is above 800m, then one repeater is necessary, and the quantity of communication modules is below 0 the repeater is unnecessary, as follow: Project Requirements Communication module set FE0-22/E Quantity Qty set (LBLGRF250M) Description of above communication cables Cable D H2 Description Crystal head and the other end is XH 4-core pin connector 2-core Type-V twisted pair wire both crystal head(tandard parts) crystal head and the other end connects of it connects with wiring terminal of converter. (2-core Type-V twisted pair wire both 9-core head (tandard parts) Air cooled screw (heat pump) chiller Long-distance Monitoring ystem set FE0-22A(M) Repeater Wiring Diagram Network 1 Unit Module1 Unit Module8 Unit Module1 Unit Module CENTRAL AC BM INTERFACE Introduction to BM interface of Gree Central AC BM interface of Gree Central AC is only for Gree central AC devices. There is BM interface or multifunctional gateway in the hardware and standard communication protocol and BM software plug-in in the software. Gree central AC can be centrally monitored and managed through BM interface together with other devices in the building. Displayer 1 Displayer n CM1 CM1 CM2 CM2 onitoring Center ZJ5221 ZJ5222 ZJ522n PC H2 R Converter Network n Unit Module1 Unit Module8 Unit Module1 Unit Module8 R+/D+---Rs485A R-/D---Rs485B Displayer m Displayer 254 D CM2 CM Installation and election ZJ522m ZJ522m+1 ZJ Notice 1.The air conditioners could be connected with the BM system with every different model, or several models together, below wiring diagram shows the connection way of single unit, just for easy drawing. ( Please check 1.2) 22 GREE Central Air Conditioners GREE Central Air Conditioners 2

13 cope of upply Wiring Diagram =tandard parts; = User ptional; P= User Provided Parts cope of upply Type election Remarks File of protocol Modbus protocol is used for user to integrate with BM system. Communication module FE0-22/E Long distance monitoring set FE0-22A(M) optoelectronic isolated converter Rs22- Rs485 ptoelectronic isolated repeater Rs485 4-core twisted pair wire -way phone connector P P Including communication module ZJ522, power transformer and connecting wire Including CD and optoelectronic isolated converter Rs22- Rs485 It is needed when the interface protocol of BM system is Rs22 ne every 800m of communication distance equipped with one and ne every 0 communication modules equipped with one. Unit Module1 Unit Module8 Unit Module1 Unit Module8 CM1 ZJ5221 Displayer 1 CM2 CM2 ZJ5222 Network 1 CM2 ZJ522n Displayer n Just for Rs22 interface of BM BM Confirmation of Quantity of Parts Types Qty of Communication Modules ptoelectronic isolated converter ptoelectronic Isolated Repeater Network n Unit Module1 Unit Module8 Unit Module1 Unit Module8 R Converter R+/D+---Rs485A R-/D---Rs485B All type ne unit equipped with a communication module ZJ522 ne if BM CM is Rs22 ne every 800m of communication distance equipped with one. ne every 0 communication modules equipped with one. CM2 Displayer m Displayer 254 CM2 ZJ522m ZJ522m+1 ZJ D election Example BM CM is R22,one converter is needed. sets of units LBLGRF250M, 4 communication modules are needed, the communication distance is above 800m and one repeater is necessary and the quantity of communication modules is below 0 repeater is unnecessary, as follow: Project Requirements Quantity Qty set (LBLGRF250M) Communication module set FE0-22/E Repeater ptoelectronic Isolated Converter 1 1 Description of above communication cables Cable Description Crystal head and the other end is XH 4-core pin connector both crystal head(tandard parts) D crystal head and the other end connects of it connects with wiring terminal of converter. 24 GREE Central Air Conditioners GREE Central Air Conditioners 25

14 14 APPLICATIN DATA Unit Location The chillers are designed for outdoor installation. When selecting a site for installation, be guided by the following conditions: 1. For outdoor locations of the unit, select a place having an adequate supply of fresh air for the condenser. 2. Avoid locations beneath windows or between structures where normal operating sounds may be objectionable.. Installation sites may be either on a roof, or at ground level. 4. The condenser fans are the propeller-type, and are not recommended for use with duct work in the condenser air stream. 5. When it is desirable to surround the unit(s), it is recommended that the screening be able to pass the required chiller CFM without exceeding 0.1" of water external static pressure. 6.Recommended clearances for units are given in DIMENIN. When the available space is less, the unit(s) must be equipped with the discharge pressure transdu-cer option to permit high pressure unloading in the event that air recirculation were to occur. Foundation The unit should be mounted on a flat and level foundation, ground or roof, capable of supporting the entire operating weight of the equipment. perating weights are given in the Dimension. For ground level installations, precautions should be taken to protect the unit from being tampered by or injuring to unauthorized persons. crews on access panels will prevent casual tamper-ing; however, further safety precautions, such as unit enclosure options, a fenced-in enclosure, or locking devices on the panels may be advisable. Check local authorities for safety regulations. Chilled Liquid Piping The chilled liquid piping system should be laid out so that the circulating pump dis-charges into the cooler. The inlet and outlet cooler liquid connections are given in Dimension Delivery and Handling A.Unit shall be delivered to job site fully assembled, and charged with refrigerant and oil by the manufacturer. B.Unit shall be stored and handled according to the manufacturer'sinstructions. Leveling Unit Unit must be leveled when installed to ensure proper oil return to the compressors. Fluit Temperature Maximum leaving chilled fluid temperature for unit is 59 (15 ). For continuous operation, it is recommended that inlet fluid temperature does not exceed 86F(0 ) ( If continuous operation is required for inlet water temperature above 86 (0 ), please contact GREE factory). Minimum leaving chilled fluid temperature for standard unit is 8 (. ) (For lower leaving temperature contact GREE factory). Cooler Flowrange: Chiller ratings and performance data pertain to cooling temperature rise of 10. Chillers maybe suitable for operation in a range from 5.4 to 14.5 temperature rise without adjustment, provided flow limits are not exceeded. High flow rate is limited by pressure drop that can be tolerated ( for any high flow rate value larger than values in performance tables, please contact GREE factory). Minimum Cooler Flow: Minimum cooler flow will be based on the maximum permissible AT across the cooler 14.5 Maximum Cooler Flow: It Will be based on Minimum permissible AT across the cooler 5.4 Cooler Protection A protection against low ambient freeze-up is required for ambient temperatures below 2 (0 ). Protection should be in the form of: Inhibited ethylene glycol or any other suitable glycol. Condenser Airflow Any restrictions on units fan airflow will affect unit capacity, condenser head pressure, and compressor power input. uch restrictions (i.e. not providing vertical clearance or lateral clearance, insufficient unit-to-unit clearance ) will cause warm air re-circulation or coil starvation. Minimum required operational and maintenance clearances around the unit are shown in the figure below. High Ambient Temperature High outdoor ambient chiller start-up and operation are possible for chillers at ambient temperatures up to ) at nominal voltage (for standard units). For higher ambient temperature please contact GREE factory. 2 GREE Central Air Conditioners GREE Central Air Conditioners 24