| Customization: | Available |
|---|---|
| After-sales Service: | Local/Official |
| Warranty: | One Year |
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SUPERIORPERFORMANCE
As a HVAC system can use 40-45% of a building's annual energy consumption, choosing the right chiller can significantly reduce energy cost and help users save their operational budgets. Thanks to Hitachi's latest inverter compressor technology, the new V series provides best-in class efficiency. Its full load efficiency goes up to 3.28, which far exceeds the ASHRAE90.1 building energy standard. Meanwhile, its part load efficiency is as high as 6.0, which adds up to an average annual energy savings of 15- 25%, compared to traditional air-cooled chillers.
Hitachi DC Inverter Compressor
Since pioneering the world's first production of scroll compressors for packaged air-conditioning in 1983, Hitachi has accumulated almost 40 years of experience in the design and production of leading scroll compressors, especially in the field of HVAC applications. The V Series uses the proven design of the direct current (DC) inverter compressor, which embraces all of the design features driven for exceptional efficiency all year around. The inverter compressors deliver stepless capacity control from 25% to 100%, allowing precise capacity matching for building loads and reducing unit power input, thus providing signifcant energy consumption savings for the customer.Energy Saving At Low LoadThe Variable Speed Driver
The variable speed driver make the utilization of electrical power more efficient, typically it is measured as power factor.The V Series offers an outstanding power factor, as high as 95%. The customer does not need to pay the premium for the additional power factor correction solution to meet minimum utility requirements.
Air Side Heat Exchanger
Air side heat exchanger adopts a coils design in a V shape with open angle, which is optimized by CFD tools for air flow distribution simulation. The design ensures a uniform heat transfer with 30% efficiency improvement. Meanwhile the V shape structure effectively enhances the unit's structural strength and limits the risk of coil surface damage during the transportation and installation process.GREAT FLEXIBILITY
Thanks to its modular design type, the V series offers superior flexibility throughout the product's life cycle. From design engineer to installer, mechanical and electrical contactor, from end user to service people, almost every stakeholder will get substantial benefits from V series due to its great features in flexibility and practicality, making life easy and simple.
Easy shipment & installation
The modular design allows easy storage; each module can be transported individually, which enhances mobility and allows convenient installation.
The system can be expanded by adding modules, which allows multi-phase investment according to each
building's load.
A quick lead time due to standardized modular design.
Easy layout
A compact structure saves layout footprint on-site.
Single modules can be arranged flexibly according to site layout.
Easy operation
Systematic factory run tests before shipment ensure a trouble free start-up.
Great system redundancy - if unexpected faults occur in one module, the remaining modules will operate as backup.
Easy maintenance
When one module is being serviced, the system can still keep in operation, which can minimize downtime for the customer.
A standardized design for each module ensures availability of parts and a quick response time for replacement.
QUIETOPERATIONNowadays, modern cities demand more stringent sound level requirements than years before. In the real world, chillers run
99% of the time in off-design conditions - thus the sound performance at partial load really counts. The traditional fixed
speed chillers address limited reduction in sound level at partial load. While for the inverter chiller, thanks to the inverter
technology, the compressor frequency can be lower down and result in a significant sound reduction, in most case, the
expensive sound enclosure are not necessary.
ROBUSTRELIABILITY
Hitachi is recognized as the market leader for its outstanding reliability. This reputation is built on years of repeated iteration, improvement and research and the highest level of engineering and design development.
Hitachi Inverter Compressor
Since introducing the world's first production of scroll compressors for packaged air-conditioners in 1983, Hitachi has built its great reputation for delivering superior products, resulting from years of research and thousands of test hours, including extensive testing under extraordinarily severe operating conditions. The V Series chiller adopts the latest generation scroll compressor which embraces all the design features that made Hitachi product such a success in HVAC application.Low Inrush Current
As V series contains variable speed drive for compressors, this avoids shocks to the motors and drives from sudden current surges during start-up. Starting the compressor at low frequency and bringing it up to full speed gradually will reduce stresses. As a result, the low current will bring less heat and help to extend the lifecycle of the motor. Meanwhile, the electronics can be planned based on minimum current capacity, which can reduce the extent of the wiring.
Trouble-Free Start-Up
All V series chillers are given a complete functional test at the factory. This test program checks the sensors, wiring, electrical components and fans. In addition, each compressor is test-run to verify function and performance, ensuring that the chiller arrives at the job site fully tested and ready for operation.
ENVIRONMENTAL BENEFITSThe new V Series is designed for sustainability. To reduce the direct environmental impact, it employs R410a refrigerant
with zero ozone depletion potential (ODP), which is recognized as reliable replacement of R22. Meanwhile Hitachi's strict
manufacturing process and factory tests before shipment ensure a leak-resistant refrigerant system.
Besides, the V Series makes the customer facility more sustainable in an invisible way: The chiller's exceptional all year
round performance allows the less power consumption with reduced the power plant CO2 emission, which accounts for 80%
of global warming potential (GWP) associated with chillers.
SMART CONTROL
Auto-adaptive control combines intelligence with operating simplicity. The control constantly monitors all machine parameters and precisely manages the operation of compressors, expansion devices and fans for maximum energy efficiency.User-friendly interface
- The standard system controller display features a 4.3" colored touch-screen, allowing access to all operational inputs and outputs.
- Units use intuitive tree-structure menus, permitting quick and easy access to available chiller data, including operating parameters of each master and slave unit: operating mode, water temperatures and set points, outdoor air temperature, set point, compressors operating status and running hours, refrigerant system parameters, etc.
Advanced control function
- The system controller can support up to 16 modules in one system, which can offer a wide system capacity range and give flexibility for capacity extension.
- Unit basic control function including: Unit ON/OFF, user safety interlock, water pump control, operation indication, circuit alarm and alert etc.
-Time of day scheduling allows the customer to perform simple chiller scheduling without the need for an entire automation system for the building. For example, the user can easily specify start up and shut down times in a 7 day time period.
- Free switching between master and slave units to effectively improve system reliability in case a master unit experiences a problem.
Alarm and diagnostic
- Real time monitoring of the system parameters to ensure the chiller system has a safe and stable operation. The system provides more than 10 unit control protection, such as water flow detective, water temperature out of range protection, refrigerant high/ low pressure cutout, compressor reverse/ overload, motor overload, anti-freeze protection, etc. The diagnostic history records can be easily visited via the system controller.
Remote control / communication
- Stand-alone controls: the unit control system is equipped with remote start and stop contacts, and users can apply remote switch control according to needs.
- Building automation system (BAS) controls: unit have standard RS-485 communication interface with built-in Modbus communication protocol, which allows networked group control via system integration with BAS.
Notes:
1. Nominal cooling mode: water heat exchanger entering/leaving water temperature 12/7°C, outside air temperature 35C
2. Nominal heating mode: water heat exchanger entering/leaving water temperature 40/45 c, outside air temperature rc
3. Water heat exchanger fouling factor 0.018m K/kW
4. Customer side flange and thead pipe is not provided with the unit
5. Main power supply: 380V-3Ph-50HzTechnical requirements:
1. The anti-vibration pads shall be installed between the unit base and basement per drawing, 6 sets of pad per unit.
2. L is the minimum spacing between two modular chiller in a row, and L is 2 500mm.
3. For multiple rows of installation, the minimum spacing between adjacent two rows is 1500mm
4. The installation basement shall be concrete structure or channel steel frame that is strong enough to support unit operating weight.
5. The unit design for low-vibration, but it is possible to generate vibration when the installation basement is poor. Please install anti-vibration table or strengthen the installation basement strength.
6. Water may be accumulated under conditions such as rain or defrost, so the foundation shall be flat with drainage holes to drain water in a timely manner
7. Please use the hose pipe when connecting the unitsTechnical requirements:
1. The anti-vibration pad is provided with the unit. The anti-vibration pad shall be arranged according to the drawing shown in the drawing, i. e. 6 sets of pad per unit.
2. N is the total number of modular units installed in the same row, L is the minimum spacing between sets, and L is 2 800mm.l
3. If multiple lines of installation are required, the minimum spacing between adjacent two rows is 1500mm.
4. The unit is a low-vibration unit, but it is also possible to generate vibration when the installation facility is poor. Please install the anti-vibration table or strengthen the installation facility strength.
5. In principle, the foundation shall be integrated with the floor. In other cases, in addition to calculating the vibration resistance of the unit installation, the vibration resistance of the unit+foundation shall be calculated, so as to confirm the strength situation in the case of tilting or moving.
6. Water may be accumulated under conditions such as rain or defrost, so the foundation shall be flat and the floor shall be provided with drainage holes to drain water in a timely manner
7. Please use the hose when connecting to the water pipe.Note:
1. The unit shall supply the water inlet and outlet temperature sensor, and the user shall arrange them according to the on-site condition.
2. The corresponding water flow switch is not supplied, and shall be provided by the user.Note:
1. Wires between chiller units should be prepared by the user.
2. Communication lines must use shielded twisted pairs that are forbidden to mix with strong electricity.
3. The hand-operated device is an optional item with a 3 m communication line, and the communication line between the host and the hand-operated device is provided by the user.
4. It is suggested that the hand-operated device is installed in the box body separately, and the box body, the termianl and the switch power supply are provided by the user.
Precautions for start-up debugging
1. Confirm that the installation foundation of the unit is firm, the drainage and drainage of the on-site unit are smooth, and the on-site heat exchange and ventilation effect is good
2. Check that there is no leakage in all waterway parts, good thermal insulation, and the flow rate and head of the pump meet the engineering requirements;
3. Check that the phase sequence and power supply voltage of the power supply are correct, and the power cable diameter can meet the maximum power load of the unit;
4. After ensuring that the above items are correct, the first power on of the unit needs to be powered on 12 hours in advance to prepare for the preheating of the unit;
5. Make sure that the unit is powered on for more than 12 hours, please turn on the circulating water pump to empty the air conditioning water system, and start the unit after emptying;
6. Check and record the measured data of the unit, including current, voltage, suction pressure, inlet and outlet water temperature, fin temperature, suction and exhaust temperature, compressor opening quantity, etc.
Maintenance precautions
1. For the water system, it is recommended that the customer inspect it every half month;
2. When used for the first time during the change of seasons every year, the unit must be powered on and preheated for 24 hours before it can be turned on;
3. If the unit is not used for a long time, it is necessary to drain the water in the unit and the piping;
4. If the ambient temperature is too low, a water pump can be manually turned on to prevent the pipe or the unit is frozen;
5. The main engine should not be operated frequently, not more than 12 times per hour, and the electric control box should be protected from moisture;
6. Always keep a good heat exchange environment around the unit, the exhaust air of the unit should not be short-circuited with the return air of the unit, and the air side heat exchanger should be cleaned and dusted regularly;
7. The water system should be cleaned regularly because the water quality is kept clean;
8. There should be a special person for maintenance and record.
Warranty service commitment:
1. Free repair and replacement of parts during the warranty period;
2. Lifetime maintenance;
3. Paid services are provided outside the warranty period and spare parts are provided at preferential prices.
Warranty period:
The free warranty period for the whole machine is 1 year from the date of delivery.
Warranty certificate:
In the event of a fault during the warranty period, the user must provide the purchase contract (or purchase invoice) and the project completion acceptance data for warranty. If there is no purchase contract (or invoice) or project completion acceptance data, it will be calculated based on the product number. If there is no such data, paid maintenance service will be provided.
The following situations are not covered by the warranty:
1. Damage caused by poor power supply and improper use, storage, transportation and maintenance by the user;
2. Expiration of the warranty period;
3. Damage caused by installers/service providers not authorized by our company;
4. Damage caused by self-repair or disassembly of the product by the user;
5. Counterfeit brand products;
6. Damage caused by force majeure;
7. Uncommitted warranty service content.
Supply of repair parts
1. The contracted repair service provider has a certain amount of repair parts in stock, and provides users with full-time after-sales repair and maintenance services at the fastest speed.
2. The supply of repair parts outside the warranty period is provided to users at the fastest speed according to the parts supply process during the warranty period, and the price of repair parts is implemented according to the market price.
Maintenance after the warranty period
After the warranty period, paid maintenance services can be provided to users and a "Unit and Engineering Maintenance Contract" can be signed. This fee is negotiated with the user in accordance with the prescribed standards. The repair technical service personnel of the contracted repair service provider will conduct regular routine inspections and maintenance on the user's unit according to the contract requirements, and provide original spare parts and preferential repairs. At the same time, the user's unit will be listed and designated for maintenance, computer system testing and computer file management.
Service content and methods during the warranty period
a. Regular on-site inspection.
b. Regular technical training.
e. Free service commitment during the warranty period. Very low-cost inspection and maintenance agreement.
A Maintenance content during the warranty period
1.Whether the high and low pressure gauges of the fluorine system are normal and whether the high and low pressure protection is effective.
2.Check the fluorine system of the unit to see if there is any leakage.
3.Whether the chilled water sensor is normal.
4.Whether the anti-freeze sensor can work normally.
5.Whether the oil heater can work normally.
6.Compressor inspection: the quality and quantity of lubricating oil, the working current of the compressor, and whether various protection devices can work normally.
7.Whether the power supply voltage is within the normal range and whether the phase deviation is within the normal range.
8.Whether the unit overcurrent protection and phase sequence protection are effective.
9.Check other circuits, contactors, and relays to see if there are any problems such as incorrect connection.
10.Routine inspection of the evaporator to see if the configuration of the chilled water system is reasonable.
11.Routine inspection of the condenser and whether the configuration of the cooling water system is reasonable.
B Annual maintenance content of the third year
I. Refrigeration system
1. Recover or discharge the refrigerant into the condenser
2. Pressurize with the nitrogen system and check for leaks; and carefully check the tightness of each valve in the refrigerant circuit.
3. Check all safety valves for corrosion, rust, dust accumulation, scaling, and leakage.
II. Evaporator
1. Chemically clean the evaporator water circuit, check the corrosion and scaling of the evaporator, and put forward corresponding treatment opinions if necessary.
2. Check whether the temperature sensor related to the evaporator is normal and whether the pressure gauge thermometer is normal.
III. Condenser
1. Open the condenser end cover and clean the condenser cooling water heat exchange tube with chemicals
2. Check the corrosion and scaling of the heat exchanger, and put forward corresponding treatment opinions if necessary.
3. Check whether the temperature sensor related to the condenser is normal and whether the pressure gauge thermometer is normal.
IV. Electrical and control inspection
Check whether the motor insulation is good.
Check all circuits for looseness or overheating, and take appropriate measures if necessary.
Check and adjust all pressure/temperature sensors.
High and low pressure controllers
Motor winding temperature protection switch
Fusible plugs
Antifreeze protection temperature controller
Check and calibrate water flow switches.
V. Dehumidify and vacuum the refrigeration system, add refrigerant, debug the unit, and issue a debugging report.
C Regular inspection work content
1. Interpret and analyze the operation records, point out abnormal data, and make corresponding improvement suggestions
2. Check whether there are signs of leakage of refrigerant and refrigeration oil. If so, deal with it in an emergency.
3. Check whether the refrigeration system has obvious abnormal temperature and pressure.
4. Check whether the control is normal and whether the thermal expansion valve is working well.
5. Whether the unit operating voltage and current are normal.
6. Whether the control system functions normally, adjust if necessary.
7. Whether the power supply line and control wiring are tight and clean.
8. When the unit is running, whether the temperature and pressure of the cooling chilled water system are normal.
9. Whether the unit has abnormal noise and vibration.
10. Submit inspection report or suggestions for acceptance by the owner.
D. Maintenance instructions:
Due to the large number of unforeseen items in the material part of the maintenance work of Hitachi water-cooled screw chillers, the quotation for the materials that must be used is as above. During the maintenance process, if parts (not included in the quotation materials) need to be replaced, the parts and materials fee will be added separately after confirmation by the on-site person in charge of Party A.
1.Q:How to installation the air cooled chiller
A:The air-cooled chiller's condenser is finned, and the fan is installed on the top of chiller, it's used to dissipate heat to achieve heat exchange.
Compare with water cooled chiller, air cooled chiller's installation is much simpler, as long as the air-cooled chiller and user equipment connect through pipes.
The specific installation procedure is as follows:
1. Before installation, should choose a flat open space. It is best to re-build the cement foundation to ensure the levelness of the ground. After the installation, there must be a free space for future maintenance, and ensure that the ground can withstand Maintain the operating weight of the chiller.
2.Different chiller model with different inlet and outlet diameters. When installing, should choose water pipes with matching diameters and connect them correctly.
3.No matter under any load conditions, should ensure that the chiller's water flow is normal and stable.
4.The design and installation of water pipes should be carried out in accordance with relevant standards, and the water pump should be located higher than water inlet pipe, to ensure the positive pressure and flow of the unit.
5. Water pipe should have a firm support independent of the chiller, avoiding the force exerted on components of an air-cooled chiller. To reduce noise and vibration, it is best to install vibration isolators on the piping.
6. In order to the air-cooled chiller can running safely and stably, to ensure the normal use of each component, the poor water quality can be treated to avoid various sundries or corrosion deposits and the existence of pipes, evaporators, and condensers that affect the heat exchange effect , increasing maintenance costs in the later period.2.Q:What's The Difference Between R22 And R410a Refrigerant
A:The normal water chiller manufacturer make the chiller usually use R22 refrigerant in China, but R22 is not friendly with environment, will bring Ozone layer destruction, so the eco-friendly type refrigerant be request more and more by the customers from different country.
R410a is one of the choose.
With the increasing use of R410A refrigerant, can we directly replace R22 with R410a in the chiller system?
NO. because the physical and chemical parameters of the two kinds of refrigerant are different, which should be paid attention to in the system design.
The difference about R22 and R410a:
1. R410a request POE, with high hygroscopicity and easy hydrolysis, so compared with R22, The R410A system has more stringent requirements for moisture content.
2. Filling volume. after the structure of heat exchanger is reduced, the filling volume of R410a system is reduced about 20%~30%, compared with R22 system, it has greater heat transfer characteristics, with higher heat transfer efficiency, the heat exchanger can be miniaturized.
3. R410a is mixed refrigerant by HFC-32(R32) and HFC-125, the running pressure higher 50~70% than R22, so it's with the higher requirements for copper pipe than R22.
4. R410A with low toxicity, does not burn and spread, and does not damage the ozone layer,R22 is deadly to the ozone layer. R410a cooling efficient is higher 47% than R22.
5. R410A has a higher vapor density than R22, so the vapor flow rate of R410A is about 30% slower than R22. R410A is more soluble than R22. When the residue floats in R410A, it circulates smoothly through the system.
Announcements when choose R410a refrigerant:
1. R410A copper pipe must use high strength pressure special copper pipe, spare parts must also use special. You can use R410a copper pipe instead of ordinary R22 copper pipe, but can't use ordinary R22 copper pipe instead of R410a copper pipe.
2. When installing the R410A new refrigerant split, it must not be confused with the connecting pipe and refrigerant used in the R22 air conditioner.
3. During maintenance, if the refrigeration system is cut, the filter dryer must be replaced, and the refrigeration system should not be exposed to the air for more than five minutes.
4. The R410A refrigerant must be stored at an environment lower than 30°C. If it has been stored at an environment higher than 30°C, it must be stored at an environment lower than 30°C for at least 24 hours before use.
5. The four-way valves used in the R410A system have clear requirements on cleanliness, while the four-way valves used in the R22 system have no requirements on cleanliness.
6. The maximum design working pressure of the globe valve is different. The use of refrigerant R22 is 3.0MPa, and the use of refrigerant R410A is 4.3MPa. The R22 is 3.0MPa brass and the R410A is 4.3MPa stainless steel.
7. The pressure switch value is different. 3.0/2.4MPa is usually selected for R22 system, 4.2/3.6MPa is usually selected for R410A system.
8. At the rated voltage, the compressor of the R22 system has about 175W per displacement (1cc). The compressor of the hot R410A system has about 245W per displacement (1cc), which is about 65% to 70% of that of the R22 system
3.Q:What are the main functions of water-cooled screw chillers:
A:The main functions of a water-cooled screw chiller include refrigeration, heating, heat recovery, and cold recovery. These features make it an efficient and reliable refrigeration device, widely used in various industrial and commercial fields.
Double head water-cooled screw chiller unit
Firstly, the cooling function of the water-cooled screw chiller can reduce the temperature of the target object to the desired value. This function makes it a key equipment in many industrial production processes, such as food processing, chemical, pharmaceutical and other fields. In these fields, the production process needs to be maintained within a certain temperature range, and water-cooled screw chillers can accurately control the temperature to ensure the stability of the production process and product quality.
Secondly, the heating function of the water-cooled screw chiller can raise the temperature of the target object to the desired value. This feature makes it an important equipment in many commercial places, such as shopping malls, hospitals, hotels, etc. In these places, it is necessary to maintain indoor temperature within a comfortable range, and water-cooled screw chillers can provide stable heat sources by heating as needed.
In addition, the heat recovery function of water-cooled screw chillers can recover and reuse the thermal energy in the system. This feature makes it an ideal choice for many high energy consuming fields, such as data centers, hospitals, etc. In these fields, a large amount of energy is consumed for heating and cooling, and the heat recovery function of water-cooled screw chillers can recycle and reuse this energy, reducing energy costs.
Finally, the cold recovery function of the water-cooled screw chiller can recycle and reuse the cold energy in the system. This feature makes it an ideal choice for many fields that require a large amount of cooling, such as data centers, laboratories, etc. In these fields, a large amount of energy is consumed for cooling equipment, and the cold recovery function of water-cooled screw chillers can recycle and reuse this energy, reducing energy costs.
In summary, the main functions of water-cooled screw chillers include refrigeration, heating, heat recovery, and cold recovery. These features make it an efficient and reliable refrigeration device, widely used in various industrial and commercial fields.
4.Q:Working principle of screw chiller unit
A:When the unit is cooling, the compressor sucks the low-temperature and low-pressure refrigerant from the evaporator into the cylinder. After the compressor does work, the refrigerant vapor is compressed into high-temperature and high-pressure gas,
Enter the condenser through the exhaust pipe. The high-temperature and high-pressure refrigerant gas exchanges heat with the cooling water in the condenser, transferring heat to the cooling water and taking it away, while the refrigerant gas condenses into high-pressure liquid. The high-pressure liquid coming out of the condenser is throttled and depressurized by the thermal expansion valve before entering the evaporator. In the evaporator, the low-pressure liquid refrigerant absorbs the heat of the chilled water and vaporizes, causing the chilled water to cool down and become the required low-temperature water. The vaporized refrigerant gas is sucked back into the compressor for compression and discharged into the condenser, repeating this cycle to achieve cooling of the chilled water.
The chilled water coming out of the unit enters the end devices such as fan coil units and variable air volume air conditioning units indoors, where it exchanges heat with convective air. During this process, the water absorbs heat from the indoor air (dissipating heat to the indoor air), causing the temperature to rise. The indoor air, after passing through the indoor heat exchanger, decreases in temperature and is driven by the fan to enter the room, thereby reducing the indoor air temperature. The chilled water, which has risen in temperature, enters the unit again under the action of the water pump and circulates in this way to achieve continuous cooling.
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