| Customization: | Available |
|---|---|
| After-sales Service: | Local/Official |
| Warranty: | One Year |
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Superior Performanc
High-quality components makes AVSY series have high efficiency
-HITACHI DC Inverter Scroll Compressor
-"U Shape" Air Heater Exchanger
-Brazed Plate Heat Exchanger Water-side heat exchanger
-High Precision Electronic Expansion Valve
-Intelligent VFD Control logic
-High Efficiency Fan System
-Hydrophilic Fin
Hitachi DC Inverter Compressor
-40 years of experience in scroll compressor design and production
-Features the latest technology for exceptional performance all year round
-Delivers stepless capacity control from 25% to 100%, allowing precise capacity matching for building loads and reducing the unit's power inputGreat Flexibility
Flexible combination
-Flexible model connection (65/130kW)
-Support up to 16 units per system ranging from 65-2064kw, easy for system capacity extension
-Easy to re-size system by adding or removing modules
Easy installation and maintenanceRobustReliability andOperating Safety
Multiple system protection functions to ensure reliable operationModular provides excellent system redundancy
-Free switching master/slave unit to reduce failure of the unit.
-Function independently of each other. When a unit is down, another standby module will run as backup.While one unit is being serviced, the others still run as normal without impacting on operational capabilities.
-Modularized manufacturing and standardized components ensures easy replacement.
Smart defrost/Manua l defrost
-Smart defrosting function according to the unit's conditions. Avoids unnecessary defrosting operation or inadequate defrosting.
-Manual defrosting to remove ice layer under harsh environmental condition.
Trouble-Free Start-up
-The compressor starts at low frequency and gradually increases to full speed
-Low start current helps extend the life of the motor
Intelligent ControlOptimized Control Logic
-Automatically adjusts number of units operating as per operating frequency
-By optimizing operating frequency and controlling steps keeps units running under partial load conditions to improve efficiency
-Flexible operating frequency and control steps enable the unit working efficiently
| Model | RCUA065AVSY | RCUA130AVSY | RHUA065AVSY | RHUA130AVSY | |
| Nominal Cooling Capacity | 65 kW | 129 kW | 65 kW | 129 kW | |
| Power Input (cooling) | 20.9 kW | 42 kW | 20.9 kW | 42 kW | |
| COP (cooling) | 3.1 kW/kW | 3.1 kW/kW | 3.1 kW/kW | 3.1 kW/kW | |
| Nominal Heating Capacity | - | - | 66 kW | 132 kW | |
| Power Input (heating) | - | - | 21.8 kW | 43.7 kW | |
| COP (heating) | - | - | 3.03 kW/kW | 3.02 kW/kW | |
| IPLV | 5.41 kW/kW | 5.46 kW/kW | 5.46 kW/kW | 5.46 kW/kW | |
| Refrigerant | R410A | ||||
| Flow Control | Electronic expansion valve | ||||
| Circuit No. | 1 | 2 | 1 | 2 | |
| Compressor Capacity Control | 25-100 % | 25-100 % | 25-100 % | 25-100 % | |
| Noise | 68 dB | 71 dB | 68 dB | 71 dB | |
| Compressor | - Type | Variable speed scroll compressor | |||
| - Quantity | 2 set | 4 set | 2 set | 4 set | |
| Water-side heat exchanger | - Type | Plate heat exchanger | |||
| - Water flow rate (cooling) | 10.08 m³/h | 20.16 m³/h | 10.08 m³/h | 20.16 m³/h | |
| - Pressure Drop | 44.7 kPa | 32.5 kPa | 44.7 kPa | 32.5 kPa | |
| - Water Connection | DN50 clamp | DN65 clamp | DN50 clamp | DN65 clamp | |
| - Max. water-side operating pressure | 1.0 Mpa | 1.0 Mpa | 1.0 Mpa | 1.0 Mpa | |
| Air-side heat exchanger | - Type | Grooved copper tubes and aluminum fins | |||
| - Fan Power | 1.65 kW | 3.3 kW | 1.65 kW | 3.3 kW | |
| - Quantity | 1 | 2 | 1 | 2 | |
| - Air flow rate | 21,500 m³/h | 43,000 m³/h | 21,500 m³/h | 43,000 m³/h | |
| Dimension | - Length | 1,370 mm | 2,438 mm | 1,370 mm | 2,438 mm |
| - Width | 1,200 mm | 1,200 mm | 1,200 mm | 1,200 mm | |
| - Height | 2,410 mm | 2,410 mm | 2,410 mm | 2,410 mm | |
| Net Weight | 485 kg | 910 kg | 545 kg | 1,030 kg | |
Notes:
1. Nominal cooling mode: water heat exchanger entering/leaving water temperature 12/7°C, outdoor air temperature 35°C.
2. Nominal heating mode: water heat exchanger entering/leaving water temperature 40/45°C, outdoor air temperature 7°C.
3. Water-side heat exchanger fouling factor 0.018m2K/kW.
4. Main power supply: 380V-3Ph-50Hz/415V-3Ph-50Hz/380V-3Ph-60Hz.
Technical requirements:
1. The steel plate for foundation installation shall be provided by the user. For detailed specifications, please refer to the detailed size drawing of the steel plate.
2. Vibration attenuation rubber mats are provided with the machine and should be arranged in the manner as shown in the figure, i.e. 4 rubber mats for each unit.
3. N refers to the total number of modular units installed in the same line, and L is the minimum space between units installed, and L ≥500mm.
4. If the units are to be installed in multiple lines, the minimum space between two adjacent lines should be 1500mm.
5. The unit will generate low vibration. However, poor installation may result in vibration. Please install vibration isolation table or enhance the strength of the installation.
6. In principle, the foundation should form an integral part of the floor. Otherwise, in addition to caculation of the shock resistant degree of installation, it is also required to calculate the shock resistance of the unit + foundation so as to determine the strength during topping or movement.
7. In the case of rainfall or defrosting, water may accumulate, so the foundation should be flat and the floor should have drain holes to drain the water in time.
8. Use a hose when connecting the water pipe.
Pipe ConnectionDiagramNote
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.
Site Installation SchematicWiring DiagramNote:
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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