Rcu-Whyz (-E) Industrial Water Cooled Screw Type High Efficiency Chiller for Large Scale Manufacturing Processes

• Customization: Available
• After-sales Service: Local/Official
• Warranty: One Year
• Model NO.: RCU-WHYZ(-E)
• Type: Water-Cooled
• Cooling Method: Water-cooled
• Unit Structure: Integral
• Selected Voltage: 380V/50HZ
• Compressor Number: 2
• Noise Level: Low
• Application Fields: Plastic
• Application Machine: Precision Machine Tool
• Certification: RoHS, UR, ISO, CE, CCC
• Condition: New
• Whether to Support Customization: Yes
• Electronic Expansion Valve: Optional
• BMS System: Optional
• Outside Full Cover: Optional
• Heat Recovery: Optional
• Transport Package: Wooden Box Packaging and Container Packaging
• Trademark: Hitachi
• Origin: China
• HS Code: 841869
• Production Capacity: 4500unit/Year

Product Description

Detailed Photos

Water-cooled Chillers
The Water-cooled chillers with improved efficiency and functionality by several advanced technology. This series with 
A-type screw compressor that have powerful cooling ability, low noise, low vibration, high efficiency and high reliablility is the perfect answer to all your needs!!
 

Line-up

Type

Refrigerant

Chilled/Hot Water Outlet Temperature

[Capacity class / USRT]

30~

40~

50~

60~

70~

80~

90~

100~

200~

300~

400~

500~

600~

700~

Standard

R22

5~20˚C

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√

√

√

√

√

√

√

√

√

√

√

R407C

5~20˚C

√

√

√

√

√

√

√

√

√

√

√

√

R407C (compact)

5~20˚C

√

√

√

√

√

√

√

√

√

R410A

5~20˚C

√

√

√

√

√

√

√

Heat Recovery

R22

5~20˚C / 35~60˚C

√

√

√

√

√

√

√

√

√

√

√

√

R407C

5~20˚C / 35~60˚C

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√

√

√

√

√

√

√

√

√

√

√

R410A

5~20˚C / 35~60˚C

√

√

√

√

√

√

√

Brine

R22

-20~5˚C

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√

√

√

√

√

√

√

√

√

√

√

R407C

-20~5˚C

√

√

√

√

√

√

√

√

√

√

√

√

R407C (compact)

-20~5˚C

√

√

√

√

√

√

√

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R410A

-20~5˚C

√

√

√

√

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√

High-performance Twin Screw Compressor
The refrigerant gas and oil flow into the oil separator together. The cyclone system begins to separate the refrigerant gas and oil by centrifugal force. Refrigerant gas is ejected from the discharge port, and oil drops down to the bottom tank. Lubrication oil is required for sealing the area between the twoscrew rotors as well as for the lubrication of the bearings, but it decrease the efficiency of air-conditioning units at heat exchangers. The oil and refrigerant are separated by centrifugal force in the cyclone oil separator. After it is compressed by the screw rotors, refrigerant gas enters the upper side of the separator.Refrigerant gas then enters through the lower side of the separator, and the oil is separated by centrifugal forces to the wall of the separator. Oil then goes down to the oil tank along the wall. The oil is accumulated in the oil tank, which is located on the bottom of the separator, and only refrigerant gas is discharged from the discharge port, which is located on the upper side of the separator. The oil that is accumulated in the tank is then supplied to the screw rotors by pressure difference. Unlike other compressor structures, this structure doesn't require mechanical parts such as an oil pump for its oil supply, which leads to higher reliability for the compressor.

Simple Structure with a Small Number of Parts

Whereas the number of main parts for the casing,compression mechanism and capacity control mechanism of a reciprocating compressor is 268, that of a screw compressor is only 27, just one tenth of the number!! A structure with so few parts offers high reliability and easy maintenance.
Operating Principle of The Screw Compressor

	1. Refrigerant is taken in from the inlet port.
	2. The seal line advances toward the discharge side, tooth space is reduced, and compression is performed.
	3.Compression is performed until the seal line of the male and female rotors come to the discharge port, and the pressure is increased.
	4.When the seal line reaches the discharge end, the refrigerant in the tooth space is discharged completely.

Low Vibration
No exclusive vibration control equipment is necessary due to the low-vibration screw compressor.

		Reciprocating	Screw
Comp. speed (rpm) 50/60Hz		1,430/1,720	2,880 / 3,470
Full amplitude	At leg of comp.	20-30	5-8
	At base frame	20	Less than 10
Vib. frequecy	At leg of comp.	23.8 / 28.7	48.5 / 57.8
	At base frame	23.8 / 28.7	48 / 57.8
Acceleration energy		Screw: 1 / 5 of reciprocating type	Screw: 1 / 5 of reciprocating type

High Technology by Internal Manufacture
Because all manufacturing processes, from rotor manufacturing to unit assembly, are done internally, exceptional reliability is achieved.

Continuous Capacity Control
Continuous capacity control is based on the precise control of the chilled water outlet temperature, depending on the temperature requirement of the cooling load.
1. A slide valve within the screw compressor to change the refrigerant circuit variables according to the requested load.
2. An optimized electronic system based on the control band to maintain a constant outlet temperature. 

Continuous capacity control is performed by adjusting the position of the slide valve. The position of the slide valve can be changed freely between 15% to 100%. The electric control system compares the value measured by thermistors with the set value. Depending on the measured value, the control signal instructs the position of the slide valve. When a quick response is needed and the measured temperature is very far from the set point,
the system can be programmed to provide quick control. When precise control is required, the measured temperature is close to the set point, and it can be programmed to give a more precise response ±1°C. Thanks to Hitachi's technical expertise in the twin screw compressor, it is possible to achieve precise water temperature control that is ideal for industrial processes and air conditioning applications.

R410A Chiller
Hitachi was the first in the world to successfully introduce R410A refrigerant in all its products, including air conditioners, package air conditioners and now the SCREW CHILLER. Innovative technology is applied in the design and development of the compressor, refrigerant cycle, and the chiller itself, etc. 

Refrigerant Characteristic Comparison

No.	Refrigerant (Refrigerant Type)	R22 (HCFC)	R134a (HFC)		R410A (HFC)
1	ODP (Ozone Depletion Potential)	0.055	0	O	0	O
2	GWP (Global Warming Potential)	1,700	1,300	O	2,000	×
3	Cooling Capacity	100%	62%	×	140%	O
4	Amount of Refrigerant	100%	161%	×	71%	O
5	GWP x Amount of Refrigerant	1,700	2,093	×	1,420	O

In terms of GWP (Global Warming Potential), R410A is not more environmentally considerate than other refrigerants. However, since the quantity of refrigerant required for equivalent cooling capacity is smaller (see the table), R410A has less impact on the environment than other refrigerants.

Comparison of Chillers Equipped with HITACHI Shell & Tube Heat Exchanger

		Product Weight Comparison(kg)			Cycle Quantity Comparison			Installation Area Comparison (m2)
Refrigerant Type		R410A	R22		R410A	R22		R410A	R22
		A	B	A / B	E	F	E - F	C	D	C / D
Cooling Capacity	200RT Class	3,507	5,452	64%	1	2	-1	3.88	5.04	77%
	250RT Class	3,850	5,584	69%	1	2	-1	3.88	5.04	77%
	270RT Class	3,895	5,716	68%	1	2	-1	3.88	5.04	77%
	400RT Class	7,014	8,574	82%	2	3	-1	8.06	7.66	105%
	450RT Class	7,357	8,834	83%	2	3	-1	8.06	7.66	105%
	500RT Class	7,700	8,964	86%	2	3	-1	8.06	7.66	105%

As shown in the refrigerant aspect comparison above, R410A refrigerant has not only a high cooling capacity per unit, enabling saving of refrigerant, but also less environmental impact than other refrigerants, and it largely contributes to weight-saving of the chiller. Although the operating pressure is larger because the cooling capacity is high, we have succeeded in achieving weight-saving by applying the wealth of technology that we have accumulated through the development of our air conditioners. Moreover, for one-cycle machines, the foundation, transportation, lifting and grounding work required to install the chiller can be reduced because the installation area is greatly decreased.
Compact Heat Recovery Sytem by Using a Plate-type Heat Exchanger
Hitachi' s heat recovery unit consists of a small heat exchanger and is compactly designed. This recovery unit utilizes the energy of making chilled water to supply hot water. Therefore, hot water is supplied for free, and the capacity of the boiler can be reduced. It can supply 60˚C hot water (at 100% operation), and its COP is improved.
This Heat Recovery chiller is suitable for various uses such as Hospital, Restaulant and Hotel.
Setting of Two Temperatures (option)
The temperature setting and water control can be selected according to daytime/nighttime operations or load applications.

Combination	Setting temperature		Capacity control		Command		Applications
	No.1	No.2	No.1	No.2	No.1	No.2
A	Air-conditioning	Air-conditioning	15~100%		RSW setting	7-segment	No.1 for peak time and No.2 for the other times.
B	Air-conditioning	Ice storage	15~100%	0 or 100%	External thermo	External thermo	No.1 for daytime and No.2 for nighttime (Ice storage function).

External Signal Input / Output
Unit operation can be controlled by external singal input and output.

Function
Pump operation control	Chiller and Pump operation are synchronized.
Interlock for Pump	When the pump is not operated, the compressor is also stopped. Therefore, the chilled water side heat exchanger is prevented from freezing.
Interlock for Cooling Tower	When the cooling tower is not operated, the compressor is also stopped. Therefore, the condenser side heat exchanger is prevented from freezing.
Unit start and stop	Remote control for unit start and stop is available.
Pilot Lamp for remote operation	Indicates chiller operation.
Pilot Lamp for remote pump	Indicates pump operation.
Pilot lamp for remote alarm (whole unit or each cycle)	Indicates alarm.

Large Temperature Difference
Save On Initial Equipment Cost
A maximum 10˚C temperature difference is available as standard. This reduces water system volume, pump capacity and piping size.
(Applicable temperature range: 2.5˚C~10˚C)
Heat Exchanger for High Water Pressure (option) 
The heat exchanger for the Hitachi water-cooled chiller withstands 1.0Mpa as standard. In addition, it can withstand 1.6Mpa and 2.0Mpa as an option. This contributes to space-saving and cost-saving, because the water tank size and pump size are reduced.
Brine System (option)
By using brine (antifreeze liquid), it can be used for ice-making and industrial cooling (facility cooling and object cooling) applications. 
Peak Cut Function (option)
Capacity is controlled in accordance with the desired setting (relay input). Therefore it helps to reduce power consumption.
Structure for compulsory control of the capacity for continuous control type. Using a relay contact, the capacity of the compressor can be controlled.
Automatic Recovery from Power Failure (short power cut)
Automatic Recovery from Short Power Cut (standard setting)
During a short power cut, operation is automatically restarted after a 3 minutes time guard.
 Automatic Recovery from Power Failure (selection system by DIP Switch)
If this function is selected, operation is automatically restarted when a 3 minute time guard has elapsed after the power comes on, even if the power failure lasts more than 2 seconds.

Product Parameters

R22 RCU-WHYZ(-E)
Model	40	50	60	80	100	120	140	150	170		180	200	220	260	300	340	380	410	450	490	530	570
Cooling Capacity [USRT]	39.7	48.9	60.4	79.4	97.8	120.9	137.9	146.8	172.9		181.2	190.2	202.8	239.5	276.2	311.1	346.1	377.7	414.4	449.1	484.4	519.1
Cooling Capacity [kW]	140	172	213	279	344	425	485	516	608		637	669	713	842	971	1,094	1,217	1,328	1,457	1,579	1,703	1,825
Net Weight [kg]	1,072	1,142	1,212	1,800	1,980	2,070	2,858	3,010	2,988		3,220	3,038	5,452	5,584	5,716	5,846	5,976	8,442	8,574	8,704	8,834	8.964
Refrigerant Cycle	1	1	1	2	2	2	1	3	1		3	1	2	2	2	2	2	3	3	3	3	3
Dimentions [mm] Height	1,506	1,506	1,506	1,505	1,505	1,505	1,877	1,688	1,877		1,688	1,877	1,810	1,877	1,877	1,877	1,877	1,877	1,877	1,877	1,877	1,877
Width	965	965	965	1,106	1,106	1,106	1,296	1,220	1,296		1,220	1,296	2,692	2,692	2,692	2,692	2,692	4,088	4,088	4,088	4,088	4,088
Depth	1,977	1,977	1,977	2,956	2,956	2,956	2,134	3,531	2,134		3,531	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134

R407C RCUG-WHYZ(-E)
Model	40	50	60	80	100	120	140	150	170		180	200	220	260	300	340	380	410	450	490	530	570
Cooling Capacity [USRT]	37	46.1	56	73.9	92.2	112.1	135.3	138.2	166.3		168.1	183.1	195.7	233.2	270.8	301.8	332.8	368.6	406.1	437.1	468.1	499.1
Cooling Capacity [kW]	130	162	197	260	324	394	476	486	585		591	644	688	820	952	1,061	1,170	1,296	1,428	1,537	1,646	1,755
Net Weight [kg]	1,072	1,142	1,212	1,800	1,980	2,070	2,858	3,010	2,988		3,220	3,038	5,452	5,584	5,716	5,846	5,976	8,442	8,574	8,704	8,834	8.964
Refrigerant Cycle	1	1	1	2	2	2	1	3	1		3	1	2	2	2	2	2	3	3	3	3	3
Dimentions [mm] Height	1,506	1,506	1,506	1,505	1,505	1,505	1,877	1,688	1,877		1,688	1,877	1,810	1,877	1,877	1,877	1,877	1,877	1,877	1,877	1,877	1,877
Width	965	965	965	1,106	1,106	1,106	1,296	1,220	1,296		1,220	1,296	2,692	2,692	2,692	2,692	2,692	4,088	4,088	4,088	4,088	4,088
Depth	1,977	1,977	1,977	2,956	2,956	2,956	2,134	3,531	2,134		3,531	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134	2,134

R407CRCUP-WUZ
Model			34	43	51	67	85	101	128	151	171		202
Cooling Capacity [USRT]		50Hz	33.6	42.7	51.2	67.1	85.3	101	128	150.7	170.6		201.9
		60Hz	37.5	48.3	56.9	75.4	95.3	113.8	145	170.6	190.5		227.5
Cooling Capacity [kW]		50Hz	118	150	180	236	300	355	450	530	600		710
		60Hz	132	170	200	265	335	400	510	600	670		800
Net Weight [kg]			750	765	830	950	1,550	1,650	1,750	2,470	2,550		2,670
Refrigerant Cycle			1	1	1	1	2	2	2	3	3		3
Dimentions [mm]		Height	1,524	1,524	1,524	1,524	1,672	1,672	1,672	1,646	1,646		1,646
		Width	1,225	1,225	1,225	1,400	1,260	1,260	1,260	1,207	1,300		1,300
		Depth	934	934	934	934	1,661	1,661	1,661	2,466	2,466		2,466

R410ARCUA-WHYZ(-E)
Model			160	180	220	240	280	300	380	440	500		560	600	660	720	780	840	900
Cooling Capacity [USRT]			147.6	162.4	200.2	220.4	251.4	276	347.8	400	451.6		502.8	553	600.6	651.8	703	754.2	829.1
Cooling Capacity [kW]			519	571	704	775	884	972	1,223	1,408	1,588		1,768	1,944	2,112	2,292	2,473	2,653	2,916
Net Weight [kg]			3,082	3,122	3,507	3,547	3,850	3,895	6,589	7,014	7,357		7,700	7,790	10,521	10,864	11,207	11,550	11,685
Refrigerant Cycle			1	1	1	1	1	1	2	2	2		2	2	3	3	3	3	3
Dimentions [mm]		Height	1,900	1,900	1,900	1,900	1,900	1,900	1,900	1,900	1,900		1,900	1,900	1,900	1,900	1,900	1,900	1,900
		Width	1,285	1,285	1,285	1,285	1,285	1,285	2,670	2,670	2,670		2,670	2,670	4,055	4,055	4,055	4,055	4,055
		Depth	3,104	3,104	3,104	3,104	3,104	3,104	3,104	3,104	3,104		3,104	3,104	3,104	3,104	3,104	3,104	3,104

Temperature Conditions

Chilled water outlet temperature	7˚C
Chilled water inlet temperature	12˚C
Condenser water inlet temperature	30˚C
Condenser water outlet temperature	35˚C

Working Range

	RCU-WHYZ	RCUG-WHYZ	RCUP-WUZ	RCUA-WHYZ
Condenser water outlet temperature (˚C)	22 ~ 40	22 ~ 37	22 ~ 37	22 ~ 37
Chilled water outlet temperature (˚C)	5 ~ 20	5 ~ 20	5 ~ 20	5 ~ 20
Main power supply (3 phase)	380V 50Hz	380V 50Hz	380V 50Hz	380V 50Hz
	415V 50Hz	415V 50Hz	415V 50Hz	415V 50Hz
Control power supply (1 phase)	220V 50Hz	220V 50Hz	220V 50Hz	220V 50Hz
	240V 50Hz	240V 50Hz	240V 50Hz	240V 50Hz
Standard	GB/T 18430.1-2007	GB/T 18430.1-2007	JIS B 8613	GB/T 18430.1-2007

Our Advantages

Company Profile

Huantai Electromechanical Equipment Co., Ltd. is a first tier agent and maintenance provider of Hitachi chillers (ice water units) established by Hitachi Group in China.
Our main product include: Water cooled screw chillers, Air cooled screw chillers, Scroll type air cooled water chillers, scroll type water cooled chillers, glycol chillers, low temperature industrial chillers, cooling tower, pumps and etc professional refrigeration equipment. Widely used in Plastic injection, Extrusion, Blow molding, Brewing, Chemical, Pharmaceuticals, Food process, Dairy Process, Beverage, Concrete mixer, CNC, Laser and etc field. Hitachi chillers are exported to America, Europe, Southeast Asia, the Middle East, Africa and other regions and countries, have won unanimous praise from our users. As the sales representative of Hitachi Group in the field of central air conditioning and chillers in China, we have grown into a professional Hitachi chiller sales enterprise. Our company′s products are based on Hitachi technology, especially the heart of the chiller system - the compressor, which uses Hitachi vortex, screw, and large centrifugal compressors developed with unique Hitachi technology. We continuously provide customers with various advanced products known for high reliability, energy saving, and environmental protection.
"Quality first, technological innovation" is our product concept, which requires us to be extremely responsible to customers, with zero tolerance for product defects, and requires us to focus on product optimization. We believe that by adhering to the business philosophy of "quality for survival, service for development" to build the company into a strong enterprise in the industrial refrigeration industry!
Huantai and Hitachi chillers (B2B strategic partner)
Since its establishment, the company has focused on the sales of complete machines (Sale), spare parts (Sparepart), after-sales service (Service), and information feedback (Survey) of Hitachi chillers, and provided 24-hour uninterrupted service response. It is an important strategic partner of Hitachi chillers that integrates product agency stocking, channel development, information exchange, and the only 4S standard service.
In the future, we will continue to uphold Hitachi′s "harmony, " "sincerity, " and "pioneering spirit, " and continue to work hard.

Exhibition display

Certifications

Packaging & Shipping

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.

FAQ

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.