Air Cooled Screw Chiller

Air Cooled Screw Chiller

  • Chiller cooling capacity from 30Ton to 550Ton
  • Semi-hermetic screw type compressor
  • Air-cooled type condenser
  • Temperature control from 7℃to 35℃
  • Closed loop shell and tube evaporator
  • No need to install a cooling tower

Your Premier Air Cooled Screw Chiller Manufacturer

As a leading air cooled screw chiller supplier, TopChiller provides a complete range of air-cooled screw chiller from TPAS-ASH series, with cooling capacity from 50Ton to 580Ton/130KW to 1950KW and the chiller temperature control range is +30℃ to -30℃.

Besides the standard air-cooled screw chiller control temperature of 7℃ to 30℃, TopChiller also has air-cooled glycol screw chiller control temperature below zero from 0℃ to -30℃.

Each air cooled screw chiller designed from TopChiller has the following features:

Using world famous brand semi-hermetic screw compressor- Bitzer from Germany and Handbell from Taiwan.

Each screw compressor with 4 steps of energy control 25%-50%-75%-100% to make sure the whole screw chiller is stable and guarantee high refrigeration performance.

There are also 2 or 3 compressors for optional depends on the required refrigeration capacity.

Highly efficient closed-loop shell and tube type heat exchanger as the evaporator, and using air-cooled type condenser-copper tube sleeve aluminum fin with big volume air cooling fan.

Integrated PLC control system with human-computer interface and big LED touch screen panel for easy operation and troubleshooting.

World-famous refrigeration spare parts like Danfoss brand thermal expansion valve, Alco dryer filter, Schneider electrical contractor, and overload relay will make sure the whole air cooled screw chiller works under normal conditions.

The above original quality refrigeration spare parts will ensure each air-cooled screw chiller at a steady running condition.

TopChiller has exported various air-cooled screw chillers cooling capacity from 85Ton,100Ton,120Ton and 180Ton to 550Ton the Philippines, Australia, New Zealand, Malaysia, Singapore, Indonesia, Chile, Mexico, Costa Rica, Brazil, Argentina, Colombia, South Africa, Nigeria, Saudi Arabia, Dubai, Spain, Italy, etc.

As a leader of air-cooled screw chiller supplier, TopChiller can provide not only standard configuration chillers but some other customized products.

Please contact TopChiller sales to get the best water cooling solution of your air-cooled screw chiller.

Air Cooled Screw Chiller Technical Specifications

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air cooled screw chiller

Chillers Related With Air Cooled Screw Chiller

  • Air Cooled Screw Chiller
  • Air Cooled Screw Chiller
  • Water Cooled Screw Chiller
  • Central Chiller

TopChiller: Your Professional Air Cooled Screw Chiller Supplier

Air cooled screw chiller equip with semi-hermetic screw compressor, also called air cooled screw compressor chiller. It is for large cooling capacity applications.

Each air cooled screw chiller manufactured by TopChiller featuring full protection devices including screw compressor overheating protection, low-temperature protection, high/low pressure, anti-freezing, phase-missing, anti-phase with overload, water flow switch and startup latency.

Various refrigerants such as R134a, R407c, R410a, and R404a are all available depending on the screw chiller working condition, application requirements and ambient temperature.

Air Cooled Screw Chiller

Air Cooled Screw Chiller

Besides the above features, all air cooled screw chillers designed and manufactured by TopChiller also have an optional function for special requirements including soft-starting, economizer for higher efficiency.

Each air cooled screw chiller with complete stainless steel nonferrous chilled water circuit for high water quality requirement, electronic expansion valve and remote control for monitoring the screw chiller working status.

As we all know screw type air chillers playing very significant roles.

Most air cooled screw chillers are widely used for various industries applications such as HAVC, big building&hotel air conditioning, central chilled water supply, chemical processing, die casting,food&beverage processing, pet food, pharmaceutical, plastic processing, automotive, energy&power project, packing, and printing.

Based on the required chillers cooling capacity or refrigeration capacity, we have one screw compressor chiller and dual compressors chiller for your optional:

air cooled chiller with dual compressors working diagram

As a professional air cooled screw chiller manufacturer, TopChiller aims to provide air cooled screw chiller with stable quality, operation efficiency, and energy savings.

It is suitable for air conditioning applications, industry-type process cooling, and large-scale district heat source systems.

Helpful Resources To Know More About Air Cooled Screw Chillers

What Is Air Cooled Screw Chiller?

Air cooled screw chillers are a water cooling system in which air is used to cool the temperature of the device and improve the production efficiency of the machines.

As there is no need to install a complicated water cooling system and it’s easy to install and highly efficient, air cooled screw chillers are more environmentally friendly compared to other kinds of chillers.

Air Cooled Screw Chiller

Air Cooled Screw Chiller

Nowadays, more and more companies are paying attention to energy conversation in their business production so air cooled screw chillers have played a key role in cost savings.

In the marketplace where all kinds of chillers can be found, air cooled screw chillers are widely accepted and popular in factories, shopping malls, hotels, office buildings, and other public places that are in need of cooling systems.

Air Cooled Screw Chiller

Air Cooled Screw Chiller

How Does an Air Cooled Screw Chiller Work?

Air cooled screw chiller earned its name for being equipped with a screw compressor.

The working principle of an air-cooled chiller with screw compressor is like this:

The screw compressor will release high temperature, high-pressure gas into finned tube condenser, then this air cooled condenser will condensed refrigerant liquid will flow into a component named liquid container.

The high-pressure liquid coming from the liquid container will be cooled by the heat exchanger in the gas-liquid separator.

After that, the liquid continues to go through the expansion valve and enters the shell and tube evaporator to get cooled and turn into refrigerant vapor featured by low temperature and low pressure.

Air Cooled Screw Chiller Working Principle

Air Cooled Screw Chiller Working Principle

When the refrigerant vapor enters the gas-liquid separator again, the refrigerant gas after being separated will be sucked into the compressor.

It might be easier to understand its basic idea if we follow the refrigerant alone to look at where it flows and how the process completes a cycle:

The refrigerant vapor is sucked in and compressed by the compressor, and then is released to the condenser where it’s condensed into a refrigerant liquid.

Afterward, it will pass through the expansion valve into the evaporator to get vapored. The refrigerant vapor will go back to the compressor again for the next cycle.

Air-Cooled-Screw-Water-Chiller-Work

Now let’s take the whole air cooled screw chiller apart and look at its key components closely.

Key Components of an Air Cooled Screw Chiller

Before this article, let’s have a look at below air cooled screw chiller video we finished in TopChiller factory. you will get a general idea about this kind of air cooled screw chiller.

1. Screw Compressor
For air cooled screw chiller, we are using Hanbell brand or Bitzer brand semi-hermetic screw type compressors.

This type of screw compressor is most crucial among all components in an air-cooled screw chiller as it works as an engine in a vehicle.

The role of the screw compressor is to compress the low pressure, low-temperature gas into a high pressure, high-temperature gas, and then transfer the gas into the finned tube condenser.Hanbell Screw Compressor

Hanbell Semi-hermetic Screw Compressor

A screw compressor is a type of rotary compressor that consists of one or two screws.

The advantage of a screw compressor is that is can compress air by screw action and compress it continuously and stable.

TopChiller® air cooled screw chillers are featured by semi-hermetic double screw compressors. Each compressor is highly efficient and can be managed by the unit controller to modulate the capacity.

Bitzer Screw Compressor

Bitzer Semi-Hermetic Screw Compressor

2. Oil Separator
A certain amount of oil will be released when the compressor compresses the refrigerant.

After the oil leaves the compressor, it will circulate throughout cooling components and hinder heat transfer and even reduce the capacity of the evaporator and condenser.

Oil Separator for Chiller

The oil separator is to make the oil disconnected from the refrigerant, which can minimize the amount of oil flowing in the cooling system.

Therefore, it is particularly important to prevent oil from getting more and more in the chiller.

Oil separators in TopChillerr® air cooled screw chillers are smaller in size and fewer moving parts, which make them more effective in the removal of oils in the refrigerant and also lower in terms of failure rates.

A double screw compressor integrated with an oil separator maximizes the efficiency of the air-cooled screw chiller.

Oil Separator for Chiller

Oil separator

3. Evaporator

For air cooled screw chiller, we are using closed shell and tube type heat exchanger.

The shell and tube evaporator is designed to collect the waste heat from the outside and transfer it into the refrigerant.

The cooling process begins with the evaporator, whose tubes contain some kind of liquid refrigerant.

In a shell-and-tube evaporator, the liquid refrigerant at low pressure enters the shell and flows through the tubes, absorbing heat from higher-temperature water that flows through the tubes.

When the water has reached a particular temperature, it will send the heat back to the refrigerant in the evaporator and get evaporated.

In the meantime, the water temperature cools down when the heat is extracted by the refrigerant.

Generally, the evaporator is installed between the compressor and the expansion valve.

At TopChiller®, air cooled screw chillers are equipped with shell and tube heat exchanger, these high-performance shell&tube evaporator having some advantage:

  • New grooved tubes geometry
  • Delta T up to 10℃
  • Optimized for variable flow operation

All are selected for R22, R407c, R134a, R404A refrigerants and many other applications.

Shell and Tube Evaporator

Shell and tube evaporator

4. Condenser

Condensers in air-cooled screw chillers are able to harness the air around to cool down the hot refrigerant which flows through the tubes.

In a typical air-cooled screw chiller, the condenser will condense the hot, high-pressure refrigerant vapor flowing through the tubes to a liquid.

Air Cooled Condenser

Air Cooled Condenser

Then the condenser is used to lower the temperature of the refrigerant below the saturated condensing temperature, which enhances the refrigeration effect and improves system capacity eventually.

The condenser coils are usually made of copper tubes and aluminum fins and are assembled in the form of W to offer a larger heat exchange surface.

TopChiller is always using the last generation of microchannel condensing coils. They are features below advantages:

  •  Long service life aluminum alloy
  • Reduced refrigerant charge
  • Several coating options available

Air Cooled Condenser

Air Cooled Condenser

5. Expansion Valve

Expansion valves expand the refrigerant before it enters the evaporator.

Air cooled screw chillers usually use either electronic expansion valves (EXV) or thermostatic expansion valves (TXV).

Danfoss Expansion Valve

Thermal Expansion Valve

TXV is very common and it has one side attached to the pressure of the refrigerant and the other side is connected to the sensing bulb, which is installed near the outlet of the evaporator

The expansion valve reduces the pressure of the liquid refrigerant, which makes the liquid temperature getting lower.

Thermal Expansion Valve

Thermal Expansion Valve

The heat molecules inside the refrigerant are able to spread out when the refrigerant leaves the orifice of the expansion valve.

The liquid refrigerant gets cold under a massively reduced pressure and it will get access to the evaporator after leaving the expansion valve.

Expansion Valve

Thermal Expansion Valve

6. Cooling fan

Each air cooled screw chiller with 6 units to 22 units air cooling fans. These cooling fans play a very important role to spread boring heat out when air cooled screw chiller working.

These high-performance fans with below advantages:

  • Increasing the overall installation efficiency
  • Available static pressure up to 200Pa
  • Variable speed brushless motor available as an option

The Difference Between Air Cooled Screw Chiller and Water Cooled Screw Chiller

Both air-cooled screw chiller and water cooled screw chiller are composed of a compressor, an evaporator, a condenser, and an expansion valve.

They work under similar principles to finish the heat transfer but they use different components to cool the condensers.

Water cooled screw chillers use water consumption whereas air cooled screw chillers need air ventilation.

As mentioned above, when a chiller comes with a screw compressor, it will be named a screw chiller.

Therefore, there are screw compressors for both kinds of chillers. However, the air-cooled screw chiller is noteworthy as it has the following advantages compared to water-cooled screw chiller.

1. Smaller Occupation Area

When we take an air-cooled screw chiller alone, it is bigger in size than a water-cooled screw chiller.

However, a water-cooled screw chiller requires to install a cooling tower, pumps and other necessary components, which will make the whole set of a water-cooled chiller take up more space.

And as a result, air-cooled screw chiller requires a smaller area of occupation.

Air Cooled Screw Chiller Installation

2. Easier Operating System

As there is no need for a water cooling system, air cooled screw chillers actually have simplified the cooling system.

What’s more, the company managers do not need to hire workers to install the cooling tower, pumps, and pipes.

In a society where labor costs are getting higher, it’s a key issue to keep the daily maintenance and repair costs running low.

Without the components in water chillers, air cooled screw chillers will bring the companies to cost savings on the labor.

Air Cooled Screw Chiller VS Water Cooled Screw Chiller

3. Less Impact on Building Appearance

For most of the water cooled chillers, a cooling tower is a must for water cooling system.

The cooling tower is often installed inside the building, which not only creates a negative impact on the building’s appearance but also is disharmonious with other objects on site.

Architects oftentimes are opposed to the use of cooling towers, as they think cooling towers are doing harm to the atmosphere inside the construction.

Air cooled screw chiller, instead, generally will not exceed 3 meters in height and much shorter than a cooling tower.

This is why air cooled screw chillers are more popular in constructions where appearance is a key factor for the business.

Air Cooled Screw Chiller and Water Cooled Screw Chiller

Air Cooled Screw Chiller VS Water Cooled Screw Chiller

4. Lower Cost on On-Going Maintenance

Water cooled screw chillers are less expensive than air cooled screw chillers in terms of the product cost and the operating expenses.

However, when it comes to expenses on cooling towers, water pumps, pipes, and water processing, etc.,

the investment on water-cooled screw chillers will bring fewer benefits than air cooled screw chillers in the long run.

Cost of Air Chiller and Water Chiller

Let’s have a deep look at the difference between air cooled screw chiller and water cooled screw chiller:

1. The air cooled screw chiller and water cooled screw chiller structures comparison

The air-cooled screw chiller unit adopts air cooling mode (fan cooling); the water cooling chiller unit adopts cooling water cooling mode, and the water pump plus cooling tower and circulating pipeline cools the unit.

From the perspective of water-cooled installation, it can be divided into two types: built-in water cooling and external water cooling.

For the built-in water cooling, it is mainly composed of a radiator, a water pipe, a water pump, and a sufficient water source, which is destined that most of the water-cooling heat dissipation system has a large volume and requires a sufficient space inside the chassis.

Therefore, the air-cooled screw chiller unit only needs an air-cooled condenser or a fan.

Water-cooled screw chillers need to be equipped with cooling towers, pumps and circulation lines. Water cooled type from the structure is more complicated than air cooled type.

The air-cooled screw chiller is suitable for areas where the water source is located in a tight area.

It is more advantageous to use an air-cooled chiller unit for a refrigeration system with longer annual operating hours.

Air Cooled Screw Chiller

The annual comprehensive cost of the air-cooled refrigeration unit is lower than that of the water cooling system.

However, if the water cooling system is managed and the water supply is controlled below 3%, the annual cost of the water-cooled screw is lower than that of the air-cooled screw chiller.

2.Advantages and disadvantages of water cooled and air cooled screw chiller

Disadvantages of water-cooling chiller:

For open-type cooling circulating water system, since the cooling water absorbs heat, it is in contact with air, CO2 escapes into the air, and dissolved oxygen and turbidity increase in the water, causing four major problems in the cooling circulating water system: corrosion, knot Scale, algae breeding and sludge.

If the water quality is not treated, the refrigeration equipment will be seriously damaged, and the heat exchange efficiency will be greatly reduced, resulting in a waste of energy.

Therefore, it is very important to carry out corrosion inhibition, scale inhibition, sterilization and algae treatment on the system water.

Air Cooled Screw Chiller

Disadvantages of air-cooled screw chiller:

The air-cooling chiller unit’s cooling capacity is slightly higher than that of the water-cooled unit, but the annual comprehensive cost of the air-cooled unit is slightly lower than that of the water-cooled chiller unit.

The results of the technical and economic analysis show that it is reasonable to configure air-cooled condensers for medium and small chiller units.

The longer the annual running time of the chiller unit, the more favorable it is to adopt air-cooled screw chiller.

For a summary, The initial investment of air-cooled screw chiller is relatively high, and the power consumption per unit of refrigeration capacity is also slightly higher than that of water-cooled units.

However, the annual comprehensive cost of air-cooled screw chiller is basically the same as that of water-cooled units.

The longer the annual running time of the chiller, the more favorable it is to the air-cooled unit.

The initial investment recovery period of the air-cooled screw chiller compared with the water-cooled screw chiller is shorter.

The amount of water replenishment of the water cooled screw chiller is an important factor affecting its cost.

Strengthening maintenance management and reducing water consumption are important aspects of reducing the cost of water-cooled screw chiller.

Industrial Applications of Air Cooled Screw Chiller

Air cooled screw chillers are very popular refrigeration equipment that can provide steady and reliable water cooling sources for both industrial and commercial usage.

For air cooled screw chillers used in a variety of industries for process cooling and here are some typical examples of how they can be helpful for the production.

Air Cooled Screw Chiller Application and Installation

1.Printing

The printing industry involves a variety of products ranging from newspapers, postcards, to packaging goods.

There are many products that can be found in our daily life when it comes to paper products. Digital printing, an already thriving sector of the market and there is growing momentum for this industry.

Air Cooled Screw Chiller

Digital printing refers to the process of printing from a digital-based image directly to another type of media.

A picture, document or another kind of digital format is received from a personal computer and then sent to a printing device where it’s processed and placed on any desired material.

TopChiller® air cooled screw chillers have been serving the printing industry for years.

In the printing industry, chillers are used to dissipate the heat created by the heated printing rollers in the process of friction.

Air cooled screw chillers are also able to cool the paper when it comes out of the ink drying ovens.

Air cooled screw chillers can help companies save costs as they can be used to control temperatures in presses and rollers to reduce the chances of stretching and bleeding.

In doing so, the production time is reduced and the manufacturer will be able to produce more printed products every day and achieve more profits.

Air Cooled Screw Chiller for Printing Press
Air Cooled Screw Chiller for Printing Press

2. Cement Cooling

Cement is usually mixed with water to form the material known as concrete whose temperature is to a great extent determined by the water used in the chemical combination of cement aggregates and water.

Most of the application is for batching plant and other cement plants.

In the meantime, water gets more quickly evaporated at higher temperatures and if the temperature of the concrete is too high, more water will be evaporated.

Therefore, the concrete cooling is required to cool the water before the hydration.

TopChiller® air cooled screw chillers are the perfect choice to regulate the temperatures of the concrete and ensure that problems will not arise from hot concrete.

Cement Plant Chiller

Cement Plant Chiller

Temperature-controlled concrete is required for the large-volume pouring of viaducts.

Large hydropower dams, nuclear power, and high-rise building foundations.

During the concrete mixing process, the internal volume of the concrete hydration heat increases, especially the heat generated by the stirring under high temperature conditions is higher.

In the subsequent curing or low temperature, the interior of the concrete will be caused by thermal expansion and contraction.

The volume is reduced, and cracks usually occur in this process.

Therefore, the initial pouring temperature of the concrete should be low, reaching the limit temperature of the building design unit, thus ensuring the quality of the project.

Coldwater from air cooled screw chiller is used in the construction to cool the concrete.

3. Plasma Cutting

Plasma cutting is used on different kinds of materials such as aluminum and stainless steel.

In the plasma cutting, the plasma cutting torch is a big heat source as it’s usually the power leads, which contained a metal cable inside and the cable can conduct a great amount of electrical current.

A lot of heat will be generated and the heat has to be removed to prevent the hoses from melting.

The air cooled screw chillers supplied by TopChiller® are a suitable water cooling partner for plasma cutting machines.

Air cooled screw chiller can control the temperatures of the production devices and keep the cutter at the required temperature all the time to secure the quality of the products coming out of the machines.

infographic plasma cooling water chiller

infographic plasma water cooling chiller

4. Plastic machinery

Air cooled screw chillers are also widely used in plastic processing and plastic machinery including: plastic injection molding, plastic extruders, and extrusion line, blowing molding machine.

The function using air cooled screw chiller is to provide the cooling water flow rate for cool the plastic mold temperature down to make sure the product quality and production efficiency.

TECHNICAL, INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

1.SUMMARY
Air Cooled Screw Chillers are the products developed by Shenzhen Topchiller Co. Ltd.

These series products adopt Bitzer brand semi-hermetic screw type compressor, famous refrigeration parts, and electrical control elements from the world.

These series chillers have features of impact design, reliable control systems, economical and flexible installation.

The computer control system increases precision and reliability. It may regulate energy multi-steps to make output cooling energy to best match practical running load.

Therefore this air cooled screw chiller runs in the best economical state. Pre-set operating mode and program realize the air cooled screw chiller to run in energy-saving all the time.

The computer may also connect the network system to realize building management control automatically.

Air-cooled integrity structure saves the cooling tower and reduces construction investment.

It is suitable for various hotels, shopping centers, and office buildings central air conditioning system and textile industrial, chemical industrial, metallurgy industrial, pharmacy and electrical power, etc.

2.WORKING PRINCIPLE AND TECHNICAL DATA IN COOLING SYSTEM

2.1 WORKING PRINCIPLE OF AIR-COOLED WATER CHILLER
Cooling circulating compressor absorbs low-pressure, over-heated refrigerant gasify from dry type evaporator and changes the refrigerant into high-temperature.

High-pressure, over-heated refrigerant gasify, and radiates heat energy into ambient, then refrigerant is condensed into the liquid status and passes by the expansion valve.

After throttling refrigerant drops pressure, then goes into dry type evaporator to absorb heat energy and is absorbed by compressor again to finish one circulation.

Cooling system working principle of series air-cooled screw water chiller shows as Appendix:

Air-cooled screw chiller is an integrity structure with modular structure design, condenser upside-down M layout.

The screw compressor, dry type evaporator, receiver, cooling pipes, and accessories arrange on steel foundation uniform.

The electrical control box is at one end of the unit, the flange connector for refrigerant inlet locates the side of the machine.

The shell of the air cooled screw is made of high strength pained steel plate with a nice look and long service life. Please note the air cooled screw chiller is suitable for outdoor installation on atrocious weather.

The side of the unit has high/low-pressure meters, a semi-piston type compressor has an oil-pressure gauge.

2.2THE FEATURES OF AIR-COOLED SCREW TYPE WATER CHILLER

2.2.1Wide capacity range:
1)The various type unit with a range of cooling capacities from 180KW – 1730KW;

2)Each one has cooling only and cooling (heating) type;

3)There are integrity and optional modular structure;

4)Each air cooled screw chiller circuit has a regular computer control type and luxury computer control type;

5)Provide optional components of the auxiliary electrical heater, build-in water pump, and paddle flow switch, etc. according to customer requirements.

6)The air cooled screw chiller may use no-standard refrigerant. It may be low water temperature type glycol for air-cooled screw chiller, or double refrigerant unit, air-cooled compress condensing unit, etc. Please contact us for details.

2.2.2The air cooled screw chiller has high efficiency, less energy consumption, and low operating fee features.

TopChiller imports brand high EER semi-hermetic crew type compressor ( Hanbell or Fusheng as standard), Bitzer from Germany are also available. Condenser, and cooling accessories from the world and adopt advanced technology in air conditioning and control.

High-quality process equipment and testing-center to ensure the air cooled screw chiller has energy-saving and reliable features.

2.2.3Air cooled screw chiller protection components
The air cooled screw chillers have thermal protection switch, overload relay, high/low-pressure switch, paddle flow switch, and delay-starting protection devices to ensure the unit runs under safety, reliable working condition and unit are easy to maintain and repair.

2.2.4Optional modular design
Multi-modular air cooled screw chillers adopt module combined structure to increase the screw chiller’s flexibility in transportation, installation, adjustment and maintenance and reduce the fee for transportation, installation and air cooled screw chiller maintenance.

2.2.5Super low noise, operating quietly. And optional low noise cabinet for screw compressor
1)A semi-hermetic screw compressor has operating steady, low noise, and fewer vibration features.

2)A brand condensing axial fan is used in the unit. The blades and exterior-rotor motor design integrally. The unit structure is simple with good air dynamic features and to ensure fan works under low noise and high efficiency.

2.2.6 Advance control system, steady quality, and reliable features.
1)Micro-computer control intelligently, English display, and friendly interface. Operating information is clear at a glance.

2)High automatic management with complete features to realize unit start-up and shut down, timing control, water pump control, malfunction alarm and self-diagnosis features.

Air cooled screw chiller has an optional RS485/RS232 communication port and convenience for centralizing controlling and lone distance monitoring and long-distance control.

3)Micro-computer and electrical control elements are brand products and imported from the world. The air cooled screw chiller has good quality and reliable features.

4)Micro-computer controller defrosts intelligently with accuracy and efficiency.

The controller of air cooled screw chiller also has self-diagnosis, energy management; anti-freeze and operating mode automatically control abilities.

The air cooled screw chiller has protections of high/low pressure, anti-freeze, oil temperature, overload, phase sequence, and water lacking to ensure unit run safety.

2.2.7Nice outline
1)Air-cooled condenser with upside-down M shape layout to improve space using ratio, heat exchange area of air-cooled condenser and to reduce the unit overall size.

2)The components and system pipes layout reasonable.

3)The shell of the air cooled screw chiller pained with statically treatment.

The color of the shell may design by the customer when the order is placed. The stainless steel plate is also available for the shell.

2.2.8Save outdoor space.
1)The air cooled screw chiller may install on the roof of the building, ground or other location, where does not need the equipment room.

2)This air cooled scerw chiller uses a highly efficient heat exchanger. It adopts outdoor structure design and system matching with small volume, lightweight, and less area occupied.

2.2.9Easy to maintenance
1)The installation of the air cooled screw chiller is flexible. It can control at the job site and long-distance

2)Open type structure is a convenience for maintenance and reduces service space.

2.3TECHNICAL DESCRIPTION

2.3.1Refrigerant: R22/R134a/R407c

2.3.2Nominal cooling working condition:
1)Condenser inlet temperature DB 35 ℃, WD 24 ℃.
2)Evaporator inlet temperature 12℃, outlet temperature 7 ℃

2.3.3Nominal heating working condition:
1)Condenser inlet temperature DB 7 ℃, WD 6 ℃.
2)Evaporator inlet temperature 40℃, outlet temperature 45 ℃

2.3.4Fin type air-cooled condenser
1)Fin type air-cooled condenser adopts imported high purely, seamless screw thread copper and special aluminum fin after mechanical expanding joint closely. It ensures fin type condenser work in the best efficiency.

2.3.5Tube in tube type evaporator
1)It is a tube in tube structure with newly developed fire-proof and water-proof material as heat preservation. The water-side working pressure may reach to 2.0 MPa.
2)There is PVC engineering plastic breakwater inside of the evaporator with strong anti-corrosion ability. Chilling water circuitous goes up and down to increase tumble effect, and heat exchangeability.
3)Adopt new technology DAC weave interior screw threat, high efficient heat exchange tube to ensure good cooling characters.

2.3.6Semi-hermetic screw compressor
The unit uses an imported semi-hermetic screw type compressor. Comparing piston and scroll type compressors, the semi-hermetic screw type compressor has the following advantages:
1)Fewer accessories (Approximately 1/3 of piston compressor). The unit structure is a simple and long service life).
2)The unit EER ≥3.1W/W;
3)Screw type compressor may adjust the energy in the range of 25% – 100%. this is for energy-saving consideration

2.3.7Four-way valve
TopChiller air-cooled screw chiller adopts a famous four-way valve-like PE, so that solves reversing and system consume great problem exists in other same kinds of products.

2.3.8Condenser
1)Axial fan, protection grade reached IP55. long service ling and reliable.
2)External rotator and blades combined into integrity. Design compact, run in high speed and low noise.

2.3.9 Optional Heat recovery functions for free-living hot water
1) Partial heat recovery for free hot water.
2) Total heat recovery with multi-functions, and could be controlled.

FOULING FACTOR CORRECTION COEFFICIENT

FOULING FACTOR CORRECTION COEFFICIENT

F1 – F2 = Energy correction coefficient
FP1 – FP2 = Compressor power input correction coefficient
The performance data given refer to conditions with clean heat exchangers (fouling factor =1).

For different fouling factors, unit performances should be corrected with the correction factors shown above.

OPEARTING RANGE

OPERATING RANGE

ETHYLENE GLYCOL SOLUTIONS
The use of ethylene glycol mixtures is intended to prevent freezing in chiller heat exchangers. The use of low freezing point mixtures causes a modification in the main thermodynamic properties of the units.

The major parameters affected by the use of glycol mixtures are the following:

Cooling capacity
Power input
Mixture flow
Pressure drop
In the table below is reported correction factors referred to the most common ethylene glycol mixtures.

ETHYLENE GLYCOL SOLUTIONS

ETHYLENE GLYCOL SOLUTIONS

CALCULATION EXAMPLE
An example can help to use properly the coefficients reported in the table.
Suppose that a single water chiller presents the following performances at the nominal working conditions:

With a 30% glycol mixture these parameters will change to the following values, according to the correction factors:

LOW TEMPERATURES CORRECTIONS FACTORS

LOW TEMPERATURES CORRECTIONS FACTORS

CALCULATION EXAMPLE
Suppose that for a single unit performances should be required at the following conditions:
– Evap. in/out water temperature: 0/-4 °C
– Glycol: 30%
– Ambient temperature: 35 °C
For such a unit nominal performance (inlet/outlet water temp. 12/7 °C, ambient temperature 35 °C) are:
Cooling capacity: 184.9kW
Input power: 58.4 kW

Performances at the required conditions can be calculated as follows:
1st step:
Performances are calculated without taking into account the use of glycol mixtures.
Cooling capacity: 184.9×0.459 = 84.87kW
Input power: 58.4×0.774 = 45.2 kW

2nd step:
The use of glycol mixtures is taken into account (please refer to glycol correction factor tables). In our case we have (30% glycol):
Cooling capacity: 84.87x 0.973 =82.58kW
Input power: 45.2×0.990 = 44.75 kW

5. Air Cooled Screw Chiller Dimension and foundation size recommended

6.ELECTRICAL CONTROL SYSTEM THEORY
The electrical control system controls the cooling system by the thermal sensor.

Electrical protection devices and alarm systems act to monitor, protect, and alarm.
Electrical control system sees electrical drawing and <electrical manual for users>
System wiring refers to wiring suggestions (Appendix 2) for detail.

7.INSTALLATION REQUIREMENT
In order to act safely and avoid malfunction occur, air cooled screw chiller installation must be implemented by an experienced technician and carefully read the manual before installation.

7.1CHECK AND ACCEPT
After arriving, the user should check the air cooled screw chillers as following documents

7.1.1 Random check if the package has documents below.
a. Certification. b. User manual. c. Warranty card. d. Package list

7.1.2Check the model, specifications, and accessories according to the packing list.

7.1.3Check if there is any damage or any missing accessories.

7.1.4Check if refrigerant leaks.
If there is any problem or question of your air cooled screw chiller, please contact TopChiller or agent right now, therefore the problem can be fixed as soon as possible.
Note: Please don‘t open the package of the unit until installation avoiding your screw chiller damaged.

7.2TRANSPORTATION
Every air cooled screw chiller passed strictly inspection and testing to ensure performance and quality.

The user has to pay attention to handling the air cooled screw to avoid damage caused by installation and transportation.

We advise the air cooled screw chiller should be placed in the location where near the installing destination before unpackaged it. This air cooled screw chiller should be placed upward, then transit unpackaged accessories.

7.2.1Lift hook
The air cooled screw chiller has to be handled by a professional logistic company.

The handling method recommends below: Using two slings on the top of this screw chiller to support the steel cable preventing panel damaged.

The intensity of steel cable must be 3-times intensity more than the total weight of the unit. It doesn’t allow anyone to stay under the unit during the lift hook.

The weight of the air cooled screw chiller is on the nameplate.

Please refer to the figure below for the handling method.

7.1.2Installation
1)Location and foundation (Foundation drawing as above)
The air cooled chiller is an outdoor installation. It should be installed on the level up to roof, ground, or other available places.

The foundation supporting should be two parallel U-steel or I-steel and installed on a flat base.

2)The space for maintenance and ventilation
This air cooled screw chiller should have good ventilation. The minimum distance between objects should be equal to or greater than 1.5 meters.

Herringbone shed May be built up 2 meters high from the highest point of the unit if it allows.

7.3COOLING WATER SYSTEM (REFER APPENDIX III)
Each jointer of the pipe has a label. Please connect it according to the label.

7.3.1All pipes have to place jointer or flanges to the location where nearest the unit, so that uninstall easily when necessary.

7.3.2The connector of the cooling water inlet and outlet should use vibration absorbs connector to avoid the machine’s vibration and pipe system damaged.

7.3.3Water pipe system should install a paddle flow switch and interlock with compressor control to ensure enough water flow.

7.3.4Turn on cooling water inlet/outlet valve and check if there is any leakage in the cooling system. In addition, there should be a discharge water valve at the water inlet, and a discharge air valve at the water outlet.

The air cooled screw chiller is running, the valve handler has to be taken away to ensure the valve doesn’t close by mistake.

If the discharge water valve is open while the unit is running, the accident will occur by no water.

7.3.5Cooling water pipes have to be heat-preservation to avoid condensing water generated.

7.3.6The unit operation has to follow manual especially in the area where the temperature is below zero in winter.

1)Air cooled screw chiller is cooling only in summer and shut down in winter. After the unit shutdown, the water inside of water pipe has to be discharged completely from pipe avoiding pipe freeze to broken

2)If Air cooled screw chiller is a heat pump type unit. If it works in heating only during day time and the water pump should be kept running at nigh.

It may work in heating mode at nigh according to water temperature to prevent the unit can not start up because of low water temperature. The anti-freeze precaution has to be taken in the chilling area.

3)In the area where the ambient temperature is below – 5℃, this air cooled screw chiller unit should install an auxiliary water heater to endure the unit running reliable.

4)In the area where the ambient temperature is below -10℃, It is not suitable to use a heat pump type unit because of the low heating efficiency of the heat pump.

7.4WATER QUALITY CONTROL
The industrial water as a cooling water source has less furring.

The well water or river water as a cooling water source has more furring and even deposit as sand, etc., these can cause water flow reducing and freeze accidents in the evaporator, and so cooling water has to pass filter and soft by chemical substance before going into the cooling system.

The PH value, conductivity, chlorine ion, and sulfur ion have to meet TopChiller standard.

The water purity standard
PH 6.5-8.0
Conductivity ≤200uv/cm(25°)
chlorine ion ≤50ppm
vitriol ion ≤50ppm
Total iron ≤0.3ppm
Alkali ion ≤50ppm
Total hardness ≤50ppm
sulfur ion None
Ammonia ion None
Sand ≤30ppm
Sodium-ion None

NOTE:
(1)Please not install the unit indoor. If you have to install it indoor, the minimum distance from the ceiling to the vent has to be equal or greater than 1.5 meters, and enough airflow.

(2)The refrigerant is R22. It is no-flammable, no poison substance. Because the special gravity of R22 is heavy than air, it will spread and may cause people to strangle if leakage occurs. So good ventilation has to implement if the unit is indoor.

(3)If leakage occurs, stop the air cooled screw chiller immediately, and contact repairing personnel. It forbids any lighter on the site. Because if R22 touches lighter, it will spread harmful gas.

(4)The air cooled screw chiller has to be reliable grounded; the wiring has to be correct, tight.

8.TESTING-RUN AND ADJUSTMENT

8.1INSPECTION BEFORE RUNNING
Before adjusting the air cooled screw chiller unit, TopChiller personnel have to regularly check the chiller unit and accessories to ensure unit quality. The check items refer to the below items.

8.1.1Inspection
Debugging personnel should check items according to sheet 1, if there is any unqualified item, modify it before entering the adjusting program.

8.1.2Water system operating
After time after time cleaning the water system and water quality meets the requirement, turn on two service valves that connect to the air cooled screw chiller.

Filling water one more time, discharge it, and then switch on the water pump, confirm outlet pressure of water flow.

8.1.3The air cooled screw chiller simulating the operation
In the condition of air breaker of compressor and condenser are off, refer electrical principle drawing and < Electrical usage instruction >,tests actions on electrical parts and control logic (Note: If phase sequence error, the unit can not startup).

8.2TESTING-RUN
Under item

(1)normal condition, the test-run may take and method is as below.

8.2.1Adjust cooling system flow valve carefully (or the unit inlet service valve), to make system water flow be 90% water flow required by the nameplate on the unit.

8.2.2Switch on air breaker of compressor and condenser, modify the setting-up value for temperature, after press “ON/OFF” key (switch on/off key), the unit displays “On” state and then start the unit up.

If a malfunction occurs, air cooled screw chiller will shut down and display a malfunction message.

8.2.3Test and record items according to contents in sheet 3. If any abnormal occurs, press emergency off-key quickly to stop running (note: normal shutdown the unit does not allow to press this button). After analysis of the problem, do this procedure again.

8.2.4After testing-run 15 minutes, observe sigh glass and check if it is blue color, is any air bubble or steam, it does, please add refrigerant R22.

8.2.5After testing-run 30 minutes, the water temperature at outlet reaches to prescriptive value, adjust the water flow to a nominal value, then set up outlet temper and dynamic different according to user load, and system actual instance to ensure the unit operates normally.

After the air cooled screw chiller stops, wait for 10 minutes to restart.

The screw chiller unit can not start and stop frequently.

Finally, check controllers setting values of the unit to finish the testing and inspecting.

Warning!
1)When cleaning the water system, the impurity water does not allow go into the dry-type evaporator. Please turn off the inlet valve of the unit, and turn on the outlet valve when cleaning the water system.

2)Before discharge water from the water system, the unit forbids to start up.

3)Water pump and paddle flow switch have to be interlocked, otherwise, the user takes full responsibility for any problem that occurs by lacking water.

4)During test-run, the interval of the unit has to be longer than 4 minutes.

9.Operating and maintenance
For ensuring the unit running in a long period, the unit should be tested and adjusted by TopChiller professional personnel or skills technician under TopChillert’s expertise supervising daily operation and maintenance has to be done by trained air conditioning technicians.
The operator has to pay attention to the following components.

TYPE AND FREQUENCY OF SCHEDULED MAINTENANCE
All maintenance operations must be done by experienced personnel, qualified to work with conditioning and cooling systems.

Always switch off the air cooled screw chiller to cut off the power supply before any maintenance work, even if the only inspection is involved.

In order to guarantee regular, efficient air cooled screw chiller operation, it is advisable to schedule an overall inspection at regular intervals, in order to prevent irregular functioning which could damage the machine’s main components

PERIODIC CHECKS LIST

9.1MAIN ACCESSORIES
9.1.1Compressor: Observe discharge pressure, absorb pressure, oil supply pressure, and oil level, etc, If anything is abnormal, find out the problem, fix it.

The frequency of the screw chiller start and stop should be less than 6 times per hour, and each time the air cooled screw chiller starts and run should be 5 minutes and more.

9.1.2Oil pressure difference control’s reliability ( for semi-hermetic piston-type compressor)。

9.1.3Electrical equipment: should be attention to working voltage, current, and phase sequence. For the contactors, check wire connectors, and see if there is an oxide or other reason to cause the problem.

9.1.4Control and protecting equipment: Don’t adjust any setting value at job site.

9.1.5Regular check electrical wiring, if find out any loose connector, tight it up to the right way.

9.1.6Regular check electrical components, if find out any unreliable part, replace right way.

9.1.7Pay attention to electrical control box at any time for heating, It should have good ventilation. If the wire becomes aging, change it in time.

9.2LUBRICATION
The compressor has been filled with lubrication before leaving the factory.
9.2.1The operator has to monitor the oil level from sight glass while the unit is running, Oil level has to be above the bottom of sight glass; after shutting the unit down, the oil level should be above the middle of the sight glass.

9.2.2Every spring and fall is the maintenance season. if find oil color becomes black, or copper pieces in the oil, oxygenated impurity, the lubricating oil must be replaced with the same model after clean the oil filter, and bottom of the oil tank.

This job should be done under TopChiller’s expertise guide.

9.2.3When cleaning oil filter, should also clean magnet which in under oil tray.

9.3CLEANING DIRTY
After a long period of running, the inside of the pipe in the dry-type evaporator is accumulated calcium oxide or other mine substance. It conducts electrical consume increase, discharge air pressure rising, and absorb pressure dropping.

9.4SHUT THE UNIT DOWN IN WINTER
When shutting the unit down in winter, the air cooled screw chiller should be clean from inside or outside.

Refrigerant should be sucked into the condenser and then close the inlet gas valve and outlet liquid valves.

Covering the unit up to prevent dust, and make sure tighten the pressure covers, valve’s nuts and screw off the discharge water nuts.

In the ice-freezing area in winter, the water has to be completely discharged from the condenser to avoid freeze to split accidents.

9.5START THE UNIT IN SPRING
After a long period of time the air cooled screw chiller shutdown, the following preparation work has to be done first before restarting this air cooled screw chiller unit.

6.5.1Inspect and clean the unit completely

6.5.2Clean water pipeline

6.5.3Inspect pump, cooling tower, and adjustment valve

6.5.4Tighten all wiring connectors tightly

Note:
If the air cooled screw chiller had been shut down for a long time, it should pre-heat compressor oil 24 hours before its startup.

Pre-heat time for lubrication of the compressor according to weather and ambient environment, but preheat time cannot be less than 12 hours.

9.6REPLACE PARTS
The replaced parts should be TopChiller’s parts; it does not allow to use other manufacturer’s parts to instead without TopChillert’s permission

9.7COOLING SYSTEM
6.7.1Filter net: Please check the absorbing filter net and make sure it doesn’t block when turn on the cooling system.

6.7.2Filling Refrigerant: When filling refrigerant, observe sucking and discharging pressure from sight glass. If there is any leakage, or replace the parts, the air-seal testing is required. Filling refrigerants should be treated in two ways.

1)Because leaking, there is no refrigerant left. Before filling refrigerant,
2)The cooling system has to be dry and vacuumed completely.
Turn on all valves.
Connect the vacuum between low pressure and high pressure.
The whole system is vacuumed by a vacuum pump.
The proper refrigerant amount and main technical data are shown on the nameplate. The refrigerant filling uses refrigerant filler.
The refrigerant filled by weight may be affected by ambient temperature. In this case, turn off the fluorine container valve temperately temporarily, let cooling water circulating in evaporator and startup the unit, at the same time, short-circuit low pressure controller temporarily.
Note: After filling refrigerant, re-connect wires back to normal!

3)Filling refrigerant
The refrigerant filler is connected into the low-pressure side filling connector, and connect pressure gauge at low pressure and high-pressure side.
Make cooling water circulating, and startup the unit, short-circuit controller if necessary.
Slowly fill refrigerant into system, monitor absorb, discharge pressure value. The open degree of filling fluor in the valve should be in pressure between 0.15-0.2Mpa, It doesn’t allow to open completely.

Warning!
When inspecting leakage and airtight test, it forbids filling oxygen, ethane, etc., burnable or poisoned gas. This kind of gas may cause an explosion or dangerous situation.

9.8UNINSTALL COMPRESSOR
Please following below steps for uninstall.
6.8.1Turn off the unit power supply switch;
6.8.2Turn off service valves of the inlet and outlet of the compressor.
6.8.3Take off the connecting bolts of sucking, discharging flanges of the compressor
6.8.4Take off the power supply cable connection.
6.8.5Take off the fixing bolts of the compressor.
6.8.6Remove away the compressor.

9.9SYSTEM ANTI-FREEZE
If the heat exchanger of evaporator or pipes freezes to broke, it will result in serious leaking. This kind of damage is not on the guarantee. The user has to pay attention to three things.

6.9.1The air cooled screw chiller stops and backups in low ambient temperature.

6.9.2If the temperature of the outdoor unit is below 0℃, the water in the evaporator should be discharged completely.

6.9.3The air cooled screw chiller is operating
If the cooling water flow switch and low-pressure protection are unavailable, the water pipe may freeze. So that cooling water flow switch and unit control system should be interlocked.

6.9.4Maintenance
When the system pressure is under 0.4Mpa, the pipe freeze may occur, so the water in the system should be flow or discharge water completely.

Note:
1)Maintenance regularly
The unit should be maintained regularly to ensure the unit operating in a good state.
2)Fireproofing
If there is a fire, the main switch should be off, use a fire extinguisher.
3)Prevent flammable gas.
The unit should be far away from gasoline, alcohol, oil made production, etc. flammable gas to avoid an explosion.
4)Operation panel and electrical control box
The operation panel is installed inside of the electrical box. When operating, need to open the control box cover first. Be careful to avoid electrical shock.
5)Please don’t touch the discharge pipe avoiding to be burned. The temperature may reach to 100℃ and higher.
(1)Don’t cool or heat the drink water and food.
(2)Malfunction
If there is any malfunction occurs, find out the cause first, and then restart the unit. In addition, if the unit has abnormal vibration and noise, please stop the unit right way, find out the cause.
(3)Insurance
The fuse has to use in allow range, it forbids to use iron wire or copper wire to instead fuse.
(4)Protection equipment
Don’t short-circuit the protected equipment, otherwise, It will cause serious problems.
(5)The setting value has been set up before the unit delivery to users. The users don’t change it, otherwise, it will cause serious problems. Don’t touch any electrical components except switch includes an emergency switch.
(6)The air cooled screw chiller should manage by skilled air condition operators. Record relative data and analyze it to judge the operating situation.

10Malfunction analysis and trouble-shooting
Main malfunction and trouble-shooting of air cooled screw chiller:

MalfunctionPossible causeTroubleshooting
Air cooled screw chiller does not start.No electrify

The main switch doesn’t on

The control circuit has no electrify

The unit malfunction(alarm)

The temperature setting value is higher than the evaporator inlet.

The phase sequence is wrong, phase sequence protector action.

Electrify

Switch on the main switch

Electrify control circuit

Find out the cause and fix it

Check and modify setting value

 

Change two or three-phase

The screw compressor does not startupThe screw compressor has no electricity

Thermal protection switch act or fuse broke

Motor short-circuit

Contactor coil burn

Compressor motor doesn’t rotary

Pressure controller to make the system stop.

Liquid valve work abnormal

Water system malfunction, water flow switch break off.

Electrify compressor

Find out the cause and reset switch or replace a fuse

Check motor

Replace contactor or coil

Fix compressor

Find out the cause before reset pressure controller

Repair or replace

Ensure proper water flow

Compressor low cooling efficiency or no coolingCompressor gas valve damaged

 

Refrigerant leaks

 

Four-way valve leak or damaged (heat pump)

The thermal expansion valve doesn’t adjust correctly.

Thermal expansion valve damaged

Air and no-condensing gas in the system

Condenser fin dirty or evaporator heat exchanger dirty

Replace compressor gas valve and valve plate

Find out leak source,fix it, then fill the refrigerant

Replace four-way valve

 

Adjust thermal expansion valve open degree.

Replace the thermal expansion valve

Discharge air from condenser or receiver

Clean condenser and heat exchanger

Compressor run continuously low efficiency or no heating ability (heat  pump)Refrigerant leak

 

Compressor air valve damaged

Four-way valve leak or coil burn

Find out leak source, fix it, then fill the refrigerant

Replace valve and valve plate

Replace four-way valve or coil

Compressor stop because high-pressure protection actThe ambient environment too high, condensing airflow no enough

Condensing fan motor malfunction

High-pressure shutdown, the setting value is not correct

Overfill fluidizers

 

The system has air or other no-condensing air

Defrost (heat pump) time setting too long

Four-way valve damaged

The inlet temperature of the evaporator is not correct

Repair condensing fan motor

 

Repair or replace the condensing fan motor

Check high-pressure, pressure controller

Check the number of fluidizers, then discharge portion fluidizers

Discharge air from condenser or receiver

Set up reasonable defrost time.

 

Replace four-way valve

Check water system

Compressor stop because of motor overloadVolt is too high or low

 

The discharge pressure is too high or low

Water temperature is too high

Overload element malfunction

Ambient temperature is too high

The motor or terminal short-circuit

Check volt, and ensure volt is in 10% range

Check discharge pressure.

Check backwater temperature

Check the compressor full load current.

Increase ventilating ability

Check resistance of motor and terminal

Temperature protection switch inside compressor act to force compressor stopVoltage is too high or low

The discharge pressure is too high

Jet type magnetic valve damaged (screw compressor)

Condensing water inlet temperature is too high

The protection switches are malfunction inside the compressor.

Check voltage and make sure voltage is in the required range

Check discharge pressure and find out the cause

Replace a new one

Check cooling water inlet and find out the cause

Stop running 10 minutes and check if any leak, repair and refill fluidizer

Unit suck  pressure is  too low in  heating ( heat pump)Heating expansion valve malfunction or dirty

Pipe blocked

Four-way valve leak

Fan motor damaged

Refrigerant is not enough

Ambient temperature is too low

Repair or replace the thermal expansion valve

Clean bloke substance

Replace four-way valve

Check fan motor

Fill refrigerant

The air cooled screw chiller should be stopped when ambient temperature low than unit allowed temperature

Compressor stop because of low-pressure protectionDry filter blocked

The expansion valve is a malfunction

Refrigerant is not enough

Replace filter

Adjust or replace the expansion valve

Check if any leak, repair, and refill.

Defrosting doesn’t stop(heat pump)Refrigerant is not enough

Defrost control adjustment is improper

Defrost sensor damaged

Reversing valve malfunction

Compressor air valve damaged

Repair, fill the refrigerant

Re-adjust defrost time.

Change defrost sensor

Check and replace

Replace air valve and valve plate

The refrigerant in liquid status goes into compressor when Heat pump runningThermal expansion valve setting is improper

Thermal expansion valve probe is in an improper position

Thermal expansion valve size is improper

Re-setup the thermal expansion valve

 

Replace temperature probe

 

Clean or replace the thermal expansion valve

When a double system running or multi-system running, one pressure drop suddenly and other system pressure increaseDry-type evaporator leakTake off two end cover, replace the washer, and tighten up the screw.
The discharge pressure is too lowLiquid refrigerant goes into the compressor from the evaporator to generate a bubble.

 

 

Compressor discharge valve damaged

Refrigerant is not enough

Check and adjust the expansion valve

Ensure expansion probe contact suck pipe closely and isolate heat from outside.

Repair or replace the discharge valve

Refill it

Suck pressure too highDischarge pressure too high

Refrigerant filled too much

The liquid status refrigerant goes into the compressor from the evaporator.

The cooling water inlet temperature is higher than the allowed the highest value

See” discharge pressure too high”

Discharge partly refrigerant

Check and adjust the expansion valve

Check water supply system

Compressor sound level  too highOil level too low

 

Suck, discharge valve damaged

 

Thermal expansion valve open too wide, and liquid status refrigerant goes into the compressor

Find out the cause and replace same model oil

Replace compressor suck, discharge valve

Check thermal probe location or adjust overheat ratio

Compressor off of oilLacking refrigerant

Sucking pressure is too high

Crankcase heat exchange damaged

Oil filter blocked

Check to leak, and refill refrigerant

Adjust expansion valve

Check and  replace

Clean oil filter

Unload device doesn’t workThermal sensor or computer is a malfunction

Magnetic valve malfunction

 

Unload device wear and tear mechanically

Check if the computer has output or not when temperature varies

Check if any coil broke in magnetic valve

Check to unload system parts of the compressor

11. Warranty

24-month Warranty – This Product is warranted to be free from defects in material and workmanship.

If the defect appears within 24 months from the date of original installation, whether or not actual use begins on that date, then the product does meet this warranty.

A new or remanufactured part, at the manufacturer’s sole option, to replace any defective part will be provided without charge for the part itself; PROVIDED the defective part is returned to the distributor through a qualified servicing dealer.

THIS WARRANTY DOES NOT INCLUDE LABOR OR OTHER COSTS incurred for diagnosing, repairing, removing, installing, shipping, servicing or handling of either defective parts or replacement parts. Such costs may be covered by a separate warranty provided by the installer.

THIS WARRANTY APPLIES ONLY TO PRODUCTS IN THEIR ORIGINAL INSTALLATION LOCATION AND BECOMES VOID UPON REINSTALLATION.

LIMITATIONS OF WARRANTIES – ALL IMPLIED WARRANTIES (INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY) ARE HEREBY LIMITED IN DURATION TO THE PERIOD FOR WHICH THE LIMITED WARRANTY IS GIVEN. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE MAY NOT APPLY TO YOU. THE EXPRESSED WARRANTIES MADE IN THIS WARRANTY ARE EXCLUSIVE AND MANY NOT BE ALTERED,
ENLARGED, OR CHANGED BY ANY DISTRIBUTOR, DEALER, OR OTHER PERSON
WHATSOEVER.

ALL WORK UNDER THE TERMS OF THIS WARRANTY SHALL BE PERFORMED DURING NORMAL WORKING HOURS. ALL REPLACEMENT PARTS, WHETHER NEW OR REMANUFACTURED, ASSUME AS THEIR WARRANTY PERIOD ONLY THE REMAINING TIME PERIOD OF THIS WARRANTY.

THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR:
1. Normal maintenance as outlined in the installation and servicing instructions or owners manual including filter cleaning and/or replacement and lubrication.

2. Damage or repairs required as a consequence of faulty installation, misapplication, abuse, improper servicing, unauthorized alteration or improper operation.

3. Failure to start due to voltage conditions, blown fuses, open circuit breakers or other damages due to the inadequacy or interruption of electrical service.

4. Damage as a result of floods, winds, fires, lightning, accidents, corrosive environments or other conditions beyond the control of the Manufacturer.

5. Parts not supplied or designated by the Manufacturer, or damages resulting from their use.

6. Electricity or fuel costs or increases in electricity or fuel costs from any reason whatsoever including additional or unusual use of supplemental electric heat.

7. ANY SPECIAL INDIRECT OR CONSEQUENTIAL PROPERTY OR COMMERCIAL
DAMAGE OF ANY NATURE WHATSOEVER. Some states do not allow the exclusion of incidental or consequential damages, so the above may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which may vary from area to area.

Air-cooled screw chiller system drawing

Air-cooled screw chiller system drawing

1. screw compressor2.dry type evaporator3. fin heat exchanger
4. condenser fan5. liquid container6. safety valve
7. shut off valve8. dry filter9. sight glass
10. solenoid valve11. cooling expansion valve12.spray solenoid valve
13. spray expansion valve14. condenser pressure controller15. high pressure controller
16. high pressure fluorine gauge17. low-pressure controller18. low pressure fluorine gauge
19. small shut-off valve20.pin valve
Air-cooled screw chiller system drawing

Air-cooled screw chiller system drawing

1. screw compressor2. 4-way valve3. dry type evaporator
4. fin heat exchanger5. condenser fan6. storage container
7. safety valve8. shut-off valve9. dry filter
10. sight glass11. solenoid valve12. cooling expansion valve
13. 0ne-way valve14. gas-liquid separator15. heating expansion valve
16.gas-liquid mixing17.heating by-pass valve18.small shut-off valve
19. jet solenoid valve20. jet flowing control gauge21. condenser pressure controller
22. high pressure controller23. high-fluorine-pressure gauge24. low pressure controller
25. low-fluorine pressure gauge
AIR COOLED WATER CHILLER WATER CIRCUIT CONNECTIONS

AIR COOLED WATER CHILLER WATER CIRCUIT CONNECTIONS

Why TopChiller® Can Be a Reliable Supplier for Air Cooled Screw Chillers?

1. Premium Quality and Excellent Performance of all models of air cooled screw chillers

TopChiller® Air Cooled Screw Chillers are aimed to optimize the energy efficiency of the target devices.

And the use of such chillers will reduce operating costs and improve business profitability, effectiveness, and energy conversation.

By employing a semi-hermetic dual screw compressor, TopChiller® air cooled screw chillers are energy-efficient and able to regulate energy performance levels from 0% to 100% for maximum electricity savings.

Working at high noise levels will affect the health of the workers and more and more employees opt for a quiet environment to work in.

It’s also crucial that companies should focus on noise reduction, especially in sound-sensitive workplaces.

With single main rotors and mufflers built inside, TopChiller® air cooled screw chillers are able to reduce sound levels and vibration to the minimum when they are either running at part load or full load conditions.

 

Air Cooled Screw Chiller

Air Cooled Screw Chiller

2. A Comprehensive Range of Services

Since the chillers are daily used in various industrial processes, it’s extremely important to ensure the chiller is operating normally.

If the chiller gets out of order, it might result in a critical decrease in cooling capacity and even economic damages.

For every chiller purchased from TopChiller®, its quality must be carefully checked before shipment to ensure the client will receive a satisfying chiller.

In the meantime, TopChiller® also provides a comprehensive range of services for pre-sales questions and after-sales issues, covering everything from product inquiries to maintenance support.

All clients can still expect professional and personal care and reliable services from our support team at any time.

TopChiller® has served customers from over 58 countries and regions. All of our air cooled screw chillers come with an 18-month warranty and we are always to offer lifetime technical support to our valued clients.

Air Cooled Screw Chiller Technical Specifications

3. Certifications and Awards

All air cooled screw chillers manufactured by TopChiller® are CE marked and comply with standards products sold in Europe.

In China, TopChiller® also earned a series of awards conferred by the government for energy-saving and technology innovation.

CE Certification

4. Customizable air cooled screw chillers

As there are many industries and each industry may require air cooled screw chillers of specific sizes and cooling capacities.

It’s very important to check if there is a standard air cooled screw chiller model that just can meet your requirements and achieve maximum profitability for the production process.

At TopChiller®, we provide a wide range of air-cooled screw chillers and screw chillers also come with various specifications for the customers to choose.

If you have a custom request of nonstandard air cooled screw chiller that can’t be found on our website, please contact us right away and we would be more than happy to help.

Air Cooled Screw Chiller

5. Fast delivery and careful shipment

If you purchase air cooled screw chiller from TopChiller, we give very fast delivery because for some often used or commonly used chiller models, we have stocks in our warehouse.

Even if the customized air cooled screw chiller based on your specific requirements, we also have all ready chiller spare parts.

The above ensures we can give you very quick delivery of your air cooled screw chiller.

We always care about the shipment of your air cooled screw chiller, please check below container loading of 200Ton air cooled screw chiller into 1*40HQ to Singapore seaport.

Conclusion

TopChiller® is committed to sustainable development and the concept has been integrated into our corporate culture.

The air cooled screw chillers supplied by TopChiller® are energy efficient and suitable for printing, cement cooling, plasma cutting, and many other industrial applications.

Air Cooled Screw Chiller

The cooling capacity of our premium air cooled screw chillers ranges from 30 Ton to 550 Ton and their operating sound levels are very low in all conditions.

TopChiller® air cooled screw chillers are widely used by all kinds of industrial companies all over the world.

150Ton Air Cooled Screw Chiller in Saudi Arabia

If your current chiller shows signs of aging and you are considering replacement, we are confident that you will find using our screw chillers will help you a lot with production efficiency and cost reduction.

With 20 years of experience in air cooled screw chiller manufacturing, TopChiller is willing to provide all technical support to clients worldwide.

If you are searching for a high-quality air cooled screw chiller manufacturer, Please do contact TopChiller team to get an ultimate air cooled screw chiller solution.

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