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25HP 20 Ton Air Cooled Explosion-Proof Chiller
  • 25HP 20 Ton Air Cooled Explosion-Proof Chiller25HP 20 Ton Air Cooled Explosion-Proof Chiller
  • 25HP 20 Ton Air Cooled Explosion-Proof Chiller25HP 20 Ton Air Cooled Explosion-Proof Chiller
  • 25HP 20 Ton Air Cooled Explosion-Proof Chiller25HP 20 Ton Air Cooled Explosion-Proof Chiller

25HP 20 Ton Air Cooled Explosion-Proof Chiller

Tongwei is a well-experienced and professional standard water chiller and custom chiller manufacturer and supplier in China over 15 years,which can provide a wide range of custom chiller from 1/2 Ton to 200 Ton cooling capacity.This 25HP 20 Ton air cooled explosion-proof chiller is designed to withstand harsh and hazardous environments,which are built for demanding applications including food, pharmaceutical, biotechnology, chemical, nuclear science, laboratories and so on.All custom chiller units are with 12 months warranty time including free spare parts and full-time technical support and low cost of maintenance, Tongwei can provide high quality ,competitive price and fast delivery time to you for all chillers . we look forward to becoming your long-term custom explosion-proof chiller supplier in China.

Chiller Model: TW-25AD
Cooling Capacity: 68KW(38270kcal/h) @ 50HZ / 81.6KW(45924 kcal/h) @ 60HZ
Refrigerant: R22/R407c/R410a/R134A/R404a
Power Supply: 380V/50HZ /3PH (Standard) / 208-480V/60HZ/3PH(Customized)
Compressor Brand: Panasonic Scroll Compressor
Evaporator Type: Coil in SS Water Tank (Standard) / Shell and Tube(Customized)
Noted:Fan,water pump and electrical box is with explosion-proof

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Product Description

25HP 20 Ton Air Cooled Explosion-Proof Chiller

Explosion-proof chillers are designed to withstand explosive and hazardous environments. Our custom explosion-proof chillers are engineered and built to meet specific regulations and NEC classifications. All explosion-proof chillers are customized to your order and can meetClass 1 Division 1 and Class 1Division 2 requirements. We offer chiller options in a variety of capacities to suit your facility's needs.

Tongwei manufactures different types of explosion-proof chillers:air-condensing explosion-proof chiller and water-condensing explosion-proof chiller, both of them have a reinforced design to protect its components from ambient flammable materials that could cause an explosion. Their components are contained in a packaged chiller housing. (Some models are available in space-saving designs with smaller footprints.) We will build an explosion-proof refrigerator to your specifications to safely cool your application, starting with welding a stainless steel storage cooling tank that has an interior Stainless steel evaporator coil.

25HP 20 Ton Air-Cooled Explosion-proof Chiller model TW-25AD is with the cooling capacity is about 70KW ,which use explosion-proof water pump,fan and electrical box,which includes two 12.5HP multi-stage hermetic scroll compressors using R410A/R407C refrigerant. The refrigerant is a non-depleting ozone gas and is considered environmentally friendly.

Tongwei is the reliable manufacturer and supplier of custom chiller and cooling system, located in China. With many years of experience, we guarantee the production of the best quality custom chiller system with amazing specifications and super warranty offers.Tongwei can help find the right chiller solution for your building. We provide long-lasting chillers that are customized based on your needs. Contact us today to get started with a suitable chiller system.

Air Cooled Explosion Proof Chiller

Explosion-proof Chiller Technical Specification

TW-A series Explosion-proof Chiller Techinical Parameters
Item                   Model TW-0.5A TW-1A TW- 1.5A TW-
Cooling capacity Kcal/h
1419 2451 3182 4833 5848 7181 9288 11988 14534 18576 23994 29068 38270
1703 2941 3784 5800 7018 8617 11146 14386 17441 22291 28793 34882 45924
1.65 2.85 3.7 5.62 6.8 8.35 10.8 13.94 16.9 21.6 27.9 33.8 44.5
1.98 3.42 4.4 6.74 8.2 10.02 12.96 16.73 20.28 25.92 33.48 40.56 53.4
Input power KW 0.88 1.35 2 2.25 2.66 3.27 4.07 5.75 6.45 8.25 11.5 12.9 17.45
Max Current A 5.4 8.2 12 13.6 6.6 8.2 10.1 13.8 15.5 20 27.9 31.3 42.4
power source 1PH/3PH~220V/380V~50HZ/60HZ            3PH~380V/415V~50HZ/60HZ(3PH~200V/220V~50HZ/60HZ)
Refrigerant Type  R22/R407C/134a/404A/410A
Control Capillary/External balance thermal expansion valve
Compressor Type Hermetic Rotary/scroll Hermetic scroll ( piston )
Power(KW) 0.45 0.89 1.3 1.73 2.1 2.7 3.5 4.55 5.25 3.5×2 4.55×2 5.25×2 7×2
Condenser Type Efficient finned copper tube with aluminum + low noise external rotor fan
Air flow(m3/h) 750 1000 1500 2000 2500 3000 4000 5000 6000 8000 10000 12000 15000
Air blower(KW) 0.06 0.09 0.15 0.15 0.19 0.14×2 0.14×2 0.19×2 0.19×2 0.25×2 0.45×2 0.45×2 0.6×2
Evaporator Type Tank coil/ shell and tube type/Plate type heat exchanger
Chilled water(m3/h) 0.28 0.49 0.64 0.97 1.12 1.44 1.86 2.4 2.91 3.71 4.8 5.81 7.65
0.34 0.59 0.76 1.16 1.4 1.72 2.23 2.88 3.49 4.46 5.76 7 9.18
water tank(L) 10.6 18.3 27 27 50 50 60 60 110 120 200 200 270
inlet/outlet pipe(inch) 1/2" 1/2" 1/2" 1/2" 1" 1" 1" 1" 1" 1-1/2" 2" 2" 2"
Water pump Power(kw) 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.75 0.75 0.75 1.5 1.5 2.2
Max lift(m) 22 22 22 22 22 22 22 30 30 25 25 25 28
Max flow (m3) 5.4 5.4 5.4 5.4 5.4 5.4 5.4 8.1 8.1 8.1 13.5 13.5 25.2
Safety devices Compressor overheating protection,overcurrent protection,high and low pressure protection,overtemperature protection,traffic protection,phase sequence/phase loss protection,low level protection,anti-freezing protection.
Dimension Length(mm) 550 550 600 600 720 980 980 1150 1150 1350 1500 1500 1860
Width(mm) 350 450 500 500 550 520 520 560 560 680 760 760 850
Height(mm) 695 845 985 985 1350 1170 1170 1215 1215 1530 1660 1660 1900
Weight Kg 45 62 85 95 125 152 175 185 215 283 345 382 580
1.Rated cooling capacity is based on: chilled water inlet and outlet water temperature 12℃/ 7℃, the cooling air inlet and outlet temperature 30℃/ 35℃
2.Scope of work: chilled water temperature range: 5℃to 35℃; chilled water inlet and outlet temperature difference: 3℃to 8℃.
The ambient temperature of condensation: Not higher than 35℃(non-standard chiller ambient temperature of condensation can reach maximum 55℃, need to order production). 

TW-A Series Explosion-Proof Chiller Techinical Parameters
Item                 Model TW-15AT TW-20AD TW-20AF TW-25AD TW-25AF TW-30AD TW-30AT TW-40AD TW-40AF TW-50AD TW-50AF TW-60AD
Cooling capacity Kcal/h
36120 49966 47988 58480 58136 74734 74922 98040 99760 119024 116960 144996
43344 59959 57586 70176 69763 89681 89990 117648 119712 142829 140352 173995
42 58.1 55.8 68 67.6 86.9 87.2 114 116 138.4 136 168.6
50.4 69.72 66.96 81.6 81.12 104.28 104.64 136.8 139.2 166.08 163.2 202.3
Input power KW 17.1 21.73 22 25.4 24.8 33.39 33.1 44.91 43.3 57.3 54 65
Max Current A 43.2 52.7 53.3 63.7 61.3 81 80.2 109 106 135.5 128.5 135
power source 3PH~380V/415V~50HZ/60HZ(3PH~200V/220V~50HZ/60HZ)
Refrigerant Type  R22/R407C/134a/404A/410A
Control  Capillary/External balance thermal expansion valve
Compressor Type Hermetic scroll ( piston )
Power(KW) 4.55×3 8.96×2 4.55×4 10.8×2 5.25×4 13.62×2 8.96×3 18.78×2 8.96×4 23.6×2 10.8×4 27.4×2
Condenser Type Efficient finned copper tube with aluminum + low noise external rotor fan
Air flow(m3/h) 15000 20000 20000 25000 25000 30000 30000 40000 40000 50000 50000 60000
Air blower(KW) 0.6×2 0.78×2 0.78×2 0.78×2 0.78×2 0.42×6 0.42×6 0.6×6 0.6×6 0.78×6 0.78×6 0.78×6
Evaporator Type Tank coil/ shell and tube type/Plate type heat exchanger
Chilled water(m3/h) 7.22 10 9.6 11.69 11.62 14.94 15 19.6 19.95 23.8 23.4 29
8.67 11.99 11.51 14.03 13.95 17.93 18 23.52 23.94 28.6 28.1 34.8
water tank(L) 270 350 350 350 350 420 420 580 580 580 580 580
inlet/outlet pipe(inch) 2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 2-1/2" 3" 3" 3″ 3″ 3″
Water pump Power(kw) 2.2 2.2 2.2 2.2 2.2 4 4 4 4 5.5 5.5 5.5
Max lift(m) 28 28 28 28 28 30 30 30 30 32 32 32
Max flow (m3) 25.2 25.2 25.2 25.2 25.2 36 36 36 36 40 40 40
Safety devices Compressor overheating protection,overcurrent protection,high and low pressure protection,overtemperature protection,traffic protection,phase sequence/phase loss protection,low level protection,anti-freezing protection.
Dimension Length(mm) 1860 2020 2020 2020 2020 2200 2200 2350 2350 2600 2600 2600
Width(mm) 850 950 950 950 950 1150 1150 1350 1350 1500 1500 1500
Height(mm) 1900 2000 2000 2000 2000 1980 1980 2000 2000 2100 2100 2100
Weight Kg 580 650 650 810 810 890 890 1112 1112 1320 1320 1320
1.Rated cooling capacity is based on: chilled water inlet and outlet water temperature 12 ℃ / 7 ℃, the cooling air inlet and outlet temperature 30 ℃ / 35 ℃
2.Scope of work: chilled water temperature range: 5 ℃ to 35 ℃; chilled water inlet and outlet temperature difference: 3 ℃ to 8 ℃.
The ambient temperature of condensation: Not higher than 35 ℃ (non-standard chiller ambient temperature of condensation can reach maximum 55 ℃, need to order production). 

Why Explosion-Proof Chillers Are So Important

In order to protect the safety of employees and facilities, reducing the likelihood of explosions becomes the primary goal of any business owner. Some work-sites are more dangerous than others. Reduce the risk that sparks from the chiller could ignite explosive or flammable materials, which is why explosion-proof chiller is a safety requirement in many industries. Although the price of all explosion-proof equipment is high, the cost is far less than the loss of life caused by industrial accidents due to the use of the wrong machinery.

In addition to safety concerns, explosion-proof chillers are required by law in many locations where with combustible materials in the air. In addition to the danger of igniting flammable substances, non-compliance could result in huge emissions.

How Does an Explosion-Proof Chiller Work?

There are many types of explosion-proof chillers, and how each one works depends on the components used. For example, there are screw and scroll compressors, air-cooled and water-cooled condensers. The components of the chiller system are not explosion-proof. The design of the entire system. But these components determine the ultimate efficiency of the chiller and the temperatures it can reach. Use this information when choosing a chiller for your workplace.

Most chillers operate in the same way, in short, by continuously flowing refrigerant to the cold end of the evaporator at the desired temperature. The chiller then pumps the cooled fluid through the process to dissipate heat from the equipment and funnel it back to the return side. The range of chiller we choose is -60 F to 30 F. If you have any special requirements for the cooling of chiller, please contact us .

The refrigerant starts the process in a mixture of liquid and gas. The gas and liquid enter the evaporator, where the heat converts the refrigerant into a low-pressure gas. This gas enters a compressor, which compresses the gas to a high pressure state using one of several methods. This gas moves to the condenser, which can cool the refrigerant with water or air. In a condenser, the coolant releases heat and condenses into a liquid. When the liquid is at high pressure as it passes through the expansion valve, the expansion valve controls how much cooled refrigerant enters the evaporator and starts the cycle again.

Air-Cooled Explosion Proof Chiller Installation

Water-Cooled Explosion Proof Chiller Installation

Types of Explosion-Proof Chillers

We offer explosion proof chillers from 1/2 ton to 200 tons to cool all sizes in your application. Learn more about our explosion proof chiller.

Scroll Explosion Proof Chiller

Our single-, dual-, and multi-circuit scroll explosion proof chillers are available with scroll compressor, an industry-leading and long-lasting solution.

▪ Air- and Water-cooled Scroll

▪ 1 - 60 hp (1KW- 200KW)

▪ Single-, dual-, or multi-circuit(Three or Four )

▪ Panasonic or Danfoss scroll Compressor

20HP Air-Cooled Scroll Explosion Proof Chiller     

30HP Water-Cooled Scroll Explosion Proof Chiller       

Screw Explosion Proof Chiller

Our Single or Dual-circuit screw explosion proof chillers feature Hanbell or Bizter screw compressors for long-lasting performance and reliability.

▪ Air- and Water-cooled

▪ 60 - 300 hp (200KW-1500KW)

▪ Single or Dual-circuit

90HP Water-Cooled Screw Explosion Proof Chiller     

What Are The Main Components Of Explosion-proof Chiller

5.1 Compressor

The compressor is the key mover in explosion proof chiller because it produces pressure variations to stir the refrigerant around.

From 1/2HP(1/2 Ton) to 60HP(5oTon) explosion proof chiller , which is with Panasonic or Danfoss brand Scroll compressor ,

Above 60HP(50 Ton) explosion proof chiller , which is with Hanbell or Bitzer brand Screw compressor ,

These brand compressors are with high refrigeration efficiency,low noise ,energy saving,environmental protection and durability,safety and stability.

Panasonic Compressor

Danfoss Compressor

5.2 Evaporator

The evaporator is a crucial component of explosion proof chiller, as it is responsible for extracting heat from the liquid being cooled,it is located between the compressor and the expansion valve. There are three types of evaporators : coil in water tank evaporator , shell and tube evaporator, 304SS stainless steel plate type evaporator.

Coil in SS Water Tank Evaporator

SS Plate Type+ Water Tank Evaporator

Shell and Tube Evaporator

5.3 Water Pump

The water pump for explosion proof chiller is explosion-proof .

Explosion Proof Water Pump

5.4 Condenser

The condenser for air cooled explosion chiller is equipped with efficient cross-seam fins and female threaded copper tubes for high heat exchange efficiency and good stability. The fan on the top of explosion proof chiller is also explosion proof .


Aluminum fin+fan Condenser for explosion proof chiller

The condenser for water-cooled explosion proof chiller is shell and tube ,with the internal copper tubes employing an outer thread embossing process.This design effectively enhances the heat exchange efficiency between the refrigerant and water during the process. Compared to traditional smooth copper tubes, the outer thread embossing process increases the surface area of the copper tubes, thereby expanding the contact area for heat exchange and improving the thermal conductivity of the condenser. This optimization design allows the condenser of the water-cooled chiller to transfer heat from the refrigerant to the water more rapidly and consistently, enabling the water to carry away the heat.

Shell and tube Condenser for water-cooled explsoion proof chiller

5.5 Electric Box

The electric box for chiller is also explosion proof .

Explosion Proof Electric Box

Understand the explosion-proof Classes

Explosion protection classifications designed by the National Electrical Code (NEC) are key safety standards aimed to minimize the risk of explosions in environments containing flammable gases, vapors or combustible materials. These guidelines play a vital role in classifying electronic devices and equipment based on their ability to withstand potential explosions within structures.

In industries such as oil and gas, chemical processing, mining and manufacturing, compliance with these classifications is critical. Following these guidelines will not only protect personnel and assets but also significantly reduce the likelihood of a catastrophic event, maintaining high standards of operational integrity in high-risk environments.





Class I

Suitable for hazardous locations containing flammable gases or vapors.

Class II

Suitable for hazardous locations with combustible dust.

Class III

Suitable for dangerous places where flammable fibers or flying objects exist.



Division I

Designated locations where explosive materials are present under normal operating conditions.

Division II

Designating a location where explosive materials are handled or stored, subject to restrictions and controls.

Group (Class I)

Group A

Atmosphere containing acetylene

Group B

Places containing hydrogen or gases with equivalent hazards, such as man-made gases.

Group C

Locations containing ether vapor, ethylene or cyclopropane

Group D

Locations containing gasoline, naphtha, hexane, gasoline, butane, benzene, acetone, alcohol, paint solvent vapors, or natural gas.

Group (Class II)

Group E

Locations containing metal dust, including aluminum, magnesium, their commercial alloys and other similar hazardous metals.

Group F

Places containing coal, carbon black or coke dust.

Group G

Locations containing starch, flour, or grain dust.

What are the Applications of an Explosion Proof Chiller?

We equip our explosion-proof chillers with extra features and rugged materials to ensure reliable operation in critical applications for many years to come. From nuclear science to plastics and rubber, custom explosion-proof chillers are used in many applications and protect your employees and facilities.Explosion-proof chillers have a variety of applications where cooling and protection from any type of explosion is required, including as below :

Chemical Plants

Chemical factories may generate or store potentially flammable substances. Even in storage spaces, the facility will need explosion-proof equipment.

Petrochemical Plants

To distinguish a petrochemical plant from an oil refinery, the former manufactures substances from petroleum while the latter refines crude oil. Both handle hazardous materials. The popularity of many petrochemicals, such as gasoline, is partly due to their flammability. The same properties also put petrochemical plants at risk of fire.

Cooling Flammable Liquids

Flammable liquids often emit hazardous vapors. These vapors make explosion-proof chillers and other equipment in the space required. If the fluid remains sealed, the area will only require Class I, Division 2 approved equipment.


Petrochemical refinement requires extreme caution with all materials used. Flammable gases produced in refineries require Class 1 explosion-proof chillers.

Sample or Process Analyzers

Using sample or process analyzers, workers can identify the chemical makeup of various substances. Explosion protection in the sample analysis area saves lives as the components are unknown and potentially harmful elements.


Flour is very flammable. Ask anyone who lives near a granary and has heard stories of the explosions. The fine dust in the air only needs a small spark to detonate. This is why silos and grain bins require explosion proof equipment.


Ventilation in laboratories is critical to the safety and health of workers. Fire safety and explosion protection are also important. Anywhere volatile, flammable vapors or gases are present, special electrical components are required to prevent stray sparks that could ignite.

How I Can Choose The Right Explosion-proof Chiller System?

There are five important chiller specifications you need consider when you choose a chiller for your application :the voltage required for operation, the associated pump horsepower and flow rate (contact us for custom selection), refrigerant, and the evaporator type.

8.1 Cooling Capacity for chiller

One of the most frequently ask about how we can know the cooling capacity for chillers. We use KW ,Ton, But/h,Kcal/h to choose chiller cooling capacity :1 KW=860 kcal/h ;  1 TON=3.517 KW;1 KW=3412 Btu/h;

There is also a formula to calculate the cooling capacity for chiller:.

Cooling Capacity(kw)= Flow Rate(m3/h)*Temp Change(T1-T2)/0.86

Heat Load= C(specific heat)* M(quality output per hour )*Temp Change(T1-T2)

Oversize the chiller by 20% Ideal Size in KW = KW x 1.2

Noted : T1:Incoming Water Temperature (℃)      T2:Required Chilled Water Temperature(℃)    


For example, what size of chiller is required to cool 10m³ water from 35°c to 15 °c in 1 hour?

Temperature Differential = 35℃-15℃=20℃

Water Flow Rate = 10 m³/hour

Cooling Capacity in KW = 10 x 20 ÷ 0.86 = 232 KW

Oversize the chiller = 232 x 1.2 = 278.4KW

278.4 kw cooling capacity for chiller is required.

8.2 Power

Different countries and regions have different standards for industrial electricity, the common power supplies are 208-230V, 380-420V,440-480V,50Hz or 60Hz, 3phase.

Such in Philippines ,the power supply is 220V 60HZ 3PH , 380V 60HZ 3PH ,460V 60HZ 3PH;

in Singapore and Malaysia ,the power supply is 415V 50HZ 3PH;

in Mexico ,the power supply is 220V 60HZ 3PH;

In USA ,the power supply is 208V 60HZ 3PH;575V 60HZ 3PH;480V 60HZ 3PH and so on

8.3 Water Pump

When you decide the capacity/tonnage of the chiller, we will recommend you the suitable pump in KW,which standard water pump is about 2 bar .If you need more high water pressure , please us when you inquiry.

8.4 Refrigerant

R22, R410A, R407C, R404A, R134A are optional choices.

R22: good cooling effect, but R22 is considered a powerful greenhouse gas, so it’s forbidden in most countries.

R410A: eco-friendly, R-410A has replaced R-22 as the preferred refrigerant for use in residential and commercial air conditioners in Japan, Europe, and the United States. R-410A operates at higher pressures than other refrigerants.

R407C: a good replacement for R22, good cooling effect.

R404A: suitable for application that requires low temperature(below -10°c).

R134A: a non-flammable gas used primarily as a “high-temperature” refrigerant, suitable for air-cooled chiller working at a high ambient temperature above 50℃.

8.5 Evaporator Choose

Chillers generally have two types of evaporators: one is coil in water tank evaporator ,the other one is shell and tube evaporator.

Coil and tank evaporator, which has a built-in water storage tank for more convenient use,so there’s no need for extra buffer tanks. This is also our standard evaporator for chiller , if you don’t have buffer tank ,we just use this evaporator for your chiller.

Shell and tube type evaporator, which requires an additional water buffer tank to connect .

Shipping Way of 25HP 20 Ton Air Cooled Explosion-proof Chiller

As a professional water chiller supplier &exporter,we have our own shipment forwarder to arrange the shipment .Our chiller machine is with plywood packing,which prevent damage during transportation and meet export standards.There are three ways can delivery your chiller unit :

1. Ship by Air: As the chiller is with compressor ,water pump and fans ,the compressed refrigerant and oil inside the compressor is a dangerous item with the possibility of explosion , so it needs to release the compressed refrigerant before transportation. (It means that water chiller without refrigerant when choosing this shipping way. After the machine arrives at your destination, you need to add refrigerant by local professionals. The airline company also request us to provide many documents to prove that the chiller not a dangerous product. The freight cost by air is very high may be higher than the cost of chiller , So By air for delivery is not the mode of transport recommended to our customer.

2. Ship by Sea: The transportation time is longer than by air , but the freight cost is cheap ,and there is no need to add refrigerant after the equipment arrives at the destination.This shipping way is the most suitable mode of transportation for you to delivery your local port.

3.If you have your own shipment container in your other supplier in China, we can help you delivery the chiller machine to your supplier in any city of China .

Why should you choose Tongwei for your custom explosion proof chiller supplier?

▪ Experience you can trust

We have been designing and building water chiller for over 15 years. From air cooled chiller to water cooled chillers and everything in between, we have built chillers for nearly every industry and every application.

▪ Fast Quote

Get a quote for your project today! We typically provide a custom quote within 2 hours.

▪ 24/7 customer service

Believe that we will always be by your side. Whether you have a question or need a quote, there‘s always someone answering the phone 24 hours a day.

▪ Durable and reliable machine

Our products are manufactured from high quality materials and we offer a competitive warranty on all  industrial chillers.

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