Condensing units are different from air conditioning condensers, which generally have a temperature range of less than 0°C. The temperature range of an air conditioner outdoor condenser unit is 16°C.

Therefore, their internal structure is different, air conditioning outdoor condenser unit, using an electronic expansion valve, inverter compressor, four-way reversing valve, and other valve parts.

Refrigeration condenser units use thermal expansion valves, scroll compressors, semi-hermetic compressors, fixed-frequency compressors, check valves, etc.

Although they have the same appearance, the condenser unit parts are different.

You can learn more about air conditioning systems here.

There are three main types of condensing units.

• Air-cooled condensing unit
• Water-cooled condensing unit
• Evaporative Condensing Unit or Combined air and the water-cooled condensing unit

The type of compressor can be divided into the hermetic condensing unit, semi-hermetic condensing unit, and screw unit, etc.

According to the application environment can be divided into high high-temperature unit (freshness storage), medium medium-temperature condensing unit (cold room), and low low-temperature condensing unit (walk-in freezer).

You can learn more about what is condensing unit here.

An air-cooler condensing unit is used for small-capacity refrigeration condensing units such as walk-in coolers and freezers, plug-in condensing units, and commercial condensing units.

Therefore, the air-cooled condenser unit is small in size.

A water-cooled condensing unit uses a heat exchanger to expel the heat from the hot vaporized refrigerant and transfer the counter flow of cool water into an inner tube.

It is a way of using water to cool the temperature and is also a relatively efficient condensation method.

So, the water-cooled unit is large and has a greater cooling capacity.

In terms of structure, air-cooled condensing units have more parts and are therefore more prone to leaks or failures.

Water-cooled condensing units have fewer parts and are therefore less prone to leaks or failures.

The overall system of a water-cooled condensing unit is more complicated than an air-cooled condensing unit, but it’s more effective.

In terms of investment, the initial capital investment of a water-cooled unit is larger, while the initial capital investment of an air-cooled unit is smaller.

You can learn more about the Air-Cooler Condensing Unit and Water-Cooled Condensing Unit.

If you want to figure out how a condensing unit works, you need to know the refrigeration system and refrigeration cycle.

This cycle has four parts, compressor, condenser, expansion valve, and evaporator.

The responsibility of a condensing unit is to release the heat outside of the room that was absorbed by the evaporator from inside the room.

The evaporator discharges the heat in the cold storage room into the room under the action of refrigerant and axial fan. It works as a heat exchanger.

The function of the compressor is to provide power for the entire refrigeration system. The function of the expansion valve is to atomize the refrigerator.

The working principle of different HVACR systems is the same. The difference between them is that they use different components.

You should understand what is expansion valve, what is semi hermetic compressor(refrigeration system), what is a rotary compressor(AC system), and what a condenser and evaporator.

Then you can better understand how a condensing unit works.

If your condensing unit’s cooling capability is decreasing day by day. Then you should consider whether it is time to clean the condenser fins.

It can make your condensing unit more efficient to run. It is a good practice if you spray water on your condensing unit periodically to maintain a good performance.

When cleaning the condenser fins, you should follow the principle of starting from the top and then tilting it at 45°.
Do not use a high-pressure water gun to clean the fins at a 90° angle. This may cause a short circuit in the condenser unit.

The cleaning methods for different condenser units are different. If it is an outdoor condensing unit, you need to remove the outer shell first, and then clean the fins.

If it is a semi-enclosed condenser unit, you need to protect the electronic control system first, and then clean the condenser fins.

You can let us know your requirements to get your desired one.

The air-cooled condensing unit should be installed with heat dissipation in mind.

Therefore, air-cooled condensing units should not be installed in a confined space, and air circulation of air-cooled condensing units should be ensured.

A water-cooled condensing unit should be installed with the location of the water source, as well as the ambient temperature.

Factors such as moisture, water ingress, and winter weather conditions should be considered when installing a semi-closed unit.

Both semi-hermetic units and hermetic condensing units should be considered for adequate ventilation space.

Installation position – They can be installed above the cold storage, side.

Note: the condenser unit should be installed horizontally.

The condensing unit not level will lead to poor oil return of the compressor of the unit, which will increase the risk of dry friction of the compressor, aggravate the wear of the compressor, and increase the energy consumption of the refrigeration system.

When the condensing unit is installed, a level meter should be used to detect the level of the unit.

Solution: Miracle leveling pad can be used, by adjusting the height of the leveling pad to make the unit in a horizontal position.

If you need more details on installation, please contact us now.

There are many parts of a condensing unit, and each part is combined with the other in a cycle.

To ensure the best and most efficient performance for your condensing unit, you should focus on each part as standard and quality. They are

• Insulated Copper Pipe
• Filter Drier
• Compressor
• Reversing Valve
• Accumulator
• Refrigeration check valve
• Expansion valve
• Condenser and Evaporator
• Ball valve
• Solenoid valve
• Condenser coil
• Axial fan

Miracle refrigeration can provide high-quality components for transport refrigeration and rail transit systems.

It will provide an easy and valuable operating system for food cold storage, meat cold storage, walk-in coolers, mini cold storage, and freezers.

They include transport refrigeration oil separators, horizontal scroll compressors, condenser coils, vibration absorbers, refrigeration check valves, oil separators, liquid reservoirs, and expansion valves.

Miracle Refrigeration provides complete solutions for condensing units.

We can provide customized condensing units for your commercial refrigeration equipment, walk-in coolers, and freezers.

We can provide you with cost-effective condensing unit solutions, such as using Chinese-brand compressors, expansion valves, filters, oil separators, and solenoid valves.

And we provide warranty for the core components of the unit (such as compressors, evaporators, etc.).

In addition, our engineers can also meet your customized voltage needs.

Miracle always insists on providing you with the condensing unit suitable for your project. For more details, please contact us now.

We have experience of more than 30 years in the continuous development of condensing units, heat exchangers, refrigeration equipment, and others.

We have our laboratory to research, design, and develop the product for better refrigeration.

We have more than 20 patents on refrigeration and central air conditioning products.

All our products are ISO and other international inspection authority verified.

Support custom-specified condensing units for your projects.

Support English operation and installation manual for better access to installation support.

100% quality inspection, nitrogen pressure maintained before delivery.

With the improvement of people’s quality of life, people’s demand for refrigeration is also increasing.

The fresh milk we drink in the morning, the vegetables we eat, and cold drinks are all related to refrigeration, and preservation is closely related to our lives.

In exploring ways to preserve fresh food, humans have thought of almost all the methods they can think of, such as pickling, drying, etc.

But there is only one purpose, and that is to eat fresh food. Yes, refrigeration improves our quality of life and reduces food waste.

I am very happy that Miracle can become a member of the refrigeration industry and actively provide solutions for the food safety of millions of households.

Miracle will continue to contribute wisdom and strength to the development of the refrigeration industry together with people of all ethnic groups all over the world.

Miracle condensing unit can be used for food cold room, medicine cold room, freezer, supermarket refrigeration, etc.

If you have any condensing unit needs, please contact us now.

Maybe you are worried about:

• What is the delivery time of the condenser unit?
• What time to place the order for the condenser units?
• How is the package of the condensing unit?

No worriers. We will provide you with accurate answers to all of these.

The service will be divided into 2 parts, Pre-sale service, and after-sale service.

Pre-sale is solving the problem of ordering the condenser units.

After-sales is taking care of all the things after you place the order, production, package, delivery, and quality guarantee.

Pre-sale: When you send inquiries, our sales manager will contact you to learn everything about your projects and requirements in a highly efficient way.

And there will be clear and detailed notes when the communication finishes until all are settled and the order confirmed.

After-sale: The sales manager will keep you informed of the production status with photos or videos, make sure you can check them any time you want, and ensure the promised delivery time.

We will contact you for a booking container and arrange a vessel or plane at least one week before the condensing unit is ready.

When the condensing units are ready, the sales manager will show you all the photos or videos for the complete condensing unit, package, and even how we load the container.

Then we take care of the clearance on our side and send them out smoothly with the experienced forwarder’s help.

If you are not professional about this, we can take care of clearance on your side also.

When you get the goods, we will also guide your installation and will be here to support any problem you meet until the condensing unit is running well.

The sales will be always there to provide your service.

The type of refrigerant determines the cooling capacity of the condenser unit

You need to consider the refrigerants because different refrigerants are used in units with different cooling capacities.

You need according to ambient temperature and storage temperature to calculate the cooling capacity.

And according to the compressor’s ability to choose the refrigerant for your project.

Please see here the evaporation temperatures and performance of different types of refrigerants.

For example, r22 refrigerant, r134a refrigerant, r32 refrigerant, r290 refrigerant, r404a refrigerant, r407c refrigerant, r410a refrigerant, etc.

If you need, please read more about R22 condensing unit, R410a condensing unit, and R404a condensing unit.

1. Scroll Compressor(scroll condensing unit)

The refrigeration scroll compressor capacity is less than 60KW.

Advantages of a scroll compressor:

The scroll compressor has low noise, small size, high heating performance, good stability, and high safety.

It is suitable for variable speed movement and frequency conversion technology.

The scroll compressor is mostly used in medium-temperature refrigeration equipment.

2. Semi-hermetic Refrigeration Compressor

The cooling capacity of the semi-hermetic refrigeration compressor can reach 60～600KW.

Advantages of a piston compressor:

Piston compressors can adapt to a wide range of pressures and can reach the required pressure regardless of the flow rate.

The piston compressor has high thermal efficiency, strong adaptability, wide exhaust range, and is not affected by the pressure level, and can adapt to a wider pressure range and cooling capacity requirements.

At the same time, the maintainability of the piston compressor is strong, and the technology is more mature.

It can be used in various commercial units, medium, and low-temperature cold storage refrigeration units.

Miracle offers Bitzer air-cooled condensing units and Bitzer water-cooled condensing units to choose from.

3. Screws Compressor

The cooling capacity of the screw refrigeration compressor is 100～1200KW.

Advantages of screws compressor:

The screw compressor is a simple structure, has few wearing parts, has low exhaust temperature, and can work under a large pressure difference or pressure ratio.

It is not sensitive to a large amount of lubricating oil contained in the refrigerant and has good airflow regulation characteristics.

It can be used in large and medium-sized air conditioners and cold storage refrigeration equipment.

In recent years, in addition to the continuous improvement of its own performance, the compressor.

As the core component of the refrigeration system, has been researched and developed around the two major themes of environmental protection and energy-saving, mainly including the following technical developments.

1. Application of frequency conversion technology and digital scroll technology

The compressor stepless continuously adjusts the capacity, which can better match the load changes of the refrigeration unit, and effectively improve the operating efficiency and adaptability of the unit under all working conditions.

Variable-frequency rolling piston compressors and scroll compressors have been widely used in various air-conditioning units.

At present, variable-frequency technology is expanding its application to the piston, screw, and even centrifugal compressors.

At the same time, the proportion of digital scroll compressors with stepless continuous variable capacity in multi-unit air conditioning units is also increasing year by year.

2. The compressor adapts to a wider range of refrigerants CFCs and HCFC refrigerants, which have a destructive effect on the ozone layer, are phase-out substances stipulated by the Montreal Protocol.

They have been gradually replaced by HFCs and natural refrigerants in the late 1980s.

In order to adapt to alternative refrigerants, the compressor has been greatly improved in technology and HFC refrigerant compressors.

Such as R134a, R404A, R407C, and R410A, and HC refrigerant compressors such as R600a and R290 have been developed.

Compressors for CO2 transcritical cycles have been successfully used in automobile air conditioners and heat pump water heaters, ordinary CO2 compressors, and NH3 cascade systems are being used in commercial refrigeration, and closed NH3 compressors are being used in air conditioners and refrigerators.

3. Economizer air supplement and single multi-stage compression Economizers are often used in secondary air screw compressor refrigeration systems.

Under working conditions with relatively low evaporation temperatures (below -25°C), the efficiency of ordinary single-stage screw compressors decreases, the cooling capacity decreases and the exhaust temperature is higher.

Use the economizer to do the air supply cycle, which can improve the efficiency of the single-stage screw compression refrigeration cycle, increase the refrigeration capacity, and reduce the compressor discharge temperature.

The use of an economizer can make the application range of single-stage screw compressors wider and more economical.

The temperature difference between condensation and evaporating temperature of the single-stage compression refrigeration system is 40-60℃ in normal operation, and the temperature difference can reach 75℃ in deep cold and low-temperature air source heat pumps.

To enable a single compressor to produce a larger temperature difference, economizer air supplement (EVI) screw compressors and scroll compressors have emerged, and air supplement piston compressors and rolling piston compressors have also been made new research breakthroughs.

Multi-cylinder piston compressors with single-unit two-stage compression are more and more common in refrigeration equipment.

Two-cylinder rolling piston compressors with single-unit two-stage compression have been successfully developed and applied.

The centrifugal compressor with single three-stage compression is already a symbol of high energy efficiency.

4. Expand capacity range and application areas

The longest and most adaptable reciprocating piston compressor is a general-purpose model with a wide range of capacities.

It continues to dominate in the refrigerator and commercial refrigeration fields but is challenged by rolling pistons, scroll, and screw compressors in the air conditioning field.

The compact centrifugal compressor with magnetic suspension bearing is a highly mechatronic product. It has been applied to chillers, and the capacity of screw compressors has begun to overlap.

Large-scale scroll compressors and hermetic screw compressors have been mass-produced, and the two have been connected to incapacity.

The output of scroll compressors for refrigeration has continued to increase, and three-screw compressors have also begun to be put on the market.

The capacity range of the rolling piston compressor has been expanded up to 14hp and down to 1/8hp.

In order to solve the problems of leakage and wear after using the R410A refrigerant, the research on the deformation structure of the rolling piston compressor opens a new direction.

Mostly the compressor does not start, the motor and electrical control should be checked. When overhauling, it is necessary to check all kinds of electrical control components, as well as power supply and connection lines.

1. Power line fault analysis: If the condensing unit does not start, generally check the power line first, such as if the power fuse is blown or the wiring is loose, the disconnection causes a phase loss, or the power supply voltage is too low.

Solution: When the power supply lacks phase, the motor emits a “humming” hum and does not start.

If the time is longer, the thermal relay will act and the contact will open.

The AC voltage block of a multimeter can be used to check whether the fuse is blown or measure the voltage of the electrical. If the fuse is blown, replace the fuse with an appropriate capacity.

2. Fault analysis of motor burnt out or inter-turn short circuit

When the motor winding is burnt out or short-circuited, the fuse often blows repeatedly, especially when the knife switch is pushed on.

For the open condensing unit, the motor can smell burnt enameled wire from the inside at this time.

Solution: Use a multimeter to check whether the motor terminal and the shell are short-circuited, and measure the resistance of each phase.

If it is short-circuited or a phase resistance is small, it means that the winding is short-circuited. Replace the motor.

3. Failure analysis of temperature controller

The leakage of refrigerant in the temperature sensor bulb of the thermostat or malfunction of the thermostat causes the contact to be normally open.

Solution: Turn the thermostat knob to see if it can start the compressor at a certain temperature.

If it can’t start, check if there is any leakage of the refrigerant in the temperature sensing bulb, whether the contact action fails, etc., a minor problem can be repaired, but the serious problem should be replaced with a new thermostat of the same model and specification.

4. Failure analysis of pressure controller:

When the pressure value of the pressure controller is improperly adjusted or the spring and other components in the pressure controller fail, the normally closed contact will be disconnected within the normal pressure range, and the compressor will not start.

Solution: The cover of the box can be disassembled to see whether the contacts can be closed, or a multimeter can be used to test whether it is connected.

If the compressor still cannot start after a manual reset, check whether the pressure of the system is too high or too low.

If the pressure is normal and the pressure controller trips, readjust the high and low-pressure control range of the pressure controller or replace the pressure control device.

5. Failure analysis of AC contactor or intermediate relay:

Generally, the contacts are prone to overheating, burning, abrasion, etc., causing poor contact.

Solution: Remove, repair, or replace the contactor.

6. Fault analysis of thermal relay

The contact of the thermal relay trips or the heating resistance wire is blown.

Solution: When the thermal relay contact trips, first check whether the setting current is appropriate, and press the manual reset button.

If the compressor does not trip after starting the compressor, you should find out the cause of the overcurrent, and then press the reset button again after repairing. When the heating resistance wire is broken, the thermal relay should be replaced.

How to solve the problem of high exhaust temperature of condensing unit

The high exhaust temperature of the refrigeration compressor unit is mainly analyzed from the following aspects:

• 1. The coolant level of the condensing unit is too low.
• 2. The oil cooler is dirty and the oil filter core is blocked.
• 3. The temperature control valve is faulty.
• 4. The oil cut-off solenoid valve is not energized the coil is damaged, and the oil cut-off solenoid valve diaphragm is broken or aging.
• 5. The fan motor is faulty and the cooling fan is damaged.
• 6. The exhaust duct is not unblocked or the exhaust resistance is large.
• 7. The ambient temperature exceeds the specified range.
• 8. Whether the temperature sensor is faulty, whether the pressure gauge is faulty.

How to solve the problem of Low Pressure

The low pressure of the condensing unit is mainly analyzed from the following aspects:

• 1. The actual air consumption is greater than the output air volume of the condensing unit.
• 2. Check whether the exhaust valve, intake valve, hydraulic cylinder, and load solenoid valve are malfunctioning.
• 3. Check whether the minimum pressure valve is stuck and whether there is leakage in your pipe network.
• 4. The pressure setting should not be too low. At the same time, check whether the pressure sensor, pressure gauge, pressure switch, or pressure sensor are malfunctioning and whether the pressure gauge input hose is leaking.

If you have a project, provide us with your room size, the temperature you need to achieve, the ambient temperature of your place, what kind of products you will store, compressor brand, voltage and frequency, etc.

We can meet your inquiry about semi-hermetic compressor units, scroll compressor units, screw compressor units, air-cooled condensing units, and water-cooled condensing units.

So if you have any requests for your projects, talk to us, and we provide the solution for you.