Bitzer Semi-hermetic Condensing Unit

Bitzer open-type condensing unit is a worldwide popular type condensing unit for cooling projects, Miracle can produce condensing unit with Bitzer Semi-hermetic compressor, screw compressor for different applications to meet your customized demand.

Horizontal Condensing Unit

Miracle supplies a horizontal condensing unit with Sanyo brand compressors. The horizontal rotary condensing unit has a smaller dimension, high efficiency, and low operation noise.

Parallel Refrigeration Unit

Miracle can supply parallel refrigeration units to meet your requirements for big cooling power and highly efficient for your cold room or any big project for buildings etc. The compressor can be specified as Bitzer and Frascold.

Copeland Condensing Unit Used for Walk-in Cooler

With the improvement of our life, freshness and frozen foods appear on the dining tables of every family.

This is because Copeland compressor packages provide a steady flow of power.

For the experience of our customers, the Copeland condensing unit is commonly used for

• walk-in cold storage.
• food cold room.
• mini cold room.
• medicine cold storage.
• seafood cold storage.

Copeland Condensing Unit Used for Commercial Refrigeration System

Recently years, with the growth of the cold chain industry, the major E-commerce companies are making every effort to deploy new retail, allowing freshness and frozen foods to appear on a larger scale.

Meanwhile, the market for the fresh and frozen food industry is gradually expanding.

This has led to an increase in the global demand for refrigeration compressor units.

Therefore, Copeland compressor units are not only used for cold storage projects, but also for refrigeration equipment in commercial buildings.

If fire is not available at your construction site, you can use the Miracle braze-freezer tool and fittings for installation.

After you get the Copeland air-cooled condensing unit, to achieve a good cooling function for it, choosing a good team to finish the installation is a very important process.

Traditionally, you will find a team to install it with the welding method.

But you may have the experience that an unprofessional team will cause many problems in the future.

Such as leaking, energy, and power-consuming, short of the Copeland condensing unit work life, and other small problems.

You may face the following two main concerns:

1. Welding will cause high temperatures and fire, which is very dangerous for people’s lives.

2. It is expensive for workers labor workers and it takes a long time for the whole installation work.

Here, Miracle provides you with a new connection method to solve all of your concerns above.

The new connection method, we call a solder-free connection or braze-free connection.

Because there is no need to use fire, it also can be called a fire connection.

As you know from the name, we don’t need a weld.

It uses crimping with a special lokring tool and through the interference fit between the metal pipes to ensure its tightness and good sealing.

This technology was used for the aerospace field in the 1960s and is very reliable.

You can check the following video to see how we use it.

Its advantages are no fire, no high temperature, very easy to operate, and very high efficiency.

With this, you can greatly save on the cost of installation.

For further info, please contact our team and get a professional guide.

Relate Product: HVAC parts, copper Y joint, insulated copper pipe, refrigeration valves.

We will provide reliable parts with our 30 years’ refrigeration manufacturer experience in choosing good quality parts.

For manufacturers, we can supply you with well-known brands (Danfoss, Emerson) as well as alternatives.

They include controllers, pressure vessels, compressors, refrigeration ball valves, sight glasses, check valves, expansion valves, solenoid valves, rotalock valves, etc.

Except for the refrigeration parts for the Copeland condensing unit.

We also supply the refrigeration tools that you will use during your installation work.

Such as pipe cutters, pipe benders, air conditioner tools, HVAC tools, pipe reamer, manifolds gauges, HVAC vacuum pump, HVAC flaring tool, lokring tool, and lokring fittings for solder-free connection, etc.

Miracle will try our best to make your business simple.

The Copeland scroll compressor is mainly composed of a moving disk (vortex revolver), static disk (vortex stator), bracket, Oldham coupling ring, back pressure cavity, and eccentric shaft;

The principle of the Copeland unit scroll compressor is that the scroll line of the moving plate and the static plate are the same.

But there is a phase difference of 180° to mesh, thereby forming a series of enclosed spaces;

When the static plate is not moving, the moving plate revolves around the fixed plate with the eccentricity as the radius.

During the revolving process of the moving plate, it successively meshes to continuously compress the crescent-shaped area.

To achieve the purpose of continuously compressing the gas, and then it is discharged from the center of the static plate;

Let’s see the advantages and disadvantages of Copeland scroll compressors, and you will know why the Copeland condensing unit is so popular all over the world.

What are the Advantages of Copeland Scroll Compressors?

√ The eccentric shaft that drives the moving plate can rotate at a high speed, and the Copeland unit scroll compressor is small in size and light in weight;

√ The force change of moving parts, such as the moving plate and the main shaft,t is small.

So the whole machine runs relatively smoothly, and there is almost no vibration;

√ The Copeland unit scroll compressor has strong adaptability in variable speed movement and frequency conversion speed regulation technology;

√ The Copeland unit scroll compressor makes very little noise when it is running;

√ The tightness of the Copeland scroll compressor is very good, and its refrigeration coefficient will increase slightly with the increase of operating time;

√ The Copeland scroll compressor works very well within the proper working conditions, especially in the heating working conditions of the heat pump air conditioning system;

√ The Copeland scroll compressor has no clearance volume, so it can maintain high volume efficiency operation;

√ The Copeland unit scroll compressor has few operating parts and no reciprocating operating structure.

So its reliability is very high, its life is very long, and it is easy to realize automation;

The Copeland condensing unit we can supply is:

• Open type Copeland condensing unit.
• Box-type Copeland condensing unit.
• Copeland air-cooled condensing unit.
• Copeland water-cooled condensing unit.
• Copeland outdoor condensing unit

A Copeland condensing unit is used in the walk-in cooler system and air conditioning system with a Copeland scroll compressor.

Miracle provides an R22 condensing unit and R404a condensing unit with high reliability, high efficiency, and low noise.

For more details, please contact us now.

Check whether there are obstacles in the transmission running parts and whether the protection device is in good condition.

Check whether the berth is normal for the compressor equipped with oil sight glass.

For freon refrigeration compressors equipped with oil heaters.

They should be energized and heated before starting to make the freon dissolved in the oil volatilize and the oil pump can work normally.

The heating time is subject to the regulations in the product manual.

The pressure gauge valve should be opened and observe whether the pressure is normal.

If the oil system is equipped with an oil three-way valve, make sure that the handle of the oil three-way valve is in the working position.

The compressor with an energy regulating device or unloading device should be set at the minimum load or no-load position.

The shaft seal should be checked for the open type.

If there is a valve in the return pipe of the mechanical shaft seal, the valve should be opened, and the gland of the packing shaft seal should be loosened slightly.

Check whether the opening and closing conditions of the manual valves on the refrigeration system pipeline are correct.

Check whether the safety valves, pressure gauges, liquid level indicators, and other front shut-off valves and pressure-equalizing valves on each device are open.

However, the filling valve, oil collector, and air discharge valve should be closed.

Check whether the refrigerant liquid level in the liquid receiver and other equipment is within the required range.

Check whether there are obstacles in the running parts of the water pump and fan and whether the motor and various equipment are normal.

For water-cooled condensers, open the condenser inlet and outlet valves.

The horizontal shell and tube condenser closes the drain valve and opens the breather valve.

Start the water pump, connect the power to the condenser and compressor water jacket, and crankcase the oil cooler.

Turn on the power and prepare to start.

Why is the Copeland Scroll AC Unit Compressor Called “Digital Scroll”?

The Copeland scroll ac unit compressor is alternately in two states, load state and unloads state.

In the load state, the compressor outputs at full capacity (1).

And in the unloaded state, the compressor has no output (0).

Because it changes between 1 and 0 in the set period, it is called a digital AC scroll.

How Much Energy Can the Copeland Digital Compressor Save?

For the modulation system, the Seasonal Energy Efficiency Ratio (SEER) is the standard measure of energy saving in operating the system throughout the year.

Compared with the seasonal energy efficiency ratio of the standard Copeland condensing unit scroll system, the Copeland condensing unit digital scroll system has increased by 20%.

Different system designs have slightly different actual energy savings figures, but conservatively speaking, the energy savings will exceed 20% compared to fixed-speed systems.

How Can the Copeland Digital Compressor Save Energy?

There are two factors for saving energy under partial load.

When operating under partial load, the Copeland scroll AC unit compressor runs for a period of time in an unloaded state.

The duration of the unloading state depends on the percentage of deflection.

The percentage of low deflection makes the unloading run longer.

In the unloaded state, the load on the scroll is very low (because there is no refrigerant suction), so little energy is consumed.

The test proves that the power consumption during unloading is only 10% of the full load power.

Low unloading power consumption saves energy in the part-load phase.

The second factor that contributes to operation under partial load is the wide operating range of the Copeland scroll AC unit compressor.

The capacity adjustment range of the Digital Scroll is 10-100%.

Therefore, even at a very low capacity (10%, 20%, 30%, etc.), the Copeland condensing unit compressor still does not require any hot gas bypass or on/off control.

The bypass will reduce the COP of the system, and because the Copeland condensing unit’s digital scroll does not require any bypass, it can save more energy.

The Copeland scroll ac unit operates in two states-load states and unloaded states.

The Copeland scroll ac compressor unit is equipped with an external solenoid valve.

When the solenoid valve receives a 220V signal, the top vortex moves up about 1 mm.

The movement of the top scroll creates a gap between the two scrolls, and there is no axial seal between the scrolls.

In this way, even if the motor is running, the compressor still cannot compress the refrigerant.

The capacity in the loaded state is 100%, and the capacity in the unloaded state is 0%.

The average output capacity of the compressor is the time average of the load state and the unloaded state.

For example, when the cycle time is 20 seconds, if the Copeland condensing unit digital scroll is loaded and unloaded for 10 seconds each, the time average capacity is 50%.

There are many advantages to the Copeland condensing unit digital scroll compressor:

A. The Copeland condensing unit digital scroll compressor system has the widest variable capacity range, reaching 10-100%.

The variable capacity range of the frequency converter system is often indicated by the frequency range of the compressor, which is generally 40-120 Hz.

After being transformed into the system, the variable capacity range is only 50-100%.

B. The Copeland condensing unit digital scroll compressor’s electronic device is very simple, so it is easier for the manufacturer to manufacture the Digital Scroll system.

C. The Copeland condensing unit’s digital scroll compressor has no electromagnetic interference problems.

D. Because the Copeland condensing unit Digital Scroll compressor has a wider range and stepless variable capacity output, the system has more precise room temperature control.

E. Because the overall system structure of the Copeland condensing unit Digital Scroll compressor is much simpler, the system’s reliability is improved.

F. The manufacturer only needs two digital control boards to develop a complete model series, one for a single compressor system and the other for a parallel/triple system.

System matching parameter requirements, basic performance requirements are the same as the single compressor unit system.

In the Copeland condensing unit parallel system, you should pay more attention to the oil return reliability of the system and the multi-line system.

Oil balance between compressors:

During the oil return process.

There should be no bias flow that causes the lubricating oil to accumulate in one or several compressors while other compressors are short of oil.

A filter screen should be installed at the oil return port.

Temperature and pressure protection switches should be set.

Maintaining the oil level is the most important issue.

In the Copeland condensing unit parallel scroll system.

Due to the difference between the compressor’s oil volume and the system’s oil return volume.

The long-term operation will cause the compressor’s oil level to change (one oil level decreases and the other oil level rises).

you can see the figure in the following:

When connecting Copeland condensing unit compressors A and B of the same model.

If the oil volume of compressor A is large and the oil return volume in the system should be small.

The oil level of A will continue to drop, and finally.

The Copeland condensing unit compressor will have almost no oil, resulting in poor lubrication and causing bearings to burn.

The oil volume of compressor B is small, and the oil return volume of the system is large.

The oil level of B will continue to rise, and finally, the motor rotor is almost immersed in the oil, which will cause the increasing situation in input power and temperature rise in various parts.

Solutions to the Oil Partiality of Parallel Scroll Unit

⦁ Connect the Copeland condensing unit scroll compressor with the same model or same capacity.

Try to balance the oil amount and oil return amount.

⦁ The components of each system should adopt the same shape.

Such as the compressor discharge pipe to the confluence part, and the branch part of the compressor suction pipe.

The two compressors should try to maintain the refrigerant flowing and oil flowing evenly.

⦁ In order to further suppress the oil amount in the system, an oil separator is designed on the exhaust pipe so that the lubricating oil that is separated into the two compressors returns to the refrigeration system.

⦁ Carry out oil equalization operation after parallel unit operation for a certain period of time.

The representative oil equalization operation method is to close or open both compressors in a limited time through the following sequence to correct the oil deviation, as shown in the figure below:

⦁ Stop a compressor B (OFF) for 2 minutes: the oil will move to the compressor A (ON) side through the oil equalization pipe.

⦁ Stop compressor A (OFF) for 2 minutes: the oil will move to the compressor B (ON) side through the oil equalization pipe.

⦁ Return to the original operating state Compressor A and Compressor B both return to the operating state (ON).

The Copeland condensing unit accumulator generally has two structures:

“One-in, one-out” structure refers to the main inlet pipe and the main outlet pipe and uses a three-way distributor or other distributors to connect the suction pipe of each compressor with the main pipe.

The advantages are: the structure of the Copeland condensing unit accumulator is simple, the manufacturing is convenient, and the versatility is good.

The disadvantage is that a three-way distributor is needed to connect the suction pipe of each compressor.

The splitting effect of the three-way directly affects the suction and oil return of each compressor, and the size of the oil return hole of the Copeland condensing unit accumulator is difficult to balance full open and minimum operation for the oil return.

“One-in, multiple-out” structure refers to one main inlet pipe and multiple outlet pipes.

The advantages are: the return air of each compressor is easier to be uniform, the size of the oil return hole of each pipe is only responsible for the return of oil from one compressor, and the impact on capacity adjustment is small.

In the case of blockage, it only affects one compressor, which is more reliable.

The disadvantages are complex processing technology, high precision requirements, consistent requirements for the size of each hole, and the installation height of the outlet pipe must be strictly controlled and consistent.

Miracle provides different types of accumulators, such as standard accumulators from 1/2 to 3 1/8, aand lso provides the Copeland condensing unit accumulator with a heat exchanger, liquid receiver, and suction accumulator with a heat exchanger.

If you need to know about the accumulator, click the pic to check the details.