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Embed Size px x x x x IndexPage I. Refrigeration circuit Hermetic compressor Diagnosing the problem Procedure for changing the hermetic compressor Further important recommendations Further information IntroductionDear refrigeration professional! Since its incorporation in March , Embraco has been doing its utmost to keep an ever closer relationship with its customers.
This relationship has been translated in its commitment to continuously provide timely technical information that contributes further to the professional knowhow of our refrigeration professional partners.
The purpose of this Manual is to facilitate your work. It is a valuable aid to solving problems in the refrigeration system. You will find that you rarely need to change a hermetic compressor. Generally the faults are in other parts of the system. If, however, you do need to substitute the compressor, this Manual will help you do so step by step, even if you do not have all the equipment.
The Manual also gives some tips on how to prolong the working life of the hermetic compressor. The information is easy to understand and useful. Always keep this Manual in your pocket. Wishing you success in your work For further information, consult our site on the Internet, at the following address www. Compressor Application Manual3. The following figure shows you the essential components for the operation of most refrigeration circuits.
Suction line Superheated refrigerant fluid in gaseous form high pressure Refrigerant fluid in gaseous form low pressure Capillary tube Compressor. We will show below how a basic refrigeration system works: The compressor draws in the refrigerant fluid from the evaporator by reducing the pressure in this component. The fluid is compressed by the compressor and moves to the condenser.
In the condenser the refrigerant fluid under high pressure releases heat to the environment and becomes liquid. The next component of the circuit is the control device, which may be a capillary tube or an expansion valve.
The control element reduces the pressure of the liquid refrigerant which was formed in the condenser. This drop in pressure permits the refrigerant to evaporate at low temperatures and return to the gaseous state when passing through the evaporator.
The change from a liquid to gaseous state requires heat. So the refrigerant fluid removes the heat from inside the refrigeration system through the evaporator. The condenser releases this heat into the environment. The control element offers a certain resistance against the refrigerant's circulation, separating the high pressure condenser from the low pressure evaporator side. The refrigeration system also uses a filter drier with desiccant to retain any water that may be left in the system.
The oil cooling tube that exists in some compressors is used to help reduce the compressor temperature. Lastly, there are systems that use a suction accumulator to evaporate any residual liquid refrigerant, stopping it from returning through the suction line. Compressor Application Manual5. The compressor is a very important item in the refrigeration circuit. Its function is to circulate the refrigerant fluid inside the circuit. This may be an expansion valve or capillary tube. In capillary-equipped circuits, the pressures on the suction and discharge sides are equal when the compressor is stopped.
In this kind of circuit, the compressor is equipped with a low starting torque motor. In an expansion valve circuit, however, refrigerant only flows through the valve when the compressor is switched on.
So, the pressure between the suction and discharge are not equal when the compressor is stopped. In this case, the compressor is equipped with a high starting torque motor. The compressor motors appropriate for these two systems are called: LST Low Starting Torque used in capillary systems.
Commercial food counters, soft drink machines, Refrigerated food counters and displays and walk-in refrigerators. HST compressors may be used in systems using LST capillary tube compressors when the off cycles are shorter, not permitting equal equalized pressures.
However, LST compressors cannot be used in expansion valve systems. We now point out two extreme situations: Freezers that work at low temperatures, varying between oC oF and oC oF. Compressor Application Manual7. Dehumidifier that works at an evaporator temperature of over 0oC 32oF. Heat absorption by the refrigerant will depend on the evaporator temperature.
A certain pressure corresponds to a certain temperature in the evaporator. The gas density is higher at low temperatures and, therefore, only a small quantity of heat may be absorbed during evaporation.
If there is evaporation at a higher temperature, for instance, 0oC 32oF , the pressure and density will increase and more heat will be absorbed. For this reason, we can conclude that the work required by the motor in a compressor for a high evaporation temperature will be more than that required by the same compressor at a low evaporation temperature. Consequently, motors to be used in high evaporation pressure systems must have a higher operating torque.
Depending on what kind of compressor model is involved, it may be used in a range from the LBP to HBP classification see following table.
When choosing the replacement model, it is very important to check the class of the original compressor. As you know, the compressor's operating conditions can vary according to each design. These compressors differ from each other inside motor, pump, oil type, displacement, etc. To facilitate identification, there are special labels on the compressor informing the refrigerant fluid used.
Since September , Embraco has approved some refrigerant blends to be used in its compressors and only those with the respective label will be Attention suitable for the blends. Before changing any part of the refrigeration system, the good refrigeration professional undertakes a full diagnosis to identify the real cause of the problem.
The following table shows the most frequent failures in a refrigeration system and their possible causes. For each problem presented, you will find its possible causes marked with a. The problems are listed in the upper part of the table. Follow the arrows and you will find a on each possible cause.
In the same line as each cause you will find the number of the item related to the necessary actions to correct the problem. Look in. Home Documents Embraco. Post on Nov views. Category: Documents 13 download. Compressor Application Manual3 Refrigeration II Circuit The following figure shows you the essential components for the operation of most refrigeration circuits. HST or Capillary Commercial food counters, soft drink machines, Refrigerated food counters and displays and walk-in refrigerators HST compressors may be used in systems using LST capillary tube compressors when the off cycles are shorter, not permitting equal equalized pressures.
Compressor Application Manual7 Dehumidifier that works at an evaporator temperature of over 0oC 32oF. Compressor Application Manual 9 To facilitate identification, there are special labels on the compressor informing the refrigerant fluid used. III Figure 2 - Compressor label Figure 3 - Compressor label for R a refrigerant fluid Figure 4 - Compressor label for R a refrigerant fluid Since September , Embraco has approved some refrigerant blends to be used in its compressors and only those with the respective label will be Attention suitable for the blends.
Figure 5 - Label for Compressors that can use blends 10 Compressor Application Manual IV Diagnosingthe problem Before changing any part of the refrigeration system, the good refrigeration professional undertakes a full diagnosis to identify the real cause of the problem.
CATALOGO DE REMPLAZO_EMBRACO
Evaporating Evaporating Execution suitable for systems with a capillary tube and with balanced pressures at start up. Execution suitable Applications: Applications: HIGH for systems with expansion valve or capillary tube, with unbalanced pressures at start up. Ice makers, etc. Permanent Split Capacitor: No starting device.
COMPRESOR HERMÉTICO EMBRACO ASPERA NEU6214Z 5/8HP 220-240V 50/60HZ
Embed Size px x x x x IndexPage I. Refrigeration circuit Hermetic compressor Diagnosing the problem Procedure for changing the hermetic compressor