Compressor Application Manual
79Pages

This manual may not be reproduced in whole or partwithout prior permission from EMBRACO. >

Filter drierSuperheatedrefrigerant fluidin gaseous form(high pressure) Refrigerant fluid inliquidand/or blendedformMainevaporator Cold plate orSecondary evaporatorCondenserSuction lineRefrigerant fluid ingaseous form (low pressure)Capillary tube Compressor Figure 1 - Operation of a basic refrigeration system Discharge line > 4 Compressor Application Manual >

The compressor is a very important item in therefrigeration circuit. Its function is to circulate the refrigerant fluid inside the circuit. > The choice of a compressor for certain refrigerationequipment depends on the following factors: 1.1 - Control Device As mentioned above, every refrigerationsystem needs a control device. This may be an expansion valve or capillary tube.In capillary-equipped circuits, thepressures 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...

The compressor motors appropriate forthese two systems are called:LST Low Starting Torqueused in capillary systems.HST ֖ High Starting Torque, used inexpansion valve systems. > ClassificationControlSystemExample ofApplication CompressorsIndicated All EmbracocompressorsHSTExpansion valve(or Capillary)Onlycompressors withthe letter X in thecode of model Refrigerators, freezersand drinking fountains LSTCapillary Commercial foodcounters, softdrink machines,Refrigeratedfood counters anddisplays andwalk-in refrigerators e.g.: FFI 12BX,FFI 12HBX etc... 1.2 - Evaporation temperature HST compressors...

? Dehumidifier that works at an evaporatortemperature of over 0 > o C (32 > o F).Heat absorption by the refrigerant willdepend on the evaporator temperature.A certain pressure corresponds to acertain 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, 0 > o C(32 > o F), the pressure and density willincrease and more heat will be absorbed.For this reason, we can conclude thatthe work required by the motor in acompressor for...

F to +59 F)Freezers &RefrigeratorsRefrigerated foodcounters and drinkingfountainsDehumidifiers, soft drinkmachines and drinkingfountains > Compressor Application Manual > 9 size="-1">

To facilitate identification, there arespecial labels on the compressor informing the refrigerant fluid used. Since September 1997, Embraco hasapproved some refrigerant blends to be used in its compressors and only those with the respective label will be suitable for the blends.The blends approved to beused in the Embraco compressors are FX 56, MP 39, MP 66 and ISCEON 49. > Figure 2 - Compressor labelFigure 3 - Compressor label forR 600a refrigerant fluidFigure 4 - Compressor label for R 134arefrigerant fluid Figure 5 - Label for Compressors that can use blends Attention > Blends approved...

Before changing any part of the refrigerationsystem, the good refrigeration professional undertakes a full diagnosis to identify the real cause of the problem.The following table shows the most frequent failuresin a refrigeration system and their possible causes. For each problem presented, you will find itspossible causes marked with a ( ? ). The problemsare listed in the upperpart of the table. Follow thearrows and you will find a ( ? ) on each possiblecause. 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...

The refrigerator refrigerates too much(1st column in Table of Main RefrigeratorProblems - Part 1). POSSIBLE CAUSE Wrong connection in connection box(first ( ? ) in 1st column). STEPS Item 2.2. When looking for this item in theManual you will find:Check the connections with the help ofthe refrigerator's electrical diagram. If the connections are correct, go back to the table and you will find another ( ? ) in the1st column.This will be another possible cause of theproblem:Thermostat does not switch off. You willfind the step to take in the same line (item 4.3). Look in the Manual under this...

EXCESSIVE REFRIGERATIONINSUFFICIENT REFRIGERATIONELECTRICAL SHOCKNOISESEXTERNAL SWEATING OF THE CABINETINTERNAL SWEATING OF THE CABINETHIGH POWER CONSUMPTIONDOES NOT WORK COMPRESSOR DOES NOT SWITCH ON/OVERLOAD PROTECTOR NOT WORKINGDOES NOT WORK COMPRESSOR DOES NOT SWITCH ON/OVERLOAD PROTECTOR WORKINGDOES NOT WORK COMPRESSOR SWITCHES ON/OVERLOAD PROTECTOR WORKING See item in Chap. IV No voltage at power supplyVery low voltage at power supplyVery high voltageInterrupted electric cable or wiringWrong connection at the terminal boardWiring or electrical components touchingmetal partsElectrical...

EXCESSIVE REFRIGERATIONINSUFFICIENT REFRIGERATIONELECTRIC SHOCKNOISESEXTERNAL SWEATING OF THE CABINETINTERNAL SWEATING OF THE CABINETHIGH POWER CONSUMPTIONDOES NOT WORK COMPRESSOR DOES NOT SWITCH ON/OVERLOAD PROTECTOR NOT WORKINGDOES NOT WORK COMPRESSOR DOES NOT SWITCH ON/OVERLOAD PROTECTOR WORKINGDOES NOT WORK COMPRESSOR SWITCHES ON/OVERLOAD PROTECTOR WORKING See item in Chap. IV Condenser improperly fixed - metal tubes touching8.1Partial blockage in tubes8.2Capillary blockage due to water / wax / paraffin8.3Dirty/covered condenser or no air circulation8.4Incorrect leveling of refrigerator...

1.1 - Voltage 1.1.1 - No voltage at power supply 1.1.3 - Very high voltage Check using a voltmeter or testlamp. To eliminate the problem ofvoltages above 132 V (115 V nominal) and 240 V (220 V nominal) we recommend the use of a voltage stabilizer. 1.1.2 - Very low voltage at power supply To eliminate problems of voltagesbelow 103 V (115 V nominal) and 198 V (220 V nominal), at the end of the Manual we recommend the use of a voltage stabilizer. When the compressor does not start, the problem can be solved most often by using the right starting capacitor. > 2.1 - Interrupted electric cable or...