Carrier 38XTZ 007-024 Installation, Operation And Maintenance Instructions

372 kg or 3 kgLegend1 Pulleys2 Motor and fan shafts must be parallel3 Straight-edge must be parallel with beltFig. 50- Lubrication: Both the motors and the fans have factory-lubricated and sealed bearings, and need no furtherlubrication.The compressor has its own oil supply, including theamount for the siphons and refrigerant lines. Oil shouldnot be added unless a leak has occurred. Always use oil ofthe same brand and type that was used for the originalcharge.Servicing recommendations- Before replacing any of the elements in the cooling circuit,ensure that the entire refrigerant charge is removed fromboth the high and low pressure sides of the unit.- The control elements of the cooling system are highlysensitive. If they need to be replaced, care should be takennot to overheat them with blowlamps whilst soldering. Adamp cloth should be wrapped around the component to besoldered, and the flame directed away from the componentbody.- Silver alloy soldering rods should always be used.- If the total unit gas charge has to be replaced, the quantityshould correspond to the original unit gas and liquidcharge, plus the required charge for the refrigerant lines.The unit should be properly evacuated beforehand.- During unit operation all panels should be in place,including the electrical box access panel.- If it is necessary to cut the lines of the refrigerant circuit,tube cutters should always be used and never tools whichproduce burrs. All refrigerant circuit tubing should be ofcopper, specially made for refrigeration purposes.Compressor replacementNOTE: This operation must be done by a qualifiedtechnician.When an internal fault occurs, the compressor must bereplaced. This must be done as detailed below:- Disconnect the unit from the electrical supply.- Remove the panels.- Remove the gas from the refrigerant circuit using recoveryequipment to avoid harming the atmosphere.- Electrically disconnect the compressor.- Unbraze or unscrew the suction and discharge lines, takingcare not to damage the rest of the components.- Remove the fastenings from the compressor.- Replace the compressor, ensuring that it containssufficient oil.- Check if the oil of the defective compressor contains anyacidity from burnt-out windings.- If the oil contains acid, this will also be present in therefrigerant circuit. All the acid must be removed from therefrigerant circuit, otherwise the new compressor will alsobe damaged. In order to remove the acid proceed asfollows:a) Thoroughly clean the refrigerant circuit using drynitrogen in the opposite direction to the refrigerantflow.Also carefully clean the separate parts of therefrigerant circuit.Install anti-acid filters in the liquid line. Solder therefrigerant lines. Evacuate the lines and charge themwith refrigerant. Operate the unit for some time.Remove the oil and check the acidity.If there is still acid present, repeat the steps aboveseveral times, until no acid exists.b) If you do not want to carry out the proceduredescribed under (a), introduce an anti-acid substanceinto the refrigerant circuit, if the refrigerant linelength is short.c) It is also possible to install an anti-acid filter in thesuction lines.d) Analyse the refrigerant circuit acidity several timesand replace the filters several times until no acidityexists.e) Remove the filter from the liquid line in the 38XTZunits. Install a new filter when no acid remains inthe circuit.- Once the defective compressor has been replaced by a newone and the oil has been analysed, proceed as follows:- Braze or screw in the lines.- Install a new filter in the liquid line of the 38XTZunits.- Connect the compressor according to the wiringdiagram.- Evacuate the compressor.- Carry out a leak test. Repair any leaks detected.- Fill the refrigerant charge indicated on the nameplate,plus the required charge for the refrigerant connectionlines.

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