Oil Filter Repositioning - Trane CGCN Installation Operation & Maintenance

ARNING

Oil Filter repositioning

WARNING! The lubrication system is designed to maintain the majority of the charge of oil inside the compressor.
However, during operation, a limited amount of oil circulates freely within the system, transported from the
refrigerant. Therefore, the amount of oil to enter into the compressor will have to be equal to that removed and not
the total amount of plaque to prevent excessive amount of oil start next.
The measurement of the amount of oil removed from the compressor, must be carried out after leaving evaporate
the refrigerant contained in the oil itself for a period of time adequate. To minimize the content of refrigerant in the
oil, it is recommended to leave the heating elements on and to remove the oil when
the latter has reached a temperature of 35 ÷ 45 ° C.
WARNING! The repositioning of the oil filter requires special care in the preservation of the oil; being extremely
hygroscopic, it must not be exposed to air for a period exceeding 30 minutes. If in doubt, check the acidity of the
oil or, where such a measure to change the oil with another taken from sealed container or stored according to
manufacturer's specifications.
The compressor oil filter is located under the oil separator pressure side. It is recommended to reposition when its
pressure drop exceeds 2.0 bar. The pressure drop through the oil filter is given by difference between the
discharge pressure of the compressor less the oil pressure. Both of these pressures can be controlled by the
microprocessor for both compressors.
For more information about filter repositioning please contact the manufacturer.
Repositioning Procedure ARNIN
1) Turn off both compressors turning the switches in the off position
2) Turn the main switch OFF wait until the circulation pump and open the switch general to remove the power
supply to the unit.
3) Put a plate on the handle of the main switch to prevent accidental starting.
4) Close the valves of suction, discharge and liquid injection
5) Connect the recovery unit to recover the refrigerant compressor and within an adequate and clean
storage container.
6) Evacuate the refrigerant until the pressure inside has achieved a negative pressure (compared atmospheric
pressure). With this reduces to a minimum the amount of refrigerant dissolved in the oil.
7) Remove the oil contained in the compressor by opening the drain cock located below the engine
8) Remove the oil filter cover and remove the filter element inside
9) Replace the O-ring of the lid and the inner sleeve. Do not lubricate the O-ring with mineral oil to non-pollute the
system.
10) Insert the new filter element
11) Replace the lid of the filter and tighten the screws. The screws should be tightened alternately progressively
tightening torque 60Nm.
12) Load the oil from the top cap placed on the oil separator. Given the high hygroscopicity foreign oil, the oil
filling must be done in the shortest possible time. Do not leave the ester oil exposed to the atmosphere for a time
greater than 10 minutes.
13) Close the oil filler cap.
14) Connect the vacuum pump and evacuate the compressor up to a vacuum of 230 Pa.
15) On reaching the vacuum level predicted close the valve on the vacuum pump.
16) Open the valves, suction and liquid injection system
17) Disconnect the vacuum pump from the compressor.
18) Remove the plate WARNING located on the switch.
19) Close the main switch to power the unit
20) Start the unit according to the starting procedure described above.