Dehydration Fi Lter Repositioning; Oil Filter Repositioning - Trane CXAO Installation Operation & Maintenance

7.9 Dehydration fi lter repositioning
It is recommended the repositioning of fi lter cartridges Dryer
in the case of high pressure drop across the fi lter same or
in case with the value of the subcooling within the limits of
acceptability, occurs the passage of bubbles through the
sight glass.
It suggests the repositioning of the cartridges when the
pressure drop across the fi lter reaches 50 kPa with the
compressor at full load.
The cartridges must also be replaced when the humidity
indicator inside the sight glass changes color and highlight
excessive humidity, or the periodic oil analysis indicates the
presence of acidity (TAN excessive)
Repositioning Procedure
Ensure proper water fl ow through the evaporator
throughout the intervention period. The interruption of
the fl ow water during this procedure would result in the
freezing of the evaporator resulting in rupture of the its
internal pipes.
1. Switch off the compressor by turning the
corresponding switch in the Off
2. Wait until the compressor has stopped and close the
valve located on the liquid line
3. Start the compressor by turning the corresponding
switch to On
4. Verify on the display of the microprocessor, the
evaporation pressure corresponding.
5. When the vapor pressure reaches 100 kPa rotate the
switch again to switch off the compressor.
6. Once the compressor is stopped by putting a
label on the switch for starting the compressor
maintenance to prevent unwanted ignitions.
7. Close the suction valve of the compressor (if any)
8. With a recovery unit to remove the remaining
refrigerant from the fi lter of the liquid, until the
atmospheric pressure. The refrigerant must be stored
in a suitable container and clean.
To protect the environment, do not release the
refrigerant into the atmosphere removed. Always use a
device recovery and storage.
9. Balance the internal pressure with the outside by
pressing the vacuum valve installed on the the fi lter
cover.
10. Remove the cover from the fi lter drier.
11. Remove the fi lter elements.
12. Install the new fi lter elements within the fi lter.
13. Replace the cover gasket. Do not oil the fi lter gasket
with mineral oil to non-contamination in the circuit.
Use for this purpose only compatible oil (POE)
14. Close the fi lter cover
RF-SVX003A-GB
Dehydration fi lter repositioning
15. Connect the vacuum pump to the fi lter and evacuate
up to 230 Pa.
16. Close the valve on the vacuum pump.
17. Recharge the refrigerant recovered in the fi lter during
its emptying.
18. Open the valve on the liquid line
19. Open the suction valve (if any)
20. Start the compressor by turning the switch.
7.10

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 entering the compressor must be equal to that
removed and not the total amount to prevent an
excessive amount of oil in the subsequent starting.
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 fi lter 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
specifi cations.
The compressor oil fi lter 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 fi lter 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 fi lter repositioning please
contact the manufacturer.
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