20
C6.2.19/0507-0708/E
If the moisture content of the oil in a refrigeration system reaches unacceptably high levels,
corrosion and copper plating may occur. The system should be evacuated down to 0.3 mbar or
lower. If there is uncertainty as to the moisture content in the system, an oil sample should be
taken and tested for moisture. Sight glass/moisture indicators currently available can be used
with the HFC refrigerants and lubricants; however, the moisture indicator will just show the
moisture contents of the refrigerant. The actual moisture level of POE would be higher than the
sight glass indicates. This is due to the high hygroscopicity of the POE oil. To determine the
actual moisture content of the lubricant, samples have to be taken from the system and
analysed.
6.5
Unbrazing system components
WARNING
Explosive flame! Burning!
Oil-refrigerant mixtures are highly flammable.
Remove all refrigerant before opening the system. Avoid working with an
unshielded flame in a refrigerant charged system.
Before opening up a system it is important to remove all refrigerant from both the high and low
sides of the system. If the refrigerant charge is removed from a scroll-equipped unit from the
high side only, it is possible for the scrolls to seal, preventing pressure equalization through the
compressor. This may leave the low side shell and suction line tubing pressurized. If a brazing
torch is then applied to the low side while the low side shell and suction line contain pressure,
the pressurized refrigerant and oil mixture could ignite when it escapes and contacts the brazing
flame. To prevent this occurrence, it is important to check both the high and low sides with
manifold gauges before unbrazing. Instructions should be provided in appropriate product
literature and assembly (line repair) areas. If compressor removal is required, the compressor
should be cut out of system rather than unbrazed.
7
Dismantling & disposal
Removing oil and refrigerant:
Do not disperse in the environment.
Use the correct equipment and method of removal.
Dispose of oil and refrigerant properly.
Dispose of compressor properly.
Summary of Contents for Copeland Scroll ZP23K Series
Page 24: ... ...
