Oil Additives; Unbrazing System Components; Dismantling & Disposal - Emerson Copeland 4MTL-05 Series Application Manuallines

a ref rigeration system reaches unacceptably high levels, corrosion and copper plating may occur.
The system should be evacuated down to an absolute pressure of 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 f or moisture. Sight glass/moisture indicators currently available can be used with natural
ref rigerants and lubricants. However, the moisture indicator will just show the moisture content of the
ref rigerant. The actual moisture level of POE would be higher than indicated by the sight glass. 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 f rom the system and analysed. The plug (1/4"-18 NPTF) that
should be used for oil removal is shown in Figure 41 below.
Figure 41: Oil removal plug location
6.4

Oil additives

Although Emerson cannot comment on any specific product, f rom our own testing and past
experience, we do not recommend the use of any additive to reduce compressor bearing losses or
f or any other purpose. Furthermore, the long-term chemical stability of any additive in the presence
of ref rigerant, low and high temperatures, and materials commonly found in ref rigeration systems is
complex and difficult to evaluate without rigorously controlled chemical laboratory testing. The use
of additives without adequate testing may result in malfunction or premature f ailure of components
in the system and, in specific cases, in voiding the warranty on the components .
6.5

Unbrazing system components

WARNING
Explosive flame! Fire hazard! Oil-refrigerant mixtures are highly flammable.
Remove all ref rigerant before opening the system. Avoid working with an
unshielded flame in a refrigerant-charged system.
Bef ore opening up a system it is important to remove all refrigerant from both the high and low sides
of the system. If a brazing torch is then applied to the low side while the low side shell and suction
line contain pressure, the pressurized ref rigerant and oil mixture c ould 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 in compliance with national legislation and
regulations.
Dispose of compressor in compliance with national legislation and regulations.
36 AGL_Stream_ST_4MTL_4MSL_EN_Rev02