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may occur when a scroll compressor is started in a vacuum causing burnout of the internal lead
connections.
6.5.3 Compressor return procedure
If a compressor has to be returned to the manufacturer for analysis, the refrigerant and the oil have
to be removed completely. For the shipping process, all compressor connections must remain open
and warning stickers for flammable refrigerant must be placed on the shipping box.
▪
During the entire working procedure continuously check if the ambient atmosphere is flammable.
If a flammable atmosphere is detected, ensure proper ventilation of the working space and
immediately cut-off the power supply.
▪
Resume working after the atmosphere is no longer dangerous.
▪
Recover the refrigerant from the system using a suitable recovery unit. During this action, the
compressor crankcase heater could be energized
– immediately de-energize in case a flammable
atmosphere is detected.
▪
Recover to 3 mbar absolute pressure or lower. For best results and to recover also the refrigerant
dissolved in the oil, run the recovery unit two or three times as necessary.
▪
Flush the whole system with oxygen-free dry nitrogen.
▪
Open the system with a cutting tool and purge the entire system with dry nitrogen.
▪
Disassemble the compressor with a cutting tool. Drain and recover compressor oil properly. Purge
the compressor with dry nitrogen again for a few minutes.
▪
The compressor should be returned free of oil and with connections open
– do not close
connections with plugs.
▪
Collect and secure the oil properly. Provide information about the quantity of oil drained from the
compressor and its colour. Ideally, send a good picture.
▪
Dispose of the oil according to local rules and regulations.
▪
Use a proper cardboard box package when preparing the compressor for shipment. Place
warning icons
on each side and on the top of the box. Mention the following message on
the box:
"Warning! Flammable A2L or A3 refrigerant compressor for analysis"
.
▪
The compressor must be kept in the horizontal position
– mark the box accordingly.
▪
If more than one compressor have to be returned, each compressor must be packed individually.
NOTE: Check with the transport company that all the requirements that apply to such
shipments are complied with.
6.6 Lubrication and oil removal
WARNING
Air/Flammable refrigerant mixture in a flammable or explosive
atmosphere! Fire and explosion hazard!
Use a suitable recovery unit and
recycling bottles also for oil disposal as A2L or A3 refrigerant may still be
dissolved in the oil.
CAUTION
Chemical reaction! Compressor destruction!
Do not mix ester oils with
mineral oil and/or alkyl benzene when used with chlorine-free (HFC)
refrigerants.
The compressor is supplied with an initial oil charge. The standard oil charge is RL 32 3MAF for
YRH(V)*KTE models and RLF 68EP for YRH(V)*KTG models. See nameplate for original oil charge
shown in litres. A field recharge is approximately 0.05 to 0.1 litre less.
Both POE polyolester oil and PAG polyalkylene glycol oil are hygroscopic. Only brief exposure to
ambient air is needed to absorb sufficient moisture to make it unacceptable for use in a refrigeration
system. Since POE and PAG oils hold moisture more readily than mineral oil it is more difficult to
remove it through the use of vacuum. In comparison with POE oil, PAG oil is even more hygroscopic.
However, in systems with PAG oil, the same measures to prevent moisture ingress and removal (for
example minimize the contact with air, use of appropriate vacuuming methods, use of a filter-dryer,
etc…) can be used as in systems with POE oil. The compressors supplied by Emerson contain oil
with low moisture content, which may rise during the system assembling process. Therefore, it is
recommended that a properly sized filter-dryer be installed in all POE/PAG systems. This will
