28
AGL_HP_ST_YHK1E_E_Rev02
may occur when a scroll compressor is started in a vacuum causing burnout of the internal lead
connections.
6.6.3 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
solved 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 flush the entire system with dry nitrogen.
▪
Disassemble the compressor with a cutting tool. Drain and recover compressor oil properly. Flush
the compressor with dry nitrogen 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 shipment must be kept in the upright position
– mark it accordingly.
▪
If more than one compressor must be returned, each compressor must be packed individually.
NOTE: Check with your transport company that all the requirements that apply to such
shipments are complied with.
6.7
Lubrication and oil removal
WARNING
Air/flammable
refrigerant
mixture!
Flammable
and
explosive
atmosphere! Fire and explosion hazard!
Use suitable recovery unit and
recycling bottles also for oil disposal as A2L refrigerant may still be solved in
the oil.
CAUTION
Chemical reaction! Compressor destruction!
Do not mix up 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 for use with refrigerants R454C,
R1234yf, R513A, R134a and R407C is a polyolester (POE) lubricant Emkarate RL 32 3MAF. See
nameplate for original oil charge shown in litres. A field recharge is from 0.05 to 0.1 litre less.
One disadvantage of POE is that it is far more hygroscopic than mineral oil
– see
Figure 18
. Only
brief exposure to ambient air is needed for POE to absorb sufficient moisture to make it unacceptable
for use in a refrigeration system. Since POE holds moisture more readily than mineral oil it is more
difficult to remove it through the use of vacuum. 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-drier is installed in all POE systems. This will maintain the
moisture level in the oil to less than 50 ppm. If oil is charged into a system, it is recommended to use
POE with moisture content no higher than 50 ppm.
Summary of Contents for Copeland Scroll YH16K1E
Page 4: ...AGL_HP_ST_YHK1E_E_Rev02 9 References 33 DISCLAIMER 33 ...
Page 5: ......
Page 39: ...34 AGL_HP_ST_YHK1E_E_Rev02 ...
