Unbrazing System Components; Dismantling & Disposal - Emerson Copeland Scroll ZRH49KJE Application Manuallines

7. Before replacing or returning a compressor, make certain the compressor is actually
defective. As a minimum, recheck a compressor returned from the field in the shop or
depot for Hipot failure, winding resistance, and ability to start before returning. More than
one third of compressors returned to Copeland for warranty analysis are determined to
have nothing found wrong. They were mis-diagnosed in the field as being defective.
Replacing working compressors unnecessarily costs everyone.
8. NEVER test a scroll compressor by closing the suction valve or the liquid feed to the
evaporator and pumping the compressor into a vacuum.
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 systems. 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 applying heat. 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 it in the environment.
Use the correct equipment and method of removal.
Dispose oil and refrigerant properly.
Dispose the compressor properly.
16 C6.2.7/0302-1007/E