SERVICING
18
Now determine if a burn out has actually occurred. Conrm
by analyzing an oil sample using a Sporlan Acid Test Kit,
AK-3 or its equivalent.
Remove the compressor and obtain an oil sample from the
suction stub. If the oil is not acidic, either a burnout has not
occurred or the burnout is so mild that a complete clean-up
is not necessary.
If acid level is unacceptable, the system must be cleaned
by using the clean-up drier method.
NOTE: The Flushing Method using R-11 refrigerant is no
longer approved by the Manufacturer.
The piping of a refrigeration system is very important in
relation to system capacity, proper oil return to compressor,
pumping rate of compressor and cooling performance of
the evaporator. A bi-ow lter drier must be brazed on by
the installer onsite. Ensure the bi-ow lter drier pain nish
is intact after brazing. If the paint of the steel lter drier
has been burned or chipped, repaint or treat with a rust
preventative. The recommended location of the lter drier
is before the electronic expansion valve at the indoor unit.
The liquid line must be insulated if more than 50 ft. of liquid
line will pass through an area that may reach temperatures
of 30° F of higher than ambient in cooling mode and/or if
the temperature inside the conditioned space may reach a
temperature lower than ambient in heating mode.
FVC50K oils maintain a consistent viscosity over a large
temperature range which aids in the oil return to the com-
pressor; however, there will be some installations which
require oil return traps. These installations should be avoid-
ed whenever possible, as adding oil traps to the refrigerant
lines also increases the opportunity for debris and moisture
to be introduced into the system.
Avoid long running traps in horizontal suction line.
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