GVZC20 Service Manual
SERVICING
26
NOTE: The Flushing Method using R-11 refrigerant is no
longer approved by Daikin Brand Heating-Cooling.
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 preven-
tative. The recommended location of the lter drier is be-
fore the expansion device at the indoor unit. The liquid line
must be insulated if more han 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 tempera-
ture inside the conditioned space may reach a temperature
lower than ambient in heating mode. FVC oils maintain a
consistent viscosity over a large temperature range which
aids in the oil return to the compressor; however, there will
be some installations which require oil return traps. These
installations should be avoided 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.