Drier; Liquid/Moisture Indicator - Daikin LXE10E-A14 Service Manual

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4.1.4 Drier

The drier automatically absorbs moisture in
the refrigerant while it is circulated. It also
commonly works as a filter to remove dust in
the refrigerant. Replace the drier if it does not
absorb moisture or if it is blocked. When
installing the new drier, follow the directions
given on the label and do not make any
mistake about the flow direction of the drier.
(1) Replacement procedure
q Conduct the automatic pump down to collect
the refrigerant in the liquid receiver.
Refer to page 4-18 and 4-19 for the automatic
pump down.
w Then, quickly replace the drier with a new one
after loosening the flare nuts on the inlet and
outlet side of the drier.
e When the flare nuts are loosened, if no sound
of gas refrigerant leakage is detected at the
flare nut section, then air mixing into the
refrigerant is suspected. In this case, conduct
vacuum-dehydrating from the quick joint
located at the inlet side of drier.
r After completing of the replacement of the
drier, be sure to conduct refrigerant leakage
test to confirm that no refrigerant leakage is
occuring.
t Check on the green colour of the liquid /
moisture indictor after system operation has
started.
y Adhere some anti-corrosion tape to the flare
nut section.
Quick joint
4.1.5 Liquid / Moisture indicator
(1) Moisture entering
The indicator indicates the moisture content by
the colour at the centre of the window.
Check this indicator while the unit is operating.
Note) 1. The indicator may appear yellow if it has
(2) Flow of refrigerant
When the moisture indicator is sealed with the
liquid, bubbles will disappear on the moisture
indicator.
Flare nut
Flare nut
4-4
This indicator permits checking of the flow of
refrigerant and moisture content in the
refrigerant.
Color
Green
Yellow Wet (moisture entered)
been exposed to gaseous refrigerant for a
long time.
2. The colour of the indicator must be
checked after operation of a few hours.
3. The indicator is influenced by the
temperature of the liquid refrigerant. At low
temperatures, a long time is required for
the indicator to change color.
4. To shorten the indication changing time,
raise the temperature of the liquid
refrigerant. (Block the air discharge grille
of the condenser fan to increase the
working pressure in order to raise the
temperature.)
If a lot of bubbles are observed during pull-
down and frozen operation, a refrigerant
shortage can be suspected.
Several bubbles may be generated soon after
the operation start and chilled operation.
However, it is not a refrigerant shortage.
Conclusion
Dry
Moisture
indicator