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4-21
●
Replacement of fusible plug
If pressure rises abnormally in the refrigeration
circuit, the fusible plug is automatically
activated, so, thoroughly check the possible
causes if the fusible plug melts.
If the fusible plug is activated, the fusible alloy
q
melts and refrigerant blow out (Melting
point: 95˚C ~100˚C).
For replacement,
q
-
e
shall be replaced.
4.2.14 Fusible plug
Receiver
Fusible plug
w
Cap
e
Body
q
Alloy
Color
Conclusion
Green
Dry
Yellow
Wet (moisture entered)
Note) 1. The indicator may appear yellow if it has
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.)
(2) Flow of refrigerant
When the moisture indicator is sealed with the
liquid, bubbles will disappear on the moisture
indicator.
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.
4.2.15 Liquid / Moisture indicator
This indicator permits checking of the flow of
refrigerant and moisture content in the
refrigerant.
(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.
Moisture
indicator
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