Carrier 30HH - Manual (Page 43)

Carrier
INSTALLATION
30HH,HJ
MOISTURE AND LIQUID INDICATOR
The moisture-liquid indicator serves two pur­
poses. It shows that a sufficient charge of re­
frigerant is in the system when a clearflow of
liquid refrigerant can be seen in the indicator.
Bubbles in the flowing refrigerant indicate that
the unit is undercharged or the presence of non-
condensables.
The moisture-liquid indicator also provides a
constant check on the moisture in the system.
The presence of moisture in the system, will
be shown by a change of color of the indicator.
The
approximate moisture content is measured
in parts per million (PPM).
Color PPM - Moisture
Green Below 45
Chartreuse 45-130
(Caution)
Yellow (Wet) Above 130
At the first signs of moisture in the system, the
filter-drier should be changed.
IMPORTANT: With the machine run­
ning, the indicating element must be in
contact with the LIQUID refrigerant to
give a true moisture indication.
On units shipped from the factory with a holding
charge
only, the moisture-liquid indicator will
be in contact with vapor only. Under these con­
ditions the element may be in any one of three
colors and will not indicate the true moisture
content.
A chartreuse or yellow color under
these conditions does not indicate that the system
is wet. To determine the actual moisture con­
dition, the system should be running and com­
pletely charged.
i A
MOISTURE
INDICATOR
Fig. 42 - Moisture-Liquid Indicator
37