LO
LO
HI
HI
REFRIGERANT
ASf11029
RECEIVER
REFRIGERANT
RECEIVER
A. CYLINDER UPRIGHT
B. CYLINDER INVERTED
Figure 11-29.--Connections for low-side charging.
A second function performed by the
9. Disconnect the hoses. Do this carefully, as
ST-100A/ST-1000 is to filter refrigerant. The unit
there will be trapped refrigerant in the lines.
accepts refrigerant from the external system in either
After charging with liquid refrigerant, run the
liquid or gas form, filters it, and then returns it as a
air-conditioner and observe the discharge pressure
liquid directly to the external system or to a separate
gauge to ensure system pressure does not exceed 365
storage tank to be reused (fig. 11-31). Operating
psi in the AIR-CONDITION mode. (Normal operating
instructions for the ST-100A/ST-1000 and system
pressure is 100 to 365 psi.) Also check the sight glass to
specifics can be found in Operational and Intermediate
ensure there are no bubbles present in the refrigerant. If
Maintenance Instructions with Illustrated Parts
bubbles are present, the system is not fully charged, and
Breakdown, Refrigerant Recovery-Recycle System,
you will have to add additional refrigerant by using the
ST-100/A-USN, ST-100, NAVAIR 19-60-91.
low-side charging method.
WARNING
Liquid and gaseous refrigerant is very cold and
can burn your hands if it comes in contact with your
skin. Be sure to wear gloves when handling
refrigerant.
Refrigerant Recovery-Recycle
Current regulations forbid venting refrigerant into
the atmosphere. Therefore, before opening a refrigerant
system, the system must be pumped down to secure the
refrigerant, and in some cases, its refrigerant must be
transferred to a separate container. For this purpose, the
Navy currently uses the ST-100A and ST-1000
refrigerant recovery-recycle systems. (See figure 11-30
and table 11-4.)
NOTE: Functionally, the two systems are virtually
identical. In the technical manual, the manufacturer
discusses the systems as though they were one and
ASf11030
refers to them as the ST-100A/ST-1000. We will do the
same.
Figure 11-30.--Refrigerant recovery-recycle units.
11-31
