TM 9-2320-280-34
This task covers:
a. Manifold Gauge Set Installation
e. Evacuating System
b. Manifold Gauge Set Removal
f. Charging System
c. Discharging System
g. Adding lubricating oil
d. Flushing System
INITIAL SETUP:
Applicable Models
General Safety Instructions
M997A2
Always wear eye protection when around
R-134a.
Avoid breathing R-134a. Be sure the work
Tools
area is properly ventilated in case of
General mechanic's tool kit:
accidental release into the nearby
automotive (Appendix G, Item 1)
atmosphere.
Flushing cylinder (Appendix G, Item 103)
Exercise extreme care when handling
Flush gun (Appendix G, Item 104)
R-134a.
Service refrigeration unit tool kit
Ensure adequate ventilation whenever
(Appendix G, Item 19)
R-134a is discharged.
Vacuum pump (Appendix G, Item 105)
Do not attempt to connect servicing
equipment while engine is running, and
Test Equipment
hoses must be clear of any moving engine
parts.
Manifold gauge set (Appendix G, Item 137)
Ensure hand valves on manifold gauge set
Reusable cylinder (Appendix G, Item 103.1)
are closed during connection.
Do not disconnect hoses before back-seating
Materials/Parts
service valves.
PAG lubricating oil (Appendix B, Item 35.2)
Eye protection must be worn when using
Refrigerant R-134a (Appendix B, Item 42.2)
compressed air.
Nitrogen (Appendix B, Item 37)
Ensure high side service valve on manifold
Flushing agent (Appendix B, Item 15)
gauge set is in OFF/CLOSED position
during charging.
Manual References
Do not vent R-134a into the atmosphere.
Recover all refrigerant in a reusable
TM 9-2320-280-10
cylinder (RR-C-910-1-4).
TM 9-2320-280-20
Never smoke where R-134a is used
TM 9-2320-280-24P
or stored.
Exposure to R-134a may be hazardous for
Equipment Condition
individuals with cardiac rhythm
Hood raised and secured (TM 9-2320-387-10).
abnormalities.
Maintenance Level
Direct support
WARNING
Avoid breathing R-134a. The gas will irritate the nose, throat,
and lungs. In addition, because R-134a is heavier than air, it
can displace oxygen in a confined and a poorly ventilated area.
Be sure the work area is properly ventilated in case of
accidental release into the nearby atmosphere.
Always wear eye protection when using R-134a or when
servicing the air conditioning system. Injury will result if
R-134a comes in contact with eyes.
Exercise extreme care when handling R-134a. Direct contact
between R-134a and skin may cause frostbite.
Ensure adequate ventilation whenever R-134a is being
discharged. Injury to personnel may result if used in a confined
area.
Do not attempt to connect servicing equipment while engine is
running. Injury to personnel or damage to equipment may
result.
Personnel with a history of cardiac rhythm abnormalities
should be made aware of potential aggravation as a result of
exposure to R-134a. Failure to do so may result in injury to
personnel.
Never smoke in areas where R-134a is used or stored. Injury to
personnel may result.
Change 2
