TM 9-4110-255-14
5-10. DISCHARGING THE REFRIGERANT SYSTEM . - Continued
CAUTION
Follow instructions for specific refrigerant recovery unit being used to avoid compressor oil loss.
Loss of oil could result in compressor damage.
NOTE
Venting tetrafluoroethane refrigerant into the atmosphere rather than recovering it is subject to
pending EPA restrictions. Venting the refrigerant may be a violation of public law and subject to
severe penalties.
(2)
Open service manifold pressure and compound gage valves.
(3)
Open service manifold charge valve. Operate recovery unit until all refrigerant has been removed
from system.
(4)
Close service manifold valves.
(5)
Shut-down refrigerant recovery unit.
5-11. PURGING THE REFRIGERANT SYSTEM .
This task covers:
INITIAL SETUP
Tools:
General Safety Instructions:
Nitrogen Regulator
WARNING
6, Section III, Appendix B
Materials/Parts:
Never pressurize refrigerant lines with
Nitrogen
oxygen, mixture with oil could cause an
22, Appendix E
explosion.
The pressure in a nitrogen cylinder can
Equipment Conditions:
exceed 2000 psi. A nitrogen pressure
regulator should be used at all times to
Refrigerant system discharged (para 5-10).injury.
avoid personal injury.
Nitrogen is an inert gas that can cause
suffocation and must be discharged in a
well ventilated area.
Purge. The item being serviced must be purged with dry nitrogen before and during brazing/debrazing operations
to minimize internal oxidation and scaling.
(1)
Disconnect charge hose from recovery unit and connect to nitrogen regulator on nitrogenank.
t
(2)
Disconnect the manifold hoses from the compressor flare couplings.
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