TM 9-4120-388-14
5-21. COMPRESSOR (B1) - Continued.
Death or serious injury could occur if compressed air is directed against the skin.
Do not use compressed air for cleaning or drying unless the pressure is/has been
reduced to 30 psi (2.11 kg/cm2 or less. EXCEPTION: Air pressure at 50 psi (3.52
kg/cm 2) is required to blow out refrigerant tubes after compressor burnout. When
working with compressed air use extreme caution and always use chip guards,
eye protection and personal protective equipment.
Remove the dehydrator (filter-drier), and blow down each leg of the refrigeration system. To do this, con-
(5)
nect a cylinder of dry nitrogen (Item 9, Appendix E) to each dehydrator connection, in turn, and open the
cylinder shutoff valve for at least 30 seconds at 50 psig (35 kg/mm2) pressure.
Connect the two dehydrator fittings with a jumper, locally manufactured from refrigerant tubing and fittings.
(6)
Clean system by back-flushing with liquid R-11 (item 16, Appendix E) from pressurized cylinder or circu-
(7)
lating pump and reservoir with pressure of at least 100 psig.
If pump is used, connect the discharge line of the refrigerant system to the discharge side of pump.
(8)
(9)
Connect a line containing a filter to the suction line in the unit.
NOTE
An unused dehydrator or other suitable medium may be used as a filter.
(10) The other end of the temporary suction line should be connected to a small drum or suitable reservoir.
(11 ) A line should be run from the bottom of the reservoir to the inlet of the pump.
(12) Fill reservoir with fluorocarbon refrigerant, R-11 (item 16, Appendix E) and start the pump. Continue filling
the reservoir with refrigerant, R- 11, until it begins to pour out of the return line. Continue flushing for at least
15 minutes.
(13) Reverse the pump connections, replace the filter with a new filtering medium, and backflush the system
for an additional 15 minutes.
Death or serious injury could occur if compressed air is directed against the skin.
Do not use compressed air for cleaning or drying unless the pressure is/has been
reduced to 30 psi (2.11 kg/cm2 ) or less. EXCEPTION: Air pressure at 50 psi (3.52
kg/cm 2) is required to blow out refrigerant tubes after compressor burnout. When
working with compressed air use extreme caution and always use chip guards,
eye protection and personal protective equipment.
(14) Remove the pump, reservoir, filter, and dehydrator jumper. Place an empty container below the compressor
connections, and connect a cylinder of dry nitrogen (item 9, Appendix E) to each filter-drier connection
in turn. Blow down each leg of the system at 50 psig (3.52 kg/cm2) for at least 30 seconds.
(15) Disconnect the dry nitrogen cylinder. Cap or plug open connections if compressor and filter-drier are not
to be installed immediately.
Compressor installation.
g.
The compressor is supplied with a complete charge of oil. Take care that oil is not
lost when handling and Installing compressor.
5-52