TM 9-4120-402-14
5-14. FLUSHING THE REFRIGERANT SYSTEM.
This task covers: a. Flush
b. Purge
INITIAL SETUP
Tools
Materials/Parts
Refrigeration Unit Service Tool Kit
Refrigerant R-114
Appendix B, item 1
Appendix E, item 5
Goggles
Appendix B, item 2
Appendix E, item 8
Gloves
Equipment Condition
Appendix B, item 2
Remove Compressor (para 5-32).
Diaphragm Pump
Appendix B, item 8
Nitrogen Regulator
Appendix B, item 7
a.
Flush.
Flush the refrigerant system with refrigerant R-114. Procedures for flushing the system are as follows:
(a)
Connect the two filter-drier fittings with a jumper, locally manufactured from refrigerant tubing and fittings.
(b)
Connect a line from the discharge line in the unit to the discharge side of pump.
NOTE
The R-114 may be recirculated if run through a 10 micron filter.
An unused refrigerant desiccant dehydrator or other suitable
medium may be used as a filter.
(c)
Connect a line containing a filter to the suction line in the unit. The other end of the line should discharge into
a small drum or suitable reservoir.
(d)
Connect a line to draw from the bottom of the reservoir to the inlet of the pump.
5-41
