TM 9-4120-357-14
e. Reverse the pump connections, replace the filter with a new filtering medium, and back-flush the system for an
additional 15 minutes.
f. Remove the pump, reservoir, filter and drier-strainer jumper. Place an
empty container below the compressor
connections, and connect a cylinder of dry nitrogen to each drier-strainer connection in turn. Blow down each leg of the
system at 50 PSIG (3.5 KG/SM2) for at least 30 seconds.
g. Disassemble both expansion valves (V4 and V5, Figure 5-1) and re-install the valve cages. Install new gaskets,
and assemble the valves, making sure the projections on valve cages fit in notches in valve bodies.
h. Disconnect the dry nitrogen cylinder, and immediately install a
new drier-strainer, be
sure that the direction-of-
flow arrow points down. Cap or plug compressor connection if compressor is not to be installed immediately.
Figure 5-1. Typical Flushing Hook-up.
5-11