(4) YOU must clean the entire refrigeration system after a burnout has occurred, since contaminants will
have been carried to many corners and restrictions in the piping and fittings. These contaminants will soon mix
with new refigerant gas and compressor oil to cause repeated burnouts.
(5) Remove the filter-drier, and blow down each leg of the refrigeration system. To do this, connect a
cylinder of dry-nitrogen to each filter-drier connection, in turn, and open the cylinder shutoff valve for at least 30
seconds at 50 psig (3.5 kg/cm2) pressure.
(6) Connect the two filterdrier fittings with a jumper locally manufactured from refrigerant tubing and
(7) Connect the discharge line of the refrigerant system to the discharge side of a small diaphragm-type
(8) Connect a line containing a filter to the suction line in the unit.
An unused filter-drier or other suitable medium may be used as the filter.
(9) The other end of the temporary suction line should be connected to a small drum or suitable reservoir.
(10) A line should be run from the bottom of the reservoir to the inlet of the pump.
Be sure there is adequate ventilation during this procedure.
(11) Fill reservoir with fluorocarbon refrigerant, R-11, 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.
(12) Reverse the pump connections, replace the filter with a new filtering medium, and backflush the
system for an additional 15 minutes.
(13) Remove the pump, reservoir, filter and filter-drier jumper. Place an empty container below the
compressor connations, and connect a cylinder of dry nitrogen to each filter-drier connection in turn. Blow
down each leg of the system at 50 psig (3.5 kg/cm2) for at least 30 seconds,
(14) Disconnect the dry nitrogen cylinder and immediately install a new filter-drier, making sure that the
direction- of-flow arrow points toward the sight glass. Cap or plug compressor connections if compressor is not
to be installed immediately.
g. Installation. (See figure 5-18.)
The compressor is supplied with a complete charge of oil. Take care that oil is not lost when
handling and installing compressor.
(1) Install the four sets of hardware that fit under the compressor in the order shown on figure 5-18, Tape
or otherwise restrain the cap screw heads so that they do not fall out until compressor has been installed.