Operation; Pattern Control - Task Force Tips MASTER FOAM Series Instructions For Safe Operation And Maintenance

6.0 OPERATION

6.1 PATTERN CONTROL

The MASTER FOAM's spray pattern is adjustable from straight stream to a 90° wide fog. On models with manual shapers turning the
stream shaper clockwise (as seen from the operating position behind the nozzle -see fi gure 6.1A.) moves the shaper to the straight
stream position. Turning the shaper counterclockwise will result in an increasingly wider pattern. Only 90° of rotation is required to go
from wide fog to a straight stream. The widest pattern is useful for protection and cooling but doesn't educt foam.
RC Masterfoam nozzles actuate diff erently than manual versions. A drive pin controls the location of the shaper along cam grooves
manipulating the stream (see Fig. 6.1B). When the drive pin is at the forward end stop the nozzle will project a straight stream.
Likewise, at the back end stop the nozzle will project a wide fog pattern.
Since the stream trim point varies with fl ow, the stream should be "trimmed" after establishing a steady fl ow. To properly trim the
stream, fi rst open to a narrow fog. Then close the stream to parallel to give maximum reach. NOTE: Turning the shaper further
forward will cause stream crossover and reduce the reach of the nozzle.
WARNING
Wide
Fog
Wide
Fog
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Nozzle reaction will vary as supply conditions change: such as opening or closing other nozzles,
hose line kinks, changes in pump settings, etc. Changes in spray pattern or fl ushing will also
aff ect nozzle reaction. The nozzle operator must always be prepared in the event of these
changes. Failure to restrain nozzle reaction can cause fi refi ghter injury from loss of footing and/
or stream protection.
Straight
Stream
Pattern Control and Flushing
Straight
Stream
Fig 6.1A
17
Remove baffle to flush
1-1/8" (28mm) socket
tighten to 30 ft-lbs
(40 Newton-meters)
Remove baffle to flush
(1000 & 1250 gpm)
1" (26mm) socket
1500 to 2000 gpm
1-1/4" (32 mm) socket
tighten to 30 ft-lbs
(40 Newton-meters)
LIZ-030 March 8, 2018 Rev12