Pierce HUSKY 12 GPM, Operation & Maintenance Manual

Page: 27 / 76

© 2017 Pierce Manufacturing Inc. All Rights Reserved.
Husky 12 Foam System / 3-5
OPERATION
3-2. Flushing System
3-2.1 General Flushing Information
NOTE: For the purposes of this manual, it is assumed that Class A foam is the most commonly used agent
and that the system will be stored wet with Class A foam concentrate. If Class A foam is not the
primary agent, adjust procedures to accommodate the primary foam concentrate.
Typically, no flushing is needed. The Husky 12 foam pump is designed to be flooded with foam. Unless the optional
Class B foam tank was used, a different brand of Class A foam was drafted, or Class B foam was drafted, the only
system flush that is needed is to turn the system OFF and continue flowing water until the presence of bubbles is
minimal.
When beginning mop-up operations at the scene, turn the system OFF and use the foam in the hose for mop-up.
When equipped with two on-board foam tanks (Class A & Class B), an automatic flush will occur for 10-15 seconds
when switching between the two tanks.
A foam discharge or manifold drain must be open during the automatic
flush to give the flush solution somewhere to go.
This automatic flush time can be adjusted in the set-up mode, refer to
“Set Automatic Flush Time”
on
page 4-7
for
instructions. In addition to the automatic flush, it is recommended to do an additional manual flush to ensure the
system is completely free of contaminates.