Pierce HUSKY 12 GPM, Operation & Maintenance Manual

Page: 12 / 76

GENERAL
2-2 / Husky 12 Foam System
© 2017 Pierce Manufacturing Inc. All Rights Reserved.
2-1.6 Flush System
A flush mode allows the system to flush all foam concentrate with clear water. The flush circuit control logic ensures
the foam tank supply valve is closed prior to opening the flush valve. The flush valve is electrically controlled and
is operated from the foam system control head. A manual flush drain valve is located under the driver’s side running
board.
2-1.7 Foam Concentrate Compatibility
The Husky 12 Foam Proportioning System is designed to be compatible with most known Class A and Class B foam
concentrates at the date of printing of this manual.
The Husky 12 can proportion foam concentrates across a wide range of viscosity, from low viscosities such as Class
A or AFFF, through high viscosity AR-AFFF.
Table 2-2: Acceptable Foam Concentrate Viscosity Range
2-2. Description of Major Components
To understand the relationship of the various components and their functions, refer to
“System Diagrams”
on
page 4-37
. The following information is intended to identify the various components and describe their function
within the system. For specific construction, maintenance, and parts information, please refer to applicable service
groups (chapters) in the service manual, drawings included in this manual, and the parts catalog for this unit.
2-2.1 Hydraulic Drive System
The hydraulic drive system that powers the foam pump is automatically activated when the water pump is engaged.
A hydraulic oil cooler prevents overheating of the hydraulic oil, which can be detrimental to system components. The
oil/water cooler is designed to allow continuous system operation without allowing hydraulic oil temperature to
exceed the oil specifications.
The system is delivered with ISO 68 hydraulic oil.
Emulsifier type agents may cause damage to seals in Husky foam systems.
In the event you are using an emulsifier type encapsulator agent, do not store foam system wet.
Perform a flush after every use and keep system dry when not in use.
Failure to comply may cause damage to equipment.
Acceptable Foam Concentrate Viscosity Range
Minimum 3 Centistokes
Maximum 6000 Centipoise
*
* Brookfield #3 Spindle @ 30 RPM