Pierce HUSKY 3 - Page 52

MAINTENANCE
4-14 / Husky 3 Foam System
© 2022 Pierce Manufacturing Inc. All Rights Reserved.
Question Reason for Question Test Procedure
K. Is the flow meter operating
correctly?
The flow meter provides
the foam system with
information on how much
water is being flowed. No
signal from the flow meter
will result in the foam
system not operating.
Check for power and ground at flow meter.
Check for pulse counts on signal wire while
quickly spinning paddle wheel by hand.
Question Reason for Question Test Procedure
L. Are the system set-up, LVDT
calibration, and defaults set
correctly?
The foam system will not
operate if the system has
not been set-up and
calibrated correctly.
See “Set-up & Calibration” on page 4-2:
• Check the set-up;
• Calibrate the LVDT;
• Check all default settings.
Question Reason for Question Test Procedure
M. Does the foam pump engage
with the Discharge Foam
Pump Drain open?
To check the foam
injection check valve. If
the foam pump engages
with the valve open, it is
likely there is
contamination in the
injection check valve.
Open the Discharge Foam Pump Drain valve.
Attempt to operate the system.
Replace flow meter.
No
Yes
Correct set-up, LVDT
calibration & default settings.
No
End
Clean/replace the injection
check valve.
Yes
No