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Safety
Introduction
Product Overview
Installation
Operation
Troubleshooting
Maintenance
Symptom
Symptom
Possible Cause
Possible Cause
Solution
Solution
The air pressure is appropriate but
the system produces poor quality
foam.
The foam system has not been calibrated
or is out of calibration.
Make sure that the foam system has been calibrated—recalibrate the system.
You are using a wetting agent, not foam
concentrate.
Use foam concentrate rated for CAFS.
The foam proportioning control is too
low.
Increase the amount of concentrate to the manufacturer’s recommended percentage.
The air supply is restricted.
Make sure that the lines are not kinked or obstructed—remove any obstructions.
The air/water volume was not adjusted
properly.
Adjust the air/water volume to achieve the proper mixture for foam.
The air/water pressure is not balanced.
Adjust the trim valve.
The foam proportioning control is too low
or disabled, or the foam tank is empty.
Make sure that the proportioner is turned on, the foam supply valve is open, the foam tank has concentrate, the wye
strainer is clear, and the supply line is connected to the injector.
The foam pump is disabled and
there is foam in the water system.
Foam concentrate was poured into the
on-board water tank.
Flush the tank and pump with clean water, then refill.
The foam manifold drain line is not
isolated from the water drain lines.
Isolate to a separate drain valve.
The cooler line is plumbed from the
foam manifold.
Relocate the cooler line to the discharge side of the fire pump.
The foam concentrate inject check valve
is defective.
Repair or replace the check valve.
There is a leak between the water and
foam tanks.
Repair or replace the tanks.
The dry vacuum test forces foam
concentrate into the foam manifold.
Set the proportioner to flush during the test.
Water is in the compressor oil/air. The air check valves are malfunctioning. Repair or replace the check valves.
Check valves were not installed on the
discharges.
Install check valves on the discharges.
Condensation has built up in the oil/air
mixture.
Flow air once per week at a minimum, more often if operating in high humidity.
The system was exposed to cold
temperatures without the oil cooler being
drained.
Test the oil cooler for internal leaks from the water side to the oil side—replace the cooler.
The air flow meter is not reading
correctly.
The magnetic coupler has decoupled.
Turn the air flow off and then on to reset the air flow meter.
The meter is malfunctioning.
Replace the air flow meter.
