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CAFS (Continued)
Problem
Air flow meter stuck at
high CFM
Poor foam (wet or dry) or
no foam (assuming air
pressure to discharges is
OK)
Discharge hose shaking
(slug flow)
Foam in the water system
(when
proportioner turned off)
Water in compressor
oil/air
Clutch smoking
Safety pop off valve
opening at
low pressure
Safety pop off valve
repeatedly opening
F-1031, Section 2449
Troubleshooting Guide
Probable Cause
Using wetting agent and not
foam concentrate
Foam proportioning control
turned too low
Foam proportioning control
OFF or turned too low, foam
tank empty.
Foam proportioner ON,
setting correct, and tank has
foam concentrate, but not
providing foam solution
Foam concentrate was
poured into the on-board
water tank
Foam manifold drain lines
not isolated from water drain
lines
Cooler line plumbed from
manifold
Foam manifold check valve
defective
Leaking inside cooler Freeze
damage
Defective air check valve
Missing air check valves for
discharges
Engaging in RUN
position
Slight air leak from solenoid
to clutch
High RPM engagement
Not allowing compressor to
bleed down before
engaging clutch again
Contaminated clutch disc
Auto-Sync system out of bal-
ance
Sump fire damaged pop off
valve
Trim valve or inlet
completely open
Recommended Action
Move large amounts of air out discharge and turn air flow on and
off to re-couple.
Use foam concentrate
Increase amount of concentrate delivered to manufacturer
recommended amount
Make sure proportioner is turned on, foam supply valve is open,
foam tank has concentrate, Wye-Strainer is clean, and supply line
is connected to injector.
Refer to foam proportioner manufacturer's instructions for
detailed calibration and troubleshooting instructions
Flush tank and pump with clean water, refill
Isolate to separate drain valve
Relocate line to discharge side of pump
Rebuild/replace check valves
Isolate cooler and check for leaks, replace if needed, check drain
Replace or check
Install check valves
Engage in AUTO/UNLOAD only
Repair air leak
Engage in lower RPM
Allow for bleed down
Clean or replace
Adjust the Auto-Sync system, making sure to not open the trim
valve on the compressor more than 3 turns
Check system for other damage and replace valve
Refer to trim valve instructions
Page 12 of 18
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