11
AccuMax SP
Installation and Operation Manual
Check Valves
It is required by NFPA to install a check valve in the foam
concentrate injection line to prevent foam concentrate
flow from the foam tank to the injection point (at the main
waterway) due to static head pressure. The concentrate
check valve is included with each system (3/4” NPT with
the 3020 and 3040; 1” NPT with the 3060; 1-1/4'' NPT
with the 3090; 1-1/2” NPT for the 3150; 2” NPT for the
3300; and a 1/2'' NPT with the “D” sections).
If the system is to be installed in an apparatus where
potable water sources may need to be isolated from the
possibility of foam contamination, there are a few
methods that can be incorporated into the design of the
apparatus or on the outside of the apparatus.
One of the methods is to install check valves in all water
line locations, such as flush lines, where foam
concentrate could drain back into the water pumps or
tanks of the fire apparatus, and where the water piping
that will supply foam solution connects to the apparatus
water pump discharge.
Another method is to install a check valve or other device
between the water pump tank and the suction inlets to
the water pump, or outlets of the hydrant.
These are just a few of the methods that may be
available.
Drain lines must be provided from all water and foam
solution piping components to prevent freezing in cold
weather. Multiple drain systems that allow individual drain
lines to connect with one another may allow foam or
water to circumvent the check valves. Care must be
taken to avoid this possibility as contamination of the
water tank, foam tank, or water pump may result.
Electrical Requirements
Electrical wiring must be supplied from the main
apparatus electrical system to each foam pump base
unit. The standard FoamPro AccuMax SP system
requires a minimum of 5 amperes at a voltage of 12 or
24 volts DC and is to be connected to the driver box. A 5
or 10 ampere fuse should be installed in the power line
to the system. The power must be supplied directly from
the battery or the battery master disconnect switch.
Separate wires should be run for each connection.
Braided flat ground straps are required for ground
connections. The flat straps limit the RFI/EMI
interference encountered with radios, computers or
other sensitive electronic equipment.
CAUTION: Always disconnect the ground straps,
electrical wires, and control cables from the Digital
Display Control Module, the control driver box, and
any other FoamPro equipment before electric arc
welding at any point on the apparatus. Failure to do
so will result in a power surge through the unit
causing irreparable damage and is not covered
under warranty.
