26
Installation and Operation Manual
A side-mount foam tank low-level sensor is available to
be used if both the top and bottom of the is not
accessible. The side-mount foam tank low-level sensor
has 1/2" NPT threads. The float must be positioned on
top of the switch to move up and down (arrow on side of
switch). The distance from the bottom of the foam tank
to the center of the switch should allow sufficient foam
concentrate volume for two minutes of pump run time
(See Figure 9-6).
The side-mount foam tank low-level sensor must be
sealed with a suitable sealant to prevent concentrate
leakage. After installation, check operation of the side
mount foam tank low-level sensor with a powered test
light. With no foam in the tank, the light should be on. If
the light does not come on, rotate the side mount low
level sensor until the test light is on. The float should be
allowed to swing up and down freely.
NOTE: When the foam tank low-level sensor senses
a low concentrate condition, the system will operate
for two minutes before shutting down, unless the
concentrate level is restored.
When locating the foam tank low-level sensor in the
foam tank, sufficient foam volume must be present
for two minutes of operation. This determination will
be made using the most frequent foam concentrate
injection rate and water flow.
Power Supply
Electrical devices can be damaged by a weak or erratic
power supply. The FoamPro AccuMax SP is not different
- the better the power supply, the better the FoamPro will
perform.
•
Always
connect the primary 12 or 24-volt positive
(+) lead from the valve driver to the master switch
terminal or the positive battery terminal using 12
AWG chemical resistant wire protected with a wire
loom. Install a 5 amp fuse to the + power line to the
valve driver.
•
Always
connect the ground lead (-) from the valve
driver to the chassis or to a good solid ground
location.
•
Never
connect the main power leads to other leads
that are supplying other devices such as: a light bar,
a siren, or primer pumps. The FoamPro AccuMax
SP hydraulic motor-driven foam pump requires a 5
amp minimum current.
•
Always
make the connection to the primary power
supply the last step.
RFI/EMI
The following steps on grounding will help limit radio
interference cause by the unit. In addition to adequate
grounding, make sure radio cables and hardware are
not located in the immediate area where the FoamPro
equipment is mounted.
RFI/EMI beads supplied with the FoamPro AccuMax SP
components must be mounted on the control cables
and flowmeter cables. An RFI/EMI suppression kit is
supplied with the FoamPro AccuMax SP. Install the
clamp-on beads at the locations indicated in Figure 9-7.
Silicone caulk, electrical tape, plastic wire ties, or heat
shrink tubing may be used to ensure the beads do not
move after installation. Two clamp-on beads are
required at each connector, and they must be slid as
close as possible to the connector.
Making round coils of extra control and flowmeter
cables in the pump compartment can act as an
antenna. While the flowmeter and control cables cannot
be shortened, various lengths of premolded cable are
available to minimize the "extra" cable in the truck.
Refer to the parts list in Section 15 for part numbers of
different size control and flowmeter cables.
When routing control and flowmeter cables, take care to
avoid routing them next to antenna cables, radio power
lines, and radio components. When there is extra cable,
double the cable back on itself and secure it with plastic
wire ties in a flat bundle instead of making a round coil
(See Figure 9-8).
