3.7
Pinto BT-POM 1212 - Revision 5
Section 3 Foam Marker
The foam marker adjustment knob & pressure gauge.
RHS Foam Marker
Controller (if fi tted)
The foam marker works by pumping air
through the FoamTube™ on its way to the
boom. Liquid is injected through an orifi ce
into the air stream just prior to entering the
foam mixing tube. A directional valve (on
two sided models) then diverts the foam
either left or right.
To operate the foam marker:
1 Make sure the fi lter is clean.
2 Make sure the foam marker tank tap
is open.
3 To start the foam marker, move the
switch either LEFT or RIGHT. The
option of left or right selects which
side you want the foam to go.
The unit operates 100% either way.
The only difference is the position the
Directo-Valve is set.
4 Turn OFF the foam marker by placing
the switch in the central position.
5 The reset switch (resettable circuit
breaker) on the controller, allows
resetting if a prolonged high current
condition occurs.
The foam marker control with switch in OFF position.
Setting Liquid Pressure
The foam marker injects the foam liquid
mixture under pressure into the air stream
to make foam. Liquid pressure is adjusted
using the in-cab control (see page 3.6).
The foam control knob adjusts the relative
mixture of air and water, which in turn
controls the output and quality of foam.
The pressure gauge shows the pressure
at which the liquid is being injected (higher
pressure means more liquid is being
injected into the air stream)
When the knob is turned fully counter-
clockwise, the liquid pump is shut
completely off. By rotating the knob
clockwise, the pump will speed up,
increasing liquid fl ow and liquid pressure
will rise.
Adjust the pressure to obtain the best
foam result for your conditions.
• Do not operate under 20 psi. It will
often result in intermittent foam
because there simply isn’t enough
liquid pressure to overcome the
foam discharge pressure.
Low foam output.The foam marker pressure gauge.
Never operate the unit continuously over 60 psi.
Operating continuously above 60 psi will overload
the system and may cause damage.
WARNING
Air pressure is factory set at a maximum of 28
psi. Do not increase above 28 psi or damage
may result.
WARNING
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