The 132 L (35 gallon) foam marker system consists of a tank, power unit, a switch in the hydro lever, the SPRAYSTAR
display, two foam mixing heads, and two air shut-off valves, two collectors or streamers and interconnecting wire harnesses and hoses.
A filler cap is located at the top of the tank (A) for adding foam concentrate and water. Inlet and outlet ports are provided at the top and bottom of the tank respectively. Pressurized air from compressor (B) flows through hose (C) to tank inlet fitting that pressurizes tank. Hose (D) is connected to tank outlet fitting to carry pressurized foam solution from tank to solenoid operated valves located in power unit.
Vent valve (S) relieves pressure in tank when filling tank with water through fill port (T). Valve should be open when filling tank and closed when finished.
The power unit box contains a 12-volt motor driven rotary vane compressor with air inlet filter and carbon outlet filter, right-hand and left-hand air shutoff valves, a high/low foam rate valve, an anti-siphon valve, an externally adjustable fluid flow control valve and interconnecting wiring and tubing.
The foam marker has two modes of operation, "Manual" and "Automatic", and two rates, "Low" and "High". Mode and rate are selected using the SETUP pages in SPRAYSTAR
(I). The operator has five choices, OFF, MAN LO, MAN HI, AUTO LO, and AUTO HI. When in manual mode, the operator controls which side the marker is operating. When in automatic mode, the foam marker automatically switches from one side to the other when the solution spray master
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switch is turned off and then on again, or if switch on top of hydro lever is pressed.
Switch (J) on hydro lever is a three-function switch used to select right-hand or left-hand foam markers. Foam marker system is off when center switch is pushed.
High/Low foam rate, selected on SETUP page of SPRAYSTAR
display, is used to choose between either a high flow rate or a lower adjustable flow rate. When the low rate is selected, the foam output is adjustable from fluid-flow control knob (L) on the foamer power unit. Turning the rate control knob clockwise decreases the amount of foam in low position. Turning it counter-clockwise increases foam rate. While in low, the foam rate can be adjusted from zero foam output to maximum output. While in high, foam liquid bypasses the fluid control valve and supplies maximum fluid flow.
The compressor provides pressurized air directly to the foam solution tank through hose (C) and to the foam mixing heads (F) through hoses (G) and (H).
Pressurized air from hoses (E) and (R) pushes against a diaphragm inside the shut-off valve (U), closing off the flow of fluid and air to the foam mixing head (F). Pushing down on right-hand side of switch (J) on hydro lever cuts off air to the right-hand hose (E), thereby allowing air and fluid to mix and create foam for right-hand side. Pushing down on left-hand side of switch (J) on hydro lever cuts off air to left-hand hose (R).
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