CIRCULATING THE MATERIAL
It is important to mix and distribute the material in the
asphalt tank before spraying the material. Once the
material is properly heated, circulating the hot asphalt at
least ve minutes is a critical rst step for maintaining the
material at a constant temperature and consistency for
uniform spraying. ALWAYS circulate the heated asphalt
material before spraying.
The circulating system has an engine-driven pump to
circulate material through the spray wand (and spray
bar if equipped). The tack distributor delivers a volume
of asphalt that is regulated by variables, including the
temperature of the asphalt material, nozzle size and PSI
setting at the relief valve.
The tack distributor is equipped with 1/4-inch nozzles
(wand and spray bar) that deliver a 95-degree angle of
spray. It is important that the operator applies constant
and uniform pressure for uniform output.
NOTE: If equipped with the optional spray bar, the
material will also circulate through the spray
bar system.
If unable to circulate the tank after
heating the material for 15 minutes, turn off the
burners, but leave the blower running for one (1)
minute. DO NOT ATTEMPT TO REHEAT the material
for at least 30 minutes.
Circulating Valve
Figure 4-13. Circulating Valve (Open Position)
To circulate the asphalt material:
1. Park the distributor on level ground.
2. Using a ashlight, check inside the tank to be sure
the burner ue tubes in the bottom of the tank are
covered by at least one (1) inch (2.5 cm) of material
before lighting burner.
It cannot be emphasized enough that
the burner ue must be covered with at least one (1)
inch (2.5 cm) of material.
3. Ensure ALL valves on the unit are in the CLOSED (or
OFF) position before proceeding. (Refer to Page
3-6 and 3-7, Valve Controls.)
• Propane tank valve.
• Fuel valve (diesel burner only).
• Shut-Off valve.
• Pilot valve.
• Ignitor wand valve.
• Liquid asphalt valves.
• Flush valve.
• Circulating valve.
• Spray wand valves.
• Sampling valve.
• Spray bar valves, if equipped with this option.
Operation
L300 and L600 Tack Distributors4-16
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