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9. Check uid pressure gauges (GA, GB) to
ensure proper pressure balance. If imbalanced,
reduce pressure of higher component by
slightlyslightly
slightly
turning PRESSURE RELIEF/SPRAY
valve for that component toward PRESSURE
RELIEF/CIRCULATION
until gauges show
balanced pressures.
SA
SB
GA
GB
10. Open gun uid inlet valves A and B.
FusionFusion
Fusion
ProblerProbler
Probler
NOTICENOTICE
NOTICE
To prevent material crossover on impingement
guns, nevernever
never
open uid manifold valves or
trigger gun if pressures are imbalanced.
11. Disengage gun piston safety lock.
FusionFusion
Fusion
ProblerProbler
Probler
12. Pull gun trigger to test spray onto cardboard. If
necessary, adjust pressure and temperature to
get desired results.
SpraySpray
Spray
AdjustmentsAdjustments
Adjustments
Flow rate, atomization, and amount of overspray are
affected by four variables.
• FluidFluid
Fluid
pressurepressure
pressure
setting.setting.
setting.
Too little pressure results
in an uneven pattern, coarse droplet size, low
ow, and poor mixing. Too much pressure results
in excessive overspray, high ow rates, difcult
control, and excessive wear.
• FluidFluid
Fluid
temperature.temperature.
temperature.
Similar effects to uid pressure
setting. The A and B temperatures can be offset to
help balance the uid pressure.
• MixMix
Mix
chamberchamber
chamber
size.size.
size.
Choice of mix chamber is based
on desired ow rate and uid viscosity.
• Clean-offClean-off
Clean-off
airair
air
adjustment.adjustment.
adjustment.
Too little clean-off air
results in droplets building up on the front of the
nozzle, and no pattern containment to control
overspray. Too much clean-off air results in
air-assisted atomization and excessive overspray.
50334945B