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10 308455
Operation
IV. Set the fluid and air pressure.
1. With the system primed and the gun air regulator
closed (36), trigger the gun and adjust the pressure
pot air regulator (33). Refer to Fig. 5. If available, use
the pressure setting provided by your fluid supplier.
Otherwise, use the following instructions to deter-
mine the fluid pressure.
To determine the fluid pressure setting, hold the
gun parallel to the floor. (Be sure to catch the fluid
in a container.) With the gun air pressure turned
off, trigger the gun. Adjust the pressure pot regula-
tor (33) until the straight fluid stream is within the
range indicated for the viscosity of your fluid before
it drops off. That is your optimal pressure pot air
pressure. See Fig. 6 and 7.
NOTE: If you have the HVLP spray gun, do not
exceed 15 psi (103 kPa, 1 bar) to maintain HVLP
compliance.
Fluid Viscosity Fluid Droop
Measured with #2 Zahn cup
Light (18–25 seconds) 8–10” (200–250 mm)
Medium (25–40 seconds) 6–8” (150–200 mm)
Heavy (40–60 seconds) 4–6” (100–150 mm)
Fig. 6
1
1
Fluid droop: straight
stream before fluid
drops off
1
Air Spray Gun
ti12121A
Fluid Viscosity Fluid Droop
Measured with #2 Zahn cup
Light (18–25 seconds) 4–6” (100–150 mm)
Medium (25–40 seconds) 2–4” (50–100 mm)
Heavy (40–60 seconds) 1–2” (25–50 mm)
Fig. 7
1
1
Fluid droop; straight
stream before fluid
drops off
1
HVLP Spray Gun
ti12121A
2. Release the gun trigger. Install the air cap.
3. Open the gun air shutoff valve (17a). Partially
trigger the gun so only air is emitted. Set the gun
air regulator (36) pressure as follows:
HVLP Gun – 60 psi (414 kPa, 4.1 bar)
Air Spray Gun – 65 to 90 psi (448 kPa, 4.5 bar).
4. Open the fan pattern adjusting valve (E) by turning
it fully counterclockwise, then turn it in 1 to 2 turns.
See Fig. 8.
Fig. 8
E
TI2120A
CW
CCW
5. Spray a stationary test pattern on scrap paper.
Hold the gun 10 to 12 in. (250–300 mm) from the
paper and spray for 2 or 3 seconds. If the spray
pattern is poorly atomized, the air and/or fluid
pressures may need adjustment.
If the spray pattern atomization is not fine enough,
increase the gun air pressure. If the spray pattern
atomization is too fine, decrease the gun air pres-
sure. If the atomization is still not good enough, try
lowering the fluid pressure in increments of 2 or 3
psi (14 or 21 kPa, 0.1 or 0.2 bar) to achieve the
desired finish quality.
NOTE: For the most efficient paint usage, use the
lowest air pressure needed to obtain a good finish.
Higher air pressures create more overspray and
uses more fluid.
V. You are now ready for production
spraying.
CAUTION
When using catalyzed materials, observe the fluid
pot life as recommended by the fluid manufacturer.
Always flush the system before the pot life has
expired to prevent dried fluid which may be difficult to
clean out and may damage the system.
VI. When to shut down the system.
Shut down the system at the end of the work shift and
before checking, adjusting, cleaning or repairing the
system. Always follow the Pressure Relief Proce-
dure, on page 9.