Installation, Operation, Preventive Maintenance & Cleaning - DeVilbiss HD Series Technical Bulletin

INSTALLATION
For maximum transfer efficiency, do not use more
pressure than is necessary to atomise the material
being applied. NOTE: when using the H1, HVLP
setup do not exceed 2 bar inlet pressure.
1. Connect the gun to a clean, moisture and oil free
air supply using a conductive hose, of at least 8
mm I.D.
Depending on hose length, larger I.D. hose may
be required. Install an air gauge at the gun
handle. When gun is triggered on, adjust
regulated pressure to 2.0 bar. Do not use more
pressure than is necessary to atomise the
material being applied. Excess pressure will
create additional overspray and reduce transfer
efficiency.
If quick connect couplings are required, use only
high flow quick connects approved for HVLP
use. Other types will not flow enough air for
correct gun operation.
If an air adjusting valve is used at the gun inlet,
use DGIPRO-502-BAR Digital Gauge. Some
competitive adjusting valves have significant
pressure drop that can adversely affect spray
performance. The DGIPRO Digital Gauge has
minimal pressure drop, which is important for
HVLP spraying.
2. Attach the gravity feed cup to the material inlet.
Before using the gun, flush it with solvent to
ensure that the fluid passages are clean.
OPERATION
1. Mix coating material to manufacturer's
instructions and strain material.
2. Fill the cup to no more than 20 mm from the top
of the cup. DO NOT OVERFILL.
3. Attach Cup Lid.
4. Turn fluid adjusting knob (18) clockwise to
prevent fluid needle movement.
5. Turn spreader valve adjusting knob (23) counter
clockwise to fully open.
6. Adjust inlet air pressure to 2.0 bar.
7. Turn fluid adjusting knob counter clockwise until
first thread shows.
8. Test spray. If the finish is too dry, reduce airflow
by reducing air inlet pressure.
9. If finish is too wet, reduce fluid flow by turning
fluid adjusting knob (18) clockwise. If atomisation
is too coarse, increase inlet air pressure. If too
fine, reduce inlet pressure.
10. The pattern size can be reduced by turning
spreader valve knob (23) clockwise.
11. Hold gun perpendicular to surface being
sprayed. Arcing or tilting may result in uneven
coating.
NOTE
NOTE
NOTE
NOTE
12. The recommended spray distance is 150-200
mm.
13. Spray edges first. Overlap each stroke a
minimum of 75%. Move gun at a constant speed.
14. Always turn off air supply and relieve pressure
when gun is not in use.
PREVENTIVE MAINTENANCE &
CLEANING
To clean air cap and fluid nozzle, brush exterior with
a stiff bristle brush. If necessary to clean cap holes,
use a broom straw or toothpick if possible. If a wire or
hard instrument is used, extreme care must be used
to prevent scratching or burring of the holes which
will cause a distorted spray pattern.
To clean fluid passages, remove excess material
from cup, then flush with gun wash solution. Wipe the
gun exterior with a dampened cloth. Never
completely immerse in any solvent or cleaning
solutions as this is detrimental to the lubricants and
life of the spray gun.
When replacing the fluid nozzle or fluid needle,
replace both at the same time. Using worn parts can
cause fluid leakage. See page 13, Chart 2. Also,
replace the needle packing at this time. Torque the
fluid nozzle to 18–20 nm. Do not over tighten.
To prevent damage to fluid nozzle (8) or fluid
needle (15), be sure to either 1) pull the trigger
and hold while tightening or loosening the fluid
nozzle, or 2) remove fluid adjusting knob (18) to
relieve spring pressure against needle collar.
IMPORTANT– the Gravity cup is made from
special anti-static materials, but it still important
to avoid generating static charges. The Cup must
not be cleaned or rubbed with a dry cloth or
paper. It is possible to generate a static charge
by rubbing which, if discharged to an earthed
object could create an incendive spark and cause
solvent vapours to ignite. Only use a dampened
cloth or antistatic wipes if manual cleaning is
required within a hazardous area.
8
NOTE
CAUTION
CAUTION
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