SPRAY GUN
Attach spray gun to airless unit and tighten fittings securely. Set the gun safety
latch. The gun safety latch should always be set when the gun is not being
triggered. Read all warnings and safety precautions supplied with the spray gun
and in product manual.
SPRAY TIP ASSEMBLY
1
Be sure
PRESSURE RELIEF
PROCEDURE
is followed before
assembling tip and housing to
the gun.
2
Lock gun safety latch.
3
Insert Tip into the guard housing
assembly.
4
Guide metal seat into guard housing
assembly through retaining nut and turn
until it seats against the cylinder.
5
Insert O
-
Ring gasket on metal seat so it fits in the grooves.
6
Finger tighten guard housing retaining nut onto the gun.
7
Turn guard in the desired position.
8
Completely tighten the retaining nut.
TO REMOVE CLOGS FROM SPRAY TIP
1
Lock gun safety latch.
2
Turn tip handle 180 degrees.
3
Disengage trigger lock & trigger gun into pail.
4
If the tip handle appears locked loosen the retaining nut. The handle will now
turn easily.
5
Engage gun safety latch and return handle to the spray position.
18
QTech
QT290 Airless Sprayer
19
Brought to you by
Aristospray
CLEANING GUN HANDLE FILTER
Immediately after the work is finished, flush the gun out with a solvent. Brush
pins with solvent and oil them lightly so they will not collect dried paint. To clean
the filter, use a brush dipped in an appropriate solvent. Change or clean filters at
least once a day. Some types of latex may require a filter change after about
four hours of operation.
SPRAY TIP SELECTION
Spray tip selection is based on paint viscosity, paint type, and job needs.
Generally, use a smaller tip for light viscosities (thin paints), and use a larger tip
for heavier viscosities (thicker paints). Spray tip size is based on how many
litres of paint per minute can be sprayed through the tip. Do not use a tip
larger than the maximum pump flow rate or capacity the sprayer can
accommodate. Pump flow rate is measured in litres per minute (LPM).
PATTERN WIDTH
Two tips having the same tip size, but different pattern widths will deliver the
same amount of paint over a different area (wider or narrower strip). A spray tip
with a narrow pattern width makes it easy to spray in tight places. Thickness of
the paint coat per stroke is determined by spray tip "fan width", rate of the spray
gun movement, and distance to surface.
SPRAY TIP REPLACEMENT
During use, especially with latex paint, high pressure will cause the orifice to
grow larger. This destroys the pattern. Replace tips before they become
excessively worn. Worn tips waste paint, cause overspray, make cutting
-
in
difficult, and decrease sprayer performance. If the tip is the maximum rated size,
when it wears, it will exceed the flow rate capacity of the sprayer. If when using
maximum capacity tip size the pump cannot keep up, then you know that the tip
is worn beyond capacity.
