Graco 226-991, Instructions-Parts List Manual

Page: 15 / 24

7 . Test the spray pattern. Aim the gun at a piece of
scrap cardboard and trigger for 1 second to check
the spray pattern. A good pattern should be round
and well atomized, and it should harden with a fairly
smooth surface. Refer to the chart in Fig 22 for the
proper size of pattern and spray distance for the
nozzle being used.
N O T E :
Release the gun trigger at least once a
minute, while spraying, if you use a
release triggering method. This is to actuate
the mechanical purger and avoid material
on the nozzle
tip
and air cap.
NOZZLE PERFORMANCE CHART
I
Needle
Nozzle Diameter
Kit No. in. (mm)
DELIVERY
Outlet
Pressure
psi (bar)
0.073
(1.85)
0.083
(2.11)
NOTE:
i
Fig 23
Flow rate test conditions: 2.7 lb (1.22 Kg) foam;
of 200
cps
at RES viscosity of .
650 at heater and hose
temperature of pump outlet pressure
as in-
dicated in chart.
At the recommended 30 in. mm) spraying distance.
Fig 22
8 . Adjust the gun’s air.
WARNING
To reduce the risk of an injection injury:
Before adjusting the air, engage the trig-
ger safety close the needle valves
disengage the trigger safety and trigger the gun to
relieve the fluid pressure. Engage the trigger safe-
ty again. See Fig 23.
a . Screw in the hole setscrew using
the Allen wrench until no air or almost no
air is escaping. See Fig 23.
b . Regulate the air to the gun to psi (7 bar).
Back off the setscrew two turns as a test set-
ting.
d . If the air appears to affect the spray pattern,
screw in the setscrew another turn. If build up
behind the air cap occurs, back off the
setscrew about turn at a time.
Shutdown
At the end of each work day, stop the pump with the
displacement rod in the
down position. Shut off the
heater and main circuit breakers and relieve the fluid
pressure as instructed in the Warning. below. Then
disconnect the gun from the fluid manifold, flush the
gun as instructed in
and store it.
WARNING
Pressure Relief Procedure
Always relieve the fluid pressure in the sprayer
and hoses before checking or adjusting any part of
the system or any component, to reduce the risk
of serious bodily injury, including fluid injection,
splashing in the eyes or on the skin, or injury from
moving parts or electric shock.
1. Engage the spray gun trigger safety latch.
2. Shut off the air to the feed pumps.
3. Turn off the air to the proportioning pump.
4. Close the gun manifold needle valves.
5. Disengage the trigger safety latch, trigger the
gun, to relieve pressure, and engage the trig-
ger safety again.
6. Open both fluid filter drain valves, having a
container ready to catch the ‘draining fluid.
7. If you are working on any part of the heater,
shut off the main electrical power to the
heater.
-Maintenance
- - - - - -
Keep the displacement pump wet-cup full of IPO at
all times to help protect the pump packings.
Refer to the separate instruction manual for each
system component for routine maintenance and repair
procedures.