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Air Supply
Air Supply
Air Requireme
nts
• Compressed air supply pressure: 85-100 psi
(0.6–0.7 MPa, 6.0-7.0 bar).
• Air hoses: use grounded hoses that are correctly
sized for your system.
• Air regulator and bleed-type shutoff valve: include
in each air line to fluid supply equipment. Install
an additional shutoff valve upstream of all air line
accessories to isolate them for servicing.
Trapped air can cause a pump or dispense
valve to cycle unexpectedly, which could result
in serious injury from splashing or moving parts.
Usebleed-typeshutoffvalves.
To reduce the risk of fire and explosion if using
a Graco electrostatic gun, a shutoff valve must
be installed in the gun air line to shutoff the
atomizing and turbine air to the gun. Contact
your Graco distributor for information on air
shutoff valves for electrostatic applications.
• Air line filter: to filter oil and water out of the air
supply and help avoid paint contamination and
clogged solenoids. See Technical Data, page 37,
for air filtration requirements.
Air Connections
1. Tighten all system air and fluid line connections
as they may have loosened during shipment.
2. Connect the main air supply line to the main air
inlet (136). This air line supplies the solenoids,
valves, and pumps. Do not use this line to supply
the gun’s atomizing air.
3. Connect a separate, dedicated, clean air supply
line to the air inlet (159a) of the air flow switch.
This air suppl
ies gun atomizing air. The air flow
switch detec
ts air flow to the gun and signals the
controller w
hen the gun is being triggered.
NOTE: If ther
e is more than one gun (for
example, a se
parate gun for each color), the
atomizing a
ir outlet (159c) must be branched to
each gun. Fo
r ease of maintenance, install a ball
valve at all
air line tees.
Figure 11 Atomizing Air and Air Manifold Connections
Key
Connection
Description
A Air inlet
C Air cutoff output
(plugged)
M
Exhaust muffler
S Solvent cutoff output
(plugged)
20 332458B