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For the recommended air supply system installation,
see Instruction Manual 307–375.
The following are additional recommendations for Max-
imum Noise Reduction:
1. See Fig. 2. The air line should be connected to the
air motor inlet (S) with a grounded flexible hose.
Also, use flexible fluid outlet and suction hoses.
Where possible, avoid using solid plumbing, which
carries noise vibrations.
2. Mount the air motor on resilient rubber pads, rather
than sheet metal.
3. Determine minimum air inlet pressure and pump
cycle rate to achieve desired spray/dispensing re-
sults or minimum fluid pressure and flow. This will
result in less system wear and less overall noise.
Air Motor Icing
Moisture in the compressed air can collect in the air
motor and freeze, causing the motor to stall. This is
called icing. If icing occurs, shut off the air supply and
allow the ice to thaw.
Model 237–001 Reduced Icing Air Motor allows you to
divert a stream of air over the air valves. This flow of
warm air prevents water from collecting and freezing.
The amount of air is adjustable with a needle valve
(88, see the parts drawing on page 16).
KEY
L
Auxiliary Air Exhaust Port
M 1" npt(m) Air Exhaust Hose
N
Exhaust Manifold
P
Motor Base
R
Location of Air Exhaust Holes
S
Main Air Inlet
Must slope downward from motor to exhaust manifold.
Exhaust manifold must be lower than base of motor.
Plug exhaust holes when using auxiliary air exhaust.
Fig. 2
Installation
M
To minimize icing, reduce the moisture in your com-
pressed air supply by using an air dryer or a filter
which traps water. The air supply to the motor should
be conditioned to a pressure dew point of 2 to 7 C (35
to 45 F) at an inlet air temperature of 21 C (70 F).
The main air line should slope slightly downward so
water will collect at the end of the line, where it can be
drained. Additionally, plumb each drop line from the top
of the main air line. Install an automatic drain or a drain
valve at the bottom of each drop.
For additional help in designing your system, contact
Graco Technical Assistance (see back page).
Auxiliary Air Exhaust (Model 215–255)
An auxiliary air exhaust line may be connected to Mod-
el 215–255, for use in a header system. Remove the
pipe plug (15, see the parts drawing) from the 1" npt(f)
auxiliary air exhaust port (L) at the top of the motor.
Connect a 1" npt(m) exhaust hose (M) to this port. The
exhaust hose must slope downward, and the exhaust
manifold (N) connection must be lower than the base
of the motor (P), to prevent moisture from accumulat-
ing in the line and draining back into the motor. See
Fig. 2.
Plug the 17 air exhaust holes (R) in the air motor cylin-
der with size 3.5 x 1.3, 13 mm long self-tapping
screws.
S
P
N
L
M
R
Model 215–255 Shown
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