Ransburg Aerobell 168 Atex Approved 13350 - Manual (Page 34)

Bearing Air
Use tubing (clear, see-through, nylon, natural) to
connect a properly filtered air source to the bearing
air fitting on the manifold. It is recommended to
use tubing (clear, see- through) for bearing air
so that any contamination that gets past the final
bearing air filter will be apparent. Also refer to the
previous “Caution”.
Under the “Operation” section which follows, there
is a “Caution” regarding bearing damage if the
turbine is run while bearing air is off. Since the
turbine must not be operated without first turning
on bearing air, it is required to provide some
means of assuring the presence of bearing air
before turning the turbine “On.” One method is
by interlocking the turbine drive air to the bearing
air (i.e., with an air piloted valve).
Brake Air
Turbine Air
Turbine drive air must be interlocked with paint flow.
Damage to spindle will occur if paint is triggered
without the bell cup spinning. It is recommended
that the bell cup is spinning at least 10,000 rpm
before any fluid is turned on.
FLUID CONNECTIONS
See pages 23 & 24 for connections. See the
following “Note”.
† If the coating material used is heated,
check the maximum rated temperature
for the fluid tubing used. Polyethylene
tubing (H-2338 and H-2339) is rated for
a maximum of 80°F (27°C). Nylon tubing
(H-2340 and H-2341) is rated for 200°F
(95°C) maximum.
W A R N I N G !
† Arcing/fire hazard exist if ungrounded
metal connections (air or fluid) are used in
the spray area. Use plastic non-conductive
connections, or ensure metal connections
are at ground potential.
† Provisions should also be made to as-
sure bearing air remains on during the coast
down period when turbine air is turned off.
See “Specifications” in the “Introduction”
section of this manual
† Brake air is used to slow the turbine
when changing speed. It is recommend-
ed that the brake air turbine drive air be
interlocked.
NOTE
NOTE
C A U T I O N !
† Do not use PTFE tape or pipe dope on
any air beyond the final air filter for BEARING
AIR. The tape or dope may break free and
cause plugging of the turbine air bearings,
and result in turbine failure. See pages 23 &
24 for tubing connections and sizes.)
C A U T I O N !
† Any user supplied air hoses must be rat-
ed at a minimum working pressure of 100
psig (7 bar)
C A U T I O N !
† Any user supplied fluid hoses must be
rated at a minimum working pressure of 150
psig (10 bar)
C A U T I O N !
Aerobell 168 - Installation
Ransburg
LN-9247-13 31