Ransburg Turbodisk Applicator Assembly A11376 - Manual (Page 16)

Turbodisk Applicator - Operation
11
OPERATION
AIR HEATER REQUIREMENTS
Turbine drive air expands as it moves through the
turbine wheel cavity and as it exits the turbine from
the exhaust port. This expansion will cause cooling
of the exhaust air and the surfaces it contacts. This
cooling effect can cause surface temperatures to fall
below the dew point of the booth, which will result
in condensation on the interior and exterior of the
atomizer, machine, and its components. It is even
possible that the temperature of the supply air may be
below the booth dew point, even without additional
expansion cooling.
Condensation is especially probable in waterborne
applications when booth temperature and relative
humidity levels are typically maintained very high.
This condensation will allow sufficient conductiv-
ity of the surfaces such that they act as an erratic
ground source potential. This can cause damage to
the equipment.
It is therefore, a requirement that turbine exhaust air
temperature be maintained about the booth dew
point to prevent condensation from forming on
atomizer surfaces. Doing so will eliminate moisture
as a potential defect in painted surfaces as well as
extending equipment life. Thus, it is recommended
that air heaters be installed into the atomizer air supply
lines, i.e. turbine drive air. The air heaters must be of
sufficient capacity, capable of raising the incoming
air temperature at least 40 °F (4.4°C) at a flow rate of
60 SCFM per applicator.
The actual air heater process setting depends on the
applicator fluid flow rate load, booth conditions, tur-
bine airflow settings, and incoming air temperature.
> Fluids and lubricants used in this system
must contain NO silicones!
> Do NOT operate the unit without an
atomizer disk! Without a disk, overspeed,
resulting in premature bearing failure, is
possible.
> The air supplied to the motor must be
dry, clean, and free of oil or moisture. The
atmospheric dew point should be 10 o F or
less. The air heater used should be adjusted
only high enough to prevent condensation
from forming on the motor housing or at the
exhaust port.
C A U T I O N
!
As with any spray finishing system, operation of
the Turbodisk involves properly setting the oper-
ating parameters to obtain the best finish qual-
ity for the coating material being sprayed, while
maintaining correct operation and reliability of
the equipment used. Adjustments to operating
parameters, which cover spraying, cleaning, and
on/off control, include:
• Fluid Type
• Fluid Flow Rate
• Turbine Speed
• Electrostatic Voltage
• Target Distance
> Operators must be fully trained in safe
operation of electrostatic equipment. Op-
erators must read all instructions and safety
precautions prior to using this equipment
(see NFPA-33).
W A R N I N G
!
> DO NOT exceed the maximum flow rate
of 1500 cc/min. during painting or purge
cycles. Excessive fluid flow may cause an
imbalance condition and possibly premature
bearing failure.
W A R N I N G
!
AA-07-02.1