beautypg.com

Operation, Air heater requirements – Ransburg Turbodisk Applicator Assembly A11376 User Manual

Page 16

background image

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