Ransburg RMA Indirect A12869 - Manual (Page 37)

RMA-303 Indirect Charge - Installation
LN-9268-11.4 32
N O T E
maintain the applicator surface temperatures
above the dew point in the booth.
Example: With the incoming air temperature
at 72°F (22.2°C), an RMA-303 with 65mm bell
cup rotating unloaded at 60 krpm has a tur-
bine outlet temperature drop of approximately
28°F (-2.2°C) (@ 40 krpm unloaded, DT ~ 14°
F (-10°C)). Referring to the ASHRAE Psycho-
metric chart, the saturation temperature range
(dew point) of a spray booth maintained at 70-
75°F / 65-70% RH is 62-68°F (21.1-23.9°C /
65-70° RH is 16.7-20°C). Thus it is almost
certain that the surface temperatures of the
applicator will fall below the dew point of the
booth, and an air heater will be needed in this
case.
To prevent condensation, an air heater as-
sembly (A11065-05) should be assembled
after the air filters. (Reference the current Air
Heater Assembly service manual for further
information.)
> Failure to use an air heater may cause dam-
age to equipment or ruin the finished compo-
nent being processed.
> Connect Air heater to turbine air tubing.
Figure 4: A11065-05 Air Heater
! W A R N I N G
> Air must be properly filtered to ensure ex-
tended turbine life and to prevent contamina-
tion of the paint finish. Air which is not ade-
quately filtered will foul the turbine air bear-
ings and cause premature turbine failure.
The correct type of filters must be used in an
RMA-303 system. The filter elements must
be replaced on a regular schedule to assure
clean air.
> It is the end user’s responsibility to en-
sure clean air at all times. Turbine failure
resulting from contaminated air will not be
covered under warranty.
Figure 5 shows
the pre-filter(s) and bearing air filter which are
recommended for use in RMA-303 systems.
If other filters are incorporated in the system,
the filters to be used must have filtering ca-
pacities equal or better than those shown in
"Air Filtration Requirements" above.
> The user must ensure the bearing air
supply is not inadvertently turned off while
the RMA-303 air motor is turning. This will
cause air bearing failure.