Index revision : A
11
7116
1.5. Important Recommendations
1.5.1. Compressed air quality
The air must be filtered to a level that will guarantee a long life time and prevent any pollution during
covering.
The filter must be installed as close to the installation as possible. The filter cartridges must be changed
regularly to ensure that the air is clean.
Teflon tape or glue should not be used between the filter and the bearing as glue residue or pieces of
Teflon may block the small holes of the air bearing and cause turbine failure.
The inside of hoses supplying air to the atomizer and the ports of the quick-disconnect plate must be
clean and free of any traces of coating product, solvent or other foreign matter.
The guarantee does not cover faults caused by unclean, unfiltered bearing air resulting from non-
compliance with the previous recommendations.
WARNING : If the air is not correctly filtered, the bearing may become fouled resulting in a tur-
bine operating fault. The filtering system used must prevent particles greater than
0,1
μ
m in diameter from reaching the bearing.
WARNING : The guarantee does not cover damage caused by foreign matter (coating product,
solvent or other foreign matter) entering the air circuits of atomizer PPH 707 CHEM
ICWB M TI.
1.5.2. Product quality
The coating product must be filtered to prevent any damage to the atomizer.
The maximum permissible particle size in the atomizer is 200
μ
m.
1.5.3. Bearing safety
The compressed air connection to the air bearing must be made directly via the supply circuit (without
using an isolating valve). A sudden cutoff of the air supply may cause partial damage to the turbine air
bearing, possibly resulting in system shutdown.
In addition, a 25-liter air reserve should be available so that the turbine brakes gradually if the main air
supply is cut off suddenly.
WARNING : The guarantee does not cover faults that occur if the turbine is operated with
insufficient bearing air pressure.
1.5.4. Locking
Do not atomise the product if the bell cup is not rotating at a speed of at least 15,000 rpm. At lower
speeds, coating product or solvent may enter the turbine, bearing and control circuits. Opening the head
valve, the injector rinsing valve and the bell cup exterior rinsing valve must therefore be prohibited when
the bell cup is not rotating. Only qualified personnel are authorised to by-pass this locking system for
flow rate checks.
WARNING : If the turbine is not already operating, wait, after starting it up, until the bell cup
reaches at least 15,000 rpm before opening the head valve. The recommended
minimum waiting time is 2 seconds.
