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6. Operating Conditions

7. Operating & Commissioning

AstroFan FFU is designed to for moving clean air with low concen-
trations of dust or aerosols, as well as slightly aggressive gases and

vapours up to a density of 1.3 kg/m³.

Operating temperature to be between -30

C and +40

C. Relative

humidity to be below 95% to avoid condensation.

Avoid intrusion of water.

Do not operate in explosion hazard areas.

Switching frequencies:

The fan is designed for S1 constant operation.

Avoid operations at the outer range limits of the control equipment.

Observe the special instructions for the EC motors and controls

If the leakage current exceeds 3.5 mA, the equipment has to be
earthed in accordance with DIN VDE 0180/5.88, Par. 6.5.2.1.

Before initial operation the following checks need to be carried out:

• Installation and electrical connections are completed and have
been carried out in accordance with instructions.

•

All safety equipment is properly installed and secured. (protection

grills etc.)

• Any debris and materials left-behind and other loose materials
have been removed from the FFU housing.

•

Thermistors and/or motor cut out switches have been correctly

connected and are functional.

• Cable entry points are sealed.

•

Nominal power consumption (as per nameplate) is not exceeded.

• Connection data comply with the data from nameplate. See also
capacitor rating.

• Keep inlet opening clear.

Switch fan into ‘on’ position in accordance with the switching

arrangement and local conditions. Check for:

•

Direction of fan rotation and airflow. The direction of rotation is

always indicated with an arrow on the top of the AstroFan FFU
housing.

• Check that the fan is running smoothly and in balance.

The AAF AstroFan FFU will require very little maintenance.

Due to the selection of bearings with lifetime lubrication (by using a

special lubricant), the FFU-fan does not require any maintenance.
Under normal operating conditions the lifetime lubrication will
provide a working life of 30-40,000 hours. After depletion of the
lubricant, the entire bearing needs to be replaced.

Access to the fan and motor is gained from the top by lifting the

FFU-housing from the HEPA/ULPA filter.

Periodic checks should be carried out on the filter resistance and
also on the air volume / air velocity. Lifetime of AstroCel II HEPA/
ULPA filter and RedPleat pre filter depend on local operating
conditions (velocity, working point, dust load and running hours)

and cannot easily be predicted.

RedPleat pre filter final resistance is 250 Pa maximum. However

AAF recommends a periodical check and replacement of the pre

filter at, for example, 100 Pa to ensure optimal energy efficiency of

the AstroFan FFU.

AstroCel II HEPA/ULPA final resistance depends on the available

free static pressure of the AstroFan FFU in the cleanroom arrange-

ment. Depending on operating conditions (velocity, filter class and
depth, working point, pre filter or other external static pressure
elements) a free static pressure of 80-100 Pa is available.

All maintenance work should be carried out with the highest regard

for safety. For access to the fan/motor the AstroFan FFU top plate
needs to be lifted from its position and removed before the fan/

motor arrangement can be reached.

• Ensure fan impeller is not moving.

• Ensure power supply is interrupted and provisions are taken to
avoid accidental closure of circuit.

• Ensure all working instructions are properly followed.

•

Always keep fan unobstructed. Regular cleaning helps to prevent

motor imbalance; use a cleaning brush where necessary.

•

Do not use high-pressure cleaners (water, steam, and air)

• Do not bend fan blades.