During commissioning ensure that the following values
are not exceeded:
Maximum fan speed
Minimum fan speed
Motor rating
Do not change the clearance between the rotor and the
bellmouth inlet.
Pressure measuring devices
Fig. 66: Pressure measurement point
1
Bellmouth inlet
2
Partitioning panel
M1 Pressure measurement point in the fan chamber
M2 Pressure measurement point on the bellmouth inlet
M3 Pressure measurement point in front of the parti-
tioning panel
The fans may be factory fitted with pressure measuring
devices (optional). The following pressure values are
measured at the pressure measurement point
(Fig. 66/M2) in the bellmouth inlet (Fig. 66/1), the pres-
sure measurement point (Fig. 66/M1) in the fan
chamber, and the pressure measurement point
(Fig. 66/M3) in front of the partitioning panel.
Pressure
Determined from
Static fan pressure
increase
Differential pressure
between M1 and M3
Effective pressure (
D
p
w
) of
the fan
The differential pressure
between M2 and M3 is
used to calculate the
volume flow rate.
Calculation of the volume flow rate
The K value is given on the TROX fan rating plate on
the air handling unit.
This value may be different from the K value on the
rating plate from the fan manufacturer (which should not
be used for the calculation).
Set up the centrifugal fan
WARNING!
Risk of injury from the incorrect handling and
operation of fans!
Incorrect handling, e.g. reaching into rotating parts,
can lead to serious injuries.
–
Do not reach into the moving fan or tamper with
it.
–
The fan does not stop immediately! Check that
no parts are moving before you open an inspec-
tion access door.
–
Do not put a damaged or defective fan into oper-
ation.
–
Do not exceed a fan's maximum capacity, e.g.
when there are strong vibrations or against a
closed multileaf damper.
–
Switch off the AHU before you start working on
movable fan parts and secure it against acciden-
tally being switched on again. Wait until all parts
have come to a standstill.
WARNING!
Risk of fire from damaged fan parts!
Grinding rotors or overheating bearings can cause a
fire and eventually serious or even fatal injuries.
–
Do not put a damaged or defective fan into oper-
ation.
–
The power consumption must not exceed the
specified nominal current.
–
Make sure that the maximum motor speed is not
exceeded.
Personnel:
Skilled qualified electrician
Protective equipment:
Protective clothing
Hearing protection
Industrial safety helmet
Protective gloves
Safety shoes
1.
Remove the red transport protection devices from
the fan.
2.
Check the fan for shipping damage, imbalance,
corrosion and contamination.
3.
Check ducts and fan for foreign matter.
Initial commissioning
Setting up and adjusting AHU casing units > Centrifugal fan
Air handling unit X-CUBE
57
