24
3064058_201610
AHU TE
AHUW TE
- +
Pw
Commissioning
As required by DIN/EN 1886, tools are necessary for opening the unit. Always wait for
the fan to run down to a complete standstill before opening inspection doors. The partial
vacuum inside the unit could draw in loose or slack parts when the door is opened,
which could cause severe damage to the fan. Severe or fatal injury could result if the
vacuum sucks items of clothing inside.
Ensure that safety devices such as belt and door screens and all monitoring devices
are correctly installed and in full working order.
Fan section
- Check the security of the vee-belt pulleys and the clamping screws of the clamping
bush.
Adjustable belt pulleys are not set up before shipment and must be correctly adjusted
on site prior to commissioning the air-handling unit.
They permit a 10% variation in fan speed.
Setting:
Pulley diameter can be changed by altering the position of the adjustable pulley plate
axially on a threaded adaptor (see the adjacent diagram). To adjust the pulley plate,
relieve the tension on the vee-belt and undo the locking screws on the adjustable
pulley with an Allen key. After adjusting the pulley plate, it is very important to tighten
the locking screws correctly and to readjust the vee-belt to the correct tension.
- Check that the vee-belt is correctly tensioned.
The vee-belt pulleys must be in perfect alignment.
If required, adjust the air flow by changing the belt pulleys (or by pulley adjustment if
the unit is fitted with adjustable pulley(s)).
Note
Fixing screws for vee-belt pulley
Locking screw
Adjustable pulley plate
- Only commission the appliance if the ducts are connected and the inspection doors
are closed. Failure to comply with this requirement will give rise to the risk of motor
overload.
- Switch on the main isolator.
- Briefly start the drive motor and check the fan impeller direction of rotation. Correct
the direction of rotation if necessary.
Proceed with extreme caution at all times as the door of the fan section must be open
for these operations (if there is no sight glass). Loose or slack parts can be drawn in,
which could cause severe damage to the fan. Severe or fatal injury could result if the
vacuum sucks items of clothing (a necktie, for example) inside.
The airstream on the downstream side of the fan could slam an inspection door open
and cause injury if the fan is installed on the pressure side.
- The fan is to be checked for mechanical vibrations.
If the vibration severity is larger than 2.8 mm/s (measured on the bearing plate of the
bearing at the impeller end of the motor), the motor/impeller unit must be examined
by technical personnel and rebalanced if necessary.
Commissioning may take place only if all safety instructions (BS EN 50110, IEC 364)
have been checked and an endangerment is ruled out.
The resonance range of the impeller is to be determined. If the range of resonance
lies within the operating range, then the frequency converter is to be adjusted such
that the range of resonance is driven through quickly.
Strong vibrations caused by irregular running (imbalance, over modulation of frequency
converter), e.g. due to transport damage, inappropriate handling or operation within
the resonance range, can lead to failure.
If the fan impeller is of the free running type, ensure that the maximum speed stated on
the fan type plate is never exceeded even if the unit operates with an inverter. Ensure
that the rated motor current consumption is not exceeded.
