Checks At Centrifugal Fans - Carrier 50HB Manual

Horizontal package air conditionners
Position of the electric panel in the units
Electric
panel
Power supply inputs
These units can incorporate an auxiliary electric panel for optional
components such as: transformer for power supply without neutral,
transformer for damper of condensation pressure control and differential
pressostats for dirty fi lters and control of air fl ow.
Auxiliary
electric
panel
Damper Pressostat for
transformer dirty fi lters

Checks at centrifugal fans

Pressostat for Transformer for power
fl ow control supply without neutral
- Before commissioning, check the blade rotation direction and that
the axis turns without strokes nor vibrations
- Once running, check the operation conditions:
• pressures,
• fl ows,
• consumptions.
- The coupling of characteristic bends of the fan and the room is
very important, so that the fl ows and pressures provided to the duct
network are as required.
Pulley and belt adjustment
Both for the indoor circuit motorfans as well as the outdoor circuit are
coupled by pulleys and belts.
In this type of fans, the following must be taken into considerations:
- The pulleys must be on the same plane, so it is important to check
them with the help of a ruler or a laser aligner.
- In case they are not aligned, remove the pulley screws, and after
removing the taper pin, the set of pulley and taper can be slided over
the axis (this action can be performed both in the motor as well as
in the fan).
- After fi xing the pulleys on the same plane, the belt tension is made
by tightening the tensor screw.
- The belt tension must be checked after 24 hours of motor operation.
Attention: Before performing these operations, it is necessary to verify
that the unit is disconnected from mains.
Pulleys must stay on the same plane
Tensor
screw
Pulley
screws
Taper pin
9