data on the motor name plate. Set the motor protection
device to the nominal value.
- If used check the pressure switch and set the correct
pressure.
- Check the operation of the main switch.
- The warning label on rotating parts, electrical voltage
and opening doors are attached to the door. The label
to remove the transport brackets is located on the floor
of the fan section.
5.9 – Drive Package
The data for the belt type, belt tension, number of
belts, size and type of pulley is indicated on a label
attached to access door. Belt is not factory installed,
supplied loose for site installation.
5.9.1 – Alignment
Make sure that fan shafts and motor shafts are parallel
and level. The most common causes of misalignment
are nonparallel shafts and improperly located sheaves.
Where shafts are not parallel, belts on one side are
drawn tighter and pull more than their share of the
load. As a result, these belts wear out faster, requiring
the entire set to be replaced before it has given
maximum service. If misalignment is in the sheave,
belts enter and leave the grooves at an angle, causing
excessive belt and sheave wear.
5.9.1.1 Shaft Alignment:
Shaft alignment can be checked by measuring the
distance between the shafts at 3 or more locations. If
the distances are equal, then the shafts are parallel.
5.9.1.2 Sheave Alignment:
Fixed sheaves:
To check the location of the fixed
sheaves on the shafts, a straightedge or laser guide
device.
Straightedge must make contact at 4 distinct points
along the outside perimeter of both pulleys
Laser guide device
Adjustable sheaves
: To check the location of
adjustable sheave on shaft, make sure that the
centerlines of both sheaves are in line and parallel with
the bearing support channel. Adjustable pitch drives
are installed on the motor shaft. Carrier recommends
that adjustable sheaves should only be used for initial
balancing and be replaced with fixed pitch sheaves by
the air balancer prior to the final system air balance.
The air flow may cause stationary
parts to move (even a fan that is
switched off)
While working on the fan the switch
has to be locked open.
Do not exceed maximum fan speed with
adjustable sheave
Before opening doors, switch off and
de-energize the fan, and ensure that it
has stopped rotating. (Minimum of 2
minutes)
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