Trane AM4A0A30S21SA Series User Manual

108 CLCH-SVX07C-EN
Start-Up
Check unit vibration if the fan speed is changed more than five percent from the original designed
speed, or if parts such as shafts, fan wheels, bearings, or other drive components are replaced. Do
not exceed the maximum fan speed.
Pay particular attention to any vibration, noise, or overheating of the motor and fan bearings;
however, note that bearings may run warm during break in.
Figure 95. Proper drive alignment
Align Fan and Motor Sheaves
Align the fan and motor sheaves using a straightedge. The straightedge
must be long enough to span the distance between the outside edges of
the sheaves. When the sheaves are aligned, the straightedge will touch
both sheaves at points A through D (see Figure 95) to confirm the shaft
is parallel. For uneven width sheaves, place a string in the center groove
of both sheaves and pull tight. Adjust the sheaves and tighten the sheave
set screws to the proper torque given in Table 26.
Check Multiple Belts
Tighten the belts slightly and rotate the drive several times.
On multiple belt drives, ensure the force of deflection is approximately the
same on each belt by pushing each belt in an equal distance at a point
halfway from each sheave (see Figure 95). If this force is not the same for
each belt, the motor and fan shaft are not parallel. Realign as required.
After realignment, tighten the belts again to the standard belt tensioning
specifications. If the force is still not the same for all belts, the belts or
sheaves are worn and must be replaced.
D
Fixed
Sheave
C
B
A
Adjustable
Sheave
Straight
Edge
Lines must
be parallel
Center line
must coincide
Fixed
Sheave
Table 26. Fan and drive compound torque settings (inches)
Screw Size Hex Key Square Head Hex Head Torque (in.-lb.) Torque (ft.-lb.)
1/4 1/8 3/8 7/16 66-90 5.5-7.5
5/16 5/32 1/2 1/2 126-164 10.5-13.7
3/8 3/16 9/16 9/16 228-300 19.0-25.0
7/15 7/32 5/8 5/8 348-450 29.0-37.5
1/2 1/4 3/4 3/4 504-650 42.0-54.2
5/8 5/16 15/16 15/16 1290-1390 107.0-116.0
#10 3/32 - - 28-40 2.3-3.3

Trane AM4A0A30S21SA Series Specifications

General

Brand	Trane
Model	AM4A0A30S21SA Series
Category	Air Handlers
Language	English