Maintenance; Fan Belt Adjustment - Trane TSC060 Installation Operation & Maintenance

T_C-IOM-2A

Maintenance

ROTATING PARTS!
UNIT STARTS AUTOMATICALLY
Make sure all personnel are standing clear
of the unit before proceeding. The
system components will start when the
power is applied.

Fan Belt Adjustment

The fan belts must be inspected periodi-
cally to assure proper unit operation.
Replacement is necessary if the belts
appear frayed or worn. Units with dual
belts require a matched set of belts to
ensure equal belt length.
When removing or installing the new
belts, do not stretch them over the
sheaves. Loosen the belts using the belt
tension adjustment bolts on the motor
mounting base.
Once the new belts are installed, using a
Browning or Gates tension gauge (or
equivalent) illustrated in Figure 7; adjust
the belt tension as follows;
1. To determine the appropriate belt de-
flection;
a. Measure the center-to-center shaft
distance in inches or millimeters
between the fan and motor
sheaves.
b. Divide the distance measured in
Step 1a by 64 inches or 152
millimeters; the resulting value
represents the amount of belt
deflection that corresponds to the
proper belt tension.
2. Set the large O-ring on the belt ten-
sion gauge at the deflection value de-
termined in Step 1b.
3. Set the small O-ring at zero on the
force scale of the gauge plunger.
4. Place the large end of the gauge at the
center of the belt span; then depress
the gauge plunger until the large O-
ring is even with the top of the next
belt or even with a straightedge
placed across the fan and motor
sheaves. Refer to Figure 9.
5. Remove the belt tension gauge. The
small O-ring now indicates a number
other than zero on the plunger's force
scale. This number represents the
force in pounds or newtons required
to give the needed deflection.
6. Compare the "force" scale reading
(Step 5) with the appropriate "force"
value listed in Table 7. If the "force"
reading is outside the range, readjust
the belt tension.
Note:
Actual belt deflection "force" must not
exceed the maximum "force" value
shown in Table 7.
7. Recheck the belt tension at least twice
during the first 2 to 3 days of opera-
tion. Belt tension may decrease until
the new belts are "run in".
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