Step 14 - Check Belt Tension - Carrier WeatherExpert 48LC Installation Instructions Manual

Step 14 — Check Belt Tension
Measure the belt span length as shown in Fig. 66.
Calculate the required deflection by multiplying the belt
span length by 1/64. For example, if the belt span length
is 32 inches: 32 x 1/64 = 1/2 inch deflection.
Belt Force - - Deflection Method - -
Check the belt tension with a spring- - force belt force
deflection gauge.
1. Place a straightedge along the belt between the two
pulleys. Measure the distance between the motor shaft
and the blower shaft.
2. Set the tension gauge to the desired tension (see Table 1
in Fig. 66). Place the large O- - ring at that point.
3. Press the tension checker downward on the belt until
the large O- - ring is at the bottom of the straightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting plate
front bolts and rear bolt (see Fig. 67 on page 82) and
sliding the plate towards the fan (to reduce tension) or
away from the fan (to increase tension). Ensure the blower
shaft and motor shaft are parallel to each other (pulleys
aligned). Tighten all bolts securely when finished.
Fig. 66 - - V- - Belt Force Label
81
C160146