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64
Step 13 — Check Belt Tension
Measure the belt span length as shown in Fig. 81.
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. 81). 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. 82) and slide 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.
C160146
Fig. 81 -- V--Belt Force Label
Summary of Contents for 50TCQD
Page 5: ...5 C14192 Fig 2 Unit Dimensional Drawing 14 Size Unit ...
Page 6: ...6 C14193 Fig 2 Unit Dimensional Drawing 14 Size Unit cont ...
Page 10: ...10 C10365 Fig 6 Roof Curb Details ...
Page 17: ...17 a50 9707 Fig 26 Typical 50TCQ Control Wiring Diagram ...
Page 18: ...18 a50 9708 Fig 27 Typical 50TCQ Power Wiring Diagram 208 230V 3 Phase 60Hz unit shown ...
Page 43: ...43 a50 9710 Fig 50 PremierLinkt Controller Wiring Schematic ...
Page 51: ...51 a50 9711 Fig 66 RTU Open Controller System Wiring Diagram ...