Trane GXAA Installation, Operation And Maintenance Manual page 40

M M a a i i n n t t e e n n a a n n c c e e
N N o o t t e e : : Refer to Standard/High CFM Blower tables in the previous "Filters" section.
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B B l l o o w w e e r r R R P P M M A A d d j j u u s s t t m m e e n n t t
To adjust blower RPM:
1. Loosen and remove belt(s).
2. Match driver pulley to one found in
3. Loosen setscrew(s) marked A.
4. If driver pulley is equipped with external key, marked B, remove.
5. Adjust driver pulley pitch diameter for desired speed by opening (slower) or closing (faster)
6. If driver pulley is equipped with external key, marked B, replace.
7. Tighten setscrew(s) marked A.
8. Replace retension belt(s).
9. Realign drive if necessary.
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Standard CFM Blower belt tension can be adjusted by loosening motor mounting bolts
marked A. To tighten belt, slide motor down motor mounting bracket and re-fasten motor to
mounting bracket.
High CFM Blower belt(s) tension can be adjusted by first loosening motor mounting plate
bolts marked A. To tighten belt tension, turn belt tension adjustment screws marked B
counter-clockwise. To loosen belt tension, turn clockwise. Once belt tension has been
adjusted, re-fasten motor mounting plate bolts.
moving parts by half or full turns. Do not open sheave past point where flange projects past
the hub end.
Figure 24, p. 40.
Figure 24. Blower RPM Adjustment
MUA-SVX006B-EN