Carrier 50UA-UH 135 - Application Data: Airflow and Fan Adjustment; Air Flow Limits; Indoor Fan Air Flow Adjustment

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135 5456 8184
ʾ˃ʽ 5736 8604
ʾ˅ʽ 7264 10896
205 7336 11004
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The drive is factory set in accordance with the standard fan
performance tables.
7HENINDOORPRESSUREANDAIRmOWREQUIREMENTSDIFFERFROM
nominal ratings, the motor pulley can be adjusted for diffe-
rent available static pressure values (see fan performance
tables).
To change the fan speed:
1. Move the motor along its track in order to remove the
belt.
2. Loosen the pulley setscrews and rotate as necessary.
3. Tighten the setscrews.
4. Replace the belt(s) in the channel of the pulley.
5. Tighten the belt(s), using the tension screw nut and
washer. See maintenance section and
Fig. 11.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews. Slide fan pulley along the
pulley shaft and align with the motor using a ruler,
making sure that it is parallel to the belt.
2. Tighten the fan pulley setscrews.
To adjust the belt tension, loosen the motor mounting
plate bolts and slide the motor mounting plate until the
belts are tensioned as shown in Fig. 9. Please refer to
chapter 7.1 for the belt tension.
Fan and motor pulleys can be aligned as shown in
Fig. 12.
If the unit is equipped with adjustable pulleys, the pulley
ratio and operating point can be adjusted by loosening the
setscrew, arranging the moving part of the pulley to the
APPROPRIATEPOSITIONANDTHENlXINGTHESETSCREW
See fan performance tables for adjustments.
UA-UH 135-205 standard - HS1
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ƕ Drive HS1 is for units with high static pressure
1 Fan pulley
2 Fan scroll
3 Belt
4 Motor
5 Setscrew
6 Motor pulley
7 Motor plate
8 Tensioning screw
25
30