Daikin RDT Installation And Maintenance Manual page 89

Table 19: Propeller Exhaust Fan Troubleshooting
Problem
Reduced Airflow
Excessive Noise
Figure 95: Propeller Exhaust Fan Replacement Parts List
9
11
www.DaikinApplied.com
Cause
System resistance is too high.
Unit running backwards.
Fan speed too low.
Excessive dirt on propeller.
Bearings
V-Belt drive
Excessive vibration
Defective motor
1
2
8
7
1 0
4
3
6
5
Corrective Action
• Check backdraft dampers for proper operation
• Remove obstructions in ductwork
• Clean dirty filters
• Check for adequate supply for air exhaust fans or
See Prestarting Checks on page 87
Increase fan speed
Clean propeller
• Tighten bearing collars and setscrews
• Lubricate bearings
• Replace defective bearings
• Tighten pulleys on motor shaft and fan shaft
• Adjust belt tension
• Align pulleys
• Replace worn belts or pulleys
• Clean dirt build-up from propeller
• Check all setscrews and fasteners for tightness
• Check for worn bearing
• Correct propeller imbalance
• Check for loose dampers, guards or ductwork
Replace motor.
89 IM 893-10 • ROOFPAK SINGLEZONE UNITS
u
exhaust air for supply fans
1. F an pa n e l
2. P rop e l l er
3. D rive fr ame
ch a n n e l ( 2)
4. M oto r pl ate
5. M oto r
6. M oto r pu lley
7. S h a ft pu l l ey
8. F an sh aft
9. B e a rin g s
10. B elt
11. B a
o
nIT PTIons
e ring pl ate