Daikin RPS - Page 89

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www.DaikinApplied.com 89 IM 893-10 • ROOFPAK SINGLEZONE UNITS
Table 19: Propeller Exhaust Fan Troubleshooting
Problem Cause Corrective Action
Reduced Airow
System resistance is too high.
• Check backdraft dampers for proper operation
• Remove obstructions in ductwork
• Clean dirty lters
• Check for adequate supply for air exhaust fans or
exhaust air for supply fans
Unit running backwards. See Prestarting Checks on page 87
Fan speed too low. Increase fan speed
Excessive dirt on propeller. Clean propeller
Excessive Noise
Bearings
• Tighten bearing collars and setscrews
• Lubricate bearings
• Replace defective bearings
V-Belt drive
• Tighten pulleys on motor shaft and fan shaft
• Adjust belt tension
• Align pulleys
• Replace worn belts or pulleys
Excessive vibration
• 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
Defective motor Replace motor.
Figure 95: Propeller Exhaust Fan Replacement Parts List
9
8
7
1 0
6
5
4
1
2
3
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 e ring
pl at
e
11