VFD Setup
Fans ordered with VFDs that were factory installed are setup
and tested prior to shipment. Prior to starting the fan(s), double
check the VFD settings according to the recommendations in
the VFD manual.
Once the correct VFD settings are veried, the fans should be
run through a sweep of the full range of operating speeds that
are expected to check for any vibration issues. If any areas
of concern are located, it is recommended to lock out those
frequencies using the VFD (see lock out frequencies or skip
frequencies in the VFD manual). This will ensure that the fans
will never operate continuously at those points, but will rather
pass through them to get to the desired points of operation.
Fan Startup
WARNING
ROTATING FAN
Can cause severe injury or death. Before servicing fans,lockout
and tag out power.
Start and run fan. See on page 30 for proper fan rotation.
Observe the rotation. If the fan operates backward, reverse two
legs of the three-phase supply power.
NOTE: Variable pitch fan drives usually are provided for
operation in the mid-speed adjustment range.
However, the drives usually ship with the adjustment
opened up for minimum fan speed. Adjust the drives
for the proper airow. See Fan Drive Adjustments on
page 38.
After 48 Hours of Operation
1. Disconnect and lock electrical power source.
2. Check tightness of all bearing, wheel, and sheave
setscrews (or capscrews). Refer to Table 13.
3. Recheck belt tension and adjust if necessary. Belts
tensioned sufciently to slip one to two seconds at
startup will perform satisfactorily, extending life and
reducing
Fan Wheel Alignment
Figure 42: Wheel-to-Inlet Funnel Relationship—
Fan Wheels (Housed)
Table 7: Wheel-to-Inlet Funnel Relationship—
Fan Wheels(Housed)
Airfoil
1
(in.)
Unit sizes 003 to 035 Unit sizes 040 to 090
Diameter A
2
(mm) B
3
(mm) Diameter A
2
(mm) B
3
(mm)
13.22 4.56 (116) 0.21 (5.33) 20.00 7.19 (183) 0.31 (7.87)
14.56 5.06 (129) 0.21 (5.33) 22.25 7.69 (195) 0.33 (8.38)
16.18 5.62 (143) 0.21 (5.33) 24.50 8.56 (217) 0.31 (7.87)
17.69 6.90 (175) 0.22 (5.59) 27.00 9.47 (241) 0.63 (16.00)
21.56 7.59 (193) 0.24 (6.10) 30.00 10.47 (266) 0.39 (9.91)
24.00 8.45 (215) 0.23 (5.84) 33.00 11.75 (298) 0.38 (9.65)
— — — 36.50 325 (12.78) 0.38 (9.65)
— — — 40.25 363 (14.31) 0.50 (12.70)
Note:
1
To obtain rated air performance, dimensional relationship must be held.
2
To obtain dimension A, loosen setscrews in wheel hub(s), shiftingwheel(s) axial as needed, retightening
setscrews.
3
To obtain dimension B, loosen screw and washer fasteners around periphery of funnel(s), shifting funnel radi-
ally as required, re-torquing fasteners.
Figure 43: Wheel-to-Inlet Funnel Relationship—
Forward Curved Fan Wheels
Figure 44: Wheel-to-Inlet Funnel Relationship—
Forward Curved Fan Wheels
Forward Curved
1
(in.)
Unit sizes 003 to 035 Unit sizes 040 to 090
Diameter C
2
(mm) Diameter C
2
(mm)
9×4 0.25 (6.35) 20 (Class 1 & 2) 0.24 (6.10)
9×7 0.13 (3.30) 22.38 (Class 1 & 2) 0.41 (10.41)
9×9 0.25 (6.35) 25 (Class 1 & 2) 0.47 (11.94)
10 0.22 (5.59) 27.62 (Class 1 & 2) 0.47 (11.94)
12 0.35 (8.89) 30 (Class 1 & 2) 0.47 (11.94)
15 0.44 (11.18) 33 (Class 1 & 2) 0.50 (12.70)
18 0.25 (6.35) 36 (Class 1 & 2) 0.75 (19.05)
20 (Class 1 & 2) 0.73 (8.54) — —
22½ (Class 1 & 2) 0.59 (14.99) — —
24½ (Class 1 & 2) 0.56 (14.22) — —
Note:
1
To obtain rated air performance, dimensional relationship must be vibration. If retensioning is necessary, be
certain to retain held.
2
Adjust dimension C by loosening wheel hub setscrews, shifting sheave alignment wheel(s) axial as needed,
and retightening setscrews.
operaTIon
www.DaikinApplied.com 29 IM 672-11 • VISION AIR HANDLING UNIT
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