Daikin Vision Installation And Maintenance Manual page 25

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 verified, 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
Start and run fan. See Figure 43
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 airflow.
page 42.
After the First 48 Hours of Operation:
1 Disconnect and lock electrical power source.
2 Check tightness of all bearing, wheel, and sheave setscrews
(or capscrews). See Table 12.
3 Recheck belt tension and adjust if necessary, retaining
sheave alignment. Belts tensioned sufficiently to slip one to two
seconds at startup will perform satisfactorily, extending life and
reducing vibration.
www.DaikinApplied.com
for proper fan rotation.
See Fan Drive Adjustments on
Fan Wheel Alignment
Figure 39: Wheel-to-Inlet Funnel Relationship—Airfoil
TypeFan Wheels (Housed)
A
Table 5: Wheel-to-Inlet Funnel Relationship—Airfoil Type
Diameter
(in .)
20.00
22.25
24.50
27.00
30.00
33.00
36.50
40.25
44.50
49.00
Note: 1. To obtain rated air performance, dimensional relationship must be held.
Note: 2. To obtain dimension A, loosen setscrews in wheel hub(s), shifting wheel(s) axially
as needed, retightening setscrews.
Note: 3. To obtain dimension B, loosen screw and washer fasteners around periphery of
funnel(s), shifting funnel radially as required, re-torquing fasteners.
Figure 40: Wheel-to-Inlet Funnel Relationship—Forward
Curved Type Fan Wheels
C
I n l e t
F u n n e l
Table 6: Wheel-to-Inlet Funnel Relationship—Forward
Curved Type Fan Wheels
Diameter
(in .)
20 (Class 1 & 2)
22.38 (Class 1 & 2)
25 (Class 1 & 2)
27.62 (Class 1 & 2)
30 (Class 1 & 2)
33 (Class 1 & 2)
36 (Class 1 & 2)
Note: 1. To obtain rated air performance, dimensional relationship must beheld.
— Adjust dimension C by loosening wheel hub setscrews, shifting wheel(s) axially as
needed, and retightening setscrews.
25
Operation Guidelines
E q u a l s p a c i n g
B
a l l a r o u n d
A
A
in . (mm)
7.19 (183) 0.31 (7.87)
7.69 (195) 0.33 (8.38)
8.56 (217) 0.31 (7.87)
9.47 (241) 0.63 (16.0)
10.47 (266) 0.39 (9.91)
11.75 (298) 0.38 (9.65)
12.78 (325) 0.38 (9.65)
14.31 (363) 0.5 (12.7)
15.65 (398) 0.56 (14.22)
17.44 (443) 0.61 (15.49)
W h e e l
C
in . (mm)
0.24 (6.10)
0.41 (10.41)
0.47 (11.94)
0.47 (11.94)
0.47 (11.94)
0.50 (12.70)
0.75 (19.05)
IM 915-13 • VISION - EXTENDED SIZES
B
in . (mm)
C
I n l e t
F u n n e l